CN117886996A - High-temperature-resistant filtrate reducer, preparation method and application thereof, and deep well drilling fluid - Google Patents
High-temperature-resistant filtrate reducer, preparation method and application thereof, and deep well drilling fluid Download PDFInfo
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- CN117886996A CN117886996A CN202211222025.7A CN202211222025A CN117886996A CN 117886996 A CN117886996 A CN 117886996A CN 202211222025 A CN202211222025 A CN 202211222025A CN 117886996 A CN117886996 A CN 117886996A
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- 238000005553 drilling Methods 0.000 title claims abstract description 58
- 239000000706 filtrate Substances 0.000 title claims abstract description 57
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 51
- 239000012530 fluid Substances 0.000 title claims abstract description 48
- 238000002360 preparation method Methods 0.000 title abstract description 10
- PQUXFUBNSYCQAL-UHFFFAOYSA-N 1-(2,3-difluorophenyl)ethanone Chemical compound CC(=O)C1=CC=CC(F)=C1F PQUXFUBNSYCQAL-UHFFFAOYSA-N 0.000 claims abstract description 29
- 229940047670 sodium acrylate Drugs 0.000 claims abstract description 29
- ORNUPNRNNSVZTC-UHFFFAOYSA-N 2-vinylthiophene Chemical compound C=CC1=CC=CS1 ORNUPNRNNSVZTC-UHFFFAOYSA-N 0.000 claims abstract description 18
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000003999 initiator Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical group [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 17
- 238000003756 stirring Methods 0.000 claims description 17
- 239000011259 mixed solution Substances 0.000 claims description 15
- 239000000243 solution Substances 0.000 claims description 15
- 239000007787 solid Substances 0.000 claims description 14
- 239000000654 additive Substances 0.000 claims description 13
- 230000000996 additive effect Effects 0.000 claims description 13
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 9
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000000227 grinding Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 4
- 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
- 239000000440 bentonite Substances 0.000 claims description 4
- 229910000278 bentonite Inorganic materials 0.000 claims description 4
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 4
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 4
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 4
- 239000000230 xanthan gum Substances 0.000 claims description 4
- 229920001285 xanthan gum Polymers 0.000 claims description 4
- 229940082509 xanthan gum Drugs 0.000 claims description 4
- 235000010493 xanthan gum Nutrition 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 abstract description 5
- 230000001603 reducing effect Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 abstract description 2
- 239000002245 particle Substances 0.000 description 12
- 239000004927 clay Substances 0.000 description 10
- 239000012065 filter cake Substances 0.000 description 8
- 229920001577 copolymer Polymers 0.000 description 7
- 230000032683 aging Effects 0.000 description 6
- 239000008367 deionised water Substances 0.000 description 6
- 229910021641 deionized water Inorganic materials 0.000 description 6
- 238000001914 filtration Methods 0.000 description 5
- 230000036571 hydration Effects 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- VQIDGTFLGAAJGI-UHFFFAOYSA-M sodium;prop-1-ene-1-sulfonate Chemical compound [Na+].CC=CS([O-])(=O)=O VQIDGTFLGAAJGI-UHFFFAOYSA-M 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- 238000011085 pressure filtration Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229920001897 terpolymer Polymers 0.000 description 2
- 241000218378 Magnolia Species 0.000 description 1
- 125000003368 amide group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 125000000623 heterocyclic group Chemical group 0.000 description 1
- 230000015784 hyperosmotic salinity response Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 125000000542 sulfonic acid group Chemical group 0.000 description 1
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- 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
- C08F228/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur
- C08F228/06—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a bond to sulfur or by a heterocyclic ring containing sulfur by a heterocyclic ring containing sulfur
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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
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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
- C09K8/04—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)
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- 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)
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- Polymers & Plastics (AREA)
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Abstract
The invention belongs to the technical field of drilling fluid, and particularly relates to a high-temperature-resistant filtrate reducer, a preparation method and application thereof, and deep well drilling fluid. The high temperature resistant filtrate reducer comprises raw materials of 2-vinyl thiophene, sodium acrylate sulfonate, acrylamide and an initiator. The high-temperature-resistant filtrate reducer provided by the invention has good stability, and the performance of the filtrate reducer is not affected even under the environment that the temperature reaches 220 ℃. After the deep well drilling fluid added with the high-temperature-resistant filtrate reducer is aged for 24 hours at 220 ℃, the deep well drilling fluid still has a good filtrate reducing effect, and the high-temperature high-pressure filtrate loss can be maintained below 10mL, so that the deep well drilling fluid has the capability of resisting the high temperature at 220 ℃ and is suitable for drilling construction of deep wells.
