Determination of transient drainage across lease boundaries

A technique which simplifies the determination of how much oil or gas flows across a linear segment during the transient flow period of the reservoir is presented. The technique is based on two definite integrals which result from application of the line-source solution of flow in an infinite-acting reservoir combined with the fundamental definition of flow across a plane. The theory, the outline of a methodology, and several examples are provided. The examples, one which determines the flow across a lease line for transient flow in an oil reservoir, one using the method for a bounded lease, and one using the method to assess the well spacing in a tight-gas reservoir, show that the technique can be applied to a variety of practical problems. Graphical solutions to the definite integrals are given to facilitate application of the method.