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Drilling deviation correction method and deviation correction device based on casing follow-up

A technology of rectifying device and casing, applied in directional drilling and other directions, can solve the problems of increased equipment loss, increased drilling rig torque, poor excavation, etc., and achieves the effect of ensuring normal slag discharge, increasing strength, and simple structure

Active Publication Date: 2020-04-03
BEIJING SHOUER ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved is: the existing wedge-shaped deviation correcting plate may be installed at the front end of the drill bit, which will lead to poor excavation, increase the torque of the drilling rig, cause deformation of the drill bit, and increase equipment loss; and the direction of the wedge-shaped deviation correcting plate must be determined by means of an angle sensor

Method used

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  • Drilling deviation correction method and deviation correction device based on casing follow-up
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  • Drilling deviation correction method and deviation correction device based on casing follow-up

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Experimental program
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Effect test

Embodiment 1

[0043] According to the analysis of the soil layer and soil quality of a certain ground to be drilled, the soil quality is a sand layer; according to the existing engineering construction experience, it has been clearly affected by the sandy stratum, and the drilling direction is easier to deflect in one direction, so the method described in this embodiment is adopted. The drilling deviation correcting device, select the helical unearthed drill pipe, and drill according to the following deviation correcting method.

[0044] Such as figure 1 As shown, the drilling deviation correction device based on the casing follow-up of the present invention includes a drill bit 1, and a casing 2 located outside the drill bit 1. Telescopic movement; the front end of the casing 2 is provided with a steering selection surface 3, the steering selection surface 3 is located on one side of the casing 2 nozzle, and faces the central axis of the casing 2, and the diameter of the casing 2 is the sa...

Embodiment 2

[0049] The stratum is a sand and pebble stratum. According to the existing engineering construction experience, it has been clearly affected by the sand and pebble stratum. The direction of the horizontal drilling is easier to deflect upward. The difference between the down-the-hole hammer head and the deviation correction device is:

[0050] Such as figure 2 As shown, the oblique nozzle at the front end of the casing 2 is provided with an arc panel 32 at its tip, and one end of the arc panel 32 is attached to the wall of the casing 2, and the other end extends horizontally outwards to extend out of the oblique nozzle. The inner surface of the curved panel 32 and the inner surface of the tip of the oblique nozzle jointly form the steering selection surface 3 .

[0051] The central angle corresponding to the arc panel 32 does not exceed 60°.

[0052] The deviation correction device described in Embodiment 1 and Embodiment 2 is applied in the drilling deviation correction meth...

Embodiment 3

[0062] When a certain stratum and soil structure to be drilled are more complicated, such as a sand layer; then adopt the drilling deviation correction device described in this embodiment, select the three-wing drill bit for use, and carry out drilling according to the following deviation correction method.

[0063] Such as Figure 4 As shown, the drilling deviation correction device based on casing follow-up of the present invention includes a drill bit 1, and a casing 2 arranged outside the drill bit 1. The diameter of the casing 2 is adapted to the size of the drill bit 1, and the drill bit 1 is relatively Front and back telescopic movement, the pipe diameter of the casing 2 is adapted to the size of the drill bit 1; the front end of the casing 2 is provided with a steering selection surface 3 and a steering maintenance surface 4, and the steering selection surface 3 is located at the mouth of the casing 2 One side, and facing the direction of the central axis of the casing...

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Abstract

The invention relates to the technical field of underground drilling construction and discloses a drilling deviation correction method and device based on following of a casing pipe. By means of the method, by adjusting the front and rear relative positions between a drilling head and the matched casing pipe on the outer side, the size of an acting force of a stratum on a steering selection surface of an end head of the casing pipe during drilling is changed to adjust the jacking direction of the casing pipe. The device is simple in structure, high in precision of deviation correction and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of underground drilling construction, in particular to a drilling deviation correction method based on casing follow-up and a deviation correction device thereof. Background technique [0002] Drilling is one of the techniques often involved in the construction of surrounding rock reinforcement and water stop in underground space construction. During the drilling process, often due to geological conditions, drilling technology and other reasons, the drilling accuracy is difficult to guarantee. When drilling a deep hole of more than 20 meters, the direction of the drill pipe is easily changed under the action of its own gravity and the inhomogeneity and variability of the surrounding rock, causing the drilling direction to deviate from the design direction, affecting the quality of the hole, and causing drilling problems. The frictional resistance between the rod and the inner wall of the borehole increases,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/10
CPCE21B7/10
Inventor 杨积凯吴小维
Owner BEIJING SHOUER ENG TECH
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