CN105419758A - Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof - Google Patents
Well cementation flushing liquid system suitable for oil-based drilling fluid and preparation method thereof Download PDFInfo
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- 239000012530 fluid Substances 0.000 title claims abstract description 110
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 74
- 238000005553 drilling Methods 0.000 title claims abstract description 67
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 239000007788 liquid Substances 0.000 title abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229920000642 polymer Polymers 0.000 claims abstract description 14
- 150000003839 salts Chemical class 0.000 claims abstract description 12
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 10
- 239000002736 nonionic surfactant Substances 0.000 claims abstract description 9
- 239000003945 anionic surfactant Substances 0.000 claims abstract description 8
- 239000004064 cosurfactant Substances 0.000 claims abstract description 7
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 10
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 claims description 9
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical compound CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- LRHPLDYGYMQRHN-UHFFFAOYSA-N N-Butanol Chemical compound CCCCO LRHPLDYGYMQRHN-UHFFFAOYSA-N 0.000 claims description 7
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 claims description 7
- 239000000243 solution Substances 0.000 claims description 7
- 239000007864 aqueous solution Substances 0.000 claims description 6
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 6
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 6
- 239000001103 potassium chloride Substances 0.000 claims description 6
- 235000011164 potassium chloride Nutrition 0.000 claims description 6
- 239000011780 sodium chloride Substances 0.000 claims description 6
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 5
- 239000006004 Quartz sand Substances 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 5
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 5
- 239000012267 brine Substances 0.000 claims description 5
- 229920003090 carboxymethyl hydroxyethyl cellulose Polymers 0.000 claims description 5
- -1 polyol ester Chemical class 0.000 claims description 5
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 5
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 claims description 5
- 239000004094 surface-active agent Substances 0.000 claims description 5
- ARXJGSRGQADJSQ-UHFFFAOYSA-N 1-methoxypropan-2-ol Chemical compound COCC(C)O ARXJGSRGQADJSQ-UHFFFAOYSA-N 0.000 claims description 4
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 4
- AMQJEAYHLZJPGS-UHFFFAOYSA-N N-Pentanol Chemical compound CCCCCO AMQJEAYHLZJPGS-UHFFFAOYSA-N 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000004530 micro-emulsion Substances 0.000 claims description 4
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000843 powder Substances 0.000 claims description 4
- BDERNNFJNOPAEC-UHFFFAOYSA-N propan-1-ol Chemical compound CCCO BDERNNFJNOPAEC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- RWNUSVWFHDHRCJ-UHFFFAOYSA-N 1-butoxypropan-2-ol Chemical compound CCCCOCC(C)O RWNUSVWFHDHRCJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052601 baryte Inorganic materials 0.000 claims description 3
- 239000010428 baryte Substances 0.000 claims description 3
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920005862 polyol Polymers 0.000 claims description 3
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 claims description 3
- POAOYUHQDCAZBD-UHFFFAOYSA-N 2-butoxyethanol Chemical compound CCCCOCCO POAOYUHQDCAZBD-UHFFFAOYSA-N 0.000 claims description 2
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 claims description 2
- 229920001214 Polysorbate 60 Polymers 0.000 claims description 2
- 150000002191 fatty alcohols Chemical class 0.000 claims description 2
- 229940088644 n,n-dimethylacrylamide Drugs 0.000 claims description 2
- YLGYACDQVQQZSW-UHFFFAOYSA-N n,n-dimethylprop-2-enamide Chemical compound CN(C)C(=O)C=C YLGYACDQVQQZSW-UHFFFAOYSA-N 0.000 claims description 2
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 claims description 2
- 235000010482 polyoxyethylene sorbitan monooleate Nutrition 0.000 claims description 2
- 229920000053 polysorbate 80 Polymers 0.000 claims description 2
- 239000000230 xanthan gum Substances 0.000 claims description 2
- 229920001285 xanthan gum Polymers 0.000 claims description 2
- 235000010493 xanthan gum Nutrition 0.000 claims description 2
- 229940082509 xanthan gum Drugs 0.000 claims description 2
- 238000009736 wetting Methods 0.000 abstract description 11
- 239000004568 cement Substances 0.000 abstract description 6
- 230000007547 defect Effects 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 66
- 239000012065 filter cake Substances 0.000 description 9
- 239000003995 emulsifying agent Substances 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 3
