Safety valve of pressure control water injection well

Abstract

The invention discloses a safety valve of a pressure control water injection well. The safety valve comprises a water injection pipe column and a water distributor, wherein the water distributor is sheathed on the water injection pipe column, a water nozzle is arranged on a base pipe of the water distributor, a slide sleeve is sheathed outside the water distributor, a circumferential opening is arranged in the slide sleeve, the top of the slide sleeve is communicated with a pressure cabin, the inner wall of the pressure cabin is the water distributor, pressure balance holes are arranged in the outer wall of the pressure cabin, the bottom of the slide sleeve is communicated with a spring cabin, the inner wall of the spring cabin is the water distributor, a spring is arranged in the spring cabin, and the vertical direction of the spring is the same as the radial direction of the water injection pipe column. The safety valve has the advantages that two functions of constant pressure control and pressure safety control can be selected according to requirements, when the linear water nozzle is processed, the safety valve can realize the constant pressure control and can realize the pressure safety control function; and when the linear water nozzle is not processed, the safety valve can realize the pressure safety control function, so the function is flexible. The safety valve can be widely applied to the water injection well.

Description

technical field [0001] The invention relates to a safety valve for a pressure-controlled water injection well, which belongs to an injection valve for a water injection well in oil production engineering. Background technique [0002] At present, during the injection process of water injection wells, the water quality of the injected water is often not up to standard, resulting in the blockage of the sand control screen and the near-wellbore area, which leads to an increase in the injection pressure of the water injection well and a decrease in the injection rate. For layered water injection wells, the decrease in the injection rate of a certain layer will cause the throttling failure of the water distributor, so that the injection pressure exceeding the expectation will directly act on the formation. If the pressure exceeds the fracture pressure of the formation, it will cause the formation to rupture. Causing geological disasters in water injection wells. [0003] However...

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Problems solved by technology

[0002] At present, during the injection process of water injection wells, the water quality of the injected water is often not up to standard, resulting in the blockage of the sand control screen and the near wellbore area, which leads to an increase in the injection pressure of the water injection well and a decrease in the injection rate.

For layered water injection wells, the decrease in the injection rate of a certain layer will cause the throttling failure of the water distributor, so that the injection pressure exceeding the expectation will directly act on the formation. If the pressure exceeds the fracture pressure of the formation, it will cause the formation to rupture. Geological disasters caused by water injection wells

[0003] However, for water injection wells, the cost of using bottom-hole dynamic pressure monitoring to avoid geological disasters in water injection wells is high, and it is difficult to promote in a large area. Therefore, it is necessary to design an injection valve that can be controlled by injection pressure. In some cases, it will automatically shut down and stop water injection according to the injection pressure, so as to ensure the safety of the water injection well

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