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Quality of Permeability and Pore Pressure Estimate via the DFIT


 

Quality of Permeability and Pore Pressure Estimate via the DFIT Related Terms

Quality of Permeability and Pore Pressure Estimate via the DFIT, DFIT, Frac Monitoring, Surface Pressure Transient Testing

One of the questions we always get is "how good" is the data collected via the DFIT?  An illustration I typically use is one below which have been utilized by other industry engineers but it is a simple continuum from low to high on the "confidence" of the derived analysis for the DFIT.  We consider the data derived from the DFIT more reliable than those achieved from an RFT or a log/core analysis but less than that from a multi-rate flow test or PBU.  However, given the nature of the extremely low in situ permeability the DFIT is really the ONLY option, in these types of formations, to collect pressure transient test data. 

How does the DFIT Measure up to other methods

The DFIT is another "tool" in the engineers toolkit to assist him/her at arriving at some conclusions about the specific formation.  We know that having information is preferable to not having information but only if used appropriately

Quality of Pressure Transient Test Methods

Diagram

DFIT tests are very common in unconventional reservoirs because it is a relatively easy test to perform, inexpensive, and in addition to permeability and pore pressure can provide keyfrac parameters such as closure pressure, net pressure, efficiency, tortuosity and some rock stresses.

In vertical multi-layered wells with unknown pressures (depleted?) and permeabilities, it can eliminate uncertainty in fracture stimulation operations and provide pore pressure mapping for infill drilling applications.


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