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US 8,037,747 B2Granted
Downhole fluid characterization based on changes in acoustic properties
AssigneeBaker Hughes Incorporated
InventorRocco DiFoggio
Life of this patent
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Abstract
Techniques for evaluating physical aspects of a formation fluid from within a wellbore include changing at least one of a pressure on and a temperature of a sample of the formation fluid and transmitting at least one acoustic pulse through the fluid sample and analyzing acoustic information collected. Apparatus and methods for the evaluating involve using at least one acoustic transducer. Analyzing typically involves use of formulae that relate equation (s) of state and other properties for the fluid to a change in the sound speed in the fluid.
Claims7
A method for evaluating properties of a fluid sample, comprising:
- disposing a tool into a wellbore;
- receiving the fluid sample into a sample chamber of the tool;
- changing at least one of a pressure and a temperature of the fluid sample;
- transmitting at least one acoustic signal into the fluid sample;
- and
- analyzing the at least one acoustic signal to evaluate the properties of the fluid sample;
- wherein the changing, transmitting and analyzing are performed for a plurality of pressures and/or temperatures and changing the temperature comprises adjusting the temperature to at least one predetermined temperature.
4 more elements
A method for evaluating properties of a fluid sample, comprising:
- disposing a tool into a wellbore;
- receiving the fluid sample into a sample chamber of the tool;
- changing at least one of a pressure and a temperature of the fluid sample;
- transmitting at least one acoustic signal into the fluid sample;
- and
- analyzing the at least one acoustic signal to evaluate the properties of the fluid sample;
- wherein the changing, transmitting and analyzing are performed for a plurality of pressures and/or temperatures and evaluating the properties of the fluid sample comprises solving the relationship:
- P
- ′
- =
- P
- 0
- +
- A
-
- (
- Δ
-
-
- ρ
- ρ
- )
- s
- +
- B
- 2
- !
-
- (
- Δ
-
-
- ρ
- ρ
- )
- s
- 2
- +
- where
- P′ represents pressure applied to the fluid sample;
- P0 represents pressure in the sample chamber for an unpressurized state;
- ρ represents a density of the fluid sample;
- Δρ represents a change in the density of the fluid sample;
- and
- A, B represent virial coefficients for the fluid sample.
42 more elements
A method for evaluating properties of a fluid sample, comprising:
- disposing a tool into a wellbore;
- receiving the fluid sample into a sample chamber of the tool;
- changing at least one of a pressure and a temperature of the fluid sample;
- transmitting at least one acoustic signal into the fluid sample;
- and
- analyzing the at least one acoustic signal to evaluate the properties of the fluid sample;
- wherein the changing, transmitting and analyzing are performed for a plurality of pressures and/or temperatures and evaluating the properties of the fluid sample comprises solving the relationship:
- δ
- =
- [
- (
- ρ
-
-
- c
- 2
- (
- B
- /
- A
- +
- 1
- )
- )
-
- ln
-
- (
- V
- g
- V
- l
- )
- ]
- ;
- where
- δ represents a solubility parameter for the fluid sample;
- Vg, Vl represent a molar volume of the fluid sample for a gaseous state and a liquid state, respectively;
- c represents the speed of sound in the fluid sample;
- ρ represents the density of the fluid sample;
- and
- A, B represent virial coefficients for the fluid sample.
39 more elements
A method for evaluating properties of a fluid sample, comprising:
- disposing a tool into a wellbore;
- receiving the fluid sample into a sample chamber of the tool;
- changing at least one of a pressure and a temperature of the fluid sample;
- transmitting at least one acoustic signal into the fluid sample;
- and
- analyzing the at least one acoustic signal to evaluate the properties of the fluid sample;
- wherein the changing, transmitting and analyzing are performed for a plurality of pressures and/or temperatures and evaluating the properties of the fluid sample comprises solving the relationship:
- a
- =
- [
- ρ
-
-
- c
- 2
-
- V
- l
- 2
- (
- B
- /
- A
- +
- 1
- )
- ]
- ;
- where
- a represents a measure of attractive forces between molecules in the fluid sample;
- Vl represents a molar volume of the fluid sample for a liquid state;
- c represents the speed of sound in the fluid sample;
- ρ represents the density of the fluid sample;
- and
- A, B represent virial coefficients for the fluid sample.
32 more elements
A method for evaluating properties of a fluid sample, comprising:
- disposing a tool into a wellbore;
- receiving the fluid sample into a sample chamber of the tool;
- changing at least one of a pressure and a temperature of the fluid sample;
- transmitting at least one acoustic signal into the fluid sample;
- and
- analyzing the at least one acoustic signal to evaluate the properties of the fluid sample;
- wherein the changing, transmitting and analyzing are performed for a plurality of pressures and/or temperatures and evaluating the properties of the fluid sample comprises solving the relationship:
- b
- =
- V
- l
- -
- RT
- ρ
-
-
- c
- 2
-
- (
- B
- /
- A
- +
- 1
- )
- ;
- where
- b bears a relation to the size of the molecules in the fluid sample;
- R represents an ideal gas constant;
- T represents a temperature of the fluid sample;
- Vl represents a molar volume of the fluid sample for a liquid state;
- c represents the speed of sound in the fluid sample;
- ρ represents the density of the fluid sample;
- and
- A, B represent virial coefficients for the fluid sample.
33 more elements
Dependencies are inferred from the claim text.