High pressure water jet-flow deep penetrating perforating and its auxiliary crushing method and apparatus

Abstract

The present invention is high pressure water jet perforating and auxiliary pressure fracturing method and apparatus. The apparatus includes a sheath, a releasing adaptor in the upper end of the sheath, a guiding pipe plug in the lower end, a piston inside the sheath, a wedge connected to the lower end of the piston, a ram head connected to the wedge, a jetting hose with nozzle in the top and connected to a core tube, a control rod connected to the hose and the sucker rod, an upper lock to limit the piston and a lower lock to limit the core tube. Compared with available technology, the present invention has the advantages of further greater treating depth, long and large perforation, increased drainage area and capacity, no contamination to perforation, simplified perforating and pressure fracturing process and saving in oil producing cost.

Description

technical field [0001] The invention relates to an oil exploitation method and its equipment, in particular to a high-pressure water jet deep-penetration perforation and auxiliary fracturing method and device for opening up oil flow channels. Background technique [0002] Opening up oil flow channels is an important process in oil extraction. In the existing technology, opening up the oil flow channel includes using shaped projectile perforation to open the oil flow channel. The main perforation methods have not changed fundamentally for more than half a century. In terms of perforation technology, perforation safety automatic control system, horizontal well perforation technology, super positive pressure perforation technology, cable conveying belt pressure perforation technology, cable perforation staged ignition perforation technology, pipe transmission multi-layer perforation staged detonation technology, azimuth perforation technology, etc., to improve perforation effe...

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by the present invention is to provide a high-pressure water jet deep penetration perforation and auxiliary fracturing method and its device to solve the problem of shallow perforation depth and perforation diameter in oilfield shaped projectile perforation and hydraulic sandblasting perforation. The high-pressure water jet deep penetration perforation and auxiliary fracturing method and its device of the present invention can carry out directional perforation for different oil reservoirs by selecting hydraulic parameters, considering the ground stress conditions, and implementing The hydraulic deep penetration perforation assisted fracturing technology can effectively control the fracture initiation position and development direction, and improve the fracturing effect in low permeability formations, especially in horizontal wells

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