Tail pipe milling device and system

Abstract

The invention provides a tail pipe milling device and system. The tail pipe milling device comprises a first connection column, a second connection column, a milling cutter and a guide part. The guidepart is arranged on the second connection column. The bottom end diameter of the guide part is smaller than the inner diameter of a tail pipe. The top end diameter of the guide part is larger than the inner diameter of the tail pipe. The guide part is provided with a cutting part. The milling cutter is arranged on the first connection column. The diameter of the milling cutter is larger than thetop end diameter of the guide part. The milling cutter is used for milling the inner wall of the tail pipe so as to form a sealing face. When the part, on the lower portion of a casing, of the tail pipe is cut, the side wall, in a shape of a circular truncated cone, of the guide part makes contact with the inner wall of the tail pipe first, thus the axis of the guide part and the axis of the tailpipe are collinear, and the axis of the milling cutter and the axis of the tail pipe are collinear; and then a drill rod is controlled to rotate, then the milling cutter cuts the inner wall of the tail pipe to form the sealing face, precision of the sealing face is high, and leakproofness between the sealing face and a matching face is good.

Description

technical field [0001] The invention relates to the technical field of oil well equipment processing, in particular to a liner milling device and a milling system. Background technique [0002] In the process of oil extraction, it is necessary to drill the well pipe underground first, and set the casing in the well pipe; then set the oil pump in the casing to extract oil; but because there are particles such as stones at the bottom of the casing, the entry of particles is easy to damage the oil pump. Therefore, how to prevent particles from entering the oil pump has become a research hotspot. [0003] In the prior art, a tailpipe is arranged at the bottom of the casing, and a plurality of filter holes are arranged on the side wall of the tailpipe, and a plugging block is arranged at the bottom of the tailpipe, so that oil can only enter the tailpipe through the filter holes , and then sucked into the oil pump; the filter hole can prevent particles from entering the tailpipe...

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Problems solved by technology

[0005] In view of this, the present invention provides a liner milling device and a milling system to solve the problem in the prior art that the axis of the cylindrical milling cutter is difficult to coincide with the axis of the liner during the milling process due to the complex downhole environment. Line, so that the precision of the sealing surface is insufficient, which in turn leads to the technical problem of poor sealing between the sealing surface and the mating surface

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