Pressurized operation device and pressurized operation method for completion of gas-driven injection well

Abstract

The invention discloses a pressurized operation device and a pressurized operation method for the completion of a gas-driven injection well, and belongs to the field of pressurized operation. The pressurized operation method of a pressurized operation device for the completion of a gas-driven injection well comprises the following steps: 1) setting a tubing wellhead with a bridge plug; 2) installing the pressurized operation device; 3) lifting a pipe string under pressure; 4) lowering a completion process pipe string under pressure; 5) extruding and injecting annulus protection fluid; 6) setting a packer and sitting a tubing hanger. The pressurized operation method of a pressurized operation device for the completion of a gas-driven injection well solves the shortcomings of high wellhead pressure, difficult pressure relief, long venting time, and high safety and environmental protection pressure of the injection well under the gas-driven condition in an oil field, and can realize the lifting and lowering of the completion pipe string under a wellhead pressurized condition, thereby providing a key technical support for the supporting operation of the shaft of the gas-driven injection well in the oil field.

Description

technical field [0001] The invention belongs to the field of snubbing operation, in particular to a snubbing operation device and a snubbing operation method for gas drive injection well completion. Background technique [0002] At present, in the field of petroleum development, a large number of field tests have proved that CO 2 Oil flooding is one of the most promising enhanced recovery methods in tertiary oil recovery, data show that CO 2 Oil flooding can increase the recovery rate of low-permeability reservoirs by 7% to 15%, and this technology has been widely used at home and abroad. By injecting CO into the reservoir under high pressure 2 , CO 2 Continuously contact with crude oil and extract its heavier hydrocarbon components to enrich, and form a miscible liquid with crude oil, thereby effectively displacing formation crude oil to production wells. [0003] During the gas flooding test, some gas injection wells need to be pulled out of the original well string an...

AI Technical Summary

Problems solved by technology

[0003] During the gas flooding test, some gas injection wells need to be pulled out of the original well string and re-completed due to factors such as casing pressure rise or channel inspection; some water injection wells need to be converted into gas injection wells, but the water injection wells are affected by gas channeling

In the above two cases, since a certain period of gas injection has been implemented in the early stage, the wellhead pressure is relatively high, which will cause the injected gas to return when the pressure is released, and there are risks such as frostbite and suffocation of personnel, and the pressure release time is slow, which affects the operation. cycle, while depressurization will lead to CO, H in the formation 2 The discharge of toxic and harmful gases such as S is subject to the requirements of safety and environmental protection, and the supporting operations of the wellbore are facing huge difficulties.

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