Four-in-one drilling tool

Abstract

The invention relates to a drilling tool, in particular to a four-in-one drilling tool that achieves highly effective control of the track of medium and deep directional wells. The drilling tool at least includes a drill head (4), a single-bend screw (2), a short drill collar (4), upper stabilizers (5) and a nonmagnetic drill collar (6); the drill head (1), the single-bend screw (2), the short drill collar (4), the upper stabilizers (5) and the nonmagnetic drill collar (6) are connected in turn by screw thread; (3) angular spiral stabilizers (3) are distributed evenly along the external diameter of the single-bend screw (2); the angle building and angle holding for composite drilling is achieved by adjusting the angle of the single-bend screw (2), the short drill collar (4) between the upper stabilizers, or the length of the external diameter of the upper stabilizers (5). The drilling tool can perform track control so as to solve the problems of collision at long and straight well sections, irregular drifting of the easy-to-slope positions, frequent alternation of drilling tools due to the difficulty in controlling the well section tracks, inability for the mechanical drilling speed to release, as well as slow drilling speed.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a four-in-one drilling tool which realizes high-efficiency control of the mid-depth directional well trajectory. Background technique [0002] The Jiyuan block is currently the deepest block of Changqing Petroleum Exploration Bureau's oil well directional wells. The vertical depth of the target layer at Chang 2 is about 2000-2100 meters, with an average well depth of 2120.12 meters; the target layer at Chang 4+5 The depth is about 2350-2550 meters, and the average well depth is about 2600 meters. Using conventional drilling tools for trajectory control, the first-time success rate of directional wells in Fengdikeng Chang 2 oil layer was only 16.19%; the average mechanical penetration rate was only 14.38m / h; the average drilling cycle was 17.26 days, and the well construction cycle was 21.30 days; in 2004, there were 3 cases of out-of-control well filling, and the accident time accounted for 16...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a four-in-one drilling tool, which can control the trajectory, and is used to solve the problem of frequent tripping and reversing drills caused by the long and straight section of the well, the irregular drift of the azimuth drift, and the difficult control of the trajectory of the well section. Problems such as not being able to release tools, ROP, slow drilling speed, etc.

Images