Multiphase flow drainage and gas recovery tool for gas transmission pipelines

Abstract

The invention provides a multiphase flow drainage and gas recovery tool for gas transmission pipelines, and belongs to the field of oil and gas transmission pipelines. The multiphase flow drainage andgas recovery tool for the gas transmission pipelines comprises a drainage gas collection pipe, a drainage cone, a throttling blocking plate, a fluid guiding body and a spiral line central axis. The drainage gas collecting pipe includes a first diameter reducing cavity and a second diameter reducing cavity integrally communicating with the inlet end and the outlet end of the first diameter reducing cavity. The diameter of the first diameter reducing cavity is larger than the diameter of the second diameter reducing cavity. The drainage cone is of a conical structure, and fluid guiding body isof a spiral structure. The throttling blocking plate is disposed at the position, near the inlet end, in the first diameter reducing cavity. At least three inclined orifices are uniformly arranged around a central axis on the throttling blocking plate, the drainage cone is disposed in the first diameter reducing cavity and the bottom surface of the drainage cone is fixedly connected to one side ofthe throttling blocking plate. One end of the fluid guiding body is fixedly connected to the other side of the throttling blocking plate, one end of the spiral line central axis is fixedly connectedto the other side of the throttling blocking plate, and the spiral line central axis is located in the fluid guiding body. The multiphase flow drainage and gas recovery tool can effectively solve theproblem of liquid accumulation in the ground gas transmission pipelines and restore the capacity of the gas transmission pipelines.

Description

technical field [0001] The invention belongs to the field of petroleum and natural gas transmission pipelines, and in particular relates to a multiphase flow drainage and gas extraction tool for gas transmission pipelines. Background technique [0002] The production process of the oil field gradually enters the middle and late stages, and the productivity decline rate of gas wells is too fast and the energy is insufficient. At present, in conventional drainage gas recovery, the problem of bottom well drainage and gas recovery is mainly solved. Bottom well water is discharged to the wellhead, and then the liquid is brought into the gas gathering station according to the liquid carrying capacity of the gas itself, and then separated and collected. However, with the bottom of the well After the energy gradually decreases, the gas transmission pipeline between the wellhead and the gas gathering station will be affected by terrain and other factors, and its own energy can no lon...

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Problems solved by technology

[0004] (1) Most of them solve the problem of bottomhole fluid accumulation. After the bottomhole fluid accumulation is discharged into the surface pipeline at the wellhead, the production capacity of the gas well still decreases, the gas capacity is insufficient, and the fluid accumulation part is transferred from the bottom of the well to the pipeline, which seriously affects the normal operation gas transmission

[0005] (2) Most of the technologies directly use the principle of flow diversion. When the air flow is relatively large, a central air column will be formed, and a good vortex effect will not be formed when the air flow is too large. It cannot meet the needs of on-site working conditions and cannot meet Fusion of working conditions due to terrain factors or rapid drop in gas well productivity, poor adaptability

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