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Low permeable collectors with fracturing: the interpretation of hydrodynamic research based on the analysis of well’s yield reduction

Authors: A.V. Baryshnikov, V.V. Sidorenko (Gazpromneft-Khantos LLC), V.V. Kokurina, M.I. Kremenetskiy, C.I. Melnikov, A.A.Ridel (Gazpromneft NTC LLC )
Low permeable reservoirs well-tests are often ambiguously interpretive. Short well-tests doesn’t see “radial” flow, long ones has not unique interpretation due to simultaneous influence of changes in reservoir pressure, skin-factor and relative permeability. Long term downhole pressure measurement is required to increase well-test results reliability. Pressure gage instillation on ESP is used in Gazpromneft. Case study shown optimum technique is long term drawdown and periodic build-ups with on-line flowing bottomhole pressure registration during fluid level increase. Coincident interpretation of drawdown and build-ups gives permeability and changes in skin-factor and reservoir pressure with time and make a reliable forecast.
Low permeable reservoirs well-tests are often ambiguously interpretive. Short well-tests doesn’t see “radial” flow, long ones has not unique interpretation due to simultaneous influence of changes in reservoir pressure, skin-factor and relative permeability. Long term downhole pressure measurement is required to increase well-test results reliability. Pressure gage instillation on ESP is used in Gazpromneft. Case study shown optimum technique is long term drawdown and periodic build-ups with on-line flowing bottomhole pressure registration during fluid level increase. Coincident interpretation of drawdown and build-ups gives permeability and changes in skin-factor and reservoir pressure with time and make a reliable forecast.


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