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CN114458171A - Casing, well strengthening completion pipe string, well completion and well cementation method and application - Google Patents

Casing, well strengthening completion pipe string, well completion and well cementation method and application Download PDF

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Publication number
CN114458171A
CN114458171A CN202011132644.8A CN202011132644A CN114458171A CN 114458171 A CN114458171 A CN 114458171A CN 202011132644 A CN202011132644 A CN 202011132644A CN 114458171 A CN114458171 A CN 114458171A
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CN
China
Prior art keywords
gas
well
weight
pipe
completion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011132644.8A
Other languages
Chinese (zh)
Inventor
段友智
秦星
刘欢乐
艾爽
岳慧
侯倩
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
Original Assignee
China Petroleum and Chemical Corp
Sinopec Research Institute of Petroleum Engineering
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Petroleum and Chemical Corp, Sinopec Research Institute of Petroleum Engineering filed Critical China Petroleum and Chemical Corp
Priority to CN202011132644.8A priority Critical patent/CN114458171A/en
Publication of CN114458171A publication Critical patent/CN114458171A/en
Pending legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D23/00—Producing tubular articles
    • B29D23/001—Pipes; Pipe joints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/30—Low-molecular-weight compounds
    • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
    • C08G18/3855—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur
    • C08G18/3863—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms
    • C08G18/3865—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms containing groups having one sulfur atom between two carbon atoms
    • C08G18/3868—Low-molecular-weight compounds having heteroatoms other than oxygen having sulfur containing groups having sulfur atoms between two carbon atoms, the sulfur atoms being directly linked to carbon atoms or other sulfur atoms containing groups having one sulfur atom between two carbon atoms the sulfur atom belonging to a sulfide group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4018—Mixtures of compounds of group C08G18/42 with compounds of group C08G18/48
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4202—Two or more polyesters of different physical or chemical nature
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4236—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups
    • C08G18/4238—Polycondensates having carboxylic or carbonic ester groups in the main chain containing only aliphatic groups derived from dicarboxylic acids and dialcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6614—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38
    • C08G18/6618—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3225 or C08G18/3271 and/or polyamines of C08G18/38 with compounds of group C08G18/3225 or polyamines of C08G18/38
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6633—Compounds of group C08G18/42
    • C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/10—Setting of casings, screens, liners or the like in wells
    • E21B43/103—Setting of casings, screens, liners or the like in wells of expandable casings, screens, liners, or the like

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Polyurethanes Or Polyureas (AREA)

Abstract

The invention discloses a casing, a well strengthening and well completing pipe column, a well completing and well cementing method and application. The sleeve comprises an inner base pipe and an expandable outer pipe sleeved outside the inner base pipe; the inner base pipe is made of a soluble polyurethane elastic material, and the expandable outer pipe is made of a shape memory material; the outer diameter of the inner base pipe is 50-250 mm, the inner diameter of the expandable outer pipe is larger than 50mm to larger than 250mm, and the outer diameter of the expandable outer pipe is 60-300 mm. According to the casing provided by the invention, the expandable outer pipe can be expanded and tightly attached to the inner wall of a well hole, positive extrusion force is generated on the well wall, the stratum shearing effect is reduced, the problem of well wall stability is solved, meanwhile, the inner drift diameter can be expanded by 20-100%, and after the inner base pipe is dissolved or extracted, the subsequent secondary operation is convenient.

Description

Casing, well strengthening completion pipe string, well completion and well cementation method and application
Technical Field
The invention relates to a casing, a well strengthening and well completing pipe column, a well completing and well cementing method and application.
Background
In well drilling and completion projects, the problem of well wall stability is a complex problem often encountered. The instability of the well wall not only affects the drilling speed, the well cementation quality and the like, but also causes the collapse and the block falling of partial well sections, thereby causing accidents such as drill jamming, blockage and the like. During the production phase of the well completion, the induced collapse of the well wall caused by acid fracturing will cause the well wall to be out of position, thereby directly affecting the subsequent production operation. Meanwhile, the sand production of the oil well can increase the workload and reduce the service life of equipment.
The anti-collapse well completion process is one of the main methods for solving the problem of well wall stability. One of them is a mechanical anti-collapse method, which uses various conventional pipe columns, such as perforated oil pipe, slotted liner pipe, wire-wrapped screen pipe, etc., to provide a certain flow space for the downhole fluid. The other method is to put an expandable screen pipe, and to expand and seal the screen pipe from bottom to top through a special expansion and sealing tool in the well, so as to achieve the function of supporting the well wall. However, the sealing tool does not have a certain thickness after sealing, and the sealing effect of the whole collapse layer section needs to be further improved. Yet another method is to modify the drilling fluid by both physical and chemical means. Physical measures include, among others, increasing drilling fluid density, viscosity to mitigate pressure and diffusion effects, to reduce pressure agitation. Chemical means include adding chemicals to the drilling fluid to reduce water penetration of the shale, inhibit formation hydration dispersion, or aid in the rapid formation of a dense and tough mud cake.
At present, people develop a plurality of drilling fluid formulas aiming at different geological conditions and drilling processes, but the drilling fluid has the following defects: (1) the stability effect of the drilling fluid on the well wall is not easy to control through the liquid column pressure of the drilling fluid and the formation of mud cakes, and the stability is poor. (2) The drilling fluid needs to be prepared according to different stratums, the adaptability is poor, and a plurality of stratums do not have proper drilling fluid. (3) For the water-based drilling fluid, mudstone absorbs water and expands to cause the shrinkage of a well bore, conglomerate and volcanic rock cross-collapse when meeting water, salt rock forms a karst cave when meeting water, and the like, so that drilling jamming and other adverse effects are caused, and even the well bore is scrapped. (4) Drilling fluids often contain crude oil, diesel oil, and various oils, as well as a large number of chemical treatments, which can have adverse effects on the formation, soil, environment, and ecology.
CN101362938 discloses a well wall stabilizer for drilling, which is mainly used for solving the technical problems of reservoir damage caused by unstable well wall and clay expansion in the well completion process. The stabilizer is formed by the mud cakes of the well wall participating in the rock stratum to block the pores, so that the well wall has flexibility and scalability, the lubrication coefficient of the mud cakes can be obviously reduced, and the effect of stabilizing the well wall is achieved.
