Method for layering, stage multi-level blasting, hole expanding and crack expanding of oil-gas-bearing rock

Abstract

The invention relates to a method for layering, stage multi-level blasting, hole expanding and crack expanding of an oil-gas-bearing rock. A drilling machine drills a vertical hole to the oil-gas-bearing rock, multilayer horizontal build-up is conducted in the oil-gas-bearing rock, and a casing pipe is contacted and fixed with an outer shale body and extends into a curve section; a light pipe is contacted and fixed with the outer shale body in a horizontal section, a packer is used for sealing the staggered position of the light pipe and the casing pipe, the light pipe with the preset length is arranged inside the horizontal section, and except the light pipe section, the residual horizontal section is an uncased hole; and a hydraulic expansion device is used for sending explosives to different positions of the horizontal uncased hole section, the explosive quantities increase gradually at the same position, stage blasting hole expanding and high-pressure gas explosion cracking at the position of the uncased hole are completed, and backwashing is conducted for different-stage blasting broken rocks to clear the uncased hole. Step-by-step blasting is conducted in a direction from the remote end of the uncased hole to the light pipe during blasting cracking, different levels of explosive quantities are adopted, the quantity at the remote end of the uncased hole is the most and the quantities are reduced gradually towards the curve section, so that the light pipe is protected, the backwashing of blasting broken rocks is facilitated, and big hole collapse and cracking are achieved.

Description

technical field [0001] The invention relates to the technical field of explosive hole expansion and fracturing of horizontal wells in oil-gas rocks, in particular to a layered and segmented multi-stage blasting method for hole expansion and cracking of oil-gas rocks. Background technique [0002] Hydraulic fracturing technology is one of the most widely and effective stimulation methods used in oil and gas field engineering development. Hydraulic fracturing is to inject high-pressure water into oil and gas reservoirs. The high-pressure water pressure causes the development of cracks in the oil and gas reservoirs, increases and expands the oil and gas permeation channels, and achieves the goal of increasing the production of oil and gas reservoirs. [0003] The practice of hydraulic fracturing in the development of oil and gas reservoirs has proved that hydraulic fracturing can increase oil and gas production to a certain extent, but the duration of hydraulic fracturing is sh...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of high injection and low output in the development of oil and gas rocks, and provide a simple process, convenient operation, safety, suitable for field operations, which can effectively expand the pores and fractures of shale reservoirs and effectively A layered, segmented and multi-stage blasting method for hole expansion and crack increase that is beneficial to the continuous exploitation of shale gas

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