Protecting device for wellhead of water injection well

Abstract

The invention discloses a protecting device for a wellhead of a water injection well. The protecting device comprises a supporting foot fixing support, a hydraulic motor and a hydraulic oil cylinder,wherein the hydraulic motor and the hydraulic oil cylinder are fixedly installed on the supporting foot fixing support. A lifting ring is installed on the upper portion of the hydraulic motor; the bottom end of the hydraulic motor is connected with the top end of the hydraulic oil cylinder, and the bottom end of the hydraulic oil cylinder is connected with a sliding pipe through a wellhead connecting flange; the lower end of the sliding pipe is sleeved with a packer, a spring torque sleeve and a gauge cutter sequentially; and the bottom of the gauge cutter is connected with an anti-falling nutthrough a shearing pin. The protecting device is installed on the upper portion of the wellhead of the water injection well; the sliding pipe can be put downwards to the designated position below thewellhead, and setting of the packer is conducted so as to guarantee that liquid can be directly injected into the well without the need of passing through the wellhead; meanwhile, the wellhead protecting device can replace the wellhead to bear pressure, the wellhead pressure-bearing grade is improved, and the operation wellhead does not need to be replaced in the water injection well measure modifying process; and safe injection in water injection well measure operation is achieved, and the operation efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of water injection well operation equipment, and in particular relates to a water injection well head protection device. Background technique [0002] Advance water injection is one of the key technologies in the development of low-permeability reservoirs, and the injection rate of water injection wells is directly related to the production of oil wells. After long-term production, water injection wells will have different degrees of under-injection, and regular measures to reduce pressure and increase injection are required. Since water injection wells are mostly 250-type wellhead Christmas trees, and at the same time, the wellheads of water injection wells are under high-pressure production for a long time, wellhead punctures and leaks often occur during operation, and gates are not tightly sealed. Therefore, the wellheads of water wells need to be replaced before the transformation. Caused the growth of ...

AI Technical Summary

Problems solved by technology

Since water injection wells are mostly 250-type wellhead Christmas trees, and at the same time, the wellheads of water injection wells are under high-pressure production for a long time, wellhead punctures and leaks often occur during operation, and gates are not tightly sealed. Therefore, the wellheads of water wells need to be replaced before the transformation. Caused a growth in the measure cycle and an increase in the cost of the measure

[0003] The existing wellhead protection devices are mainly used for the protection of oil and gas well fracturing and acidizing operations or the simple protection of production wells, which cannot effectively solve the problem of serious fouling of the wellbore and the inner wall of the tubing after the long-term operation of the water injection well, the central pipe cannot be lowered, There are problems such as poor setting of the packer. At the same time, this type of protector does not involve related structures. During the process of pulling out the protector, it is ensured that no stuck pipe occurs, and there is a greater risk in field operations.

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