CN103013482A discloses a composite borehole wall stabilizer which takes potassium trimethylsilanolate powder and nanmu powder as mutually synergistic main components and takes paraffin and graphite as auxiliary components, and when the stabilizer is used in water-based mud (including brine mud), the stabilizer can effectively inhibit hydration and expansion of shale, improve the quality of mud cakes, enable the mud cakes to be compact, tough and lubricated and further stabilize the borehole wall of a shale stratum. Meanwhile, the composite borehole wall stabilizer also has a plugging effect on a stratum with micro-crack development, so that the stratum is not easy to collapse and is stable, and the borehole wall is protected.
CN104405371A discloses a method for increasing the stability of well wall and reducing the fluid loss, which simulates the deposition of biomineral in the well wall stabilizing technology of drilling fluid, and rapidly forms an organic/inorganic composite film with compact structure and excellent mechanical property on the well wall through layer-by-layer deposition, so as to change the microstructure and mechanical property of mud cake or the deposited layer around the well wall, stabilize and harden the well wall, thereby improving the stability and pressure-bearing capability of the well wall, and simultaneously reduce the fluid loss and prevent the invasion of drilling fluid.
CN102224321A discloses shape memory polyurethane foam for downhole sand control filtration devices. It uses polycarbonate type shape memory polyurethane, compresses the foam by the mould above the glass transition temperature; cooling to room temperature, and shaping into high-density small-volume foam; and (4) conveying the foam to a downhole design position, and heating the foam to be above the glass transition temperature to expand the foam to be used as the sand filtering foam of the oil well. In the material synthesis process, the material is endowed with the thermotropic shape memory function by controlling the glass transition temperature of the soft section of the foam material, so that the foam volume memory is realized. The shape-memory polyurethane foam provided by the invention has the following problems in the using process: the hollow cylinder formed by the shape memory polyurethane foam has low compressive strength and can be used for sand filtration at the well bottom, but the generated radial extrusion strength of the well wall is insufficient, so that the hollow cylinder is inconvenient to be directly used for strengthening a well hole, and the inner drift diameter is smaller after the hollow cylinder is put into the well bottom for expansion, so that the secondary operation is inconvenient.
US8664318a1 discloses a shape memory structure comprising an elastic material mixed together with a viscoelastic material. The shape memory structure is configured to have a smaller volume when in the first shape than when in the second shape to facilitate well entry. The shape memory structure may be re-recoverable from the first shape to the second shape upon exposure to an environmental change that softens the viscoelastic material, thereby allowing the stress stored in the elastic body of the shape memory structure to be gradually released, effecting a volumetric change. The technical scheme of the invention also has the problems of low strength and easy damage of the shape memory structure. Moreover, the excessive thickness of the elastic material also easily affects the flow efficiency, i.e. the fluid flows through unnecessary filtering paths, which increases the energy consumption.
CN105626002A discloses a no-fill expandable screen, which comprises an expandable base pipe, a filtering screen outside the expandable base pipe, and an expansion body outside the filtering screen. The expansion body comprises a shape memory polymer layer coated outside the filtering screen pipe and a water-soluble polymer layer integrally coated outside the shape memory polymer layer. Two ends of the filter screen pipe are fixed on the expansion base pipe through a first positioning ring. The two ends of the shape memory polymer layer are fixed on the filtering sieve pipe through a second positioning ring. The two ends of the expansion base pipe are respectively provided with an expansion base pipe extension section protruding out of the first positioning ring. The technical scheme of the invention is similar to the aspects of the structure design, the material of the outer expansion body and the like of the above US8664318A1, and the problems of small inner diameter after expansion and inconvenience for secondary operation exist.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a casing, a well strengthening completion string, a well completion and cementing method and application. The casing pipe provided by the invention comprises an inner base pipe and an expandable outer pipe sleeved outside the inner base pipe, wherein the inner base pipe is made of a soluble polyurethane elastic material, the hydrolysis speed of the inner base pipe is controllable, the expandable outer pipe is made of a shape memory material and can be compressed or expanded at a proper temperature, when the expandable outer pipe is used in the well completion and well cementation process, the problem of well wall stability can be solved, the inner drift diameter of the outer pipe can be expanded, and the subsequent secondary operation is convenient.
The invention provides a casing pipe in a first aspect, which comprises an inner base pipe and an expandable outer pipe sleeved outside the inner base pipe; the inner base pipe is made of a soluble polyurethane elastic material, and the expandable outer pipe is made of a shape memory material; the outer diameter of the inner base pipe is 50-250 mm, the inner diameter of the expandable outer pipe is larger than 50-250 mm, and the outer diameter of the expandable outer pipe is 60-300 mm. Preferably, the outer diameter of the expandable outer tube is 60-260 mm.
According to some embodiments of the bushing of the present invention, the compression temperature for compressing the inner diameter of the expandable outer tube to 50 to 250mm is 70 to 180 ℃, preferably 100 to 180 ℃, more preferably 120 to 180 ℃. Wherein, after the expandable outer tube is compressed, the compressed expandable outer tube can be shaped at the temperature of less than or equal to 50 ℃.
According to some embodiments of the casing of the present invention, the expandable outer tube is expanded to an inner diameter of 60 to 260mm at an expansion temperature of 45 to 120 ℃, preferably, the expandable outer tube is expanded to an outer diameter of 100 to 350mm, preferably, at an expansion temperature of 100 to 120 ℃.
In various embodiments of the present invention, the inner basepipe of the casing may or may not be fixedly attached to the outer expandable tubular.
For the expandable outer tube provided by the invention, when the components are different, the expansion temperature and the compression temperature are selected differently, and the expansion temperature is increased along with the increase of the compression temperature and is reduced along with the decrease of the compression temperature.
According to some embodiments of the bushing of the present invention, the soluble polyurethane elastomer material is prepared from a starting material comprising a prepolymer component and a polyol component.
According to some embodiments of the bushing of the present invention, the raw material for preparing the prepolymer component includes 20 to 65 wt% of polyisocyanate and 35 to 80 wt% of first polyester polyol.
