Mud shale anti-fragmentation self-starting type refrigerated sampler and sampling method thereof

Abstract

The invention discloses a mud shale anti-fragmentation self-starting type refrigerated sampler and a sampling method thereof. The mud shale anti-fragmentation self-starting type refrigerated sampler is composed of a reducing joint, a diverting joint, a regulating single action mechanism, an outer tube, a drill core breakage-proof and cold source starting coring mechanism, a reamer, a drill core clamping and breaking mechanism, and a drill bit. The mud shale anti-fragmentation self-starting type refrigerated sampler and the sampling method thereof have the function of anti-fragmentation, and are particularly suitable for drill core sampling of easy-fragmented formations such as mud shales, oil shales, shale gas, natural gas hydrates and coal bed gas; when sampling is performed at differentrock layers and different depths, only different refrigeration amounts and valve pressure values are set according to need, the operation is simple, cold sources with various types can be applied, andthe range of application is wide; a hole bottom self-starting type freezing method is adopted to reduce the manual operation and improve the efficiency; and an alarm function is obtained after the completion of freezing, drill lifting and coring are carried out, a drill is lifted to the ground surface, the disassembling operation is simple, and subsequent analysis and testing are facilitated.

Description

technical field [0001] The invention relates to the field of frozen coring of friable formations, in particular to a shale anti-fragmentation self-starting freezing sampler and a sampling method thereof. Background technique [0002] The core is the complete first-hand information obtained in the process of oil and gas exploration and development. Only through a large number of analysis and research on the core can it provide a basis for formulating a reasonable development plan, accurately calculating oil and gas field reserves, and formulating production stimulation measures. To search for oil and gas in a sedimentary basin, it is necessary to sample and analyze various oil (gas) generation indicators from the core of the target layer. According to the test results, the target layer and favorable area for exploration oil and gas reservoirs can be selected from the perspective of oil (gas) generation. Through Through the analysis of the extracted core, we can further unders...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned problems such as the existing sampler core is easily broken, easy to pollute, the recovery rate is low, and the controllability of cold source startup is poor, and a kind of mud shale anti-fragmentation self-starting frozen sampler and its Sampling method

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