DRILLWELL PAPERS

JOURNAL PAPERS:
  • Aarsnes, U.J.F., Acikmese, B., Ambrus, A. and Aamo, O.M. 2016. ''Robust Controller Design for Automated Kick Handling in Managed Pressure Drilling''. Journal of Process Control, vol 47, November, pp46-57
  • Aarsnes, U.J.F., Ambrus, A., Di Meglio, F., Vajargah, A.K., Aamo, O.M., van Oort, E. 2016. ''A Simplified Two-Phase Flow Model using a Quasi-Equilibrium Momentum Balance''. International Journal of Multiphase Flow, Vol.83, pp 77-85.
  • Aarsnes, U.J.F., Flåtten, T., Aamo, O.M. 2016. ''Review of two-phase flow models for control and estimation''. Annual Reviews in Control, vol 42, 2016, p50-62.
  • Aarsnes, U.J.F., Van de Wouw, N. 2017. ''Dynamics of a distributed drill string: Characteristic parameters and stability maps''. Journal of Sound and Vibration.
  • Aarsnes, U.J.F., Shor, R. 2017. ''Torsional vibrations with bit off bottom: modeling, identification and field data validation''. Journal of Petroleum Science and Engineering.
  • Aas, B., Sørbø, J., Stokka, S., Saasen A., Godøy, R., Lunde, Ø. and Vrålstad, T.  2017. ''Cement Placement with Tubing Left in Hole during Plug and Abandonment''. JPT Journal.
  • Abrahamsen, E.B., Selvik, J.T. 2014. ''A framework for selection of inspection intervals for well barriers''. ESREL conference London, 29 Sep-2. Oct.
  • Ambrus, A., Ambrus, A., Aarsnes, U.J., Vajargah, A.K., Akbari, B., van Oort, E., Aamo, O.M. 2016. ''Real-Time Estimation of Reservoir influx Rate and Pore Pressure Using a Simplified Two-Phase Flow Model''. Published online in Journal of Natural Gas Science and Engineering.
  • Amirhossein, N., Aarsnes, U.J.F. and Johansen, T.A. and Kaasa, G.-O. 2017. ''State and Parameter Estimation of a Drift-Flux Model for Under-Balanced Drilling Operations''. IEEE transactions on control systems technology.
  • Askarinezhad, R., Hatzignatiou, D.G., Stavland, A. 2017. ''Disproportionated Permeability Reduction of Water-soluble Silicate Gelants - Importance of Formation Wettability''. SPE Production & Operations (ISSN 1930-1855).
  • Assembayev, D., Myrseth, V., Werner, B., Gyland, K.R., Saasen, A., Ibragimova, Z., Ytrehus, J.D. 2016. ''Establishing an experimental pre-conditioning procedure for rheological characterization of oilbased drilling fluids''. Annual Transactions of the Nordic Rheology Society, Vol. 23, 2015.
  • Cayeux, E., Daireaux, B. 2016. ''Insights in the Physical Phenomena that Influences Automatic Gain/Loss Detection during Drilling Operations''. SPE Drilling & Completion, SPE-166801-PA.
  • Cayeux, E., Taiwo, M., Tanripada, S., Zidan, M., Fjelde, K.K. 2014. ''Real-time Evaluation of Hole Cleaning Conditions Using a Transient Cuttings Transport Model''. SPE Drilling and Completion Journal, Vol 29, No.1.
  • Cayeux, E., Daireaux, D., Balov, M.K., Haavardstein, S.,   Stokland, L.M., Saasen, A. 2017. ''Embedding Automatic Risk-Level Estimation and Performance Analysis in Drilling Plans''. JPT Journal, Volume 69, Issue: 9, 1. September.
  • Cayeux, E., Shor R., Ambrusc, A., Pournazaric, P., Ashokc, P., van Oort, E. 2017. ''From Shallow Horizontal Drilling to ERD Wells: How Scale affects Drillability and the Management of Drilling Incidents''. Journal of Petroleum Science and Technology, Vol 160, Pages 91-105, January.
  • Chen, Y., Lorentzen, R.J., Vefring, E. 2014. ''Optimization of Well Trajectory Under Uncertainty for Proactive Geosteering''. SPE-172497-PA. SPE Journal.