- 229910001628 calcium chloride Inorganic materials 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 238000011156 evaluation Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000007908 nanoemulsion Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000000518 rheometry Methods 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000003109 Disodium ethylene diamine tetraacetate Substances 0.000 description 1
- ZGTMUACCHSMWAC-UHFFFAOYSA-L EDTA disodium salt (anhydrous) Chemical compound [Na+].[Na+].OC(=O)CN(CC([O-])=O)CCN(CC(O)=O)CC([O-])=O ZGTMUACCHSMWAC-UHFFFAOYSA-L 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 239000002202 Polyethylene glycol Substances 0.000 description 1
- 208000035389 Ring chromosome 6 syndrome Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 125000000217 alkyl group Chemical group 0.000 description 1
- 239000002199 base oil Substances 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 239000002738 chelating agent Substances 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 235000019301 disodium ethylene diamine tetraacetate Nutrition 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- JBTWLSYIZRCDFO-UHFFFAOYSA-N ethyl methyl carbonate Chemical compound CCOC(=O)OC JBTWLSYIZRCDFO-UHFFFAOYSA-N 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- 239000010440 gypsum Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 239000002563 ionic surfactant Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 229920001223 polyethylene glycol Polymers 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000012487 rinsing solution Substances 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- DAJSVUQLFFJUSX-UHFFFAOYSA-M sodium;dodecane-1-sulfonate Chemical compound [Na+].CCCCCCCCCCCCS([O-])(=O)=O DAJSVUQLFFJUSX-UHFFFAOYSA-M 0.000 description 1
- 238000005063 solubilization Methods 0.000 description 1
- 230000007928 solubilization Effects 0.000 description 1
- 239000000080 wetting agent Substances 0.000 description 1
Classifications
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- 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
A well cementation flushing liquid system suitable for an oil-based drilling fluid and a preparation method thereof. The invention mainly solves the defects of low flushing efficiency, poor wetting conversion capability and poor interface cementing quality in the flushing liquids in the prior art. The flushing liquid system comprises the following components, by weight: 100 parts of clear water, 0.8-1.2 parts of an anionic surfactant, 0.6-0.8 parts of a nonionic surfactant, 0.7-1.0 part of a cosurfactant, 6.0-10.0 parts of an oil phase, 8.0-12.0 parts of a salt water phase, 0.15-5.0 parts of a polymer, 0.0-150 parts of a weighting agent and 1.0-2.5 parts of salt. The flushing liquid system is adjustable in density within 1.01-1.90 g/cm<3> and is 20-130 DEG C in available temperature range. The flushing liquid system can quickly remove residual oil-based drilling fluid, is strong in wetting conversion capability, ensures cementation between cement rings and an annular space, and is wide in application prospect.
Description
Technical Field
The invention relates to the field of oil and gas well cementation, in particular to a well cementation flushing fluid system suitable for oil-based drilling fluid and a preparation method thereof, which are particularly suitable for flushing the oil-based drilling fluid before well cementation so as to improve the cementing quality of a well cementation interface.
Background
The oil-based drilling fluid has strong pollution resistance, stable performance, strong inhibition and good lubricity, is beneficial to keeping the well wall stable, can protect an oil-gas layer to the maximum extent, and is increasingly applied to the complex strata such as shale, a salt-gypsum layer and the like and the special drilling construction of deep wells, extended reach wells and the like year by year. However, in cementing oil and gas wells, oil-based drilling fluids can adversely affect the quality of the cementing: the oil-based drilling fluid has high viscosity and strong adhesion capability, so that the casing and the well wall are difficult to wash; the oil-based drilling fluid forms a compact filter cake on a well wall and is difficult to be effectively washed by a washing fluid, so that a micro annular space is formed at an annular interface of a well hole; the oil-based drilling fluid can make the well wall and the casing wall become oleophilic, and the cementing quality of cement paste and the interface of the well wall and the casing is influenced. Due to the reasons, the cementing strength of the first and second interfaces of the well cementation is reduced, the well cementation quality is seriously influenced, and even oil, gas and water channeling possibly occurs. For years, the difficulty of well cementation engineering is how to effectively remove residual oil-based drilling fluid and filter cakes and ensure the water wettability of a casing and a well wall.
