专利名称：Method and apparatus for investigating
stand-off in a borehole
发明人：Michael P. Ekstrom,R. Mark Havira申请号：US06/361224申请日：19820324公开号：US04692908A公开日：19870908
摘要：An acoustic method and apparatus for investigating an earth formationpenetrated by a borehole are described. Acoustic transducers are mounted on a tool toaccurately determine the distance between a segment of the tool and the wall of theborehole. The acoustic transducers are positioned in such manner that the stand-offdistance between individual resistivity measuring electrodes in an array, which is alsomounted on the tool segment, and the borehole wall can be measured. The stand-offmeasurement is recorded and may be used to correct the electrode resistivity
measurements. In one embodiment a calibration of acoustic transducers as a function ofdepth is obtained by employing acoustic calibrating transducers to compensate forborehole environment effects on the performance of the acoustic transducers as well asdetermine the acoustic velocity of the borehole fluid, such as mud. Several embodimentsare described.
申请人：SCHLUMBERGER-DOLL RESEARCH
代理人：Kenneth Olsen,Louis H. Reens
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