Environment-friendly low solid phase oil-base drilling and completion fluids and preparation methods
An oil-based drilling fluid, low-solids technology, applied in the directions of chemical instruments and methods, drilling compositions, etc., can solve the serious problem of barite settlement in the completion fluid, troublesome drilling and completion operations, and blockage of oil layers. channel and other problems, to achieve the effect of good oil layer protection, increase drilling speed, and improve the effect of oil layer protection
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Embodiment 1
[0027] a. Take 55 liters of 5# white oil, add 6.0 liters of ZR-10 and FR-10 oxidized fatty acid surfactant mixture, 1.0 liter of oil-soluble polymer, 4.0 liters of wetting agent, 3 liters of alkalinity regulator, Water bath at 60°C, stirring at a speed of 11×1000rpm for 1h;
[0028] b. Slowly add 45 liters of potassium formate aqueous solution with a weight concentration of 2% to the solution in step a, place in a water bath at 60° C., and stir for 3 hours at a speed of 11×1000 rpm to obtain the product. The density is 0.95g / cm 3 The apparent viscosity of the system is 61mpa.s, the dynamic shear force is 10Pa, the initial and final shear is 5 / 7, the API water loss is less than 3ml, and the electrical stability is higher than 400V. The drilling fluid is stable for more than 24 hours.
Embodiment 2
[0030] a. Get 90 liters of 5# white oil, add 3.0 liters of ZR-10 and FR-10 oxidized fatty acid surfactant mixture, 3.0 liters of oil-soluble polymers, 1.0 liters of wetting agent, 9 liters of alkalinity regulator, Water bath at 40°C, stirring at a speed of 11×1000rpm for 2h;
[0031] b. Slowly add 10 liters of saturated potassium formate aqueous solution to the liquid in step a, place in a water bath at 40° C., and stir for 5 hours at a speed of 11×1000 rpm to obtain the product. Barite weighted to a density of 1.60g / cm 3 , the apparent viscosity of the system is 105mpa.s, the dynamic shear force is 16Pa, the initial and final shear is 5 / 7, the API water loss is less than 3ml, and the electrical stability is higher than 400V. Drilling fluid is stable for more than 30 hours. Compared with the 5# white oil cement-in-oil slurry with the same volume, oil-water ratio and density, the solid phase content is reduced by 32g, 7.5% of the added amount.
Embodiment 3
[0033] a. Get 70 liters of 5# white oil, add 4.5 liters of ZR-10 and FR-10 oxidized fatty acid surfactant mixture, 2.0 liters of oil-soluble high molecular polymer, 2.5 liters of wetting agent, 6 liters of alkalinity regulator, Water bath at 50°C, stirring at a speed of 11×1000rpm for 1.5h;
[0034] b. Slowly add 40 liters of potassium formate aqueous solution with a weight concentration of 10% to the liquid in step a, put in a water bath at 50° C., and stir for 4.5 hours at a speed of 11×1000 rpm to obtain the product. The density is 0.90g / cm 3 , the apparent viscosity of the system is 33mpa.s, the dynamic shear force is 6Pa, the initial and final shear is 1 / 2, and the API water loss is less than or equal to 3ml. Electrical stability is higher than 400V. The drilling fluid is stable for more than 24 hours.
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