According to a preferred embodiment of the bushing of the present invention, the content of isocyanate in the prepolymer component is 5 to 20 wt%.
According to some embodiments of the bushing of the present invention, the polyol component includes 70 to 100 parts by weight of the second polyester polyol, 4 to 10 parts by weight of the chain extender, 0.5 to 2 parts by weight of the catalyst, and 1 to 25.5 parts by weight of the hydrophilic agent.
According to some embodiments of the bushing of the present invention, the weight ratio of the pre-polymer component and the polyol component is 30:100 to 90: 100.
According to some embodiments of the bushing of the present invention, the soluble polyurethane elastic material has a tensile strength of 5 to 30 MPa.
According to some embodiments of the cannula according to the invention, the soluble polyurethane elastomer material has a Shore A (Shore A) hardness of 40-90.
According to some embodiments of the bushing of the present invention, the polyisocyanate is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate (MDI, liquefied modified MDI) and polyphenylmethane polyisocyanate (PAPI).
According to a preferred embodiment of the cannula according to the present invention, the toluene diisocyanate is selected from at least one of TDI-65/35, TDI-80/20 and TDI-100.
According to some embodiments of the bushing of the present invention, the first polyester polyol and the second polyester polyol are each independently an adipic acid-based polyester polyol and/or a castor oil polyester polyol.
According to a preferred embodiment of the bushing according to the invention, the polymerized monomers of the adipic acid-based polyester polyol comprise adipic acid and alcohols.
According to some embodiments of the cannula of the present invention, the alcohol is at least one of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, methyl propylene glycol and diethylene glycol.
According to a preferred embodiment of the bushing of the present invention, the adipic acid-based polyester polyol is at least one of polyethylene glycol adipate glycol (PEA) having a number average molecular weight of 2000 to 4000, polybutylene adipate glycol (PBA) having a number average molecular weight of 2000 to 4000, neopentyl glycol adipate glycol (PNA) having a number average molecular weight of 1000 to 5000, polyethylene glycol adipate glycol butanediol glycol (PEBA) having a number average molecular weight of 1000 to 5000, and polyethylene glycol neopentyl glycol adipate glycol (PENA) having a number average molecular weight of 1000 to 5000.
According to a specific embodiment of the bushing of the present invention, the adipic acid-based polyester polyol is at least one of polyethylene adipate glycol having a number average molecular weight of 2000, polyethylene adipate glycol having a number average molecular weight of 4000, polybutylene adipate glycol having a number average molecular weight of 2000, polybutylene adipate glycol having a number average molecular weight of 4000, neopentyl glycol adipate glycol having a number average molecular weight of 4000, polyethylene glycol adipate glycol butanediol having a number average molecular weight of 4000, and polyethylene glycol adipate neopentyl glycol ester glycol having a number average molecular weight of 4000.
The specific type of the polyester polyol used in the invention is not limited, and preferably, the polyester polyol used in the invention is prepared by laboratories, and adipic acid, ethylene glycol and 1, 4-butanediol in different proportions are adopted to perform polycondensation according to different required number average molecular weights. In the present invention, the polycondensation reaction is not limited to the conditions, and the reaction may be carried out under the conventional process conditions. Of course, commercially available polyester polyols of different molecular weights can also be used.
According to some embodiments of the bushing of the present invention, the chain extender is an aliphatic chain extender and/or an aromatic chain extender.
According to a preferred embodiment of the bushing according to the invention, the chain extender is selected from at least one of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA), diaminodimethylmethylthiotoluene (DMTDA), Ethylene Glycol (EG), 1, 4-Butanediol (BDO), diethylene glycol (DEG), Trimethylolpropane (TMP), Triethanolamine (TGA) and Diethanolamine (DEOA).
According to some embodiments of the cannula of the invention, the catalyst is a tertiary amine based catalyst and/or an organometallic catalyst.
According to a preferred embodiment of the ferrule of the present invention, the tertiary amine catalyst is selected from at least one of triethylenediamine (a-33), Tetramethylethylenediamine (TMEDA), and Dimethylcyclohexylamine (DMCHA).
According to a preferred embodiment of the bushing according to the invention, the organometallic catalyst is selected from at least one of dibutyltin dilaurate (DBTDL), stannous octoate, potassium isooctanoate, potassium acetate, potassium oleate, phenylmercuric acetate and zinc isooctanoate.
According to some embodiments of the cannula of the invention, the hydrophilic agent is polyethylene glycol and/or a water absorbent resin.
According to some embodiments of the bushing of the present invention, when the hydrophilic agent is polyethylene glycol, the content of the polyethylene glycol is 6 to 23.5 parts by weight.
According to some embodiments of the bushing of the present invention, when the hydrophilic agent is a water absorbent resin, the water absorbent resin is contained in an amount of 1 to 2 parts by weight. The super absorbent resin is preferable in the present invention, and the type of the super absorbent resin used is not limited.
According to some embodiments of the cannula of the present invention, the shape memory material is prepared by mixing and foaming polyurethane and hot melt adhesive. In different embodiments of the invention, the shape memory material is prepared by mixing and foaming polyurethane and hot melt adhesive by a rolling or rolling method. Specifically, polyurethane foam and hot melt adhesive are mixed and rolled or rolled in a fixed die according to a required weight ratio, compressed into a polygonal hollow cylinder through multi-petal type shaping equipment, and cooled to enable the hot melt to be in a gel fixed type, so that the expandable outer tube is formed.
According to some embodiments of the bushing of the present invention, the hot melt adhesive is selected from at least one of styrene-isoprene-styrene copolymer hot melt adhesives, polyurethane hot melt adhesives, ethylene-vinyl acetate copolymer hot melt adhesives, waterborne polyurethane hot melt adhesives, nylon, and reactive polyurethane hot melt adhesives.
According to some embodiments of the bushing of the present invention, the weight ratio of the polyurethane to the hot melt adhesive is: 30% -80%: 20 to 70 percent.
