CN112574723B - Organic soil for drilling fluid and preparation method thereof - Google Patents
Organic soil for drilling fluid and preparation method thereof Download PDFInfo
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- CN112574723B CN112574723B CN201910931191.6A CN201910931191A CN112574723B CN 112574723 B CN112574723 B CN 112574723B CN 201910931191 A CN201910931191 A CN 201910931191A CN 112574723 B CN112574723 B CN 112574723B
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- 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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- C01B33/20—Silicates
- C01B33/36—Silicates having base-exchange properties but not having molecular sieve properties
- C01B33/38—Layered base-exchange silicates, e.g. clays, micas or alkali metal silicates of kenyaite or magadiite type
- C01B33/44—Products obtained from layered base-exchange silicates by ion-exchange with organic compounds such as ammonium, phosphonium or sulfonium compounds or by intercalation of organic compounds, e.g. organoclay material
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Abstract
The invention belongs to the technical field of petrochemical industry, and particularly relates to a preparation method of organic soil for drilling fluid. The organic modification of sodium bentonite with octadecyl trimethyl ammonium bromide is carried out, then the sodium bentonite is dried, the refined attapulgite is also dried and roasted after the organic modification with dodecyl trimethyl ammonium bromide, and then the sodium bentonite and auxiliary agents of carboxymethyl cellulose and polyacrylic acid are dissolved and mixed according to a specific proportion to prepare the organic soil for the high-performance drilling fluid. By the action of the compound organic soil and the auxiliary agent, the thixotropy, viscosity and lubricity of the organic soil product are effectively improved, so that the overall expansion performance, thermal stability and fluid loss resistance of the organic soil are greatly improved.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to organic soil for drilling fluid and a preparation method thereof.
Background
The oil-based drilling fluid is a type of drilling fluid used for drilling complex formations, and is particularly suitable for drilling mud shale formations with high hydration collapse pressure. The oil-based drilling fluid used in China comprises two well-deep shale formations, wherein one shale formation is a shale formation with lower temperature, such as a shale gas formation drilled at present; the other is a shale formation with higher temperature, such as a deep-well shale formation in a Tarim oil field. The organic soil is the most basic oleophilic colloid in the oil-based drilling fluid, can improve the viscosity and the shearing force of mud in the oil-based drilling fluid and reduce the filtration loss of the oil-based drilling fluid, and is an indispensable additive in the oil-based drilling fluid.
The organic soil is a modified deep-processing product and is also an important fine chemical product. Because of its hydrophobic and oleophilic property, it has good dispersibility, solubilization and emulsibility in organic solvent, so that it can be extensively used as anti-settling agent, thickening agent, viscosity-increasing agent and suspension agent in the industrial fields of paint, printing ink, high-temp. lubricating grease, cosmetics, casting, petroleum drilling and pesticide, etc. The organic soil is produced by using cationic surfactant as modifier and through wet, dry or pre-gel process to perform intercalation ion exchange on sodium base soil, etc. to change hydrophilic and oleophobic property into lipophilic and hydrophobic organic soil. It has also been studied to use a cationic surfactant in combination with a nonionic surfactant or an anionic surfactant as a modifier. In addition, nonionic surfactants, alkylamines, amino acids, coupling agents, alcohols, or the like are also used for intercalation or surface modification of organic soils.
The organic soil mainly plays a role in increasing viscosity and improving cutting in the drilling fluid, and the rheological property and the rock carrying capacity of the drilling fluid are directly influenced by the quality of the performance of the organic soil. In order to improve the gel property and the viscosity-increasing and shear-improving effect of the organic soil for the drilling fluid in an oil-based drilling fluid system, research on the preparation of the organic soil for the oil-based drilling fluid is carried out.
Disclosure of Invention
The invention aims to provide a preparation method of organic soil for composite drilling fluid, which improves the gelling property and the viscosity-increasing and shear-improving effects of the drilling fluid.
The thixotropic property, viscosity and lubricity of an organic soil product can be effectively improved under the action of the composite organic soil and the auxiliary agent, so that the overall expansion performance, thermal stability and fluid loss resistance of the organic soil are greatly improved, and the rheological property and the rock carrying capacity of the oil-based drilling fluid are improved.