  • De Andrade, J., Sangesland, S. 2016. ''Cement Sheath Failure Mechanisms: Numerical Estimates to Design for Long-Term Well Integrity''. Journal of Petroleum Science and Engineering (ISSN 0920-4105), vol 147, pp682-698.
  • De Andrade, J., Sangesland, S., Todorovic, J. Vrålstad, T. 2016. ''Cement Sheath Integrity During Thermal Cycling: A Novel Approach for Experimental Tests of Cement Systems''. SPE-173871-MS, Journal of Petroleum Science and Engineering.
  • De Andrade, J., Sangesland, S., Skorpa, R., Todorovis, S., Vrålstad, T. 2016. ''Experimental Laboratory Setup for Visualization and Quantification of Cement-Sheath Integrity''. SPE Drilling & Completions, SPE.173871-PA.
  • Gardner, D., 2017. ''Reducing the cost of Well abandonment''. Oil and Gas European Magazine, Vol 1, January.
  • Gelyani, A.M., Selvik, J.T., Abrahamsen, E.B. 2014. ''Decision criteria for updating test intervals for well barriers''. Journal of risk research.
  • Hatzignatiou, D.G., Askarinezhad, R., Giske, N.H., Stavland, A. 2016. ''Laboratory Testing of Environmentally Friendly Sodium Silicate Systems for Water Management Through Conformance Control''. SPE Productions & Operations, vol 31, Issue 04, p337-350, November.
  • Hatzignatiou, D.G., Askarinezhad, R., Giske, N.H., Stavland, A. 2016. ''Laboratory Testing of Environmentally Friendly Sodium Silicate Systems for Water Management''. SPE-173853PA, SPE Production & Operations Journal.
  • Johansen, T.A., Sui, D., Nybø, R. 2013. ''Regularized Nonlinear Moving horizon Observer with Robustness to Delayed and Lost Data''. IEEE transactions on control systems technology.
  • Khalifeh, M., Saasen, A., Vrålstad, T., Hodne, H. 2014. ''Potential Utilization of Class C Flash-based Geopolymer in oil Well Cementing Operations''. Journal of Cement and Concrete Composites 53, p 10-17, Elsevier.
  • Khalifeh, M., Saasen, A., Vrålstad, T.,Larsen, H.B. Hodne, H. 2015. ''Experimental study on the synthesis and characterization of aplite rock-based geopolymers''. Journal of Sustainable Cement-Based Materials.
  • Khalifeh, M., Todorovic, J., Vrålstad, T., Saasen, A., Hodne, H. 2016. ''Long-term durability of rock-based geopolymers aged at downhole conditions for oil well cementing operations''. Journal of Sustainable Cement-Based Materials.
  • Khalifeh, M., Saasen, A., Larsen, H.B., Hodne, H. 2017. ''Development and Charcterization of Norite-Based Cementitious Binder from an Ilmenite Mine Waste Stream''. Hindawi, Advances in Materials Science and Engineering, Vol. 2017, Article ID 6849139, 7 pages.
  • Kullawan, K., Bratvold, R., Bickel, J.E. 2014. ''A Decision Analytic Approach to Geosteering Operations''. SPE Drilling & Completions Journal, Vol. 29, No.1.
  • Kullawan, K., Bratvold, R., Bickel, J.E. 2016. ''Value creation with multi-criteria decision making in geosteering operations''. International Journal of Petroleum Technology 3 (1): 15–31.
  • Kullawan, K., Bratvold, R., Nieto, C.M. 2016. ''Decision-Oriented Geosteering and the Value of Look-Ahead Information: A Case-Based Study''. Paper SPE 184392. SPE Journal, October.
  • Kullawan, K., Bratvold, R., Nieto, C.M. 2016. ''Decision-oriented geosteering and the value of look-ahead information: A case-based study''. SPE Journal.
  • Lavrov, A., Larsen, I., Bauer, A. 2015. ''Numerical modeling of extended leak-off test with a pre-existing fracture''. Journal of Rock Mechanics and Geotechnical Engineering. ISSN 0723-2632. Paper version April 2016, Vol 49, Issue 4, p1359-1368.
  • Linga, H., Bjørkevoll, K. S., Skogestad, J.O., Saasen, A. 2017. ''Study targets potential for gas loading in drilling fluids to improve influx detection, management''. Drilling Contractor July/Aug, Vol 73, No 4, pp 44-49.
