Method and device for detonating and fracturing scattered objects

Abstract

The invention belongs to the field of petroleum exploration and development, and relates to a method and a device for detonating and fracturing scattered objects. By the invention, detonated and fractured debris can be completely lifted out of a shaft, and the shaft is prevented from being polluted by falling objects. The detonating and fracturing device comprises a cable protection pipe component, an ignition component and a fracturing bomb component which are connected in turn, wherein the fracturing bomb component comprises a central pipe made of carbon steel or alloy steel and a fracturing powder column arranged at the periphery of the central pipe; a detonating cord is arranged in the central pipe; and the wall of the central pipe is provided with a plurality of through holes for ignition. During operation, the detonating and fracturing device is fed into an oil gas well by a cable and is positioned, a detonator in the ignition component of the detonating and fracturing device is detonated by the cable, the detonating cord in the central pipe of the fracturing bomb component is detonated by the detonator, and the fracturing powder column which is encircled outside the central pipe is directly ignited by detonating gas produced after the detonating cord is detonated through the through holes on the wall of the central pipe, so that the fracturing powder column is quickly combusted; and high pressure is established in the shaft, and a formation is fractured to do work.

Description

technical field [0001] The invention belongs to the field of petroleum exploration and development, and relates to a deflagration fracturing method and device for oil, gas, and water well stimulation measures, in particular to a deflagration fracturing wreckage that can be lifted out of the wellbore without causing wellbore falling objects Contaminated fallout deflagration fracturing method and device. Background technique [0002] Deflagration fracturing technology is an effective measure to increase production and injection for re-fracturing old wells whose production capacity has been reduced or new wells whose production capacity cannot meet the requirements due to low-porosity and low-permeability reservoirs. This technology uses the pressure of gunpowder gas as the driving force to perform fracturing work on the formation, so that a number of radial fractures that are not affected by in-situ stress are formed in the near-wellbore zone, and at the same time, the opening...

AI Technical Summary

Problems solved by technology

When igniting, the high-temperature and high-pressure gas formed by the deflagration of the ignition powder in the central aluminum tube breaks the tube wall of the central tube, and then ignites the fracturing bomb outside the central aluminum tube, and the central aluminum tube is also exploded during the combustion process. Some fragments, when the fracturing bomb is burned, a large number of central aluminum pipe debris will all fall into the wellbore, causing pollution to the oil well, and even causing a bridge blockage accident, seriously affecting the normal progress of the next process

In addition, the deflagration fracturing device of this structure also has the following defects: First, due to the uneven distribution of ignition energy in the central aluminum tube or the mechanical defects of the aluminum tube wall, the ignition intensity of the fracturing bomb will be inconsistent and the ignition position will be inconsistent. Determine the phenomenon, so that the pressure rise rate and peak pressure cannot be effectively controlled, and the expected fracturing effect cannot be achieved; second, the fracturing bomb and the central aluminum tube are blown up during the combustion process, and they are in a state of free combustion in the wellbore. Disperses energy and reduces work efficiency

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