The polyethylene glycol has good hydrophilicity, and after a proper amount of polyethylene glycol is added into the polyol component, the polyol component reacts with the prepolymer component, so that the hydrophilicity degree of the obtained soluble polyurethane elastic material can be increased, and the hydrolysis rate is accelerated. The water-absorbing resin (SAP) does not participate in the reaction process, and can play a role in increasing the hydrophilic degree of the soluble polyurethane elastic material so as to adjust the hydrolysis rate of the soluble polyurethane elastic material.
For the synthesis of polyester polyols for soluble polyurethane elastomers, the ester group content as well as the pendant group content of the polyester polyol backbone can affect the hydrolysis rate of the polyurethane elastomer. Specifically, the higher the ester group content on the polyester polyol molecular main chain, the lower the side group content, and the faster the hydrolysis rate of the prepared soluble polyurethane elastic material. Therefore, the ester group content and the side group density of the polyester polyol molecular main chain can be adjusted by adjusting the molecular weight and the structure of the dihydric alcohol, and the hydrolysis rate is further adjusted, so that the hydrolysis rate of the soluble polyurethane elastic material obtained by the invention is controllable.
In the sleeve provided by the invention, the density of the expandable outer tube is preferably 0.035-0.65 g/cm3The 50% compressive strength is preferably 1 to 5.4 MPa. Furthermore, the volume compression ratio of the expandable outer pipe is preferably 15-4000, the volume expansion ratio is preferably 7.5-3500, and the volume recovery ratio is preferably 50-100.
According to the casing provided by the invention, the outer expandable outer pipe of the outer layer is made of the shape memory material, can be compressed or expanded at a proper temperature, can be expanded and tightly attached to the inner wall of a borehole when being put into the borehole, generates positive extrusion force on the borehole wall to stabilize the stratum, reduces the stratum shearing effect, solves the problem of borehole wall stability, can expand the inner drift diameter by 20-100%, and is convenient for subsequent secondary operation after the inner base pipe is dissolved or extracted.
In a second aspect, the invention provides a wellbore strengthening completion string, which comprises the casing and a connecting device, wherein the inner base pipe and the expandable outer pipe of the casing are fixed by the connecting device, and the connecting device is made of the soluble polyurethane elastic material.
In various embodiments of the present invention, the manner of connection between the inner base pipe and the outer expandable tube is not limited.
In an open hole well or a cased hole, after the well hole reinforced completion pipe column is put into a preset position, the expandable outer pipe is excited to expand by using the temperature of the stratum, then the expandable outer pipe is tightly attached to the inner wall of the well hole, positive extrusion force is generated on the well wall to stabilize the stratum, the shearing effect of the stratum is reduced, the problem of well wall stability is solved, the inner drift diameter is expanded, and after an inner base pipe and a fixing device are dissolved or lifted, the subsequent secondary operation is facilitated.
In a third aspect the invention provides a method of cementing a well completion, the method comprising: and (3) putting the well strengthening completion pipe column into the well, wherein the expandable outer pipe is expanded to the outer diameter of 100-350 mm at 45-120 ℃ and is contacted with the inner wall of the well.
According to some embodiments of the well completion and well cementation method, the inner diameter of the well bore is 100-138 m, and the outer diameter of the expandable outer tube can be tightly attached to the well wall after being expanded.
According to the preferable embodiment of the well completion and well cementation method, the expandable outer pipe is expanded to the outer diameter of 100-350 mm at the temperature of 100-120 ℃.
According to some embodiments of the method of cementing a well completion of the present invention, prior to running the casing into the wellbore, further comprising: the expandable outer pipe is compressed to the inner diameter of 50-250 mm at 70-180 ℃ and is in contact with the outer wall of the inner base pipe, preferably the compression temperature is 100-180 ℃, and more preferably 120-180 ℃.
According to some embodiments of the method of cementing a well completion according to the present invention, the connection means is made of the soluble polyurethane elastomer material.
According to some embodiments of the method of cementing a well completion according to the present invention, the inner basepipe and the connection device are hydrolyzed or dissolved in a completion fluid.
According to some embodiments of the method for cementing a well completion according to the present invention, the soluble polyurethane elastomer material is prepared by:
step A, mixing polyisocyanate with first polyester polyol for reaction to obtain a prepolymer component;
b, mixing second polyester polyol, a chain extender, a catalyst and a hydrophilic agent to obtain a polyol component;
and C, mixing and reacting the prepolymer component and the polyol component.
According to a preferred embodiment of the method for cementing wells in a well completion according to the present invention, the reaction conditions of step a comprise: the temperature is 0-90 ℃ and the time is 2-3 h.
According to the preferable embodiment of the well completion and well cementation method, the reaction temperature of the step C is 30-60 ℃.
According to a preferred embodiment of the well completion and cementing method, in the step C, the weight ratio of the prepolymer component to the polyol component is 30: 100-90: 100.
According to some embodiments of the method for well completion and cementing of the present invention, the raw materials for preparing the prepolymer component comprise 20 to 65 wt% of polyisocyanate and 35 to 80 wt% of the first polyester polyol.
According to the preferable embodiment of the well completion and well cementation method, the content of the isocyanate in the prepolymer component is 5-20 wt%.
According to some embodiments of the well completion and cementing method of the present invention, the polyol component comprises 70 to 100 parts by weight of the second polyester polyol, 4 to 10 parts by weight of the chain extender, 0.5 to 2 parts by weight of the catalyst, and 1 to 25.5 parts by weight of the hydrophilic agent.
According to some embodiments of the method for cementing a well completion, the soluble polyurethane elastic material has a tensile strength of 5 to 30 MPa.
According to some embodiments of the method for cementing a well completion, the soluble polyurethane elastomer material has a shore a (shore a) hardness of 40-90.
According to some embodiments of the method of cementing a well completion of the present invention, the polyisocyanate is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate (MDI, liquefied modified MDI) and polyphenylmethane polyisocyanate (PAPI).
According to a preferred embodiment of the method for cementing wells in a well completion, the toluene diisocyanate is selected from at least one of TDI-65/35, TDI-80/20 and TDI-100.
According to some embodiments of the method of cementing a well completion according to the present invention, the first polyester polyol and the second polyester polyol are each independently an adipic acid-based polyester polyol and/or a castor oil polyester polyol.
