CN116410707A - High-temperature-resistant suspension stabilizer and high-stability oil testing completion fluid prepared from same - Google Patents
High-temperature-resistant suspension stabilizer and high-stability oil testing completion fluid prepared from same Download PDFInfo
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- CN116410707A CN116410707A CN202111668612.4A CN202111668612A CN116410707A CN 116410707 A CN116410707 A CN 116410707A CN 202111668612 A CN202111668612 A CN 202111668612A CN 116410707 A CN116410707 A CN 116410707A
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- 239000000725 suspension Substances 0.000 title claims abstract description 69
- 239000012530 fluid Substances 0.000 title claims abstract description 68
- 239000003381 stabilizer Substances 0.000 title claims abstract description 65
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 150000003839 salts Chemical class 0.000 claims abstract description 32
- 239000003999 initiator Substances 0.000 claims abstract description 29
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000007795 chemical reaction product Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 17
- WHNWPMSKXPGLAX-UHFFFAOYSA-N N-Vinyl-2-pyrrolidone Chemical compound C=CN1CCCC1=O WHNWPMSKXPGLAX-UHFFFAOYSA-N 0.000 claims abstract description 15
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 13
- 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 11
- 230000007935 neutral effect Effects 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims abstract description 10
- 238000002360 preparation method Methods 0.000 claims abstract description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 78
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 57
- 229910052601 baryte Inorganic materials 0.000 claims description 57
- 239000010428 baryte Substances 0.000 claims description 57
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 51
- 239000003795 chemical substances by application Substances 0.000 claims description 43
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 39
- 239000000203 mixture Substances 0.000 claims description 35
- 239000000243 solution Substances 0.000 claims description 35
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 32
- 239000003638 chemical reducing agent Substances 0.000 claims description 26
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 claims description 22
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 claims description 22
- 229960000892 attapulgite Drugs 0.000 claims description 20
- 229910052625 palygorskite Inorganic materials 0.000 claims description 20
- 239000002689 soil Substances 0.000 claims description 20
- 229920000191 poly(N-vinyl pyrrolidone) Polymers 0.000 claims description 19
- 239000000706 filtrate Substances 0.000 claims description 18
- 239000011780 sodium chloride Substances 0.000 claims description 18
- 239000004113 Sepiolite Substances 0.000 claims description 17
- 229910052624 sepiolite Inorganic materials 0.000 claims description 17
- 235000019355 sepiolite Nutrition 0.000 claims description 17
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 16
- 238000007334 copolymerization reaction Methods 0.000 claims description 14
- -1 acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide Chemical compound 0.000 claims description 12
- 229920006029 tetra-polymer Polymers 0.000 claims description 12
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 11
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 10
- RNIHAPSVIGPAFF-UHFFFAOYSA-N Acrylamide-acrylic acid resin Chemical compound NC(=O)C=C.OC(=O)C=C RNIHAPSVIGPAFF-UHFFFAOYSA-N 0.000 claims description 8
- 229920002126 Acrylic acid copolymer Polymers 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000007800 oxidant agent Substances 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 8
- 239000000654 additive Substances 0.000 claims description 6
- 230000000996 additive effect Effects 0.000 claims description 6
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-M Formate Chemical group [O-]C=O BDAGIHXWWSANSR-UHFFFAOYSA-M 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 229920000536 2-Acrylamido-2-methylpropane sulfonic acid Polymers 0.000 claims description 2
- 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 claims description 2
- 230000009471 action Effects 0.000 claims description 2
- 239000012267 brine Substances 0.000 claims description 2
- 239000003002 pH adjusting agent Substances 0.000 claims description 2
- 238000013112 stability test Methods 0.000 claims 1
- 238000001179 sorption measurement Methods 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 24
- 238000004062 sedimentation Methods 0.000 description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 15
- 230000003068 static effect Effects 0.000 description 15
- WFIZEGIEIOHZCP-UHFFFAOYSA-M potassium formate Chemical compound [K+].[O-]C=O WFIZEGIEIOHZCP-UHFFFAOYSA-M 0.000 description 13
- 239000005457 ice water Substances 0.000 description 8
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 8
- 239000004280 Sodium formate Substances 0.000 description 7
- 229910052757 nitrogen Inorganic materials 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 7
- HLBBKKJFGFRGMU-UHFFFAOYSA-M sodium formate Chemical compound [Na+].[O-]C=O HLBBKKJFGFRGMU-UHFFFAOYSA-M 0.000 description 7
- 235000019254 sodium formate Nutrition 0.000 description 7
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 6
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 6
- 235000011130 ammonium sulphate Nutrition 0.000 description 6
- 238000004090 dissolution Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 6
- WBHQBSYUUJJSRZ-UHFFFAOYSA-M sodium bisulfate Chemical compound [Na+].OS([O-])(=O)=O WBHQBSYUUJJSRZ-UHFFFAOYSA-M 0.000 description 6
- 229910000342 sodium bisulfate Inorganic materials 0.000 description 6
