MUD PULSE TELEMETRY SYSTEMS AND METHODS USING RECEIVE ARRAY PROCESSING

摘要

Mud pulse telemetry systems and methods may employ a downhole pulser to encode a digital telemetry data stream as pressure fluctuations in a fluid flow stream. An arrangement of spatially separated sensors acquire pressure-responsive measurements at multiple positions within the plumbing of a drill rig. A receiver collects and digitizes the measurements from the spatially separated sensors and subjects them to a principal components analysis (PCA) to determine those one or more basis vectors associated the telemetry signal. The PCA process may employ decomposition of a spatial correlation/covariance matrix or a temporal-spatial correlation/ covariance tensor. The selected basis vector(s) are then used to obtain the telemetry signal for demodulation into the telemetry data stream.

主权项

1. A mud pulse telemetry system comprising:
a pulser that transmits a digital data stream as pressure modulations of a flow stream; a plurality of spatially separated sensors each responding to pressure modulations of the flow stream; and a receiver that processes digitized signals from the plurality of sensors to determine a principal component basis vector associated with said pressure modulations from the pulser, wherein the receiver further employs said principal component basis vector to extract the digital data stream.