The Interpretation Back Pressure of the Results of Gas of Testing Wells

CIM Bulletin, 1961

The ongm and limitations of the conventional and empirical equation for the interpretation of the results of back pressure tests on gas wells are discussed. Difficulties in data interpretation arise from many causes, including Jack of flow stabilization, uncertainties in connection with the friction calculation, and the effect of turbulence near the sand face in the reservoir. A procedure is developed to account for the turbulence effect. This is based upon the theoretical equation for laminar steady state flow and current knowledge of turbulent steady state flow. The procedure involves the expression of the equation for combined laminar-turbulent steady state flow in terms of a turbulence contribution factor. This factor . is shown to be dependent mainly upon the flow rate per unit of pay thickness and the reservoir permeability. The method of interpretation permits the use of judgment based upon the theory and present day understanding of laminar-turbulent flow and is considered an improved method for interpretation of stabilized flow or isochronal data, particularly in cases where high flow rates per unit of thickness are encountered.
Keywords: Calculations, compressibility factor, laminar flow, Reynolds number, steady state, turbulence, Data, flow, Pressure, Sand, Slopes, test, Tests, Value, Wells