Pressure crack network design and completion method for enhanced geothermal system

Abstract

The invention relates to the field of geothermal development, and provides a pressure crack network design and completion method for an enhanced geothermal system. The method comprises the steps thatthe upper portion of an igneous rock type hot dry rock is reached through drilling, a horizontal well section is drilled by using a guiding well drilling technology, multi-stage segmented hydraulic fracturing is utilized, a horizontal crack network is produced by utilizing layer-shaped brittle components in an igneous rock body, two horizontal branch wells located on the same horizontal plane witha water injecting well section are drilled at the end of the horizontal well section of a water injection well, the rear end of a crack of the horizontal well section of the water injection well after fracturing is conducted is penetrated to complete docking, a horizontal crack network passage with high seepage is constructed, fluid can enter in a well tube along the crack on which fracturing isconducted, and energy utilization can be conducted after the fluid is exploited to the ground surface. By adopting a branch well, a micro vibration detection and processing system and a hydraulic fracturing technology, a hot dry rock storage layer is effectively recognized, the storage layer is opened to the maximum extent, geothermal energy of the hot dry rock storage layer is fully utilized, andthe exploiting efficiency of the geothermal energy is significantly improved.

Description

technical field [0001] The invention relates to the field of geothermal energy development, in particular to an enhanced geothermal system fracturing fracture network design and well completion method. Background technique [0002] Resources and the environment are the basic conditions for the survival, reproduction and development of human beings, and resources, environment and sustainable development have become major issues facing all human beings. Compared with the environmental pollution caused by non-renewable fossil resources such as coal, oil, and natural gas, geothermal resources, as a clean, low-carbon, safe, and efficient renewable energy, have attracted more attention in today's resource shortage. In February 2017, the National Development and Reform Commission, the National Energy Administration and the Ministry of Land and Resources jointly issued the "Thirteenth Five-Year Plan for the Development and Utilization of Geothermal Energy". It shows that the effici...

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Problems solved by technology

[0006] Based on the above analysis, the present invention designs an enhanced geothermal system fracturing fracture network design and well completion method, which solves the problem of hot dry rock exploitation. The well type design of the water well and the water production well, and then the water injection well and the water production well are efficiently connected through the fracturing fracture network design. The water of the water injection well flows to the water production well through the fracturing network. Through the production of water wells, multi-stage hydraulic fracturing effectively develops geothermal energy, solves the problem of low feasibility and low efficiency in the development of hot dry rock geothermal energy, and provides reliable technical support for the efficient development and utilization of dry hot rock

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