威德福公司推出業(yè)內(nèi)首個外徑為61 mm(2.4 in)且具有取樣功能的過油管小直徑電纜地層測試器MFTD(Compact formation pressure tester)。該儀器一次下井可采集3個儲層流體PVT(pressure-volume-temperature)樣品,用以確定地層壓力、滲透率以及識別油水界面。該儀器適用井眼尺寸最小可至76 mm(3 in),最大可達356 mm(14 in),適用于常規(guī)電纜傳輸測井、過油管測井、撓性管傳輸測井、泵送式過鉆桿測井等多種測井模式。當井眼尺寸不超過6.5 in時,與外徑為5 in的常規(guī)電纜地層測試器相比,MFTD與井壁之間的間隙增加了1倍以上;該儀器在井下采集地層流體PVT樣品能極大地降低井下儀器粘卡的風險、提高作業(yè)效率。

該儀器地層壓力測試模塊MFT(Formation Pressure Tester)的最大預采樣室容積為40 cm3,極板打開后,可以重復測壓,抽吸速率最高為1 cm3/s。石英壓力計提供精確的壓力值,而應變壓力計作為備用,提高了壓力測量的可靠性。在流體測量模塊MFM(Fluid Measurement Section)中配置了電阻率傳感器、電容傳感器和取樣筒壓力計,測量數(shù)據(jù)可用于識別水基泥漿的流體類型、實時監(jiān)測地原狀地層流體和樣品質量。

(信息來源: [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. 楊興琴 編譯 趙舒平 審校)