| 摘要 |
A pulse-wave ultrasound production well tubing wireline logging method using a logging tool communicating via a wireline to a surface read-out unit, said logging tool provided with a frustoconical ring-shaped linear ultrasound transducer array comprising ultrasound transducer elements, the tool arranged for switching between a PW echo backscatter imaging processing mode and a Doppler measurement processing mode, for transmitting, generating a number of digital signals, and beam-forming said signals to represent ultrasound beams, converting said digital signals to voltage signals, connecting the voltage drive signal channels to oppositely directed consecutive series of said transducer elements, and transmitting wave pulses as said two opposite ultrasound beams (A) and (B) to the fluid in the tubing; and for receiving, receiving returning signals and converting to analogue voltage signals, amplifying the voltage signals, converting them to digital signals and beamforming them, and combining the digital signals to a received digitized ultrasound time signal series for each ultrasound beam (A) and (B), in said PW backscatter mode, forming a an ultrasound image data for beams (A) and (B), in said Doppler mode, producing Doppler measurements for said focused point for each beams (A) and (B) sending images and Doppler measurement to the surface read-out unit. |
