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• W2144772011 abstract "Abstract Permeability is one of the most important parameters for evaluating the production potential of a reservoir. Though there are several ways to determine permeability, the focus here is on formation tester pretests. The pretest is a routine measurement that provides in situ values of formation mobility (permeability/viscosity) at several depths along a wellbore. Because this measurement is easily accessible, it is of interest to maximize the value of the information obtained. Two types of mobility can be determined from a pretest, one of them is the mobility obtained using the amplitude of the pressure signal, usually referred to as drawdown mobility. This measurement has a very shallow depth of investigation; therefore, it characterizes only the formation in the immediate vicinity of the probe, i.e., it is an indicator of the mobility at the wellbore wall, where formation damage is likely to occur. The uncertainty associated with this mobility measurement decreases when the drawdown is long enough to approximate steady state flow. Another way of inferring mobility is done by analyzing the pressure transient signal during the late stage of buildup, during the so-called spherical flow period, hence it is referred to as the spherical mobility. This method has the advantage of characterizing properties deeper in the formation. However, the spherical flow regime is usually difficult to identify in the recorded pressure signal, and in the few instances where it has been claimed to be identified, the inferred formation mobility is almost always smaller than the drawdown mobility. A major problem in analyzing pressure data during the spherical flow period is that it requires quantifying a small rate of change in the signal as equilibrium is approached. In this study, we model the performance of three different tool configurations with six different formations having mobility ranging from 0.001md/cp to 100md/cp, to identify the pretest parameters that maximize the pressure signal during the spherical flow regime. The results may be used as a general guideline on the selection of pretest parameters when the objective is to evaluate formation properties away from the wellbore. When representative values of drawdown and spherical mobility are obtained, it is possible to infer the undamaged formation mobility as well as the magnitude of the formation skin." @default.
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• W2144772011 date "2010-09-19" @default.
• W2144772011 modified "2023-09-27" @default.
• W2144772011 title "Inducing Spherical Flow Conditions with Formation Testers" @default.
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• W2144772011 doi "https://doi.org/10.2118/133523-ms" @default.
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