A great deal of research is carried out at home and abroad on flushing liquid suitable for oil-based drilling fluid. For example, the flushing liquid for oil-based drilling fluid well cementation disclosed in CN1174075C mainly comprises polyethylene glycol ester, water wetting agent alkylphenol polyoxyethylene ether and base oil phase, and the flushing liquid can effectively flush residual oil-based drilling fluid and filter cake, and has better dilution and viscosity reduction effects on the oil-based drilling fluid. CN1405265A discloses an oil-based drilling fluid flushing fluid and a preparation method thereof, which are mainly used for solving the problem of low two-interface cementing strength, and the main active components of the flushing fluid are chelating agent disodium ethylene diamine tetraacetate, surfactant sodium dodecyl sulfate and alkyl fatty alcohol polyoxyethylene ether. CN103555306A discloses an oil-based drilling fluid flushing fluid suitable for high-temperature and high-salt environments, which mainly comprises the following active ingredients of an ionic surfactant AES and a nonionic surfactant laurinol polyoxyethylene ether, and the system has higher salt concentration and can resist higher temperature. Yuekengsheng et al developed a filter cake remover HCF for oil-based drilling fluids, which is a relatively stable oil-in-water emulsion system in which the water phase consists of mixed acid, cleaning penetrant, clay stabilizer, corrosion inhibitor, emulsifier, antiscaling agent, etc. Wang 32704m and the like develop a flushing fluid BCS-020L suitable for oil-based drilling fluid, and has better flushing capability and wetting reversal capability. U.S. Pat. No. 6,686,323 discloses a rinsing solution, which is a mixture of alkyl polyglucoside surfactant and ester solvent. Ryan et al of Harliberton, Inc. and Jonathan et al of Beckhous, Inc. both propose to apply the microemulsion technology to a well cementing flushing fluid for cleaning residual oil-based drilling fluid in a well bore, and a certain achievement is preliminarily obtained.
At present, effective flushing of oil-based drilling fluid and filter cake adhered to an interface and efficient wetting reversal of the interface are generally considered as key factors for improving the interface cementing quality under the condition of the oil-based drilling fluid. The well cementation flushing fluid system for the oil-based drilling fluid researched and developed at present mainly takes a polymer and a surfactant solution as main materials, has the defects of weak wetting reversal capacity, incapability of efficiently cleaning the drilling fluid and a filter cake on a well wall and the like, and is difficult to meet the well cementation requirement. Therefore, the research on the high-efficiency well cementation flushing fluid applicable to the oil-based drilling fluid has remarkable market benefit.
Disclosure of Invention
The invention aims to overcome the defects of low flushing efficiency and poor interface cementing quality of the conventional well cementing flushing fluid on an oil-based drilling fluid, and provides a well cementing flushing fluid system suitable for the oil-based drilling fluid and a preparation method thereof. The flushing fluid system is prepared by diluting microemulsion into nanoemulsion, and adding polymer, weighting agent, dispersant, stabilizer and the like to prepare the flushing fluid with the density of 1.01g/cm3～1.90g/cm3The temperature range of the washing liquid can reach 20-130 ℃. The nano emulsion in the well cementation flushing fluid has the performances of penetration, dissolution, solubilization, carrying and the like, can quickly and efficiently remove residual oil-based drilling fluid, has better compatibility with the oil-based drilling fluid, has good wetting modification effect on an annular interface, is favorable for promoting the cementation of a cement ring and the annular interface,has the advantages of simple field construction and obviously improved well cementation quality.
In order to achieve the purpose, the well cementation flushing fluid system comprises the following components in parts by mass:
100 parts of clear water;
0.8-1.2 parts of anionic surfactant;
0.6-0.8 part of nonionic surfactant;
0.7-1.0 part of cosurfactant;
6.0-10.0 parts of an oil phase;
8.0-12.0 parts of a brine phase;
0.15-5.0 parts of a polymer;
0.0-150 parts of weighting agent;
1.0-2.5 parts of salt.
The anionic surfactant may be one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfonate and sodium dodecyl sulfate.
The nonionic surfactant can be one of fatty alcohol polyoxyethylene ether AEO-3, AEO-5, AEO-9 or polyol ester Tween40, Tween60 and Tween 80.
