Two-stage axial-flow type online gas-liquid separation device for underwater pipeline

Abstract

The invention provides an online gas-liquid separation device for an underwater pipeline, and applies to efficient gas separation of well flow of an underwater production system. The gas-liquid separation device realizes online installation and operation of the pipeline and has the characteristics of simplifying of oil and gas gathering and transferring processes, reduction of gathering and transferring energy consumption and compact structure; a uniform gas-liquid mixing device adopts layered screw blades in opposite rotating directions to crush big bubbles to form uniform gas-liquid mixing flow, so that the gas-liquid ratio adaption range of the device is broad; a first-stage axial flow device adopts a single vertical cylinder to implement first-stage vertical high-speed swirling flow gas-liquid separation to remove most liquid phase, a second-stage axial flow device adopts double horizontal cylinders to implement second-stage horizontal layered rotating flow gas-liquid separation to remove the residual liquid flow, and efficient separation of the two-phase well flow is realized; a scrubbing balancer adopts double vertical cylinders to realize buffer pressure stabilization and complete separation of the gas-phase well flow, and a cleaning pipe performs cleaning operation automatically; a gas-liquid separation control system implements remote automatic control so as to control the well flow of the submarine pipeline and realize dynamic balance of pressure of the scrubbing balancer.

Description

technical field [0001] The invention relates to a separation device for gas-liquid two-phase well flow in an underwater production system, in particular to a two-stage axial-flow high-efficiency gas separation device and a process flow thereof on-line for a submarine pipeline. Background technique [0002] The development of offshore oilfields, especially the floating platforms used in deepwater oil and gas fields, is greatly affected by the size and weight of oil, gas and water treatment equipment. However, the current oil and gas gathering and transportation process on offshore platforms is relatively complicated, and the oil, gas and water treatment equipment in the gathering and transportation process mainly relies on traditional gravity settlement. The equipment size and operating weight are relatively large, and the processing efficiency is low, which greatly increases the The cost of deepwater floating platforms directly affects the effective development of offshore o...

AI Technical Summary

Problems solved by technology

However, the current oil and gas gathering and transportation process on offshore platforms is relatively complicated, and the oil, gas and water treatment equipment in the gathering and transportation process mainly relies on traditional gravity settlement. The equipment size and operating weight are relatively large, and the processing efficiency is low, which greatly increases the The cost of deepwater floating platforms directly affects the effective development of offshore oil and gas fields

[0003] At present, offshore oil and gas gathering and transportation at home and abroad usually adopt "oil and gas field high-pressure well flow → riser → high-pressure three-phase separator → low-pressure three-phase separator → electric dehydration booster pump → electric dehydrator → export pump → submarine pipeline" In the high and low pressure separator, the gravity and natural sedimentation of water particles are mainly used to separate the gas and liquid, and then into the electric dehydrator, and then the high voltage electric field is used to demulsify the crude oil, so that the water in the oil is further separated and settled. The whole process is bulky , and the oil-water separation efficiency is low; in addition, after the high-pressure well flow is transported through the vertical standpipe and the gas-liquid separation of the separator, the energy loss is serious, and the flow pressure drops greatly. It is necessary to add an electric dehydration booster pump and an external delivery pump The subsea pipeline transportation requirements can only be met after the well flow is pressurized separately, which makes the operation of the entire gathering and transportation process high energy consumption and unstable work

The compact oil-gas-water separation equipment adopts the parallel connection technology of hydrocyclone and single cyclone tube on the offshore platform to reduce the space occupied by the separation equipment and reduce the weight at the same time, such as the degasser and dehydrator developed by FMC Technologies in the United States. However, domestic research on compact and efficient oil-gas-water separation technology is still in the experimental stage.

In addition, research on oil-gas-water separation equipment for underwater production systems is still in its infancy at home and abroad.

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