Description
Technical Field
The invention belongs to the technical field of drilling fluid, and particularly relates to a high-temperature-resistant filtrate reducer, a preparation method and application thereof, and deep well drilling fluid.
Background
For some oil gas resources are mainly buried in deep layers, and underground conditions are extremely complex, so that deep well and ultra-deep well oil gas drilling and matched development technologies become key factors for restricting oil gas resource development. The drilling fluid is used as an important component of drilling engineering, and the performance of the drilling fluid is directly related to the drilling quality, the drilling cost and the drilling period of deep wells and ultra-deep wells. With the increase of the depth of the stratum, the stratum temperature of the deep well and the ultra-deep well is also higher and higher, for example, in the North sea area where deep stratum drilling is relatively concentrated in recent years internationally, the average drilling depth is over 5000m, and the bottom hole temperature is over 200 ℃. In summary, the high temperature environment of deep wells and ultra-deep well deep formations presents a significant challenge to the ability of the drilling fluid to maintain stable performance. Although the oil-based drilling fluid has the advantages of high temperature resistance, good lubricating performance and the like, the oil-based drilling fluid has the problems of serious pollution, high cost and high safety risk, so the development of the high-temperature-resistant water-based drilling fluid is emphasized. The key of the high temperature resistant water-based drilling fluid is a high temperature resistant drilling fluid treatment agent, in particular a filtrate reducer with stable performance under high temperature conditions.
Disclosure of Invention
The invention aims to solve the problems and provide a high-temperature-resistant filtrate reducer, a preparation method and application thereof, and deep well drilling fluid.
In order to achieve the above object, a first aspect of the present invention provides a high temperature resistant fluid loss additive, comprising the following raw materials in weight:
1 part of 2-vinyl thiophene, 0.2-0.4 part of sodium acrylate, 0.1-0.2 part of acrylamide, 0.05-0.08 part of initiator and 2-40 parts of water.
The second aspect of the present invention provides a method for preparing the high temperature resistant fluid loss additive, which comprises the following steps:
s1, mixing water with sodium acrylate to obtain a sodium acrylate solution;
S2, mixing the sodium acrylate solution obtained in the step S1 with acrylamide to obtain a mixed solution;
s3, heating and stirring the mixed solution obtained in the step S2 with 2-vinyl thiophene and an initiator for reaction to obtain viscous liquid;
S4, drying and dehydrating the viscous liquid obtained in the step S3 to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer.
The third aspect of the invention provides application of the high-temperature-resistant filtrate reducer in the technical field of drilling fluid.
A fourth aspect of the present invention provides a deep well drilling fluid, the raw material components of which include by weight:
100 parts of water, 4-6 parts of bentonite, 1-2 parts of sodium hydroxide, 3-5 parts of sodium carboxymethylcellulose, 8-10 parts of xanthan gum, 20-24 parts of calcium carbonate, 60-70 parts of barite and 4-8 parts of high temperature resistant filtrate reducer;
The high-temperature-resistant filtrate reducer is the high-temperature-resistant filtrate reducer.
