Determining gradients using a multi-probed formation tester
First Claim
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1. A method for determining a formation fluid density gradient comprising:
- disposing a multi-probed formation testing tool in a wellbore;
determining a wellbore fluid density gradient;
determining a flowline fluid density gradient as a function of the wellbore fluid gradient; and
determining a formation fluid density gradient as a function of the flowline fluid density gradient.
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Abstract
Methods for operating multi-probed formation testers to determine a fluid density gradient in the formation. The probes of the multi-probed formation tester are connected to a pressure gauge through a flowline that establishes a differential height between the probes. In some embodiments, a gradient of the fluid density in the flowline is determined as a function of the gradient of fluid density in the wellbore. The flowline fluid density gradient is then used to determine a formation fluid density gradient as a function of the flowline fluid density gradient.
30 Citations
23 Claims
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1. A method for determining a formation fluid density gradient comprising:
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disposing a multi-probed formation testing tool in a wellbore; determining a wellbore fluid density gradient; determining a flowline fluid density gradient as a function of the wellbore fluid gradient; and determining a formation fluid density gradient as a function of the flowline fluid density gradient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a multi-probed formation testing tool comprising;
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disposing the multi-probed formation testing tool in a wellbore formed in a formation; determining a wellbore fluid density gradient; using the wellbore fluid density gradient to determine a flowline fluid density gradient; measuring a formation fluid density gradient; and using the flowline fluid density gradient to correct the measurement of the formation fluid density gradient. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for correcting a formation gradient determined by formation pressure measurements made by a first and second probe of a multi-probe formation testing toll, the method comprising:
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determining a flowline density gradient in a flowline having a length approximately equal to the distance between the first and second probes of the multi-probed formation testing tool; determining a formation gradient; and using the flowline density gradient to correct the determined formation gradient. - View Dependent Claims (17, 18, 19)
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20. A formation testing tool comprising:
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an upper section having a first extendable probe and a first port; a lower section having a second extendable probe and a second port; a flowline providing fluid communication between the upper and lower sections; and a first pressure gauge in communication with the flowline, wherein the formation testing tool has a first wellbore pressure measurement mode where said first pressure gauge is in isolated fluid communication with the first port, a second wellbore pressure measurement mode where said first pressure gauge is in isolated fluid communication with the second port, a first formation pressure measurement mode where said first pressure gauge is in isolated fluid communication with the first extendable probe, and a second formation fluid pressure measurement mode where said first pressure gauge is in isolated fluid communication with the second extendable probe. - View Dependent Claims (21, 22, 23)
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Specification