CN112480885A - Bridging synergist for drilling fluid - Google Patents
Bridging synergist for drilling fluid Download PDFInfo
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- CN112480885A CN112480885A CN202011447683.7A CN202011447683A CN112480885A CN 112480885 A CN112480885 A CN 112480885A CN 202011447683 A CN202011447683 A CN 202011447683A CN 112480885 A CN112480885 A CN 112480885A
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- drilling fluid
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- 238000005553 drilling Methods 0.000 title claims abstract description 29
- 239000012530 fluid Substances 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 46
- 239000000919 ceramic Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 23
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 22
- 239000002557 mineral fiber Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 16
- 150000001875 compounds Chemical class 0.000 claims abstract description 14
- 239000011347 resin Substances 0.000 claims abstract description 14
- 229920005989 resin Polymers 0.000 claims abstract description 14
- 229920000049 Carbon (fiber) Polymers 0.000 claims abstract description 13
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229910052599 brucite Inorganic materials 0.000 claims abstract description 13
- 239000004917 carbon fiber Substances 0.000 claims abstract description 13
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 13
- 229920002522 Wood fibre Polymers 0.000 claims abstract description 11
- 239000002025 wood fiber Substances 0.000 claims abstract description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 10
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 9
- 235000011613 Pinus brutia Nutrition 0.000 claims description 9
- 241000018646 Pinus brutia Species 0.000 claims description 9
- 241000219000 Populus Species 0.000 claims description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical group [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- 239000002893 slag Substances 0.000 claims description 2
- 238000013329 compounding Methods 0.000 claims 1
- 229920001410 Microfiber Polymers 0.000 abstract description 2
- 239000003658 microfiber Substances 0.000 abstract description 2
- 239000011859 microparticle Substances 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 34
- 238000003756 stirring Methods 0.000 description 25
- 238000012360 testing method Methods 0.000 description 23
- 230000000052 comparative effect Effects 0.000 description 17
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 239000000203 mixture Substances 0.000 description 10
- 241000758789 Juglans Species 0.000 description 9
- 235000009496 Juglans regia Nutrition 0.000 description 9
- 239000010445 mica Substances 0.000 description 9
- 229910052618 mica group Inorganic materials 0.000 description 9
- 235000020234 walnut Nutrition 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000012153 distilled water Substances 0.000 description 7
- 238000002474 experimental method Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 5
- 238000009775 high-speed stirring Methods 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- 229920001285 xanthan gum Polymers 0.000 description 5
- 239000000230 xanthan gum Substances 0.000 description 5
- 229940082509 xanthan gum Drugs 0.000 description 5
- 235000010493 xanthan gum Nutrition 0.000 description 5
- 229910021532 Calcite Inorganic materials 0.000 description 4
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 4
- 239000000440 bentonite Substances 0.000 description 3
- 229910000278 bentonite Inorganic materials 0.000 description 3
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 238000004154 testing of material Methods 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- NIPNSKYNPDTRPC-UHFFFAOYSA-N N-[2-oxo-2-(2,4,6,7-tetrahydrotriazolo[4,5-c]pyridin-5-yl)ethyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C(CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F)N1CC2=C(CC1)NN=N2 NIPNSKYNPDTRPC-UHFFFAOYSA-N 0.000 description 1
- VCUFZILGIRCDQQ-KRWDZBQOSA-N N-[[(5S)-2-oxo-3-(2-oxo-3H-1,3-benzoxazol-6-yl)-1,3-oxazolidin-5-yl]methyl]-2-[[3-(trifluoromethoxy)phenyl]methylamino]pyrimidine-5-carboxamide Chemical compound O=C1O[C@H](CN1C1=CC2=C(NC(O2)=O)C=C1)CNC(=O)C=1C=NC(=NC=1)NCC1=CC(=CC=C1)OC(F)(F)F VCUFZILGIRCDQQ-KRWDZBQOSA-N 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/08—Fiber-containing well treatment fluids
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/18—Bridging agents, i.e. particles for temporarily filling the pores of a formation; Graded salts
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a bridging synergist for drilling fluid, which comprises the following components in percentage by mass: 20-40% of wood fiber, 35-40% of inorganic mineral fiber, 20-30% of inorganic rigid particles and 5-10% of inorganic reinforcing agent. The inorganic rigid particles are resin sand with the particle size of 200 meshes or a compound of the resin sand and ceramic powder; the inorganic mineral fiber is the combination of brucite fiber, aluminum silicate fiber and carbon fiber; the length of the brucite fiber is 1-3 mm, the diameter is 0.5-16 um, the length of the aluminum silicate fiber is 2-4 mm, the diameter is 0.7-20 um, the length of the carbon fiber is 1-4 mm, and the diameter is 0.5-18 um; the mass ratio of the brucite fibers to the aluminum silicate fibers to the carbon fibers is 5:4: 1. The bridging synergist disclosed by the invention can effectively plug micro cracks and improve the compactness of a bridge plug by matching the micro fibers and the micro particles, so that the pressure-bearing capacity is enhanced.
