CN112794936A - Polymer filtrate reducer and drilling fluid - Google Patents
Polymer filtrate reducer and drilling fluid Download PDFInfo
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- CN112794936A CN112794936A CN202110082052.8A CN202110082052A CN112794936A CN 112794936 A CN112794936 A CN 112794936A CN 202110082052 A CN202110082052 A CN 202110082052A CN 112794936 A CN112794936 A CN 112794936A
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- 238000005553 drilling Methods 0.000 title claims abstract description 32
- 239000012530 fluid Substances 0.000 title claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 27
- 229920000642 polymer Polymers 0.000 title claims abstract description 25
- 239000000706 filtrate Substances 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 15
- 239000006185 dispersion Substances 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 10
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000000084 colloidal system Substances 0.000 claims abstract description 8
- 238000001035 drying Methods 0.000 claims abstract description 6
- 239000012966 redox initiator Substances 0.000 claims abstract description 6
- XFTALRAZSCGSKN-UHFFFAOYSA-M sodium;4-ethenylbenzenesulfonate Chemical compound [Na+].[O-]S(=O)(=O)C1=CC=C(C=C)C=C1 XFTALRAZSCGSKN-UHFFFAOYSA-M 0.000 claims abstract description 6
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 5
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000008367 deionised water Substances 0.000 claims abstract description 4
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 4
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000001132 ultrasonic dispersion Methods 0.000 claims abstract description 4
- 238000005406 washing Methods 0.000 claims abstract description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000000654 additive Substances 0.000 claims description 11
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 10
- 239000010426 asphalt Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 239000011248 coating agent Substances 0.000 claims description 7
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000440 bentonite Substances 0.000 claims description 6
- 229910000278 bentonite Inorganic materials 0.000 claims description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 6
- 239000003085 diluting agent Substances 0.000 claims description 6
- 239000003112 inhibitor Substances 0.000 claims description 6
- 239000000314 lubricant Substances 0.000 claims description 6
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 5
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 claims description 4
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 claims description 4
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 3
- 239000010428 baryte Substances 0.000 claims description 3
- 229910052601 baryte Inorganic materials 0.000 claims description 3
- 239000003077 lignite Substances 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000003784 tall oil Substances 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 2
- 239000002131 composite material Substances 0.000 claims description 2
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical compound [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 2
- 239000004519 grease Substances 0.000 claims description 2
- 230000002401 inhibitory effect Effects 0.000 claims description 2
- 229920000831 ionic polymer Polymers 0.000 claims description 2
- SZVJSHCCFOBDDC-UHFFFAOYSA-N iron(II,III) oxide Inorganic materials O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 2
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims description 2
- 239000011664 nicotinic acid Substances 0.000 claims description 2
- 239000010452 phosphate Substances 0.000 claims description 2
- -1 phosphate ester Chemical class 0.000 claims description 2
- 239000001103 potassium chloride Substances 0.000 claims description 2
- 235000011164 potassium chloride Nutrition 0.000 claims description 2
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 2
- QLNJFJADRCOGBJ-UHFFFAOYSA-N propionamide Chemical compound CCC(N)=O QLNJFJADRCOGBJ-UHFFFAOYSA-N 0.000 claims description 2
- 229940080818 propionamide Drugs 0.000 claims description 2
- 235000010265 sodium sulphite Nutrition 0.000 claims description 2
- 239000012065 filter cake Substances 0.000 description 11
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000002002 slurry Substances 0.000 description 3
- CPELXLSAUQHCOX-UHFFFAOYSA-N Hydrogen bromide Chemical compound Br CPELXLSAUQHCOX-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- XRPCDXSRXPQUKT-UHFFFAOYSA-N 4-(2-bromoethyl)benzenesulfonic acid Chemical compound OS(=O)(=O)C1=CC=C(CCBr)C=C1 XRPCDXSRXPQUKT-UHFFFAOYSA-N 0.000 description 1
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 229910000042 hydrogen bromide Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- NRTBZBYBLPEOCE-UHFFFAOYSA-L potassium;sodium;sulfite Chemical compound [Na+].[K+].[O-]S([O-])=O NRTBZBYBLPEOCE-UHFFFAOYSA-L 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000967 suction filtration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/44—Polymerisation in the presence of compounding ingredients, e.g. plasticisers, dyestuffs, fillers
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
- C09K8/24—Polymers
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a polymer filtrate reducer and drilling fluid, wherein the polymer filtrate reducer is prepared by the following steps: adding acrylamide, sodium p-styrene sulfonate and methacrylic acid into water, uniformly stirring, adding graphene oxide, and performing closed ultrasonic dispersion to obtain a graphene oxide dispersion liquid; adjusting the pH value of the graphene oxide dispersion liquid to 9-12, adding a redox initiator, heating for reaction, after the reaction is finished, reducing the temperature to 30-50 ℃, and curing at constant temperature for 2-5h to obtain polymer colloid; and washing the polymer colloid with ethanol and deionized water for several times, drying to constant weight, and crushing and granulating to obtain the filtrate reducer. The filtrate reducer can be directly added into the drilling fluid for use. The polymer filtrate reducer prepared by the invention not only can greatly reduce the filtrate loss of the drilling fluid, but also has better high-temperature resistance.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to a high-molecular fluid loss additive and drilling fluid comprising the same.
