Test system for simulating underground organic rock in-situ pyrolysis oil gas extraction and working method

Abstract

The invention discloses a test system for simulating underground organic rock in-situ pyrolysis oil gas extraction and a working method, the test system comprises a confining pressure cylinder, the confining pressure cylinder is internally provided with a clamping cylinder for clamping an organic rock sample, the side wall of the confining pressure cylinder is provided with a liquid injection port communicated with an annular channel, and the side wall of the confining pressure cylinder is also provided with a heater; a pressure-bearing block abutting against the lower end of the upper cover plate and the upper end of the organic rock sample is arranged in the first connecting piece in a sealed mode, and an electric heating rod penetrating through the pressure-bearing block and the upper cover plate, an inert gas input pipe and a pyrolysis gas output pipe are arranged in the organic rock sample; a pressurizing pressing block is hermetically arranged in the second connecting piece, the lower end of the pressurizing pressing block is connected with a pressurizing device penetrating through the lower cover plate, and a seepage product output pipe penetrating through the pressurizing pressing block is arranged in the organic rock sample. The device can effectively overcome the defect that a sample is easily stressed unevenly due to rigid constraint, is high in heating efficiency, and considers the influence of seepage evolution on pyrolysis gas transportation in the pyrolysis process.

Description

technical field [0001] The invention belongs to the technical field of in-situ pyrolysis and utilization of underground deep rock mass, and in particular relates to a test system and a working method for simulating in-situ pyrolysis of underground organic rock to extract oil and gas. Background technique [0002] Over the years, many researchers have actively sought alternative routes to produce fuel oil, and coal liquefaction to oil is considered to be an effective way to alleviate the oil crisis. However, the ground dry distillation coal-to-oil technology is prone to waste of resources during the mining and conversion process. A large amount of gas pollutants, organic compounds and particulate pollutants are emitted during the traditional coal-to-oil process, causing serious environmental pollution. At the same time, coal mining accidents and casualties occurred frequently. Under the increasingly tense situation of petroleum energy, it is of great significance to develop...

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the present invention provides a test system and working method for simulating in-situ pyrolysis of underground organic rocks to extract oil and gas, which can effectively overcome the shortcomings of rigid constraints that easily cause uneven force on the sample, and have high heating efficiency. Considering the influence of seepage evolution on pyrolysis gas transport during the pyrolysis process, it is convenient to study the law and mechanism of in-situ pyrolysis of underground organic rocks to extract oil and gas under the multi-coupling conditions of temperature, stress, seepage and concentration fields

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