Downhole gas-liquid separation lifting technology pipe column

Abstract

The invention belongs to the technical field of oilfield exploitation, and discloses a downhole gas-liquid separation lifting technology pipe column. The pipe column comprises a liquid production sleeve, a downhole safety valve, a liquid blocking device, a gas production oil pipe locating joint, a gas production oil pipe, a cable packer, a liquid production oil pipe, a liquid production oil pipe locating joint, a speed gas production oil pipe, a Y joint, an inserting sealing device, a work cylinder, an adjusting cable, a gas course adjusting device, a power cable, an electric pump, a pump operating duty device, a gas-liquid separator and a top packer which are arranged in a production sleeve. Independent gas-phase and liquid-phase flow passages are constructed, the secondary liquid accumulation risk of a gas course passage and the lifting inhibiting influence of liquid-course fluid on gas-course fluid are effectively avoided, three constructed independent flowing passages are providedwith safety containment devices, and the safety of production operation on the sea can be ensured; the downhole gas-liquid separation lifting technology pipe column has the advantages that operation and construction are convenient, the work stability is high, and the amount of treated liquid and gas is large, and can be widely applied to the lifting technology of oil wells of the high gas-liquid ratio and liquid accumulation gas wells of the large water production amount in offshore oilfields.

Description

technical field [0001] The invention relates to the technical field of oilfield exploitation, in particular to a novel downhole gas-liquid separation and lifting process string. Background technique [0002] Offshore oilfields with high gas-liquid ratio oil wells (gas content > 60%) face problems such as low lifting efficiency of conventional electric pump wells, and in severe cases, "gas lock" occurs, which even affects the normal production of oil wells. Offshore gas wells will face wellbore fluid accumulation at different stages of development. When the gas well enters the middle and late stages of production, the gas production of the gas well will decrease, the liquid carrying capacity will decrease, and the fluid accumulation will become more serious. If the necessary drainage measures are not taken in time, the gas well will Flooded to stop production. At present, the commonly used treatment methods include: foam row, velocity column, electric pump lift, gas jet p...

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Problems solved by technology

[0004] The invention aims to solve the technical problems of poor applicability of conventional electric pump wells in oil wells with high / ultra-high gas content and continuous liquid drainage in gas wells with large water production and fluid accumulation, and provides a safe and reliable downhole gas-liquid separation and lifting process string , the process string uses liquid production casing, liquid production tubing, gas production tubing and velocity gas production tubing to establish independent flow channels for gas phase and liquid phase, effectively avoiding the risk of secondary liquid accumulation in the gas channel and the impact of liquid fluid on gas fluid. It has the characteristics of convenient operation and construction, high working stability, large liquid and gas treatment volume, etc. It can be widely used in the lifting process of offshore oilfields with high gas-liquid ratio oil wells and large water production liquid accumulation gas wells

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