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US 8,555,966 B2Granted
Formation testing apparatus and methods
AssigneeBaker Hughes Incorporated
InventorsJorge O. Maxit, Jinsong Zhao
Life of this patent
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Abstract
A formation testing apparatus and method are disclosed. In one aspect, a fluid is drawn from a formation, one or more sensors measure pressure of the fluid during the during drawing of the fluid, and a processor estimates an inflection point from the pressure measurements and controls the drawing of the fluid from the inflection point until the pressure of the fluid drops to a selected level.
Claims9
A formation testing method, comprising:
- calibrating a fast response sensor to a slow response sensor;
- drawing a fluid from a formation during a first drawdown of a formation test;
- determining drawdown pressure during the first drawdown before an inflection point of the drawdown pressure using measurements from the fast response sensor without measurements from the slow response sensor;
- estimating the inflection point of the drawdown pressure using the drawdown pressure determined using the measurements from the fast response sensor without the measurements from the slow response sensor;
- controllably drawing the fluid after the inflection point;
- and
- determining the drawdown pressure during the controlled drawing of the fluid after the inflection point using measurements from the slow response sensor to test the formation.
4 more elements
Dependencies are inferred from the claim text.