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Polar frozen earth cooling drilling device and method

A drilling device and frozen soil technology, applied in drilling equipment and methods, earthwork drilling, drill bits, etc., can solve problems such as thermal deterioration of rock samples, instability of well wall thawing, temperature rise, etc.

Pending Publication Date: 2019-12-31
CHINA UNIV OF MINING & TECH (BEIJING)
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems that when drilling in the polar permafrost, the heat generated by friction will increase the temperature in the drilling well, the well wall will be thawed and unstable, and the rock samples will deteriorate due to heat. Drilling device and method for polar frozen soil in low-temperature environment in drilling

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  • Polar frozen earth cooling drilling device and method
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  • Polar frozen earth cooling drilling device and method

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Embodiment Construction

[0018] The technical solution of the present invention will be further specifically described below in conjunction with the accompanying drawings.

[0019] see Figure 1-4 , a polar frozen soil cooling drilling device and method, mainly comprising a drilling sampler (7), a drilling power unit and a low-temperature foam drilling fluid circulation system. The drilling sampler (7) is a drilling part; the drilling power unit includes a hydraulic drilling chuck (5) and a locomotive unit (6), which provide drilling power and carrying equipment. The low-temperature foam drilling fluid circulation system includes a liquid inlet tank (1), a foamer (2), a cooling unit (3), a fluid delivery pipe (4), a wellhead sealing device (8), and a defoamer (9) , water pump (10), mud centrifugal box (11), mud centrifugal pump (12).

[0020] The drilling sampling process of the drilling device is as follows:

[0021] Add drilling fluid into the liquid inlet tank (1), the drilling fluid in the liqu...

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Abstract

The invention relates to a polar frozen earth cooling drilling device and method.The polar frozen earth cooling drilling device and method are provided tosolve the problemssuch as wellbore instabilityand deformation caused by the change of drilling temperature due to the friction and heat generation of a drill bit in polar environment.According to the polar frozen earth cooling drilling device and method, the function of maintaining low-temperature environment in well drilling is achieved through the circulation of low-temperature foam drilling fluid, the provided drilling device is providedwith an empty interlayer and a hole groove structure, the circulation of the low-temperature foam drilling fluid in a drilling sampler is achieved, the cooling effect is achieved, and contact with thewellbore is avoided. Compared with a conventional drilling device, the polar frozen earth cooling drilling device can maintain the stability of the wellbore and protect a rock sample in the polar frozen earth environment.

Description

technical field [0001] The invention relates to the field of polar frozen soil drilling, in particular to a polar frozen soil cooling drilling device and method. Background technique [0002] In the process of polar scientific investigation and other low-temperature environment geological research in China, geological condition investigation and drilling construction are important contents of the research work, which are of great significance to the study of geological evolution, natural resource development and environmental protection in harsh natural environments such as polar regions. [0003] Polar geological research is faced with the low temperature environment and permafrost problems, and the freezing and thawing phenomenon during drilling in permafrost has a great impact on drilling. When drilling in the permafrost region, the frictional heat in the well melts the permafrost, the soil particles lose their viscosity, and the well wall becomes unstable; when the drill...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B7/02E21B21/14E21B21/06E21B17/18E21B10/02E21B10/60
CPCE21B7/027E21B10/02E21B10/605E21B17/18E21B21/06E21B21/14
Inventor 杨晓峰聂爱国周家恒曲展慧杜宇飞简权
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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