DRILLWELL PAPERS


JOURNAL PAPERS:
  • Abrahamsen, E.B. and Selvik, J.T. 2014. “A framework for selection of inspection intervals for well barriers”. Presented at ESREL conference London, 29 Sept – 2 Oct 2013, Safety, Reliability and Risk Analysis: Beyond the Horizon – Steenbergen et al. (Eds), Taylor & Francis Group, London, ISBN 978-1-138-00123-7.
  • 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". Journal of Natural Gas Science and Engineering, Volume 32, May 2016, Pages 439–452.
  • Assembayev, D., Myrseth, V., Werner, B., Gyland, K.R., Saasen, A., Ibragimova, Z., Ytrehus, J.D. 2015. "Establishing an experimental pre-conditioning procedure for rheological characterization of oil based 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.
  • Cayeux, E., Mesagan, T., Tanripada, S., Zidan, M. and 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.
  • Chen, Y., Lorentzen, R.J. and Vefring, E.H. 2014. “Optimization of Well Trajectory Under Uncertainty for Proactive Geosteering”. SPE-172497-PA. SPE Journal.
  • De Andradee, J., Sangesland, S. 2016. "Cement Sheath Failure Mechanisms: Numerical Estimates to Design for Long-Term Well Integrity". Journal of Petroleum Science and Engineering, 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". Published online 31. Aug. in Journal of Petroleum Science and Engineering.
  • Gelyani, A.M.,   Selvik, J.T. and Abrahamsen. E.B. 2014. “Decision criteria for updating test intervals for well barriers”. Journal of risk research.
  • Hatzignatiou, D.G., Askarinezhad, R., Giske, N. and Stavland, A. 2016. “Laboratory Testing of Environmentally Friendly Sodium Silicate Systems for Water Management Through Conformance Control”, SPE-173853-PA, SPE Production & Operations Journal, Vol. 31, Issue 4, pp337-350.
  • Johansen, T.A., Sui, D. and Nybø, R. 2013. “Regularized Nonlinear Moving Horizon Observer with Robustness to Delayed and Lost Data”. IEEE transactions on control systems technology.
  • 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., Vrålstad, T. and Hodne, H. 2014. “Potential Utilization of Class C Fly ash-based Geopolymer in Oil Well Cementing Operations”. Cement and Concrete Composites 53, p. 10-17, Elsevier.
  • Khalifeh, M., Saasen, A., Vrålstad, T., Larsen, H.B. and Hodne, H. 2015. “Experimental study on the synthesis and characterization of aplite rock-based geopolymers”. Journal of Sustainable Cement-Based Materials.
  • Kullawan, K., Bratvold, R. , Nieto, C.M., 2016. "Decision-Oriented Geosteering and the Value of Look-Ahead Information: A Case-Based Study". Published online in Spe Journal, October 2016
  • Kullawan, K., Bratvold, R. and Bickel, J.E. 2014. “A Decision Analytic Approach to Geosteering Operations”. SPE Drilling & Completions Journal, Vol. 29, No. 1.
  • Lavrov, A., Larsen, I. and Bauer, A. Jan 2015. "Numerical modeling of extended leak-off test with a pre-existing fracture". Journal of Rock Mechanics and Geotechnical Engineering, April 2016, Vol 49, Issue 4, p1359-1368. ISSN 0723-2632.
  • 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.
  • Liu, Y., Draganov, D., Wapenaar, K. and Arntsen, B. 2015. “Retrieving virtual reflection responses at drill‐bit positions using seismic interferometry with drill‐bit noise”. Geophysical Prospecting, Vol. 63.
  • Moeinikia, F., Fjelde, K.K., Saasen, A., Vrålstad T 2015. “Probabilistic Cost and time Estimation of Rigless Plug and Abandonment”. JPT Journal, January 2015, based on the paper “An Investigation of Different Approaches for Probabilistic Cost and Time Estimation of Rigless P&A in Subsea Multi-Well Campaign”. SPE 169203 presented at the SPE Bergen One Day Seminar April 2.
