Using a Physical Wellbore Model To Study Formation Damage Problems in Well Completions

Abstract

Abstract This paper describes the design and operation of a high pressure, high temperature wellbore model using either consolidated or unconsolidated core material. It can be configured with up to eight perforated cores representing varied zonal permeability. The model is set up for flow in either the injection or the production direction. It is acid rated and fluids can be pumped at rates to 130 BPD. Gravel-packing is accomplished in the model with either water or polymer carrier fluids. The model is used to perform laboratory evaluations of completion practices and stimulation techniques. We have evaluated the formation damaging potential of commonly used loss circulation materials and the inability to clean up some of these materials in unconsolidated formations. We have used the model to demonstrate the benefits of gravel pre-packing to avoid loss in perforation flow capacity. We have also evaluated diverting agents designed to improve coverage and stimulation of damaged zones.