Measuring and testing – Borehole or drilling – Downhole test
Patent
1992-01-24
1993-10-05
Williams, Hezron E.
Measuring and testing
Borehole or drilling
Downhole test
166250, 166264, E21B 4311, E21B 4312, E21B 4710, E21B 4908
Patent
active
052494616
ABSTRACT:
A new method and apparatus for performing a drill stem test in an open (not cased) borehole are disclosed. When the borehole is initially drilled, the drilling process induces a skin damage near the external surface of the open (not cased) wellbore. It is necessary and desirable to bypass, reduce, or eliminate the skin damage in order to provide a free or natural flow of well fluid from the reservoir in the formation into the wellbore. However, in order to determine the degree of skin damage which exists near the external surface of the wellbore, reservoir parameters such as pressures, temperature and flowrates of the formation fluid flowing from the reservoir into the wellbore is first measured in the presence of the skin damage. The skin damage is then bypassed, removed, eliminated, or reduced by, for example, perforating the external surface of the wellbore. When the wellbore surface has been perforated, the reservoir parameters such as pressures, temperature and flowrates of the formation fluid flowing from the perforated holes into the wellbore are re-measured thereby determining the true formation reservoir parameters such as pressures, temperature and flowrates of the formation well fluid in the reservoir. The reservoir parameters may be re-measured simultaneously with bypassing or reducing the skin damage, or the reservoir parameters may be re-measured only after the skin damage has been bypassed or reduced.
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McDonald Bryan W.
Parrott Robert A.
Ponder Gaylon D.
Bouchard John H.
Dombroske George M.
Garrana Henry N.
Schlumberger Technology Corporation
Williams Hezron E.
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