Well completion method for reinforcing hydrothermal type geothermal system

Abstract

The invention relates to the field of geothermal exploitation and provides a well completion method for reinforcing a hydrothermal type geothermal system. According to the method, a geothermal reservoir stratum is drilled through firstly, a microseism technology is utilized to conduct stratum microresistivity scanning imaging and dip angle combination logging, the stratum crack growing direction is recognized, then a branch hole is dilled in the perpendicular direction of crack growing, a hydraulic fracturing technology is adopted for fracturing a branch well section, thus a high-permeability geothermal reservoir stratum is constructed so as to enable a stratum fluid to enter a well drum along a fractured crack, the fluid is exploited to the ground through the well drum, and then power generation is conducted. According to the method, a branch well, microseism detection, a treatment system and the hydraulic fracturing technology are sufficiently utilized, the geothermal reservoir stratum crack is effectively recognized, the reservoir stratum is opened at a largest limitation, geothermal energy of the geothermal reservoir stratum is sufficiently utilized, and hydrothermal type geothermal energy exploitation efficiency is greatly improved.

Description

technical field [0001] The invention relates to the field of geothermal energy development, in particular to an enhanced hydrothermal geothermal system completion method. Background technique [0002] In the 1970s, after the global oil crisis broke out, scientists proposed the idea of ​​using geothermal energy in deep high-temperature rock mass to generate electricity. Geothermal is one of the promising renewable energy sources. Compared with other new energy sources such as solar energy, wind energy and biomass energy, it has the advantages of wide distribution, little external influence (such as day and night, wind speed, temperature difference), low carbon emissions and maintenance costs. Features. Geothermal resources are a kind of sustainable clean energy formed by the huge heat energy released by the thermonuclear reaction of radioactive substances inside the earth's core, which transfers heat to the shallow part of the earth's crust through carriers such as rock form...

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Problems solved by technology

[0005] Nowadays, there are few specific methods for the development of geothermal resources, and the actual operation is very difficult: (1) The self-circulation method of volume fracturing, although theoretically can achieve high heat transfer efficiency, it is difficult to grasp and control the docking of fractures (2) The gravity self-circulation method is difficult to control the flow direction of the heat-carrying fluid. Although the circular wellbore structure increases the heat transfer time of the fluid in the reservoir, it is difficult to succeed under the existing drilling technology

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