Removal of Magnetic Metallic Contamination – Improved Drilling Fluid Performance
- Arild Saasen (University of Stavanger) | Jan Egil Pallin (JAGTECH AS) | Geir Olav Ånesbug (JAGTECH AS) | Alf Magne Lindgren (Schlumberger Oilfield Services) | Gudmund Aaker (Schlumberger Oilfield Services) | Mads Rødsjø (AkerBP)
- Document ID
- Society of Petroleum Engineers
- SPE Offshore Europe Conference and Exhibition, 3-6 September, Aberdeen, UK
- Publication Date
- Document Type
- Conference Paper
- 2019. Society of Petroleum Engineers
- Directional drilling, Solids control
- 28 in the last 30 days
- 87 since 2007
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Different logging operations can suffer from presence of metallic particles in the drilling fluids. Directional drilling in Arctic areas can be a challenge because of magnetic contamination in the drilling fluid. This is a challenge especially when drilling east-west relative to the magnetic north direction. Magnetic and paramagnetic particles in the drilling fluid will shield the down hole compasses and introduce additional errors to the surveying than those normally included in the uncertainty ellipsoid. The objective of the project is to remove the magnetic particles being the largest contributor to this error.
On many offshore drilling rigs there is mounted ditch magnets to remove metallic swarf from the drilling fluid. These magnets will normally only remove the coarser swarf. In this project we use a combination of strong magnets and flow directors to significantly improve the performance of the ditch magnets. This combination, together with proper routines for cleaning the ditch magnets significantly helps cleaning the drilling fluid.
By the combined use of flow directors and ditch magnets it was possible to extract more than five times as much magnetic contamination from the drilling fluid. This is verified by comparing the ditch magnet efficiencies from two drilling rigs drilling ERD wells. The logging tool signal strengths of several down hole instruments were unusually good and insignificant down times were observed on the logging tools. The results are anticipated to have aided to the directional drilling performance.
Detailed information on how to clean the drilling fluid properly from magnetic contamination is presented. It is also shown that this cleaning is significantly better than conventional cleaning of magnetic debris from drilling fluids.
|File Size||903 KB||Number of Pages||9|
Amundsen, P.A., Torkildsen, T., and Saasen, A. 2006., Shielding of Directional Magnetic Sensor Readings in a Measurement While Drilling Tool for Oil Well Positioning. Journal of Energy Resources Technology, 128 (4):343-345. DOI: 10.1115//1.2358151.
Bang, J., Torkildsen, T., Brun, B.T. and Håvardstein, S.T. 2009. Targeting Challenges in Northern Areas due to Degradation of Wellbore Positioning Accuracy. Paper SPE/IADC-119661-MS presented at the SPE/IADC Drilling Conference and Exhibition, Amsterdam, The Netherlands, 17–19 March. DOI: 10.2118/119661-MS.
Edvardsen, I., Hansen, T.L., Gjertsen, M. and Wilson, H., 2013 Improving the Accuracy of Directional Wellbore Surveying in the Norwegian Sea". SPE Drilling & Completions, Vol. 28, no. 2, paper SPE-159679-PA. doi:10.2118/159679 –PA
Edvardsen, I., Nyrnes, E., Johnsen, M.G. and Willer, A.N. 2019. Best Practices and Recommendations for Magnetic Directional Surveying in the Barents Sea. Paper SPE-195600-MS presented at the SPE Norway One Day Seminar held in Bergen, Norway, 14 May. doi.org/10.2118/195600-MS
Kabirzadeh H., Rangelova, E., Lee, G.H., . 2018. Dynamic Error Analysis of Measurement While Drilling Using Variable Geomagnetic In-Field Referencing. SPE J., 23 (6), paper SPE-188653-PA. doi.org/10.2118/188653-PA
Pattarini, G., Strømø, K.M., Saasen, A.. 2017. Ditch Magnets Removal of Steel Particles. Paper SPE-185939-MS presented at the SPE Bergen One Day Seminar, 5 April, Bergen, Norway. doi.org/10.2118/185939-MS
Saasen, A., Ding, S., Amundsen, P.A. and Tellefsen, K. 2016. The Shielding Effect of Drilling Fluids on Measurement While Drilling Tool Downhole Compasses –The effect of Drilling Fluid Composition, Contaminants and Rheology. Journal of Energy Resources Technology, vol. 138, no. 5: 052907-052907-6. DOI:10.1115/1.4033304
Tellefsen, K., Ding, S., Saasen, A.. 2012. The Effect of Drilling Fluid Content on Magnetic Shielding of Downhole Compasses in MWDs. Paper SPE-150548-MS presented at the SPE Deepwater Drilling and Completions Conference, Galveston, Texas, USA, 20–21 June. doi: 10.2118/150584-MS.
Torkildsen, T., Edvardsen, I., Fjogstad, A., . 2004. Drilling Fluid affects MWD Magnetic Azimuth and Wellbore Position. Paper SPE/IADC-87169-MS presented at the SPE/IADC Drilling Conference, Dallas, Texas, 2–4 March. doi: 10.2118/87169-MS.
Waag, T. I., Torkildsen, T., Amundsen, P. A.. 2012. The Design of BHA and the Placement of the Magnetometer Sensors Influence How Magnetic Azimuth is Distorted by the Magnetic Properties of Drilling Fluids. SPE D&C, 27 (3) paper SPE-151039-PA. doi.org/10.2118/151039-PA
Wilson, H. and Brooks, A.G. 2001. Wellbore Position Errors Caused by Drilling Fluid Contamination. Paper SPE-71400-MS presented at the SPE Annual Technical Conference and Exhibition, New Orleans, 30 September -3 October. DOI: 10.2118/71400-MS.