Injection device for high pressure water well

Abstract

The invention discloses an injection device used for a high-pressure water well, and belongs to the technical field of downhole operation tools of oil engineering wells. The injection device comprises an upper connecting pipe, a central pipe and a lower connecting pipe in sequence; the central pipe is sleeved with a rubber cylinder and an upper cylinder sleeve in sequence, and the upper cylinder sleeve is connected with the central pipe in sliding mode, the lower connecting pipe and the upper cylinder sleeve are arranged surrounding the central pipe to form an annular hydraulic cylinder, the annular hydraulic cylinder is communicated with an inner cavity of the central pipe, at least one throttling orifice is formed in the central pipe, and all the throttling orifices are communicated with the outside of the injection device. The injection device used for the high-pressure water well is provided, an existing water injection well technique pipe column and an existing water injection well mouth are used, it is ensured that the water injection well mouth does not bear the injection pressure, the problem of high-pressure water injection well injection without changing the pipe column and the well mouth is solved, the working efficiency is improved, the operating cost is reduced, and at the same time, the water injection well mouth is protected.

Description

technical field [0001] The invention relates to the technical field of downhole operation tools for petroleum engineering water wells, in particular to an injection device for high-pressure water wells. Background technique [0002] At present, there are several types of downhole injection devices for high-pressure water wells in China: [0003] A fully enclosed device for the upper part of the injection layer for downhole operation of high-pressure water injection wells (patent publication number CN102094595A). It includes the screw connected with the threaded thread of the oil pipe, the automatic sealing mechanism matched with the inner wall of the oil pipe, the automatic sealing and anchoring mechanism of the oil sleeve annulus and the water injection mechanism at the tail; The wellhead is set with working setting pressure to seal the annular space of the oil jacket; the automatic sealing mechanism adopts a one-way valve structure to ensure that the high-pressure water i...

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Problems solved by technology

[0007] It can be seen that the existing high-pressure water well injection devices are usually used for acidizing water injection wells. Before the high-pressure water well injection operation, various procedures such as moving the pipe string and changing the wellhead are required, which affects the operation progress and increases the operation cost.

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