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

A water-based drilling fluid and environmental protection technology, applied in the field of drilling, can solve the problems of complex drilling fluid formula, difficult post-processing, difficult biodegradation, etc., and achieve the effect of ultra-low processing cost, outstanding economic benefits, and simple components

Active Publication Date: 2017-05-17
BC P INC CHINA NAT PETROLEUM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] This example provides an environmentally friendly water-based drilling fluid without aggravation, which contains: 400g of fresh water, 12g of Huaian bentonite, 0.24g of sodium carbonate, 6g of environmentally friendly fluid loss reducer ZJSJ, 2g of fluid loss reducer B, low viscosity Carboxymethyl cellulose LV-CMC 0.8g, oligomeric alcohol amine ZJ-1 8g, environment-friendly anti-high temperature lubricant ZJSR 6g and 1500 mesh calcium carbonate powder 8g.

[0026] Among them, fluid loss reducer B is a high temperature resistant modified bentonite-based fluid loss reducer, which is composed of bentonite, water, cetyltrimethylammonium bromide, acrylamide, 2-acrylamide-2-methyl Propanesulfonic acid is synthesized according to the weight ratio of 1.5:7:0.3:0.8:0.2. Specifically, the high-temperature-resistant modified bentonite-based fluid loss control agent is synthesized through the following steps: Weigh 1.5 parts by weight of sodium-based bentonite and 7 parts by weight...

Embodiment 2

[0032] This embodiment provides a density of 1.2g / cm 3 Environmentally friendly water-based drilling fluid, which contains: 400g fresh water, 16g Huaian bentonite, 0.32g sodium carbonate, 6g environmentally friendly fluid loss reducer ZJSJ, 3g fluid loss reducer B, low viscosity carboxymethyl cellulose LV-CMC 1.2 g. 10g of oligomeric alcohol amine ZJ-1, 8g of environment-friendly anti-high temperature lubricant ZJSR, 3g of 40nm silicon dioxide, 5g of 1500 mesh calcium carbonate powder and 115g of barite powder.

[0033] Wherein, the fluid loss control agent B is a high temperature resistant modified bentonite based fluid loss control agent, which is the same as the fluid loss control agent B in Example 1.

[0034] The environmentally friendly water-based drilling fluid is prepared through the following steps:

[0035] (1) Add Huaian bentonite and a part of sodium carbonate into fresh water, stir for 20 minutes, and then pre-hydrate for 24 hours;

[0036] (2) Under the high-s...

Embodiment 3

[0040] This embodiment provides a density of 1.6g / cm 3 Environmental protection water-based drilling fluid, which contains: fresh water 400g, Huaian bentonite 16g, sodium carbonate 0.32g, environment-friendly fluid loss additive ZJSJ 8g, fluid loss additive B 2g, low viscosity carboxymethyl cellulose LV-CMC 1.8 g, oligomeric alcohol amine ZJ-1 10g, environment-friendly anti-high temperature lubricant ZJSR 12g, 1000 mesh calcium carbonate powder 4g, 2000 mesh calcium carbonate powder 8g and barite powder 425g.

[0041] Wherein, the fluid loss control agent B is a high temperature resistant modified bentonite based fluid loss control agent, which is the same as the fluid loss control agent B in Example 1.

[0042] The preparation steps of the environment-friendly water-based drilling fluid are the same as in Example 2.

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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...

Claims

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Application Information

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IPC IPC(8): C09K8/20C09K8/24
Inventor 闫丽丽王立辉王发云王建华孙明昊高珊吴鑫磊
Owner BC P INC CHINA NAT PETROLEUM CORP
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