According to a preferred embodiment of the method for cementing wells in a well completion, the polymerized monomers of the adipic acid-based polyester polyol comprise adipic acid and alcohols.
According to some embodiments of the method of cementing a well completion of the present invention, the alcohol is at least one of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, methyl propylene glycol, and diethylene glycol.
According to a preferred embodiment of the well completion and cementing method, the adipic acid polyester polyol is at least one of polyethylene glycol adipate diol (PEA) with a number average molecular weight of 2000-4000, polybutylene adipate diol (PBA) with a number average molecular weight of 2000-4000, neopentyl glycol adipate diol (PNA) with a number average molecular weight of 1000-5000, polyethylene glycol adipate diol (PEBA) with a number average molecular weight of 1000-5000, and polyethylene glycol adipate neopentyl glycol ester diol (PENA) with a number average molecular weight of 1000-5000.
According to a specific embodiment of the method for cementing wells in a well completion, the adipic acid-based polyester polyol is at least one of polyethylene adipate glycol having a number average molecular weight of 2000, polyethylene adipate glycol having a number average molecular weight of 4000, polybutylene adipate glycol having a number average molecular weight of 2000, polybutylene adipate glycol having a number average molecular weight of 4000, neopentyl glycol adipate glycol having a number average molecular weight of 4000, polyethylene adipate glycol butylene glycol having a number average molecular weight of 4000, and polyethylene adipate glycol neopentyl glycol having a number average molecular weight of 4000.
According to some embodiments of the method of well completion cementing according to the present invention, the chain extender is an aliphatic chain extender and/or an aromatic chain extender.
According to a preferred embodiment of the method for cementing wells in a well completion, the chain extender is selected from at least one of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA), diaminodimethylmethylthiotoluene (DMTDA), Ethylene Glycol (EG), 1, 4-Butanediol (BDO), diethylene glycol (DEG), Trimethylolpropane (TMP), Triethanolamine (TGA) and Diethanolamine (DEOA).
According to some embodiments of the method of cementing a well completion according to the present invention, the catalyst is a tertiary amine based catalyst and/or an organometallic catalyst.
According to a preferred embodiment of the method for cementing wells in a well completion, the tertiary amine catalyst is selected from at least one of triethylenediamine (a-33), Tetramethylethylenediamine (TMEDA) and Dimethylcyclohexylamine (DMCHA).
According to a preferred embodiment of the method for cementing a well completion according to the present invention, the organometallic catalyst is selected from at least one of dibutyltin dilaurate (DBTDL), stannous octoate, potassium isooctanoate, potassium acetate, potassium oleate, phenylmercuric acetate and zinc isooctanoate.
According to some embodiments of the method of cementing a well completion according to the present invention, the hydrophilic agent is polyethylene glycol and/or a water-absorbent resin.
According to some embodiments of the well completion and cementing method of the present invention, when the hydrophilic agent is polyethylene glycol, the content of the polyethylene glycol is 6 to 23.5 parts by weight.
According to some embodiments of the well completion and cementing method of the present invention, when the hydrophilic agent is a water absorbent resin, the water absorbent resin is present in an amount of 1 to 2 parts by weight.
According to some embodiments of the method for cementing a well completion, the shape memory material is prepared by mixing and foaming polyurethane and hot melt adhesive. In different embodiments of the invention, the shape memory material is prepared by mixing and foaming polyurethane and hot melt adhesive by a rolling or rolling method.
According to some embodiments of the method of cementing a well completion according to the present invention, the hot melt adhesive is selected from at least one of styrene-isoprene-styrene copolymer hot melt adhesives, polyurethane hot melt adhesives, ethylene-vinyl acetate copolymer hot melt adhesives, waterborne polyurethane hot melt adhesives, nylon, and reactive polyurethane hot melt adhesives.
According to some embodiments of the method of cementing a well completion according to the present invention, the weight ratio of the polyurethane to the hot melt adhesive is: 30% -80%: 20 to 70 percent.
According to some embodiments of the method for cementing a well completion, after obtaining the soluble polyurethane elastomer material, further comprising a curing and curing process; preferably, the curing conditions include: the temperature is 20-40 ℃, and the time is 10-30 min; preferably, the curing condition comprises that the temperature is 60-90 ℃ and the time is 1-4 h.
According to the preferable embodiment of the well completion and cementing method, the curing process is 20min at normal temperature.
According to the preferred embodiment of the well completion and cementing method, the curing process is curing at 80 ℃ for 2 hours.
The well completion fixing method provided by the invention has the advantages that after the expandable outer pipe and the inner base pipe are sleeved together, the expandable outer pipe is compressed to be wrapped on the outer wall of the inner base pipe and then is put into a preset position in a well hole together, the expandable outer pipe is expanded by utilizing formation temperature or circulating hot water and is tightly attached to the inner wall of the well hole, positive extrusion force is generated on the well wall to stabilize the formation, the formation shearing effect is reduced, the problem of well wall stability is solved, the inner drift diameter of the outer pipe is expanded, meanwhile, the inner base pipe and the connecting device can be dissolved or hydrolyzed under the action of well completion fluid, or the inner base pipe can be directly lifted out, so that the inner drift diameter of the outer pipe is expanded (the inner drift diameter can be expanded by 20-100%) and the subsequent secondary operation is facilitated.
In a fourth aspect, the invention provides the use of a casing, wellbore strengthening completion string and completion cementing method as described above in oil and gas completion technology, more preferably in oil wells, gas wells and water wells. But is not limited thereto.
During the actual completion process, the wellbore strengthening completion string is conveyed to the target zone by a drill pipe or a tubing pipe, and the outer pipe is excited to expand by the formation temperature or the temperature of the circulating hot water. Because the initial shape of the outer pipe is larger than the size of the borehole, the outer pipe can be attached to the borehole wall after being expanded, and positive extrusion force is generated on the borehole wall to stabilize the stratum, so that the stratum shearing effect is reduced. And the inner base pipe is dissolved under the action of the completion fluid. After the inner base pipe is dissolved, the inner drift diameter of the outer pipe is increased, and then the follow-up secondary operation is convenient to perform.
