A kind of composite bridge plug

Abstract

The invention discloses a composite bridge plug, which belongs to the technical field of downhole plugging tools in oil and gas fields. One end is provided with a thread, and the other end of the center rod is connected to the lower joint through a pin; the ball seat, the support body, and the lower joint are sequentially set on the center rod, and the ball seat is connected to one end of the support body, and the ball seat is close to the threaded end of the center rod. One end is provided with a concave surface matching the soluble fracturing ball. The end connecting the ball seat and the support body is tapered. The joint between the ball seat and the support body is covered with a rubber sleeve. Located between the conflicting part and the ball seat, the end of the support body that is not connected to the ball seat is tapered and connected to the lower joint, and the tapered end of the support body cooperates with the slips. After fracturing and acidizing construction operations, the on-site drainage and production can be realized by dissolving the fracturing balls without drilling and removing bridge plugs.

Description

technical field [0001] The invention relates to the technical field of downhole plugging tools for oil and gas fields, in particular to a composite bridge plug. Background technique [0002] Shale gas is a very important unconventional natural gas resource extracted from shale formations. In order to achieve a breakthrough in the industrialization of shale gas, the focus is on geological selection evaluation, reservoir identification, horizontal well staged fracturing, etc. technology as a breakthrough; the future development of shale gas will mainly rely on slim hole drilling and early open hole completion to reduce engineering costs, rely on horizontal well staged fracturing technology to increase single well production, and rely on long horizontal section horizontal wells to extend the production cycle of oil and gas wells development mode, and ultimately realize the beneficial development of shale gas. [0003] At present, in the fracturing technology, there is a method...

AI Technical Summary

Problems solved by technology

[0005] As the depth of shale gas development wells increases and the horizontal section grows, after fracturing and acidizing operations, due to the length limitation of coiled tubing, it is impossible to complete the construction of development wells with a depth of more than 5000m, and the coiled tubing is in the horizontal section. After traveling more than 1500m, it will self-lock and cannot continue to move forward. As a result, the coiled tubing cannot guide the drilling and milling tool to drill out the bridge plug, and subsequent normal production cannot be realized. Therefore, the existing composite bridge plug has the risk of being difficult to drill out, and now Some composite bridge plugs have many parts, complex structure and high cost

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