CN115873571B - Plugging and channeling-preventing cleaning liquid - Google Patents
Plugging and channeling-preventing cleaning liquid Download PDFInfo
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- CN115873571B CN115873571B CN202110976473.5A CN202110976473A CN115873571B CN 115873571 B CN115873571 B CN 115873571B CN 202110976473 A CN202110976473 A CN 202110976473A CN 115873571 B CN115873571 B CN 115873571B
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- plugging
- channeling
- preventing cleaning
- latex
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- 238000004140 cleaning Methods 0.000 title claims abstract description 65
- 239000007788 liquid Substances 0.000 title claims abstract description 42
- 239000004816 latex Substances 0.000 claims abstract description 26
- 229920000126 latex Polymers 0.000 claims abstract description 26
- 238000002156 mixing Methods 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000000463 material Substances 0.000 claims abstract description 17
- 239000004094 surface-active agent Substances 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 11
- 239000013530 defoamer Substances 0.000 claims abstract description 6
- 239000002518 antifoaming agent Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims description 16
- -1 sodium alkyl benzene Chemical class 0.000 claims description 12
- 239000005062 Polybutadiene Substances 0.000 claims description 9
- 229920002522 Wood fibre Polymers 0.000 claims description 9
- 239000004205 dimethyl polysiloxane Substances 0.000 claims description 9
- YIBPLYRWHCQZEB-UHFFFAOYSA-N formaldehyde;propan-2-one Chemical group O=C.CC(C)=O YIBPLYRWHCQZEB-UHFFFAOYSA-N 0.000 claims description 9
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 claims description 9
- 229920002857 polybutadiene Polymers 0.000 claims description 9
- 239000002025 wood fiber Substances 0.000 claims description 9
- 239000010425 asbestos Substances 0.000 claims description 6
- 239000010426 asphalt Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 229910052895 riebeckite Inorganic materials 0.000 claims description 6
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 5
- 229920001732 Lignosulfonate Polymers 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
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 5
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 5
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 239000003365 glass fiber Substances 0.000 claims description 5
- 239000011118 polyvinyl acetate Substances 0.000 claims description 5
- 229920002689 polyvinyl acetate Polymers 0.000 claims description 5
- 229910052708 sodium Inorganic materials 0.000 claims description 5
- 239000011734 sodium Substances 0.000 claims description 5
- 235000019333 sodium laurylsulphate Nutrition 0.000 claims description 5
- 239000002318 adhesion promoter Substances 0.000 claims description 3
- 229940077388 benzenesulfonate Drugs 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 17
- 230000005465 channeling Effects 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 10
- 238000005553 drilling Methods 0.000 abstract description 9
- 239000002994 raw material Substances 0.000 abstract description 7
- 230000002265 prevention Effects 0.000 abstract description 5
- 239000000243 solution Substances 0.000 description 20
- 238000000034 method Methods 0.000 description 7
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 6
- 238000006073 displacement reaction Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000005060 rubber Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000010445 mica Substances 0.000 description 1
- 229910052618 mica group Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
Abstract
The invention relates to the technical field of drilling cleaning fluid, in particular to a plugging and channeling-preventing cleaning fluid, which is prepared from plugging materials, a surfactant, latex, a tackifier, a dispersing agent, a defoaming agent and water by the following steps: adding tackifier and defoamer into water, mixing and stirring, then adding latex, dispersant and surfactant, mixing and stirring to obtain a base liquid of the plugging and channeling-preventing cleaning liquid, adding plugging material into the base liquid of the plugging and channeling-preventing cleaning liquid, mixing and stirring to obtain the plugging and channeling-preventing cleaning liquid. According to the invention, the surfactant, the plugging material and the latex are added into the raw materials, so that the plugging and channeling-preventing cleaning liquid has the effects of cleaning, plugging and channeling prevention in a water-based drilling fluid environment, and finally, the purpose of improving the well cementation quality is achieved.
Description
Technical Field
The invention relates to the technical field of drilling cleaning liquid, in particular to a plugging and channeling-preventing cleaning liquid.
