Pressure Distribution of Horizontal Wells in a Layered Reservoir with Simultaneous Gas Cap and Bottom Water Drives

摘要

A plot of dimensionless pressure versus dimensionless time on a log-log paper was done for the six sets of data to illustrate the pressure distribution of horizontal wells in a two layered reservoir with simultaneous gas cap and bottom water drive. From the graphs it was shown that dimensionless pressure increases with dimensionless time.We also observed that when there is crossflow, pressure distribution in such reservoir is the same as that of the homogeneous system. Pressure responses in crossflow reservoir are higher than that of without crossflow. We also observed that the following affects the pressure distribution: Well location along x-axis,x wD ,Wellbore radius r wD ,Interlayer fluid mobility ratio, time Normalization factor, dimensionless Well length L D and dimensionless height h D . It was also observed that the well location z wD along z-axis does not affect pressure distribution for two layered reservoir.Two-layer crossflow liner with Partial Isolations well completion would be recommended This method provides limited zone isolation, which can be used for stimulation or production control along the well length. Also two-layer reservoir without crossflow with cased hole completion is recommended because it provides a high degree of the wellbore control and reservoir management.Cased hole completions are excellent for reservoirs where the horizontal well is being drilled to minimize coning problems. Perforations may be selectively squeezed off to prevent the influx of unwanted fluid.