Technology Study Of Crude Oil Gathering And Processing In Ultrahigh Water Cut Stage Of North Saertu Oilfield

North Saertu oilfield development construction experienced the first infilled adjustment, the second infilled adjustment and the third infilled adjustment. Since low contained water and low temperature of oil well production fluid , high viscosity, high freezing point and high contenting wax of crude oil, and the geographical position in cold region, it was more difficult in gathering and transporting crude oil at that time.In order to guarantee the normal gathering and transporting crude oil, we adopted the conventional blending process of double-tube mixing hot water thermal insulation and hot water washing well and clearing wax.As North Saertu oilfield Pizza have entered high water late development period now, oil production fluid comprehensive water content has reached more than 90%.The water content of production fluid is rising, the water production amount of oil well is rising, the gas and electricity consumption of gathering and transporting system is the increasing trend, and the heat capacity of water is higher than the heat capacity of crude oil. These cause that the energy consumption of double-tube blending and oiling process is increasing. At the same time, as the hydraulic characteristics and emulsion properties of production fluid changed, and its technology boundary, such as temperature and amount of water blending, changed too, it must cause a waste of energy if we run the mode of oil according to the original gathering and transporting technology boundary. In order to control the gathering and transporting energy consumption and reduce production cost, it is very necessary that we research low temperature gathering and transporting technology boundaries and applicat them in production.This paper studied the gathering and transporting characteristic of North Saertu oilfield high water crude oil, developed a series of indoor and field researches, made some achievements in optimizing gathering and transporting technology and reducing the energy consumption of gathering and transporting, got an operation mode of low temperature oil and gas gathering and transporting process from well-head to metering station , transfer station and joint station, and found the operation parameters and boundary for every system in the low temperature operation conditions and supporting technology for every system in the low temperature operation conditions. These can provides technical references for future large-scale promotion in oil field and for planning and designing in new oil field development process. The research results effectively reduce the production consumption rising trend of oilfield. By the end of 2009, there were about 3,000 operating oil Wells in North Saertu oilfield, and we realized that all oil Wells were blended the normal water and blending furnace were stopped in summer, and we realized that all oil Wells were blended the low temperature water and the amount of operating blending furnace reduced about two-thirds in winter. The heating and processing temperature of oil and gas gathering transporting system production decreased greatly. By energy consumption reduction, we have achieved good economic benefit and social benefit.