The technical scheme is as follows: the purpose of the invention is realized by the following technical scheme:
the organic soil for the drilling fluid provided by the invention mainly comprises the following components: 50-70 parts of organic bentonite powder A; 5-7 parts of organic attapulgite powder B; 2-8 parts of carboxymethyl cellulose; 1-3 parts of polyacrylic acid; and 3-5 parts of water.
The invention also provides a preparation method of the organic soil for the drilling fluid, which comprises the following steps:
(1) adding sodium bentonite powder into deionized water, and stirring to prepare 10-15% by mass of bentonite suspension a;
(2) fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare an octadecyl trimethyl ammonium bromide solution b with the mass percent of 10-15%;
(3) rapidly adding the solution b into the suspension a under stirring, filtering after reaction, and drying the obtained solid to obtain organic bentonite powder A;
(4) adding attapulgite powder into deionized water, and stirring to prepare 5-10% by mass of attapulgite suspension c;
(5) fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a solution d with the mass percent of 10-15%;
(6) rapidly adding the solution d into the suspension c under stirring, filtering after reaction, drying and roasting the obtained solid to obtain organic attapulgite powder B;
(7) and adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water, stirring and mixing, and then filtering, drying and crushing to obtain the organic soil for the drilling fluid.
Preferably, the stirring speed in step (3) is 170-220 rpm.
Preferably, the drying temperature of the powder A in the step (3) is 50-70 ℃.
Preferably, the attapulgite in the step (4) is attapulgite treated at 50 ℃ for 3 hours with 5% hydrochloric acid.
Preferably, the drying temperature of the powder B in the step (5) is 50-70 ℃.
Preferably, the calcination temperature in step (5) is 200 ℃ to 300 ℃.
Preferably, the stirring speed in step (6) is 170-220 rpm/s.
Preferably, the drying temperature of the organic soil in the step (7) is 50-70 ℃.
Preferably, the reaction times in steps (3) and (6) are both 2 h.
Advantageous effects
The method provided by the method can effectively improve the rheological property, the temperature resistance and the fluid loss resistance of the organic soil. The organic soil for the drilling fluid provided by the invention can greatly improve the viscosity-increasing and shear-improving effects of the drilling fluid and improve the rheological property and the rock-carrying capacity of the oil-based drilling fluid.
Detailed Description
The present invention is further illustrated by the following examples, but the scope of the invention is not limited thereto.
Example 1
Adding sodium bentonite powder into deionized water, and preparing 10% bentonite suspension a under high-speed stirring at 170 rpm; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 170 r/s, reacting for 2 hours at 50 ℃, filtering, and drying the obtained solid at 50 ℃ to obtain the organobentonite powder A. Adding attapulgite powder treated for 3 hours at 50 ℃ with 5% hydrochloric acid into deionized water, and preparing 5% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution d; and (3) rapidly adding the solution d into the suspension B under high-speed stirring at 12000 r/min, reacting at 50 ℃ for 2 hours, filtering, drying the obtained solid at 50 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
Adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to the ratio of 50:5:2:1, stirring at a high speed of 170 revolutions per second, mixing, filtering, drying and crushing at 50 ℃ to obtain an organic soil sample N1. The properties of the sample measured according to GB/T16783.2-2012 were apparent viscosity 10.15 mpa.s, plastic viscosity 9 mpa.s, shear force 2.13pa and low temperature and low pressure filtration loss 14.0 ml.
Example 2
Adding sodium bentonite powder into deionized water, and preparing 10% bentonite suspension a under high-speed stirring at 200 r/s; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 200 r/s, reacting for 2 hours at 50 ℃, filtering, and drying the obtained solid at 60 ℃ to obtain the organobentonite powder A. Adding attapulgite powder treated for 3 hours at 50 ℃ by 5% hydrochloric acid into deionized water, and preparing 5% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution d; and (3) rapidly adding the solution d into the suspension B under high-speed stirring at 200 r/s, reacting at 50 ℃ for 2 hours, filtering, drying the obtained solid at 60 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
And adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to a ratio of 60:6:4:2, stirring at a high speed of 200 r/s, mixing, filtering, drying and crushing at 60 ℃ to obtain an organic soil sample N2. The properties of the sample measured according to GB/T16783.2-2012 were apparent viscosity 10.45 mpa.s, plastic viscosity 9 mpa.s, shear force 2.28pa and low temperature and low pressure filtration loss 13.8 ml.
