Abrasive material jet injection device

Abstract

The invention relates to an abrasive material jet injection device which is provided with a spray gun for injecting abrasive material jet, wherein the spray gun is provided with at least two nozzles, and the spray gun is connected with an oil tube. The abrasive material jet injection device has simple structure and is easy to assemble and maintain. The key part (nozzle) in the device has longer service life so as to satisfy the requirements of two operations of perforating and fracturing. Because a check valve and a sieve tube are arranged, the phenomenon that the nozzle of the injection device is subjected to sand jamming can be greatly lowered; meanwhile, when the device is subjected to sand jamming faults, base fluid is pumped into the annulus of an annular tube, the base fluid enters the injection device via the check valve by the sieve tube, which is convenient to flush the device, and therefore the well can be subjected to backflushing to ensure that the operation is successfully carried out. Because a packer is omitted, construction equipment is simplified. According to the abrasive material jet injection device, the defect of the known technology is overcome, abrasive material jet pore forming and fracturing are combined, and therefore layering can be precisely carried out in a vertical well or sectional fracturing can be precisely carried out in a horizontal well section.

Description

[0001] The present invention is a divisional application with the application number: 200710179500.6, the application date: December 14, 2007, and the title of the invention: "Abrasive jet downhole perforation, slotted layered fracturing method and device". technical field [0002] The invention relates to an abrasive jet injection device. The invention is especially suitable for the fields of petroleum and natural gas exploitation. Background technique [0003] In 1947, the hydraulic fracturing stimulation technology was first implemented in a vertical well in the HUGOTON gas field in the southwest of KANSAS in the United States. After nearly half a century of development, especially since the late 1980s, in fracturing design, fracturing fluid And additives, proppants, fracturing equipment and monitoring instruments, and fracture monitoring have all achieved rapid development, making hydraulic fracturing technology widely used in fracture height control technology, high-per...

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Problems solved by technology

[0005] Chinese patent application No. 200510072121.8 discloses a "horizontal well fracturing method". The main defect of this method is that it cannot control the fracture initiation position in the horizontal well section and cannot realize staged fracturing

In addition, it is difficult to operate on-site construction by analyzing the frictional resistance of the holes and judging the number of liquid inlet holes through the step-down discharge, which leads to inaccurate amounts of temporary plugging agents and cannot effectively plug the cracks that have been opened; Otherwise, the working reliability of the plugging agent will also seriously affect the plugging effect on the fractures that have been opened.

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