  • Moeinikia, M., Fjelde, K.K., Saasen, A., Vrålstad, T. and 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. and Helset, H.M. 2012. “FWI for Sub-surface Imaging in the Context of Seismic while Drilling-Synthetic Study”, EAGE Conference & Exhibition.
  • Zhou, J., Krstic, M. 2016. "Adaptive Predictor Control for Stabilizing Pressure in a Managed pressure Drilling System under Time-delay", Journal of Process Control, Vol 40, April 2016, pp 106-118.
  • 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
  • Aarsnes, U.J.F., Flåtten, T. and 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., Acikmese, B. and Ambrus, A. and Aamo, O.M. 2016. "Robust Controller Design for Automated Kick Handling in Managed Pressure Drilling". Journal of Process Control, vol 47, Nov 2016, 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.
 

CONFERENCE PAPER WITH REVIEW:
  • Cayeux, E. and Skadsem, H.J. 2014. “Estimation of weight and torque on bit: Assessment of uncertainties, correction and calibration methods”. Paper OMAE2014-23866 presented at the ASME 2014 International Conference on Ocean, Offshore and Arctic Engineering, OMAE2014, San Francisco, California, June 8-13.
  • De Andrade, J. Sangesland, S., Vrålstad, T. and Golan, M. 2014. “Cement sheath integrity implications of scaled-down wellbore casing-cement-formation sections”. Paper OMAE2014-24266 presented at the ASME 2014 International Conference on Ocean, Offshore and Arctic Engineering, OMAE2014, San Francisco, California, June 8-13.
  • Ghauri, A.A., Fjelde, K.K. and Frøyen, J. 2016. “A Transient Model for Hydraulic Simulation of Bullheading and Pressurized Mud Cap Drilling”. Paper OMAE2016-54293 presented at the ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering OMAE2016 June 19 - 24, Busan, Korea.
  • Iversen, F., Thorogood, J.L., Macoerhson, J.D., Macmillan, R. 2016. "Business Models and KPIs as Drivers for Drilling Automation". SPE Intelligent Energy International Conference and Exhibition, 6-8 September, Aberdeen, Scotland, UK.
  • Liu, Y., Arntsen, B., Wapenaar, K. and van der Neut, J. 2014. “Combining inter-source seismic interferometry and source-receiver interferometry for deep local imaging”. Presented at the Society of Exploration Geophysicists (SEG) conference, Denver, 2014, SEG Technical Program Expanded Abstracts 2014, pp. 5107-5112.
  • Liu, Y., van der Neut, J., Arntsen, B. and Wapenaar, K. 2015. “Data-driven deep local imaging using both surface and borehole seismic data”. Presented at the Society of Exploration Geophysicists (SEG) conference, New Orleans, SEG Technical Program Expanded Abstracts 2015: pp. 5554-5559.
  • Moeinikia, F., Fjelde, K.K., Sørbø, J., Saasen, A. and Vrålstad, T. 2015. “A Study of Possible Solutions for Cost Efficient Subsea Abandonment”. Paper OMAE2015-41261 presented at ASME 2015 International Conference on Ocean, Offshore and Arctic Engineering, OMAE2015, St. John’s, Newfoundland.
  • Myrseth, V.O., Werner B., Lund B., Saasen A., Ytrehus J.D. 2015. "Rheological properties of oil based drilling fluids and base oils". Presented at ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering, Volume 10: Petroleum Technology, St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Sayindla, S., Lund, B., Taghipour, A., Werner, B., Saasen, A., Gyland, K.R., Ibragimova, Z. and Ytrehus, J.D. 2016. "Experimental investigation of Cuttings Transport with Oil Based Drilling Fluids".  The 35th International Conference on Ocean, Offshore and Arctic Engineering, June 19-24, 2016, Busan, South Korea.