The technical scheme of the invention has at least the following advantages and beneficial effects:
the high-temperature-resistant filtrate reducer and the deep well drilling fluid provided by the invention have good high-temperature resistance. The high-temperature-resistant filtrate reducer provided by the invention has good stability, and the performance of the filtrate reducer is not affected even under the environment that the temperature reaches 220 ℃. After the deep well drilling fluid added with the high-temperature-resistant filtrate reducer is aged for 24 hours at 220 ℃, the deep well drilling fluid still has a good filtrate reducing effect, and the high-temperature and high-pressure (220 ℃ and 3.5 MPa) filtrate loss can be maintained below 10mL, so that the deep well drilling fluid has the capability of resisting the high temperature of 220 ℃ and is suitable for drilling construction of deep wells.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Detailed Description
Preferred embodiments of the present invention will be described in more detail below. While the preferred embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
In order to achieve the above object, a first aspect of the present invention provides a high temperature resistant fluid loss additive, comprising the following raw materials in weight:
1 part of 2-vinyl thiophene, 0.2-0.4 part of sodium acrylate, 0.1-0.2 part of acrylamide, 0.05-0.08 part of initiator and 2-40 parts of water.
Preferably, the initiator is ammonium persulfate.
The second aspect of the present invention provides a method for preparing the high temperature resistant fluid loss additive, which comprises the following steps:
s1, mixing water with sodium acrylate to obtain a sodium acrylate solution;
S2, mixing the sodium acrylate solution obtained in the step S1 with acrylamide to obtain a mixed solution;
s3, heating and stirring the mixed solution obtained in the step S2 with 2-vinyl thiophene and an initiator for reaction to obtain viscous liquid;
S4, drying and dehydrating the viscous liquid obtained in the step S3 to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer.
The high-temperature-resistant filtrate reducer provided by the invention is a terpolymer, in the terpolymer, the adopted first monomer is 2-vinyl thiophene, and the copolymer has a rigid five-membered heterocyclic structure, so that the rigidity of a molecular chain of the prepared copolymer is enhanced, namely, the temperature resistance of the copolymer can be effectively improved; the second monomer adopted is acrylamide, has amide groups, has good temperature resistance and salt tolerance, and simultaneously has large steric hindrance in the copolymerization reaction, so that the molecular weight of the copolymer can be effectively reduced; the third monomer is sodium acrylate sulfonate, the sulfonic acid group endows the sodium acrylate sulfonate with good hydration, so that the copolymer can effectively act on clay, the copolymer molecules are adsorbed on clay particles to thicken hydration films on the surfaces of the clay particles, the clay particles cannot be aggregated under the action of thicker hydration films, namely cannot grow up further, a filter cake with lower permeability and composed of small-particle clay can be formed, and after the filter cake is formed, the copolymer molecular chains are mutually bridged to form a space grid structure, so that the effect of reducing filtration loss is achieved.
In the preparation method of the high-temperature-resistant filtrate reducer, the reaction principle comprises the following steps:
As a preferred scheme, the preparation method of the high-temperature-resistant filtrate reducer comprises the following steps:
s1, adding sodium acrylate into water, mixing and stirring to obtain sodium acrylate solution;
S2, adding acrylamide into the sodium acrylate solution obtained in the step S1, stirring and standing to obtain a mixed solution;
S3, adding 2-vinyl thiophene and an initiator into the mixed solution obtained in the step S2, and heating and stirring the mixed solution for reaction to obtain viscous liquid;
S4, drying and dehydrating the viscous liquid obtained in the step S3 to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer.
According to the present invention, in step S1 of one specific embodiment, 0.4 part of sodium propenesulfonate is added to 5 parts of water to obtain a sodium propenesulfonate solution having a concentration of 8%.
In the step S2, the standing time is 3-4 h, so as to achieve the purpose of more uniform mixing.
Preferably, in step S3, the heating temperature is 60-70 ℃.
Preferably, in step S3, the reaction time is 4h-5h.
In a preferred embodiment, in step S4, the drying temperature is 110-130 ℃ and the drying time is 8-10 h.
