A geothermal well trajectory and design method based on horizontal docking of inclined wells

Abstract

The invention provides an inclined-well horizontal docking based type geothermal-well hole trajectory and a design method thereof. The method includes the steps of 1), according to the size and shape of a construction area, determining positions and coordinates of a wellhead A of an inclined well and a wellhead B of a horizontal engineering well, calculating the distance di between the wellhead A and the wellhead B according to the coordinates of the wellhead A and the wellhead B, and determining the backward migration distance d2 of the hole trajectory according to the distance d1; 2), determining the hole trajectory of the inclined well; 3), determining the hole trajectory of the horizontal engineering well. Backward migration is implemented on the S202 section of the hole trajectory formed in a second inclined well, and the backward migration distance d2 is generated, so that d1+d2 is greater than or equal to 250m; underground communicated docking distance is effectively increased, smooth operation of communication operation of the two wells is ensured, and conditions are created for developing mid-deep water thermal type geothermal resources in narrow sites of a city adopting the horizontal docking type geothermal well technology; the problem about 'taking both heat and water' by an existing hydrothermal type geothermal resource development mode is solved, and the purpose of 'taking water rather than heat' is truly realized.

Description

technical field [0001] The invention belongs to the technical field of geothermal energy development, and relates to a geothermal well track and a design method based on the horizontal docking of inclined wells. Background technique [0002] At present, there are three methods for the development of hydrothermal geothermal resources in the middle and deep layers in China: the first is to drill a vertical well, from which the underground hot water is directly extracted without recharging; the second is to drill a vertical well as a drainage well, and the surrounding drilling Multiple vertical wells are used as reinjection wells, and drainage and reinjection are combined; the third is to drill a vertical well, run concentric pipes into the well, and use the concentric pipes to perform cold and hot water circulation heat exchange. There are the following problems in these three development forms: ① all take the water-bearing heat reservoir (sandstone layer) as the target layer,...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a wellbore trajectory and design method based on inclined wells horizontally facing grounding thermal wells, which solves the problem of "extracting both heat and water" in the existing hydrothermal geothermal resource development mode, and truly realizes "only heat extraction" The purpose of "not fetching water"

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