Drilling fluid and its preparation method
A drilling fluid and base fluid technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., to achieve the effect of simple preparation method, easy maintenance and adjustment of drilling fluid properties, and convenient on-site construction
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[0038] The preparation method of above-mentioned drilling fluid comprises:
[0039] a) Fully stir the water-based or oil-based base liquid;
[0040] b) adding polymer hollow microspheres to the mixed liquid obtained in step a) and stirring to obtain the drilling fluid of the present invention.
Embodiment 1
[0043] A low-density water-based drilling fluid prepared with polymer hollow microspheres
[0044] Weigh 400ml of pre-hydrated 3% sodium bentonite slurry, add 0.8g of potassium polyacrylate under stirring, stir at 10,000 rpm for 10 minutes at high speed, and then add 0.8g of low-viscosity sodium carboxymethylcellulose Salt, stir at high speed under 10000 rpm for 10 minutes, add 8g anti-slump agent after stirring evenly, stir at high speed at 10000 rpm for 5 minutes, add 8g sulfonated lignite resin after stirring evenly, and stir at high speed for 5 minutes at 10000 rpm, After stirring evenly, add 4g of ammonium salt, and the drilling fluid density measured according to the oil and gas standard SY / T5621-93 is 1.05g / cm 3 .
[0045] After the above water-based drilling fluid is prepared evenly, add 8g of it with a density of 0.25g / cm 3 The polymer hollow microbeads are stirred at a high speed of 10000 rpm for 10 minutes, and the polymer hollow microbeads low-density water-based...
Embodiment 2
[0047] A low-density oil-based drilling fluid formulated with polymer hollow microbeads
[0048]Measure 280ml of No. 5 white oil for drilling, add 8g of oil-based drilling fluid fluid loss reducer FB-MOTEX under load and stirring, stir at 12000 rpm for 10 minutes at high speed, stir well, then add 2g of oil-based drilling fluid For fluid loss agent HFR, stir at high speed at 12000 rpm for 10 minutes, stir well, then add 6g of oil-based drilling fluid fluid loss reducer FLB-6, stir at 12000 rpm at high speed for 10 minutes, stir well, then add 4g of lime, Stir at high speed at 12000 rpm for 10 minutes, stir evenly, then add 120ml of water with a calcium chloride concentration of 25%, and stir at high speed at 12000 rpm for 30 minutes to prepare water-in-oil emulsified drilling fluid. According to the oil and gas standard SY / T5621-93 Determination of the density of polymer hollow microbeads low-density oil-based drilling fluid, the measured density is 0.95g / cm 3 .
[0049] Af...
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