Drilling and blowout prevention sampling device for pneumatic down-hole hammer of geothermal wells

Abstract

The invention relates to the technical field of geothermal resource exploration, and discloses a drilling and blowout prevention sampling device for pneumatic down-hole hammer of geothermal wells. Thedrilling and blowout prevention sampling device for the pneumatic down-hole hammer of the geothermal wells comprises a blowout prevention sampling device outer shell partially sleeved on the periphery of an end part exposed on the ground of a drill rod, wherein a buffer cavity, a diversion cavity, a pressure relief shunt cavity and a sample collection and release cavity are sequentially formed inside the blowout prevention sampling device from left to right; the inlet end of the diversion cavity is communicated with the outlet end of the buffer cavity, the inlet end of the pressure relief shunt cavity is communicated with the outlet end of the diversion cavity, and the inlet end of the sample collection and release cavity is communicated with the outlet end of the pressure relief shunt cavity; a drain opening is formed in the bottom wall of the pressure relief shunt cavity, an air outlet is formed in the top wall of the sample collection and release cavity, and a sample collection opening is formed in the bottom wall of the sample collection and release cavity. The drilling and blowout prevention sampling device for the pneumatic down-hole hammer of the geothermal wells has the advantages of reducing the auxiliary time caused by blowout prevention and increasing the effective sampling rate of rock debris samples.

Description

technical field [0001] The invention relates to the technical field of geothermal resource exploration, in particular to a blowout prevention sampler for geothermal well drilling with a pneumatic down-the-hole hammer. Background technique [0002] As the market pays more and more attention to the exploration, development and utilization of geothermal resources, efficient exploration and development of geothermal wells has become one of the key points to rapidly promote the development of geothermal energy applications. In the process of developing geothermal wells, DTH hammers are usually used to drill However, when the DTH hammer is used for construction, due to its own drilling characteristics, the loss rate caused by drilling cuttings samples, and the auxiliary time caused by blowout prevention during the drilling process, the submersible The efficiency of the hole hammer drilling process, meanwhile, also increases the cost of the drilling process. Contents of the inven...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a geothermal well pneumatic down-the-hole hammer drilling blowout prevention sampler to solve the problem of prolonging the auxiliary time of blowout prevention and reducing cuttings during the construction of down-the-hole hammer drilling in the prior art. Technical issues with sampling rate of samples

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