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

Inactive Publication Date: 2013-07-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When drilling into the reservoir, the general heavy oil-based drilling fluid completion fluid contains high solid phase, which often blocks the oil layer channel, causes oil layer pollution, affects cr

Method used

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  • Environment-friendly low solid phase oil-base drilling and completion fluids and preparation methods

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention provides an environment-friendly low solid phase oil-base drilling and completion fluids and preparation methods. The oil-base drilling and completion fluids are composed of the following raw materials of, by volume, 55-90 parts of base oil, 1.0-3.0 parts of an oil-based thickener, 3.0-6.0 parts of an emulsifier, 1.0-4.0 parts of a wetting agent, 3-9 parts of an alkalinity regulator and 10-45 parts of saline water. The preparation methods is carried out according to the following steps of a. taking the base oil, adding the emulsifier, the oil-based thickener, the wetting agent and the alkalinity regulator in the base oil; water bathing at a temperature of 40-60 DEG C and stirring for 1-2 h at a speed of 11*1,000 rpm; and b. slowly adding 10-45 parts by volume of the saline water into a solution obtained from the step a and stirring for 3-5 h at a speed of 11*1,000 rpm to obtain products.

Description

technical field [0001] The invention relates to the technical field of petroleum drilling fluid or well completion fluid, in particular to an environment-friendly low-solid phase oil-based drilling fluid completion fluid and a preparation method thereof. Background technique [0002] With the continuous expansion of the field of oil drilling and the development of oilfields gradually entering the middle and later stages, the difficulty of drilling operations continues to increase. High-difficulty wells often encounter drilling engineering problems such as stuck pipe, wellbore instability, well lost circulation and formation damage. Liquid completion fluids put forward higher and more comprehensive technical requirements. [0003] Oil-based drilling fluid completion fluids (including water-in-oil emulsified drilling fluid completion fluids) have strong inhibitory properties, shear stability, strong temperature resistance, protection of oil and gas layers, good lubricity, low ...

Claims

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Application Information

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IPC IPC(8): C09K8/12
Inventor 何兴华钟春王宝田严波张海清王海锋周辉姜春丽刘学英郝泽君刁振涛
Owner CHINA PETROLEUM & CHEM CORP
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