Description
Technical Field
The invention relates to the technical field of drilling fluid leakage stoppage in petroleum drilling engineering, in particular to a bridging synergist for drilling fluid.
Background
In the process of oil exploration and development, well leakage is the most common complex phenomenon. With the increase of wells and ultra-deep wells in complex blocks, the problem of lost circulation seriously restricts the exploration and development process, however, the traditional lost circulation is difficult to be successfully stopped once and twice, and can be finally solved through repeated stopping for many times, and the success rate is extremely low. And the occurrence of the lost circulation is caused by the poor pressure bearing capacity of the stratum. In order to solve the well leakage, improve the pressure bearing capacity of the stratum and reduce the occurrence probability of the well leakage, thereby reducing the economic loss and promoting the exploration and development pace, the research and the application of the plugging material and the plugging technology are inevitably increased.
At present, most of treatment modes of the well leakage of various domestic oil fields in the drilling engineering are firstly to adopt bridging plugging materials for plugging construction, and the leakage layer can not be completely plugged after the bridging materials are used for plugging construction for many times; cement or other materials are selected. The biggest difficult problem of bridging leaking stoppage is particle grading, which often causes multiple leaking stoppage failures due to unreasonable grading, wastes time and financial resources, and many times, leaking stoppage is not thorough, the leaking speed is reduced after plugging, but the condition of leaking or low pressure-bearing capacity still occurs. The main reasons for this are that the particle size distribution is not well regulated, the particle size is too large to seal the door, and the plugging agent with too small particle size is difficult to effectively reside in the leakage passage. And the leakage channel contains micro cracks, so that the bridge plugging material is difficult to enter for effective plugging.
Disclosure of Invention
The invention provides a bridging synergist for drilling fluid, aiming at improving the success rate of bridging plug plugging.
The bridging synergist for the drilling fluid provided by the invention comprises the following components in percentage by mass:
20-40% of wood fiber, 35-40% of inorganic mineral fiber, 20-30% of inorganic rigid particles and 5-10% of inorganic reinforcing agent.
Wherein, the inorganic rigid particles are resin sand with the particle size of 200 meshes or a compound of the resin sand and ceramic powder.
The wood fiber is pine fiber or poplar fiber with the length of 1-3 mm and the diameter of 0.5-15 um, or a compound of the two.
The inorganic mineral fiber is the combination of brucite fiber, aluminum silicate fiber and carbon fiber. Wherein, the length of the brucite fiber is 1-3 mm, and the diameter is 0.5-16 um. The length of the aluminum silicate fiber is 2-4 mm, and the diameter is 0.7-20 um. The length of the carbon fiber is 1-4 mm, and the diameter is 0.5-18 um. The mass ratio of the brucite fibers to the aluminum silicate fibers to the carbon fibers is 5:4: 1.
The ceramic powder is a compound with three particle sizes of 2500 meshes, 1500 meshes and 800 meshes. The compound mass ratio of the 2500-mesh ceramic powder to the 1500-mesh ceramic powder to the 800-mesh ceramic powder is (4-5): (2-4): (1-3).
The inorganic reinforcing agent is aluminum slag with the particle size of 300 meshes.
According to a preferable scheme, the bridging synergist for the drilling fluid comprises the following components in percentage by mass: 30% of wood fiber, 40% of inorganic mineral fiber, 25% of resin sand and 5% of inorganic reinforcing agent.