- 238000005553 drilling Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 238000000354 decomposition reaction Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000007790 solid phase Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- SCVFZCLFOSHCOH-UHFFFAOYSA-M potassium acetate Chemical compound [K+].CC([O-])=O SCVFZCLFOSHCOH-UHFFFAOYSA-M 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 159000000021 acetate salts Chemical class 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 235000011056 potassium acetate Nutrition 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000012956 testing procedure 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
- C08F271/00—Macromolecular compounds obtained by polymerising monomers on to polymers of nitrogen-containing monomers as defined in group C08F26/00
- C08F271/02—Macromolecular compounds obtained by polymerising monomers on to polymers of nitrogen-containing monomers as defined in group C08F26/00 on to polymers of monomers containing heterocyclic nitrogen
-
- 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
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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)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses a high-temperature-resistant suspension stabilizer and a preparation method thereof, wherein the high-temperature-resistant suspension stabilizer comprises the following components in percentage by weight: dissolving 15-30 parts of N-vinyl pyrrolidone in 50 parts of water, and adding 0.1-0.3 part of initiator to perform prepolymerization to obtain a prepolymerized solution; 2): dissolving 20-30 parts of 2-acrylamide-2-methylpropanesulfonic acid in 150 parts of water, adjusting the pH to be neutral, adding 10-20 parts of acrylamide for dissolving, adding the solution into the prepolymerized solution obtained in the step 1), adding 0.1-0.3 part of initiator again, and copolymerizing to obtain a reaction product; 3): washing the reaction product of the step 2) by ethanol, and drying to obtain the high-temperature-resistant suspension stabilizer. The invention also discloses a high-stability oil testing completion fluid. The high-temperature-resistant suspension stabilizer has strong adsorption capacity at high temperature, good water-based stability, excellent temperature resistance and salt resistance, and good suspension stability of the high-stability oil testing completion fluid in a high-temperature and high-salt environment.
Description
Technical Field
The invention belongs to the field of drilling and completion fluids for petroleum drilling, and particularly relates to a high-temperature-resistant suspension stabilizer and a high-stability oil testing and completion fluid prepared from the same.
Background
Accelerating the deep and ultra-deep oil and gas exploration and development becomes a great demand for oil and gas take over strategy. According to statistics, the oil gas resources of deep and ultra-deep layers in China reach 671 multiplied by 108t oil equivalent, and the oil gas resources account for 34 percent of the total oil gas resources, and 39 percent of residual petroleum and 57 percent of residual natural gas resources are distributed in the deep layers. With the progress of technology, deep well-ultra-deep well drilling technology is continuously improved, oil and gas exploration and development are continuously developed to deep stratum, and the application scale is increasingly enlarged.
In this case, the deep well-ultra deep well drilling and completion fluid technology also encounters new problems and challenges, and the challenges facing the drilling and completion technology are higher and higher due to the greater and greater depth of burial and worse geological conditions; the number of deep wells, ultra-deep wells and wells with complex structures is increasing, and the use of high-temperature high-density water-based completion fluid systems is increasing. Because the formation pressure is high, the bottom temperature is high, the well structure is complex, the high-temperature high-pressure well oil testing procedure is complex, the period of the well completion pipe column is long, the process requirement is high, and the oil testing well completion fluid has good sedimentation stability and high-temperature rheological stability under the conditions of high density and high temperature. The well completion fluid used at present has the common problems of high-temperature solidification, heavy agent sedimentation, high-temperature crosslinking and decomposition of treating agents and the like, so that the lower pipe column meets the problems of blockage, blockage of a test pipe column, difficult pump opening, failure of a test tool and the like.
How to effectively improve the fluidity of the high-temperature high-density water-based completion fluid and maintain the sedimentation stability of the high-density solid phase weighting material is a technical problem to be solved for smooth progress of completion operation engineering, and the preparation of the high-temperature-resistant suspension stabilizer is an effective technical approach for solving the problem.
Based on the above, it is necessary to develop a high temperature resistant suspension stabilizer and a high stability oil testing completion fluid prepared using the same.
Disclosure of Invention
Aiming at the problems, the invention provides the high-temperature-resistant suspension stabilizer with good temperature resistance and strong suspension stability, and the oil testing completion fluid prepared by the high-temperature-resistant suspension stabilizer has good sedimentation stability and high-temperature rheological stability under the conditions of high density and high temperature, thereby meeting the application environment requirements of high temperature, high pressure and long oil testing period of deep wells, ultra-deep wells and wells with complex structures.
