CN114774091B - High-temperature-resistant polymer drilling fluid - Google Patents
High-temperature-resistant polymer drilling fluid Download PDFInfo
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- CN114774091B CN114774091B CN202210333015.4A CN202210333015A CN114774091B CN 114774091 B CN114774091 B CN 114774091B CN 202210333015 A CN202210333015 A CN 202210333015A CN 114774091 B CN114774091 B CN 114774091B
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- 238000005553 drilling Methods 0.000 title claims abstract description 69
- 239000012530 fluid Substances 0.000 title claims abstract description 61
- 229920000642 polymer Polymers 0.000 title claims abstract description 53
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 52
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 39
- 239000000706 filtrate Substances 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 22
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 21
- 238000002360 preparation method Methods 0.000 claims abstract description 16
- 238000001914 filtration Methods 0.000 claims abstract description 15
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 239000000440 bentonite Substances 0.000 claims abstract description 10
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 10
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 10
- 239000002002 slurry Substances 0.000 claims abstract 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 abstract description 3
- 239000013078 crystal Substances 0.000 claims abstract description 3
- 239000004575 stone Substances 0.000 claims abstract description 3
- 239000000243 solution Substances 0.000 claims description 26
- 238000003756 stirring Methods 0.000 claims description 26
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 20
- 150000001875 compounds Chemical class 0.000 claims description 16
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 15
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 10
- ZHNUHDYFZUAESO-UHFFFAOYSA-N Formamide Chemical compound NC=O ZHNUHDYFZUAESO-UHFFFAOYSA-N 0.000 claims description 10
- 239000003999 initiator Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 229910052757 nitrogen Inorganic materials 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000010426 asphalt Substances 0.000 claims description 6
- 238000000034 method Methods 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 4
- 239000010428 baryte Substances 0.000 claims description 4
- 229910052601 baryte Inorganic materials 0.000 claims description 4
- 239000007864 aqueous solution Substances 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 238000009775 high-speed stirring Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 2
- 229920000831 ionic polymer Polymers 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 10
- 230000001603 reducing effect Effects 0.000 abstract description 5
- 238000005461 lubrication Methods 0.000 abstract description 4
- 238000005189 flocculation Methods 0.000 abstract description 3
- 230000016615 flocculation Effects 0.000 abstract description 3
- 230000000379 polymerizing effect Effects 0.000 abstract 1
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 10
- 239000011521 glass Substances 0.000 description 8
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 7
- 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 description 7
- 239000000654 additive Substances 0.000 description 5
- 239000002585 base Substances 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 description 3
- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000011085 pressure filtration Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 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 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000000129 anionic group Chemical group 0.000 description 1
- 239000012736 aqueous medium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012065 filter cake Substances 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 230000009545 invasion Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000006210 lotion Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000011734 sodium Substances 0.000 description 1
- 229910052708 sodium Inorganic materials 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 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
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
- C09K8/035—Organic additives
-
- 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
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
- C08F220/585—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine and containing other heteroatoms, e.g. 2-acrylamido-2-methylpropane sulfonic acid [AMPS]
-
- 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
-
- 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
- C09K2208/34—Lubricant additives
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a high-temperature-resistant polymer drilling fluid which comprises the following components in parts by weight: 100 parts of water, 2-10 parts of bentonite, 0.2-1.0 part of sodium carbonate, 0.01-0.3 part of sodium hydroxide, 0.2-4 parts of coating agent FA-3670, 1-5 parts of filtrate reducer, 0.5-5 parts of viscosity reducer, 0.5-2.2 parts of plugging agent and 10-60 parts of heavy crystal stone. The filtrate reducer is prepared by polymerizing 2-acrylamide-2-methylpropanesulfonic acid, acrylamide and 4-sodium styrenesulfonate at 55-65 ℃. The preparation method of the polymer drilling fluid provided by the invention comprises the steps of base slurry preparation, polymer preparation and drilling fluid preparation. The drilling fluid has good rheological property and proper filtration loss under high-temperature and high-pressure environment, and can solve the problems of reducing the filtration loss of the drilling fluid and poor flocculation and lubrication effects of the polymer under high-temperature and high-pressure conditions.
Description
Technical Field
The invention relates to the technical field of drilling fluid, in particular to high-temperature-resistant polymer drilling fluid.
