Improving the Accuracy and Reliability of MWD/Magnetic-Wellbore-Directional Surveying in the Barents Sea
- Inge Edvardsen (Baker Hughes) | Erik Nyrnes (Statoil ASA) | Magnar G. Johnsen (University of Tromsø) | Truls Lynne Hansen (University of Tromsø) | Unni Pia Løvhaug (University of Tromsø) | Juergen Matzka (Technical University of Denmark)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- June 2014
- Document Type
- Journal Paper
- 215 - 225
- 2014.Society of Petroleum Engineers
- 1.1 Well Planning, 1.6 Drilling Operations, 1.12.1 Measurement While Drilling, 1.6.6 Directional Drilling, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.6.1 Drilling Operation Management
- high latitude, directional survey accuracy and reliability, drillstring interference, external magnetic field
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The years ahead will see increased petroleum-related activity in the Barents Sea, with operations far off the coast of Norway. The region is at high geomagnetic latitude in the auroral zone, and therefore, directional drilling by use of magnetic reference will experience enlarged azimuth uncertainty compared with operations in the Norwegian and North Seas. Two main contributors to azimuth uncertainty are magnetic disturbances from electric currents in the ionosphere and axial magnetic interference from the drillstring. The former is more frequent in the Barents Sea than farther south, and the effect of the latter is increased because of diminished value of the magnetic horizontal component. Wellbore directional surveying for operations on the continental shelf in the North Sea and the Norwegian Sea rely on well-established procedures for near-real-time magnetic monitoring by use of onshore magnetic-reference stations. The different land and sea configuration, distant offshore oil and gas fields, higher geomagnetic latitude, and different behavior of the magnetic field require the procedures to be reassessed before being applied to the Barents Sea. To reduce drilling delays, procedures must be implemented to enable efficient management of magnetic disturbances. In some areas of the Barents Sea, the management requires new equipment to be developed and tested before drilling, such as seabed magnetometer stations. One simple way to reduce drillstring interference is increasing the amount of nonmagnetic steel in the bottomhole assembly (BHA). To maintain azimuth uncertainty at an acceptable level in northern areas, it is crucial that wellbore-directional-surveying requirements are given high priority and considered early during well planning. During the development phase of an oil and gas field, the planned wells must be assigned adequate positional-uncertainty models and, if possible, be designed in a direction that minimizes the wellbore directional uncertainty.
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Bang, J., Torkildsen, T., Brun, B. T., et al. 2009. Targeting Challenges in Northern Areas due to Degradation of Wellbore Positioning Accuracy. Presented at SPE/IADC Drilling Conference and Exhibition, Amsterdam, the Netherlands, 17–19 March. SPE-119661-MS. http://dx.doi.org/10.2118/119661-MS.
Bowe, J. and McCulloch, S. 2007. The Value of Real-time Geomagnetic Reference Data to the Oil and Gas Industry. In Space Weather: Research towards Applications in Europe, No. 344, ed. J. Lilensten, Chap. 5.2, 289–298. Dordrecht, the Netherlands: Astrophysics and Space Science Library, Springer.
Economides, M.J., Hill, A.D., Ehlig-Economides, C., et al. 2012. Petroleum Production Systems, second edition. Upper Saddle River, New Jersey: Pearson Education, Inc.
Edvardsen, I., Hansen, T.L., Gjertsen, M., et al. 2012. Improving the Accuracy of Directional Wellbore Surveying in the Norwegian Sea. Presented at SPE Annual Technical Conference and Exhibition, San Antonio, Texas, 8–10 October. SPE-159679-MS. http://dx.doi.org/10.2118/159679-MS.
Ekseth, R. 1998. Uncertainties in Connection with the Determination of Wellbore Positions. PhD dissertation, Norwegian University of Science and Technology, Trondheim, Norway (1998).
Friis-Christensen, E. and Wilhjelm, J. 1975. Polar Cap Currents for Different Directions of the Interplanetary Magnetic Field in the Y-Z Plane. J. Geophys. Res. 80 (10): 1248–1260. http://dx.doi.org/10.1029/JA080i010p01248.
Gleisner, H., Rasmussen, O., and Waterman, J. 2006. Large-Magnitude Geomagnetic Disturbances in the North Sea Region: Statistics, Causes, and Forecasting. Adv. Space Res. 37 (6): 1169–1174. http://dx.doi.org/10.1016/j.asr.2005.04.082.
Grindrod, S.J. and Wolff, J.M.1983. Calculation of NMDC Length Required for Various Latitudes Developed From Field Measurements of Drill String Magnetisation. Presented at the IADC/SPE Drilling Conference, New Orleans, Louisiana, February. SPE-11382-MS. http://dx.doi.org/10.2118/11382-MS.
Heppner, J.P. 1972a. The Harang Discontinuity in Auroral Belt Ionospheric Currents. Geophys. Publ. 29: 105–120.
Heppner, J.P. 1972b. Polar-Cap Electric Field Distributions Related to the Interplanetary Magnetic Field Direction. J. Geophys. Res. 77 (25): 4877–4887. http://dx.doi.org/10.1029/JA077i025p04877.
Standards Norway. 2004. NORSOK Standard D-010 Rev. 3: Well Integrity in Drilling and Well Operations. Standards Norway, Lysaker, Norway (August 2004).
Prölss, G.W. 2004. Physics of the Earth’s Space Environment: An Introduction. Bonn, Germany: Springer-Verlag Berlin Heidelberg.
Reay, S.J., Allen, W., Baillie, O., et al. 2005. Space Weather Effects on Drilling Accuracy in the North Sea. Ann. Geophys. 23 (9): 3081–3088. http://dx.doi.org/10.5194/angeo-23-3081-2005.
Russell, J. P., Shiells, G., and Kerridge, D. J. 1995. Reduction of Well-Bore Positional Uncertainty Through Application of a New Geomagnetic In-Field Referencing Technique. Presented at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 22–25 October. SPE-30452-MS. http://dx.doi.org/10.2118/30452-MS.
Torkildsen, T., Sveen, R.H., and Bang, J. 1997. Time Dependent Variation of Declination, Geomagnetic Reference, Report No. 1. IKU Report No. 32.0897.00/01/97, IKU Petroleum Research (1997).
Williamson, H.S. 2000. Accuracy Prediction for Directional Measurements While Drilling. SPE Drill & Compl 15 (4): 221–233. SPE-67616-PA. http://dx.doi.org/10.2118/67616-PA.
Williamson, H.S., Gurden, P.A., Kerridge, D.J, et al. 1998. Application of Interpolation In-Field Referencing to Remote Offshore Locations. Presented at the SPE Annual Technical Conference and Exhibition, New Orleans, Louisiana, 27–30 September. SPE-49061-MS. http://dx.doi.org/10.2118/49061-MS.