Background
During the drilling process, due to the action of the pressure difference, the water in the drilling fluid is inevitably lost to the stratum through the well wall, so that the drilling fluid loses water. As water enters the formation, clay particles in the drilling fluid adhere to the wellbore wall to form a "filter cake," forming a filter cake wellbore. As the well wall of the filter cake is much denser than the original well wall, the filter cake prevents the drilling fluid from further losing water on one hand and plays a role in protecting the well wall on the other hand. However, in the process of forming a filter cake well wall, the filtered water content is too much, the filter cake is too thick, and fine clay particles enter the stratum along with the water content, so that normal drilling is affected and the stratum is damaged. The filtration loss of the drilling fluid and the formation of a filter cake are inevitable during the drilling process, and the filter cake can be formed through the filtration loss to protect the well wall. However, the shale is easy to expand and collapse due to the excessive drilling fluid filtration loss, so that the well wall is unstable. In addition, the filter cake thickens while the fluid loss increases, which reduces the well diameter and causes sticking. However, the filter cake of the existing drilling fluid is formed underground, and the filter loss of the drilling fluid is relatively large.
Disclosure of Invention
In order to solve the problems, the invention provides a high-molecular filtrate reducer which can ensure that the drilling fluid has smaller filtrate loss while ensuring that the drilling fluid forms a filter cake.
The technical scheme of the invention is as follows: a polymer filtrate reducer is prepared by the following steps:
s1, adding 4-5 parts by weight of acrylamide, 5-6 parts by weight of sodium p-styrene sulfonate and 5-8 parts by weight of methacrylic acid into 50 parts by weight of water, uniformly stirring, adding 0.5-1 part by weight of graphene oxide, and carrying out closed ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
s2, taking the graphene oxide dispersion liquid obtained in the step S1, adjusting the pH value of the graphene oxide dispersion liquid to 9-12, adding a redox initiator, heating to 50-60 ℃, reacting for 3-8 hours, after the reaction is finished, reducing the temperature to 30-50 ℃, and curing at constant temperature for 2-5 hours to obtain a polymer colloid;
s3, washing the polymer colloid obtained in the step S2 with ethanol and deionized water for a plurality of times, drying to constant weight, and crushing and granulating to obtain the fluid loss additive.
Further, the redox initiator is a combination of sodium sulfite and any one of ammonium persulfate, ammonium persulfate or potassium persulfate.
Further, in the step S3, the drying temperature is 60 to 70 ℃.
The invention also aims to provide a drilling fluid with low filtration loss and good salt resistance, which comprises the following components in parts by weight: 100 parts of water, 2-12 parts of bentonite, 0.1-1 part of sodium carbonate, 0.001-0.3 part of sodium hydroxide, 0.2-4 parts of coating agent, 3-10 parts of the filtrate reducer, 1-8 parts of inhibitor, 0.5-9 parts of plugging anti-collapse agent, 1-10 parts of viscosity reducer, 2-6 parts of wall-fixing agent, 1-5 parts of diluent, 2-9 parts of lubricant and 10-50 parts of weighting agent.
Further, the drilling fluid comprises the following components in parts by weight: 100 parts of water, 4-10 parts of bentonite, 0.2-0.9 part of sodium carbonate, 0.002-0.2 part of sodium hydroxide, 1-3 parts of coating agent, 4-9 parts of filtrate reducer, 2-6 parts of inhibitor, 2-7 parts of plugging anti-collapse agent, 2-8 parts of viscosity reducer, 3-5 parts of wall fixing agent, 2-4 parts of diluent, 3-8 parts of lubricant and 12-48 parts of weighting agent.
Further, the coating agent is FA-367; the plugging anti-collapse agent is at least one of a self-bionic plugging anti-collapse agent, water-dispersible emulsified asphalt powder SFT or a non-fluorescent white asphalt NFA-25 inhibiting plugging anti-collapse agent; the inhibitor is at least one of sulfonated asphalt FT-1, propionamide or potassium chloride; the viscosity reducer is at least one of sulfonated lignite, an oligomer viscosity reducer XB-40 or a composite ionic polymer viscosity reducer PSC 90-6; the wall-fixing agent is a modified resin polymer HLGB-2; the diluent is at least one of a silyl ether polymer, SMT-T or XG-1; the lubricant is at least one of sulfonated tall oil pitch, phosphate ester or sulfurized grease; the weighting agent is at least one of barite, magnetite powder or ilmenite powder.
