Multifunctional setting ball seat of injection well and working method thereof

Abstract

The invention discloses a multifunctional setting ball seat of an injection well and a working method thereof and belongs to the field of setting ball seats for oil fields. According to the multifunctional setting ball seat of the injection well, a lower joint is arranged at the lower end of an upper joint, and the upper joint communicates to a cavity of the lower joint; the inner diameter of thecavity of the upper joint is greater than that of the lower part, a dissoluble ball is placed on a step, and a plug is arranged on the lower part of the cavity of the upper joint for separating communication between the upper joint and the cavity of the lower joint; and a gas injection bypass is arranged in the circumferential direction of the lower joint. The multifunctional setting ball seat ofthe injection well can achieve purposes of tripping operation of a tubular column, setting of a packer and normal gas injection at the mouth well under a pressure, with a constant pressure or in a decompression condition, so that the technical problem that the tubular column is tripped under pressure when the gas injection well is re-completed or the water injection well is converted into the gasinjection well is solved.

Description

technical field [0001] The invention belongs to the field of setting ball seats for oil fields, and specifically provides a multifunctional blowout prevention setting ball seat for injection wells and a working method thereof. Background technique [0002] With the gradual development of oilfields, most domestic oilfields have entered the tertiary production stage after undergoing the self-spraying and water flooding development stages, and need to develop oil and gas resources through displacement and development of gas injection and chemical agents. Currently injected gases are mainly CO 2 , N 2 , associated gas and other gases, during the gas flooding test, some gas injection wells needed to be pulled out of the original well string and re-completed due to factors such as casing pressure rise or channel detection; some water injection wells needed to be converted into gas injection wells, but The water injection well was affected by factors such as micro-fractures and g...

AI Technical Summary

Problems solved by technology

Currently injected gases are mainly CO 2 , N 2 , associated gas and other gases, 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 detection; some water injection wells need to be converted into gas injection wells, but Gas channeling occurred in the injection well affected by factors such as micro-fractures

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. period, 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. The wellbore supporting needs to adopt snubbing operation. In the process of snubbing the pipe string, it is necessary to consider not only the blowout prevention in the tubing, but also the packer setting. At the same time, it is necessary to ensure that the oil pipe is unblocked after setting to provide a channel for normal gas injection.

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