Preparation method of organic bentonite for environment-friendly drilling fluid
阅读说明：本技术 环保型钻井液用有机膨润土的制备方法 (Preparation method of organic bentonite for environment-friendly drilling fluid ) 是由 祝东红 董天雷 田先国 于 2019-10-28 设计创作，主要内容包括：本发明属于石油化工技术领域,涉及一种环保型钻井液用有机膨润土的制备方法。将提纯后的天然钠基膨润土干料溶于水中,形成悬浮体系a；将有机改性剂溶于二甲苯,形成均一体系b；将助剂A二甲苯中,形成均一体系c,在搅拌状态下,将体系b加入到悬浮体系a中,调节体系pH值为7～8,反应形成均一体系d；在搅拌状态下,将体系c加入悬浮体系d中反应,将产物冷却至室温,洗涤过滤,干燥,粉碎过筛,到产品。本发明方法可以制备出环保的钻井液用有机膨润土,在体系中具有良好的流变性能和配伍性能。(The invention belongs to the technical field of petrochemical industry, and relates to a preparation method of organic bentonite for an environment-friendly drilling fluid. Dissolving the purified natural sodium bentonite dry material in water to form a suspension system a; dissolving an organic modifier in xylene to form a homogeneous system b; forming a uniform system c in an auxiliary agent A xylene, adding the system b into the suspension system a under a stirring state, adjusting the pH value of the system to 7-8, and reacting to form a uniform system d; and (3) adding the system c into the suspension system d under the stirring state for reaction, cooling the product to room temperature, washing, filtering, drying, crushing and sieving to obtain the product. The method can prepare the environment-friendly organic bentonite for the drilling fluid, and has good rheological property and compatibility in a system.)
1. A preparation method of organic bentonite for environment-friendly drilling fluid is characterized by comprising the following steps:
(1) purifying the natural sodium bentonite until the montmorillonite content reaches more than 92%;
(2) dissolving the purified natural sodium bentonite dry material in water, and stirring at a high speed to form a suspension system a with the mass concentration of 4-6%;
(2) dissolving an organic modifier in xylene, stirring and dissolving to form a system b with the mass concentration of 10-15%;
(3) adding an auxiliary agent A with the mass concentration of 10% to react 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 75-85 ℃ for 1-1.5 hours to form a uniform system d;
(5) adding the system c into the suspension system d under the stirring state, and reacting for 0.5-1 hour at the temperature of 75-85 ℃;
(6) and (3) cooling the product obtained in the step (5) to room temperature, washing off redundant ions in the product, filtering, drying the obtained solid product at 65-85 ℃ in a vacuum environment, and crushing and sieving to obtain the organic bentonite product.
2. The method according to claim 1, wherein the natural sodium bentonite contains montmorillonite in an amount of not less than 92% by weight.
3. The method of claim 1 or 2, wherein the natural sodium bentonite has a negative interlaminar charge of between 0.32 and 0.48 per unit cell.
4. The method according to claim 1 or 2, wherein the natural sodium bentonite is natural sodium bentonite from Qitai county, Changji, Xinjiang.
5. The method of claim 1, wherein the organic modifier is dioctadecyldimethylammonium chloride; the adding amount is 30-40% of the mass of the sodium bentonite.
6. The process according to claim 1, wherein the auxiliary A is fatty acid polyoxyethylene ester RCOO (CH)2CH2O)nH（n=9、12、20）。
7. The preparation method according to claim 1, wherein the addition amount of the aid A is 5-10% of the mass of the sodium bentonite.
8. The method according to claim 1, wherein in the step (3), the reaction is carried out for 10 minutes to form a homogeneous system c.
9. The preparation method of claim 1, wherein the mass ratio of sodium bentonite/organic modifier/auxiliary agent A in the system d is 10: 4: 1.
10. the method according to claim 1, wherein in the step (6), the powder is crushed and sieved through a 200-mesh sieve.
Technical Field
The invention belongs to the technical field of petrochemical industry, relates to the technical field of organic soil for drilling fluid, and particularly relates to a preparation method of environment-friendly 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.
Along 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 environment-friendly drilling fluid has good development prospect due to the environmental protection property.
The environment-friendly drilling fluid is used as a novel drilling fluid system with environment-friendly characteristic, not only retains the performance characteristics of the oil-based drilling fluid, but also solves the contradiction between the oil-based drilling fluid and the environmental protection, so that the environment-friendly drilling fluid becomes an essential drilling fluid system in the drilling process of marine complex strata and other land environment sensitive areas.
The organobentonite for the environment-friendly drilling fluid is the most basic oleophilic colloid in the environment-friendly drilling fluid, can improve the viscosity and the shearing force of the drilling fluid and reduce the filter loss of the drilling fluid, and the performance of the organobentonite directly influences the development and the application of the environment-friendly drilling fluid.
The development of the environment-friendly organic soil for the drilling fluid in China is just started, and no related special product is available.
At present, no mature organic bentonite product for environment-friendly drilling fluid exists in the market, the existing organic soil product is mainly applied to the traditional oil-based drilling fluid, the defects of poor rheological property, low slurrying property and the like exist in an environment-friendly drilling fluid system, and the field application is difficult, so the research on the preparation of the organic bentonite for the environment-friendly drilling fluid is carried out.