In another preferred scheme, the bridging synergist for the drilling fluid comprises the following components in percentage by mass: 40% of wood fiber, 30% of inorganic mineral fiber, 20% of compound of resin sand and ceramic powder in mass ratio and 10% of inorganic reinforcing agent.
The bridging synergist product can be obtained by uniformly mixing the substances according to the component proportion and the gradation.
Compared with the prior art, the invention has the advantages that:
(1) the bridging synergist of the invention is prepared by mutually inserting, winding and coating a plurality of composite fibers in the plugging slurry to compound the granular materials entering the plugging slurry, so that the separated single granular materials are combined into the multi-granular material, the multi-granular material is easy to bend and deform, the bridging capability and the staying capability of the plugging slurry can be effectively enhanced, and a bridge can be easily hung and blocked after entering a leakage channel, thereby improving the success rate of bridging and plugging. And after the wound and wrapped granular material enters the leakage channel, the formed blockage has certain deformation capacity, and the shape of the blockage can be changed when underground pressure fluctuates, so that the phenomenon that the drilling fluid leaks again to form leakage due to the fact that the blockage structure is damaged is avoided.
(2) By the compound use of the micro-fiber and the micro-particles, the micro-cracks can be effectively blocked, and the compactness of the bridge plug is improved, so that the bearing capacity is enhanced. The research results of simulated pore and microcrack test experiments show that the pressure-bearing capacity of the bridging synergist of the invention is over 7MPa even if test slurry prepared by clear water is used.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and description, and is in no way intended to limit the invention.
Example 1
The bridge plugging synergist for the drilling fluid comprises the following components in percentage by mass: 30% of pine wood fiber, 40% of inorganic mineral fiber, 25% of resin sand and 5% of inorganic reinforcing agent; wherein the inorganic mineral fiber has the following grading: brucite fiber: aluminum silicate fiber: carbon fiber 5:4: 1.
The product can be obtained after all the components are mixed evenly.
Example 2
The bridge plugging synergist for the drilling fluid comprises the following components in percentage by mass: 40% of poplar wood fiber, 30% of inorganic mineral fiber, 20% of resin sand and ceramic powder and other compounds in mass ratio, and 10% of inorganic reinforcing agent; wherein the inorganic mineral fiber has the following grading: brucite fiber: aluminum silicate fiber: carbon fiber 5:4: 1; wherein the grain-grade proportion of the ceramic powder is as follows: ceramic powder (2500 mesh): ceramic powder (1500 mesh): ceramic powder (800 mesh) 4: 4: 2
The product can be obtained after all the components are mixed evenly.
Example 3
The bridge plugging synergist for the drilling fluid comprises the following components in percentage by mass: 35% of mixture of pine fiber and poplar fiber in equal mass ratio, 35% of inorganic mineral fiber, 20% of resin sand and 10% of inorganic reinforcing agent; wherein the inorganic mineral fiber has the following grading: brucite fiber: aluminum silicate fiber: carbon fiber 5:4: 1. The product can be obtained after all the components are mixed evenly.
Example 4
The bridge plugging synergist for the drilling fluid comprises the following components in percentage by mass: 30% of mixture of pine fiber and poplar fiber in equal mass ratio, 35% of inorganic mineral fiber, 25% of compound of resin sand and ceramic powder in equal mass ratio and 10% of inorganic reinforcing agent; wherein the inorganic mineral fiber has the following grading: brucite fiber: aluminum silicate fiber: carbon fiber 5:4: 1; wherein the grain-grade proportion of the ceramic powder is as follows: ceramic powder (2500 mesh): ceramic powder (1500 mesh): ceramic powder (800 mesh) 4: 3: 4.
the product can be obtained after all the components are mixed evenly.
The following experiments were carried out using the bridging synergists prepared in examples 1 to 4:
first, plugging capability evaluation experiment
1. Simulating pores and microcracks
(1) Laboratory apparatus
GGS-71 high-temperature high-pressure filtration loss instrument.