The cosurfactant can be one of n-propanol, n-butanol, n-pentanol, propylene glycol butyl ether, propylene glycol methyl ether and ethylene glycol butyl ether.
The oil phase can be one of n-hexane, n-heptane, n-octane and cyclohexane.
The brine phase can be one of sodium chloride aqueous solution and potassium chloride aqueous solution, and the mass percentage concentration is 1.5-3.0%.
The polymer can be one or more of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and N, N-Dimethylacrylamide (DMAA) polymer, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and Acrylamide (AM) polymer, carboxymethyl hydroxyethyl cellulose (CMHEC), polyvinyl alcohol (PVA) and xanthan gum.
The weighting agent can be one or a combination of several of barite powder, quartz sand and iron ore powder, the grain size of the barite is 25-48 mu m, the grain size of the quartz sand is 58-106 mu m, and the grain size of the iron ore powder is 10-37 mu m.
The salt may be one of potassium chloride and sodium chloride.
The preparation method of the flushing fluid system suitable for the oil-based drilling fluid comprises the following steps:
adding 8.0-12 parts of a salt water phase into a slurry cup, then adding 0.6-0.8 part of a nonionic surfactant and 0.8-1.2 parts of an anionic surfactant, uniformly stirring at a certain rotating speed, adding 6-10 parts of an oil phase, then adding 0.7-1.0 part of a cosurfactant, standing for 1-3 hours, and spontaneously forming a stable microemulsion by the system; adding 100 parts of clear water into the other pulp cup, adding 1.0-2.5 parts of salt, adding 0.15-5.0 parts of polymer after the salt is completely dissolved, stirring at a high speed of 800-1200 r/min for 10-30 min, then stirring at a low speed of 150-300 r/min for 1h, then adding 0.0-150 parts of weighting agent, and stirring uniformly; and mixing the two solutions, and stirring for 1-3 min at the speed of 800-3000 r/min to obtain the well cementation flushing fluid system suitable for the oil-based drilling fluid.
The invention has the advantages that: (1) the short-chain alcohol can be dissolved in the oil phase and the water phase at the same time, has a certain modification effect on the oil phase and the water phase, can effectively reduce the interfacial tension between the oil phase and the water phase, and is beneficial to increasing the flushing capacity of the oil; (2) the flushing liquid has a large amount of micelles, so that a large amount of oil can be solubilized and dissolved in water, and the flushing capacity and the oil carrying capacity are improved; (3) the surfactant in the flushing fluid can spread on the oil-wet well wall and the casing interface to be water-wet, so that the oil-based drilling fluid is more difficult to adhere to the surface of the oil-based drilling fluid and is easier to flush, and a proper and clean environment is provided for cementing cement slurry; (4) the interface area is increased due to the nano-droplet structure in the flushing liquid, the contact efficiency of the flushing liquid and the oil-based drilling fluid is increased, and the oil-based drilling fluid can be effectively cleaned; (5) the nano emulsion has small particle size, can permeate into a filter cake, accelerates the destruction and dissolution of the filter cake, and improves the flushing effect on the filter cake.
The invention provides a flushing fluid system which has reliable principle, simple preparation and low cost and can meet the requirements of on-site well cementation, the flushing fluid system overcomes the defects of low well cementation flushing efficiency and poor wetting reversal capability of the existing oil-based drilling fluid, and the density is 1.01g/cm3～1.90g/cm3The temperature range of the well cementation flushing operation can reach 20-130 ℃.
