Research On The Control System Of Oil Extraction Joint Station Based On PLC

Liquid-oil ratio is rising quickly when the oilfield entered the high water-cut stage,and the composite water-cut of Daqing oilfield has reached 92.5%.Lifting costs are too high for the increasing water constantly.When water of producing wells are 98%and more,the wells should be closed because the economic limit requires the production of shut-in,and that will affect the oil yield production.At the same time,as the oil processing volume increased year by year,a large number of produced water is dealt by a long process cycle,resulting in the gathering system energy consumption and surface engineering construction workload increasing.Therefore,how to reduce the produced water to achieve economic extraction of high water-cut wells and decrease oil-gas gathering and transporting system energy consumption have become one of the key problems to keep oil-field high efficiency sustainable development.In this paper,through the research and application of the same well injection-production technology,the separated water is injected into the implanted layer directly when the output liquid is separated for oil-water separation in the well,so oil-water mixture that has higher oil is lifted to the ground,which realizes the synchronization between water injection and oil production.The implementation of this technology,on the one hand,it can control fluid production effectively by reducing oil well produced water in production wells to achieve economic and effective mining when water-cut conditions has achieved high about 98%,prolonging the oilfield development cycle and enhancing oil recovery;on the other hand,it can effectively alleviate the subsequent water treatment pressure,auxiliary water injection,reduce the ground water injection rate,reduce the transportation construction scale and number of surface oil and gas,reduce the ground equipment energy consumption level and the cost of water treatment.At the same time,it also can increase the water layer and water injection well,providing favorable conditions for the relation between perfect injection.Through the research and application of the same wells injection-production technology,the efficiency of downhole oil-water separation is improved by researching and developing the injection and production wells matching process system.It has important significance for improving the implementation of the sustainable development of oilfield and oil recovery.