Bridge plug

Abstract

The invention relates to a bridge plug. The bridge plug comprises a bridge plug body, wherein a slip and a slip driving part located at the upstream portion of the slip sleeve the bridge plug body, and the slip driving part is connected with the bridge plug body through an elastic receding-prevention mechanism. An elastomer also sleeves the bridge plug body, is located at the downstream portion ofthe slip and is in butt joint with the slip. When the bridge plug is used, an elastic rubber bucket extrudes the slip so as to prevent the slip from receding or getting loose after the slip is mounted and hung and the slip driving part is dismounted.

Description

technical field [0001] The present invention relates to an oilfield development tool, more particularly to a bridge plug. Background technique [0002] In the process of oilfield development, the bridge plug staged fracturing method has been more and more widely used. In this method, cables or coiled tubing are used to run bridge plugs step by step, and fracturing is carried out after the bridge plugs are set and hung. [0003] In order to ensure that the bridge plug can be drilled out so that the reservoir can be further improved in the later stage, the generally used bridge plug uses integral slips made of cast iron as the suspension device, and an anti-retreat mechanism is used to prevent retreat. However, after the integral slips are seated and hung, the anti-retraction mechanism usually has a small amount of retreat due to structural limitations, resulting in failure or unhooking of the slips, which in turn leads to delamination failure of the bridge plug. Contents o...

AI Technical Summary

Problems solved by technology

However, after the integral slips are seated and hung, the anti-retraction mechanism usually has a small amount of retreat due to structural limitations, resulting in failure or unhooking of the slips, which in turn leads to delamination failure of the bridge plug

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