Detailed Description
Example 1: composition of well cementation flushing fluid system suitable for oil-based drilling fluid
A well cementation flushing fluid system suitable for an oil-based drilling fluid can be composed of the following substances in parts by mass: 100 parts of clean water, 1 part of sodium dodecyl benzene sulfonate serving as an anionic surfactant, 90.7 parts of fatty alcohol-polyoxyethylene ether AEO-serving as a nonionic surfactant, 0.7 part of n-butyl alcohol serving as a cosurfactant, 7 parts of n-heptane serving as an oil phase, 9 parts of a potassium chloride aqueous solution serving as a brine phase, 3 parts of carboxymethyl hydroxyethyl cellulose serving as a polymer, 32 parts of quartz sand serving as a weighting agent and 2 parts of potassium chloride, wherein the density of flushing fluid is 1.2g/cm3。
Example 2: composition of well cementation flushing fluid system suitable for oil-based drilling fluid
A well cementation flushing fluid system suitable for an oil-based drilling fluid can be composed of the following substances in parts by mass: 100 parts of clear water, 0.8 part of anionic surfactant sodium dodecyl sulfate, 800.6 parts of nonionic surfactant polyol ester tween, 0.8 part of cosurfactant propylene glycol monobutyl ether, and an oil phase ring6 parts of hexane, 8 parts of brine phase sodium chloride aqueous solution, 5 parts of polymer polyvinyl alcohol, 94 parts of weighting agent barite and 2 parts of sodium chloride, wherein the density of flushing liquid is 1.7g/cm3。
Example 3: compatible rheology evaluation of rinse solution systems
The method comprises the steps of taking the flushing liquid system in example 1 as a test object, firstly preparing a flushing liquid, then evaluating compatible rheological properties according to the standard SY/T5374-2000 'oil and gas well cementing pad fluid using method', mixing the drilling liquid/the flushing liquid according to the proportion of 95/5, 75/25, 50/50, 25/75 and 5/95, measuring the rheological properties by using a six-speed viscometer, comparing the rheological properties with the drilling liquid which is not mixed with the flushing liquid, and testing the temperature at 70 ℃. The formula of the adopted oil-based drilling fluid comprises: white oil, 1.5 percent of VG-69 organic soil, 0.5 percent of LCR-01D main emulsifier, 3 percent of filtrate reducer, 25 percent of water, 5 percent of calcium chloride and 0.5 percent of auxiliary emulsifier, and the density of the drilling fluid is 1.30g/cm3. The test results are shown in Table 1.
TABLE 1 compatible rheology of cementing wash fluid systems
Wherein,PV＝Ф600-Ф300；n＝3.32lg(Ф600/Ф300)；k＝(0.511Ф600)/1022n。
example 4: evaluation of rinsing Rate of rinsing fluid System
The flushing liquid in example 1 is taken as a test object, firstly, a flushing liquid is prepared, and then, the flushing efficiency is evaluated according to the using method of the oil and gas well cementing pad liquid in the oil and gas well industry standard SY/T5374-2000 of the people's republic of China, the rotating speed is 1400 revolutions per minute, and the flushing time is 5 minutes. The formula of the adopted oil-based drilling fluid comprises: white oil, 1.5 percent of VG-69 organic soil, 0.5 percent of LCR-01D main emulsifier, 3 percent of filtrate reducer, 25 percent of water, 5 percent of calcium chloride and 0.5 percent of auxiliary emulsifier, and the density of the drilling fluid is 1.30g/cm3. The test results are shown in Table 2.
TABLE 2 rinse rate of rinse solution system
Wherein the washing rate
Example 5: evaluation of wetting reversal performance of flushing fluid system on cemented surface
A rinse solution was first prepared using the rinse solution of example 1 as a test object. The experimental method for the pollution of the well cementation interface comprises the following steps: adopting a simulated wellbore method, according to the national standard GB/T16783.2-2012 'drilling fluid field test part 2, oil-based drilling fluid', carrying out a 30-minute pollution experiment of the oil-based drilling fluid under the conditions of a certain temperature and 3.5MPa, and using the oil-based drilling fluid to carry out a casing (a first well cementation interface) and a core (a second well cementation interface)) And (4) carrying out pollution. The well cementation interface flushing experimental method comprises the following steps: a simulated shaft method is adopted, a well cementation flushing fluid system is used for flushing a sleeve and a rock core under the conditions of a certain temperature and 3.5MPa, according to the using method of a cementing pad fluid of an oil and gas well of the oil and gas industry standard SY/T5374-2000 of the people's republic of China, the backflow speed of the flushing fluid is 0.5m/s, and the flushing time is 10 min. Wetting angle was measured using a DSA100 optical contact angle gauge. The method for measuring the interface bond strength comprises the following steps: and (3) placing the sleeve and the core into a mold, injecting cement paste, curing in a water bath at 70 ℃ for 24 hours, and measuring the interface cementing strength by using a press machine. The formula of the adopted oil-based drilling fluid comprises: white oil, 1.5 percent of VG-69 organic soil, 0.5 percent of LCR-01D main emulsifier, 3 percent of filtrate reducer, 25 percent of water, 5 percent of calcium chloride and 0.5 percent of auxiliary emulsifier, and the density of the drilling fluid is 1.30g/cm3. The results are shown in Table 3.
