High speed telemetry signal processing
AssigneeGE Energy Oilfield Technology, Inc.
InventorsYihan Jiang, Wilson Chun-Ling Chin
Life of this patent
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Abstract
A drilling system includes a sensor, an encoder operably connected to the sensor and a pressure pulse generator operably connected to the encoder. The pressure pulse generator is configured to produce a primary signal in response to input from the encoder. The drilling system further includes a primary transducer, a reference transducer and a signal processor connected to the primary transducer and the reference transducer. The signal processor includes a two-stage filter that is configured to extract the primary signal from noise observed at the primary transducer.
Claims20
A drilling system including a mud pump comprising:
- a sensor;
- an encoder operably connected to the sensor;
- a pressure pulse generator operably connected to the encoder, wherein the pressure pulse generator is configured to produce a primary signal in response to input from the encoder;
- a primary transducer configured to produce a primary transducer signal in response to a measurement of the primary signal;
- a reference transducer configured to produce a reference transducer signal in response to a reflection of the primary signal off the mud pump;
- and
- a signal processor connected to the primary transducer and the reference transducer, wherein the signal processor comprises a two-stage filter that is configured to extract the primary signal from the primary transducer signal and the reference transducer signal observed at the primary transducer.
A receiver system for use in receiving and decoding a primary pressure pulse signal generated by a measurement-while-drilling (MWD) tool used in a drilling system that includes a mud pump that is a source of pressure pulse signal noise caused by the reflection of the primary pressure pulse signal off of the mud pump, the receiver system comprising:
- a primary transducer, wherein the primary transducer produces an electric signal in response to the measurement of the primary pressure pulse signal and the pressure pulse signal noise caused by the reflection of the primary signal off the mud pump;
- a reference transducer, wherein the reference transducer produces an electric signal in response to the measurement primarily of the pressure pulse signal noise caused by the reflection of the primary signal off the mud pump;
- and
- a signal processor, wherein the signal processor comprises:
- an adaptive filter, wherein the adaptive filter produces a first-filtered electric signal from the electric signals produced by the primary transducer and reference transducer;
- and
- a low pass filter, wherein the low pass filter produces a second-filtered electric signal from the first filtered-electric signal.
A method for processing a primary pressure pulse signal generated by a measurement-while-drilling (MWD) tool used in a drilling system that includes a mud pump that is a source of pressure pulse signal noise caused by the reflection of the primary pressure pulse signal off of the mud pump, the method comprising the steps of:
- producing a reference electric signal, wherein the reference electric signal is produced in response to the measurement primarily of the pressure pulse signal noise caused by the reflection of the primary pressure pulse signal off of the mud pump;
- producing a primary electric signal, wherein the primary electric signal is produced in response to the measurement of the primary pressure pulse signal and the pressure pulse signal noise caused by the reflection of the primary pressure pulse signal off of the mud pump;
- applying an adaptive filter to the reference electric signal and the primary electric signal to produce a first-filtered electric signal;
- applying a low pass filter to the first-filtered electric signal to produce a second-filtered electric signal;
- and
- decoding the primary electric signal from the second-filtered electric signal.
Dependencies are inferred from the claim text.