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Ultralow-temperature resistant calcium-based solid-free drilling fluid for drilling in tundra or severe cold region

A drilling fluid and ultra-low temperature technology, used in drilling compositions, chemical instruments and methods, can solve the problems of environmental pollution and high cost, and achieve the effects of good rheological properties and strong low temperature resistance.

Inactive Publication Date: 2014-06-04
BEIJING INST OF EXPLORATION ENG +1
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  • Claims
  • Application Information

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Problems solved by technology

At present, most low-temperature drilling fluids use hydrocarbon-based fluids with various additives (TC21 aviation fuel, diesel fuel, etc.), ethanol aqueous solution, ethylene glycol aqueous solution, etc., but this type of drilling fluid is harmful to the environment. Pollution and high cost

Method used

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  • Ultralow-temperature resistant calcium-based solid-free drilling fluid for drilling in tundra or severe cold region

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with specific examples, so that those skilled in the art can better understand and implement it, but the given examples are not intended to limit this patent.

[0023] The preparation method of the ultra-low temperature resistant calcium-based solid-phase-free drilling fluid provided by the present invention is as follows: take 10-30 parts of calcium chloride, 0.1-0.5 parts of partially hydrolyzed polyacrylamide, 0.1-0.5 parts of viscosifier, fluid loss reducer 1~5 parts of lubricant, 1~5 parts of lubricant and 1~3 parts of defoamer are dissolved in 100 parts of water in turn, and fully stirred evenly.

[0024] Among them, calcium chloride is used to lower the freezing point of drilling fluid. Any commercially available calcium chloride can be used, such as: calcium chloride produced by Jinhui Taiya (Beijing) Chemical Reagent Co., Ltd., and calcium chloride produced by Tianjin Xin Dayu Chemical Co., Lt...

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Abstract

The invention relates to a low-temperature resistant solid-free drilling fluid suitable for an ultralow-temperature environment, which consists of 100 parts of water, 10-30 parts of calcium chloride, 0.1-0.5 part of partially hydrolyzed polyacrylamide, 0.1-0.5 part of tackifier, 1-5 parts of fluid loss agent, 1-5 parts of lubricant and 1-3 parts of antifoaming agent. The drilling fluid provided by the invention has relatively strong low-temperature resistance and good rheological property, is suitable for the drilling work in low-temperature condition, and can provide technical support to the drilling construction in the ultralow-temperature tundra and severe cold regions in winter in China.

Description

technical field [0001] The invention relates to an ultra-low temperature resistant drilling fluid for drilling in permafrost layers and winter severe cold areas and a preparation method thereof. Background technique [0002] Drilling construction units in Xinjiang, Qinghai, Tibet, Heilongjiang and other places will conduct drilling construction in permafrost and ultra-low temperature environments in winter severe cold areas. When drilling in such a low-temperature environment, since the temperature in the borehole and the environment can reach or even exceed -30°C (ultra-low temperature), it often happens that the drilling fluid freezes when the temperature drops below the freezing point, resulting in the failure of the drilling fluid to circulate. Frozen in the hole and unable to continue construction. Therefore, it is urgent to study a low-temperature-resistant drilling fluid suitable for use under ultra-low temperature conditions. How to maintain good rheology of drill...

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Application Information

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IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/34
Inventor 陶士先付帆熊正强彭步涛纪卫军潘小志陈金照罗冠平
Owner BEIJING INST OF EXPLORATION ENG