(2) Sample slurry preparation: weighing 400ml of distilled water, adding 0.4g (accurate to 0.01g) of sodium hydroxide under high-speed stirring, stirring for 5min at high speed, adjusting the pH value to 9-10, adding 16.0g (accurate to 0.01g) of the bridging synergist prepared in the embodiment, stirring for 10min at high speed, adding 1.6g (accurate to 0.01g) of xanthan gum (XC), and stirring for 30min at high speed to obtain sample slurry.
Comparative example 1: weighing 400ml of distilled water, adding 0.4g (accurate to 0.01g) of sodium hydroxide under high-speed stirring, stirring at high speed for 5min, adjusting the pH value to 9-10, adding 1.6g (accurate to 0.01g) of xanthan gum (XC), and stirring at high speed for 30min to obtain a comparison sample 1.
Comparative example 2: weighing 400ml of distilled water, adding 0.4g (accurate to 0.01g) of sodium hydroxide under high-speed stirring, stirring at high speed for 5min, adjusting the pH value to 9-10, adding 16.0g (accurate to 0.01g) of a mixture of pine fiber and poplar fiber in a mass ratio, stirring at high speed for 10min, adding 1.6g (accurate to 0.01g) of xanthan gum (XC), and stirring at high speed for 30min to obtain a comparative sample 2.
Comparative example 3: weighing 400ml of distilled water, adding 0.4g (accurate to 0.01g) of sodium hydroxide under high-speed stirring, stirring at high speed for 5min, adjusting the pH value to 9-10, adding 16.0g (accurate to 0.01g) of inorganic mineral fiber, stirring at high speed for 10min, adding 1.6g (accurate to 0.01g) of xanthan gum (XC), and stirring at high speed for 30min to obtain a comparative sample 3.
Comparative example 4: weighing 400ml of distilled water, adding 0.4g (accurate to 0.01g) of sodium hydroxide under high-speed stirring, stirring at high speed for 5min, adjusting the pH value to 9-10, adding 8.0g (accurate to 0.01g) of a mixture of pine fiber, poplar fiber and the like in a mass ratio and 8.0g (accurate to 0.01g) of inorganic mineral fiber, stirring at high speed for 10min, adding 1.6g (accurate to 0.01g) of xanthan gum (XC), and stirring at high speed for 30min to obtain a comparative sample 4.
(3) The testing steps are as follows:
a GGS-71 type high-temperature high-pressure filtration loss instrument is used as a testing instrument; the drilling fluid cup is not added with filter paper and a filter screen, 500g of dry and clean river sand of 20-40 meshes is added, and the river sand is tightly inserted, compacted and paved by a small iron rod under the condition that a lower ventilation valve rod is opened; the sample slurry is drained by a glass rod and slowly added into a 150ml high-temperature high-pressure drilling fluid cup; and (3) installing an upper cover of the cup, opening an upper valve rod, slowly pressurizing to 0.7MPa for 15min, and slowly and uniformly pressurizing to 7.0MPa for 30 min.
(4) Determination method
If no filter loss exists, the pressure bearing is successful.
(5) The test results are shown in table 1 below.
TABLE 1 simulated pore and microcrack testing
| Sample name | Test pressure (MPa) | Test results |
| Example 1 | 7 | Qualified |
| Example 2 | 7 | Qualified |
| Example 3 | 7 | Qualified |
| Example 4 | 7 | Qualified |
| Comparative example 1 | 0.7 | Fluid loss |
| Comparative example 2 | 0.7 | Fluid loss |
| Comparative example 3 | 0.7 | Fluid loss |
| Comparative example 4 | 0.7 | Fluid loss |
2. Simulated crack experiment
(1) Laboratory apparatus
QD-2 type plugging material test device.
(2) Sample slurry preparation
Base slurry: 2000ml of distilled water is measured, 160.0g of bentonite and 2.00g of sodium carbonate (accurate to 0.01g) are added under the stirring condition of a low-speed stirrer, the mixture is stirred for 1 hour cumulatively, and the mixture is placed for 16 hours at room temperature in a sealing way for standby.
Test slurry: and taking 2000ml of the prepared base slurry, sequentially adding 80.0g of the bridging synergist prepared in the embodiment, 150.0g (1-2 mm) of walnut shells and 100.0g of mica sheets (1-2 mm), and stirring for 30 min.