The third aspect of the invention provides application of the high-temperature-resistant filtrate reducer in the technical field of drilling fluid.
As a preferable scheme, the high-temperature-resistant filtrate reducer is applied to the technical field of drilling fluid, wherein the application temperature range is 200-220 ℃, and the application high-temperature range is 200-220 ℃.
A fourth aspect of the present invention provides a deep well drilling fluid, the raw material components of which include by weight:
100 parts of water, 4-6 parts of bentonite, 1-2 parts of sodium hydroxide, 3-5 parts of sodium carboxymethylcellulose, 8-10 parts of xanthan gum, 20-24 parts of calcium carbonate, 60-70 parts of barite and 4-8 parts of high temperature resistant filtrate reducer; the high-temperature-resistant filtrate reducer is the high-temperature-resistant filtrate reducer.
The high temperature resistant filtrate reducer has the following action principle in deep well drilling fluid:
(1) Improving the quality of the filter cake and forming a compact filter cake. The long-chain molecules of the high-temperature-resistant filtrate reducer can increase the compactness of the filter cake, and simultaneously, can block fine holes in clay particles to improve the compactness of the filter cake.
(2) Adsorption and bridging. The high temperature resistant filtrate reducer molecules are adsorbed on clay particles to increase the hydration degree of the clay particles, and the hydration film of the particles becomes thick, so that the clay particles are prevented from flocculating to form large particles, and the filter cake permeability formed by small particles is lower. In addition, as clay particles are deposited on the well wall to form a filter cake, polymer molecular chains are easier to bridge with each other to form a space grid structure, so that the filter loss can be reduced, and the effect of protecting the well wall is achieved.
The high-temperature-resistant filtrate reducer adopted by the invention has better high-temperature resistance, so that the failure problem caused by molecular chain fracture is avoided.
The specific conditions are not noted in the examples of the present invention, and are carried out according to conventional conditions or conditions suggested by the manufacturer. The reagents or apparatus used were conventional products commercially available without the manufacturer's attention.
In the embodiment of the invention, the CAS number of the selected sodium acrylate sulfonate is 2495-39-8, and the sodium acrylate sulfonate is purchased from Chengdu chemical reagent Co., ltd; the selected acrylamide has a CAS number of 79-06-1, available from Chengdu Ai Keda chemical Co., ltd; the CAS number of the selected 2-vinyl thiophene is 1918-82-7, and the 2-vinyl thiophene is purchased from Shanghai Michelia Biochemical technology Co., ltd; the initiator ammonium persulfate selected was available from Chemicals Ai Keda, inc. under CAS number 7727-54-0.
Example 1
The embodiment provides a high-temperature-resistant filtrate reducer and a preparation method thereof.
S1, adding deionized water into a three-neck flask, adding sodium acrylate into the deionized water, and stirring to obtain a sodium acrylate solution with the concentration of 8 wt%;
S2, adding acrylamide into the sodium acrylate solution obtained in the step S1, stirring and standing for 3.5 hours to obtain a mixed solution;
S3, respectively adding 2-vinyl thiophene and ammonium persulfate into the mixed solution obtained in the step S2, heating to 65 ℃ and stirring for reaction for 4.5 hours to obtain viscous liquid;
s4, taking out the viscous liquid obtained in the step S3, and placing the viscous liquid in an oven for drying and dehydrating, wherein the temperature of the oven is 120 ℃ and the time is 9 hours to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer A1.
Wherein, according to the mass ratio, the 2-vinyl thiophene: sodium propenesulfonate: acrylamide: ammonium persulfate=1: 0.3:0.15:0.07.
Example 2
The embodiment provides a high-temperature-resistant filtrate reducer and a preparation method thereof.
