Resourceful Treatment Of Produced Water From Chunfeng Oilfield By A Thermal-mechanical Compression Vaporation Method

This thesis is to develop a thermal-mechanical compression vaporation recycling technology that would achieve innovation and localization of waste water treatment in high temperature and hypersaline oil field, taking Chunfeng oil field in Xinjiang as the study subject where thermal recovery for heavy oil is facing conflict between excessive produced water and insufficient clean water, by exploiting energy configuration of rich coal resources and cheap industrial electricity in this oil field and high thermal energy and salt of produced water from thermal recovery and separated water from steam injection boiler.Thermal-mechanical compression vaporation process is numerical stimulated By building mathematical model. The quality of produced water by using thermal-mechanical compression vaporation technology can satisfy the inlet requirement of ion exchanger in steam injection boiler system. Water cut is about 80%; utilization rate of separated water from boiler is 100%; which if estimated by water production scale of 5000m3/d, the power consumption cost is 10.19 CNY per ton, which is 26% less than mechanical compression and evaporation process. Furthermore, the operation cost of water is 10.75 CNY per ton, almost equal to foreign mechanical compression and evaporation process, while the project investment is about 38% less than the foreign one.This thesis optimizes the physical pretreatment and the high temperature scale inhibitor evaporation technique, that achieved purification and anti-scaling before desalination of high salty and hig hardness water by "non chemical precipitation", which effectively reduce the discharge of solid waste。The field study of this thesis is on 601 terminal and steam injection station in the north section of 601. The study fully utilized residual thermal energy of heavy oil waste water from terminal and separated water from boiler. The application of this technology in Chunfeng oilfield resulted in considerable saving of 12.14 CNY per ton in invalid recycle, clean water, and boiling water, which is comparable to only 6-7 CNY per ton of waste water recycling and utilization cost based on current production cost. It is of great significance in energy conservation and environmental protection.