CN112645342A - Preparation method of organic bentonite for drilling fluid - Google Patents
Preparation method of organic bentonite for drilling fluid Download PDFInfo
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- CN112645342A CN112645342A CN201910965683.7A CN201910965683A CN112645342A CN 112645342 A CN112645342 A CN 112645342A CN 201910965683 A CN201910965683 A CN 201910965683A CN 112645342 A CN112645342 A CN 112645342A
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- C01B33/00—Silicon; Compounds thereof
- 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
- C01B33/40—Clays
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- 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
- C09K8/32—Non-aqueous well-drilling compositions, e.g. oil-based
- C09K8/34—Organic liquids
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Abstract
The invention relates to a preparation method of organic bentonite for drilling fluid. Dissolving the sodium bentonite dry material in water, and stirring to form a suspension system a; dissolving the organic modifier in xylene, and stirring to dissolve to form a system b; dissolving the auxiliary A in deionized water, stirring, dissolving and heating, adding the auxiliary B, and reacting to form a uniform system c; adding the system b into the suspension system a under stirring, and reacting to form a uniform system d; and (3) adding the system c into the suspension system d under stirring, cooling, washing, filtering, drying, crushing and sieving the reaction product to obtain the organic bentonite for the drilling fluid. The organic bentonite prepared by the method has good rheological property and compatibility in a system.
Description
Technical Field
The invention belongs to the technical field of petrochemical industry, and particularly relates to a preparation method of organic bentonite for drilling fluid.
Background
With the development of drilling technology and the sound perfection of environmental protection laws and regulations, the water-based drilling fluid can not meet the requirements of complex underground geological conditions gradually, the oil-based drilling fluid can not meet the environmental protection requirements well, and the application and popularization are limited to a certain degree.
The oil-based drilling fluid is also a main drilling fluid system for shale oil gas development, and the oil-based mud commonly used in China is mainly a diesel oil system, has high aromatic hydrocarbon content, and has the defects of difficult recovery and environmental pollution. With the enhancement of environmental awareness of people, the use of the traditional oil-based drilling fluid is more and more strictly limited, and the synthetic-based drilling fluid has good development prospect due to the environmental protection property.
The synthetic base drilling fluid is used as a novel drilling fluid system with environmental protection characteristics, not only retains the performance characteristics of the oil-based drilling fluid, but also solves the contradiction between the oil-based drilling fluid and environmental protection, so that the synthetic base drilling fluid becomes an essential drilling fluid system in the drilling process of marine complex strata and other land environment sensitive areas.
Since the first generation of synthetic base drilling fluid is used since the early development of the 90 s abroad, rapid development is achieved due to the unique performance and the advantage of small environmental pollution. In recent years, with the application of second generation synthetic base drilling fluid with better performance, the synthetic base drilling fluid system is gradually improved, and the field application in foreign countries reaches a considerable scale.
The organic bentonite for the synthetic base drilling fluid is the most basic oleophylic colloid in the synthetic base drilling fluid, can improve the viscosity and the shear force of the drilling fluid and reduce the filtration loss of the drilling fluid, and the performance of the organic bentonite directly influences the development and the application of the synthetic base drilling fluid.
The development of organic soil for synthetic base drilling fluid in China is just started, and no related special product exists. At present, no mature organic bentonite product for synthetic base drilling fluid exists in the market, the existing organic soil product is mainly applied to the traditional oil base drilling fluid, the defects of poor rheological property, low slurrying property and the like exist in a synthetic base drilling fluid system, and the field application is difficult, so that the development of the preparation method of the organic bentonite for the synthetic base drilling fluid is urgent.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a preparation method of organic bentonite for synthetic base drilling fluid, and the organic bentonite prepared by the invention has good rheological property in a synthetic base drilling fluid system.
