Method for determining a permeability or mobility of a radial flow response of a reservoir
First Claim
1. A method comprising:
- positioning a formation testing tool within a wellbore formed within a subsurface reservoir, wherein the tool has an observation probe configured to obtain pressure data;
analyzing via the formation testing tool the obtained pressure data to determine when radial flow is reached;
determining via the formation testing tool vertical permeability or vertical mobility of the reservoir based on when radial flow is reached and a Horner analysis of the subsurface reservoir at or adjacent to the observation probe.
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Abstract
A system and method determine formation permeability and/or at least one property indicative of formation permeability of a subsurface geological reservoir having radial-flow. Pressure data is obtained with an observation probe during a formation test, wherein the observation probe is located at a setting position within an open hole wellbore formed within the reservoir. The system and method measure radial-flow response of the reservoir at or adjacent to the setting position of the observation probe by analyzing the collected pressure data. The formation permeability and/or at least one property indicative of the permeability of the reservoir is determined based on the measured radial-flow response of the reservoir at or adjacent to the observation probe.
14 Citations
13 Claims
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1. A method comprising:
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positioning a formation testing tool within a wellbore formed within a subsurface reservoir, wherein the tool has an observation probe configured to obtain pressure data; analyzing via the formation testing tool the obtained pressure data to determine when radial flow is reached; determining via the formation testing tool vertical permeability or vertical mobility of the reservoir based on when radial flow is reached and a Horner analysis of the subsurface reservoir at or adjacent to the observation probe. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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obtaining pressure measurements with an observation probe of a formation testing tool during a pressure drawdown test or pressure buildup test, wherein the observation probe is located at a setting position within a wellbore formed within a subsurface geological reservoir and the wellbore is an open hole wellbore; determining via the formation testing tool when radial flow of the reservoir at or adjacent to the setting position of the observation probe is reached by analyzing the collected pressure data; determining via the formation testing tool horizontal permeability or horizontal mobility of the reservoir based on when radial flow is reached and a Homer analysis of the reservoir at or adjacent to the observation probe; and determining via the formation testing tool vertical permeability or vertical mobility of the reservoir based on when radial flow is reached and a Horner analysis of the reservoir at or adjacent to the observation probe. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification