Dynamic Pre-Modelling of MPD Operations Enabled Optimal Procedures and Operations
- Johnny Petersen (Intl Research Inst of Stavanger) | Knut Steinar Bjorkevoll (SINTEF Petroleum Research) | Rolv Rommetveit (SINTEF Petroleum Research)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition, 25-27 August, Jakarta, Indonesia
- Publication Date
- Document Type
- Conference Paper
- 2008. IADC/SPE Asia Pacific Drilling Technology Conference and Exhibition
- 1.7.2 Managed Pressure Drilling, 5.8.9 HP/HT reservoirs, 5.3.2 Multiphase Flow, 1.7.1 Underbalanced Drilling, 5.2 Reservoir Fluid Dynamics, 1.6.1 Drilling Operation Management, 1.11 Drilling Fluids and Materials, 6.5.3 Waste Management, 1.14 Casing and Cementing, 1.7.5 Well Control, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6 Drilling Operations, 1.10 Drilling Equipment, 1.6.1 Drilling Operation Management
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An advanced dynamic flow and temperature model was used to optimize and control MPD operations at Kvitebjørn. This paper describes in detail pre-simulations done to prepare for operations and develop detailed procedures, and post-analysis of real time data done to improve performance with respect to upcoming MPD operations at Kvitebjørn. The paper gives details on:
• Pre-simulations of drilling operations including temperature effects
• Extra offline simulations during operations
• Post-simulations with analysis of model-data deviations
Results and observations:
The paper discusses in details critical operations with main focus on sequences with multiple fluids in the well. These include setting of a balanced mud pill, tripping out and in with the pill in the hole, circulating out the pill, and cementing. Comparison with data taken when testing in cased hole is discussed, and it is described how good pressure control was obtained in real operations after having drilled into the reservoir.
Applications and conclusions:
The paper gives useful input to the use of advanced dynamic models for MPD operations. It gives a good impression of current status as well as possibilities and limitations for future operations.
The Kvitebjørn field in the North Sea, close to Statfjord and Gullfaks, started production in 2004. Conventional drilling continued after this, but the increasing pressure depletion caused severe losses on the ninth well. This event put an end to conventional drilling at Kvitebjørn, and the development of a comprehensive managed pressure drilling setup started.
Due to an operational window between pore and fracture pressure that was very small and uncertain, good control of all dynamic effects was addressed by using and advanced dynamic flow and temperature model both before, during and after operations on each well. By using calibrated dynamic software and detailed measurements of mud and fluid parameters as a function of pressure and temperature, it was possible to make procedures based on the best available data and the most reliable computations.
A general overview of the first MPD operations at Kvitebjørn is given in Ref. 1, while more details on parts of the setup is given in Refs. 2-4. Earlier UBD/MPD experience offshore Norway is described in Refs. 5-8.
The numerical model used in these computations has been thoroughly discussed in Petersen et al. (Ref. 9). Only a very brief discussion is included here, please go to Ref. 9 for a more detailed discussion.
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