Novel well bore structure and well completion method for geothermal well

Abstract

The invention aims to provide a well completion method to overcome existing technical defects. According to the well completion method, a casing string is put into a drilled borehole according to design standards, and cement is poured into the well wall annulus of a well so that the well bore design quality can be ensured. The well completion method mainly depends on the grading well cementation technique and the water stopping technology of a geothermal well, cement is poured into an annulus between a second-opening borehole water taking section and a casing through an outer casing packer, a classification hoop and other components, and the effect of permanent separation and water stopping is achieved. The invention further provides a novel well bore structure for the geothermal well. The well bore structure is a perpendicular drilling well structure. A surface casing, a well fixing section and a production casing are sequentially arranged from the ground to the well bottom. The surface casing is arranged from the ground to the well fixing section, and one section of the upper end of the well fixing section is wrapped with the surface casing in the circumferential direction. The well fixing section is composed of a wellhead well fixing section body and a well bore well fixing section body. The adopted structure has the following advantages that permanent water stopping of the geothermal well can be achieved, surface water can be protected permanently, heat losses of a production well can be reduced, and the heat preservation effect is achieved.

Description

technical field [0001] The invention relates to the field of geothermal well body technology, in particular to a novel well body structure and a well completion method of a geothermal well. Background technique [0002] As a renewable energy source, geothermal resources have been included in the "13th Five-Year Plan" energy plan. How to develop and utilize geothermal resources well is one of the strategies for the national energy industry layout. Effectively extracting the geothermal resources we need from the ground is the main research topic of geothermal workers. [0003] The research on the wellbore structure design and completion method of geothermal wells is an important link in the construction process of geothermal wells, and it is also a relatively independent systematic project that connects drilling and production. [0004] Geothermal well body structure design and completion method technology will directly affect the water temperature and water volume and use e...

AI Technical Summary

Problems solved by technology

[0006] The above two well-forming structures have their own disadvantages. The first type of two-opening structure is easy to form and low in cost. However, the method of using water stoppers is a temporary water stop after all, and it is difficult to ensure the quality of water stop

The second three-opening structure has better well completion efficiency, but high cost, long construction period and complex well completion

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