Drillable hollow core well cementing rubber plug

Abstract

A drillable hollow cementing rubber plug is characterized in that it is composed of a rubber wing, a drillable metal core, and a metal core hollow core. The surrounding of the drillable metal core is a vulcanized rubber wing, and the surrounding of the drillable metal core is rectangular, which is integrated with the surrounding vulcanized rubber and is not easy to fall off. The middle of the metal core can be drilled to make a metal core hollow core, the length of the metal core hollow core is 260 mm, and the diameter is 80 mm. During the cementing process, the rubber plug goes down, and the rubber wings cling to the inner wall of the casing to separate the cement slurry from the displacement medium and scrape off the attachments on the inside of the casing. After bumping and waiting for solidification, lower the drill bit to drill out accessories such as metal core hollow core, rubber plug, bumper seat and so on. Because the drillable metal core is hollow, it is easy to drill out, the drill bit wears less, and takes less time, which improves work efficiency and reduces drilling safety risks.

Description

technical field [0001] The invention relates to a drillable hollow cementing rubber plug. Background technique [0002] Due to the requirements of geological structure or formation lithology, the wellbore casing structure is generally designed as several layers of casing. In the next process, there is a workload of drilling off the upper layer of casing rubber plugs, bumper seats and other accessories. Since the internal accessories such as casing rubber plugs and bumper seats are mostly various metals, the process of drilling out these casing accessories It is time-consuming and labor-intensive, the drill bit is damaged, the drilling time is reduced, and there are safety risks. There has been no good solution to this problem. Contents of the invention [0003] Aiming at the current problems of time-consuming and labor-intensive drilling of rubber wings and accessories, loss of drill bit, reduction of drilling efficiency, and safety risks, the purpose of the present inve...

AI Technical Summary

Problems solved by technology

[0003] In view of the current time-consuming and labor-intensive drilling process of rubber wings and accessories, the loss of drill bits, the reduction of drilling timeliness, and the existence of safety risks, the purpose of the present invention is to disclose a drillable hollow cementing rubber plug

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