S1, adding deionized water into a three-neck flask, adding sodium acrylate into the deionized water, and stirring to obtain a sodium acrylate solution with the concentration of 8 wt%;
S2, adding acrylamide into the sodium acrylate solution obtained in the step S1, stirring and standing for 3 hours to obtain a mixed solution;
S3, respectively adding 2-vinyl thiophene and ammonium persulfate into the mixed solution obtained in the step S2, heating to 60 ℃, and stirring for reaction for 4 hours to obtain viscous liquid;
s4, taking out the viscous liquid obtained in the step S3, and placing the viscous liquid in an oven for drying and dehydrating, wherein the temperature of the oven is 120 ℃ and the time is 8 hours, so as to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer A2.
Wherein, according to the mass ratio, the 2-vinyl thiophene: sodium propenesulfonate: acrylamide: ammonium persulfate=1: 0.2:0.1:0.05.
Example 3
The embodiment provides a high-temperature-resistant filtrate reducer and a preparation method thereof.
S1, adding deionized water into a three-neck flask, adding sodium acrylate into the deionized water, and stirring to obtain a sodium acrylate solution with the concentration of 8 wt%;
S2, adding acrylamide into the sodium acrylate solution obtained in the step S1, stirring and standing for 4 hours to obtain a mixed solution;
s3, respectively adding 2-vinyl thiophene and ammonium persulfate into the mixed solution obtained in the step S2, heating to 70 ℃, and stirring for reacting for 5 hours to obtain viscous liquid;
S4, taking out the viscous liquid obtained in the step S3, and placing the viscous liquid in an oven for drying and dehydrating, wherein the temperature of the oven is 120 ℃ and the time is 10 hours, so as to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer A3.
Wherein, according to the mass ratio, the 2-vinyl thiophene: sodium propenesulfonate: acrylamide: ammonium persulfate=1: 0.4:0.2:0.08.
Example 4
The embodiment provides a deep well drilling fluid.
4 Parts of bentonite, 1 part of sodium hydroxide, 3 parts of sodium carboxymethyl cellulose, 8 parts of xanthan gum, 20 parts of calcium carbonate, 60 parts of barite and 4 parts of the high-temperature-resistant filtrate reducer A1 prepared in the example 1 are sequentially added into 100 parts of water under stirring, and stirring is continued for 30 minutes, so that the deep well drilling fluid B1 is obtained.
Example 5
The embodiment provides a deep well drilling fluid.
The difference from example 4 is that the high temperature resistant filtrate reducer A1 prepared in example 1 was replaced with the high temperature resistant filtrate reducer A2 prepared in example 2 to obtain the deep well drilling fluid B2.
Example 6
The embodiment provides a deep well drilling fluid.
The difference from example 4 is that the high temperature resistant filtrate reducer A1 prepared in example 1 was replaced with the high temperature resistant filtrate reducer A3 prepared in example 3 to obtain the deep well drilling fluid B3.
Experimental example
The experimental example is used for testing the fluid loss of the deep well drilling fluid prepared in the examples 4-6 before and after aging at 220 ℃, and comprises the following specific operations:
The method comprises the steps of firstly testing and recording the filtration loss of the just-prepared deep well drilling fluid in a normal temperature environment by using a high-temperature high-pressure filtration device, then pouring the deep well drilling fluid into an ageing kettle, putting the ageing kettle into a hot rolling furnace, adjusting the temperature of the hot rolling furnace to 220 ℃, taking out the ageing kettle after 24 hours, pouring the aged deep well drilling fluid out, and testing and recording the filtration loss of the aged deep well drilling fluid by using the high-temperature high-pressure filtration device again, wherein the result is shown in table 1.
Table 1 deep well drilling fluid loss
| Sequence number | Filtration loss before aging/mL | Fluid loss/mL after 220 ℃ aging |
| B1 | 2.4 | 6.8 |
| B2 | 2.5 | 6.4 |
| B3 | 2.4 | 6.6 |
| D1 | 2.6 | Full leakage (effective filtration loss can not be measured) |
As can be seen from the data in Table 1, the fluid loss of the deep well drilling fluid prepared in the embodiment still does not exceed 10mL after the deep well drilling fluid is aged at 220 ℃, which indicates that the high temperature resistant fluid loss agent does not lose efficacy due to high temperature, and the deep well drilling fluid still has good fluid loss performance.
