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US 8,464,790 B2Granted
Brine salinity from sound speed
AssigneeBaker Hughes Incorporated
InventorRocco DiFoggio
Life of this patent
Estimating the term…
Abstract
Temperature and pressure measurements that are made downhole are used to predict a compressional wave velocity for pure water under downhole conditions. The predicted velocity and a measured compressional velocity of a formation brine are used in a non-iterative method to estimate a value of the formation brine salinity that is between 0 and 1.
Claims15
An apparatus configured to evaluate a formation fluid, the apparatus comprising:
- a carrier configured to be conveyed in a borehole in the formation;
- a sample chamber for receiving a sample of the formation fluid;
- a transducer on the carrier configured to receive an acoustic pulse from a sample of the formation fluid in the sample chamber;
- and
- at least one processor configured to use:
- (I) a travel time of the acoustic pulse over a known distance, and
- (II) a predicted value of a velocity of water under borehole conditions, to estimate a salinity of the formation fluid using a non-iterative method.
4 more elements
A method of evaluating a formation fluid, the method comprising:
- conveying a carrier into a borehole;
- using a transducer on the carrier to receive an acoustic pulse from a sample of the formation fluid in a sample chamber;
- and
- using at least one processor for estimating a salinity of the formation fluid using a non-iterative method from a travel time of the acoustic pulse over a known distance in the sample of the formation fluid and a predicted value of a velocity of water under borehole conditions.
1 more element
An apparatus configured to evaluate a formation fluid, the apparatus comprising:
- a carrier configured to be conveyed in a borehole in the formation;
- a transducer on the carrier configured to receive an acoustic pulse from a sample of the formation fluid;
- and
- at least one processor configured to use:
- (I) a travel time of the acoustic pulse over a known distance, and
- (II) a predicted value of a velocity of water under borehole conditions, to estimate a salinity of the formation fluid using a non-iterative method;
- wherein the transducer is part of a transducer assembly further comprising a first reflector and a second reflector, and wherein the known distance further comprises a distance between the first reflector and the second reflector.
4 more elements
Dependencies are inferred from the claim text.