Mid-deep formation buried pipe horizontal well heat exchange structure and method

Abstract

The invention discloses a mid-deep formation buried pipe horizontal well heat exchange structure and method. The mid-deep formation buried pipe horizontal well heat exchange structure comprises a first opening vertical well arranged on a rock layer or a soil layer and a second opening well arranged at the center of the bottom of the first opening vertical well. The second opening well comprises avertical well section, an angle building section and a horizontal section which are connected in sequence, a surface layer sleeve is arranged on the inner side of the first opening well wall of the first opening vertical well, and first opening cementing cement fills between the first opening well wall and the surface layer sleeve. A buried pipe outer pipe is arranged on the inner sides of the surface layer sleeve and the second opening well wall of the second opening well, and second opening cementing cement fills between the inner sides of the buried pipe outer pipe, the surface layer sleeveand the second opening well wall of the second opening well. A buried pipe inner pipe is arranged in the buried pipe outer pipe, and the end, extending into the buried pipe outer pipe, of the buriedpipe inner pipe communicate with the buried pipe outer pipe. The position at which the buried pipe outer pipe communicates with the outside world is a heat exchange working medium inlet end, and the position at which the buried pipe inner pipe communicates with the outside world is a heat exchange working medium outlet end. The mid-deep formation buried pipe horizontal well heat exchange structureand the method can realize heat extraction without water extraction, and solve the problems of heat preservation and service life of a central pipe.

Description

technical field [0001] The invention relates to the field of development and utilization of geothermal energy, in particular to a heat exchange structure and method for a horizontal well with buried tubes in middle and deep layers. Background technique [0002] At present, there are two technologies for the development and utilization of mid-deep geothermal energy, mid-deep geothermal fluid utilization technology and mid-deep geothermal energy vertical well deep-buried pipe extraction technology. Since both technologies have certain shortcomings, the details are as follows: [0003] Medium-deep geothermal fluid utilization technology: The utilization of this technology is restricted by the occurrence conditions of geothermal fluid, and the construction is difficult. In addition, there are problems such as severe corrosion of pipelines by geothermal fluid, tail water discharge is easy to pollute the environment, and geothermal fluid resources are not renewable. [0004] Mediu...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a heat exchange structure and method for horizontal wells with medium-deep underground pipes to solve the problems of the prior art. The present invention can realize heat extraction without water intake, and solve the problems of central pipe heat preservation and service life

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