Controllable multi-pulse gas generator

Abstract

The invention discloses a controllable multi-pulse gas generating device, which is used for improving the recovery rate of crude oil. The device is composed of an igniter, a central tube, a section A propellant grain, a B section propellant grain, a plugging joint and a centralizer. A high burning rate ignition propellant and a high explosive hot spot are respectively placed in the A section of the central tube. Fire propellant, by setting different sequences of high, medium and low burning rate propellant grains in A and B sections and the matching of central tube grains, the control realizes multiple pulses during the construction process; the plugging joint is used to Prevent the high-temperature and high-pressure airflow after the ignition propellant in the center tube of section A from leaking into the center tube of the charge column in section B, and ensure that the high-alumina and high-chlorine propellant charge in section A burns first, and the centralizer ensures that the shell of the charge column in the construction of the device is not protected from the casing wall. Frictional damage. The invention realizes the safe and effective release of the high energy produced by the propellant downhole without causing damage to the well. At the same time, long and difficult to close cracks are formed, which is conducive to the progress of construction.

Description

technical field [0001] The invention belongs to the technical field of gas generating devices, and relates to a novel controllable multi-pulse gas generating device for high-energy gas fracturing, which can be used for oilfield development and improve crude oil recovery. Background technique [0002] As a measure for oilfield development and production stimulation, high-energy gas fracturing technology has the advantages of simple construction, low cost, and quick results. High-energy gas is usually generated after combustion of composite solid propellant or double-base drug. Since composite solid propellant has better temperature resistance and higher energy, it is the first choice for implementing this measure. When the geological conditions are suitable for this measure, a certain amount of composite solid propellant is ignited in the operating part of the oil well or water injection well, and the high-temperature and high-pressure gas produced will act to form multiple r...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: for high-energy gas fracturing in oilfield operation and construction, it is urgent to release higher energy in a safe and effective way downhole to form longer and difficult-to-close fractures without affecting the well body. The problem of damage to facilities, by using high-aluminum, high-chlorine propellants with different burning rates, high-aluminum and high-chlorine propellants with different burning rates and detonation heats, the connection sequence and placement of ignition propellants with different burning rates and detonation heat are used to achieve peak pressure during deflagration and fracturing controlled within a safe range,

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