Radial sidetracking rotary self-propelled multi-hole jet drill bit

Abstract

The invention relates to a radial sidetrack drilling rotating self-propelled porous jet flow drill bit, which mainly comprises a casing, a rotating drill bit body, a gear type slide ring type combined seal, an opening sealing screw, steel balls and the like, wherein a water inlet is processed at the tail end of the casing; a backward spray nozzle is processed on the casing; a forward spray nozzle and a center spray nozzle are processed on the rotating drill bit body; semicircular grooves are respectively processed in the casing and the rotating drill bit body; the steel balls are placed in the grooves formed between the casing and the rotating drill bit body; the rotating drill bit body is positioned through the steel balls and can rotate around the self axial line; the gear type slide ring type combined seal is adopted between the rotating drill bit body and the casing; through holes are formed at the lateral side of the casing; the steel balls are placed into the grooves through the through holes; and after the steel balls are placed into the grooves, the through holes are sealed through the opening sealing screws. The radial sidetrack drilling rotating self-propelled porous jet flow drill bit can effectively solve the problems of poor jet flow drill bit reaming capability, poor rock breaking hole smooth roundness, bent tracks of hydraulic jet hoses and the like of the hydraulic jet radial sidetrack drilling tiny drill hole technology, and can be widely applied to the hydraulic jet radial horizontal well technology.

Description

technical field [0001] The invention relates to a drilling tool for efficiently breaking rocks and reaming holes by using high-pressure jets, in particular to a rotary self-propelled multi-hole jet drill bit for hydraulic jet radial sidetracking tiny well holes. Background technique [0002] my country is rich in unconventional oil and gas resources such as coalbed methane, shale gas, and tight sandstone oil and gas, with promising prospects for development. The development of unconventional oil and gas resources has been included in the national "Twelfth Five-Year Plan" important development plan. The use of water jet rock breaking to drill radial horizontal wells is to drill one or more small boreholes radially distributed along the radial direction of the wellbore, giving full play to the characteristics of high-pressure water jets, which is helpful for improving the pressure distribution of oil and gas reservoirs and enhancing oil and gas recovery. Compared with single ...

AI Technical Summary

Problems solved by technology

However, there are still many problems to be solved in this technology, among which the key technical problems that need to be solved include: (1) the existing jet drill bit has poor reaming ability or the rock-breaking hole is not smooth, and the roundness is poor; (2) the jet drill bit automatically Insufficient drilling force makes it impossible to drill to the predetermined position; (3) The drilling trajectory of the hydraulic jet hose is curved and difficult to control

[0003] Aiming at the problems of the hydrojet radial sidetracking micro wellbore technology, such as poor reaming ability of the jet bit, poor smoothness and roundness of the rock-breaking hole, insufficient self-progressive force of the jet bit, and curved track of the hydrojet hose, a high-performance jet drill was designed. The jet drill is one of the solutions

At present, there are several types of jet drill design schemes at home and abroad, but through indoor tests and field applications, it is found that these drill bits cannot completely solve the above key problems, such as insufficient hole expansion ability, poor rock-breaking hole smoothness, or overall device length and Large diameter, unable to pass through the steering gear, or easy to get stuck or blocked in complex formations

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