Background
Currently, worldwide, the volume of unconventional oil and gas resources has exceeded the volume of conventional oil and gas resources, wherein the development of low pressure penetrating oil and gas, coalbed methane and shale gas has changed the world's oil and gas resource distribution. Along with the development of unconventional oil and gas resources, the problems of low pressure, easy leakage, high gas measurement value and the like are frequently encountered in the drilling process, and are generally solved by technical means such as drilling fluid leakage blocking, underbalanced technology and the like, but after entering a well cementation process, the leakage blocking and channeling preventing means cannot meet the well cementation requirements due to the requirements of well cementation process, and if the problems of leakage and gas channeling in the well cementation process cannot be effectively solved, the problem of low well cementation quality is possibly caused, and engineering accidents are possibly caused when serious. Therefore, how to effectively solve the problems of low pressure and easy leakage of the underground sealing layer and high gas measurement value is an important precondition for improving the well cementation sound amplitude and ensuring the well cementation quality.
Disclosure of Invention
The invention provides a plugging and channeling-preventing cleaning solution, which overcomes the defects of the prior art and can effectively solve the problems of leakage and gas channeling in the conventional well cementation process.
The technical scheme of the invention is realized by the following measures: the plugging and channeling-preventing cleaning liquid comprises, by weight, 2 to 8 parts of plugging materials, 4 to 10 parts of surfactants, 5 to 30 parts of latex, 2 to 4 parts of adhesion promoters, 0.2 to 0.5 part of dispersing agents, 0.5 part of defoaming agents and 100 parts of water.
The following are further optimizations and/or improvements to one of the above-described inventive solutions:
the plugging material is more than two of asbestos, wood fiber, organic fiber, glass fiber and sulfonated asphalt powder.
The surfactant is at least one of sodium alkyl benzene sulfonate, sodium laurylsulfate and lignosulfonate.
The tackifier is one or more of temperature roller glue, polyvinyl acetate and carboxymethyl cellulose.
The latex is polybutadiene latex.
The dispersing agent is sulfonated acetone formaldehyde polycondensate.
The volume ratio of the defoamer is 6 to 8:2 to 4 and polydimethylsiloxane.
The plugging and channeling-preventing cleaning liquid is prepared by the following steps: firstly, adding a required amount of tackifier and defoamer into a required amount of water, mixing and stirring for 3 to 5 minutes, then adding a required amount of latex, a dispersant and a surfactant, mixing and stirring for 3 to 5 minutes, and obtaining a base liquid of the plugging and channeling-preventing cleaning liquid; and secondly, adding a required amount of plugging material into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 3 to 5 minutes to obtain the plugging and channeling-preventing cleaning solution.
The invention has the beneficial effects that:
(1) According to the invention, the plugging material is added, and is inert, so that the plugging material does not participate in slurry reaction. The plugging material is a mixture of two or more of asbestos, wood fibers containing similar mica, several synthetic fibers and sulfonated asphalt powder, has good flexibility and elasticity, strong deformability and high tensile strength, is easy to disperse, plays a suspension role in plugging slurry, is crisscrossed and mutually pulled, forms a plugging grid structure on the surface of a leaking layer, can achieve good effects of uniformly dispersing and effectively plugging cracks, and simultaneously is easy to scrape a broken mud cake on a well wall and a casing, so that a good well foundation is laid for improving the well cementation quality;
(2) According to the invention, the surfactant is added to participate in the reaction in the lipophilic stratum environment, so that the oil wetting of the contact surface is reversed to achieve the effect of water wetting, thereby improving the oil displacement efficiency and enabling the oil displacement efficiency (cleaning efficiency) to be more than 93%;
(3) According to the invention, the tackifier is added and can react with water to form a polymer chain, and the stability of the slurry is improved by a chemical method, so that the temperature resistance of the slurry reaches 130 ℃;
(4) The latex is added to contact with solid particles and solid interfaces, so that the latex has strong film forming property, and atoms in the latex are attached under the action of charges after film forming, so that the effect of blocking stratum gas is achieved, and the purpose of preventing gas channeling is achieved;
(5) The basic performance of the invention can meet the well cementation technical requirement, and has the characteristics of cleaning, plugging and gas channeling prevention;
(6) The invention has good compatibility with slurry and cement paste and obvious effect on improving displacement efficiency.
