The Flow Pattern And Pressure Drop Testing Research For Oil-gas-water During Oil Producing With Supper High Water-Cut

With the deeply oil-field exploration, it mainly adopts affusion oil extraction for the 19land oil regions except Sichuan. Until 1997, the compositive water-cut achieves 82.5%and ithas already on high-watery(water-cut>75%). The watercut has exceeded 85% for Daqing oilfield, Shengli oil field, Dagang oil field, Zhongyuan oil field, Henan oil field and Jianghan oilfield etc., it means they has entered super-high water-cut period. No mater in rock holeunderground or well and pipeline on ground, there is oil-gas-water multiphase flow. Ususlly,the pipeline net investment occupies 1/3 in the total ground investment, transportation energyconsumption occupies 2/5 in the total consumption. So research in the mixture flow regulationin pipeline net is important during economical designation and operation, especially predictingthe flow pattern and pressure drop. Because the oil-water emulsification degree changesexquisitly with the water-cut, oil viscidity, convert liquid velocity, then the hydraulic/thermodynamic character of oil-gas-water mixture transportation pipeline change obviously, sothere is no common conclusion until now, there are still many works to do.A set of experimental devices that use the oil-gas-water mixture produced by oil fields asthe medium are developed. Making use of the device and pipeline, the oil-gas-water pipelinepressure drop and temperature drop are tested under different temperature, water-cut, liquidproduction ouput and gas production output. We also screen the gas-liquid two-phase flow andthree-phase flow pattern under different temperature, water-cut, liquid production ouput andgas production output. Provide several overseas flow pattern chart, pressure drop model andrepresentative correlate parameter calculation method. Through the contrasting between theoryand pritical, we make a conclusion that existing gas-liquid flow pattern chart and hydraulicscalculation method are not fit for the super-high watercut. Modify the flow pattern chart andpressure drop calculation model according to testing data, provide the pattern and hydraulicscalculation that fit for the oil-gas-water three-phase flow during super high water-cut.