| 摘要 |
The present invention relates to a downhole tool (1) for determining laterals (2) in a borehole wall (3) or a borehole casing, comprising a tool housing (5) extending along a longitudinal axis (6) and having a circumference perpendicular to the longitudinal axis and adapted to be lowered into a well, a plurality of sonic transceivers (7), each sonic transceiver transmitting sonic signals from the housing and receiving sonic signals reflected from the borehole wall or borehole casing in a predefined angular segment, wherein the plurality of sonic transceivers are arranged along the circumference of the tool housing having a mutual distance and are capable of transmitting sonic signals radially away from the tool housing in an entire central angle of 360 degrees towards the borehole wall or borehole casing and wherein, during use, one sonic transceiver, during a pulse time, transmits a sonic signal in the predefined angular segment of that sonic transmitter, and wherein one sonic transceiver, during a subsequent echo time, receives a reflected sonic signal from the borehole wall or borehole casing, and wherein an absence of the received reflected sonic signal, during the subsequent echo time, indicates a lateral. Furthermore, the invention relates to a downhole system and a method of determining a position of a lateral. |
