Methods for measuring a formation supercharge pressure
First Claim
1. A method of determining the supercharge pressure in a formation intersected by a borehole having a wall, the method comprising:
- disposing a formation pressure test tool into the borehole, said formation pressure test tool comprising a probe for isolating a portion of the borehole;
extending said probe into sealing contact with the borehole wall;
performing at least one drawdown test with said formation pressure test tool by drawing formation fluid into a drawdown chamber of said formation pressure test tool and measuring fluid pressure in said drawdown chamber;
modeling the supercharge pressure of the formation using transient pressure effects caused by the dynamic properties of a mudcake formed on the borehole wall; and
determining the supercharge pressure of the formation using said supercharge pressure model.
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Abstract
A method of determining the supercharge pressure in a formation intersected by a borehole having a wall, the method comprising disposing a formation pressure test tool into the borehole having a probe for isolating a portion of the borehole. The method further comprises extending the probe into sealing contact with the borehole wall. The method further comprises performing at least one drawdown test with the formation pressure test tool. The method further comprises modeling the supercharge pressure of the formation using the dynamic properties of the mudcake. The method further comprises determining the supercharge pressure of the formation using the supercharge pressure model. The formation pressure test tool may be conveyed into the borehole using wireline technology or on a drill string. Using the supercharge pressure, the drawdown test may be optimized, the characteristics of the drilling fluid altered, or the measurements of other sensors adjusted.
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Citations
26 Claims
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1. A method of determining the supercharge pressure in a formation intersected by a borehole having a wall, the method comprising:
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disposing a formation pressure test tool into the borehole, said formation pressure test tool comprising a probe for isolating a portion of the borehole; extending said probe into sealing contact with the borehole wall; performing at least one drawdown test with said formation pressure test tool by drawing formation fluid into a drawdown chamber of said formation pressure test tool and measuring fluid pressure in said drawdown chamber; modeling the supercharge pressure of the formation using transient pressure effects caused by the dynamic properties of a mudcake formed on the borehole wall; and determining the supercharge pressure of the formation using said supercharge pressure model. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification