Leakage-proof plugging water-based drilling fluid composition as well as preparation method and application thereof
A technology for water-based drilling fluid and composition, which is applied in drilling compositions, chemical instruments and methods, and earth-moving drilling and mining, etc., can solve the problem that formation cracks cannot be effectively plugged, and achieve the goal of inhibiting mud and sandstone water. Chemical problems, excellent quality, and the effect of preventing blocks from falling off the well wall
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preparation example Construction
[0020] The first aspect of the present invention provides a preparation method of a modified calcium carbonate leakage prevention and plugging agent, wherein the preparation method comprises:
[0021] (1) contacting purified calcium carbonate with modifier to form dispersion;
[0022] (2) contacting the dispersion liquid with the activator to carry out surface modification treatment, and carrying out solid-liquid separation, drying and ultrasonic peeling treatment of the obtained mixture to obtain a modified calcium carbonate leak-proof and plugging agent;
[0023] Wherein, the modifier is polydimethylsiloxane, and the activator is fatty acid.
[0024] The inventors of the present invention found that: using the method of the present invention to carry out surface modification treatment on the purified calcium carbonate, the particle size distribution of the obtained modified calcium carbonate leakage prevention and plugging agent is 500-15000 mesh, with extremely small partic...
Embodiment approach
[0056] According to a preferred embodiment of the present invention, a preparation method of a water-based drilling fluid composition for leakage prevention and plugging includes:
[0057] (S1) pure water above 50-80 DEG C or tap water is added the required amount of bentonite to obtain mixed solution 1;
[0058] (S2) adding the required amount of alkalinity regulator to the mixed solution 1 obtained in step (S1) and stirring, adjusting the pH value of the system to 9-10, and prehydrating for 16-24h to obtain the mixed solution 2;
[0059] (S3) under the stirring state of 600-1200r / min, the required amount of inhibitor, fluid loss reducer, modified calcium carbonate leak-proof plugging agent, and anti-slump agent are sequentially added to the mixed solution 2 obtained in step (S2). , and the weighting agent for plugging while drilling is evenly mixed to obtain a water-based drilling fluid for leak-proofing and plugging.
[0060] The fourth aspect of the present invention prov...
preparation example 1
[0075] This preparation example is to illustrate the preparation of the modified calcium carbonate leakage prevention and plugging agent of the present invention.
[0076] (1) Use hot water at 60°C to digest the quicklime, make an emulsion with a concentration of 20%, enter the carbonization tower, pass carbon dioxide to carbonize at a temperature of 900°C, and when the pH value of the suspension is equal to 7 during carbonization As the reaction end point, finely purified calcium carbonate particles were obtained after drying at a high temperature of 80 °C for 3 hours;
[0077] (2) get 10g of purified calcium carbonate particles and disperse them in 100mL of polydimethylsiloxane to form a dispersion;
[0078] (3) Under the condition of 80°C, 20g of oleic acid was introduced into the dispersion and stirred, the stirring rate was 600r / min, and the reaction time was 4h, the obtained mixture was washed and separated, and the separated modified calcium carbonate was placed in a bl...
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