The invention has the beneficial effects that: the polymer filtrate reducer prepared by the invention not only can greatly reduce the filtrate loss of the drilling fluid, but also has better high-temperature resistance; the drilling fluid provided by the invention can form high-quality mud cakes on a well wall, improves the stability of the mud cakes, has low filtration loss and also has good salt resistance.
Detailed Description
In order to make the technical scheme and technical advantages of the invention clearer, the following will clearly and completely describe the technical scheme in the implementation process of the invention in combination with the practical application process of the invention in the development of certain compact oil reservoir in Xinjiang.
The various chemical feedstocks in this example, unless otherwise specified, were chemically pure, with acrylamide purchased from a Zibo Oriental plant; sodium p-styrene sulfonate is commercially available from Condidis chemical Co., Ltd, Hubei; the sodium p-styrene sulfonate is prepared by removing hydrogen bromide from p-bromoethylbenzene sulfonic acid under the action of sodium hydroxide, and is white to yellowish powder; methacrylic acid is available from Junxin chemical Co., Ltd, Shandong; sodium bisulfite was purchased from Shanghai reagent factory in China medicine.
Example 1
Preparing a polymer filtrate reducer:
s1, adding 40g of acrylamide, 50g of sodium p-styrene sulfonate and 60g of methacrylic acid into 500mL of water, adding 6g of graphene oxide, and performing ultrasonic dispersion on the graphene oxide in a closed state to obtain a graphene oxide dispersion liquid.
S2, adjusting the pH of the graphene oxide dispersion liquid obtained in the S1 to 10 by using a sodium hydroxide solution in a nitrogen atmosphere, adding a sodium sulfite-potassium persulfate redox initiator in a ratio of 1:1.4, heating to 55 ℃, reacting for 6 hours, observing that the reaction liquid becomes viscous at the moment, stopping the reaction, and curing at constant temperature of 45 ℃ for 4 hours to obtain the polymer colloid.
S3, washing the polymer colloid in the step S2 with ethanol and deionized water for 3 times in sequence, performing suction filtration, drying the solid phase at 60 ℃ to constant weight, and then crushing and granulating to obtain the polymer fluid loss agent A1.
Preparing the drilling fluid:
1. adding 700g of bentonite and 50g of sodium carbonate into 10L of water, stirring for 6 hours, and standing for 24 hours to form base slurry;
2. under the condition of high-speed stirring, 100g of coating agent FA-367, 400g of water-dispersible emulsified asphalt powder SFT, 300g of sulfonated asphalt FT-1, 300g of sulfonated lignite, 400g of modified resin polymer HLGB-2, 300g of SMT-T, 400g of sulfonated tall oil asphalt, 2000g of barite and 60g of the polymer filtrate reducer prepared in the above steps are sequentially added into the base slurry, the stirring is continued for 30min, and the pH value of the polymer filtrate reducer is adjusted to 11 by using sodium hydroxide, so that the drilling fluid S1 of the embodiment is obtained.
Examples 2-4 were formed in the drilling fluid by varying the addition of each material and pH to prepare different polymeric fluid loss additives according to the procedure in example 1, while varying the addition of each material so that the addition of at least one of the materials in the polymeric fluid loss additive does not form comparative examples 1-2 within the scope of the present invention, the addition of each material being as shown in the following table:
TABLE 1 addition of substances for the preparation of polymeric fluid loss additives in examples 1-4 and comparative examples 1-2
To further illustrate the technical effects of the present invention, specific tests are used to describe the same.
Fluid loss test
The effect of the invention is illustrated by measuring the fluid loss of the drilling fluid and the fluid loss after aging for 8 hours at 200 ℃, in the test process, the bentonite content of the base slurry is 6%, the mineralization degree is 50000mg/L, and the test instrument is a high-temperature high-pressure fluid loss instrument. Specific test results are shown in table 2.
TABLE 2 fluid loss test results for inventive and comparative examples
| Numbering | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 |
| Fluid loss/mL before aging | 4.5 | 5 | 3 | 4 | 18 | 15 |
| Filtration loss/mL after aging | 5.5 | 6 | 4 | 5.5 | 23 | 21 |
As can be seen from Table 2, the fluid loss additive of the invention has good fluid loss effect and good high temperature resistance, while the fluid loss additives of comparative example 1 and comparative example 2 have poor effects due to poor mixture ratio of the components.
