The Use of Modeling To Enhance the Analysis of Formation-Pressure Integrity Tests
- Mark W Alberty (Hess Corporation) | Michael R McLean (Independent Pore Pressure Consultant)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- December 2014
- Document Type
- Journal Paper
- 431 - 437
- 2014.Society of Petroleum Engineers
- leak-off test, LOT, FPIT, formation integrity test
- 5 in the last 30 days
- 638 since 2007
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Formation-pressure integrity tests (FPITs) are used to verify the integrity of cement at a casing shoe, measure the stress state of the exposed formations for well planning and operations, and determine the maximum equivalent circulating density to which a shoe can be safely exposed. Critical decisions on operations are made directly from the results and include decisions about the need for remedial cement operations, maximum mud weights that can be used to drill the next well section, minimum mud weights that can be used to prevent hole collapse, calibration factors for predicting fracture gradients, and the potential need for lost-circulation-mitigation strategies. The interpretation techniques of the result most frequently focus on the point at which a fracture first starts, the point at which unstable fracture growth begins, or the closure pressure of the fracture when pumping ceases. However, the early pressure buildup behavior is often overlooked and can provide much insight on the integrity of cement, the point of the start of a fracture, the permeability of the formation being tested, the need for cement remediation, and the potential to increase fracture resistance by use of wellbore-strengthening techniques. This paper presents a model for predicting early pressure buildup behavior, discusses how the model can be used to improve the interpretation of FPITs significantly, and provides examples of the application in select wells.
|File Size||1 MB||Number of Pages||7|
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