Underwater three-phase multi-stage gravity type separation injection-production system

Abstract

The invention discloses an underwater three-phase multi-stage gravity type separation injection-production system, and belongs to the field of offshore oil and gas development. The separation injection-production system comprises an integral support structure, a three-stage column type gas-liquid cyclone separator and a supporting support thereof, a horizontal three-phase gravity separator and a supporting support thereof, three groups of pressurizing delivery pumps, a transition liquid storage tank, and corresponding connecting pipelines. The three-stage column type gas-liquid cyclone separator, the supporting support of the three-stage column type gas-liquid cyclone separator, the horizontal three-phase gravity separator, the supporting support of the horizontal three-phase gravity separator, the three groups of pressurizing delivery pumps and the transition liquid storage tank are all positioned in an integral support structure and are connected through the corresponding pipelines to form the three-phase multi-stage separation injection-production system. Produced liquid of a production well can directly pass through a seabed to realize three-phase separation, so that the produced liquid is prevented from being lifted to an offshore platform to be separated, unnecessary energy consumption is reduced, precious platform area is saved for the offshore platform, static pressure of a vertical pipe and back pressure of a wellhead are reduced, oil and gas exploitation efficiency and stability are improved, and production cost is reduced.

Description

technical field [0001] The invention belongs to the field of offshore oil and gas development, and in particular relates to an underwater three-phase multi-stage gravity separation injection-production system. Background technique [0002] In the initial offshore oil and gas exploration and development process, the produced products of subsea oil wells are transported to offshore platforms or shore-based facilities through long-distance pipelines, followed by subsequent oil, gas and water separation treatment, and then onshore transportation, from comprehensive benefits On the one hand, it is more efficient than building an underwater production system. However, as the mining time increases and the mining intensity increases, the water content of the deep-sea produced liquid will also increase accordingly. Long-distance transportation and re-injection will generate a lot of energy consumption and increase production costs. High pressure can also have a serious impact on the...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem of underwater separation currently faced by offshore oilfield exploitation, the present invention provides an underwater three-phase multi-stage gravity separation injection-production system, which can directly perform oil-gas-water separation of the production fluid produced by the production well on the seabed. three-phase separation

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