68 A 10 cP viscosity oil is being produced from a 150 acre d

6.8

A 10 cP viscosity oil is being produced from a 150 acre drainage area where the average pressure is 2000 psi. The radius of the wellbore is 4.5 in., the thickness of the pay zone is 20 ft, and the bottom hole flowing pressure is 1250 psi. The formation permeability is 100 mD. Calculate three oil flow rates honoring the skin factors obtained in Problems 6.6 (Links to an external site.) and 6.7 (Links to an external site.), respectively, and zero skin effect. All other conditions remain the same. Note 1 acre = 43,560 ft2. Assume steady-state radial flow.

Solution

Oil viscosity

Absolute viscosity provides a measure of a fluid’s internal resistance to flow. For liquids, viscosity corresponds to the informal notion of \"thickness\". For example, honey has a higher viscosity than water.

Any calculation involving the movement of fluids requires a value of viscosity. This parameter is required for conditions ranging from surface gathering systems to the reservoir. Correlations for the calculation of viscosity can be expected to evaluate viscosity for temperatures ranging from 35 to 300°F.