Environment-friendly water-based drilling fluid and preparation method thereof

Abstract

The invention provides environment-friendly water-based drilling fluid and a preparation method thereof. The water-based drilling fluid is prepared from the following raw materials in parts by weight: 100 parts of water, 1-5 parts of bentonite, 0.05-0.4 part of sodium carbonate, 0.5-3 parts of a filtrate reducer A, 0.2-3 parts of a filtrate reducer B, 0.1-1 part of a viscosity / yield boosting agent, 0.5-4 parts of an inhibitor, 1-5 parts of a lubricant, 2-6 parts of a micro / nano particle plugging agent and 0-200 parts of weighting materials. The preparation method of the drilling fluid comprises the steps of adding bentonite and sodium carbonate into water; sequentially adding the filtrate reducer A, the filtrate reducer B, the viscosity / yield boosting agent, the inhibitor, the lubricant and the micro / nano particle plugging agent; adjusting the pH value by using sodium carbonate; selectively adding the weighting materials until the density reaches the drilling requirements. The resisting temperature of the drilling fluid can reach 150 DEG C, EC50 is greater than 3.0*10<4>mg / L, and the drilling fluid is nontoxic and environmentally friendly and has good rheological property, filtration reducing property, rejection capability, lubricating property, pollution resistance and reservoir protection effect.

Description

technical field [0001] The invention relates to the field of drilling technology, in particular to an environment-friendly water-based drilling fluid and a preparation method thereof, which can be used for the exploitation of oil and gas resources on land or in the ocean, and are also suitable for the exploitation of shale oil and gas resources. Background technique [0002] Drilling fluid ensures the safety, quality, speed and efficiency of drilling engineering. In recent years, as people's awareness of environmental protection has become stronger, the laws of various countries have also put forward strict requirements on the environmental protection of drilling fluid. However, a variety of drilling fluid systems widely used at present, such as polymer drilling fluid systems of acrylic acid and its derivatives series, polysulfide drilling fluid systems, and oil-based drilling fluid systems, have serious environmental pollution, difficult biodegradation, and difficult post-pr...

AI Technical Summary

Problems solved by technology

However, a variety of drilling fluid systems widely used at present, such as polymer drilling fluid systems of acrylic acid and its derivatives series, polysulfide drilling fluid systems, and oil-based drilling fluid systems, have serious environmental pollution, difficult biodegradation, and difficult post-processing. problems, and the treatment agents used are mainly artificially synthesized polymers and sulfonated treatment agent materials, some of which also contain heavy metal ions, which bury the hidden danger of polluting the environment from the source, which leads to drilling cleaning Contradiction Between Production and Drilling Engineering Needs

[0003] At present, the use of drilling fluid treatment agent materials with a high degree of pollution is not strictly controlled at the source in China, and the drilling fluid formula is complicated. A drilling fluid technology that can not only meet the drilling needs of different well depths but also meet the requirements of environmental protection has not yet been formed.

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