Shale oil reservoir multistage crack diversion capacity optimization method

Abstract

The invention belongs to a shale oil reservoir fracture net fracturing optimization technology, and particularly relates to a shale oil reservoir multistage crack diversion capacity optimization method. The method comprises the following steps of S1, optimizing a complex crack modification body, obtaining the reservoir characteristic of a shale oil reservoir, and obtaining the volume and the permeability of the optimized modification body according to the oil-gas seepage mechanical theory; S2, determining the optimal equivalent crack permeability; S3, determining the equivalent crack diversioncapacity; and S4, calculating the optimal multistage crack diversion capacity. By utilizing the method, the three-stage crack diversion capacity of a main crack, a secondary crack and a micro-crack of a complex crack formed by the shale oil reservoir fracturing can be determined, so that guidance is provided for selection of fracturing propping agents and sand adding process design, the modification body with high-efficiency supporting is formed in a shale oil layer, and the modification effect of the shale oil reservoir is improved.

Description

technical field [0001] The invention belongs to the shale oil reservoir fracture network fracturing optimization technology, in particular to a shale oil reservoir multi-stage fracture conductivity optimization method. Background technique [0002] Encouraged by the successful exploration and development of shale oil in the United States, shale oil resources have gradually attracted global attention. my country is rich in shale oil resources and is an important replacement for my country's oil and gas resources. However, because shale reservoirs exist in shale, their permeability and porosity are extremely low, and large-scale hydraulic fracturing must be used to generate complex fracture networks for effective exploration and development. At present, proppant selection and sanding process design are based on experience in fracturing at home and abroad, and the understanding of how much conductivity is required for fractures at all levels formed by fracturing is not clear, a...

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Problems solved by technology

However, because shale oil reservoirs exist in shale, their permeability and porosity are extremely low, and large-scale hydraulic fracturing must be used to generate complex fracture networks for effective exploration and development.

At present, proppant selection and sanding process design are based on experience in fracturing at home and abroad, and the understanding of how much conductivity is required for fractures at all levels formed by fracturing is not clear, and there is no effective method to optimize the conductivity of complex fractures.

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