Systems and Methods for Double Data Rate Communication Via Power Cable

摘要

Systems and methods for communicating messages over a three-phase power cable between surface equipment and downhole equipment in a well. A transmitter parses messages into data bit pairs and generates a parity bit for each pair (a triplet). The bits of each triplet are concurrently but separately transmitted over the power cable. Each triplet is received from the power cable by a receiver and is decoded to identify the data bits. The receiver may verify the received bits and/or recover a lost bit in each triplet. The data bits are then reconstructed into the original message. Since each triplet has two bits, the effective data rate is twice the data rate of transmitting a single bit at a time. The parity bit enables recovery of data with a bit error rate of up to 1 in 3.

主权项

1. A system for communicating comms on power messages between surface equipment and downhole equipment in a well, the system comprising:
surface equipment positioned at the surface of a well; downhole equipment positioned downhole in the well; a power cable coupled between the surface equipment and the downhole equipment,
wherein the power cable has three conductors configured to transmit three-phase power from the surface equipment to the downhole equipment; at least one transmitter configured to
parse a comms on power message into one or more data bit pairs,generate a parity bit for each of the one or more data bit pairs, thereby forming a triplet, andfor each of the triplets, concurrently transmit the bits of the triplet over the power cable, wherein each of the bits are transmitted on separate conductors of the power cable; at least one receiver configured to
for each of the transmitted triplets, decode the triplet and thereby identify the data bits of the triplet, andreconstruct the data bits of one or more triplets into the comms on power message.