초록 ▼

A multi-part logging tool that allows measurement of several distinct independent parameters, which are in turn used to solve for secondary parameters that give information about the properties of the cement outside the casing. Secondary parameters affecting the measured signals are: casing thicknes

A multi-part logging tool that allows measurement of several distinct independent parameters, which are in turn used to solve for secondary parameters that give information about the properties of the cement outside the casing. Secondary parameters affecting the measured signals are: casing thickness, bond of cement to casing, cement acoustic impedance, cement thickness, channel size and channel material. The present invention comprises a rotating tool that supports a plurality of specifically configured transducers that interrogate a region behind casing having a 10 degree azimuthal resolution and a depth of investigation of at least 0.75 inches behind casing. The transducers on the rotating tool include an array of angled beam transducers, a single-housing pitch-catch transducer and a radial, pulse echo transducer.

대표청구항 ▼

[ What is claimed is:] [1.] A tool for evaluating the quality of a cement seal in an annulus between a casing and a wellbore, comprising:a tool body having a longitudinal axis;a first transducer mounted on the tool body and oriented perpendicular to said axis;second and third transducers mounted on

[ What is claimed is:] [1.] A tool for evaluating the quality of a cement seal in an annulus between a casing and a wellbore, comprising:a tool body having a longitudinal axis;a first transducer mounted on the tool body and oriented perpendicular to said axis;second and third transducers mounted on the tool body and longitudinally spaced apart from said first transducer, said second and third transducers having faces being inclined toward said first transducer between approximately 8 and 27 degrees with respect to said tool axis;fourth and fifth transducers mounted on the tool body and longitudinally spaced apart from said first through third transducers, said fourth and fifth transducers having faces being inclined toward said first transducer between approximately 8 and 27 degrees with respect to said tool axis;a sixth transducer mounted on said tool body and oriented perpendicular to said axis.