Radial drilling device for abrasive water jet flow

Abstract

The invention discloses a radial drilling device for abrasive water jet flow, and the device comprises an outer barrel, a central tube, a windowing mechanism, a steering mechanism, and a resetting mechanism, wherein the central tube can slidingly pass through the outer barrel along the axial direction of the outer barrel and is provided with a stressed part to drive the central tube to be moved along a first direction under hydraulic pressure; the windowing mechanism oppositely sliding along the central tube is provided with a jet element to window a sleeve; a steering passageway with an inlet end and an outlet end is arranged in the steering mechanism fixedly connected with the windowing mechanism, the steering mechanism can be provided with a drilling element for drilling rocks at the windowed position; the resetting mechanism is used to drive the central tube to be moved along a second direction after the steering mechanism is decompressed, and the first direction is opposite to the second direction; the resetting distance of the resetting mechanism is the same as that between the jet element and the outlet end of the steering passageway. Through the radial drilling device for abrasive water jet flow, the compact and hard rock can be effectively opened.

Description

technical field [0001] The invention relates to a drilling tool for oil and gas exploitation, in particular to an abrasive water jet radial drilling device. Background technique [0002] Most of the oil and gas wells need to perforate in the oil and gas intervals after the oil layer casing cementing is completed, so as to realize the oil and gas communication between the formation and the wellbore. [0003] The perforation technology currently used in oil and gas wells has a maximum perforation penetration depth of about one meter. The perforation depth is low and cannot connect to the dead oil zone, so that it is impossible to increase the drainage radius, improve the permeability conditions, increase the production of the oil well and improve the oil layer. recovery purpose. [0004] In order to increase the penetration depth of the perforation, the oil well radial drilling technique is commonly used at present. The oil well radial drilling technology specifically uses d...

AI Technical Summary

Problems solved by technology

The above-mentioned tool combination has long flexible connecting parts. When the well deviation is greater than 10° or the tubing contains crude oil with high viscosity, it is easy to bend when encountering resistance, for example, when it is stuck when running in or out of the well , prone to accidents

[0008] Secondly, the radial hydraulic jet drilling technology requires two different sets of tools to be lowered into the window and drilling processes for operation. For an oil well string of about 3000 meters, the cutter tool needs to be used for the upper and lower pipe strings. The operation time is at least 9 hours, and the window opening time needs at least 10 hours, so the radial hydraulic jet drilling technology has the problems of time-consuming process and low efficiency

[0009] In addition, the radial hydrojet drilling technology cannot achieve drilling in dense and hard rocks.

Images