Acoustic logging tools with acoustic attenuating structure

Claim 1

APPARATUS FOR USE IN WELL BORES COPRISING: AN ELONGATED, RIGID TUBULAR MEMBER OF A MATERIAL HAVING A RELATIVELY HIGH CHARACTERISTIC ACOUSTIC VELOCITY; AT LEAST TWO ASCOUSTIC TRANSDUCERS IN A FIXED, SPACED RELATIONSHIP RELATIVE TO ONE ANOTHER ALONG A SECTION OF SAID TUBULAR MEMBER; SAID TUBULAR MEMBER HAVING A CONFIGURATION BETWEEN SAID ACOSTIC TRANSDUCERS ARRANGED TO ALTER THE INTENSITY AND TIME OF ARRIVAL OF DETACHABLE ACOUSTIC ENERGY TRAVELING THROUGH AND LONGITUDINALLY OF SAID TUBULAR MEMBER, SUCH CONFIGURATION INCLUDING INTERRUPTS IN THE LONGITUDINAL CONTTINUITY OF SAID TUBULAR MEMBER TO PROVIDE TORRUOUS ALTERNATIVE PATHS FOR PASSAGE TO ACOUSTIC ENERGY, WHICH PATHS ARE LONGER THAN THE LONGITUDINAL SPACING BETWEEN SAID TRANSDUCERS, AND MATERIAL SECURED TO SAID MEMBER IN SAID INTERRUPTIONS, SAID MATERIAL HAVING A HIGH DENSITY AND LOW MODULUS OF ELASTICITY RELATIVE TO THE MATERIAL OF SAID MEMBER AND BEING ADEQUATE TO CHANGE THE WEIGHT OF THE TUBULAR MEMBER INDEPENDENTLY OF ITS UNIT SPRING RATE AND THEREBY FURTHER ALTER THE INTENSITY AND TIME OF ARRIAVE OF DETACHABLE ACOUSTIC ENERGY.