Fully-enclosed device of upper part of injecting layer for downhole operation of high-pressure water injection well

Abstract

The invention belongs to the field of fully-enclosed equipment of an upper part of an injecting layer for downhole operation of an oil field, and particularly relates to a fully-enclosed device of the upper part of the injecting layer for downhole operation of a high-pressure water injection well. The fully-enclosed device comprises a release (1) connected with an oil pipe screw thread, an automatic sealing mechanism (2) connected with the inner wall of an oil pipe in a matching way, automatic sealing and anchoring mechanisms (3 and 4) for an oil casing annular space and a tail water injecting mechanism; the automatic sealing and anchoring mechanisms (3 and 4) for the oil casing annular space are sealed through rotating a pipe column and applying a work setting force to a wellhead to seal the oil casing annular space; the automatic sealing mechanism (2) adopts a one-way valve structure to ensure that high-pressure water in an oil layer is prevented from channeling from the oil pipe; and a packer of the tail water injecting mechanism is used for sealing so as to ensure injection allocation in a layered way. By virtue of the invention, water injection is stopped when downhole operation is required due to a damaged drivepipe or other emergencies during high-pressure water injecting, full sealing of the oil pipe and oil casing annular space can be automatically realized, thereby the high-pressure water is prevented from channeling, and a repair task on the water injection well can be rapidly completed by minor repair.

Description

technical field [0001] The invention belongs to the field of fully sealing equipment for the upper part of the injection layer for downhole operation in an oil field, and in particular to a fully sealing device for the upper part of the injection layer for downhole operation of a high-pressure water injection well. Background technique [0002] When the pressure of the injection layer is too high to be suppressed (influenced by the formation or other water injection wells), the downhole operation of the water injection well is currently performed at home and abroad with a high-pressure overhaul device to complete this type of well operation. Its serious shortcomings are that the equipment is expensive, the operation is difficult, the construction period is too long, and the operation cost is high. This will have a great impact on the uniform water propulsion effect of the water injection well network. Contents of the invention [0003] The present invention aims to overco...

AI Technical Summary

Problems solved by technology

Its serious shortcomings are that the equipment is expensive, the operation is difficult, the construction period is too long, and the operation cost is high.

This will have a great impact on the uniform water propulsion effect of the water injection well network

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