具有取样功能的过油管小直径电缆地层测试器

威德福公司推出业内首个外径为61 mm(2.4 in)且具有取样功能的过油管小直径电缆地层测试器MFTD(Compact formation pressure tester)。该仪器一次下井可采集3个储层流体PVT(pressure-volume-temperature)样品,用以确定地层压力、渗透率以及识别油水界面。该仪器适用井眼尺寸最小可至76 mm(3 in),最大可达356 mm(14 in),适用于常规电缆传输测井、过油管测井、挠性管传输测井、泵送式过钻杆测井等多种测井模式。当井眼尺寸不超过6.5 in时,与外径为5 in的常规电缆地层测试器相比,MFTD与井壁之间的间隙增加了1倍以上;该仪器在井下采集地层流体PVT样品能极大地降低井下仪器粘卡的风险、提高作业效率。

该仪器地层压力测试模块MFT(Formation Pressure Tester)的最大预采样室容积为40 cm3,极板打开后,可以重复测压,抽吸速率最高为1 cm3/s。石英压力计提供精确的压力值,而应变压力计作为备用,提高了压力测量的可靠性。在流体测量模块MFM(Fluid Measurement Section)中配置了电阻率传感器、电容传感器和取样筒压力计,测量数据可用于识别水基泥浆的流体类型、实时监测地原状地层流体和样品质量。

(信息来源: [1] Weatherford. Compact Formation Tester First in the World to Collect PVT Samples Through 3.5 in Tubulars [EB/OL].[2017-03-07]. http:∥www.weatherford.com/doc/wft310740. [2] Weatherford. Collects Pressure, Volume, and Temperature Fluid Samples in Challenging Wellbores and Through Pipe [EB/OL].[2017-03-01] http:∥www.weatherford.com/en/products-services/drilling-formation-evaluation/wireline-services/openhole-wireline/fluid-characterization-and-sampling/compact-formation-pressure-tester-with-sampling. 杨兴琴 编译 赵舒平 审校)