Surge Field Tests Highlight Dynamic Fluid Response

Abstract

Abstract This paper presents actual surge and swab field data during tripping and circulating operations which include both surface and downhole measurements. These data are compared with a dynamic surge model which includes the effects of fluid inertia and compressibility, wellbore elasticity, axial elasticity of the pipe, and temperature dependent fluid properties. The transient response of measured downhole pressure, surface pump pressure, return fluid flow, and hookload are compared with the model and interpreted. The data clearly show dynamic and inertial effects not anticipated by conventional practices but predicted by the model.