Based on this, the following technical scheme is adopted:
the invention provides a preparation method of a high-temperature-resistant suspension stabilizer, which comprises the following steps:
step 1): dissolving 15-30 parts of N-vinyl pyrrolidone in 50 parts of water, adding 0.1-0.3 part of initiator, and performing prepolymerization to obtain a prepolymerized poly-N-vinyl pyrrolidone solution;
step 2): dissolving 20-30 parts of 2-acrylamide-2-methylpropanesulfonic acid in 150 parts of water, adjusting the pH to be neutral, adding 10-20 parts of acrylamide to dissolve to obtain a first solution, adding the first solution into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), adding 0.1-0.3 part of initiator again, and copolymerizing to obtain a reaction product;
step 3): washing the reaction product of the step 2) by ethanol, and drying to obtain the high-temperature-resistant suspension stabilizer.
Further, the reaction temperature of the prepolymerization in the step 1) is 40-60 ℃, and the reaction time of the prepolymerization is 0.5-1 hour.
Further, the initiator is selected from a mixture of ammonium persulfate and sodium bisulfite, or a mixture of potassium persulfate and sodium bisulfite.
Further, ammonium persulfate or potassium persulfate is used as an oxidant, and sodium bisulfite is used as a reducing agent; wherein, the mass ratio of the oxidant to the reducing agent is (1.2-1.5): 1.
further, the reaction temperature of the copolymerization in the step 2) is 50-80 ℃, and the reaction time of the copolymerization is 4-8 hours.
Further, the drying in the step 3) adopts a drying mode, and the drying temperature is 80-105 ℃.
Further, in step 2), the pH is adjusted to neutral using NaOH in an ice-water bath.
Further, in the step 2), the copolymerization is carried out under the protection of nitrogen gas to obtain a reaction product.
The invention also provides the high-temperature-resistant suspension stabilizer obtained by the preparation method, which is obtained by copolymerizing the pre-polymerized poly-N-vinyl pyrrolidone, acrylamide and 2-acrylamide-2-methylpropanesulfonic acid under the action of an initiator.
Further, the initiator is selected from a mixture of ammonium persulfate and sodium bisulfite, or a mixture of potassium persulfate and sodium bisulfite.
The invention also provides a high-stability oil testing completion fluid, which comprises the following raw materials in parts by weight: 100 parts of water, 30-90 parts of organic salt, 2-7 parts of high temperature resistant suspension stabilizer as claimed in any one of claims 7-8, 3-5 parts of saline soil, 3-6 parts of plugging agent, 2-5 parts of filtrate reducer, 80-350 parts of weighting agent and 0.3-0.5 part of pH regulator.
Further, the density of the oil testing completion fluid is 1.6-2.4g/cm 3 。
Further, the organic salt is selected from formate, acetate, or a mixture of formate and acetate.
Further, the anti-salt soil is selected from sepiolite, attapulgite or a mixture of sepiolite and attapulgite, wherein the mass ratio of the sepiolite to the attapulgite is: attapulgite= (0.4-0.8): 1.
Further, the plugging agent comprises 600-mesh calcium carbonate, 1250-mesh calcium carbonate and 2000-mesh calcium carbonate, wherein the weight ratio of 600-mesh calcium carbonate, 1250-mesh calcium carbonate and 2000-mesh calcium carbonate is 1:1:1.
Further, the fluid loss additive is selected from the group consisting of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer, acrylamide-acrylic acid copolymer, or a mixture of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer and acrylamide-acrylic acid copolymer.
Further, the weighting agent comprises 200 mesh barite, 2000 mesh barite, 4000 mesh barite and 6250 mesh barite, wherein the 2000 mesh barite accounts for 5-10wt%, the 4000 mesh barite accounts for 10-25wt%, the 6250 mesh barite accounts for 10-20wt% and the rest is 200 mesh barite.
Further, the pH adjuster is selected from NaOH or KOH.
The invention has the following beneficial technical effects:
(1) The high-temperature-resistant suspension stabilizer adopts the technical scheme that the N-vinyl pyrrolidone is polymerized in advance and then copolymerized, so that the rigidity of a molecular chain of a product is greatly improved, the resistance of molecular movement is increased, the adsorption capacity at high temperature is improved, the N-vinyl pyrrolidone block structure can inhibit the decomposition of amide groups on the molecular chain, and the high-temperature-resistant suspension stabilizer has strong adsorption capacity at high temperature, good water-based stability and excellent temperature resistance and salt resistance.
