Oilfield associated gas recycling and produced sewage treatment device based on aqueous-complex method

Abstract

The invention belongs to the technical field of natural gas hydrate application, and specifically refers to an oilfield associated gas recovery and produced sewage treatment device based on a hydrate method. The device includes: oil-gas-water three-phase separator, gas-liquid-solid three-phase separator, crude oil storage tank, settling tank, condensation tower, filter, sewage tank, gas buffer tank, screw pump, slurry pump, gas-liquid two-phase Phase pumps, compressors, pressure gauges, flow meters, hydrate formation and decomposition units, one-way valves, stop valves, two-phase separators, and water storage tanks. Through the recovery and classification treatment of the device, the produced water can be further treated and reinjected into the oil field, the associated gas is treated in stages, the heavy hydrocarbons are condensed and recovered into the crude oil storage tank, and the methane and ethane gases are purified and reused, thereby realizing sewage treatment and reinjection It is integrated with the recovery and reuse of light hydrocarbons, mutual utilization of energy, saving investment, and high recovery efficiency.

Description

technical field [0001] The invention belongs to the technical field of natural gas hydrate application, and specifically refers to an oilfield associated gas recovery and produced sewage treatment device based on a hydrate method. Background technique [0002] With the continuous development of my country's oilfields and continuous breakthroughs in secondary oil recovery technology, the sewage treatment and recovery of oilfield associated gas have become the key to oilfield development during the production process. There are certain technical difficulties in the process, the treatment cost is relatively high, and there is uncertainty about whether the treated sewage meets the reinjection standard. Therefore, a complete and feasible sewage purification and reinjection process is particularly critical. A certain amount of associated gas will be produced in the process of oil field exploitation, and its main components are methane and ethane. If it is not treated and discharged...

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Problems solved by technology

[0003] The literature "Qiu Kuangwu. Current status and analysis of oilfield associated gas recovery devices [J]. China Petroleum and Chemical Standards and Quality, 2016, (24): 97-98." summarizes the current oilfield associated gas recovery devices, mainly including mobile Type casing gas recovery device, electric heating type casing gas pressure regulation recovery device, skid-mounted recovery device, linkage low-pressure pump recovery device, the above processes require a large number of auxiliary facilities, the investment cost is relatively large, and associated gas cannot be classified and processed Therefore, a safe, reliable, low-investment, recovery process technology that can classify and treat gases has become the key

The literature "Zhang Weifeng. Discussion on the Current Situation and Development Trend of Oilfield Oily Wastewater Treatment [J]. China Petrochemical, 2017, (06): 46-47." pointed out the main methods of oilfield sewage treatment at present, and pointed out their respective advantages and disadvantages, among which ultrasonic Treatment method: the separation effect is good, but it is difficult to form a scale, and the equipment is expensive; flotation treatment method: the technology is relatively mature, but the consumption of medicines is relatively large, and proofreading scum is generated; coarse-grained method: the treatment equipment is simple to operate and occupies an area Small size, easy to block when used for a long time, surfactant affects the effect of the instrument; gravity separation method: the technology is relatively mature, the instrument is stable, and can be processed in large quantities, but the disadvantage is that it occupies a large area; the cost of the filtration method is low, and the water quality after treatment is good. The filter equipment should be cleaned regularly; membrane separation method: the equipment is simple, the water quality is good after treatment, the disadvantage is that the membrane is not easy to clean, and the cost of use and maintenance is high

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