# US 9,753,179 B2 · Methods and apparatus for determining downhole fluid parameters

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- Number: US 9,753,179 B2
- Document ID: US9753179B2
- Status: Granted
- Kind: B2
- Application number: 14/125,291
- Filed: 2012-06-13
- Published: 2014-06-05
- Granted: 2017-09-05
- Earliest claimed: 2011-06-13
- Assignees: Schlumberger Technology Corporation
- Applicants: Abdur Rahman Adil; Elena Borisova; Tullio Moscato
- Inventors: Abdur Rahman Adil; Elena Borisova; Tullio Moscato
- Web page: https://patentgrep.com/patent/US9753179B2

## CPC

- G01V 9/005: {by thermal methods, e.g. after generation of heat by chemical reactions}
- E21B 47/00: Survey of boreholes or wells (monitoring pressure or flow of drilling fluid E21B21/08)
- E21B 47/07: Temperature
- E21B 47/10: Locating fluid leaks, intrusions or movements
- E21B 47/103: using thermal measurements
- E21B 49/08: Obtaining fluid samples or testing fluids, in boreholes or wells
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- E21B: EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS

## Abstract

Methods for determining downhole fluid parameters include disposing apparatus including a sensor in a fluid in a wellbore. The sensor includes a heater and a temperature sensor, and the fluid is flowing at a velocity of about zero centimeters per second to about ten centimeters per second. The fluid includes particulates, paraffin or asphaltenes. The methods further include obtaining a first measurement via the heater and obtaining a second measurement via the temperature sensor. Based on the first measurement and the second measurement, the velocity of the fluid is determined.

## Claims

### Claim 1

A method, comprising:
disposing a sensor in a fluid in a wellbore, the sensor comprising a heater and a temperature sensor, the fluid flowing at a velocity of about zero centimeters per second to about ten centimeters per second, the fluid comprising at least one of particulates, paraffin and asphaltenes;
obtaining a first temperature measurement via the heater;
obtaining a second temperature measurement via the temperature sensor; and
based on the first temperature measurement and the second temperature measurement, determining the velocity of the fluid.

### Claim 2 (depends on 1)

The method of claim 1 wherein the fluid comprises different phases.

### Claim 3 (depends on 1)

The method of claim 1 wherein disposing the sensor in the fluid comprises disposing a production logging tool in the wellbore.

### Claim 4 (depends on 1)

The method of claim 1 further comprising producing the fluid from a subterranean formation adjacent the wellbore.

### Claim 5 (depends on 1)

The method of claim 1 wherein disposing the sensor in the fluid comprises disposing the sensor on a completion tool.

### Claim 6 (depends on 1)

The method of claim 1 wherein the sensor is capable of sensing the fluid flowing at a velocity of about zero meters per second to about ten meters per second.

### Claim 7

A method, comprising:
disposing a downhole tool in a fluid in a wellbore, the downhole tool including a sensor comprising a heater and a temperature sensor, the fluid flowing at a velocity less than about ten centimeters per second, the fluid comprising one of particulates, paraffin and asphaltenes;
determining a thermal property selected from a temperature excursion or a normalized power dissipation between the heater and the fluid via the sensor; and
based on the thermal property, determining the velocity of the fluid.

### Claim 8 (depends on 7)

The method of claim 7 wherein the fluid comprises different phases.

### Claim 9 (depends on 7)

The method of claim 7 wherein disposing the downhole tool in the fluid comprises disposing a production logging tool in the fluid.

### Claim 10 (depends on 7)

The method of claim 7 further comprising producing the fluid from a subterranean formation adjacent the wellbore.

### Claim 11 (depends on 7)

The method of claim 7 wherein disposing the downhole tool in the fluid comprises disposing a completion tool in the wellbore.

### Claim 12

A method, comprising:
disposing a downhole tool in a wellbore, the downhole tool including a sensor comprising a heater and a temperature sensor, wherein the sensor is capable of sensing fluid flow having of a velocity of about zero meters per second to about ten meters per second;
producing fluid comprising at least one of paraffin and asphaltenes from a subterranean formation adjacent the wellbore;
obtaining a response of the sensor; and
based on the response, determining the velocity of the fluid.

### Claim 13 (depends on 12)

The method of claim 12 wherein the fluid is flowing at the velocity of about zero centimeters per second to about ten centimeters per second.

### Claim 14 (depends on 12)

The method of claim 12, wherein the fluid comprises particulates.

### Claim 15 (depends on 12)

The method of claim 12 wherein the fluid comprises different phases.

### Claim 16 (depends on 12)

The method of claim 12 wherein disposing the downhole tool in the wellbore comprises disposing a completion tool in the wellbore.

### Claim 17 (depends on 12)

The method of claim 12 wherein disposing the downhole tool in the wellbore comprises disposing a production logging tool in the wellbore.

### Claim 18 (depends on 12)

The method of claim 12 further comprising collecting downhole data with the downhole tool.