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Double-wall drill-pipe counterflush drilling jet pump drill bit

A double-walled drill pipe and reverse circulation technology, which is applied to drill bits, drilling equipment, earthwork drilling and mining, etc., can solve the problem that the bottom cuttings cannot be cleaned in time, the bottom cuttings return efficiency is reduced, and the cuttings are repeatedly broken and other problems, to achieve the effect of improving the efficiency of rock cleaning at the bottom of the well, improving the efficiency of rock cleaning at the bottom of the well, and increasing the ROP

Inactive Publication Date: 2015-02-04
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the drilling process, the drilling fluid enters the inner pipe of the double-walled drill pipe from the flow conversion joint on the upper part of the bottom hole assembly, and the flow direction changes suddenly, which reduces the return efficiency of the bottom hole cuttings, and the bottom hole cuttings have to be Timely cleaning, resulting in repeated crushing of some rock debris, affecting rock breaking efficiency

Method used

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  • Double-wall drill-pipe counterflush drilling jet pump drill bit
  • Double-wall drill-pipe counterflush drilling jet pump drill bit
  • Double-wall drill-pipe counterflush drilling jet pump drill bit

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Embodiment Construction

[0020] Below in conjunction with accompanying drawing, illustrate the specific embodiment that the present invention proposes, structure, feature and effect thereof, detailed description is as follows:

[0021] A double-wall drill pipe reverse circulation drilling jet pump drill bit, comprising a double-wall drill bit 1, a bridge-type double-pipe flow channel 2 arranged inside the double-wall drill bit, a jet pump 3, and a sand washing device 4 .

[0022] The double-wall drill bit 1 comprises an outer pipe joint 101, an inner pipe joint 102, an outer pipe 103, an inner pipe 104, and a drill bit 105; the outer pipe joint 101 is connected with the outer pipe 103, and the outer pipe 103 is connected with the drill bit 105; The pipe 104 is connected, the inner pipe 104 is connected with the drill bit 105, the inner pipe joint 102 and the inner pipe 104 are located at the inside of the outer pipe joint 101 and the outer pipe 103; the outer pipe joint 101, the inner pipe joint 102, t...

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Abstract

The invention discloses a double-wall drill-pipe counterflush drilling jet pump drill bit which is characterized by comprising a double-wall drill bit and a bridge-type double-pipe flow passage, a jet pump and a sand washing device which are arranged inside the double-wall drill bit. The bridge-type double-pipe flow passage replaces a flowing adapter joint at the upper part of a bottom drilling assembly in the double-wall drill-pipe counterflush drilling and an effect that drilling fluid and debris directly enter an inner pipe of a double-wall drill pipe from a debris suction pipe of the double-wall drill-pipe counterflush drilling jet pump drill bit is implemented, so that the shaft bottom debris cleaning efficiency is improved; the jet pump sucks shaft bottom fluid and shaft bottom pressure difference is reduced, and thus, on one hand, the debris at the shaft bottom is promoted to be separated from the shaft bottom and be lifted in an accelerating manner so as to promote shaft bottom debris cleaning efficiency and on the other hand, underbalance is implemented and a mechanical drilling speed is improved.

Description

technical field [0001] The invention belongs to the field of drilling and oil and gas engineering, and in particular relates to a double-wall drill pipe reverse circulation drilling jet pump drill bit. Background technique [0002] Double-wall drill pipe reverse circulation drilling (Reel Well drilling) technology is a new drilling technology, it is based on double-wall drill pipe, drilling fluid is pumped into the well from the double-wall drill The cuttings are carried in the rod and returned to the ground, so as to realize the closed loop circulation of drilling fluid. The double-wall drill pipe reverse circulation drilling technology was originally proposed to solve the problem of borehole cleaning in coiled tubing drilling. Since the double-wall drill pipe reverse circulation drilling technology was established in 2004, it has been mainly carried out by Statoil and the Norwegian Scientific Research Council for theoretical research, R&D and testing of supporting equipme...

Claims

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Application Information

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IPC IPC(8): E21B10/00E21B10/60E21B21/12
CPCE21B10/60E21B21/12
Inventor 高德利陈绪跃郭柏云赵顺强罗黎敏李斌
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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