A safety system for use with an apparatus lowered into a well includes a power supply and a controller that monitors at least a predefined condition of the apparatus. A switch blocks power from the apparatus until the predefined condition is present. A test system includes a test device that generates a signal having a predetermined characteristic (a certain frequency, for example). A controller detects the signal and enables performance of a test operation when the signal of the predetermined frequency is present.
申请公布号
US6148263(A)
申请公布日期
2000.11.14
申请号
US19980179511
申请日期
1998.10.27
申请人
SCHLUMBERGER TECHNOLOGY CORPORATION
发明人
BROOKS, JAMES E.;LERCHE, NOLAN C.;ROBERTSON, GERALD W.;TIMMONS, MICHAEL L.