In a word, the surfactant, the plugging material and the latex are added into the raw materials, so that the plugging and channeling-preventing cleaning liquid has the effects of cleaning, plugging and channeling prevention in a water-based drilling fluid environment, and finally, the purpose of improving the well cementation quality is achieved.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments can be determined according to the technical scheme and practical situations of the present invention. The various chemical reagents and chemicals mentioned in the present invention are all commonly known in the art unless specifically stated otherwise.
The invention is further described below with reference to examples:
example 1: the plugging and channeling-preventing cleaning liquid comprises, by weight, 2 to 8 parts of plugging materials, 4 to 10 parts of surfactants, 5 to 30 parts of latex, 2 to 4 parts of adhesion promoters, 0.2 to 0.5 part of dispersing agents, 0.5 part of defoaming agents and 100 parts of water.
The plugging material is more than two of asbestos, wood fiber, organic fiber, glass fiber and sulfonated asphalt powder.
The surfactant is at least one of sodium alkyl benzene sulfonate, sodium laurylsulfate and lignosulfonate.
The tackifier is one or more of temperature roller glue, polyvinyl acetate and carboxymethyl cellulose.
The latex is polybutadiene latex.
The dispersing agent is sulfonated acetone formaldehyde polycondensate.
The volume ratio of the defoamer is 6 to 8:2 to 4 and polydimethylsiloxane.
The plugging and channeling-preventing cleaning liquid is prepared by the following steps: firstly, adding a required amount of tackifier and defoamer into a required amount of water, mixing and stirring for 3 to 5 minutes, then adding a required amount of latex, a dispersant and a surfactant, mixing and stirring for 3 to 5 minutes, and obtaining a base liquid of the plugging and channeling-preventing cleaning liquid; and secondly, adding a required amount of plugging material into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 3 to 5 minutes to obtain the plugging and channeling-preventing cleaning solution.
Example 2: the plugging and channeling-preventing cleaning liquid is prepared from the following raw materials of 2g of a mixture of asbestos and wood fibers, 4g of sodium alkylbenzenesulfonate, 5g of polybutadiene latex, 2g of hotplate rubber, 0.2g of sulfonated acetone formaldehyde polycondensate, 0.5g of a mixture of tributyl phosphate and polydimethylsiloxane (volume ratio is 6:2) and 100g of water by the following steps: firstly, adding a mixture of a required amount of hotplate rubber, tributyl phosphate and polydimethylsiloxane into a required amount of water, mixing and stirring for 3min, and then adding a required amount of polybutadiene latex, sulfonated acetone formaldehyde polycondensate and sodium alkylbenzenesulfonate, mixing and stirring for 3min to obtain a base liquid of the plugging and channeling-preventing cleaning liquid; and secondly, adding the mixture of asbestos and wood fibers with the required amount into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 3min to obtain the plugging and channeling-preventing cleaning solution.
Example 3: the plugging and channeling-preventing cleaning liquid is prepared from the following raw materials of 4g of a mixture of glass fibers and sulfonated asphalt powder, 6g of lignosulfonate, 10g of polybutadiene latex, 3g of carboxymethyl cellulose, 0.3g of sulfonated acetone formaldehyde polycondensate, 0.5g of a mixture of tributyl phosphate and polydimethylsiloxane (volume ratio is 7:3) and 100g of water by the following steps: firstly, adding a mixture of carboxymethyl cellulose, tributyl phosphate and polydimethylsiloxane into water with a required amount, mixing and stirring for 4min, and then adding polybutadiene latex, sulfonated acetone formaldehyde polycondensate and lignosulfonate with a required amount, mixing and stirring for 4min to obtain a base liquid of the plugging and channeling-preventing cleaning liquid; and secondly, adding a mixture of glass fibers and sulfonated asphalt powder with required amounts into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 4min to obtain the plugging and channeling-preventing cleaning solution.
