초록 ▼

An acoustic transmission system is presented, wherein acoustic communication is transmitted over an acoustic medium comprising production tubing, well casing or over continuous tubing in a well (e.g., coil tubing, chemical injection tubing or dewatering string). More specifically, the acoustic mediu

An acoustic transmission system is presented, wherein acoustic communication is transmitted over an acoustic medium comprising production tubing, well casing or over continuous tubing in a well (e.g., coil tubing, chemical injection tubing or dewatering string). More specifically, the acoustic medium has an acoustic tool associated therewith, which is permanently located downhole with the sensors and electromechanical devices typically employed in a well, and an acoustic tool associated therewith uphole. The downhole sensors are connected to the downhole acoustic tool for acoustic communication. The acoustic tool includes a piezoelectric ceramic transducer (i.e., a stack of piezoelectric elements) or an accelerometer for transmitting or receiving acoustic signals transmitting through the medium.

대표청구항 ▼

1. In a production well for producing petroleum fluids, the production well including production tubing running from the surface downhole to a production zone, the improvement comprising:a downhole acoustic communications device permanently deployed downhole for transmitting or receiving acoustic si

1. In a production well for producing petroleum fluids, the production well including production tubing running from the surface downhole to a production zone, the improvement comprising:a downhole acoustic communications device permanently deployed downhole for transmitting or receiving acoustic signals using a plurality of longitudinal elements in a production well as the transmission medium, said acoustic signal being transmitted using a broadband communications technique wherein information to be transmitted is transmitted using a presence and an absence of a sweep of selected frequencies over a period of time which creates a digital bit=1 and a digital bit=0, respectively.