Earthquake-controlled fracturing artificial heat reservoir construction method for geothermal development of dry-hot granite

Abstract

The invention discloses an earthquake-controlled fracturing artificial heat reservoir construction method for geothermal development of a dry-hot granite. The earthquake-controlled fracturing artificial heat reservoir construction method comprises the steps that three-dimensional earthquake exploration is carried out in a dry-hot granite development favorable area, a target spot is developed in a fault non-development area, and a vertical well is drilled to a target layer. Imaging logging is carried out on the vertical well, a development layer section is selected as a fracturing section, and well completion is carried out through a combined pipe column. A small-liquid-volume reservoir fracturing test is carried out, energy waves generated along with a rock fracture event are monitored through a microearthquake means, and the accurate position of the rock fracture event and a'sand beach ball 'are obtained through moment tensor inversion. Whether an undetected large-size high-dip-angle natural structural surface exists in the fracturing section of the deep part of a reservoir or not is judged, and if yes, quartz sand is filled for plugging, and the holeless casing in a compact layer section is perforated. In cooperation with a fracturing material, hydraulic fracturing is carried out through a multi-liquid fracturing fluid. According to the earthquake-controlled fracturing artificial heat reservoir construction method for geothermal development of the dry-hot granite, a fracture network of the required scale can be formed in the dry-hot granite reservoir through hydraulic fracturing, and the risk of inducing an induced earthquake can be greatly reduced.

Description

Technical field [0001] The present invention relates to a dry heat storage construction method for dry hot granite, especially for a controlling method for controlling pressure cracking in dry heat granite geothermal development. Background technique [0002] As a large reserves of clean energy, dry heated rock type is gradually affecting the world energy pattern, and has become the focus of academic, government and corporate attention. For China, my country has proposed "CO2 emissions to achieve peaks in 2030 years ago, strive to achieve carbon neutralization" 2060 years ago. In order to achieve this goal, my country urgently needs to build clean, low carbon, efficient and multi-educational system. [0003] In 2017, my country has got a high-quality dry hot granite in the top of the Yellow River in the middle of the Yellow River. This marks the development of China's dry hot granite to enter the "fast lane", and safe and efficiently develops dry hot granite for my country's Yell...

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Problems solved by technology

For another example, the Chinese invention patent application with the application number 201610667760.7 discloses a method for early warning and prediction of microseisms in hot dry granite caused by hydraulic fracturing. Previously, the earthquake magnitude could be estimated, but this method only involved the early warning of earthquakes induced by fracturing of dry hot granite, and did not design how to reduce the earthquake risk

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