Importance

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Abstract

A .gamma.-ray tool and acoustic logging instrument combination includes in an elongated housing a transmitter for sound and at least one and preferably two, sound sensors located at predetermined distances above the transmitter. The sound sensors are separated from the sound transmitter by a steel tube that has a layer of lead bonded onto its exterior surface and has electronic components of the instrument placed into its interior. The portion of the housing that surrounds the lead bonded steel tube consists of fiberglass, polytetrafluoroethylene (TEFLON.RTM.) or other material which does not conduct sound whereby the lead-bonded tube and the immediate housing around it act as a sound isolator bar. The transmitter and the sound sensors are surrounded by portions of the housing that comprises slotted steel to allow free flow of acoustic energy through these portions of the housing. The .gamma.-ray detector is enclosed in the housing, preferably above the sound sensors at a portion of the steel pipe not having a layer of lead around its circumference. Because of the placement of electronic components into the interior of the isolator bar and through the sensors and transducers themselves, the overall length of the instrument is reduced to approximately 81/2 feet or less not including the length of a centralizer nor of a case collar locator that is usually attached to the instrument combination.

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First Claim