SU1020562A1 - Directional drilling tool - Google Patents

Abstract

SHELL FOR DIRECTIONAL DRILLING on Aut. St. 386117, characterized in that, in order to increase the accuracy of the well wiring by maintaining the zenith direction of the projectile, the lower part of the body has a protrusion with a supporting surface located opposite to the slider, and the distance from the supporting surface to the axis of the projectile is selected in accordance with by the ratio. where r is the distance from the bearing surface to the axis of the projectile, m; dn - diameter of rock cutting tool, m; I is the distance from the end of the rock-cutting tool to the bearing surface, m; H, is the largest possible angular displacement of the shell of the projectile in the well, hail.

Description

The invention relates to mining, in particular to devices for changing the direction of a borehole.

According to the main author. St. No. 386117 is known for a drill for directional drilling, comprising a shaft, a housing made of two parts, having bevels, a sliding slide with ends facing with each other, with which it interacts with the corresponding bevels of the ends of the parts of the housing 1.

A disadvantage of the known projectile is the low accuracy of well bore in the zenith direction due to the additional effect on the rock-destructive tool of the negative tilting moment, the direction of which is opposite to that of the milling load.

The purpose of the invention is to improve the accuracy of the well wiring by maintaining the projectile zenith direction.

The goal is achieved by the fact that in the device the lower part of the body has a protrusion with a supporting surface located opposite to the sliding slider, and the distance from the supporting surface to the axis of the projectile is selected in accordance with the ratio

 0.5- -Ht9 "f,,

where r is the distance from the reference surface

to the axis of the shot, yes, m;

dj, diameter of rock cutting tool, m;

i is the distance from the end of the rock cutting tool to the bearing surface, m;

fj - the greatest possible angular displacement of the shell of the projectile in the well, hail.

FIG. 1 shows the proposed shot, a general view; in fig. 2 and 3 - the position of the projectile in the process of drilling.

The tool for directional drilling contains a shaft 1, Kopriyc, made of two parts - upper 2 and lower 3, retractable slider 4. The lower part 3 of the body has a protrusion 5, a supporting surface 6 located opposite the retractable slider 4. On the shaft 1 a rock-breaking tool 7 is installed The shaft 1 is made telescopic, which is provided by a splined node 8, and freely rotates relative to the shell of the props on the supports 9. On the shaft 1 there is a spring 10 interacting with the upper part 2 of the body. Snar d works as follows. After descent and orientation, the projectile is placed on the face and creates an axial load. At the same time, the spline assembly 8 is closed and the spring 10 is compressed. By acting on the upper part 2 of the housing, the spring 10 causes

move it down, pushing the slider 4 all the way into the wall of the well. Resting against the borehole wall, the retractable slider 4 creates a milling force on the rock-cutting tool 7. In this case, the protrusion 5 abuts against the wall of the well with its supporting surface 6, preventing the occurrence of an angular displacement, creating a negative tilting moment, the direction

whose action is opposite to the direction of the curvature resulting from the action of the milling load.

If the distance H from the bearing surface to the axis of the projectile is less than half the diameter of the rock cutting tool,

then in angular displacement, the angular displacement of the shell axis. relative to the axis of the well, resulting in a negative tipping moment. The direction of the curvature of the well under the action of this moment will be opposite to the direction of the curvature of the milling load, which will reduce the efficiency of the curvature process. If the distance from the axis of the bearing surface to the axis of the shot is half the diameter of the rock destructive tool (Fig. 2), the projectile is aligned with the hole and only the milling load will act on the rock destructive tool.

With a further increase in the distance from the bearing surface to the axis of the projectile, a certain angular displacement of the axis of the projectile relative to the axis of the well is created, causing the formation of a positive tilting moment acting on the rock bending tool (Fig. 3). In this case, both the milling load and the positive tilting moment will act on the tool, and the direction of curvature of the well under the action of the positive tipping moment will coincide with the direction

0 curvature due to the milling load, thereby increasing the efficiency of the curvature process. However, due to the fact that the lateral dimensions of the projectile may exceed the diameter of the well and it will not be possible to lower it into the well, the distance r from the bearing surface to the axis of the projectile cannot exceed the value defined by the expression

- 0 where r is the distance from the reference surface

to the axis of the shot, yes, m;

dji diameter rock cutting tool, m;

i is the distance from the end of the rock-crushing tool to the reference surface 5, m;

H - the largest possible angular displacement of the shell casing in the well, hail.

The proposed device reduces the costs associated with re-drilling of wells by increasing the accuracy of the inclined wells.

Fig.d

Claims (2)

SHIP FOR DIRECTED DRILLING by ed. St. No. 386117, characterized in that, in order to improve the accuracy of the well’s wiring by maintaining the antiaircraft direction of the projectile, the lower part of the body has a protrusion with a supporting surface located opposite to the sliding slider, and the distance from the supporting surface to the axis of the projectile is selected in accordance with the ratio G "0.5 - ^dn h-1 Wed 2 coscf | ’* Where r is the distance from the supporting surface to the axis of the projectile, m; d _n is the diameter of the rock cutting tool, m; I is the distance from the end of the rock cutting tool to the supporting surface, m; H, - the largest possible angular displacement of the shell in the well, deg. ig 1.020562