A double-wall drill pipe reverse circulation drilling tangential injection swirl jet pump bit
A double-walled drill pipe and injection technology, which is applied in the direction of drill bit, drilling equipment, earthwork drilling and mining, etc., can solve the problem that the cuttings at the bottom of the well cannot be cleaned in time, the return efficiency of bottom cuttings is reduced, and the rock breaking efficiency is affected and other problems, to achieve the effect of improving the efficiency of rock cleaning, improving the efficiency of rock cleaning, and increasing the range of flushing
Inactive Publication Date: 2017-02-15
CHINA UNIV OF PETROLEUM (BEIJING) +1
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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
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[0022] 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:
[0023] A double-wall drill pipe reverse circulation drilling tangential injection swirl jet pump drill bit, comprising a double-wall drill bit 1 and a bridge-type double-pipe flow channel 2 arranged inside the double-wall drill bit, a jet pump 3, and a tangential injection swirl jet pump Sand washing device 4.
[0024] 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 out...
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The invention discloses a tangential injection type swirl flow jet flow pump drill bit of a double-wall drilling rod reverse circulating drilling well. The tangential injection type swirl flow jet flow pump drill bit is characterized in that the drill bit comprises a double-wall drill bit body, a bridge type double-pipe flow channel, a jet flow pump and a tangential injection type swirl flow jet flow sand washing device, wherein the bridge type double-pipe flow channel is arranged in the double-wall drill bit body. The bridge type double-pipe flow channel replaces a flow conversion connector on the upper portion of drill tool combination at the bottom in a double-wall drilling rod reverse circulating drilling well, the drilling fluid and rock debris enter an inner tube of a double-wall drilling rod directly from a rock debris suction pipe of the tangential injection type swirl flow jet flow pump drill bit of the double-wall drilling rod reverse circulating drilling well, and thus the well bottom rock debris cleaning efficiency is improved; the jet pump pumps and sucks the well bottom fluid to reduce the well bottom pressure difference, unbalance is achieved, and thus the mechanical drilling speed is increased; according to the tangential injection type swirl flow jet flow sand washing device, high-speed rotating jet flow is generated through tangential injection type rotation jet flow spray nozzles, a well bottom vortex flow field beneficial to rock debris cleaning is formed, the stress condition of the well bottom rock debris is improved, and the well bottom rock debris cleaning efficiency 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 tangential injection swirl jet pump drill bit. Background technique [0002] Double-wall drill pipe reverse circulation drilling (Reel Well drilling) 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 Carry cuttings back 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 equipment. In 2005,...
Claims
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IPC IPC(8): E21B10/60E21B10/61
CPCE21B10/60E21B10/61
Inventor 高德利陈绪跃郭柏云李斌刘晓坡张向华
Owner CHINA UNIV OF PETROLEUM (BEIJING)