(2) The high-stability oil testing completion fluid provided by the invention is used by adopting the high-temperature-resistant suspension stabilizer to be matched with fibrous clay minerals such as sepiolite, attapulgite and the like, and has good suspension stability under high-temperature and high-salt environments. The use of ultra-fine powder is aggravated, and the sedimentation trend of solid phase particles is greatly weakened.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to specific embodiments.
In a first aspect, embodiments of the present invention relate to a high temperature suspension stabilizer obtained by copolymerizing a pre-polymerized poly-N-vinylpyrrolidone, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid with an initiator.
In a second aspect, an embodiment of the present invention provides a method for preparing a high temperature resistant suspension stabilizer, including the steps of:
step 1): 15-30 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, and 0.1-0.3 part of initiator is added for prepolymerization at a certain temperature.
Alternatively, the initiator is selected from a mixture of ammonium persulfate and sodium bisulfite, or a mixture of potassium persulfate and sodium bisulfite. Ammonium persulfate or potassium persulfate is used as an oxidant, and sodium bisulphite is used as a reducing agent; wherein, the mass ratio of the oxidant to the reducing agent is (1.2-1.5): 1.
optionally, the prepolymerization reaction temperature is 40-60 ℃;
alternatively, the pre-polymerization time is 0.5 to 1 hour.
Step 2): according to parts by weight, dissolving 20-30 parts of 2-acrylamide-2-methylpropanesulfonic acid in 150 parts of water, regulating pH to be neutral by NaOH in ice water bath, adding 10-20 parts of acrylamide for dissolving to obtain a first solution, then adding the first solution into the solution obtained in the step 1), adding 0.1-0.3 part of initiator again, and copolymerizing under the protection of nitrogen at a certain temperature.
Alternatively, the initiator is selected from a mixture of ammonium persulfate and sodium bisulfite, or a mixture of potassium persulfate and sodium bisulfite. Ammonium persulfate or potassium persulfate is used as an oxidant, and sodium bisulphite is used as a reducing agent; wherein, the mass ratio of the oxidant to the reducing agent is (1.2-1.5): 1.
optionally, the copolymerization reaction temperature is 50-80 ℃;
alternatively, the copolymerization time is 4-8 hours.
Step 3): washing the reaction product of the step 2) by ethanol, and drying to obtain the high-temperature-resistant suspension stabilizer.
Alternatively, the drying temperature is 80-105 ℃.
In a third aspect, the present invention is directed to a high stability oil completion fluid containing a high temperature suspension stabilizer.
The high-stability oil testing completion fluid containing the high-temperature-resistant suspension stabilizer comprises the following components in parts by weight: 100 parts of water, 30-90 parts of organic salt, 2-7 parts of high-temperature-resistant suspension stabilizer, 3-5 parts of saline soil, 3-6 parts of plugging agent, 2-5 parts of filtrate reducer, 80-350 parts of weighting agent and 0.3-0.5 part of pH regulator, wherein the density of the oil testing completion fluid is 1.6-2.4g/cm 3 。
Alternatively, the organic salt is a nail acid salt, an acetate salt, or a mixture thereof.
Optionally, the anti-salt soil is selected from sepiolite, attapulgite or a mixture of sepiolite and attapulgite, wherein the mass ratio of the sepiolite to the attapulgite is: attapulgite= (0.4-0.8): 1.
Optionally, the plugging agent comprises 600 mesh calcium carbonate, 1250 mesh calcium carbonate and 2000 mesh calcium carbonate, wherein the weight ratio of 600 mesh calcium carbonate, 1250 mesh calcium carbonate and 2000 mesh calcium carbonate is 1:1:1.
Alternatively, the fluid loss additive is selected from the group consisting of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer, acrylamide-acrylic acid copolymer, or a mixture of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer and acrylamide-acrylic acid copolymer.
Optionally, the weighting agent comprises 200 mesh barite, 2000 mesh barite, 4000 mesh barite and 6250 mesh barite, wherein the 2000 mesh barite accounts for 5-10wt%, the 4000 mesh barite accounts for 10-25wt%, the 6250 mesh barite accounts for 10-20wt% and the rest is 200 mesh barite.
Alternatively, the pH adjustor is NaOH or KOH.
Example 1
High temperature resistant suspension stabilizer:
step 1): 15 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.1 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 1 hour at the temperature of 60 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 10 parts of acrylamide is added for dissolution to obtain a first solution, then the first solution is added into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), 0.1 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 80 ℃ for 4 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 80 ℃ to obtain the high-temperature-resistant suspension stabilizer.
