摘要:
A method and apparatus are provided for estimating the cross-sectional shape and orientation of an earth borehole and the motion of a tool therein. The method and apparatus involve measuring the distance from the tool to the borehole wall at a plurality of locations around the periphery of the tool and fitting those measured distances to a predetermined shape function using a nonlinear parameter estimation technique to minimize the error between the estimated shape of the borehole and the measured distances. The method and apparatus may be used to estimate elliptical and higher order borehole shapes. Additionally, the method and apparatus may be used while drilling the borehole.
摘要:
A method and apparatus for utilizing flexural excitations to characterize and/or image a cased well is disclosed. Various applications of the method and apparatus are also discussed.
摘要:
A light actuated system for use in a wellbore (12,16,18) comprises a light actuated transducer (40) in the wellbore, said light actuated transducer adapted to transform a physical state of a component thereof upon application of optical energy; an optical waveguide (56) conveying the optical energy from a source thereof (46b) to the light actuated transducer; and a control device (46a) in the wellbore operated at least in part by the said change in the physical state of the component of the light actuated transducer.
摘要:
A pressure pulse sensor, and, in particular, a hydrophone, provide enhanced functionality and convenience in detecting pressure pulses. The hydrophone (30) includes a stack (34) of disc-shaped lead titanate piezoelectric crystals (32) enclosed within an epoxy membrane (38) and a mounting portion (44) which is aligned with a center of mass (48) of the crystal stack (34).
摘要:
A borehole logging tool (13) having a dipole acoustic energy source (16) and a plurality of spaced-apart dipole acoustic energy receivers (17) is lowered into a deviated borehole (14) penetrating a subsurface formation. The dipole source (16) and receivers (17) are positioned eccentrically with respect to the borehole axis and are focused in the same direction perpendicular to the axis of the borehole tool as well as perpendicular to the direction of such eccentricity so that received tube wave amplitudes are minimized with respect to received shear wave amplitudes.