A fracturing stimulation method for high-inclination secondary well reservoirs

Abstract

The invention relates to a method for fracturing and reforming highly inclined secondary well reservoirs, and belongs to the technical field of petroleum exploration and development. The present invention firstly determines the type of fractures after fracturing according to the inclination angle and azimuth angle of the secondary well, and adopts mechanical partial pressure technology for fracturing reconstruction for target wells that can form independent fractures after fracturing. A multi-stage packer was used to pack the perforation section, with the goal of forming multiple independent parallel fractures; for the target wells that cannot form independent fractures after fracturing, the temporary plugging agent in the fracture is used for temporary plugging and fracturing. The temporary plugging agent is added to form multiple secondary fractures at the same time as the main fractures, increasing the complexity of artificial fractures. The present invention adopts different fracturing techniques for different fracture types after fracturing, adopts mechanical partial pressure technique for wells that can form independent fractures, and adopts temporary plugging fracturing technique for wells that cannot form independent fractures, so as to maximize reservoir stimulation Volume, improve the transformation effect.

Description

technical field [0001] The invention relates to a method for fracturing and reforming highly inclined secondary well reservoirs, and belongs to the technical field of petroleum exploration and development. Background technique [0002] Generally, the effective permeability of the reservoir is lower than 1×10 -3 μm 2 Reservoirs are defined as low-permeability reservoirs, and fracturing is the only way to effectively develop such reservoirs. The classic idea of ​​stimulation is to create a fracture as long as possible in the reservoir, and oil and gas in the reservoir on both sides of the fracture flow into the wellbore through this fracture. In contrast, low-permeability oilfields are generally developed using cluster well injection-production well patterns. As the lower limit of the physical properties of producing reservoirs continues to decrease, longer fractures are needed to communicate with the reservoir body, but the length of the fractures is limited by the injecti...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for fracturing stimulation of high-slope secondary well reservoirs to solve the problem of poor fracturing stimulation effect caused by the lack of refined fracturing for different fracture types in the current cluster well fracturing design. bad question

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