High-stability oil testing completion fluid:
the oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 2 parts of the high-temperature-resistant suspension stabilizer prepared above, 3 parts of saline soil, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator.
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein the high temperature resistant suspension stabilizer is the product obtained in the step 3);
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.4:1;
wherein the plugging agent is 600-mesh calcium carbonate, 1250-mesh calcium carbonate and 2000-mesh calcium carbonate, and the weight ratio of the 600-mesh calcium carbonate to the 1250-mesh calcium carbonate to the 2000-mesh calcium carbonate is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200-mesh, 2000-mesh, 4000-mesh and 6250-mesh barite, wherein the weight ratio of the 2000-mesh barite is 10wt%, the weight ratio of the 4000-mesh barite is 25wt%, the weight ratio of the 6250-mesh barite is 20wt%, and the weight ratio of the 200-mesh barite is 45wt%;
wherein the pH regulator is NaOH;
wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Example 2
High temperature resistant suspension stabilizer:
step 1): 30 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.3 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 0.5 hour at the temperature of 40 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 30 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 20 parts of acrylamide is added for dissolution to obtain a first solution, then the first solution is added into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), 0.3 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 50 ℃ for 8 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 105 ℃ to obtain the high-temperature-resistant suspension stabilizer.
High-stability oil testing completion fluid:
the oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 2 parts of the high-temperature-resistant suspension stabilizer prepared above, 3 parts of saline soil, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator.
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein the high temperature resistant suspension stabilizer is the product obtained in the step 3);
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.4:1;
wherein the plugging agent is 600-mesh, 1250-mesh and 2000-mesh calcium carbonate, and the weight ratio of the 600-mesh calcium carbonate to the 1250-mesh calcium carbonate to the 2000-mesh calcium carbonate is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200 mesh, 2000 mesh, 4000 mesh and 6250 mesh barite, wherein the weight ratio of the 2000 mesh barite is 10wt%, the weight ratio of the 4000 mesh barite is 25wt%, the weight ratio of the 6250 mesh barite is 20wt%, and the weight ratio of the 200 mesh barite is 45wt%;
wherein the pH regulator is NaOH;
wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Example 3
High temperature resistant suspension stabilizer:
step 1): 15 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.1 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 1 hour at the temperature of 60 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 10 parts of acrylamide is added for dissolution to obtain a first solution, then the first solution is added into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), 0.1 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 80 ℃ for 4 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 80 ℃ to obtain the high-temperature-resistant suspension stabilizer.
High-stability oil testing completion fluid:
the oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 2 parts of the high-temperature-resistant suspension stabilizer prepared above, 5 parts of saline soil, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator.
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein the high temperature resistant suspension stabilizer is the product obtained in the step 3);
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.4:1;
wherein the plugging agent is 600-mesh, 1250-mesh and 2000-mesh calcium carbonate, and the weight ratio of the 600-mesh calcium carbonate to the 1250-mesh calcium carbonate to the 2000-mesh calcium carbonate is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200 mesh, 2000 mesh, 4000 mesh and 6250 mesh barite, wherein the weight ratio of the 2000 mesh barite is 5wt%, the weight ratio of the 4000 mesh barite is 10wt%, the weight ratio of the 6250 mesh barite is 20wt%, and the weight ratio of the 200 mesh barite is 65wt%;
wherein the pH regulator is NaOH;
wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Example 4
High temperature resistant suspension stabilizer:
step 1): 15 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.1 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 1 hour at the temperature of 60 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 10 parts of acrylamide is added for dissolution, then the solution is added into the solution of the pre-polymerized poly-N-vinyl pyrrolidone obtained in the step 1), 0.1 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 80 ℃ for 4 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 80 ℃ to obtain the high-temperature-resistant suspension stabilizer.
High-stability oil testing completion fluid:
the oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 30 parts of organic salt, 7 parts of the high-temperature-resistant suspension stabilizer prepared above, 3 parts of saline soil, 6 parts of plugging agent, 5 parts of filtrate reducer, 80 parts of weighting agent and 0.5 part of pH regulator, wherein the density of the oil testing completion fluid is 1.6g/cm 3 。
Wherein the organic salt is a mixture of sodium formate and potassium acetate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein the high temperature resistant suspension stabilizer is the product obtained in the step 3);
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.8:1;
wherein the plugging agent is 600-mesh, 1250-mesh and 2000-mesh calcium carbonate, and the weight ratio of the 600-mesh calcium carbonate to the 1250-mesh calcium carbonate to the 2000-mesh calcium carbonate is 1:1:1;
wherein the filtrate reducer is a mixture of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide copolymer and acrylamide-acrylic acid copolymer, and the mass ratio of the filtrate reducer to the acrylamide-acrylic acid copolymer is 1:1;
wherein the weighting agent is 200 mesh, 2000 mesh, 4000 mesh and 6250 mesh barite, wherein the weight ratio of the 2000 mesh barite is 10wt%, the weight ratio of the 4000 mesh barite is 25wt%, the weight ratio of the 6250 mesh barite is 10wt%, and the weight ratio of the 200 mesh barite is 55wt%;
wherein the pH regulator is KOH.