The invention has the beneficial effects that:
the sleeve provided by the invention comprises an inner base pipe and an expandable outer pipe, wherein the inner base pipe is made of a soluble polyurethane elastic material, and the soluble polyurethane elastic material has the effect of controllable hydrolysis speed. The expandable outer pipe is made of shape memory materials, so that the casing can be expanded at high temperature and attached to a well wall in the process of underground work of the well strengthening completion pipe column, positive extrusion force is generated to stabilize a stratum, and the inner base pipe can increase the inner drift diameter of the outer pipe after being dissolved under the action of completion fluid, so that follow-up secondary operation is facilitated.
The preparation method is simple, easy to operate, safe and environment-friendly.
Detailed Description
In order that the present invention may be more readily understood, the following detailed description of the invention is given by way of example only, and is not intended to limit the scope of the invention.
The test method and the equipment used in the test are as follows:
(1) the hardness test uses a type TH110 durometer.
(2) The tensile strength and compressive strength were measured using a universal tester model WE-300.
The sources of the various chemical reagents used in the present invention are:
Figure BDA0002735651740000111
Figure BDA0002735651740000121
[ example 1 ]
Preparing an inner base pipe of a well strengthening completion pipe column:
(1) preparation of the prepolymer component: taking the 2-functionality, 49.2 weight percent of PEA-2000 and 50.8 weight percent of MDI-100 according to weight percent, mixing the two, and reacting at 80 ℃ for 2.5 hours to obtain a prepolymer component with 15 weight percent of isocyanate group.
(2) Preparation of the polyol component: and (2) putting 20 parts by weight of PEA-2000, 70 parts by weight of PEA-4000, 10 parts by weight of PEG4000, 5 parts by weight of BDO and 0.5 part by weight of stannous octoate in a high-speed stirrer, and uniformly stirring to obtain the polyol component.
(3) Preparing an inner base pipe: the prepolymer component and the polyol component obtained in the above step were mixed with a chain extension coefficient of 0.95 and reacted. Wherein the temperature of the mixing reaction was 50 ℃. After mixing and reacting, spraying the mixture into a sheet with the thickness of 2mm, and then carrying out gel treatment for 2min and curing and forming treatment for 5min to obtain the inner-layer base tube.
[ example 2 ]
Preparing an inner base pipe of a well strengthening completion pipe column:
(1) preparation of the prepolymer component: taking the 2-functionality, 49.2 weight percent of PBA-2000 and 50.8 weight percent of MDI-100 according to weight percent, mixing the two, and reacting at 80 ℃ for 2.5 hours to obtain a prepolymer component with 15 weight percent of isocyanate group.
(2) Preparation of the polyol component: and (2) placing 30 parts by weight of PBA-2000, 60 parts by weight of PEA-4000, 10 parts by weight of PEG600, 5 parts by weight of HDO and 0.5 part by weight of stannous octoate in a high-speed stirrer to be uniformly stirred to obtain the polyol component.
(3) Preparing an inner base pipe: the prepolymer component and the polyol component obtained in the above step were mixed with a chain extension coefficient of 0.95 and reacted. Wherein the temperature of the mixing reaction was 50 ℃. After mixing and reacting, spraying the mixture into a sheet with the thickness of 2mm, and then carrying out gel treatment for 2min and curing and forming treatment for 5min to obtain the inner-layer base tube.
[ example 3 ]
Preparing an inner base pipe of a well strengthening completion pipe column:
(1) preparation of the prepolymer component: taking the mixture of 2 functionality, 60.5 weight percent of PNA-4000 and 39.5 weight percent of MDI-100 according to weight percent, and reacting the mixture for 2.5 hours at 80 ℃ to obtain a prepolymer component with 12 weight percent of isocyanate group.
(2) Preparation of the polyol component: and (2) putting 80 parts by weight of PNA-4000, 20 parts by weight of PENA-4000, 2 parts by weight of SAP, 5 parts by weight of BDO and 0.5 part by weight of stannous octoate into a high-speed stirrer, and uniformly stirring to obtain the polyol component.
(3) Preparing an inner base pipe: the prepolymer component and the polyol component obtained in the above step were mixed with a chain extension coefficient of 0.95 and reacted. Wherein the temperature of the mixing reaction was 50 ℃. After mixing and reacting, spraying the mixture into a sheet with the thickness of 2mm, and then carrying out gel treatment for 2min and curing and forming treatment for 5min to obtain the inner-layer base tube.
[ example 4 ]
Preparing an inner base pipe of a well hole strengthening completion string:
(1) preparation of the prepolymer component: taking the 2-functionality, 49.2 weight percent of PBA-2000 and 50.8 weight percent of MDI-100 according to weight percent, mixing the two, and reacting at 80 ℃ for 2.5 hours to obtain a prepolymer component with 15 weight percent of isocyanate group.
(2) Preparation of the polyol component: taking 30 parts by weight of PBA-2000, 50 parts by weight of PEA-2000, 20 parts by weight of PEG600, 2 parts by weight of SAP, 5 parts by weight of BDO and 0.5 part by weight of stannous octoate,
and (4) placing the mixture into a high-speed stirrer to be uniformly stirred to obtain the polyol component.
(3) Preparing an inner base pipe: the prepolymer component and the polyol component obtained in the above step were mixed with a chain extension coefficient of 0.95 and reacted. Wherein the temperature of the mixing reaction was 50 ℃. After mixing and reacting, spraying the mixture into a sheet with the thickness of 2mm, and then carrying out gel treatment for 2min and curing and forming treatment for 5min to obtain an inner-layer base tube.
[ example 5 ]
Preparing an inner base pipe of a well strengthening completion pipe column:
(1) preparation of the prepolymer component: taking the 2-functionality, 68 wt% of PEBA-4000 and 32 wt% of TDI-100 according to weight percentage, mixing the two, and reacting for 2.5 hours at 80 ℃ to obtain a prepolymer component with 14 wt% of isocyanate group.
(2) Preparation of the polyol component: and (2) placing 30 parts by weight of PBA-2000, 60 parts by weight of PEA-2000, 10 parts by weight of PEG4000, 2 parts by weight of SAP, 4 parts by weight of DMTDA and 0.5 part by weight of stannous octoate in a high-speed stirrer, and uniformly stirring to obtain the polyol component.