Comparative example 1: taking 2000ml of the prepared base pulp, sequentially adding 80.0g of a mixture of pine fibers and poplar fibers in a mass ratio, 150.0g (1-2 mm) of walnut shells and 100.0g (1-2 mm) of mica sheets, and stirring for 30 min.
Comparative example 2: taking 2000ml of the prepared base slurry, sequentially adding 80.0g of inorganic mineral fiber, 150.0g (1-2 mm) of walnut shell and 100.0g of mica sheet (1-2 mm), and stirring for 30 min.
Comparative example 3: taking 2000ml of the prepared base pulp, sequentially adding 40.0g of a mixture of pine fibers, poplar fibers and the like in a mass ratio, 40g of inorganic mineral fibers, 150.0g (1-2 mm) of walnut shells and 100.0g of mica sheets (1-2 mm), and stirring for 30 min.
(3) The test method comprises the following steps:
a2 mm seam plate is arranged on an inner step of a ball valve joint of the QD-2 type plugging material testing device, an outlet elbow is screwed, the ball valve is opened, and a liquid receiving container is arranged below the outlet. Injecting 2000ml of prepared test slurry into a plugging material device, screwing a tank cover, connecting a pressurized pipeline, and standing for 5 min. Opening the discharge port, opening the air source to pressurize, firstly adding 0.7MPa pressure, stabilizing pressure for 15min, slowly pressurizing to 10MPa, stabilizing pressure for 30min, stopping pressurizing, and measuring the filtration loss.
(4) Determination method
The filtration loss is lower than 1000ml, and the product is qualified.
(5) The test results are shown in Table 2 below
TABLE 2 simulated crack test results
| Sample name | Test pressure (MPa) | Fluid loss (ml) | Test results |
| Example 1 | 10 | 430 | Qualified |
| Example 2 | 10 | 380 | Qualified |
| Example 3 | 10 | 480 | Qualified |
| Example 4 | 10 | 400 | Qualified |
| Comparative example 1 | 3 | Greater than 1000 | Fail to be qualified |
| Comparative example 2 | 4.5 | Greater than 1000 | Fail to be qualified |
| Comparative example 3 | 5.5 | Greater than 1000 | Fail to be qualified |
3. Temperature resistance test (2mm seam plate)
(1) Testing an instrument: the patent 202022642932.X of the prior application of the applicant is a portable pressure-bearing leak-stopping instrument.
(2) The base slurry formula comprises: 4% bentonite slurry +0.3KPAM + 0.5% polyamine + 1% PAC-LV + 7% KCl + 8% SMP-II + 8% SPNH +
3% FT-1+ 2% Rhpej-3+ 3% QS-2+ barite (weighted to 1.6 g/cm)3)。
(3) The test slurry formula is as follows:
a. base slurry, 5% of walnut shell, 10-20 meshes, 5% of mica, 1-2mm, 2% of calcite, 10-20 meshes, 3% of plugging agent while drilling and 3% of example 1
b. Base slurry, 5% of walnut shell, 10-20 meshes, 5% of mica, 1-2mm, 2% of calcite, 10-20 meshes, 3% of plugging agent while drilling and 3% of example 2
c. Base slurry + 5% walnut shell 10-20 mesh + 5% mica 1-2mm + 2% calcite 10-20 mesh + 3% leak stoppage while drilling + 3% EXAMPLE 3
d. Base slurry + 5% walnut shell 10-20 mesh + 5% mica 1-2mm + 2% calcite 10-20 mesh + 3% leak stoppage while drilling + 3% EXAMPLE 4
(4) Experimental test method
a. Preparing base slurry according to the base slurry formula, pouring 400ml of base slurry into a slurry cup for later use, and preparing sample slurry according to the test slurry formula;
b. placing the slurry cup on a high-speed stirrer, adjusting the rotating speed to 11000rpm, starting the stirrer, and adding corresponding materials;
c. after stirring, pouring into an aging tank, and curing at 260 ℃ for 16 h;
d. pouring out the experimental slurry after the maintenance is finished, and continuously stirring for 10 min; after stirring, the mixture was poured into an experimental apparatus (202022642932.X, a portable pressure-bearing leak-stopping apparatus) and the experiment was started, and the experimental results are shown in table 3.
