A Brief Discussion on Direct-Fed Heat Pump Technology for Produced Water in the Pro-cess of Oilfield Waste Heat Utilization
The application of heat pump technology can effectively recover the heat energy of the produced water in the oilfield,and the produced water directly into the heat pump eliminates the intermediate heat exchange system,simplifies the process,and improves the energy efficiency of the heat pump unit.It is an important new process in the produced water waste heat utilization technology,which saves investment,energy,and reduces consumption.In the past application process,due to the poor heat exchange medium,immature technology of produced water directly into the heat pump,imperfect management and other reasons,the heat pump corrosion scale was serious,the heating effect was poor,which could not meet the on-site heating demand.Therefore,a special study on oil-bearing sewage directly into the heat pump technology is carried out to improve the mechanical performance of the heat pump.The double evaporator is used to increase the heat exchange area,the tube type heat exchange tube is used to reduce the inner wall deposition of the heat pump heat exchange tube,and the multi-stage compression technology of the double compressor is used to achieve efficient operation within a large load range of 20%to 100%.Through carrying out rubber ball online cleaning,chemical cleaning,manual cleaning and other tests to determine the cleaning method,intensity,cleaning cycle,and applicable conditions of different safeguard measures.Under complex medium conditions,the energy efficiency COP of the heat pump unit reaches 3.4%～4.85%,and the desilting and descaling cycle of the heat pump unit is extended to more than one year.The technology has been applied in four demonstration projects,and achieved high efficiency heat extraction by direct injection of sewage into heat pump under the condition of deep sewage and polymer-containing sewage,obtained better energy saving and social benefits,provided a basis for the planning and design of waste heat utilization,and also provided technical support for further large-scale promotion and application of the technology.
oilfield produced waterwaste heat utilizationdirectly into heat pumponline cleaningenergy saving
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