A new measuring method of oil-water-gas three phase flowrate by using of heat transfer and fluid dynamics

摘要

It is so difficult to measure individual flowrates of oil-water-gas three phase on-line that very few real three phase flowmeters have been developed in the world. Ibis paper presents a new measuring method of oil-water-gas three phase flowrate by using of heat transfer and fluid dynamics. A cylindrical cyclone is used to separating the most of natural gas from oil-water-gas three phase mixture. A flow mixer is used to homogenize oil and gas flow in a short distance for measurement of bulk flow velocity. A venture-tube is used to measure overall flowrate of three phase mixture. An inverse-U tube is used to measure gas fraction. The heat transfer way is used to measure water fraction. No radiation method is used. So this kind of flowmeter is much more safety, and has much more accuracy. Many room and field experiments have been done. The test results done by the Test Institute of Petroleum Industry of Daqing Oil Field Construction & Design Research Institute were quite well. This kind of three phase flowmeter has been widely used in many oil fields.