Gas propulsion seam-forming perforation process

Abstract

The invention relates to a gas propelled slot forming perforation process. The prior perforating gun body is adopted, and a bullet 89 or a bullet 102 or a bullet 127 is adopted. A sleeve type propellant grain is fixed and sleeved around the gun body which is conveyed to a downhole target stratum through an oil pipe or a cable. The bullet in the gun body is detonated through bar dropping or electrification. The detonated bullet produces strong metal flow which enters the stratum after passing through the side wall of the gun body and the sleeve type propellant grain. When the bullet passes through the sleeve type propellant grain, hot metallic particles produced by the bullet simultaneously ignites the sleeve type propellant grain around the gun body; the burning grain produces a great amount of high-temperature high-pressure gas which enters the stratum and flushes strongly the eyelets produced by the metal flow of the bullet again; thus, compressive fractures as well as a plurality of radial cracks are produced in the stratum. The process has the advantages of simple process, convenient operation, integral perforation and compressive fracture, good compressive fracture effect, good safety, high reliability and low cost. The process is suitable for being popularized in oil fields.

Description

technical field [0001] The invention relates to an oil well perforation completion process. At the same time of perforating, high-energy gas fracturing technology is used to improve the opening degree of the reservoir and improve the seepage capacity of the reservoir in the near-wellbore zone. It belongs to the field of petroleum exploration and development, and is a kind of completion technology for oil and gas wells; it can also be used for small-scale reservoir reconstruction, or as a pretreatment for large-scale reservoir reconstruction projects. Background technique [0002] After years of application in the oil field, it is recognized that there are still many deficiencies in conventional perforation. In order to adapt to various problems encountered in production, based on conventional perforation, a variety of supporting processes have been developed successively. Such as: open perforating through tubing, super positive pressure (nitrogen) perforating technology, mo...

AI Technical Summary

Problems solved by technology

[0004] 1. The perforation itself produces compaction, which reduces the porosity and permeability around the perforation channel;

[0005] 2. The pollution zone near the wellbore is thick, and the penetration depth of conventional perforation is not enough to penetrate the pollution zone near the wellbore