Background
The drilling fluid is an important component of drilling engineering in the oil and gas drilling process, and the performance of the drilling fluid greatly influences the drilling speed, quality and cost, so the drilling fluid has great significance for quick, safe and low-cost drilling engineering.
In the drilling process, due to the existence of the ground temperature gradient, the bottom hole temperature is gradually increased along with the increase of the drilling depth, the formation pressure is continuously increased along with the increase of the drilling depth, the well depth is normally over 6000m, the bottom hole temperature can reach over 200 ℃, the formation pressure reaches 63MPa, the performances of components such as a treating agent, a viscosity reducer and the like in the high-temperature high-pressure drilling fluid can be greatly changed, and the oil-based drilling fluid is less influenced by temperature and pressure, but has strong pollution, so the high-temperature high-pressure water-based drilling fluid is a main research direction of deep well drilling. The water-based drilling fluid mainly comprises water, a treating agent, a viscosity reducer and the like, and the performance of the water-based drilling fluid is closely related to the components and the proportion of various substances such as the treating agent, the viscosity reducer and the like. With the continuous progress of water-based drilling fluid technology, polymer treating agents represented by acrylamide and acrylic acid multipolymer are formed, and corresponding polymer drilling fluid systems are formed, so that the progress of the drilling fluid technology is promoted. From the application of the 20 th century 80, the temperature resistance of the polymer treatment agent has been not ideal, and especially in the case of high-temperature composite salts, the ability to reduce the fluid loss of the drilling fluid is poor, which causes the polymer to show its own limitations. Therefore, there is an urgent need for a polymer treatment agent capable of resisting high temperature, which can reduce the filtration loss of drilling fluid under high temperature conditions and has poor flocculation and lubrication effects.
Disclosure of Invention
The invention aims to solve the problems of poor temperature resistance, low filtrate loss of the drilling fluid and poor lubrication effect of the conventional drilling fluid under the condition of high temperature and high pressure of a polymer, and provides a high-temperature resistant polymer drilling fluid.
The invention provides high-temperature-resistant polymer drilling fluid which comprises the following components in parts by weight:
100 parts of water, 2-10 parts of bentonite, 0.2-1.0 part of sodium carbonate, 0.01-0.3 part of sodium hydroxide, 0.2-4 parts of coating agent FA-3670, 1-5 parts of filtrate reducer, 0.5-5 parts of viscosity reducer, 0.5-2.2 parts of plugging agent and 10-60 parts of heavy crystal stone;
the filtrate reducer is prepared by the following method:
(1) Adding 2-acrylamide-2-methylpropanesulfonic acid into sodium hydroxide aqueous solution, and stirring to obtain solution;
(2) Adding acrylamide and 4-sodium styrene sulfonate into the solution in the step (1) at the temperature of-8-2 ℃ and stirring, heating in a water bath to 55-65 ℃, adding an initiator, continuously introducing nitrogen and stirring for 2-4 hours to obtain a compound, adding the compound into an acetone solution, extracting and standing for 2-4 hours, and filtering to obtain a solid; addition of solids to 1 of formamide and acetic acid: and (1) purifying the mixture, standing for 2-4h, filtering to obtain a polymer, and drying in vacuum at 45-55 ℃ for 12h to obtain the polymer solid filtrate reducer.
The preparation method of the high-temperature-resistant polymer drilling fluid comprises the following steps:
(1) Sequentially adding bentonite and sodium carbonate into water, stirring for 1h, and standing for 24h to obtain base slurry;
(2) Sequentially adding a coating agent FA-367, a viscosity reducer, a plugging agent and a weighting agent into the base slurry under the condition of high-speed stirring, adding a filtrate reducer after uniformly mixing, and stirring to completely mix; and regulating the pH value of the solution to 9-11 by using sodium hydroxide to obtain the high-temperature-resistant polymer drilling fluid.
The viscosity reducer is one or more of a zwitterionic polymer viscosity reducer JN-1, an oligomer viscosity reducer XB-40 and a compound ionic polymer viscosity reducer PSC 90-6.
The plugging agent is one or more of single pressure plugging agent DF-1 and sulfonated asphalt FT-1.