  • Liu, Y., Draganov, D., Wapenaar, K., Arntsen, B.  2016. ''Retrieving virtual relection responses at drill-bit positions using seismic interferometry with drill-bit noise''. Geophysical Prospecting, Vol. 63.
  • Liu, Y., Draganov, D., Wapenaar, K., Arntsen, B. 2016. ''Retrieving virtual reflection responses at drill-bit positions using seismic interferometry with drill-bit noise''. Geophysical Prospecting, Volume 64 (2), pp. 348-360.
  • Liu, Y., van der Neut, J., Arntsen, B., and Wapenaar, K. 2016. ''Data-driven deep local imaging near horizontal wells using both surface and borehole data''. Geophysical Journal International, Volume 205 (2), pp. 758-775.
  • Liu, Y., van der Neut, J., Arntsen, B., Wapenaar, K. 2016. ''Combination of surface and borhole seismic data for robust deep target-oriented imaging without accurate velocities''. Geophysical Journal International, vol. 205, issue 2, p758-775.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad, T. 2015. ''Probabilistic Cost and Time Estimation of Rigless Plug and Abandonment''. JPT Journal.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad, T., Arild, Ø. 2015. ''A Probabilistic methodology to Evaluate the Cost Efficiency of Rigless Technology for Subsea Multiwell Abandonment''. SPE Production and Operations.
  • Romdhane, A., Querendez, E. Helset, H.M. 2012. ''FWI for Sub-surface Imaging in the Context of Seismic while Drilling-Synthetic Study''. EAGE Conference & Exhibition.
  • Skorpa, R., Vrålstad, T. 2017. ''Visualization of Fluid Flow through Cracks and Microannuli in Cement Sheaths''. Submitted to SPE Journal.
  • Suter, E., Cayeux, E., Friis, H.A., Kårstad, T., Escalona, A., Vefring, E.H. 2017. ''A Novel Method for Locally Updating an Earth Model While Geosteering''. International Journal of Geosciences, Vol 8, p. 237-264.
  • Torsvik, A., Skogestad, J.O. and Linga, H.  2017. ''An Experimental Study of Gas Influx in Oil-Based Drilling Fluids for Improved Modelling of High-Pressure, High-Temperature Wells''. Paper SPE 178860, SPE Journal. ISSN1064-6671.
  • Udegbunam, J.E., Fjelde, K.K., Evje, S., Nygard, G. 2015. ''On the advection-upstream-splitting-method hybrid scheme: A simple transient-flow model for managed-pressure-drilling and underbalanced-drilling applications''. SPE Drilling & Completions.
  • Zhou, J., Gravdal, J. E., Strand, P., Hovland, S. 2016. ''Automated Kick Control Procedure for an Influx in Managed Pressure Drilling''. Journal of Modelling, Identification and Control (MIC) - special edition on Offshore Technology.
  • Zhou, J., Krstic, M. 2016. ''Adaptive Predictor Control for Stabilizing Pressure in a Managed Pressure Drilling System under Time-delay''. Journal of Process Control, Col 40, pp 106-118.

 
CONFERENCE PAPERS WITH REVIEW:
  • Cayeux, E., Skadsem, H.J. 2014. ''Estimation of weight and torque on bit: Assessment of uncertainties, correction and calibration methods''. OMAE2014-23866 presented at the ASME 2014 International Conference onOcean, Offshore and Arctic Engineering, OMAE2014, San Francisco, California.
  • Cayeux, E., Skadsem, H.J. 2017. ''Modelling of the Dynamic Behavior of the Power Tansmission of an Automatic Small Scale Drilling Rig''. OMAE 2017.
  • De Andradee, J., Sangesland, S., Vrålstad, T., Golan, M. 2014. ''Cement sheath integrity implications of scaled-down wellbore casing-cement-formation sections''. OMAE2014-24266 presented at the ASME 2014 International Conference onOcean, Offshore and Arctic Engineering, OMAE2014, San Francisco, California.
  • Ghauri, A.A, Fjelde, K.K., Frøyen, J. 2016. ''A Transient Model for Hydraulic Simulation of Bullheading and Pressurized Mud Cap Drilling''. OMAE2016-54293.
