Zero sum pressure drop mud telemetry modulator

摘要

A method and arrangement for mud telemetry having components of a wellbore casing, a combination rotor stator positioned inside the wellbore casing, an uphole detection arrangement configured to sense increases and decreases in pressure, a valve actuator, a valve configured to be actuated by the valve actuator, the valve configured to convey a fluid from an inside of the wellbore casing to an outside of the wellbore casing and cause a decrease in fluid pressure in the wellbore casing, and a downhole tool configured to measure at least one formation parameter.

主权项

1. A telemetry system comprising:
at least one drill pipe; a combination rotor/stator positioned inside the at least one drill pipe, the combination rotor/stator configured to cause an increase in fluid pressure in a fluid with respect to a reference pressure value by impeding a flow of the fluid to a downhole environment; a valve actuator; a valve connected to the valve actuator, the valve configured to be actuated by the valve actuator, the valve configured to convey the fluid from an inside of the drill pipe to an annulus and cause a reduction in fluid pressure in the fluid with respect to the reference pressure value; a control module configured to receive data from a downhole component and act upon the combination rotor/stator and the valve actuator so the increase in fluid pressure and the reduction in fluid pressure form a sinusoidal waveform having a positive component corresponding to the increase in fluid pressure and a negative component corresponding to the reduction in fluid pressure; and an uphole detector configured to measure the sinusoidal waveform by detecting increases and reductions in the pressure of the fluid acted upon by the combination rotor/stator and the valve.