Example 4: the plugging and channeling-preventing cleaning solution is prepared from the following raw materials of 8g of a mixture of wood fibers and organic fibers, 10g of sodium lauryl sulfate, 30g of polybutadiene latex, 4g of polyvinyl acetate, 0.5g of sulfonated acetone formaldehyde polycondensate, 0.5g of a mixture of tributyl phosphate and polydimethylsiloxane (volume ratio is 8:4) and 100g of water, wherein the raw materials are prepared by the following steps: firstly, adding a mixture of polyvinyl acetate, tributyl phosphate and polydimethylsiloxane in required amount into water in required amount, mixing and stirring for 5min, and then adding polybutadiene latex, sulfonated acetone formaldehyde polycondensate and sodium laurylsulfate in required amount, mixing and stirring for 5min to obtain a base liquid of the leak-stopping and channeling-preventing cleaning liquid; and secondly, adding a mixture of wood fibers and organic fibers with required amounts into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 5min to obtain the plugging and channeling-preventing cleaning solution.
The plugging and channeling-preventing cleaning solution obtained in the embodiments 2 to 4 of the present invention can play roles in cleaning, plugging and channeling prevention, and the following is an examination of the basic performance, cleaning efficiency, plugging effects under different pressures and crack widths, and plugging effects under different leak speeds of the plugging and channeling-preventing cleaning solution obtained in the embodiments 2 to 4 of the present invention.
Test 1: the basic performance and cleaning efficiency of the plugging and channeling-preventing cleaning liquid of the invention are examined, and the plugging effect under the conditions of different pressures and crack widths is examined.
The test method comprises the following steps: the basic performance and cleaning efficiency of the plugging and channeling-preventing cleaning liquid obtained in examples 2 to 4 of the present invention and the plugging effect under different pressure and crack width conditions were examined with reference to the method specified in GB/T29170-2012 laboratory test for drilling fluids for oil and gas industry.
Test results: as shown in Table 1, the basic performance of the plugging and channeling-preventing cleaning liquid of the invention is shown in Table 1, the apparent viscosity of the plugging and channeling-preventing cleaning liquid of the invention is 35S to 90S, and the density is 1.02g/cm 3 To 2.10g/cm 3 And the filtration loss is low. The cleaning efficiency of the plugging and channeling-preventing cleaning liquid is shown in table 2, and as can be seen from table 2, when the flushing time is 10min, the oil displacement efficiency is more than 93%, and the oil displacement effect is good. As shown in Table 3, the plugging effect of the plugging and channeling-preventing cleaning liquid under the conditions of different pressures and crack widths is shown in Table 3, and the plugging effect of the plugging and channeling-preventing cleaning liquid is better for cracks with crack widths less than or equal to 3.00mm when the pressurizing pressure is less than or equal to 1.0 MPa; when the width of the crack is 1.00mm, the invention has better plugging effect aiming at the condition that the pressurizing pressure is less than or equal to 4.0 MPa.
Test 2: the plugging effect of the plugging and channeling-preventing cleaning fluid under different leakage speed conditions is examined.
The test method comprises the following steps: putting a slit plate with a slit width of 1mm into a drilling fluid plugging instrument, adding mixed quartz sand with a mesh of 20-100 into the upper part of a slit sealing plate for 30cm, then pouring the plugging and channeling-preventing cleaning fluid obtained in the embodiment 2-4 of the invention to a height of 80cm respectively, covering a top cover, and controlling the top injection pressure. Wherein, the injection pressure corresponding to the leakage speed of 5 square/hour is 1.5MPa, the injection pressure corresponding to 10 square/hour is 3.0MPa, the injection pressure corresponding to 15 square/hour is 3.5MPa, the injection pressure corresponding to 20 square/hour is 4.5MPa, and the leakage condition of the leakage stopping and channeling preventing cleaning liquid is judged by simulating the leakage speed through different pressures and observing the liquid outlet condition of the lower part.
Test results: as shown in Table 4, the plugging and channeling-preventing cleaning liquid obtained in the embodiment 2 of the invention is applicable to low-pressure oil-prone gas wells, coal-bed gas wells and shale gas wells with the leak rate less than or equal to 5 square/hour and the gas measurement value less than 10 ten thousand PPm, the plugging and channeling-preventing cleaning liquid obtained in the embodiment 3 of the invention is applicable to low-pressure oil-prone gas wells, coal-bed gas wells and shale gas wells with the leak rate less than or equal to 10 square/hour and the gas measurement value less than 20 ten thousand PPm, and the plugging and channeling-preventing cleaning liquid obtained in the embodiment 4 of the invention is applicable to low-pressure oil-prone gas wells, coal-bed gas wells and shale gas wells with the leak rate less than or equal to 15 square/hour and the gas measurement value less than 40 ten thousand PPm.
