Gas well gas-liquid separating producing well completion pipe string

Abstract

The invention provides a gas-liquid separating producing pipe string for offshore gas well liquid discharging gas production. A shaft, an immersion pump, a gas production oil pipe and a liquid discharging oil pipe are included, wherein the immersion pump is arranged at the bottom of the shaft, and the gas production oil pipe and the liquid discharging oil pipe are vertically placed in the shaft. Abottom inlet of the liquid discharging oil pipe is connected with a discharging port of the immersion pump. The position of a bottom air inlet of the gas production oil pipe is higher than and away from a liquid inlet of the immersion pump. A double-pipe packer for blocking the shaft is further arranged in the shaft. The gas production oil pipe and the liquid discharging oil pipe communicate witha main channel and an auxiliary channel of the double-pipe packer correspondingly. The character that the specific gravity of liquid is larger than the specific gravity of gas is utilized, the liquidinlet is arranged below a gas inlet, the immersion pump gas-liquid separation function is matched, and the purpose of deep and thorough gas-liquid separation can be achieved. The well completion pipestring is simple in structure and good in effect and has very high usage benefits.

Description

technical field [0001] The invention relates to a gas-liquid separate recovery process technology in the field of oil and gas exploitation, in particular to a gas-liquid separate recovery completion pipe string for a gas well. Background technique [0002] In the process of natural gas production, when the gas well production is lower than the continuous liquid-carrying gas flow rate, the gas well will start to liquid, and the wellbore fluid accumulation of the gas well will increase the back pressure on the gas layer, severely limiting the production capacity of the gas well. For low-pressure gas wells, once the gas well accumulates liquid, the amount of liquid accumulated in the wellbore will continue to increase, which will cause the low-pressure gas well to completely shut down due to water flooding. The method of removing the fluid accumulation at the bottom of the gas well and maintaining the production of the gas well is called drainage and gas recovery. [0003] At ...

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Problems solved by technology

In addition, the patent CN207017952U provides a downhole gas-liquid separation and lifting process string, but the gas-liquid separation system and the canned electric pump oil production system of the process string are located above the packer and cannot be completely discharged below the packer It is difficult to meet the needs of liquid drainage and gas production in low-pressure and large-fluid wells, and the structure of the process string shows that there is only a single flow channel under the packer, and the gas-liquid co-production is not separated

[0009] In view of the problems that offshore gas wells are equipped with downhole packers, the oil and casing are not connected, and the liquid accumulation in gas wells and the water flooding of gas wells are difficult to control, the above-mentioned current technology still has deficiencies.

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