Comparative example 1
This comparative example provides a deep well drilling fluid.
The difference from example 4 is that the high temperature resistant filtrate reducer A1 prepared in example 1 was replaced with hydrolyzed polypropylene-ammonium salt (NH 4 -HPAN) as a filtrate reducer, which was purchased from Shimadzu photo-hundred million chemical Co., ltd, to obtain deep well drilling fluid D1.
The filtrate reducer is also used as a polymer, has good filtrate reducing effect when not subjected to a high-temperature environment, but completely fails due to molecular chain fracture after being aged at 220 ℃, and a compact mud cake cannot be formed at the inner bottom of a high-temperature high-pressure filtration instrument, so that drilling fluid in a kettle body of the filtrate instrument is completely leaked.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described.
Claims (10)
1. The high-temperature-resistant fluid loss additive is characterized by comprising the following raw materials in parts by weight:
1 part of 2-vinyl thiophene, 0.2-0.4 part of sodium acrylate, 0.1-0.2 part of acrylamide, 0.05-0.08 part of initiator and 2-40 parts of water.
2. The high temperature resistant fluid loss additive of claim 1, wherein the initiator is ammonium persulfate.
3. The method for preparing the high temperature resistant fluid loss additive according to claim 1 or 2, which is characterized by comprising the following steps:
s1, mixing water with sodium acrylate to obtain a sodium acrylate solution;
S2, mixing the sodium acrylate solution obtained in the step S1 with acrylamide to obtain a mixed solution;
s3, heating and stirring the mixed solution obtained in the step S2 with 2-vinyl thiophene and an initiator for reaction to obtain viscous liquid;
S4, drying and dehydrating the viscous liquid obtained in the step S3 to obtain a solid block;
And S5, grinding and crushing the solid block obtained in the step S4 to obtain the high-temperature-resistant filtrate reducer.
4. The method for preparing a high temperature resistant fluid loss additive according to claim 3, wherein in the step S2, the standing time is 3-4 hours.
5. The method for producing a high temperature resistant fluid loss additive according to claim 3, wherein in step S3, the heating temperature is 60 to 70 ℃.
6. The method for preparing a high temperature resistant fluid loss additive according to claim 3, wherein in the step S3, the reaction time is 4-5 hours.
7. The method for preparing a high temperature resistant fluid loss additive according to claim 3, wherein in the step S4, the drying temperature is 110-130 ℃ and the time is 8-10 h.
8. The use of the high temperature resistant fluid loss additive of claim 1 or 2 in the technical field of drilling fluids.
9. The use of the high temperature resistant fluid loss additive in the drilling fluid technical field according to claim 8, wherein the temperature range of the use is 200-220 ℃ and the high temperature range of the use is 200-220 ℃.
10. The deep well drilling fluid is characterized by comprising the following raw material components in parts by weight:
100 parts of water, 4-6 parts of bentonite, 1-2 parts of sodium hydroxide, 3-5 parts of sodium carboxymethylcellulose, 8-10 parts of xanthan gum, 20-24 parts of calcium carbonate, 60-70 parts of barite and 4-8 parts of high temperature resistant filtrate reducer;
The high temperature resistant filtrate reducer is the high temperature resistant filtrate reducer of claim 1 or 2.
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| CN202211222025.7A CN117886996A (en) | 2022-10-08 | 2022-10-08 | High-temperature-resistant filtrate reducer, preparation method and application thereof, and deep well drilling fluid |
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| CN202211222025.7A CN117886996A (en) | 2022-10-08 | 2022-10-08 | High-temperature-resistant filtrate reducer, preparation method and application thereof, and deep well drilling fluid |
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