Skid-mounted carbon-dioxide-flooding flow-back gas desulfurization, dehydration and carbon dioxide recovery system

Abstract

The invention provides a skid-mounted carbon-dioxide-flooding flow-back gas desulfurization, dehydration and carbon dioxide recovery system. The skid-mounted carbon-dioxide-flooding flow-back gas desulfurization, dehydration and carbon dioxide recovery system comprises a flow-back gas pretreatment and desulfurization skid-mounted device, a cold drying skid-mounted device, a compressor film feedingskid-mounted device, a film separation skid-mounted device and a carbon dioxide pressurization and reinjection skid-mounted device, wherein the cold drying skid-mounted device communicates with the flow-back gas pretreatment and desulfurization skid-mounted device; the compressor film feeding skid-mounted device communicates with the cold drying skid-mounted device; the film separation skid-mounted device communicates with the compressor film feeding skid-mounted device; and the carbon dioxide pressurization and reinjection skid-mounted device communicates with the film separation skid-mounted device. According to the invention, flow-back gas enters the flow-back gas pretreatment and desulfurization skid-mounted device for pretreatment and desulfurization; obtained backflow gas then enters the cold drying skid-mounted device for dehydration treatment; dehydrated flow-back gas enters the compressor film feeding skid-mounted device for pressurization treatment; and pressurized flow-backgas enters the film separation skid-mounted device for gas separation. The skid-mounted carbon-dioxide-flooding flow-back gas desulfurization, dehydration and carbon dioxide recovery system providedby the invention has skid-mounted design, is convenient to install and operate, and facilitates treating flow-back gas with small amount.

Description

technical field [0001] The invention relates to the field of carbon dioxide recovery, in particular to a skid-mounted carbon dioxide drive back exhaust gas desulfurization dehydration and carbon dioxide recovery system. Background technique [0002] With the large-scale promotion of carbon dioxide flooding tertiary oil recovery technology, the surface technology of carbon dioxide flooding production fluid is facing some difficulties: after carbon dioxide is injected into the ground, about 50% to 60% will be permanently sealed underground, and the remaining 40% to 50% Then the gas overflows with the backflow of the oilfield produced fluid. Since the flowback gas of the CO2 flooding production fluid contains more CO 2 , the return gas of the CO2 flooding production fluid cannot enter the gathering pipeline network or be ignited without necessary treatment, and can only be discharged directly, which not only pollutes the environment, but also wastes natural gas and CO 2 resou...

AI Technical Summary

Problems solved by technology

[0003] For single well CO 2 In oil flooding projects, the amount of back gas in the produced fluid is small, and the traditional amine method for desulfurization and decarbonization requires large investment, high operating costs, and is uneconomical

Images