Disclosure of Invention
The invention aims to provide a preparation method of organic bentonite for environment-friendly drilling fluid.
The main technical scheme of the invention is as follows: the preparation method of the organic bentonite for the environment-friendly drilling fluid comprises the following steps:
(1) purifying the natural sodium bentonite until the montmorillonite content reaches more than 92%;
(2) dissolving the purified natural sodium bentonite dry material in water, and stirring at a high speed to form a suspension system a with the mass concentration of 4-6%;
(2) dissolving an organic modifier in xylene, stirring and dissolving to form a system b with the mass concentration of 10-15%;
(3) adding an auxiliary agent A with the mass concentration of 10% to react 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 75-85 ℃ for 1-1.5 hours to form a uniform system d;
(5) adding the system c into the suspension system d under the stirring state, and reacting for 0.5-1 hour at the temperature of 75-85 ℃;
(6) and (3) cooling the product obtained in the step (5) to room temperature, washing off redundant ions in the product, filtering, drying the obtained solid product at 65-85 ℃ in a vacuum environment, and crushing and sieving to obtain the organic bentonite product.
Preferably, the weight percentage content of montmorillonite in the natural sodium bentonite is more than or equal to 92 percent.
The natural sodium bentonite has an interlayer negative charge of 0.32-0.48 per unit cell.
The natural sodium bentonite is natural sodium bentonite in Qitai county of Changji state, Xinjiang.
The organic modifier is dioctadecyl dimethyl ammonium chloride; the adding amount is 30-40% of the mass of the sodium bentonite.
The additive A is fatty acid polyoxyethylene ester RCOO (CH)2CH2O)nH（n=9、12、20）。
The addition amount of the additive A is 5-10% of the mass of the sodium bentonite.
In the step (3), the reaction is carried out for 10 minutes to form a homogeneous system c.
In the system d, the mass ratio of sodium bentonite/organic modifier/auxiliary agent A is 10: 4: 1.
in the step (6), the mixture is crushed and sieved by a 200-mesh sieve.
The interlayer negative charge of the natural bentonite raw ore adopted by the invention is between 0.32 and 0.48 per unit cell, the weight percentage content of the obtained sodium bentonite montmorillonite is more than or equal to 92 percent, and the expansion capacity is more than or equal to 108 ml/g.
The organic bentonite prepared by the invention has good rheological property in an environment-friendly drilling fluid system.
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 water, stirring at a high speed to obtain a suspension with a concentration of 5% stably, and adjusting the pH value of the suspension to 7-8 for later use; 32 parts of dioctadecyl dimethyl ammonium chloride is dissolved in water with the concentration of 12 percent and is stirred evenly to become clear and transparent solution for standby. 6 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 9) was dissolved in water, stirred uniformly, heated to 80 ℃ to make a clear and transparent solution at 8% concentration for use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts for 1.5 hours at the temperature of 75 ℃, the prepared auxiliary agent is continuously added, and the stirring reaction is carried out for 1 hour. Cooling the product to room temperature, repeatedly washing with deionized water, filtering, 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 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; dissolving 22 parts of dioctadecyl dimethyl ammonium chloride in 200 parts of dimethylbenzene, and uniformly stirring to obtain 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, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 room temperature, repeatedly washing with deionized water, filtering,and (3) drying the prepared organic bentonite at 75 ℃ in vacuum, crushing and sieving by a 200-mesh sieve to obtain an 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 dioctadecyl dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene, and the solution is uniformly stirred to become clear and transparent solution for later use. 11 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 20) was dissolved in 100 parts of deionized water, stirred uniformly, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 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.
Example 4
Dispersing 60 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; dissolving 22 parts of dioctadecyl dimethyl ammonium chloride in 200 parts of dimethylbenzene, and uniformly stirring to obtain a clear and transparent solution for later use. 11 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 9) was dissolved in 100 parts of deionized water, stirred uniformly, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 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.
Example 5
Dispersing 70 parts of sodium-based soil into 1500 parts of deionized water, and stirring at high speed to obtain the productDetermining a suspension, and adjusting the pH value of the suspension to 7-8 for later use; 26 parts of dioctadecyl 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)nH (n = 12) was dissolved in 100 parts of deionized water, stirred uniformly, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 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.
Example 6
Dispersing 85 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; 28 parts of dioctadecyl 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)nH (n = 12) was dissolved in 100 parts of deionized water, stirred uniformly, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 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.
Example 7
Dispersing 65 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; 25 parts of dioctadecyl dimethyl ammonium chloride is dissolved in 200 parts of dimethylbenzene, and the solution is uniformly stirred to become clear and transparent solution for later use. 12 parts of polyoxyethylene fatty acid ester RCOO (CH)2CH2O)nH (n = 20) was dissolved in 100 parts of deionized water, stirred uniformly, and heated to 80 ℃ to obtain a clear and transparent solution for later use. Under the high-speed stirring state, the dioctadecyl dimethyl ammonium chloride solution is quickly added into the suspension liquid, reacts 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 environment-friendly drilling fluid is detected, and the result shows that compared with the common organic soil, the performance of the organic soil in the environment-friendly drilling fluid is obviously improved, and the drilling fluid prepared by adopting the organic soil has good rheological property.
Measurement results of organic soil Performance test
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