遥测三相流产出剖面组合测井仪

A Digital Combined Tool for Telemetry Three-phase-flow Production Profile Logging.

介绍一种过环空三相流多参数组合测井仪。通过采用单相流计量仪的涡轮流量计测量体积流量 ,其流动回路实验结果表明 ,涡轮仪表常数 k与流动密度ρn之间存在线性关系。传感器的测量原理是利用1 0 9Cd放射源发射的γ和 X射线分别确定三相平均密度和持水率 ,针对不同的配比流动密度和含气率分别作出持水率与实配含水率及流量的关系图版。井温和井下压力的测量分别采用铂电阻传感器和应变传感器测量。根据测得的涡轮转数、密度、持水率、井温和压力等参数计算三相总流量、流动密度、含水率、含油率、含气率等 ,进而得到油、气、水三相的分相流量 ,最后得到三相产出剖面成果。经大庆油田现场 10井次试验获得的三相产出剖面测井资料证明 ,其仪器的测量重复性好 ,测量值与井口计量符合较好 。

During the later stage of oilfield development, there usually exits three phase flows in pumping wells. Therefore, it is important to improve and generalize the technology of three phase flow production profile logging. A new through annulus telemetry three phase flow multi parameter combined tool is introduced in this paper. A single phase spinner flowmeter is used for measuring the volume flows. Flow return experiments indicate that the costant k of the flowmeter is a function of flow density ρ n. The measuring principle of the sensor is to determine the three phase flow average density and water holdup by γ ray and X ray strength radiated from 109 Cd source. The cross plot between water holdup, actural proportioning water holdup and flow volume is given in Fig.7 according to different proportioning flow density and water holdup. Well temperature is measured with platinum resistance sensor while the downhole pressure with the strain sensor. Based on such measured parameters as spinner revolutions, density, water holdup, well temperature, downhole pressure, etc., the total three phase flow volumes, flow density, water holdup, oil holdup and gas holdup have been obtained simultaneously, and finally, the oil phase, gas phase and water phase have been determined respectively. The three phase flow production profile log data from 10 logging runs in Daqing Oilfield show this new combined tool may meet the needs of the production profile logging in medium deep wells.