# US 2019/0376384 A1 · Methods and systems for spectrum estimation for measure while drilling telemetry in a well system

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- Number: US 2019/0376384 A1
- Document ID: US20190376384A1
- Status: Published application
- Kind: A1
- Application number: 16/544,118
- Filed: 2019-08-19
- Published: 2019-12-12
- Earliest claimed: 2016-06-30
- Assignees: Schlumberger Technology Corporation
- Applicants: Schlumberger Technology Corporation
- Inventors: Julius Kusuma; Arnaud Jarrot; Adeel Mukhtar; Liang Sun; Robert W. Tennent; David Kirk Conn; Luis Eduardo DePavia
- Web page: https://patentgrep.com/patent/US20190376384A1

## CPC

- E21B 47/13: by electromagnetic energy, e.g. radio frequency
- E21B 47/125: using earth as an electrical conductor (by electromagnetic energy E21B47/13)
- E21B 47/18: through the well fluid {, e.g. mud pressure pulse telemetry}
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

A method for configuring transmission signals is disclosed. The method includes receiving a signal from a downhole tool in a wellbore. The signal may include a telemetry portion and a noise portion. The method also includes reproducing the telemetry portion based at least partially on the signal. Further, the method includes subtracting the telemetry portion from the signal. The method includes estimating, based at least partially on the subtraction, the noise portion of the signal. The method also includes altering a transmission configuration of the downhole tool based at least partially on the noise portion of the signal.

## Claims

### Claim 1

A method for configuring transmission signals in a measuring while drilling (MWD) wellbore tool, comprising:
receiving at an earth surface, from a transmission of the MWD wellbore tool, a signal from the MWD wellbore tool in a wellbore, wherein the signal comprises a telemetry portion comprising physical properties of the wellbore measured in the wellbore and a noise portion;
generating an analytical telemetry spectrum, wherein the analytical telemetry spectrum represents an ideal spectrum of the telemetry portion;
generating a spectrum estimate of the telemetry portion based at least partially on the analytical telemetry spectrum;
subtracting the spectrum estimate of the telemetry portion from a spectrum of the signal;
estimating, based at least partially on the subtraction, the noise portion of the signal; and
altering a transmission configuration of the MWD wellbore tool, for further transmitting the signal to the earth surface, based at least partially on the estimated noise portion of the signal.

### Claim 2 (depends on 1)

The method of claim 1, wherein altering the transmission configuration comprises at least one of setting a modulation type for transmitting the signal, setting a frequency band for transmitting the signal, setting a bit rate for transmitting the signal, setting a modulation rate for transmitting the signal, setting a carrier rate for transmitting the signal, setting a symbol rate for transmitting the signal, setting an amplitude for transmitting the signal, setting a pulse shape for transmitting the signal, setting a cyclic prefix length for transmitting the signal, setting a number of subcarriers for transmitting the signal, setting active subcarriers for transmitting the signal, setting a bandwidth for transmitting the signal, setting a noise reduction method for the signal, and setting a maximum depth for transmitting the signal.

### Claim 3 (depends on 1)

The method of claim 1, wherein altering the transmission configuration comprises sending one or more telemetry modes or parameters to the MWD wellbore tool.

### Claim 4 (depends on 1)

The method of claim 1, wherein the signal comprises at least one of a mud pulse signal or an electromagnetic signal.

### Claim 5 (depends on 1)

The method of claim 1, where generating the spectrum estimate of the telemetry portion comprises solving an inverse problem for the analytical telemetry spectrum.

### Claim 6 (depends on 1)

The method of claim 1, where generating the spectrum estimate of the telemetry portion comprises fitting channel parameters and scaling parameters based at least partially on the analytical telemetry spectrum.