Parameter Limit Determination for Crude-oil Low-temperature Gathering in Xingbei Development Area at Extra-high Water Cut Stage

A device is set up for testing flow type of produced fluids,the mixture of oil,gas and water produced in the wells at the high water cut stage in Xingbei Development Area is used as a medium to test the flowing conditions of pressure drawdown and the mixture under different temperatures,different water cuts,different fluid productions and different gas contents.The result shows that under the conditions of water cut being over 85%,fluid production rate being 24.41~77.55m~3/d,water content being 78.2%~93.6%,gas-oil ratio being 30~255m~3/t,gas reduced velocity being 0.5~4m/s,the flow pattern of oil,gas and water is impact type,water flow type is divided into 4 types,the limited temperature of 25℃ for the safety mixing gathering of oil,gas and water is lower than pour point.