While-drilling hydraulic control telescopic short drill collar

Abstract

The invention relates to the technical field of oil and gas field underground workover tools, in particular to a while-drilling hydraulic control telescopic short drill collar which comprises an upperconnector, a connecting outer barrel, a locking outer barrel, a mandrel outer barrel, a lower connector, a mandrel, a mounting seat, a ball blocking rod, a first shear pin, a second shear pin, a ballseat assembly and a retaining assembly. The connecting outer barrel is fixedly installed at the outer side of the lower end of the upper connector, the locking outer barrel is fixedly installed at the inner side of the lower end of the connecting outer barrel, the mandrel outer barrel is fixedly installed at the inner side of the lower end of the locking outer barrel, the inner side of the lowerend of the mandrel outer barrel and the outer side of the upper end of the lower connector are fixedly installed together through the first shear pin, and the mandrel capable of vertically moving in the mandrel outer barrel is sleeved with the mandrel outer barrel. The while-drilling hydraulic control telescopic short drill collar is reasonable and compact in structure and convenient to use, the mandrel descends relative to the connecting outer barrel by cutting off the first shear pin, and the overall length is increased; and by the arrangement of the retaining assembly, the locking outer barrel is prevented from descending relative to the mandrel, and the beneficial effects of being efficient, stable, time-saving and labor-saving are achieved.

Description

technical field [0001] The invention relates to the technical field of downhole workover tools in oil and gas fields, and relates to a retractable short drill collar controlled by fluid while drilling. Background technique [0002] With the advancement of oil exploration and development technology, the drilling depth of oil and gas wells has reached nearly 10,000 meters. When drilling deep wells and ultra-deep wells, most of the oil layer casings in the target layer are suspended on the upper part of the production layer with casings with a smaller specification. Completion is carried out, wherein the hanger diameter reduction of the suspended casing of the first level is called "flare mouth". [0003] Before running into the completion packer, the bell mouth must be milled to remove flanging, burrs, etc. at the bell mouth to avoid damage to the packer rubber tube. At the same time, the small sleeve below the bell mouth The pipe is drilled, scraped and other operations are ...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a retractable short drill collar with fluid control while drilling, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that existing downhole workover tools cannot complete the bell mouth grinding and wall scraping operations in one trip. The problem, and the problem of poor sealing of the pawl ball seat

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