  • Gomes, D., Bjørkevoll, K., Frøyen, J., Fjelde, K.K., Sui, D., Udegbunam, J.E., Moeinika, F. 2017. ''Probabilistic Flow Modelling Approach for Kick Tolerance Calculations''. In Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering, OMAE, June 25-30, Trondheim, Norway.
  • Iversen, F., Thorogood, J.L., Macoerhson, J.D., Macmillan, R. 2016. ''Business Models and KPIs as Drivers for Drilling Automation''. Presented at SPE Intelligent Energy International Conference and Exhibition, 6-8 September, Aberdeen, Scotland, UK. SPE-181047-MS. DOI 10.2118/181047-MS.
  • Liu, Y., Arntsen, B., Wapenaar, K., van der Neut, J. 2014. ''Combining inter-source seismic interferometry and source-receiver interferometry for deep local imaging''. Society of Exploration Geophysicists conference, Denver, SEG Technical Program, pp5107-5112.
  • Liu, Y., van der Neut, J., Arntsen, B., Wapenaar, K. 2015. ''Data-driven deep local imaging using both surface and borehole seismic daga''. Society of Exploration Geophysicists conference, Denver, SEG Technical Program, pp5554-5559.
  • Moeinikia, F., Fjelde, K.K., Sørbø, J., Saasen, A., Vrålstad, T. 2015. ''A Study of Possible Solutions for Cost Efficient Sybsea Abadonment''. OMAE2015-41261.
  • Myrseth, V.O., Werner B., Lund B., Saasen A., Ytrehus J.D. 2015. ''Rheological properties of oil based drilling fluids and base oils''. Paper OMAE2015-41901, St. Johns, Canada, June.
  • Sayindla, S., Lund, B., Taghipour, A., Werner, B., Saasen, A., Gyland, K.R., Ibragimova, Z., Ytrehus, J.D. 2016. ''Experimental investigation of Cuttings Transport with Oil Based Drilling Fluids''. Proceedings of the 35th International Conference on Ocean, Offshore and Arctic Engineering, June 19-24, Busan, South Korea.
  • Skadsem, H.J., Saasen, A., Håvardstein, S. 2017. ''Casing centralization in irregular wellbores''. OMAE2017-61106, OMAE2017 June 25-30, Trondheim, Norway.
  • Taghipour, A., Opedal, N., Skorpa, R., Vrålstad, T. 2017. ''Improved Laboratory Set-up for Pressurized and Confined Cement Sheath Integrity Tests''. OMAE2017-62444, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. OMAE2017 June 25-30, Trondheim, Norway.
  • Udegbunam, J.E., Sui, D., Moeinikia, F., Lage, A.C.V.M., Fjelde, K.K., Arild, Ø., Rabenafimanantsoa, H.A., Nygaard, G.H. 2017. ''A transient Flow Model for Predicting Pressure Buildup in Closed Annuli''. OMAE2017-62444, Proceedings of the ASME 2017 36th International Conference on Ocean, Offshore and Arctic Engineering. OMAE2017 June 25-30, Trondheim, Norway
  • Werner, B., Oltedal, V. M., Lund, B., Saasen, A., Ibragimova, Z., Ytrehus, J.D., Gyland, K.R. 2016. ''Effects of Oil-Based Drilling Fluid Rheological Properties on Hole Cleaning Performance''. Proceedings of the 35th International Conference on Ocean, Offshore and Arctic Engineering, June 19-24, Busan, South Korea.
  • Ytrehus, J.D., Taghipour, A., Sayindla, S., Lund, B., Werner, B., Saasen, A. 2015. ''Full scale flow loop experiments of hole cleaning performances of drilling fluids''. Paper OMAE2015-41901, St. Johns, Canada, June.
  • Ytrehus, J.D., Lund, B., Taghipour, A., Divyankar, S. 2017. ''Experimental Investigation of Wellvore Fluid Displacement in Concentris and Eccentric Annulus''. OMAE2017 June 25-30, Trondheim, Norway.

CONFERENCE WITH PAPER:
  • Aarsnes, U.J.F., Hauge, E., Godhavn, J.M. 2016. ''Mathematical Modeling of Gas in Riser''. SPE Deepwater Drilling & Completions Conference held in Galveston, Texas, USA, 14–15 September.
