Ultra-low temperature resistant calcium-based low-solid drilling fluid for drilling in permafrost or severe cold areas

A drilling fluid and ultra-low temperature technology, applied in the direction of drilling compositions, chemical instruments and methods, etc., can solve the problems of high cost, poor formation adaptability, environmental pollution, etc., achieve strong adaptability, good rheology, and easy to carry The effect of cuttings

Inactive Publication Date: 2014-06-04
BEIJING INST OF EXPLORATION ENG +1
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Problems solved by technology

At present, most cryogenic drilling fluids use hydrocarbon-based liquids with various additives (TC21 aviation fuel, diesel fuel, etc.), ethanol aqueous solutions, ethylene glycol aqueous solutions and other solid-free drilling fluids. Not only does it pollute the environment, but it also costs a lot
In addition, the solid-free drilling fluid has relatively poor adaptability to the formation, and has certain limitations in use

Method used

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  • Ultra-low temperature resistant calcium-based low-solid drilling fluid for drilling in permafrost or severe cold areas

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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 low-solid phase drilling fluid provided by the present invention is: take 10-30 parts of calcium chloride, 1-10 parts of multi-functional compound agent, 0.5-2.0 parts of viscosity reducer, and fluid loss reducer in parts by weight. Add 0.1~1.0 parts, 1~5 parts of lubricant and 1~3 parts of defoamer to 100 parts of water, and stir well.

[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., Ltd.

[0025] Multifunctiona...

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Abstract

The invention relates to ultra-low temperature resistant calcium-based low-solid drilling fluid for drilling in permafrost or severe cold areas. The ultra-low temperature resistant calcium-based low-solid drilling fluid is composed of 100 parts of water, 10-30 parts of calcium chloride, 1-10 parts of multifunctional complexing agent, 0.5-2.0 parts of viscosity reducer, 0.1-1.0 parts of filtrate reducer, 1-5 parts of lubricant and 1-3 parts of antifoaming agent. The drilling fluid provided by the invention has good rheological property in an ultra-low temperature environment and quite good wall protection capability and carrying ability, thereby providing a technical support for drilling constructions in permafrost and severe cold areas in winter of our country.

Description

technical field [0001] The invention relates to a drilling fluid for drilling in permafrost regions or severe winter regions and a preparation method thereof. Background technique [0002] When drilling in Xinjiang, Qinghai, Tibet, Heilongjiang and other places, they often encounter permafrost and extremely cold and ultra-low temperature environments in winter. When drilling in such a low-temperature environment, because the temperature in the borehole and the environment reach or even exceed -30°C (ultra-low temperature), the drilling fluid often freezes, resulting in the failure of the drilling fluid to circulate, and the drilling tools are frozen in the hole and cannot be used. Continue construction. When the permafrost melts after overwintering, the drilling fluid may also experience formation instability due to the loss of cement and the ability to retain walls. Therefore, there is an urgent need to study a drilling fluid suitable for use under ultra-low temperature ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/12
CPCC09K8/12C09K2208/34
Inventor 陶士先付帆纪卫军彭步涛陈金照潘小志罗冠平熊正强
Owner BEIJING INST OF EXPLORATION ENG
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