A kind of directional reaming screw drilling tool

Abstract

The invention discloses a reaming screw drill tool for orientation. The reaming screw drill tool comprises a rotor, a shell, a centralizer and a reaming cutter, wherein the centralizer is arranged on the shell and provided with a plurality of first guide holes in the radial direction and first pistons arranged in the first guide holes, and the first pistons are connected with correcting blocks; the reaming cutter is arranged at the head end of the rotor and provided with a plurality of second guide holes in the radial direction and second pistons arranged in the second guide holes, and second pistons are connected with cutting cutter wings; an inner hole in the rotor segment where the centralizer and the reaming cutter are located is a mud hole, and a sealing cavity is communicated with the first guide holes and the second guide holes through the mud hole. The screw drill tool has good correcting adaptability.

Description

technical field [0001] The invention relates to a reaming screw drilling tool for orientation, in particular to a screw drilling tool which can realize borehole enlargement in the process of orientation. Background technique [0002] With the continuous development of petroleum exploration and development technology and drilling technology, drilling technologies such as directional wells, cluster wells, and horizontal wells have been more and more widely used. [0003] In the current oil drilling process, screw drilling tools have been widely used in directional operations because of their strong build-up capability and wide range of build-up rates. During the orientation process, the bending angle direction of the screw drilling tool’s curved shell cannot be changed. The motor of the screw drilling tool is the only way to provide power to the drill bit. When the turntable is turned on, the orientation effect of the screw drilling tool will be Disappeared. [0004] The exi...

AI Technical Summary

Problems solved by technology

[0004] The existing reaming tools are mechanical or hydraulic, but the power source of this kind of reaming tools comes from the torque transmitted by the turntable rotation of the turning machine. Since the direction of the bending angle will change continuously with the rotation of the turntable, Therefore, the reaming tools on the market cannot realize the directional function

[0005] The screw drilling tool drives the drill bit to rotate during the drilling process, and the diameter of the drilled hole is determined by the diameter of the drill bit. At the same time, the hole tools are rotated and drilled to achieve the purpose of reaming, but at this time, the centralizer on the screw drilling tool shell can not play the role of supporting the well wall with the expansion of the wellbore, which seriously affects the build-up rate and cannot achieve directional build-up. incline

[0006] In addition, during the use of screw drilling tools, it is inevitable to encounter easy-shrinkable formations, such as gypsum formations, which are squeezed by easy-shrinkable formations, and the directional drilling and tripping of drilling tools are greatly restricted.

[0007] Chinese patent document CN104948122A discloses a ball-type centralizer for screw drilling tools, which includes a body and balls, wherein the body is a rib-type structure, which is a fixed structure, and the body of the fixed structure determines that its use will be affected Great limitations, such as not getting bigger with eye dilation, so it can't play a righting effect

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