The technical scheme is as follows: the purpose of the invention is realized by the following technical scheme:
the invention provides a preparation method of organic bentonite for synthetic base drilling fluid, which comprises the following steps:
(1) dissolving sodium bentonite dry material in water, and forming a suspension system a with the mass concentration of 5-7% under the stirring condition;
(2) dissolving an organic modifier in xylene, stirring and dissolving to form a system b with the mass concentration of 10-15%;
(3) dissolving the auxiliary agent A in deionized water, stirring for dissolving, heating, continuously adding the auxiliary agent B, and reacting to form a uniform system c;
(4) adding the system b into the suspension system a under the stirring state, adjusting the pH value of the system to 7-8, and reacting at 70-90 ℃ for 1-2 hours to form a uniform system d;
(5) and (3) adding the system c into a suspension system d under a stirring state, and reacting for 0.5-1 hour at 70-90 ℃, wherein the mass ratio of sodium bentonite/organic modifier/auxiliary agent A + B in the system d is 10: 4: 1;
(6) and (3) cooling the product obtained in the step (5), washing off redundant ions in the product, filtering, drying the obtained solid product at the temperature of 60-80 ℃ in a vacuum environment, and sieving to obtain the organic bentonite for the drilling fluid.
Preferably, the sodium bentonite dry material in the step (1) is prepared by purifying natural sodium bentonite montmorillonite raw ore, and the weight percentage content of montmorillonite in the sodium bentonite is more than or equal to 95%.
Preferably, the natural sodium bentonite raw ore has an interlaminar negative charge of between 0.3 and 0.45 per unit cell.
Preferably, the natural sodium bentonite montmorillonite raw ore in qitai county, changji, xinjiang is used.
Preferably, the organic modifier in the step (2) is di-hydrogenated tallow dimethyl ammonium chloride; the adding amount is 35 to 40 percent of the mass of the sodium bentonite.
Preferably, the aid A in the step (3) is polyoxyethylene fatty acid ester.
Preferably, the fatty acidThe polyoxyethylene ester is RCOO (CH)2CH2O)nH（n=9、12、20）。
Preferably, in the step (3), the assistant A with the mass concentration of 6% is dissolved in deionized water, stirred and dissolved, heated to 80 ℃, and added with the assistant B with the mass concentration of 4% continuously to react for 10 minutes to form a homogeneous system c.
Preferably, the assistant B in the step (3) is a carboxylic acid polymer (C)6H7O2（OH）2CH2COONa）n。
Preferably, in the step (3), the addition amount of the aid A is 5-10% of the mass of the sodium bentonite, and the addition amount of the aid B is 3-5% of the mass of the sodium bentonite.
Preferably, in the step (6), the product obtained in the step (5) is cooled to 25 ℃, redundant ions in the product are washed away, the product is filtered, the obtained solid product is dried in a vacuum environment at 60-80 ℃, and the solid product is crushed and sieved by a 200-mesh sieve.
Advantageous effects
The organic soil prepared by the method has good rheological property in a synthetic base drilling fluid system. The problems of insufficient performance and high preparation proportion of the current domestic organic soil in a synthetic matrix system can be solved, and the drilling cost is effectively saved.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
Dispersing 80 parts of sodium-based soil into 1520 parts of water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 32 parts of dihydrogenated tallow dimethyl ammonium chloride is dissolved in 234 parts of dimethylbenzene, and the mixture is uniformly stirred to form a clear and transparent solution for later use. 6 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 9) was dissolved in 90 parts of water, stirred uniformly, heated to 80 ℃, and 4 parts of carboxylic acid polymer was added and reacted for 10 minutes to obtain a clear and transparent solution. Under the condition of high-speed stirring, the solution of di-hydrogenated tallow dimethyl ammonium chloride is quickly added into suspensionReacting at 75 deg.c for 1.5 hr, adding the prepared assistant and stirring for 1 hr. Cooling the product to 25 ℃, repeatedly washing with deionized water, filtering, and vacuum drying the prepared organic bentonite at 70 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
Example 2
Dispersing 60 parts of sodium-based soil into 940 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 22 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 11 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 12) was dissolved in 100 parts of deionized water, stirred uniformly, heated to 80 ℃, and 14 parts of carboxylic acid polymer was added and reacted for 10 minutes to obtain a clear and transparent solution. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension, the reaction is carried out for 1.6 hours at the temperature of 70 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 0.9 hour. Cooling the product to 25 ℃, repeatedly washing with deionized water, filtering, vacuum drying the prepared organic bentonite at 75 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
Example 3
Dispersing 65 parts of sodium-based soil into 1000 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 25 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 11 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nDissolving H (n = 20) in 100 parts of deionized water, stirring uniformly, heating to 80 ℃, adding 10 parts of carboxylic acid polymer continuously, and reacting for 10 minutes to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension, the reaction is carried out for 1.5 hours at the temperature of 80 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 0.5 hour. The product is cooled to 25 ℃, washed repeatedly by deionized water,filtering, vacuum drying the prepared organic bentonite at 60 ℃, crushing and sieving by a 200-mesh sieve to obtain the organic bentonite product.
