Dual-cluster hydraulic jet tubular column and dual-cluster hydraulic jet annulus fracturing method

Abstract

The invention provides a dual-cluster hydraulic jet tubular column and a dual-cluster hydraulic jet annulus fracturing method. As a CTY-211 packer is provided with a check valve device, the pressure in an oil pipe is increased by increasing the discharge capacity, so as to enable fluid in a sliding sleeve spray gun and a single-stage spray gun to form high-speed jet flow for perforation. After the perforation is finished, the tubular column is lifted by 1.5 meters and then put down until a pressure gauge indicates the pressure change of 8-10 tons, namely the packer is set, then the sliding sleeve spray gun is in a blockage state after a well mouth is closed and the tubular column is lifted, and sand fluid is simultaneously injected into an oil sleeve annulus and the oil pipe for carrying out fracturing. The sand fluid in the oil pipe carries out fracturing only through the lower single-stage spray gun and can prevent sand plugging and reduce friction resistance, so that the service life of a spray nozzle is greatly improved. The oil sleeve annulus can carry out large-capacity fracturing, so the fracturing efficiency is improved, multilayer fracturing during once drill-down is realized, and the occurrence of hazards is reduced. After the fracturing is finished, the oil pipe and the oil sleeve annulus can be cleaned in a manner that fluid is injected into the oil pipe and flows out from the oil sleeve annulus.

Description

technical field [0001] The invention relates to the technical field of oil well fracturing operations, in particular to a double-cluster hydraulic jet string and a double-cluster hydraulic jet annular space fracturing method. Background technique [0002] In recent years, starting from the concept of "volume fracturing", double-cluster hydraulic jet fracturing of horizontal wells has been carried out. The micro-seismic zones formed by them complement and overlap each other, which can increase the drainage volume of oil wells and horizontal wells. The transformation effect has been further improved. With the increase in the number of layers and depth of hydraulic jet fracturing in oil wells and horizontal wells, affected by the setting performance of packers and the erosion resistance of jet tools, the current dual-cluster jet tools cannot be fully utilized, resulting in Frequent tripping and tripping of pipe strings and replacement of drilling tools increase the auxiliary t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a dual-cluster hydraulic jet string and a double-cluster hydraulic jet annular space fracturing method, which overcomes the frequent tripping of strings, replacement of drilling tools, and construction of double-cluster fracturing of oil wells and horizontal wells The auxiliary time is long, the risk in the process of tripping and unloading the string is large, and the defects of environmental pollution

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