In conclusion, the surfactant, the plugging material and the latex are added into the raw materials, so that the plugging and channeling-preventing cleaning liquid has the effects of cleaning, plugging and channeling prevention in a water-based drilling fluid environment, and finally, the purpose of improving the well cementation quality is achieved.
The technical characteristics form the embodiment of the invention, have stronger adaptability and implementation effect, and can increase or decrease unnecessary technical characteristics according to actual needs so as to meet the requirements of different situations.
Claims (2)
1. The plugging and channeling-preventing cleaning solution is characterized by comprising, by weight, 2 to 8 parts of plugging materials, 4 to 10 parts of surfactants, 5 to 30 parts of latex, 2 to 4 parts of adhesion promoters, 0.2 to 0.5 part of dispersing agents, 0.5 part of defoaming agents and 100 parts of water, wherein the plugging materials are a mixture of asbestos and wood fibers, a mixture of glass fibers and sulfonated asphalt powder or a mixture of wood fibers and organic fibers; the surfactant is more than one of sodium alkyl benzene sulfonate, sodium lauryl sulfate and lignosulfonate; the tackifier is one or more of temperature wheel glue, polyvinyl acetate and carboxymethyl cellulose; the latex is polybutadiene latex; the dispersing agent is sulfonated acetone formaldehyde polycondensate; the defoaming agent has a volume ratio of 6 to 8:2 to 4 and polydimethylsiloxane.
2. The plugging and channeling-preventing cleaning solution according to claim 1, which is characterized by being prepared by the following steps: firstly, adding a required amount of tackifier and defoamer into a required amount of water, mixing and stirring for 3 to 5 minutes, then adding a required amount of latex, a dispersant and a surfactant, mixing and stirring for 3 to 5 minutes, and obtaining a base liquid of the plugging and channeling-preventing cleaning liquid; and secondly, adding a required amount of plugging material into the base solution of the plugging and channeling-preventing cleaning solution, mixing and stirring for 3 to 5 minutes to obtain the plugging and channeling-preventing cleaning solution.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110976473.5A CN115873571B (en) | 2021-08-24 | 2021-08-24 | Plugging and channeling-preventing cleaning liquid |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110976473.5A CN115873571B (en) | 2021-08-24 | 2021-08-24 | Plugging and channeling-preventing cleaning liquid |
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| CN115873571A CN115873571A (en) | 2023-03-31 |
| CN115873571B true CN115873571B (en) | 2023-12-26 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4958685A (en) * | 1988-05-27 | 1990-09-25 | Toho Kagaku Kogyo Co., Ltd. | Method for plugging lost circulation areas and lost circulation material to be used therefor |
| CN103642476A (en) * | 2013-12-17 | 2014-03-19 | 长江大学 | Shale gas exploitation oil-based drilling fluid well-cementing prepad fluid |
| CN105134110A (en) * | 2015-08-20 | 2015-12-09 | 中国海洋石油总公司 | Method for cleaning high-density drilling fluid mud cakes |
| CN112521924A (en) * | 2020-12-02 | 2021-03-19 | 中联煤层气有限责任公司 | Pad fluid and preparation method thereof |
-
2021
- 2021-08-24 CN CN202110976473.5A patent/CN115873571B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4958685A (en) * | 1988-05-27 | 1990-09-25 | Toho Kagaku Kogyo Co., Ltd. | Method for plugging lost circulation areas and lost circulation material to be used therefor |
| CN103642476A (en) * | 2013-12-17 | 2014-03-19 | 长江大学 | Shale gas exploitation oil-based drilling fluid well-cementing prepad fluid |
| CN105134110A (en) * | 2015-08-20 | 2015-12-09 | 中国海洋石油总公司 | Method for cleaning high-density drilling fluid mud cakes |
| CN112521924A (en) * | 2020-12-02 | 2021-03-19 | 中联煤层气有限责任公司 | Pad fluid and preparation method thereof |
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