Preferably, the composition comprises the following components in parts by weight: 100 parts of water, 2-6 parts of bentonite, 0.4-1.0 part of sodium carbonate, 0.05-0.2 part of sodium hydroxide, 2-4 parts of coating agent FA-3670.5-3 parts of filtrate reducer, 11-3 parts of zwitterionic polymer viscosity reducer JN, 10.7-2.0 parts of sulfonated asphalt and 15-55 parts of barite. The density of the drilling fluid is 1.45-1.65g/cm 3 。
The sulfonated asphalt contains sulfonic groups, has strong hydration effect, and can prevent shale particles from hydration and dispersion to play a role in preventing collapse when being adsorbed on shale interfaces. Meanwhile, the water-insoluble part can fill pore throats and cracks to play a role in blocking, and can cover shale interfaces to improve mud cake quality. The sulfonated asphalt also plays roles in lubricating and reducing high-temperature high-pressure filtration loss in drilling fluid.
The barite is used as a weighting agent, so that the hydrostatic column pressure of drilling fluid can be increased, the effects of balancing formation collapse stress and stabilizing a well wall are achieved, meanwhile, the fluid pressure of the formation can be balanced in a high-pressure well, and accidents such as well kick and blowout are prevented.
The bentonite is available from Yinshou county silver super mineral products limited company, and the model is 003; the main components are silicon dioxide, aluminum oxide and water, and also contain elements such as iron, magnesium, calcium, sodium, potassium and the like, so that the water-based composite material has strong hygroscopicity and expansibility, can absorb water with the volume of 8-15 times of the self volume, has the volume expansion of several times to 30 times, and can be dispersed into gelatinous and suspended states in an aqueous medium.
The sodium carbonate can be purchased from Suzhou QC chemical engineering Co., ltd, and the model is QC-1; sodium carbonate is commonly known as soda, and the alkali of the lotion belongs to salts, is strong alkali and weak acid salt, has the universality and stability of the salt, is easy to dissolve in water, and has alkaline aqueous solution.
The coating agent FA-367 is linear large polymer with cationic, anionic and nonionic groups introduced into the molecule, and has the appearance of gray yellow powder, is dissolved in water, and is a viscous liquid. The coating has relatively strong inhibition capability, so that the coating has relatively strong capacity of resisting rock dust pollution, is easy to be polluted by the rock dust and purified, can reduce the content of submicron particles in a system, and is beneficial to increasing the mechanical drilling speed and protecting a production layer. The performance of the alloy is also improved in the aspect of temperature resistance.
Compared with the prior art, the invention has the following advantages:
compared with the prior art, the self-made polymer fluid loss additive is adopted in the drilling fluid, and the fluid loss additive not only has excellent fluid loss performance, but also has excellent lubricating performance. Meanwhile, the polymer has good rheological property and proper filtration loss under high-temperature and high-pressure environment, and can solve the problems of reducing the filtration loss of drilling fluid and poor flocculation and lubrication effects of the polymer under high-temperature and high-pressure conditions.
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 explanation only and is not intended to limit the present invention.
Example 1
A preparation method of a polymer filtrate reducer, which comprises the following steps:
(1) To 100ml of a 0.5mol/L aqueous sodium hydroxide solution was added 30 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, and the mixture was stirred at 2000rpm of a low-speed stirrer for 25 minutes to obtain a solution.
(2) And (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of minus 3 ℃, uniformly stirring by using a glass rod, heating in a water bath to the temperature of 60 ℃, adding 1 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 3 hours to obtain a compound.
(3) Adding the compound obtained in the step (2) into an acetone solution, extracting and standing for 3 hours, and filtering to obtain a solid; and adding the solid to formamide and acetic acid in a volume ratio of 1:1 and standing for 3 hours, and filtering to obtain a polymer. The polymer is dried for 12 hours in vacuum at 50 ℃ to obtain the polymer solid filtrate reducer.
Example 2
A preparation method of a polymer filtrate reducer, which comprises the following steps:
(1) To 100ml of a 0.4mol/L aqueous sodium hydroxide solution was added 20 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, and the mixture was stirred at 1500rpm in a low-speed stirrer for 20 minutes to obtain a solution.
(2) And (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of minus 8 ℃ and uniformly stirring by using a glass rod, heating in a water bath to the temperature of 55 ℃, adding 0.5 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 2 hours to obtain the compound.
(3) Adding the compound obtained in the step (2) into an acetone solution, extracting and standing for 3 hours, and filtering to obtain a solid; and adding the solid to formamide and acetic acid in a volume ratio of 1:1 and standing for 2h, and filtering to obtain polymer. The polymer is dried for 12 hours in vacuum at 45 ℃ to obtain the polymer solid filtrate reducer.