TABLE 3 temperature resistance test of materials
4. And (3) evaluating the synergy of the bridging material:
(1) laboratory apparatus
QD-2 type plugging material test device.
(2) Sample slurry preparation method
Base slurry: 3000ml of distilled water is measured, 240.0g of bentonite and 3g of sodium carbonate (accurate to 0.01g) are added under the stirring condition of a low-speed stirrer, stirring is carried out for 1 hour cumulatively, and the mixture is sealed and maintained for 16 hours at room temperature for standby.
Test slurry: 3000ml of base slurry is taken, 75.0g of bridging synergist sample, 150.0g (1mm) of walnut shell and 150.0g of mica sheet (1mm) are sequentially added, and stirring is carried out for 30 min.
(3) The test method comprises the following steps:
mounting a 2mm seam plate on an inner step of a ball valve joint of a QD-2 type leaking stoppage material testing device, screwing an outlet elbow, opening a ball valve, and placing a liquid receiving container below the outlet; injecting 3000ml of prepared test slurry into a plugging material device, screwing a tank cover, connecting a pressurizing pipeline, opening a discharge port, opening an air source to pressurize, adding 0.7MPa of pressure, stabilizing the pressure for 15min, then increasing the pressure of 0.5MPa every 30s until the pressure is increased to 10MPa, and stopping pressurizing after stabilizing the pressure for 30 min.
(4) Determination method
And measuring the filtration loss of the filtrate, wherein the filtrate loss is qualified when the filtrate loss is less than 1000 ml.
The results of the synergistic comparison evaluation of the bridging materials are shown in table 4, compared with other bridging materials, such as reite fiber, bamboo fiber, cotton seed hulls and asbestos fiber.
TABLE 4 evaluation table for synergistic effect of bridging material
The experiments show that: the bridging synergist which is not added in the embodiment of the invention is completely lost in the pressurizing process; the plugging slurry added with the bridging and plugging synergist in the embodiment can be easily pressurized to 10MPa and stabilized for 30min, and the leakage loss is far lower than 1000 ml.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The bridging synergist for the drilling fluid is characterized by comprising the following components in percentage by mass:
20-40% of wood fiber, 35-40% of inorganic mineral fiber, 20-30% of inorganic rigid particle and 5-10% of inorganic reinforcing agent; the inorganic rigid particles are resin sand with the particle size of 200 meshes or a compound of the resin sand and ceramic powder; the inorganic mineral fiber is the combination of brucite fiber, aluminum silicate fiber and carbon fiber; wherein the length of the brucite fiber is 1-3 mm, the diameter is 0.5-16 um, the length of the aluminum silicate fiber is 2-4 mm, the diameter is 0.7-20 um, the length of the carbon fiber is 1-4 mm, and the diameter is 0.5-18 um; the mass ratio of the brucite fibers to the aluminum silicate fibers to the carbon fibers is 5:4: 1.
2. The bridging synergist for drilling fluid according to claim 1, wherein the wood fiber is pine fiber or poplar fiber with a length of 1-3 mm and a diameter of 0.5-15 um, or a compound of the two.
3. The bridging synergist for drilling fluid according to claim 1, wherein the ceramic powder is a compound with three particle sizes of 2500 meshes, 1500 meshes and 800 meshes.
4. The bridging synergist for the drilling fluid according to claim 3, wherein the compounding mass ratio of 2500-mesh ceramic powder, 1500-mesh ceramic powder and 800-mesh ceramic powder is (4-5): (2-4): (1-3).
5. The bridging synergist for drilling fluid according to claim 1, wherein the inorganic reinforcing agent is aluminum slag with a particle size of 300 meshes.
6. The bridging synergist for the drilling fluid as claimed in claim 5, wherein the mass ratio of each component is as follows: 30% of wood fiber, 40% of inorganic mineral fiber, 25% of resin sand and 5% of inorganic reinforcing agent.
7. The bridging synergist for the drilling fluid as claimed in claim 5, wherein the mass ratio of each component is as follows: 40% of wood fiber, 30% of inorganic mineral fiber, 20% of compound of resin sand and ceramic powder in mass ratio and 10% of inorganic reinforcing agent.
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