Perforation construction method for volume fracturing of normal-pressure shale reservoir horizontal well

Abstract

The invention discloses a perforation construction method for volume fracturing of a normal-pressure shale reservoir horizontal well. The perforation construction method comprises the following stepsthat on the basis of fixed-plane perforation, the mounting angles of perforating bullets are adjusted, multiple perforating bullets on the same fixed plane of two wings of a horizontal shaft are symmetrically ejected in the direction perpendicular to the axis of the shaft, and the first perforating bullets on the adjacent fixed planes are distributed in the clockwise direction. According to the perforation construction method, the extension and the expansion of a fracturing crack are controlled favorably, the crack close to the shaft is promoted to form a fracture network, the flow conductivity of the crack is enhanced, a reservoir communicates with the shaft, and the volume fracturing effect of the shale reservoir can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of shale gas development and production increase, and specifically designs a perforation method in volume fracturing of horizontal wells in normal-pressure shale reservoirs. Background technique [0002] Shale reservoirs have the characteristics of low porosity and low permeability, and must undergo fracturing to obtain high production. At present, horizontal well staged hydraulic fracturing technology is mostly used for volume fracturing of shale reservoirs. As a key link in the hydraulic fracturing process, perforation can not only connect the reservoir and the wellbore, but also control the extension and expansion of fractures, promote the formation of complex fractures and fracture networks, and effectively complete reservoir volume stimulation. [0003] At present, the widely used perforation methods include spiral perforation, directional perforation and fixed surface perforation. These perforation m...

AI Technical Summary

Problems solved by technology

These perforation methods can reduce fracture initiation pressure to a certain extent and form complex near-wellbore fractures, but each has certain limitations.

The fractures formed by helical perforation expand randomly, and the connectivity between them is poor, so it is difficult to form a fracture network; the penetration depth of directional perforation fluctuates, and the fractures formed around the hole and the fractures near the wellbore mostly extend parallel to the axis of the wellbore, so it is difficult to form a transverse fracture. Fractures: The connections between different fracture surfaces formed by fixed-plane perforation are relatively random, and it is difficult to control the extension and expansion of main fractures

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