Comparative example 1
The oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 3 parts of anti-saline soil, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator, wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.4:1;
wherein the plugging agent is calcium carbonate of 600 meshes, 1250 meshes and 2000 meshes, and the weight ratio of the three is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200 mesh, 2000 mesh, 4000 mesh and 6250 mesh barite, wherein the weight ratio of the 2000 mesh barite is 10%, the weight ratio of the 4000 mesh barite is 25%, the weight ratio of the 6250 mesh barite is 20% and the weight ratio of the 200 mesh barite is 45%;
wherein the pH regulator is NaOH.
Comparative example 2
High temperature resistant suspension stabilizer:
step 1): 15 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.1 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 1 hour at the temperature of 60 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 10 parts of acrylamide is added for dissolution to obtain a first solution, then the first solution is added into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), 0.1 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 80 ℃ for 4 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 80 ℃ to obtain the high-temperature-resistant suspension stabilizer.
The oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 2 parts of high-temperature-resistant suspension stabilizer, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator, wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein the plugging agent is calcium carbonate of 600 meshes, 1250 meshes and 2000 meshes, and the weight ratio of the three is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200 mesh, 2000 mesh, 4000 mesh and 6250 mesh barite, wherein the weight ratio of the 2000 mesh barite is 10%, the weight ratio of the 4000 mesh barite is 25%, the weight ratio of the 6250 mesh barite is 20% and the weight ratio of the 200 mesh barite is 45%;
wherein the pH regulator is NaOH.
Comparative example 3
High temperature resistant suspension stabilizer:
step 1): 15 parts of N-vinyl pyrrolidone is dissolved in 50 parts of water, 0.1 part of ammonium persulfate and sodium bisulphite initiator are added, and prepolymerization is carried out for 1 hour at the temperature of 60 ℃ to obtain a prepolymerized poly N-vinyl pyrrolidone solution;
step 2): according to parts by weight, 20 parts of 2-acrylamide-2-methylpropanesulfonic acid is dissolved in 150 parts of water, the pH value is regulated to be neutral by NaOH in an ice water bath, 10 parts of acrylamide is added for dissolution to obtain a first solution, then the first solution is added into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), 0.1 part of ammonium sulfate and sodium bisulfate initiator are added again, and copolymerization is carried out under the protection of nitrogen at 80 ℃ for 4 hours, so that a reaction product is obtained.
Step 3): washing the reaction product with ethanol, and drying at 80 ℃ to obtain the high-temperature-resistant suspension stabilizer.
The oil testing completion fluid comprises the following components in parts by weight: 100 parts of water, 90 parts of organic salt, 2 parts of high-temperature-resistant suspension stabilizer, 3 parts of saline soil, 3 parts of plugging agent, 2 parts of filtrate reducer, 350 parts of weighting agent and 0.3 part of pH regulator, wherein the density of the oil testing completion fluid is 2.4g/cm 3 。
Wherein the organic salt is a mixture of sodium formate and potassium formate, and the mass ratio of the organic salt to the potassium formate is 3:2;
wherein, the anti-saline soil is a mixture of sepiolite and attapulgite, and the mass ratio is 0.4:1;
wherein the plugging agent is calcium carbonate of 600 meshes, 1250 meshes and 2000 meshes, and the weight ratio of the three is 1:1:1;
wherein the filtrate reducer is acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer;
wherein the weighting agent is 200 mesh barite;
wherein the pH regulator is NaOH.
And (3) evaluating beneficial effects:
the evaluation methods used were to test the sedimentation stability of the completion fluids prepared in examples 1 to 4 and comparative examples 1 to 3 and the static shear force of the completion fluids.
Sedimentation stability: the completion fluids prepared in examples 1 to 4 and comparative examples 1 to 3 were allowed to stand and age at 200℃for 15 days, and the sedimentation stability of the completion fluids was evaluated by a glass rod plug observation method.
Static shear force of completion fluid: after completion of the test for sedimentation stability, the completion fluid sample was stirred with a high-speed stirrer at 11000r/min for 20min, and the static shear force of the completion fluid at 50 ℃ was measured according to the GB/T16783.1-2014 standard, and experimental data and phenomenon descriptions are shown in Table 1 below.