  • Aas, B., Sørbø, J., Stokka, S., Saasen A., Godøy, R., Lunde, Ø., Vrålstad, T. 2016. ''Cement Placement with Tubing Left in Hole during Plug and Abandonment''. Paper IADC/SPE-178840 at the SPE Drilling conference in Fort Worth, TX, USA, March 1-3.
  • Abrahamsen, E.B., Selvik, J.T. 2013. ''A framework for selection of inspection intervals for well barriers''. ESREL conference, London, 29 September-2 October.
  • Albawi, A., De Andrade, J., Torsæter, M., Opedal, N., Stroisz, A, Vrålstad, T. 2014. ''Experimental Set-Up for Testing Cement Sheath Integrity in Arctic Wells''. OTC 24587, presented at the Arctic Technology Conference, Houston.
  • Askarinezhad, R., Hatzignatiou, D. 2016. ''Water-Soluble Silicate Gelants for Disproportionate Permeability Reduction: Importance of Formation Wetting and Treatment Conditions''.  Presented at the International Symposium of the Society of Core Analysts, Snowmass, Colorado, USA, 21-26 August.
  • Askarinezhad, R., Hatzignatiou, D. 2016. ''Water-soluble silicate gelants for disproportionate permeability reduction: Importance of formation wetting and treatment conditions''. Paper prepared for presentation at the International Symposium of Society of Core Analysts, Colorado, USA, 21-26 August.
  • Askarinezhad, R., Hatzignatiou, D.G., Stavland, A. 2016. ''Disproportionate Permeability Reduction of Water-Soluble Silicate Gelants – Importance of Formation Wettability''. Paper SPE 179589-MS presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, April 9-13.
  • Askarinezhad, E., Hatzignatiou, D. 2017. ''Improved Disproportionate Permeability Reduction of Silicate-Gelant Treatments: A Laboratory Scale Approach''. Prepared for presentation at SPE International Conference on Oilfield Chemistry, Montgomery, Texas, April 3-5.
  • Bjørkevoll, K., Daireaux, B., Berg, P.C. 2015. ''Possibilities, Limitations and Pitfalls in Using Real-Time Well Flow Models During Drilling Operations''. SPE One Day Seminar, Bergen.
  • Cayeux, E., Mesagan, T., Tanripada, S. Zidan, M. and Fjelde, K.K. 2013. ''Real-time Evaluation of Hole Cleaning Conditions Using a Transient Cuttings Transport Model''. SPE-163492-MS presented at POE/IADC Amsterdam.
  • Cayeux, E., Skadsem, H.J., Kluge, R. 2015. ''Accuracy and Correction of Hook Load Measurements DuringDrilling Operation''. SPE/IADC Drilling Conference and exhibition, London, March 17-19.
  • Cayeux, E., Daireaux, B., Balov, M.K., Haavardstein, S., Stokland, L.M., Saasen, A. 2016. ''Automatic Performance Analysis and Estimation of Risk Level Embedded in Drilling Operation Plans''. Paper SPE-181018 prepared for presentation at the SPE Intelligent Energy International Conference and Exhibition held in Aberdeen, United Kingdom, 6–8 September.
  • Cayeux, E., Daireaux, B., Dvergsnes, E.W., Siahaan, H., Gravdal, J.E. 2014. ''Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions''. SPE Deepwater Drilling and Completions Conference held in Galveston, 10-11 Sep.
  • Cayeux, E., Lande, H.P. 2013. ''Factors Influencing the estimation of downhole pressure far away from measurement points during drilling operations''. 54rd SIMS in Bergen.
  • Cayeux, E., Leulseged, A., Kluge, R., Haga J.  2016. ''Use of a Transient Cuttings Transport Model in the Planning, Monitoring and Post Analysis of Complex Drilling Operations in the North Sea''. Paper IADC/SPE-178862 presented at the SPE Drilling conference in Fort Worth, TX, USA, March 1-3.
  • Cayeux, E., Daireaux, B., Mihai, R. 2017. ''Automatic Risk Uncertainty Estimation to Support Decission Making during Drilling Operation Planning: Case Study on an ERD Well''. Oil and Gas European Magazine, Vol 1, January.