  • Werner, B., Oltedal, V. M., Lund, B., Saasen, A., Ibragimova, Z., Ytrehus, J.D. and Gyland, K.R. 2016. "Effects of Oil-Based Drilling Fluid Rheological Properties on Hole Cleaning Performance". The 35th International Conference on Ocean, Offshore and Arctic Engineering, June 19-24, 2016, 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", Presented at ASME 2015, 34th International Conference on Ocean, Offshore and Arctic Engineering, Volume 10: Petroleum Technology, St. John’s, Newfoundland, Canada, May 31–June 5, 2015
 

CONFERENCE WITH PAPER:
  • Aas. B., Sørbø, J., Stokka, S., Saasen A., Godøy, R., Lunde, Ø. and Vrålstad, T. 2016. “Cement Placement with Tubing Left in Hole during Plug and Abandonment Operations”. Paper prepared for presentation 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”. Presented at ESREL conference, London, 29 Sept – 2 Oct.
  • Albawi, A., De Andrade, J., Torsæter, M., Opedal, N., Stroisz, A. and Vrålstad, T. 2014. “Experimental Set-Up for Testing Cement Sheath Integrity in Arctic Wells”. Paper OTC 24587 presented at the Arctic Technology Conference, Houston, Texas, USA, 10-12 February.
  • 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 Society of Core Analysts, Colorado, USA, 21-26 August.
  • Askarinezhad, R., Hatzignatiou, D.G., and Stavland, A., 2016. “Disproportionate Permeability Reduction of Water-Soluble Silicate Gelants – Importance of Formation Wettability”. Paper SPE 179589-MS to be presented at the SPE Improved Oil Recovery Conference, Tulsa, Oklahoma, April 9-13.
  • Bjørkevoll, K.S., B. Daireaux and P.C. Berg. 2015. “Possibilities, Limitations and Pitfalls in Using Real-Time Well Flow Models During Drilling Operations”. Paper SPE-173858-MS presented at the SPE One Day Seminar, Bergen, April 22.
  • Cayeux, E., Daireaux, B., Balov, M.K., Haavardstein, S., Stokland, L.M. and Saasen, A. 2016. "Automatic Performance Analysis and Estimation of Risk Level Embedded in Drilling Operation Plans". Paper SPE-181018 presented at the SPE Intelligent Energy International Conference and Exhibition held in Aberdeen, United Kingdom, 6–8 September.
  • Cayeux, E., Leulseged, A., Kluge, R. and 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 prepared for presentation at the SPE Drilling conference in Fort Worth, TX, USA, March 1-3.
  • Cayeux, E., Skadsem, H.J. and Kluge, R. 2015. "Accuracy and Correction of Hook Load Measurements DuringDrilling Operations". Paper SPE/IADC-173035-MS presented at the SPE/ADC Drilling conference and exhibition, London, March 17-19.
  • Cayeux, E., Daireaux, B., Dvergsnes, E.W., Siahaan, H. and Gravdal, J.E. 2014.  "Principles and Sensitivity Analysis of Automatic Calibration of MPD Methods Based on Dual-Gradient Drilling Solutions". Paper SPE 170330 presented at the SPE Deepwater Drilling and Completions Conference held in Galveston, Texas, USA, 10–11 September.
  • Cayeux, E. and Lande, H.P. 2013. “Factors influencing the estimation of downhole pressure far away from measurement points during drilling operations”. Presented at 54rd SIMS conference on Simulation and Modelling, in Bergen, October 16-18.
  • 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”. Paper SPE-163492-MS presented at SPE/IADC, Amsterdam, 5-7 March.
  • Chen, Y., Lorentzen, R.J. and Vefring, E.H. 2012. “Optimization of Well Trajectory under Uncertainty for Proactive Geosteering”. Paper A40 presented at the ECMOR XII-13th European Conference on the Mathematics of Oil Recovery, 10 - 13 September, Biarritz, France.
  • Chen, Y., Luo, X. and Vefring, E.H. 2014. “On bias correction for parameter estimation problems with applications to model updating for geosteering”. Presented at the ECMOR XIV-14th European conference on the mathematics of oil recovery at Catania, Sicily, Italy, September 8-11.
  • 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 Andrade, J., Torsæter, M., Todorovic, J., Opedal, N., Stroisz, A. and Vrålstad, T. 2014. “Influence of Casing Centralization on Cement Sheath Integrity During Thermal Cycling”. Paper IADC/SPE 168012 presented at the IADC/SPE Drilling, Fort Worth, Texas, USA, 4–6 March.
