Intelligent Well Completion in the Kitan Oil Field
- Ryosuke Yokote (Eni Australia Ltd) | John Milne (Eni Australia Ltd) | Carla Sanasi (Eni Australia Ltd) | Pierre Hosatte (Schlumberger) | Nurtas Mukashev (Schlumberger) | Nishant Chadha (Parsons Brinckerhoff)
- Document ID
- Society of Petroleum Engineers
- SPE Asia Pacific Oil and Gas Conference and Exhibition, 22-24 October, Perth, Australia
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 1.11 Drilling Fluids and Materials, 4.2.4 Risers, 2.7.1 Completion Fluids, 4.2 Pipelines, Flowlines and Risers, 1.7 Pressure Management, 4.1.5 Processing Equipment, 3.1.6 Gas Lift, 4.3.4 Scale, 4.5.7 Controls and Umbilicals, 5.5.8 History Matching, 5.6.1 Open hole/cased hole log analysis, 4.5.10 Remotely Operated Vehicles, 3 Production and Well Operations, 2.3 Completion Monitoring Systems/Intelligent Wells, 7.2.3 Decision-making Processes, 1.10 Drilling Equipment, 4.5 Offshore Facilities and Subsea Systems, 5.1 Reservoir Characterisation, 2.2.2 Perforating, 2 Well Completion, 5.6.4 Drillstem/Well Testing, 1.1 Well Planning, 1.6 Drilling Operations, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 1.8 Formation Damage, 2.2.3 Fluid Loss Control, 4.5.3 Floating Production Systems, 5.1.2 Faults and Fracture Characterisation, 5.4.2 Gas Injection Methods
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The first hydraulically operated completion was installed in Australia in 2004 (Guatelli et al 2004). Since then, a number of intelligent completions have been installed in offshore Australia. The remoteness of offshore Australia, particularly in the Timor Sea area, means intervention vessels are not readily available and well interventions are costly operations. For this reason, intelligent completion is considered to be an attractive alternative, by providing a down-hole solution to actively manage the reservoir production life and delay potential water breakthrough.
The Kitan oil field is remotely located in the Joint Petroleum Development Area (JPDA) between East Timor and Australia. The Kitan oil field production facilities consist of three vertical producing wells, subsea flowlines, risers, and one Floating Production Storage and Offloading (FPSO) facility. The wells were completed with an intelligent design and cleaned up using a rig before the FPSO arrived on location.
The intelligent completion design consists of two multi-stage hydraulic down-hole Flow Control Valves (FCVs) and three Down-Hole Gauges (DHGs) to independently control and monitor two different production zones. The FCVs have a total of 8 positions (fully opened, fully closed and 6 intermediate choke positions).
It is planned to close the lower FCV to shut off water production from the lower zone while the upper FCV remains fully opened over the field life. The different FCV choke positions were utilized during the field startup and during the early stages of production while the water cut was still low, to overcome unforeseen technical limitations in the production system, and to optimize hydrocarbon production.
This paper describes various aspects of the Kitan oil field intelligent well completion from design through installation and field startup to early stage of production operations, and includes technical problems encountered during the field startup as well as lessons learnt.
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 Production Sharing Contract (PSC) 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 (spudded in March 2008) confirmed extension of the Kitan oil field. The JPDA 06-105 Joint Venture submitted a development plan to the petroleum regulator for the region, Autoridade Nacional do Petroleo (ANP), in May 2009 and the plan was approved in April 2010. Well completion and cleanup campaigns for the 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.
Fig. 2 illustrates the excellent correlation of the oil bearing reservoir units of the Laminaria Formation and the underlying Plover Formation sandstone. Analogue fields in the JPDA and adjacent area have shown a strong aquifer support and some workovers were required to mitigate the water production. Subsea well intervention is a very costly operation in the Timor Sea because intervention vessels are not readily available. For this reason, an intelligent completion design was adopted for the Kitan oil field, to control water production from each zone individually.
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