Pressure-stabilizing milling shaper

Abstract

The invention relates to a pressure-stabilizing milling shaper, which mainly solves the problem of larger milling drag in the horizontal section by mainly using self gravity of a tubular column to provide drilling pressure in the existing milling tool. The pressure-stabilizing milling shaper is characterized in that the lower part of an upper joint (1) is connected with a piston cylinder (3); a piston (6) is arranged in the piston cylinder (3); the lower part of the piston cylinder (3) is connected with a joint (5); the joint (5) is positioned at the exterior of the piston (6); a boss is arranged at the exterior of the piston (6); a spring (4) is arranged between the bottom part of the boss and the joint (5); the bottom part of the joint (5) is connected with a spline sleeve (7) by threads; the interior of the spline sleeve (7) is connected with a spline body (8); the spline body (8) is connected with the piston (6) by threads; the bottom part of the spline body (8) is connected with amilling head (9). The pressure-stabilizing milling shaper has the advantages that the hydraulic pressure is used for providing drilling pressure for a milling head, the influence of larger milling drag of the tubular column in the horizontal section and inclined shaft section is eliminated, and the problem of difficulty in pressurizing of a horizontal well is solved.

Description

technical field [0001] The invention relates to the field of oil fields, in particular to a pressure-stabilizing milling shaper used in the workover of horizontal wells in the oil field. Background technique [0002] With the extension of production time and the increase of operation times, the situation of horizontal well workover is becoming more and more serious. The commonly used grinding and milling tools for horizontal wells are mainly milling cones or milling shoes evolved from vertical wells. When these tools are milled, the drilling pressure is mainly provided by the dead weight of the pipe string. However, due to the particularity of the wellbore structure of horizontal wells, in The friction resistance of the inclined well section and the horizontal section is large, so it is difficult to apply the WOB by the string's own weight. Contents of the invention [0003] In order to overcome the shortage that the existing milling tools mainly rely on the weight of the...

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Problems solved by technology

[0003] In order to overcome the shortage that the existing milling tools mainly rely on the weight of the pipe string to provide drilling pressure and have a large wear resistance in the horizontal section, the present invention provides a stabilized pressure milling shaper. The drill head provides drilling pressure, which eliminates the influence of high pipe string friction in the horizontal section and inclined well section, and solves the problem of difficult pressurization in horizontal wells

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