| 摘要 |
1. A method for determining a position of a tool in a fluid transmission line comprising: (a) providing a radio frequency transmitter and a radio frequency receiver on the tool; (b) providing a plurality of radio identification devices in the line at predetermined intervals there along, each device configured to receive a first signal from the transmitter and to transmit a unique second signal responsive to reception of the first signal; (c) moving the tool in the line past the devices as the transmitter transmits the first signal to the devices and the receiver receives second signals from the devices; and (d) locating the tool in the line using the second signals. 2. The method of claim 1 wherein the line comprises a plurality of joints and the radio identification devices are attached to the joints. 3. The method of claim 1 wherein the line comprises a well and the devices are located at known depths in the well. 4. The method of claim 1 comprising providing a log of the line, providing a computer with data from the log, transmitting the second signals to the computer during the moving step, and using the computer to perform the locating step and further perforating the line using information from the locating step. 5. An apparatus for determining position in a fluid line comprising: (a) a tool configured for moving through the line, the tool comprising a radio frequency transceiver; and (b) a plurality of radio identification devices in the line at known locations there along, each device configured to receive a first signal from the transceiver and to transmit a unique second signal to the transceiver as the tool passes in proximity to the device. 6 The apparatus of claim 5 wherein the line comprises a subterranean well. 7. The apparatus of claim 5 further comprising a computer configured to receive unique second signals from the devices and to quantify the position of the tool in the line. 8. The apparatus of claim 5 wherein the line comprises a plurality of couplings and the devices are on the couplings. |
