Body-free coaxial following synergistic perforator

Abstract

The invention discloses a body-free coaxial following synergistic perforator, which comprises a body-free perforator firing mount and a body-free perforating bullet arranged on the firing mount, wherein the body-free perforating bullet comprises a cartridge case, a powder-type cover and a high explosive, the front end outer wall of the cartridge case is provided with an initiation half slot and apressure wire, the front end inner wall of the cartridge case is provided with a booster hole, the back end of the cartridge case is provided with a fracturing powder box airtightly, and special fracturing powder is poured in the fracturing powder box and is distributed annularly along the inner wall of the fracturing powder box, wherein the special fracturing powder is prepared by evenly mixing ammonium permanganate of which the weight percentage is between 50 and 80 percent and aluminum powder of which the weight percentage is between 20 and 50 percent. The body-free coaxial following synergistic perforator has a simple structure and reliable mounting, the special fracturing powder is initiated and performs pulse fracturing on stratums directly while the powder-type cover forms high-speed jet flow to perform perforation, and the fracturing effect of the perforation is good, thus the body-free coaxial following synergistic perforator is particularly suitable for operations of high-density and low-permeability stratums.

Description

technical field [0001] The invention relates to a compound perforating and fracturing device for oil wells, in particular to a coaxial follow-up type perforator without gun body. Background technique [0002] Existing perforating and fracturing compounders are all designed with a gun body. When using it for oil well perforating and fracturing operations, the compound drug detonates in the gun and presses the prefabricated pressure relief hole of the perforating gun to generate pressure on the wellbore. , the well pressure rises to generate pressure on the formation. According to statistics, the depth of the cement sheath after perforation and fracturing is about 800mm, and the fracturing fracture is about 2500mm. Therefore, the energy loss in the entire work process is large, and the effect of perforation and fracturing is average; and Due to the small internal space of the gun body, the design of the whole device is easily restricted. And the existing perforator without gu...

AI Technical Summary

Problems solved by technology

[0002] Existing perforating and fracturing compounders are all designed with a gun body. When using it for oil well perforating and fracturing operations, the compound drug detonates in the gun and presses the prefabricated pressure relief hole of the perforating gun to generate pressure on the wellbore. , the well pressure rises to generate pressure on the formation. According to statistics, the depth of the cement sheath after perforation and fracturing is about 800mm, and the fracturing fracture is about 2500mm. Therefore, the energy loss in the entire work process is large, and the effect of perforation and fracturing is average; and Due to the small internal space of the gun body, the design of the whole device is easily restricted

However, the existing barrelless perforators can only be used for simple oil well perforation operations, and cannot perform fracturing on formations while perforating

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