Shale gas thermal recovery method and system by using deep geothermal resources

Abstract

The invention relates to shale gas thermal recovery technology by using deep geothermal resources, in particular to a shale gas thermal recovery method and system by using deep geothermal resources. The shale gas thermal recovery method includes the steps of well pattern arrangement, buried well drilling, installation of thermal recovery devices and thermal recovery of shale gas. The shale gas thermal recovery system comprises row-shaped well patterns located on two sides of a horizontal well, each row-shaped well pattern further comprises four buried wells in a same structure, and each buried well further comprises perforations formed in the pipe section of a casing located on the position of a shale gas reservoir layer and the pipe section of a casing located on the position of a hot dry rock layer; the perforations communicate inner cavities of the casings with the shale gas reservoir layer and the hot dry rock layer correspondingly; and gravity thermal pipes made of a working medium which can be gasified when being heated are internally mounted in the buried wells. The shale gas thermal recovery method and system by using the deep thermal resources have the advantages that the energy consumption is dramatically reduced, the desorption of absorption gas in the shale gas reservoir layer is promoted, the productivity is improved, and the recovery cost is reduced.

Description

technical field [0001] The invention relates to a technology for thermally recovering shale gas by using deep geothermal resources, in particular to a method and system for thermally recovering shale gas by utilizing deep geothermal resources, reducing energy consumption, promoting the desorption of adsorbed gas, improving recovery and reducing mining costs. Background technique [0002] Unconventional oil and gas resources are a new resource type, mainly including shale gas, shale oil, tight sandstone gas, coalbed methane, etc. Among them, shale gas is self-generated and self-storage, which is continuously accumulated in the micro-nano pores of shale. Shale gas is one of the earliest and most successful natural gas types explored and developed in the United States. According to the 2013 annual energy outlook report of the U.S. Energy Information Administration (EIA), domestic natural gas production in the United States is expected to increase from 23.0×1012 ft3 in 2011 to ...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing technical problems of thermal shale gas recovery methods and devices in the prior art are: the degree of recovery is low, hot fluid needs to be injected, the hot fluid needs external auxiliary heating, high energy consumption, and is limited by the reduction of formation pressure. A large part of the adsorbed gas cannot be desorbed, and the mining cost is high

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