Double drill push-the-bit type guide section

Abstract

The invention discloses a double drill push-the-bit type guide section which includes an oil cylinder outer wrap, an oil cylinder, an internal drill pole and a support plate. The internal drill pole is arranged in the oil cylinder outer wrap and moves along the direction of the axle of the oil cylinder outer wrap. An accommodating cavity is arranged on the outer wall of the oil cylinder outer wrap. A decompression hole is formed in the bottom of the accommodating cavity. The oil cylinder is arranged in the decompression hole. The hole wall of the oil cylinder and the decompression hole slides correspondingly. A seal ring is used for sealing between the hole wall and the oil cylinder. The plunger of the oil cylinder is fixedly connected with the support plate. The oil cylinder outer wrap includes a drilling end and a dynamic end. A convex plate is arranged along the circumference of the inner wall of the oil cylinder outer wrap which is between the accommodating cavity and the dynamic end. The internal drill hole includes a drill pole neck and a drill pole body. The outer diameter of the drill pole body is greater than the outer diameter of the drill pole neck. When the drill pole neck of the internal drill pole moves to correspond to the convex plate, the place between the drill pole neck and the convex plate is provided with an annulus. When the drill pole body of the internal drill pole moves to correspond to the convex plate, the drill pole body is matched with the gap of the convex plate. The double drill push-the-bit type guide section adjusts the extension length of the support plate by adjusting the pressure of the drilling fluid and thus the rate of deviation change of the drilling tools is adjusted.

Description

technical field [0001] The invention relates to the field of geological drilling, in particular to a double drill bit pushing type guide joint. Background technique [0002] In the existing drilling technology, the sandy pebble formation is the main aquifer, but the sandy pebble formation is soft and hard, with poor cementation, and is particularly difficult to drill into. The main problem caused by the staggered soft and hard sand and pebble formation is that the drilling direction is difficult to control, and the problem caused by poor cementation is mainly the poor stability of the borehole wall, which is easy to collapse the hole. At present, the down-the-hole hammer and pipe drilling technology is an effective method for drilling sand and pebble formations, but the down-the-hole hammer and pipe drilling can only be used in non-water formations and the drilling efficiency is low. The double-walled drill pipe is connected to the ground dual-power-head drilling rig, and t...

AI Technical Summary

Problems solved by technology

Third, the mud flow rate is small, so it is not suitable for use in leakage formations

[0005] The limitations of the traditional construction method are: (1) Since the construction personnel have to go down into the narrow shaft, the construction environment is particularly harsh and the safety is poor

(2) Due to the limited space, the ability of the percussion rotary drilling rig is greatly limited, resulting in the length of the radiation hole being greatly limited

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