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 (6)
1. The polymer filtrate reducer is characterized by being prepared by the following steps:
s1, adding 4-5 parts by weight of acrylamide, 5-6 parts by weight of sodium p-styrene sulfonate and 5-8 parts by weight of methacrylic acid into 50 parts by weight of water, uniformly stirring, adding 0.5-1 part by weight of graphene oxide, and carrying out closed ultrasonic dispersion to obtain a graphene oxide dispersion liquid;
s2, taking the graphene oxide dispersion liquid obtained in the step S1, adjusting the pH value of the graphene oxide dispersion liquid to 9-12, adding a redox initiator, heating to 50-60 ℃, reacting for 3-8 hours, after the reaction is finished, reducing the temperature to 30-50 ℃, and curing at constant temperature for 2-5 hours to obtain a polymer colloid;
s3, washing the polymer colloid obtained in the step S2 with ethanol and deionized water for a plurality of times, drying to constant weight, and crushing and granulating to obtain the fluid loss additive.
2. The polymeric fluid loss additive according to claim 1, wherein the redox initiator is a combination of sodium sulfite and any one of ammonium persulfate, or potassium persulfate.
3. The polymeric fluid loss additive according to claim 1, wherein the drying temperature in step S3 is 60-70 ℃.
4. The drilling fluid is characterized by comprising the following components in parts by weight: 100 parts of water, 2-12 parts of bentonite, 0.1-1 part of sodium carbonate, 0.001-0.3 part of sodium hydroxide, 0.2-4 parts of coating agent, 3-10 parts of fluid loss additive prepared by the method of any one of claims 1-3, 1-8 parts of inhibitor, 0.5-9 parts of plugging anti-collapse agent, 1-10 parts of viscosity reducer, 2-6 parts of wall fixing agent, 1-5 parts of diluent, 2-9 parts of lubricant and 10-50 parts of weighting agent.
5. The drilling fluid according to claim 4, wherein the drilling fluid comprises the following components in parts by weight: 100 parts of water, 4-10 parts of bentonite, 0.2-0.9 part of sodium carbonate, 0.002-0.2 part of sodium hydroxide, 1-3 parts of coating agent, 4-9 parts of filtrate reducer, 2-6 parts of inhibitor, 2-7 parts of plugging anti-collapse agent, 2-8 parts of viscosity reducer, 3-5 parts of wall fixing agent, 2-4 parts of diluent, 3-8 parts of lubricant and 12-48 parts of weighting agent.
6. The drilling fluid of claim 4 or 5, wherein the coating agent is FA-367; the plugging anti-collapse agent is at least one of a self-bionic plugging anti-collapse agent, water-dispersible emulsified asphalt powder SFT or a non-fluorescent white asphalt NFA-25 inhibiting plugging anti-collapse agent; the inhibitor is at least one of sulfonated asphalt FT-1, propionamide or potassium chloride; the viscosity reducer is at least one of sulfonated lignite, an oligomer viscosity reducer XB-40 or a composite ionic polymer viscosity reducer PSC 90-6; the wall-fixing agent is a modified resin polymer HLGB-2; the diluent is at least one of a silyl ether polymer, SMT-T or XG-1; the lubricant is at least one of sulfonated tall oil pitch, phosphate ester or sulfurized grease; the weighting agent is at least one of barite, magnetite powder or ilmenite powder.
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| CN202110082052.8A CN112794936A (en) | 2021-01-21 | 2021-01-21 | Polymer filtrate reducer and drilling fluid |
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| CN202110082052.8A CN112794936A (en) | 2021-01-21 | 2021-01-21 | Polymer filtrate reducer and drilling fluid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114686183A (en) * | 2020-12-25 | 2022-07-01 | 中石化石油工程技术服务有限公司 | Lubricating plugging fluid loss additive for drilling fluid and preparation method thereof |
| CN115386349A (en) * | 2022-09-19 | 2022-11-25 | 成都汇能恒源科技有限公司 | Plugging type fluid loss additive for oil-based drilling fluid and preparation method thereof |
| CN115991977A (en) * | 2021-10-18 | 2023-04-21 | 中石化石油工程技术服务有限公司 | Raw material composition, filtrate reducer for drilling fluid, and preparation method and application thereof |
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| US5789349A (en) * | 1996-03-13 | 1998-08-04 | M-I Drilling Fluids, L.L.C. | Water-based drilling fluids with high temperature fluid loss control additive |
| CN102433108A (en) * | 2010-09-29 | 2012-05-02 | 中国石油化工股份有限公司 | Temperature-resistance salt-resistance filtrate reducer for drilling fluid and preparation method thereof |
| CN102585090A (en) * | 2011-01-10 | 2012-07-18 | 河南金马石油科技有限责任公司 | Preparation method for filtrate reducer |
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| CN115991977A (en) * | 2021-10-18 | 2023-04-21 | 中石化石油工程技术服务有限公司 | Raw material composition, filtrate reducer for drilling fluid, and preparation method and application thereof |
| CN115386349A (en) * | 2022-09-19 | 2022-11-25 | 成都汇能恒源科技有限公司 | Plugging type fluid loss additive for oil-based drilling fluid and preparation method thereof |
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