TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractWe examine the two-year history of an extended reach duallateral well, in which lateral production has been controlled by downhole flow control valves to minimize water production and optimize the lift effected by a high-horsepower electrical submersible pump. We assess the impact of downhole flow control on production performance by a modeling exercise consisting of refining a region surrounding the wellbore to reproduce the observed production history, and then forecasting the performance of that refined model under alternate completion scenarios. This methodology can also be used to select valve settings that are most advantageous to production.

TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractThe increased complexity of hydraulic and complex electrohydraulic flow-control systems, especially with multizone completions, substantially increases deployment risk. Until now it has not been possible to provide an infinitely variable flow-control system for multiple zones using only a single conduit from surface.The BP Wytch Farm F-22 well has an all-electric tubingretrievable flow-control device installed as the primary active downhole component in the intelligent completion system. This device integrates an electromechanical adjustable choke, multiple quartz pressure and/or temperature sensors, and a mass-flow sensor, all powered from the surface through one permanent downhole cable. Multiple flow-control devices can be run on the same cable to provide zonal control and monitoring. Each device is independently addressable, allowing the operator to adjust any zone in the well on command and react to potential reservoir uncertainties in real time. The presence of an electric pump cable near the permanent downhole cable at the Wytch Farm installation has demonstrated that the communication system working on a twisted pair cable is immune to noise. The fully electrical system can establish a secure link between multiple downhole sensing and flow-control components, the surface acquisition system, and remote control locations where reservoir engineers and production specialists can monitor and control well operations. Infinitely variable flow control coupled with real-time monitoring and data transmission will facilitate and accelerate the development of subsea, deepwater, and other hostile location wells by eliminating the need for surface or close infrastructure.