Example 4
Dispersing 50 parts of sodium-based soil into 800 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 22 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 11 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nDissolving H (n = 9) in 100 parts of deionized water, stirring uniformly, heating to 80 ℃, adding 14 parts of carboxylic acid polymer continuously, and reacting for 10 minutes to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension, the reaction is carried out for 1 hour at the temperature of 90 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 0.5 hour. Cooling the product to 25 ℃, repeatedly washing with deionized water, filtering, and vacuum drying the prepared organic bentonite at 80 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
Example 5
Dispersing 70 parts of sodium-based soil into 930 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 26 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 13 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nDissolving H (n = 12) in 100 parts of deionized water, stirring uniformly, heating to 80 ℃, adding 7 parts of carboxylic acid polymer continuously, and reacting for 10 minutes to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension to react for 2 hours at the temperature of 85 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 1 hour. Cooling the product to 25 ℃, repeatedly washing with deionized water, filtering, and vacuum drying the prepared organic bentonite at 60 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
Example 6
Dispersing 85 parts of sodium-based soil into 1215 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 28 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 10 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nDissolving H (n = 12) in 100 parts of deionized water, stirring uniformly, heating to 80 ℃, adding 6 parts of carboxylic acid polymer continuously, and reacting for 10 minutes to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension to react for 1.5 hours at the temperature of 70 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 1 hour. Cooling the product to 25 ℃, repeatedly washing with deionized water, filtering, vacuum drying the prepared organic bentonite at 75 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
Example 7
Dispersing 65 parts of sodium-based soil into 1235 parts of deionized water, stirring at a high speed to obtain a stable suspension, and adjusting the pH value of the suspension to 7-8 for later use; 25 parts of di-hydrogenated tallow dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene and is stirred uniformly to form a clear and transparent solution for later use. 12 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nDissolving H (n = 20) in 100 parts of deionized water, stirring uniformly, heating to 80 ℃, adding 10 parts of carboxylic acid polymer continuously, and reacting for 10 minutes to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the solution of the ammonium di-hydrogenated tallow dimethyl chloride is quickly added into the suspension to react for 2 hours at the temperature of 70 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 0.5 hour. Cooling the product to room temperature, repeatedly washing with deionized water, filtering, vacuum drying the prepared organic bentonite at 75 ℃, crushing and sieving with a 200-mesh sieve to obtain the organic bentonite product.
The performance of the obtained organic soil in the synthetic-base drilling fluid is detected, and the result shows that compared with the common organic soil, the performance of the organic soil in the synthetic-base drilling fluid is obviously improved, the drilling fluid prepared by the organic soil has excellent shearing resistance in the field use process, the drilling fluid is operated for more than 7 days at continuous high temperature (160 ℃), the loss rate of the organic soil is less than or equal to 10 percent, and the requirements of field application are completely met, and the specific table 1 shows.
