INTEGRATED PRODUCTIVITY MODEL FOR GAS WELL WITH HIGH-PRESSURE GRAVEL-PACK SAND CONTROL

Productivity Ratio(PR) is firstly put forward to evaluate the effect of gravel-packing sand control measure on gas well productivity. After high-pressure gravel packing, there will form an additional flow resistance areas composed of gravel inside casing, perforation filled with gravel and the packed area outside the wellbore. Considering the non-Darcy flow, the pressure drop of radial and linear flow across the areas are calculated and the calculation method of PR is established. Combined with performance relationship (IPR) before sand control, the IPR curve after sand controlling could be obtained by PR. The application results indicate that this simplified model needs only fewer data but its results are very reliable.