Example 3
A preparation method of a polymer filtrate reducer, which comprises the following steps:
(1) To 100ml of a 0.6mol/L aqueous sodium hydroxide solution was added 40 parts by weight of 2-acrylamido-2-methylpropanesulfonic acid, and the mixture was stirred at 2000rpm of a low-speed stirrer for 30 minutes to obtain a solution.
(2) And (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at 2 ℃, uniformly stirring by using a glass rod, heating in a water bath to 65 ℃, adding 2 parts by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 4 hours to obtain a compound.
(3) Adding the compound obtained in the step (2) into an acetone solution, extracting and standing for 4 hours, and filtering to obtain a solid; and adding the solid to formamide and acetic acid in a volume ratio of 1:1 and standing for 4 hours, and filtering to obtain a polymer. The polymer is dried for 12 hours in vacuum at 55 ℃ to obtain the polymer solid filtrate reducer.
Comparative example 1
The preparation method of the filtrate reducer comprises the same steps as in example 2, and the difference is that in the step (2): and (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of minus 10 ℃, uniformly stirring by using a glass rod, heating in a water bath to the temperature of 55 ℃, adding 0.5 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 2 hours to obtain the compound.
Comparative example 2
The preparation method of the filtrate reducer comprises the same steps as in example 2, and the difference is that in the step (2): and (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of 4 ℃, uniformly stirring by using a glass rod, heating in a water bath to the temperature of 55 ℃, adding 0.5 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 2 hours to obtain a compound.
Comparative example 3
The preparation method of the filtrate reducer comprises the same steps as in example 2, and the difference is that in the step (2): and (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of minus 8 ℃ and uniformly stirring by using a glass rod, heating in a water bath to the temperature of 70 ℃, adding 0.5 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 2 hours to obtain the compound.
Comparative example 4
The preparation method of the filtrate reducer comprises the same steps as in example 2, and the difference is that in the step (2): and (2) adding 5 parts by weight of acrylamide and 3 parts by weight of sodium 4-styrenesulfonate into the solution prepared in the step (1) at the temperature of minus 8 ℃ and uniformly stirring by using a glass rod, heating in a water bath to the temperature of 50 ℃, adding 0.5 part by weight of initiator ammonium persulfate, continuously introducing nitrogen and stirring for 2 hours to obtain the compound.
The fluid loss additives prepared in examples 1-3 and comparative examples 1-4 were used to prepare drilling fluids, respectively, as follows:
(1) 6 parts by weight of bentonite (the bentonite can be purchased from Yinyu super mineral products Co., ltd., model 003) and 0.6 part by weight of sodium carbonate are sequentially added into 100 parts by weight of water and stirred for 1 hour, and the mixture is left stand for 24 hours to obtain base slurry.
(2) Under the condition of high-speed stirring, sequentially adding 1 part by weight of coating agent FA-367 (purchased from civil eastern slurry materials Co., ltd.), 2 parts by weight of zwitterionic polymer viscosity reducer JN-1 (purchased from civil eastern slurry materials Co., ltd.), 1.5 parts by weight of plugging agent sulfonated asphalt FT-1 and 20 parts by weight of barite into the pre-hydrated base slurry, stirring and mixing uniformly, then adding 4 parts by weight of filtrate reducer, and stirring to completely mix; and regulating the pH value of the drilling fluid to 10 by using sodium hydroxide to obtain the drilling fluid.
The drilling fluids prepared by using the fluid loss additives of example 1, example 2, example 3, comparative example 1, comparative example 2, comparative example 3, and comparative example 4 were designated as drilling fluid 1, drilling fluid 2, drilling fluid 3, drilling fluid 4, drilling fluid 5, drilling fluid 6, and drilling fluid 7, respectively. Drilling fluid 8 is a commercially available filtrate reducer KJ-1 (produced by civil eastern Xingjia mud materials Co., ltd.)
The performance results of various drilling fluids are shown in the following table:
from the above table test data, it can be seen that:
(1) The high temperature resistant polymer fluid loss agent in the embodiment 1-3 is optimal in the preparation process of the component materials and the preparation conditions, and the drilling fluid added with the polymer fluid loss agent has low water loss compared with the drilling fluid in a high temperature high pressure filtration experiment, thin mud cake, good fluid loss effect and better lubricating property.
