Formation evaluation system and method
First Claim
1. A method of evaluating a fluid from a subterranean formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation, comprising:
- drawing fluid from a formation into an evaluation flowline;
drawing fluid from a formation into a cleanup flowline;
measuring a property of the fluid in the evaluation flowline; and
detecting stabilization of the property of the fluid in the evaluation flowline.
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Accused Products
Abstract
A method of evaluating a fluid from a subterranean formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation is provided. The method involves drawing fluid from a formation into an evaluation flowline, drawing fluid from a formation into a cleanup flowline, measuring a property of the fluid in the evaluation flowline and detecting stabilization of the property of the fluid in the evaluation flowline. Fluid properties in a combined flowline may be generated from the evaluation and cleanup flowlines. The fluid properties of the combined flowline may be used to project future evaluation flowline fluid properties. Contamination levels for a given fluid property of a given flowline may also be determined.
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Citations
40 Claims
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1. A method of evaluating a fluid from a subterranean formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation, comprising:
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drawing fluid from a formation into an evaluation flowline;
drawing fluid from a formation into a cleanup flowline;
measuring a property of the fluid in the evaluation flowline; and
detecting stabilization of the property of the fluid in the evaluation flowline. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method of evaluating a fluid from a subsurface formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation, comprising:
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drawing fluid from the formation into an evaluation flowline;
drawing fluid from a formation into a cleanup flowline;
generating a combined flowline from the evaluation and cleanup flowlines;
determining a virgin fluid break through property (Pmf) and a virgin fluid property (Pvf) for the combined flowline;
measuring at least one fluid property of one of the evaluation flowline, the cleanup flowline, the combined flowline and combinations thereof; and
determining a contamination level for the at least one fluid property from the virgin fluid breakthrough parameter (Pmf), the virgin fluid property (Pvf) and the measured fluid property (Pd). - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
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27. A method of evaluating a fluid from a subsurface formation drawn into a downhole tool positioned in a wellbore penetrating the subterranean formation, comprising:
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drawing fluid from the formation into an evaluation flowline;
drawing fluid from a formation into a cleanup flowline;
generating a combined flowline from the evaluation and cleanup flowlines;
determining at least one initial fluid property of the fluid in the combined flowline for an initial period of time;
estimating at least one projected combined parameter of the fluid for a future period of time for the combined flowline;
estimating at least one projected evaluation parameter of the fluid for the evaluation flowline for the future period of time based on the estimated projected combined parameter; and
determining the time when the projected evaluation parameter reaches a target contamination level.
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Specification