Example 3
Adding sodium bentonite powder into deionized water, and preparing 10% bentonite suspension a under high-speed stirring at 220 r/s; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 220 r/s, reacting for 2 hours at 70 ℃, filtering, and drying the obtained solid at 70 ℃ to obtain the organobentonite powder A. Adding attapulgite powder treated for 3 hours at 50 ℃ by 5% hydrochloric acid into deionized water, and preparing 5% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 10% solution d; and (3) rapidly adding the solution d into the suspension B under the high-speed stirring of 220 r/s, reacting for 2 hours at 70 ℃, filtering, drying the obtained solid at 70 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
And adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to a ratio of 70:7:8:3, stirring at a high speed of 220 r/s, mixing, filtering, drying and crushing at 70 ℃ to obtain an organic soil sample N3. The properties of the sample measured according to GB/T16783.2-2012 were apparent viscosity 11..2 mpa-s, plastic viscosity 9.5 mpa-s, shear force 2.40pa and low temperature and low pressure fluid loss 13.2 ml.
Example 4
Adding sodium bentonite powder into deionized water, and preparing a suspension a of 15% bentonite under high-speed stirring at 170 rpm; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 15 percent solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 170 revolutions per second, reacting for 2 hours at 50 ℃, filtering, and drying the obtained solid at 50 ℃ to obtain the organobentonite powder A. Adding attapulgite powder treated for 3 hours at 50 ℃ by 5% hydrochloric acid into deionized water, and preparing 10% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 15% solution d; and (3) rapidly adding the solution d into the suspension B under high-speed stirring at 12000 r/min, reacting at 50 ℃ for 2 hours, filtering, drying the obtained solid at 50 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
Adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to the ratio of 50:5:2:1, stirring at a high speed of 170 revolutions per second, mixing, filtering, drying and crushing at 50 ℃ to obtain an organic soil sample N1. The properties of the sample measured according to GB/T16783.2-2012 were apparent viscosity 10.75 mpa.s, plastic viscosity 9 mpa.s, shear force 2.30pa and low temperature and low pressure filtration loss 11.7 ml.
Example 5
Adding sodium bentonite powder into deionized water, and preparing a suspension a of 15% bentonite under high-speed stirring at 200 revolutions per second; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 15% solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 200 r/s, reacting for 2 hours at 50 ℃, filtering, and drying the obtained solid at 60 ℃ to obtain the organobentonite powder A. Adding attapulgite powder treated for 3 hours at 50 ℃ by 5% hydrochloric acid into deionized water, and preparing 10% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 15% solution d; and (3) rapidly adding the solution d into the suspension B under high-speed stirring at 200 r/s, reacting at 50 ℃ for 2 hours, filtering, drying the obtained solid at 60 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
And adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to a ratio of 60:6:4:2, stirring at a high speed of 200 r/s, mixing, filtering, drying and crushing at 60 ℃ to obtain an organic soil sample N2. The properties of the sample measured according to GB/T16783.2-2012 were apparent viscosity 11.4 mpa.s, plastic viscosity 9.5 mpa.s, shear force 2.56pa and low temperature and low pressure filtration loss 11.2 ml.
Example 6
Adding sodium bentonite powder into deionized water, and preparing a suspension a of 15% bentonite under high-speed stirring at 220 r/s; fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare a 15 percent solution b; and (3) rapidly adding the solution b into the suspension a under the high-speed stirring of 220 r/s, reacting for 2 hours at 70 ℃, filtering, and drying the obtained solid at 70 ℃ to obtain the organobentonite powder A. Adding the attapulgite powder treated for 3 hours at 50 ℃ by 10% hydrochloric acid into deionized water, and preparing 5% attapulgite suspension c under high-speed stirring at 170 rpm; fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a 15% solution d; and (3) rapidly adding the solution d into the suspension B under the high-speed stirring of 220 r/s, reacting at 70 ℃ for 2 hours, filtering, drying the obtained solid at 70 ℃, and roasting at 200 ℃ to obtain the organic attapulgite powder B.
And adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water according to a ratio of 70:7:8:3, stirring at a high speed of 220 r/s, mixing, filtering, drying and crushing at 70 ℃ to obtain an organic soil sample N3. The sample properties measured according to GB/T16783.2-2012 were apparent viscosity 12.55 mpa.s, plastic viscosity 10 mpa.s, shear force 2.48pa, low temperature low pressure fluid loss 10.3 ml.
The examples show that the organic soil for the drilling fluid prepared by the method has good rheological property and fluid loss resistance in diesel oil.
Claims (9)
1. An organic soil for drilling fluid, which is characterized in that: comprises the following components: 50-70 parts of organic bentonite powder A; 5-7 parts of organic attapulgite powder B; 2-8 parts of carboxymethyl cellulose; 1-3 parts of polyacrylic acid; 3-5 parts of water;
the preparation method of the organic soil for the drilling fluid comprises the following steps:
(1) adding sodium bentonite powder into deionized water, and stirring to prepare 10-15% by mass of bentonite suspension a;
(2) fully dissolving octadecyl trimethyl ammonium bromide in ethanol to prepare 10-15 percent of octadecyl trimethyl ammonium bromide solution b by mass percentage;
(3) rapidly adding the solution b into the suspension a under stirring, filtering after reaction, and drying the obtained solid to obtain organic bentonite powder A;
(4) adding attapulgite powder into deionized water, and stirring to prepare 5-10% by mass of attapulgite suspension c;
(5) fully dissolving dodecyl trimethyl ammonium bromide in ethanol to prepare a solution d with the mass percent of 10-15%;
(6) rapidly adding the solution d into the suspension c under stirring, filtering after reaction, drying and roasting the obtained solid to obtain organic attapulgite powder B;
(7) and adding the powder A, the powder B, the carboxymethyl cellulose and the polyacrylic acid into deionized water, stirring and mixing, and then filtering, drying and crushing to obtain the organic soil for the drilling fluid.
2. The preparation method as claimed in claim 1, wherein the stirring speed in step (3) is 170-220 rpm/s.
3. The method according to claim 1, wherein the drying temperature of the powder A in the step (3) is 50 to 70 ℃.
4. The method according to claim 1, wherein the attapulgite powder in the step (4) is attapulgite treated at 50 ℃ with 5% hydrochloric acid for 3 hours.
5. The method according to claim 1, wherein the drying temperature of the powder B in the step (5) is 50 to 70 ℃.
6. The method according to claim 1, wherein the calcination temperature in the step (5) is 200 ℃ to 300 ℃.
7. The preparation method as claimed in claim 1, wherein the stirring speed in step (6) is 170-220 rpm/s.
8. The method according to claim 1, wherein the temperature for drying the organic soil in the step (7) is 50 to 70 ℃.
9. The process according to claim 1, wherein the reaction time in each of the steps (3) and (6) is 2 hours.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108251084A (en) * | 2018-03-19 | 2018-07-06 | 田东昊润新材料科技有限公司 | A kind of compound probing slurry coat method soil of coal measure strata |
| CN109072057A (en) * | 2016-04-01 | 2018-12-21 | 沙特阿拉伯石油公司 | The improvement of bentonite property for drilling fluid |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109072057A (en) * | 2016-04-01 | 2018-12-21 | 沙特阿拉伯石油公司 | The improvement of bentonite property for drilling fluid |
| CN108251084A (en) * | 2018-03-19 | 2018-07-06 | 田东昊润新材料科技有限公司 | A kind of compound probing slurry coat method soil of coal measure strata |
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Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Patentee after: CHINA PETROLEUM & CHEMICAL Corp. Patentee after: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Address before: Liuhe District of Nanjing City, Jiangsu province 210048 geguan Road No. 699 Patentee before: SINOPEC NANJING CHEMICAL RESEARCH INSTITUTE Co.,Ltd. Patentee before: CHINA PETROLEUM & CHEMICAL Corp. |