(3) Preparing an inner base pipe: the prepolymer component and the polyol component obtained in the above step were mixed with a chain extension coefficient of 0.95 and reacted. Wherein the temperature of the mixing reaction was 50 ℃. After mixing and reacting, spraying the mixture into a sheet with the thickness of 2mm, and then carrying out gel treatment for 2min and curing and forming treatment for 5min to obtain the inner-layer base tube.
The inner basepipe used in the wellbore strengthening completion string prepared in examples 1-5 above has the following properties, as shown in table 1:
TABLE 1
Figure BDA0002735651740000141
Figure BDA0002735651740000151
For the expandable outer pipe of the well hole strengthening completion pipe column, the invention adopts shape memory materials, and polyurethane with different formulas and hot melt adhesive are obtained through chemical reaction. The following table 2 shows the performance tests for expandable outer tube materials prepared from the polymers of different formulations in examples 6 to 11 of the present invention.
TABLE 2
Figure BDA0002735651740000152
Figure BDA0002735651740000161
Remarking:
SIS: styrene-isoprene-styrene copolymers.
EVA: ethylene-vinyl acetate copolymer.
PA: nylon.
[ example 12 ]
The material of example 2 is subjected to shaping shearing treatment to prepare an inner base pipe (the outer diameter is 73mm, the length is 2000mm, and the aperture is 62mm), the material of example 6 is subjected to shaping shearing treatment to prepare an expandable outer pipe (the outer diameter is 90mm, the inner diameter is 73.6mm, and the length is 2000mm), the outer pipe is sleeved on the outer side of the inner base pipe, the outer pipe is compressed at 120 ℃ to be tightly attached to the outer side of the inner base pipe, then the outer pipe and the inner base pipe are put into an oil well together, the formation temperature in the oil well is 55 ℃, the outer pipe is expanded to the outer diameter of 162mm and is tightly attached to the well wall, the inner base pipe is gradually dissolved under the flow of petroleum stock solution, and at the moment, the inner diameter of the outer pipe is expanded to 100 mm.
[ example 13 ]
The material of example 3 is subjected to shaping shearing treatment to prepare an inner base pipe (the outer diameter is 88.9mm, the length is 2000mm, and the aperture is 76mm), the material of example 7 is subjected to shaping shearing treatment to prepare an expandable outer pipe (the outer diameter is 132mm, the inner diameter is 89.3mm, and the length is 2000mm), the outer pipe is sleeved on the outer side of the inner base pipe, the outer pipe is compressed at 140 ℃ to be tightly attached to the outer side of the inner base pipe, then the outer pipe and the inner base pipe are put into an oil well together, the formation temperature in the oil well is 65 ℃, the outer pipe is expanded to 245mm in outer diameter and is tightly attached to a well wall at the moment, the inner base pipe is gradually dissolved under the flowing of petroleum stock solution, and at the moment, the inner diameter of the outer pipe is expanded to 120 mm.
[ example 14 ]
The material of example 4 is subjected to shaping shearing treatment to prepare an inner base pipe (the outer diameter is 63mm, the length is 2000mm, and the aperture is 50mm), the material of example 6 is subjected to shaping shearing treatment to prepare an expandable outer pipe (the outer diameter is 120mm, the inner diameter is 63.5mm, and the length is 2000mm), the outer pipe is sleeved on the outer side of the inner base pipe, the outer pipe is compressed at 150 ℃ to be tightly attached to the outer side of the inner base pipe, then the outer pipe and the inner base pipe are put into an oil well together, the formation temperature in the oil well is 75 ℃, the outer pipe is expanded to the outer diameter of 245mm and is tightly attached to a well wall, the inner base pipe is gradually dissolved under the flow of petroleum stock solution, and at the moment, the inner diameter of the outer pipe is expanded to 90 mm.
In the present invention, the expandable outer tube expands when activated by the temperature of the formation or the temperature of the circulating hot water. Because the initial shape of the outer pipe is larger than the size of the borehole, the outer pipe can be attached to the borehole wall after being expanded, and positive extrusion force is generated on the borehole wall to stabilize the stratum, so that the stratum shearing effect is reduced. And the inner base pipe is dissolved under the action of the completion fluid. After the inner base pipe is dissolved, the inner drift diameter of the outer pipe is increased (the inner drift diameter can be enlarged by 20-100%), and then the subsequent secondary operation is facilitated.
What has been described above is merely a preferred example of the present invention. It should be noted that other equivalent variations and modifications can be made by those skilled in the art based on the technical teaching provided by the present invention, and the protection scope of the present invention should be considered.

Claims (10)

1. A casing comprises an inner base pipe and an expandable outer pipe sleeved outside the inner base pipe; the inner base pipe is made of a soluble polyurethane elastic material, and the expandable outer pipe is made of a shape memory material; the outer diameter of the inner base pipe is 50-250 mm, the inner diameter of the expandable outer pipe is larger than 50mm to larger than 250mm, and the outer diameter of the expandable outer pipe is 60-300 mm.
2. The bushing of claim 1, wherein the compression temperature to compress the inner diameter of the expandable outer tube to 50-250 mm is 70-180 ℃, preferably 100-180 ℃, more preferably 120-180 ℃;
the expansion temperature for expanding the inner diameter of the expandable outer pipe to 60-260 mm is 45-120 ℃, preferably the outer diameter of the expandable outer pipe is expanded to 100-350 mm, and preferably the expansion temperature is 100-120 ℃.