  • Cayeux, E., Daireaux, B., Skadsem, H.J., Holand, R. 2017. ''Challenges and Solutions to the Correct Interpretation of Drilling Friction Tests''. SPE Drilling Conference in The Hague.
  • Chen, Y., Lorentzen, R.J., Vefring, E. 2012. ''Optimization of Well Trajectory under Uncertainty for Proactive Geosteering''. ECMOR XII-13th European Conference on the Mathematics of Oil Recovery.
  • Chen, Y., Luo, X., Vefring, E. 2014. ''On bias correction for parameter estimation problems with applications to model updating for geosteering''. ECMOR XIV-14th European Conference on the Mathematics of Oil Recovery.
  • Daireaux, B., Cayeux, E., Haavardstein, S., Stokland, L.M. 2017. ''Use of Quantitative Risk Analysis Methods to Determine the Expected Drilling Parameter Operating Window Prior to Operation Start: Example from two Wells in the North Sea''. SPE Drilling Conference in The Hague.
  • De Andrade, J., Sangesland, S., Todorovic, J., Vrålstad, T. 2015. ''Cement Sheath Integrity During Thermal Cycling: A Novel Approach for Experimental Tests of Cement Systems''. Paper SPE-173871-MS presented at the SPE One Day Seminar, Bergen, April 22.
  • De Andradee, J., Torsæter, M., Sangesland, S., Todorovic, J., Opedal, N., Stroisz, A., Vrålstad T. 2014. ''Influence of Casing Centralization on Cement Sheath Integrity During Thermal Cycling''. IADC/SPE Drilling Conference, Fort Worth.
  • Fjelde, K.K., Frøyen, J., Ghauri, A.A. 2016. ''A Numerical Study of Gas Kick Migration Velocities and Uncertainty''. Paper SPE-180053 presented at the SPE One Day Seminar, Bergen, April 20.
  • Fjelde, K.K., Frøyen, J., Ghauri, A.A. 2016. ''A Numerical Study of Gas Kick Migration Velocities and Uncertainty''. Presented at SPE Bergen One Day Seminar, 20, April 2016, Grieghallen, Bergen, Norway. SPE 180053.
  • Flatebø, G.Ø., Torsvik, A., Oltedal, V.M., Bjørkvik, B., Grimstad, A.A., Linga, H. 2015. ''Experimental Gas Absorption in Petroleum Fluids at HPHT Conditions''. SPE 173865-MS presented at SPE One Day Seminar, Bergen.
  • Gravdal, J.E., Siahaan, H. Bjørkevoll, K.S. 2014. ''Back-Pressure Managed Pressure Drilling in Extended-Reach Wells – Limiting factors for the ability to achieve accurate pressure control''. SPE 169211, SPE One Day.
  • Grimstad, A.A., Linga H., Saasen, A., 2017. ''Degassing rate of drilling fluid base oils as exposed to depressurisation and drill string rotation''. SPE Drilling Conference in The Hague.
  • Hatzignatiou, D.G., Askarinezhad, R., Giske, N., Stavland, A. 2015. ''Laboratory Testing of Environmentally Friendly Chemicals for Water Management''. SPE One Day.
  • Khalifeh, M., Hodne, H., Korsnes, R.I., Saasen, A. 2015. ''Cap rock restoration in plug and abandonment operations; Possible utilization of rock-based geopolymers for permanent zonal isolation and well plugging''. IPTC-18454-MS presented at the international Petroleum Technology Conference (IPTC), Doha, Qatar.
  • Khalifeh, M., Saasen, A., Hodne, H., Vrålstad, T. 2013. ''Techniques and Materials for North Sea Plug and Abandonment Operations''. Offshore Technology Conference, Houston, 6-9 May.
  • Khalifeh, M., Saasen, A., Vrålstad, T., Hodne, H. 2014. ''Potential Utilization of Geopolymers in Plug and Abandonment Operations''. SPE 169231-MS presented at the SPE Bergen One Day Seminar.
  • Khalifeh, M., Saasen, A., Vrålstad, T., Larsen, H.B., Hodne, H. 2015. ''Cap rock restoration in plug and abandonment operations; Possible utilization of aplite-based geopolymers for permanent zonal isolation and well plugging''. SPE Offshore Europe Conference and Exhibition, Aberdeen.