TABLE 3 wetting reversal behavior of well cementing flushing fluid system on cementing surface
As can be seen from tables 1, 2 and 3, the flushing fluid system of the present invention has good compatibility with drilling fluid, can clean oil-based drilling fluid in a short time, has high flushing efficiency and temperature resistance, is hydrophilic in both interfaces after flushing the first and second interfaces of well cementation, has good wetting reversal performance, provides a suitable environment for cementing cement slurry, ensures the interface cementing strength, and is very helpful for improving the cementing quality of the well cementation interface and the well cementation quality.
It should be understood, however, that the above description is only one embodiment of the present invention, and it should be understood that a person skilled in the art may make several modifications and improvements without departing from the principle of the present invention, and the modifications and improvements are within the protection scope of the appended claims.
Claims (10)
1. A well cementation flushing fluid system suitable for an oil-based drilling fluid is characterized by comprising the following components in percentage by weight:
2. a cementing flushing fluid system suitable for oil-based drilling fluids according to claim 1, characterized by the preparation method: adding 8.0-12 parts of a salt water phase into a slurry cup, then adding 0.6-0.8 part of a nonionic surfactant and 0.8-1.2 parts of an anionic surfactant, uniformly stirring at a certain rotating speed, adding 6-10 parts of an oil phase, then adding 0.7-1.0 part of a cosurfactant, standing for 1-3 hours, and spontaneously forming a stable microemulsion by the system; adding 100 parts of clear water into the other pulp cup, adding 1.0-2.5 parts of salt, adding 0.15-5.0 parts of polymer after the salt is completely dissolved, stirring at a high speed of 800-1200 r/min for 10-30 min, then stirring at a low speed of 150-300 r/min for 1h, then adding 0.0-150 parts of weighting agent, and stirring uniformly; and mixing the two solutions, and stirring for 1-3 min at the speed of 800-3000 r/min to obtain the well cementation flushing fluid system suitable for the oil-based drilling fluid.
3. The cementing flush fluid system for oil-based drilling fluids of claim 1, wherein the anionic surfactant is one of sodium dodecylbenzene sulfonate, sodium dodecyl sulfate, and sodium dodecyl sulfate.
4. The cementing flush fluid system suitable for oil-based drilling fluids of claim 1, wherein the non-ionic surfactant may be one of fatty alcohol polyoxyethylene ether AEO-3, AEO-5, AEO-9 or polyol ester Tween40, Tween60, Tween 80.
5. A well cementation flushing fluid system suitable for use with an oil based drilling fluid according to claim 1, characterised in that the co-surfactant may be one of n-propanol, n-butanol, n-pentanol, propylene glycol butyl ether, propylene glycol methyl ether, ethylene glycol butyl ether.
6. A well cementation flushing fluid system suitable for use with an oil based drilling fluid according to claim 1, characterized in that the oil phase may be one of n-hexane, n-heptane, n-octane, cyclohexane.
7. A well cementation flushing fluid system suitable for an oil-based drilling fluid as claimed in claim 1, characterized in that the brine phase may be one of a sodium chloride aqueous solution and a potassium chloride aqueous solution, and the concentration by mass percentage is 1.5-3.0%.
8. The cementing flushing fluid system for oil-based drilling fluids of claim 1, wherein the polymer is one or more of 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and N, N-Dimethylacrylamide (DMAA) polymer, 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) and Acrylamide (AM) polymer, carboxymethyl hydroxyethyl cellulose (CMHEC), polyvinyl alcohol (PVA), xanthan gum.
9. A well cementation flushing fluid system suitable for oil-based drilling fluid according to claim 1, characterized in that the weighting agent can be one or a combination of several of barite powder, quartz sand and iron ore powder, the grain size of the barite is 25-48 μm, the grain size of the quartz sand is 58-106 μm, and the grain size of the iron ore powder is 10-37 μm.
10. The cementing flush fluid system suitable for oil-based drilling fluids of claim 1, wherein the salt may be one of potassium chloride, sodium chloride.
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