Drillable bridge plug double-pipe separate injection tool

Abstract

The invention relates to the technical field of oil field water injection and water injection, and particularly relates to a drillable bridge plug double-pipe separate injection tool. The drillable bridge plug double-pipe separate injection tool comprises wellhead separate injection pipelines, an upper-layer bridge plug, a lower-layer bridge plug, an outer string and an inner string, wherein the upper-layer bridge plug and the lower-layer bridge plug are both hollow bridge plugs; the outer string is inserted into the upper-layer bridge plug in a sealed mode; the inner string penetrates throughthe outer string and is inserted into the lower-layer bridge plug in a sealed mode; an annular space is reserved between the inner string and the outer string; the outer string comprises an outer oilpipe, an upper insertion pipe centralizer and an upper-layer sealing insertion pipe which are sequentially connected from top to bottom; the upper-layer sealing insertion pipe is inserted into the upper-layer bridge plug in a sealed mode; the inner pipe column comprises an inner oil pipe, a lower-layer sealing insertion pipe and a lower insertion pipe centralizer which are sequentially connectedfrom top to bottom; and the lower-layer sealing insertion pipe is inserted into the lower-layer bridge plug in a sealed mode. The drillable bridge plug double-pipe separate injection tool solves the problem that an existing concentric double-pipe separate injection process string is unreliable, and is reliable in sealing.

Description

technical field [0001] The invention relates to the technical field of oilfield water injection and polymer injection, in particular to a drillable bridge plug double-pipe injection tool. Background technique [0002] The concentric double-pipe separate injection technology can well solve the problem of prominent contradictions between layers. After the packers are used to isolate each layer, each layer corresponds to the corresponding tubing, and the injection flow rate of each layer is adjusted through the wellhead separate injection process. , to form a throttling pressure difference, and solve the contradiction of large difference in injection pressure between layers. [0003] The concentric double-pipe dispensing string is composed of an inner pipe, an outer pipe, a packer and a sealing device. The packer includes two, which are respectively installed at the upper and lower ends of the outer pipe. The sealing device connects the inner pipe and the The outer tubes are s...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low reliability of the conventional concentric double-pipe dispensing string in the background technology, the present invention provides a drillable bridge plug double-pipe dispensing tool, which has high reliability

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