  • Kullawan, K., Bratvold, R., Bickel, J.E. 2013. ''A Decision Analytic Approach to Geosteering Operations''. Paper SPE 167433 presented at the SPE Middle East Intelligent Energy Conference and Exhibition, Dubai, October 28-30.
  • Kullawan, K., Bratvold, R., Bickel, J.E. 2014. ''Value Creation with Multi-Criteria Decision Making in Geosteering Operations''. SPE Hydrocarbon Economics and Evaluation Symposium, Houston.
  • Linga, H., Torsvik, A., Oltedal, V.M., Saasen, A. 2016. ''Kick Detection Capability of Oil-based Muds in Well Control Situations''. Paper SPE-180039 presented for presentation at the SPE One Day Seminar, Bergen, April 20.
  • Linga, H., Bjørkevoll, K. S., Mortensen, H. Saasen, A. 2017. ''Gas influx in drilling fluid during flow check operation as affected by gas absorption characteristics of the drilling fluid. ''. SPE Drilling Conference in The Hague.
  • Liu, Y., Arntsen, B., Wapenaar, K., Romdhane, A. 2014. ''Inter-source seismic interferometry by multidimensional deconvolution (MDD) for borehole sources''. Bejing 2014 International Geophysical Conference & Exposition.
  • Liu, Y., Draganov, D., Wapenaar, K., Arntsen, B. 2015. ''Creating Virtual Receivers from Drill-bit Noise''. WS15-A02. In 77th EAGE Conference and Exhibition Workshop.
  • Liu, Y., Wapenaar, K., Arntsen, B. 2014. ''Turning Subsurface Noise Sources into Virtual Receivers by Multi-dimensional Deconvolution''. 76th EAGE Conference and Exhibition, Amsterdam.
  • Liu, Yi, Arntsen, B., Landrø, M., van der Neut, J., Wapenaar, K. 2016. ''New method for discriminating 4D time shifts in the overburden and reservoir''. SEG Technical Program Expanded Abstracts, Dallas, pp. 5521-5526.
  • Liu, Yi, Arntsen, B., van der Neut, J., Wapenaar, K. 2016. ''Auto-estimation of Up-down Wavefields in a Horizontal Borehole using Single Component Data''. 78th EAGE Conference and Exhibition, Vienna.
  • Lothe, A.E., Cerasi, P, Haavardstein, S., Bjørkevoll, K.S. 2017. ''Workflow for Uncertainty Modelling of Pore Pressure and Mud Weight Window ahead of Bit - Example of Pre-drill Results from the North Sea''. Prepared for presentation at EAGE Workshop on Pore Pressure Prediction,19-21 March, Pau, France.
  • Luo, X., Eliasson, P., Alyaev, S., Romdhane, A., Suter, E., Querendez, E., Vefring, E. 2015. ''An ensemble-based framework for proactive geosteering''. Proceeding of SPWLA Symposium, Long Beach, California, July 18-22.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad, T. 2014. ''An Investigation of Different Approaches for Probabilistic Cost and Time Estimation of Rigless P&A in Subsea Multi-Well Campaign''. Paper SPE 169203 presented at the SPE Bergen One Day Seminar, April 2.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad, T. 2014. ''Evaluating Cost Efficiency of Rigless P&A for Subsea Multiwell Campaign''. Paper IADC/SPE 167923 presented at the IADC/SPE Drilling Conference and Exhibition held in Fort Worth, Texas, 4–6 March.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad, T. 2015. ''Essential Aspects in Probabilistic Cost and Duration Forecasting for Subsea Multi-well Abandonment: Simplicity, Industrial Applicability and Accuracy''. Paper SPE-173850-MS presented at the SPE One Day Seminar, Bergen, April 22.
  • Opedal, N., Todorovic, J., Torsæter, M., Vrålstad, T., Mushtaq, W. 2014. ''Experimental Study on the Cement-Formation Bonding''. Paper SPE 168138-MS presented at the SPE International Symposium on Formation Damage Control, Lafayette, Louisiana, USA, 26–28 February.
  • Romdhane, A., Querendez, E. and Helset, H.M 2012. ''FWI for Sub-surface Imaging in the Context of Seismic while Drilling-Synthetic Study''. Presented at the 74th EAGE Conference & Exhibition, 4-7 June.
