A hangable real-time control downhole gas-liquid separation combined lifting system

Abstract

The invention discloses a real-time regulated downhole gas-liquid separation combination lift system capable of being suspended. The system includes an oil tube connected to a suspended three-way assembly, a jet-pump lift system is arranged in the suspended three-way assembly, an electric-pump lift system assembly is suspended at a first port of the lower end of the suspended three-way assembly, and a gas-liquid separation system assembly is connected to a second port of the lower end of the suspended three-way assembly through a gas-collection oil tube; the system further includes a flow control valve and a visual control device; the visual control device is connected with the electric-pump lift system assembly, the gas-liquid separation system assembly and the flow control valve. By the adoption of the electric-pump and jet-pump combined lift system, no external high-pressure power liquid is needed, high-pressure liquid-rich flow which flows through the electric pump serves as power liquid to suck separated gas-rich flow, and then the separated gas-rich flow is lifted to a wellhead, so that downhole gas-liquid separated exploitation is achieved. By the adoption of the real-time regulated downhole gas-liquid separation combination lift system capable of being suspended, the application of a conventional electric pump in an oil well with a high gas-liquid ratio is achieved, and the application range of the conventional electric pump in the oil well with the high gas-liquid ratio is broadened.

Description

technical field

[0001] The invention relates to oilfield exploitation technology, in particular to a suspension-type real-time control downhole gas-liquid separation combined lifting system. Background technique

[0002] Offshore oilfields with ultra-high gas-liquid ratio oil wells face low lifting efficiency of conventional electric pump wells, and in severe cases, "air lock" occurs, which greatly reduces lifting efficiency and seriously affects the normal production of oil wells. At present, the commonly used lifting methods are: 1) conventional gas-liquid separator: the effect is significant only when the gas content of the pump suction port is less than 30%; 2) gas separation master: the device can handle the gas content in the range of 30%-50%, When the gas content is larger, the separation efficiency drops significantly. 3) Gas processor: the gas is compressed and dissolved in crude oil through downhole pressurization, and the application effect is better only when th...

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