Drilling a Challenging HP/HT Well Utilizing an Advanced ECD Management System With Decision Support and Real-Time Simulations
- Rolv Rommetveit (eDrilling Solutions) | Sven Inge Odegard (eDrilling Solutions) | Christine Nordstrand (eDrilling Solutions) | Knut Steinar Bjorkevoll (SINTEF Petroleum Research) | Pierre Rolf Cerasi (SINTEF Petroleum Research) | Hans Martin Helset (SINTEF Petroleum Research) | Mikkel Fjeldheim | Stein Tjelta Havardstein (Nexen Exploration Norge AS)
- Document ID
- Society of Petroleum Engineers
- IADC/SPE Drilling Conference and Exhibition, 2-4 February, New Orleans, Louisiana, USA
- Publication Date
- Document Type
- Conference Paper
- 2010. IADC/SPE Drilling Conference and Exhibition
- 1.6 Drilling Operations, 1.10 Drilling Equipment, 4.3.4 Scale, 1.7.6 Wellbore Pressure Management, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.6.4 Drillstem/Well Testing, 1.11.2 Drilling Fluid Selection and Formulation (Chemistry, Properties), 5.2.1 Phase Behavior and PVT Measurements, 3 Production and Well Operations, 1.12.2 Logging While Drilling, 5.3.2 Multiphase Flow, 1.5 Drill Bits, 1.14 Casing and Cementing, 2 Well Completion, 1.7.3 Dual Gradient Drilling, 1.7.2 Managed Pressure Drilling, 1.8 Formation Damage, 2.7.1 Completion Fluids, 5.1.2 Faults and Fracture Characterisation, 1.12.6 Drilling Data Management and Standards, 1.7.5 Well Control, 5.8.9 HP/HT reservoirs
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A very challenging HPHT well has been drilled utilizing an advanced ECD Management System including real time simulations, early diagnosis of upcoming problems, and real time simulations using state-of-the art models. The System uses all available real time drilling data (surface and downhole) in combination with real time modeling to monitor and optimize the drilling process. This information is used to visualize the wellbore in 3D in real time. It has been implemented in Total E&P Norge TASC (Total Activities Support and Collaboration) Center in Norway. The system is composed of the following elements, some of which are unique and ground-breaking:
• An advanced and fast Integrated Drilling Simulator which is capable of modeling the different drilling sub-processes dynamically, with interaction between these sub-processes in real time.
• Automatic quality check and corrections of drilling data; making it suitable for processing by computer models
• Real time supervision methodology for the drilling process using time based drilling data as well as drilling models / the integrated drilling simulator.
• Methodology for diagnosis of the drilling state and conditions. This is obtained from comparing model predictions with measured data.
• Advisory technology for more optimal drilling.
• A Virtual Wellbore, with advanced 2D and 3D visualization of the downhole process.
• Data flow and computer infrastructure.
Among the challenges during planning and drilling of this well have been:
• Very small window between pore and fracture pressure. RT ECD simulations were performed with an advanced hydraulic and thermal wellbore model.
• Increased probability for instabilities in the tight window. Was mitigated by RT stability modeling during drilling.
• Pore pressure predictions which were updated during drilling.
Experiences from the drilling as well as use of the ECD Management System will be summarized and presented. The usefulness of supervision and diagnosis functionalities is illustrated.
Hild East high pressure gas field is located in the central North Sea in the production licences P040 (blocks 29/9 & 30/7) and P043 (blocks 29/6 & 30/4). Water depth ranges from 100 to 130 meters.
A total of 11 exploration wells have been drilled in the area since 1975 and of these six discovery wells with gas condensate at high pressures. Five wells with Upper Jurassic objectives were drilled on the Hild area between 1977 and 1983. In addition one well with a Tertiary objective was also drilled in 1975 (first discovery well).
|File Size||693 KB||Number of Pages||12|