Concentric Fluid Loss Control Devices Increase Reliability of Subsea Dual-Zone Selective Intelligent Completions in the Deepwater GoM

Abstract

This paper discusses the application of Concentric Fluid Loss Control Devices (C-FLCDs) in the sandface sections of dual-zone selective intelligent completions. Specific focus is placed on the need for increased reliability in debris environments over traditional Ball Valve Fluid Loss Control Devices (BV-FLCDs). Historic Non-Planned Time (NPT) events due to debris deposition above BV-FLCDs prompted consideration of alternative FLCD technology that would be more debris tolerant. Technologies considered needed to support features such as: bi-directional pressure integrity for zonal isolation, remote actuation for reservoir communication and integration with intelligent completion hardware. The selected C-FLCD technology allowed debris to pass through the device rather than being deposited above it. In addition, flow erosion and Computational Flow Dynamics (CFD) modelling showed that the C-FLCDs did not limit the flow rate from either the Lower Zone or Upper Zone where installed. To date, after eight dual-zone completion installations in the Deepwater GoM, there has been 100% successful application of the C-FLCDs.