Transient-Pressure Analysis for an Interference Slug Test

Abstract

ABSTRACT This paper presents a new general solution for an interference slug test in a two-region composite system with both active well and observation well having wellbore storage and skin. The solution technique, which employs the Laplace transformation and addition theorem of Bessel function, is new and different from past works. As a reduced form of the general solution, slug test interference analysis in a homogeneous domain is readily obtained by letting the properties in both regions be identical. The paper presents the characteristic pressure responses for interference slug tests, as well as some slug test design criteria. Dimensionless correlation parameters and parametric analyses are discussed, An interpretation technique for a slug test in a homogeneous system is presented. Two type curves are presented along with two correlation groups. The first correlation group, (CD/LD2)(LnCD+2S), is applicable for the case when the effects of the wellbore storage and skin in the observation well are negligible. The second correlation group, (CD/LD2)[LnCD+0.8( S1+S2)], is applicable when wellbore storage values in both wells are identical, and skin values are arbitrary. Interference slug testing in various composite reservoirs is discussed, including oil-gas well interference, and interference in the presence of a linear boundary.