Offshore drilling opening reaming drilling tool

Abstract

The invention relates to the technical field of drilling equipment, and discloses an offshore drilling opening reaming drilling tool. The offshore drilling opening reaming drilling tool comprises an upper joint, wherein a communication opening is formed in the upper joint; an outside communicating pipe fixedly communicates to the left side surface of the upper joint; a spacer sleeve is fixedly mounted in the outside communicating pipe in a sleeving manner; a piston device is movably mounted in the spacer sleeve in the sleeving manner; a spring which cooperates with the spacer sleeve is movablymounted on the external surface of the piston device in the sleeving manner; a first decompression hole and a second decompression hole which communicate with the external surface of the outside communicating pipe are formed in the external surface of the spacer sleeve; and a residue discharging device is movably mounted on the left side of the first decompression hole, on the external surface ofthe outside communicating pipe. According to the offshore drilling opening reaming drilling tool disclosed by the invention, through the cooperation of a set hinging point, the piston device, a moving rod, an arc-shaped block and a ball, in the using process, a hole drilling and scraping device can extend along with a reaming knife, so that the leveling of the reaming surface is realized, and themounting of the pipeline in the later stage of well drilling is guaranteed to be smooth.

Description

technical field [0001] The invention relates to the technical field of drilling equipment, in particular to an ocean drilling wellhead reaming drilling tool. Background technique [0002] Offshore drilling is to install drilling, mud, cementing, power, navigation, anchoring, lifting and other equipment in a concentrated manner on the drilling platform or drilling ship with a very limited activity area. Drilling tools, drill bits and reaming drills are the same thing, but they play different roles. They all use the cutting edge for drilling; the drill bit drills the bottom hole, and the reaming drill enlarges the bottom hole drilled by the drill bit. [0003] In the process of using the current reaming drilling tool, the external liquid pressure is used to drive the piston to move, and then through the action of the piston, the reaming knife is gradually opened, so that the reaming knife can act on the wellhead, when the piston When running to the pressure relief hole, the p...

AI Technical Summary

Problems solved by technology

[0003] During the use of the current reaming drilling tool, the external liquid pressure is used to drive the piston to move, and then through the action of the piston, the reaming knife is gradually opened, so that the reaming knife can act on the wellhead. When the piston When running to the pressure relief hole, the opening power of the reaming knife depends on the effect of drilling pressure, so that the reaming knife has a thrust. There is no force-bearing device on the side, so the reaming knife is prone to bending, and the surface of the borehole wall that appears when the reaming knife expands is prone to surface burrs, which cannot be removed. At the same time, the debris that appears during the reaming process cannot be discharged from the well , making later cleaning more troublesome

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