Method for mining shale oil by virtue of horizontal well through performing volume fracturing on reservoirs

Abstract

The invention provides a method for mining shale oil by virtue of a horizontal well through performing volume fracturing on reservoirs. The method comprises steps as follows: Step 1, the fractal dimension D and the tortuous fractal dimension delta of a fracture network after volume fracturing of a reservoir are obtained through a box testing method; Step 2, a horizontal well in a test area is perforated and fractured, perforations and fractures which are perpendicular to a shaft are produced for the horizontal well, and shale oil mining is performed on the test area; Step 3, the yield of the test area under the combined action of multiple fractures of the fractured horizontal well in the test area is determined; Step 4, the effective permeability kn of the fractures and the equivalent permeability ke of matrix-fractures are determined. The method is simple and reliable in application process, the capacity of volume-fractured horizontal wells under different reservoir conditions can be predicted, only measuring parameters are required to be adjusted, the use reliability of the method is high, and the effect is good.

Description

technical field [0001] The invention relates to the technical field of oilfield development, in particular to a method for exploiting shale oil by volume fracturing horizontal wells. Background technique [0002] In recent years, with the development of petroleum technology, the development of unconventional resources has attracted people's attention. Especially after the successful exploitation of shale gas in the United States, it has had a huge impact on the development of shale reservoirs, which has attracted widespread attention worldwide and has become An important source of oil and gas supply. [0003] Shale oil reservoirs are ultra-low permeability tight reservoirs with poor physical properties and generally have no natural productivity or low yield. Economic exploitation mainly adopts the method of volume fracturing to transform reservoirs to obtain commercial production. At present, my country still lacks effective exploitation of shale oil. methods, especially the...

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Problems solved by technology

[0003] Shale oil reservoirs are ultra-low permeability tight reservoirs with poor physical properties and generally have no natural productivity or low yield. Economic exploitation mainly adopts the method of volume fracturing to transform reservoirs to obtain commercial production. At present, my country still lacks effective exploitation of shale oil. methods, especially the unknown of production prediction of fractured horizontal wells, directly restricts the efficient and reasonable development of shale oil

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