Method for optimizing flow capacity of fracturing and acidizing complex fractures in tight oil and gas reservoirs

Abstract

The invention aims to disclose a method for optimizing flow capacity of fracturing and acidizing complex fractures in tight oil and gas reservoirs. With the method, shortcomings in the prior art can be overcome, the reservoir boundary effect, stress sensitivity, heterogeneity of fracture conductivity and the influence of non-darcy flow in fractures are fully considered, fluid flowing in a fracturing and acidizing well firstly flows into secondary fractures and main fractures through matrixes, the physical process by which the fluid flowing into the secondary fractures passes through the main fractures to flow into the bottom of the well is achieved, a reasonable basis is provided for optimizing the fracture flow capacity of the fracturing and acidizing well by coupling flow relationship between the secondary fractures and the main fractures, and the reservoir reform effect is improved.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a method for optimizing the flow capacity of complex fractures in fracturing and acidizing tight oil and gas reservoirs. Background technique [0002] With the development of the oil and gas industry, the development of tight sandstone and carbonate reservoirs has gradually become the focus. Preliminary evaluation results show that the recoverable resources of tight oil in China are 13×10 8 ~14×10 8 t, the recoverable resources of tight gas are 8.8×10 12 ~12.1×10 12 m 3 , the recoverable resources of shale gas are 12.85×10 12 m 3 . Fracturing and acidizing stimulation is the core necessary technical means for the exploration and development of tight oil and gas reservoirs. Laying proppants through hydraulic fracturing or acid fracturing to form complex fractures in the reservoir to form high-speed flow channels for oil and gas is a key ...

AI Technical Summary

Problems solved by technology

[0003] At present, the optimization of the conductivity of fractures in tight oil and gas reservoirs is mainly based on the corresponding research on the matching of fluid transported by the matrix and the conductivity of fractures. Research on fracture conductivity optimization method for maximizing oil and gas production through fluid phase coupling between fractures and complex main fractures

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