Estimation of properties of mud
AssigneeBaker Hughes Incorporated
InventorsIngolf Wassermann, Hanno Reckmann, Michael Neubert
Life of this patent
Estimating the term…
Abstract
Measurements made with at least two sensors (flow rate or pressure) during generation of a message concurrently with operation of a noise source are used to estimate a channel transfer function. The estimated transfer function is then used to attenuate pump noise in a mud pulse telemetry system. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.
Claims20
A method of communicating a signal through a fluid in a borehole between a first location and a second location, the method comprising:
- (a) measuring signals in the fluid at at least two spaced apart positions at or near the second location in response to operation of a noise source and generation of a first message at a first time;
- (b) measuring additional signals in the fluid at the at least two spaced apart positions in response to operation of the noise source and generation of the first message at a second time;
- and
- (c) estimating a characteristic of the fluid between the first location and a second location from the measured signals and the additional measured signals.
A system for communicating a signal through a fluid in a borehole between a first location and a second location, the system comprising:
- (a) sensors in the fluid at at least two spaced apart positions at or near the second location configured to:
- (A) measure signals in response to operation of a noise source and generation of a first message by a message source at a first time;
- and
- (B) measure additional signals in the fluid in response to operation of the noise source and generation of the first message by the message source at a second time;
- and
- (b) a processor configured to:
- (C) estimate a characteristic of the fluid between the first location and the second location from the measured signals and the additional measured signals;
- and
- (D) record the estimated characteristic on a suitable medium.
A computer-readable medium for use with a system for communicating a signal through a fluid in a borehole between a first location and a second location, the system comprising:
- (a) sensors in the fluid at at least two spaced apart positions at or near the second location configured to:
- (A) measure signals in response to operation of a noise source and generation of a first message by a message source at a first time;
- and
- (B) measure additional signals in the fluid in response to operation of the noise source and generation of the first message by the message source at a second time;
- the medium comprising instructions which enable a processor to:
- (b) estimate a characteristic of the fluid between the first location and the second location from the measured signals and the additional measured signals;
- and
- (c) record the estimated characteristic on a suitable medium.
Dependencies are inferred from the claim text.