Method for manually building oil shale underground broken bodies

Abstract

The invention provides a method for manually building oil shale underground broken bodies and relates to the technical field of oil shale underground in-situ transformation. The method comprises the following steps: drilling a horizontal well; after drilling the horizontal well, performing staged fracturing on the horizontal well by a hydraulic fracturing method; after fracturing, injecting a liquid explosive into the horizontal well, enabling the liquid explosive to enter a stratum fracture formed by staged fracturing, and further reinforcing the underground oil shale layer by using the energy generated by explosion to generate the broken body; enhancing the porosity and the permeability of the oil shale exploiting layer to form an underground in-situ transformation broken body; and drilling a plurality of vertical wells, wherein the oil shale layer between the horizontal well and the vertical wells generates sufficient heat transfer area at the moment. By the method, the cost is reduced, the rubblization of the oil shale layer can be improved, the effect is better as compared with that of the conventional fracturing method, the heat-conducting capability of the oil shale stratum can be improved obviously, development of an oil shale in-situ process is benefited, and conditions are provided for realizing commercial use of the oil shale.

Description

technical field [0001] The invention belongs to the field of artificially building underground broken bodies of oil shale, in particular to a method for artificially building underground broken bodies of oil shale. Background technique [0002] Oil shale resources are widely distributed, rich in reserves, and have considerable utilization value. Oil shale mining technology is mainly divided into surface carbonization technology and underground in-situ mining technology. Due to the disadvantages of surface carbonization technology, such as large investment and high pollution, underground in-situ mining technology has attracted more and more attention. However, the permeability of natural oil shale is extremely low, and the underground heating efficiency is low. Therefore, in the current oil shale development, large-scale hydraulic fracturing technology is mainly used to create artificial fractures. However, since oil shale resources are mostly distributed in the deep crust, a...

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Problems solved by technology

However, the permeability of natural oil shale is extremely low, and the underground heating efficiency is low. Therefore, in the current oil shale development, large-scale hydraulic fracturing technology is mainly used to create artificial fractures. However, since oil shale resources are mostly distributed in the deep crust, and the reservoir It is relatively thin, so the pressure requirements for fracturing are relatively high, and the current fracturing technology is difficult to meet the requirements of the in-situ transformation process. The fracture porosity and permeability produced by conventional hydraulic fracturing are small, and the hydraulic pressure cannot be accurately controlled. The extension direction of fractures produced by fracturing makes the result of fracturing very uncertain

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