Tengiz Field Surveillance: Planning Strategy and Implementation
- Damira Tursinbayeva (Tengizchevroil) | Karl Michael Lindsell (Tengizchevroil) | Thomas Anthony Zalan (Tengizchevroil) | Darrin Allen Dunger (Chevron Corporation) | Baurzhan Kassenov (University of Tulsa) | Randy Howery (Tengizchevroil)
- Document ID
- Society of Petroleum Engineers
- Abu Dhabi International Petroleum Conference and Exhibition, 11-14 November , Abu Dhabi, UAE
- Publication Date
- Document Type
- Conference Paper
- 2012. Society of Petroleum Engineers
- 1.6 Drilling Operations, 3 Production and Well Operations, 4.4.2 SCADA, 5.1 Reservoir Characterisation, 5.6.4 Drillstem/Well Testing, 3.2.6 Produced Water Management, 5.5.8 History Matching, 5.3.2 Multiphase Flow, 3.3.1 Production Logging, 4.2.3 Materials and Corrosion, 5.5.5 Evaluation of uncertainties, 4.3.4 Scale, 5.4.7 Chemical Flooding Methods (e.g., Polymer, Solvent, Nitrogen, Immiscible CO2, Surfactant, Vapex), 2.2.2 Perforating, 5.2.1 Phase Behavior and PVT Measurements, 5.6.11 Reservoir monitoring with permanent sensors, 4.4.3 Mutiphase Measurement, 5.4.2 Gas Injection Methods, 5.8.7 Carbonate Reservoir, 6.5.3 Waste Management, 3.2.2 Downhole intervention and remediation (including wireline and coiled tubing), 5.6.5 Tracers
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Over the field life, surveillance in Tengiz oil field has provided historical and baseline data for simulation history matching, static and dynamic reservoir characterization and modeling, and the foundation for efficient well management. Hence, it continues to be an important part of everyday field operations. At the surveillance planning stage, the comprehensive opportunity list of well candidates is developed based on input provided by members of multiple teams: geologists and petrophysists, production and reservoir engineers, drilling and field operations specialists. SCADA system, permanent downhole gauges (PDHGs) and multiphase flow meters (MPFMs) are widely implemented for production data acquisition and analysis. However, the majority of surveillance activities still need well intervention into the high pressure, high H2S concentration wellbores, often during harsh weather conditions. Each job execution plan is therefore focused on the safest procedure to obtain the necessary data. Each planned survey in the surveillance plan is ranked according to the value of information to be obtained, in order to help schedule the timing of surveillance based on plant production needs.
The ultimate goal is to safely execute planned surveillance to support production optimization and field development work. This paper will highlight TCO success in addressing the different reservoir and well production uncertainties through a properly designed surveillance plan with both short and long-term objectives.
Tengizchevroil (TCO) operates Tengiz field in addition to the smaller satellite Korolev field. They are large carbonate reservoirs in western Kazakhstan located on the south side of the 500,000 square kilometer (km2) Pricaspian basin on the northeastern edge of the present-day Caspian Sea (Figure 1). Tengiz reservoir has a very large areal extent; approximately 110 km2 in area at its top and 400 km2 at its base. The Tengiz oil column is thick. The top of the reservoir is located at approximately -3,850 m subsea and the approximate oil water contact is at -5,450 m subsea.
The surveillance program is critical for such a big reservoir as Tengiz to understand field dynamic behavior and to support base business. On an annual basis, the surveillance plan is shaped in a way to achieve three main goals:
- Address reservoir uncertainties;
- Monitor reservoir and individual well performances;
- Comply with state regulatory requirements.
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