Integrating Technology for Improving Recovery and Field Redevelopment in a Highly Heterogeneous Carbonate Reservoir

Abstract

Abstract Field XYZ located in the western offshore India is a multi-pay, multi-layered heterogeneous Carbonate reservoir having lateral discontinuities. Discontinuous layers and scale deposition and near well bore damage have led to multi-dimensional problems related to both upper and lower completions reducing ultimate field recovery. Workover attempts like re-perforation, additional perforations and plugging, artificial lift by electrical submersible pump (ESP) and secondary recovery by water injection were implemented to maximize the field recovery. However, any work over had only short term impact on production increase.Also, water injection and ESP performance were inefficient. Production History showed cyclic decline in production with time. Identifying and locating the layers' discontinuities became crucial in candidate selection and design of efficient injection pattern, artificial lift, completion and work over in existing and new infill wells. The following case study presents a workflow involving multi well geological, petro physical and time lapse formation pressure data and production logs to identify and locate lateral discontinuity within a pay of the field. As a result, the reservoir pressure support attempts using water injection methods were proved to be suboptimal. Furthermore, this workflow has been successfully implemented for identifying location of infill wells and candidate selection and design of wells to be completed with ESP. Seven future candidates for ESP were recognized. Additionally, locations of three new infill wells are identified and a strategic layer wise completion was designed and executed. Implementation of the results increased production from the field by 27%.