Wherein the static force reflects the strength of the internal gel network when the completion fluid is at rest. The magnitude of the static shear force is determined by the number of structural chains in the fluid per unit volume and the strength of the individual structural chains. The internal structure sequence of the fluid gradually tends to be stable, the structure development tends to be perfect, and the static shearing force also increases. Thus, the gel strength is measured for increasing or decreasing, the static shear force must be measured twice, and the static shear force is measured for 10 seconds and 10 minutes of rest, respectively, as defined by the API standard, and is referred to as the initial shear force and the final shear force. The static shear force should be kept at a certain value to prevent accidents caused by the rapid sinking of coarse particles in the completion fluid.
TABLE 1
The respective raw materials of comparative examples 1 to 3 and those of examples 1 to 4 have, in addition to the presence of a part of the component content, the following:
comparative example wherein comparative example 1 is the completion fluid of example 1 without the addition of a high temperature resistant suspension stabilizer, comparative example 2 is the completion fluid of example 1 without the addition of a brine, and comparative example 3 is the completion fluid of example 1 without the use of an ultra-micro weighting material.
The completion fluid of comparative example 1 did not include a high temperature suspension stabilizer and the fluid loss additive was different from examples 1-4; the completion fluid of comparative example 2 did not include saline soil and the fluid loss additive was different from examples 1-4; the completion fluid of comparative example 3 did not use ultra-fine powder weighting (and 2000 mesh, 4000 mesh, 6250 mesh barite) and the fluid loss additive was different from examples 1-4.
As can be seen from table 1:
the static shear force of comparative example 1 was lower than that of examples 1-4 and the sedimentation stability was poor, specifically, the can surface had about 3.5cm high liquid precipitation, the glass rod dropped 9cm and the bottom had harder weighting agent sedimentation.
The static shear force of comparative example 2 is slightly higher than that of comparative example 1, but lower than that of examples 1-4; and the sedimentation stability was superior to that of comparative example 1, but the bottom was slightly sedimented.
Comparative example 3 has a higher static shear force than examples 1-4 and comparative examples 1-2, but has poor sedimentation stability, and has a gap from examples 1-4 in that the completion fluid is thicker and the glass rod slowly drops to the bottom.
The static shear force of the completion fluids of examples 1-4 was maintained at a suitable value and combined with excellent sedimentation stability performance, i.e., no liquid precipitation was seen on the tank surface, and the glass rod was allowed to fall freely to the bottom; the bottom was soft and no sedimentation was seen.
The high-temperature-resistant suspension stabilizer disclosed by the invention has the advantages that the technical scheme that the N-vinyl pyrrolidone is adopted for copolymerization after prepolymerization is adopted, the rigidity of a product molecular chain is greatly improved, the resistance to molecular movement is increased, the adsorption capacity at high temperature is improved, the amide decomposition on the molecular chain can be inhibited by the N-vinyl pyrrolidone block structure, the adsorption capacity of the high-temperature-resistant suspension stabilizer at high temperature is strong, the water-based stability is good, and the high-temperature-resistant and salt-resistant performances are realized. The oil testing completion fluid of the embodiments 1-4 is used by adopting the high-temperature-resistant suspension stabilizer and being matched with fibrous clay mineral sepiolite, attapulgite and the like, and has good suspension stability under the high-temperature and high-salt environment. Examples 1-4 use ultrafine powders of, for example, 2000 mesh, 4000 mesh, 6250 mesh barite with a greatly reduced tendency to sedimentation of the solid phase particles.
Both comparative examples 1 and 2 were blended with either the saline soil resistance or the high temperature suspension stabilizer, and there was no blending relationship of the saline soil resistance and the high temperature suspension stabilizer, and thus, the static shear force and the sedimentation stability of the completion fluids of comparative examples 1 and 2 were not excellent.
Comparative example 1 does not include a high temperature resistant suspension stabilizer, has strong adsorption capacity at high temperature, good water-based stability and excellent temperature resistance, salt resistance and the like due to the absence of an N-vinyl pyrrolidone block structure. Thus, the static shear force and the sedimentation stability of comparative example 1 were the worst in all the samples.
The completion fluid of comparative example 3 was not weighted with ultra-fine powder, was thicker and the glass rod was slowly dropped to the bottom.
The foregoing is an exemplary embodiment of the present disclosure, but it should be noted that various changes and modifications could be made herein without departing from the scope of the disclosure as defined by the appended claims. Although elements of the embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omission, modification, equivalent replacement, improvement, etc. of the embodiments should be included in the protection scope of the embodiments of the present invention.
