Abrasive jetting device and method for abrasive jetting flow and jetting perforation and multiple fracturing

Abstract

The invention relates to an abrasive jetting device and a method for abrasive water jet perforation and multiple fracturing; wherein the abrasive jetting device has multistage jet guns which are connected in series; the jet guns are all hollow columns; the side walls thereof are respectively provided with at least two nozzles; the lower part of each stage of jet gun is provided with a packer; the side wall of the packer is provided with a sealing sleeve which can expand outward under the action of high-pressure liquid; the jet guns comprise a first stage bottom jet gun arranged at the lower part of the abrasive jetting device and multistage upper jet guns arranged above the bottom jet gun; wherein all the upper jet guns are respectively provided with a sliding sleeve which can seal the nozzle of the stage of jet gun and sealing sleeve; and the sliding sleeve can slide to the lower part of the sealing sleeve under the action of external force so as to open the nozzle and the sealing sleeve. The invention can be used for casing straight wells or horizontal wells, solves the problem of layered or staged fracturing in the straight wells or the horizontal wells in oil fields, and achieves the purposes of saving fracturing cost, improving fracturing effect and reducing the construction risk.

Description

technical field [0001] The invention relates to an abrasive injection device and an abrasive jet perforation and layered fracturing method. The device and the fracturing method are especially suitable for underground mining operations in the fields of petroleum and natural gas. Background technique [0002] 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-permeability sand control fracturing, repeated fracturing, and deep penetration fracturing. There have been new breakthroughs in fracturing and large-sand-volume...

AI Technical Summary

Problems solved by technology

[0005] A method and device for abrasive jet downhole perforation and slotted layered fracturing disclosed in Chinese Patent Application No. 200710179500.6 is a new technology integrating abrasive perforation, hydraulic isolation and fracturing. However, after each interval of fracturing is completed, the downhole abrasive jet injection device needs to be moved. Moreover, the fracturing process of the formation is completely dependent on hydraulic sealing, so there is no guarantee that the next interval of fracturing will be completed. Fracturing fluid and proppant do not enter the fractured interval during interval

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