  • Fjelde, K.K., Frøyen, J., and Ghauri, A.A. 2016. “A Numerical Study of Gas Kick Migration Velocities and Uncertainty”. Paper prepared for presentation at the SPE One Day Seminar, Bergen, April 20.
  • Flatebø, G.Ø., Torsvik, A., Oltedal, V.M., Bjørkvik, B., Grimstad A.A. and Linga, H. 2015. “Experimental Gas Absorption in Petroleum Fluids at HPHT Conditions”. Paper SPE-173865-MS presented at the SPE One Day Seminar, Bergen, April 22.
  • Gravdal, J.E., Siahaan, H. and Bjørkevoll, K.S. 2014. "Back-Pressure Managed Pressure Drilling in Extended-Reach Wells – Limiting factors for the ability to achieve accurate pressure control". Paper SPE 169211 presented at the SPE Bergen One Day Seminar, April 2.
  • Hatzignatiou, D.G., Askarinezhad, R., Giske, N.H. and Stavland, A. 2015. “Laboratory Testing of Environmentally Friendly Chemicals for Water Management”. Paper SPE-173853-MS presented at the SPE One Day Seminar, Bergen, April 22.
  • Khalifeh, M., Hodne, H., Korsnes, R.I. and Saasen, A. 2015.  “Cap rock restoration in plug and abandonment operations; Possible utilization of rock-based geopolymers for permanent zonal isolation and well plugging”. Paper IPTC-18454-MS presented at the International Petroleum Technology Conference (IPTC), Doha, Qatar, December 7-9.
  • Khalifeh, M., Saasen, A., Hodne, H. and Vrålstad, T. 2013.  “Techniques and Materials for North Sea Plug and Abandonment Operations”. Paper OTC 23915 presented at the Offshore Technology Conference, Houston, 6-9 May.
  • Khalifeh, M., Saasen, A., Vrålstad, T. and Hodne, H. 2014. “Potential Utilization of Geopolymers in Plug and Abandonment Operations”. Paper SPE 169231-MS presented at the SPE Bergen One Day Seminar April 2.
  • Khalifeh, M., Saasen, A., Vrålstad, T., Larsen, H.B. and Hodne, H. 2015. “Cap rock restoration in plug and abandonment operations; Possible utilization of aplite-based geopolymers for permanent zonal isolation and well plugging”. Paper SPE-175457-MS presented at SPE Offshore Europe Conference and Exhibition, Aberdeen, UK, September.
  • Kullawan, K., Bratvold, R. and 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.B. and Bickel, J.E. 2014. “Value Creation with Multi-Criteria Decision Making in Geosteering Operations”. Paper SPE169849 presented at the SPE Hydrocarbon Economics and Evaluation Symposium held in Houston, 19-20 May.
  • Linga, H., Torsvik, A., Oltedal, V.M. and Saasen, A. 2016. “Kick Detection Capability of Oil-based Muds in Well Control Situations”. Paper prepared for presentation at the SPE One Day Seminar, Bergen, April 20.
  • Liu, Y., Arntsen, B., Wapenaar, K. and Romdhane, A. 2014. “Inter-source seismic interferometry by multidimensional deconvolution (MDD) for borehole sources”. Presented at the Beijing 2014 International Geophysical Conference & Exposition, Beijing, China, April 21-24.
  • Liu, Y., Draganov, D., Wapenaar, K. and Arntsen, B. 2015. “Creating Virtual Receivers from Drill-bit Noise”. WS15-A02. In 77th EAGE Conference and Exhibition-Workshops, June.
  • Liu, Y., Wapenaar, K. and Arntsen, B. 2014. “Turning Subsurface Noise Sources into Virtual Receivers by Multi-dimensional Deconvolution”. Presented at the 76th EAGE Conference and Exhibition, Amsterdam, June.
  • Luo, X., Eliasson, P., Alyaev, S.,   Romdhane, A., Suter, E., Querendez, E. and Vefring, E.H. 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. and 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.
  • Moeinikia, F., Fjelde, K.K., