Theoretical Dimensionless Breakthrough Time of a Horizontal Well in a Vertically-Stacked Two- Layered Reservoir System with Varying Architecture Part I: Letter 'B' Architecture, Edge Water Drive Mechanism

摘要

In this paper, which is Part I of a series, theoretical breakthrough times of different models of a crossflow two-layered reservoir having an architecture similar to letter 'B' and experiencing an edge water drive, with or without a top gas, are derived. The theoretical breakthrough times are based on dimensionless pressure distributions of each identified model. Results show that thirty-four (34) different models are possible considering all forms of edge water drive with or without gas cap. Furthermore, in edge water drives of all forms, dimensionless breakthrough times are generally affected by horizontal well penetration and layer anisotropy. The farther the well penetrates into the layer the longer external fluid breakthrough is delayed. Layer thickness or fluid properties do not affect dimensionless breakthrough time.