Measuring and testing – Borehole or drilling – Downhole test
Patent
1979-09-21
1981-05-26
Myracle, Jerry W.
Measuring and testing
Borehole or drilling
Downhole test
7386239, E21B 4700
Patent
active
042690633
ABSTRACT:
An apparatus for measuring the downhole force applied to a cable suspending a well-logging apparatus in a borehole according to the invention is connected between the cable and the well-logging apparatus. An elongated sensitive element has a strain gauge integrally bonded upon it for measuring the downhole force, and the strain gauge includes at least one sputter deposited strain gauge. The apparatus is provided with elements for compensating for pressure and temperature changes in the borehole, wherein an envelope is sealingly disposed about the strain gauge means and is formed to allow the sides of the envelope to deflect inwardly and outwardly from the strain gauge in response to changes in pressure and temperature in the borehole. The envelope is filled with oil.
REFERENCES:
patent: 3327784 (1967-06-01), Pardue
patent: 3402601 (1968-09-01), Heineman
patent: 3497958 (1970-03-01), Gollwitzer
patent: 3567879 (1971-03-01), Dueker et al.
Advertising Brochure: The CEC 1000 Sputtered Gage Pressure Transducer, CEC Division of Bell and Howell, Pasedena, Calif.
Escaron Pierre C.
Hoppe Joachim A.
Myracle Jerry W.
Schlumberger Technology Corporation
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