(2) The temperature control of the fluid loss additives prepared in comparative examples 1-4 is different from that of the invention, and the final product has no good fluid loss effect in drilling fluid. This is because the temperature control in step 2 of preparing the filtrate reducer is not proper, and the high temperature resistant polymer filtrate reducer cannot be prepared or is prepared only in a small amount. Therefore, in the preparation process of the filtrate reducer, the temperature control of the step 2 is important, the acrylamide and the 4-sodium styrene sulfonate are added into the solution prepared in the step 1 at the temperature of-8-2 ℃ and uniformly stirred by a glass rod, the solution is heated in a water bath to be heated to 55-65 ℃, and then the initiator is added, and the nitrogen is continuously introduced and stirred for 2-4 hours to obtain the compound. In the step, two temperature stages (-8-2 ℃ and 55-65 ℃) are ensured simultaneously and precisely controlled, so that the high-temperature-resistant filtrate reducer with optimal performance can be prepared.
(3) The drilling fluid 8 is added with a commercially available filtrate reducer, so that the filtrate reducer has a certain filtrate reducing effect, but compared with the high temperature resistant polymer filtrate reducer of the invention, the filtrate reducer has a far-reaching effect.
In conclusion, the self-made filtrate reducer is added into the high-temperature-resistant polymer drilling fluid, so that the drilling fluid can form a compact filter cake, the effect of effectively reducing filtrate loss is achieved, the invasion of filtrate is reduced, and the stability of a shaft is improved.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalents and modifications can be made to the above-mentioned embodiments without departing from the scope of the invention.
Claims (6)
1. The high temperature resistant polymer drilling fluid is characterized by comprising the following components in parts by weight:
100 parts of water, 2-10 parts of bentonite, 0.2-1.0 part of sodium carbonate, 0.01-0.3 part of sodium hydroxide, 0.2-4 parts of coating agent FA-367, 1-5 parts of filtrate reducer, 0.5-5 parts of viscosity reducer, 0.5-2.2 parts of plugging agent and 10-60 parts of heavy crystal stone;
the filtrate reducer is prepared by the following method:
(1) Adding 2-acrylamide-2-methylpropanesulfonic acid into sodium hydroxide aqueous solution, and stirring to obtain solution;
(2) Adding acrylamide and 4-sodium styrene sulfonate into the solution in the step (1) at the temperature of-8-2 ℃ and stirring, heating in a water bath to 55-65 ℃, adding an initiator, continuously introducing nitrogen and stirring for 2-4 hours to obtain a compound, adding the compound into an acetone solution, extracting and standing for 2-4 hours, and filtering to obtain a solid; addition of solids to 1 of formamide and acetic acid: and (1) purifying the mixture, standing for 2-4h, filtering to obtain a polymer, and drying in vacuum at 45-55 ℃ for 12h to obtain the polymer solid filtrate reducer.
2. The high temperature resistant polymer drilling fluid of claim 1, wherein the method of preparation comprises:
(1) Sequentially adding bentonite and sodium carbonate into water, stirring for 1h, and standing for 24h to obtain base slurry;
(2) Sequentially adding a coating agent FA-367, a viscosity reducer, a plugging agent and a weighting agent into the base slurry under the condition of high-speed stirring, adding a filtrate reducer after uniformly mixing, and stirring to completely mix; and regulating the pH value of the solution to 9-11 by using sodium hydroxide to obtain the high-temperature-resistant polymer drilling fluid.
3. The high temperature resistant polymer drilling fluid of claim 1, wherein the viscosity reducer is one or more of a zwitterionic polymer viscosity reducer JN-1, an oligomer viscosity reducer XB-40, and a composite ionic polymer viscosity reducer PSC 90-6.
4. The high temperature resistant polymer drilling fluid according to claim 3, wherein the plugging agent is one or more of single pressure plugging agent DF-1 and sulfonated asphalt FT-1.
5. The high temperature resistant polymer drilling fluid of claim 4, wherein the drilling fluid has a density of 1.45 to 1.65g/cm 3 。
6. The high temperature resistant polymer drilling fluid of claim 5, comprising the following components in parts by weight: 100 parts of water, 2-6 parts of bentonite, 0.4-1.0 part of sodium carbonate, 0.05-0.2 part of sodium hydroxide, 0.5-3 parts of coating agent FA-367, 2-4 parts of filtrate reducer, 1-3 parts of viscosity reducer, 0.7-2.0 parts of plugging agent and 15-55 parts of barite.
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