Dynamic Simulation Applications to Support Challenging Offshore Operations: A Kitan Field Offshore East Timor Case Study
- Ryosuke Yokote (Eni Australia Ltd) | Vanni Donagemma (Eni Australia Ltd) | Juan Carlos Mantecon (SPT Group)
- Document ID
- Society of Petroleum Engineers
- SPE Annual Technical Conference and Exhibition, 8-10 October, San Antonio, Texas, USA
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 4.2 Pipelines, Flowlines and Risers, 6.3.3 Operational Safety, 4.5.7 Controls and Umbilicals, 4.1.5 Processing Equipment, 4.2.4 Risers, 3.1.6 Gas Lift, 5.3.2 Multiphase Flow, 4.5.3 Floating Production Systems, 2 Well Completion, 4.5 Offshore Facilities and Subsea Systems, 2.3 Completion Monitoring Systems/Intelligent Wells, 1.8 Formation Damage, 1.10 Drilling Equipment, 5.5.8 History Matching, 4.1.2 Separation and Treating, 3 Production and Well Operations, 5.4.2 Gas Injection Methods, 5.6.8 Well Performance Monitoring, Inflow Performance, 5.6.4 Drillstem/Well Testing, 1.7 Pressure Management, 2.2.2 Perforating
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This paper describes the use of multiphase flow numerical transient simulation to assist a petroleum engineer in making proper critical decisions during supervision of well cleanup operations on a rig, and initial well startup operations on a Floating Production Storage and Offloading facility (FPSO).
Eni JPDA 06-105 operates the Kitan oil field located in the Joint Petroleum Development Area (JPDA) between East Timor and Australia. The Kitan oil field consists of three subsea intelligent wells, subsea flowlines, risers, and one FPSO. The three wells were completed and cleaned up using the rig before the FPSO arrived on location.
The intelligent completions were modeled in detail using commercial dynamic simulation software to establish a sound and safe operating procedure for the well cleanup and well test. The simulation results provided the petroleum engineer on the rig with key operational information, such as the time for the oil to arrive at surface, expected pressure at the down-hole gauges (DHGs) and upstream of the choke manifold, etc. This enhanced the ability of rig site supervisors to anticipate well behavior, enabling a significant risk reduction.
The well models were successfully validated with the data obtained after the well cleanup and well testing campaign was finished. The validated well models were integrated with flowline and riser models to investigate the optimum field startup operations and to overcome constraints in the production system which emerged late in the project. Different topside choke and multi-stage hydraulic down-hole flow control valves (FCVs) opening schedules were tested to predict pressure and temperature at the DHGs, the subsea tree (SST) and the FPSO, as well as the flow rates and oil arrival time at the FPSO.
The dynamic simulation results played an important role in defining a sound and safe operating procedure for the well cleanup and well test, and initial field startup, providing the offshore petroleum engineer with reliable operating guidelines.
The Kitan oil field is located in JPDA 06-105, about 200 km south of the East Timor coast and 500 km offshore of the northern coast of Australia (Fig. 1). Eni JPDA 06-105 Pty Ltd is the operator of the permit with a 40 per cent (%) working interest. The other Joint Venture partners are Inpex Timor Sea Ltd (35 %) and Talisman Resources (JPDA 06-105) Pty Ltd (25 %).
Kitan-1 was spudded in January 2008, resulting in the discovery of the Kitan oil field. Following the success of Kitan-1, an appraisal well Kitan-2 was spudded in March 2008 which confirmed extension of the Kitan oil field. The JPDA 06-105 Joint Venture submitted a development plan to the petroleum regulator for the region, ANP (Autoridade Nacional do Petroleo), in May 2009 and the plan was approved in April 2010. Well completion and cleanup campaigns for development wells, Kitan-2ST1, Kitan-3 and Kitan-5 were finished in February 2011. Subsequently, subsea flowlines were installed and the FPSO arrived on location in September 2011. The Kitan oil field achieved first oil production in October 2011, only 3 years and 9 months after spudding Kitan-1 discovery well.
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