Low-solid-content drilling fluid used for hydrocarbon bearing shaly sands and preparation method of low-solid-content drilling fluid
A argillaceous sandstone, low solid phase technology, applied in the field of low solid phase drilling fluid and its preparation, can solve the problems of poor quality shale that cannot be precipitated, rapid increase in drilling fluid density, difficult solid phase control, etc., and achieves anti-drill cuttings pollution The effect of strong capacity, small reservoir damage and low filtration loss
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[0016] Examples:
[0017]
[0018] The drilling fluid is made of the above-mentioned ratio of compounds under normal temperature and pressure according to the following procedures:
[0019] (1) Use soda ash to remove Ca in the slurry water 2+ (Every time 1mg / l Ca is removed 2+ , Need to use soda ash 4.29g / m 3 );
[0020] (2) Take the slurry water, add the sodium bentonite and modified asbestos in the above ratio, stir it evenly with a stirrer, and let it stand for 24 hours to form a base slurry;
[0021] (3) Add the weighting agent in the above proportion to make the drilling fluid density meet the requirements;
[0022] (4) Sequentially add sulfonated pitch, sodium carboxymethyl cellulose, carboxymethyl starch ether, potassium polyacrylamide, and glycidyl trimethyl ammonium chloride in the above proportions, and stir to make it fully dissolved;
[0023] (5) Add alkalinity control agent to adjust pH to 8.5~9.5.
[0024] The drilling fluid prepared according to the above ratio and method h...
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