Controllable multiple-pulse gas generator device

Abstract

The invention discloses a controllable multiple-pulse gas generator device, which is used for increasing the recovery ratio of crude oil. The device comprises an igniter, a central tube, an A-section propellant grain, a B-section propellant grain, a plugging tie-in and a centralizer, wherein the high burning rate ignition propellant and the high explosion ignition propellant are respectively placed in the A section of the central tube; the multiple-pulse in the construction process is controlled and realized, by disorderly arranging high, middle and low-burning rate propellant grains matched with the propellant grain of the central tube, in the A and B sections; the plugging tie-in is used for stopping the high-temperature high-pressure air flow, which is generated by burning the ignition propellant in the A section of the central tube, from leaking into the B-section propellant grain, and is used for ensuring that the A-section high-aluminum high-chlorine propellant grain is burnt firstly; and the centralizer is used for ensuring that the shell of propellant grain is not damaged by the friction between the casing tube wall and the shell in the device construction process. By using the device provided by the invention, the high energy generated by the propellant can be safely and efficiently released underground and the well is prevented from being damaged by the high energy. Meanwhile, a longer and difficultly-closed crack is formed, which is beneficial to the construction process.

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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