Hydraulic control retractable short drill collar while drilling

Abstract

The invention relates to the technical field of downhole workover tools in oil and gas fields, and is a retractable short drill collar controlled by fluid while drilling, which includes an upper joint, a connecting outer cylinder, a locking outer cylinder, a mandrel outer cylinder, a lower joint, a mandrel, and a mounting seat , the ball blocking rod, the first shear pin, the second shear pin, the ball seat assembly and the anti-retraction assembly, the connecting outer cylinder is fixedly installed on the outer side of the lower end of the upper joint, and the locking outer cylinder is fixedly installed on the inner side of the lower end of the connecting outer cylinder, and the locking outer cylinder is fixed on the lower end The inner side is fixedly equipped with a mandrel outer cylinder, the inner side of the lower end of the mandrel outer cylinder is fixedly installed together with the outer side of the upper end of the lower joint through the first shear nail, and the mandrel outer cylinder is sleeved with a mandrel that can move up and down inside. The invention has a reasonable and compact structure and is easy to use. By cutting off the first shear nail, the mandrel goes down relative to the connecting outer cylinder, increasing the overall length; by setting the anti-retraction component, the locking outer cylinder is prevented from going down relative to the mandrel, which is highly efficient and stable. and time-saving features.

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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