3. The bushing of claim 1 or 2, wherein the soluble polyurethane elastomer is prepared from a starting material comprising a prepolymer component and a polyol component;
the preparation raw materials of the prepolymer component comprise 20-65 wt% of polyisocyanate and 35-80 wt% of first polyester polyol; preferably, the content of isocyanate in the prepolymer component is 5-20 wt%;
the polyol component comprises 70-100 parts by weight of second polyester polyol, 4-10 parts by weight of chain extender, 0.5-2 parts by weight of catalyst and 1-25.5 parts by weight of hydrophilic agent; and/or the presence of a gas in the gas,
the weight ratio of the prepolymer component to the polyol component is 30: 100-90: 100; and/or the presence of a gas in the gas,
the tensile strength of the soluble polyurethane elastic material is 5-30 MPa; and/or the presence of a gas in the gas,
the polyisocyanate is selected from at least one of toluene diisocyanate, diphenylmethane diisocyanate and polyphenyl methane polyisocyanate; and/or the presence of a gas in the gas,
the first polyester polyol and the second polyester polyol are each independently an adipic acid-based polyester polyol and/or a castor oil polyester polyol; preferably, the polymerized monomers of the adipic acid-based polyester polyol include adipic acid and alcohols, preferably, the alcohols are selected from at least one of ethylene glycol, propylene glycol, butylene glycol, neopentyl glycol, methyl propylene glycol, and diethylene glycol; more preferably, the adipic acid-based polyester polyol is at least one of polyethylene glycol adipate glycol with the number average molecular weight of 2000-4000, polybutylene adipate glycol with the number average molecular weight of 2000-4000, neopentyl glycol adipate glycol with the number average molecular weight of 1000-5000, polyethylene glycol adipate glycol butanediol with the number average molecular weight of 1000-5000 and polyethylene glycol neopentyl glycol adipate glycol with the number average molecular weight of 1000-5000; and/or the presence of a gas in the gas,
the chain extender is selected from at least one of 3,3 '-dichloro-4, 4' -diaminodiphenylmethane, diaminodimethylthiotoluene, ethylene glycol, 1, 4-butanediol, diethylene glycol, trimethylolpropane, triethanolamine and diethanolamine; and/or the presence of a gas in the gas,
the catalyst is tertiary amine catalyst and/or organic metal catalyst; preferably, the tertiary amine catalyst is selected from at least one of triethylenediamine, tetramethylethylenediamine and dimethylcyclohexylamine; preferably, the organometallic catalyst is selected from at least one of dibutyltin dilaurate, stannous octoate, potassium isooctanoate, potassium acetate, potassium oleate, phenylmercuric acetate, and zinc isooctanoate; and/or the presence of a gas in the gas,
the hydrophilic agent is polyethylene glycol and/or water-absorbent resin; preferably, the content of the polyethylene glycol is 6-23.5 parts by weight, and the content of the water-absorbing resin is 1-2 parts by weight.
4. The cannula according to any of claims 1-3, wherein the shape memory material is prepared by mixing and foaming polyurethane and hot melt adhesive;
preferably, the hot melt adhesive is at least one selected from styrene-isoprene-styrene copolymer hot melt adhesives, polyurethane hot melt adhesives, ethylene-vinyl acetate copolymer hot melt adhesives, waterborne polyurethane hot melt adhesives, nylon and reactive polyurethane hot melt adhesives; and/or the presence of a gas in the gas,
the weight ratio of the polyurethane to the hot melt adhesive is as follows: 30% -80%: 20 to 70 percent.
5. A wellbore strengthening completion string comprising a casing according to any of claims 1-4 and a connection means by which the inner basepipe and the expandable outer tube of the casing are secured, said connection means being made of a soluble polyurethane elastomer material.
6. A method of cementing a well completion, the method comprising: running the wellbore strengthening completion string of claim 5 into the wellbore, wherein the expandable outer tube expands to an outer diameter of 100-350 mm at 45-120 ℃ and contacts the inner wall of the wellbore.
7. The method of completion cementing according to claim 6, further comprising, prior to running the casing into the wellbore: the expandable outer pipe is compressed to the inner diameter of 50-250 mm at 70-180 ℃ and is in contact with the outer wall of the inner base pipe, preferably the compression temperature is 100-180 ℃, and more preferably 120-180 ℃; and/or the presence of a gas in the atmosphere,
preferably, the expandable outer pipe expands to an outer diameter of 100-350 mm at 100-120 ℃; and/or the presence of a gas in the gas,
the connecting device is made of the soluble polyurethane elastic material; preferably, the inner basepipe and the connection means are hydrolysed or dissolved in completion fluid.
8. A method for well completion and cementation according to claim 6 or 7, wherein the soluble polyurethane elastic material is prepared by the following steps:
step A, mixing polyisocyanate with first polyester polyol for reaction to obtain a prepolymer component;
b, mixing second polyester polyol, a chain extender, a catalyst and a hydrophilic agent to obtain a polyol component;
and C, mixing and reacting the prepolymer component and the polyol component.
9. The method for cementing a well completion according to claim 8, further comprising a curing and aging process after obtaining the soluble polyurethane elastomer material;
preferably, the curing conditions include: the temperature is 20-40 ℃, and the time is 10-30 min; preferably, the ripening conditions comprise: the temperature is 60-90 ℃, and the time is 1-4 h; and/or the presence of a gas in the gas,
the preparation raw materials of the prepolymer component comprise 20-65 wt% of polyisocyanate and 35-80 wt% of first polyester polyol; preferably, the content of isocyanate in the prepolymer component is 5-20 wt%; and/or the presence of a gas in the gas,
the polyol component comprises 70-100 parts by weight of second polyester polyol, 4-10 parts by weight of chain extender, 0.5-2 parts by weight of catalyst and 1-25.5 parts by weight of hydrophilic agent; and/or the presence of a gas in the gas,
the hydrophilic agent is polyethylene glycol and/or water-absorbent resin; preferably, the content of the polyethylene glycol is 6-23.5 parts by weight, and the content of the water-absorbing resin is 1-2 parts by weight; and/or the presence of a gas in the gas,
the reaction conditions in step a include: the temperature is 0-90 ℃, and the time is 2-3 h; and/or the presence of a gas in the gas,
the reaction temperature in the step C is 30-60 ℃; the weight ratio of the prepolymer component to the polyol component is 30: 100-90: 100 when the prepolymer component and the polyol component are mixed.
10. Use of a casing according to any of claims 1-4, a wellbore strengthening completion string according to claim 5, a completion cementing method according to any of claims 6-9 in oil and gas completion technology, preferably in oil wells, gas wells and water wells.
CN202011132644.8A 2020-10-21 2020-10-21 Casing, well strengthening completion pipe string, well completion and well cementation method and application Pending CN114458171A (en)

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