  • Skogestad J. O., Linga H., Bjørkevoll, K. S., Saasen, A.  2017. ''Predicting Gas Loading Capability in Oil-based Drilling Fluids.''. SPE Drilling Conference in The Hague.
  • Saasen, A., Fjelde, K.K., Vrålstad, T., Moeinikia, F. 2013. ''Plugging and Abandonment of Offshore Exploration Wells''. Paper OTC 23909 presented at the Offshore Technology Conference, Houston, 6-9 May.
  • Selvik, J.T., Abrahamsen, E.B. 2013. ''How to describe well barrier reliability: A SCSSV review study''. Presented at the COMDEM 2013 conference, Helsinki, June 11-13.
  • Siahaan, H., Bjorkvoll, K.S., Gravdal, J.E. 2013. ''Possibilities of Using Wired Drill Pipe Telemetry During Managed Pressure Drilling in Extended Reach Wells''. Paper SPE 167856 presented at the SPE Intelligent Energy Conference and Exhibition, Utrecht, April 1-3.
  • Skorpa, R., Vrålstad, T. 2015. ''Visualization and Quantification of Fluid Flow Through Degraded Cement Sheaths''. Paper SPE-180019-MS presented at the SPE One Day Seminar, Bergen, April 20.
  • Skorpa, R., Vrålstad, T. 2016. ''Visualization and Quantification of Fluid Flow Through Degraded Cement Sheaths''. Paper SPE-180019-MS, prepared for presentation at the SPE One Day Seminar, Bergen, April 20.
  • Suter, E., Cayeux, E., Escalona, A., Kårstad, T., Vefring, E.H.  2012. ''A Strategy for Effective Local Updates of the Geological Structure in an Earth Model during Drilling''. Extended abstract D035, presented at the 74th EAGE Conference and Exhibition incorporating SPE Europec 2012 in Copenhagen, Denmark, 4-7 June.
  • Suter, E., 2017. ''A Method for Multi-Scale Earth Modelling''. SPE Reservoir Simulation Conference Feb 20-22, Conference Center at La Torretta Montgomery, Texas, USA.
  • Suter, E., Friis, H.A., Vefring, E.H., Kårstad, T., Escalona, A. 2017. ''A novel method for multi-resolution earth model gridding''. SPE-182687-MS. Presented at the SPE Reservoir Simulation Conference held in Montgomery, TX, USA 20–22 February.
  • Torsvik, A., Myrseth, V., Linga, H. 2015. ''Drilling fluid rheology at challenging drilling conditions –an experimental study using a 1000 bar pressure cell''. presented at the Nordic Rheology Conference in Karlstad, Sweden, August 19-20. Paper published in Annual Transactions of the Nordic Rheology Society.
  • Torsvik, A., Skogestad, J.O., Linga, H.  2016. ''Impact on Oil-Based Drilling Fluid Properties from Gas Influx at HPHT conditions''. Paper IADC/SPE-178860 presented at the coming SPE Drilling conference in Fort Worth, TX, USA, March 1-3.
  • Torsæter, M., Opedal, N., Vrålstad, T., Vullum, P.E 2013. ''A Visual Journey into the 3D Chemical Nanostructure of Oilwell Cement''. Paper SPE 164105 presented at the SPE International Symposium on Oilfield Chemistry held in The Woodlands, Texas, USA, 8–10 April.
  • Valestrand, R., Khrulenko, A., Hatzignatiou, D.G. 2014. ''Smart Wells for Improved Water Management in the Presence of Geological Uncertainty''. Paper SPE 169223 presented at the SPE Bergen One Day Seminar, April 2.
  • Vrålstad, T., Skorpa, R., Opedal, N., De Andrade, J. 2015. ''Effect of thermal cycling on cement sheath integrity: Realistic experimental tests and simulation of resulting leakages''. SPE-178467-MS presented at the SPE Thermal Well Integrity and Design Symposium, Alberta, Canada, November 23-25.
  • Vrålstad, T., Todorovic, J., Saasen, A., Godøy R.  2016. ''Long-term Integrity of Well Cements at Downhole Conditions''. Paper SPE-180058-MS presented at the SPE One Day Seminar, Bergen, April 20.
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E-mail address: sigmund.stokka@iris.no
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