| 摘要 |
There is provided a data acquisition apparatus for use in a wellbore, having a receiver attached to an elongate electrical connector for conveying signals from downhole to surface, and a plurality of sensing devices adapted to be positioned downhole in spaced apart positions remote from the receiver, so as to form an array of sensing devices. The receiver includes a transmitter so as to allow two-way travel of signals within the wellbore. The invention is particularly of use when acquiring data in near-horizontal wells, or horizontal wells. Data acquired by one sensing device is transmitted to a receiver on a neighboring sensing device for transmittal from the neighboring sensing device to a next neighbour in the array. Data signals are thus relayed along the array of sensing devices until the last sensing device in the array transmits all acquired data to the receiver. The spacing between the individual sensing devices is regular and ranges from 3 meters to 100 meters. There is also provided a method of acquiring signals down a wellbore, comprising the steps of placing a plurality of spaced apart sensing devices within a lower part of the wellbore in the form of an array, and transmitting data acquired by each sensing device to a next one in the array by wireless telemetry.
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