... compressibility changes during pretest operations. This method enhances petrophysical interpretation by identifying fluid types, particularly gas, in interbedded sandstone and shale formations. Traditional petrophysical methods often misidentify gas as oil due to shoulder bed effects, leading to incorrect...

.... To moderate the influence of supercharging and obtain the best quality formation pressure, pumps-off pretest has been tried for first time in the south China sea which can take pretest while mud circulation stops and a battery provides the power. With the accurate formation pressure and mobility from FPWD...

... machine learning classification pretest interpretation reservoir permeability evaluation intrinsic permeability permeability estimation mobility porosity lithofacies Classification lithofacies Japan Fluid Dynamics evaluation effective permeability 25th formation evaluation symposium...

... behavior versus time in a pretest, one can a direct measurement of fluid mobility. This mobility can be converted to permeability if fluid viscosity is known. We can then use the permeability derived from pretests to calibrate the specific surface area of clay in our permeability log interpretation. Here...

... rise to fluid complexities include current/multiple reservoir charging, biodegradation, water/gas washes, and leaky seals. Asphaltenes gradient can also be used to complement pressure for vertical compartmentalization and lateral continuity analysis. Efficient probe pretesting tool with capability...