Patent ID: 8174404
Filing Date: 2012-05-08
Classification: E21B,G01V

Abstract:
1. A mud pulse telemetry system, comprising: a surface located fluid supply line having a drilling fluid flowing therein; a non-venting pulser disposed in said drilling fluid in said supply line, said non-venting pulser adapted to generate pressure fluctuations in said drilling fluid; a downhole receiver in hydraulic communication with said pulser and adapted to detect said pressure fluctuations in said drilling fluid; a downhole pressure pulser configured to send a signal to a surface location, wherein the non-venting pulser and the downhole pressure pulser perform a signal handshake having an uplink signal and a downlink signal between the surface location and the downhole location; and a processor configured to determine a data reception rate at one of the surface location and the downhole location, compare the determined data reception rate to a predetermined data reception criterion for the one of the surface location and the downhole location, and instruct the other of the surface location and the downhole location to alter an encoding scheme of the at least one of said uplink signal and said downlink signal when the predetermined data reception rate is not achieved.