| 摘要 |
<p>A tubing conveyed casing collar locator system that detects the casing collars (30) in a wellbore and acoustically transmits the information through the tubing (25) to the surface where it is detected and processed in a surface processor (65). The system comprises a downhole tool (35) which comprises downhole sensors, a signal processor with memory, a drive circuit, a battery pack, and a signal generator. The surface system comprises a surface processor, depth system, and acoustic signal transmitter/receiver. The downhole tool (35) detects casing collars (30) as the tool is moved through the collar and acoustically transmits the data or stores the data in downhole memory according to programmed instructions. In one embodiment, the tool compares sensor signals from production elements, such as valves, to stored sensor signatures to uniquely identify the downhole element. In one embodiment, the downhole tool changes operating modes in response to surface command.</p> |