TABLE 1 determination results of organic soil Performance test
Claims (10)
1. The preparation method of the organic bentonite for the drilling fluid is characterized by comprising the following steps:
(1) dissolving sodium bentonite dry material in water, and forming a suspension system a with the mass concentration of 5-7% under the stirring condition;
(2) dissolving an organic modifier in xylene, stirring and dissolving to form a system b with the mass concentration of 10-15%;
(3) dissolving the auxiliary agent A in deionized water, stirring for dissolving, heating, continuously adding the auxiliary agent B, and reacting to form a uniform system c;
(4) adding the system b into the suspension system a under the stirring state, adjusting the pH value of the system to 7-8, and reacting at 70-90 ℃ for 1-2 hours to form a uniform system d;
(5) and (3) adding the system c into a suspension system d under a stirring state, and reacting for 0.5-1 hour at 70-90 ℃, wherein the mass ratio of sodium bentonite/organic modifier/auxiliary agent A + B in the system d is 10: 4: 1;
(6) and (3) cooling the product obtained in the step (5), washing off redundant ions in the product, filtering, drying the obtained solid product at the temperature of 60-80 ℃ in a vacuum environment, and sieving to obtain the organic bentonite for the drilling fluid.
2. The preparation method according to claim 1, wherein the dried sodium bentonite in step (1) is prepared by purifying natural sodium bentonite raw ore, and the weight percentage of montmorillonite in the sodium bentonite is not less than 95%.
3. The method according to claim 2, wherein the natural sodium bentonite raw ore has a negative interlaminar charge of 0.3 to 0.45 per unit cell.
4. The method according to claim 1, wherein the organic modifier in step (2) is di-hydrogenated tallow dimethyl ammonium chloride, and the amount added is 35-40% of the mass of the sodium bentonite.
5. The preparation method according to claim 1, wherein in the step (3), the assistant A with the mass concentration of 6% is dissolved in deionized water, stirred and dissolved, heated to 80 ℃, and the assistant B with the mass concentration of 4% is continuously added to react for 10 minutes to form the homogeneous system c.
6. The method according to claim 1, wherein in the step (3), the auxiliary agent A is polyoxyethylene fatty acid ester.
7. The method according to claim 6, wherein the polyoxyethylene fatty acid ester is RCOO (CH)2CH2O)nH, wherein n is 9, 12 or 20.
8. The process according to claim 1, wherein in the step (3), the assistant B is a carboxylic acid polymer (C)6H7O2（OH）2CH2COONa）n。
9. The production method according to claim 1 or 5, wherein in the step (3), the addition amount of the aid A is 5 to 10% by mass of the sodium bentonite, and the addition amount of the aid B is 3 to 5% by mass of the sodium bentonite.
10. The preparation method according to claim 1, wherein in the step (6), the product obtained in the step (5) is cooled to 25 ℃, redundant ions in the product are washed away, the product is filtered, the obtained solid product is dried in a vacuum environment at 60-80 ℃, and the dried solid product is crushed and sieved by a 200-mesh sieve.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101480A (en) * | 1980-10-03 | 1987-01-24 | 南方粘土产品公司 | Has the process for manufacturing organoclays that strengthens gelling properties |
| CN104211075A (en) * | 2013-06-04 | 2014-12-17 | 中国石油化工股份有限公司 | Preparation method of organic bentonite for oil based drilling fluid |
| CN109705823A (en) * | 2017-10-25 | 2019-05-03 | 中国石油化工股份有限公司 | Synthetic base drilling fluid method for preparing organobentonite |
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- 2019-10-12 CN CN201910965683.7A patent/CN112645342A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85101480A (en) * | 1980-10-03 | 1987-01-24 | 南方粘土产品公司 | Has the process for manufacturing organoclays that strengthens gelling properties |
| CN104211075A (en) * | 2013-06-04 | 2014-12-17 | 中国石油化工股份有限公司 | Preparation method of organic bentonite for oil based drilling fluid |
| CN109705823A (en) * | 2017-10-25 | 2019-05-03 | 中国石油化工股份有限公司 | Synthetic base drilling fluid method for preparing organobentonite |
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