Claims (16)
1. The preparation method of the high-temperature-resistant suspension stabilizer is characterized by comprising the following steps:
step 1): dissolving 15-30 parts of N-vinyl pyrrolidone in 50 parts of water, adding 0.1-0.3 part of initiator, and performing prepolymerization to obtain a prepolymerized poly-N-vinyl pyrrolidone solution;
step 2): dissolving 20-30 parts of 2-acrylamide-2-methylpropanesulfonic acid in 150 parts of water, adjusting the pH to be neutral, adding 10-20 parts of acrylamide to dissolve to obtain a first solution, adding the first solution into the pre-polymerized poly-N-vinyl pyrrolidone solution obtained in the step 1), adding 0.1-0.3 part of initiator again, and copolymerizing to obtain a reaction product;
step 3): washing the reaction product of the step 2) by ethanol, and drying to obtain the high-temperature-resistant suspension stabilizer.
2. The method for preparing a high temperature suspension stabilizer according to claim 1, wherein the reaction temperature of the preliminary polymerization in step 1) is 40 to 60 ℃ and the reaction time of the preliminary polymerization is 0.5 to 1 hour.
3. The method of preparing a high temperature suspension stabilizer according to claim 1, wherein the initiator is selected from the group consisting of a mixture of ammonium persulfate and sodium bisulfite, or a mixture of potassium persulfate and sodium bisulfite.
4. The method for preparing the high-temperature-resistant suspension stabilizer according to claim 1, wherein ammonium persulfate or potassium persulfate is used as an oxidant and sodium bisulfite is used as a reducing agent; wherein, the mass ratio of the oxidant to the reducing agent is (1.2-1.5): 1.
5. the method for preparing a high temperature suspension stabilizer according to claim 1, wherein the copolymerization reaction temperature of step 2) is 50-80 ℃ and the copolymerization reaction time is 4-8 hours.
6. The method for preparing the high temperature resistant suspension stabilizer according to claim 1, wherein the drying in the step 3) adopts a drying mode, and the drying temperature is 80-105 ℃.
7. A high temperature suspension stabilizer obtained by the preparation method according to any one of claims 1 to 6, wherein the high temperature suspension stabilizer is obtained by copolymerizing a prepolymerized poly-N-vinylpyrrolidone, acrylamide and 2-acrylamido-2-methylpropanesulfonic acid under the action of an initiator.
8. The high temperature resistant suspension stabilizer according to claim 8, wherein the initiator is selected from the group consisting of ammonium persulfate and sodium bisulfite mixtures, or potassium persulfate and sodium bisulfite mixtures.
9. The high-stability oil testing completion fluid is characterized by comprising the following raw materials in parts by weight: 100 parts of water, 30-90 parts of organic salt, 2-7 parts of high temperature resistant suspension stabilizer as claimed in any one of claims 7-8, 3-5 parts of saline soil, 3-6 parts of plugging agent, 2-5 parts of filtrate reducer, 80-350 parts of weighting agent and 0.3-0.5 part of pH regulator.
10. The high stability test oil completion fluid of claim 9, wherein the test oil completion fluid has a density of 1.6-2.4g/cm 3 。
11. The high stability oil completion fluid of claim 9, wherein the organic salt is selected from formate, acetate, or a mixture of formate and acetate.
12. The high stability oil completion fluid of claim 9, wherein the anti-brine is selected from the group consisting of sepiolite, attapulgite, and mixtures of sepiolite and attapulgite, wherein the mass ratio of sepiolite to attapulgite is: attapulgite= (0.4-0.8): 1.
13. The high stability oil testing completion fluid of claim 9, wherein the plugging agent comprises 600 mesh calcium carbonate, 1250 mesh calcium carbonate, and 2000 mesh calcium carbonate, wherein the weight ratio of 600 mesh calcium carbonate, 1250 mesh calcium carbonate, and 2000 mesh calcium carbonate is 1:1:1.
14. The high stability oil completion fluid of claim 9, wherein the fluid loss additive is selected from the group consisting of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer, acrylamide-acrylic acid copolymer, or a mixture of acrylamide-2-methylpropanesulfonic acid-acrylic acid-N, N-dimethylacrylamide tetrapolymer and acrylamide-acrylic acid copolymer.
15. The high stability oil testing completion fluid of claim 9 wherein the weighting agent comprises 200 mesh barite, 2000 mesh barite, 4000 mesh barite, and 6250 mesh barite, wherein 2000 mesh barite comprises 5-10wt%, 4000 mesh barite comprises 10-25wt%, 6250 mesh barite comprises 10-20wt% and the balance 200 mesh barite.
16. The high stability oil completion fluid of claim 9, wherein the pH modifier is selected from NaOH or KOH.
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