Construction method for atmospheric pressure shale gas volume fracturing

Abstract

The invention discloses a construction method for atmospheric pressure shale gas volume fracturing, comprising the following steps: conducting directional perforating to form two rows of holes in theupper wing and the lower wing of a horizontal well shaft along the direction of the horizontal well shaft on the basis of plane perforation, and forming an orthogonal state with the plane perforation.According to the method disclosed by the invention, the reservoir transformation volume can be greatly increased, so that the problems that the post-fracturing effect cannot reach the expectation andthe stable yield cannot reach the economic exploitation value in the normal-pressure shale gas fracturing technology are solved. By the adoption of the method, the production potential of the reservoir is fully excavated, comprehensive popularization of the volume fracturing technology is facilitated, and great significance is achieved for improving the development technology level and economic benefits of an unconventional oil and gas reservoir.

Description

technical field [0001] The invention relates to the field of geological exploration, in particular to a construction method for volume fracturing of normal-pressure shale gas. Background technique [0002] After the production of oil wells reaches a certain stage, the production capacity and permeability decrease. In order to enhance the oil drainage capacity and increase the production of oil wells, people invented fracturing technology. There are two types of fracturing methods: hydraulic fracturing and high-energy gas fracturing. Hydraulic fracturing is to inject fluid into the well at high speed by the ground high-pressure pump truck unit, and use the high pressure at the bottom of the well to break the rock in the oil layer and produce cracks. In order to prevent the pressure from dropping after the pump truck stops working, the cracks will close up by themselves. The injected liquid after the formation rupture is mixed with sand which is several times denser than the f...

AI Technical Summary

Problems solved by technology

[0003] However, limited by the current technical conditions, in many practical application scenarios, although the fracturing construction has been successful, the post-fracturing effect has not been ideal, and the post-fracturing production is far below the economic mining value.

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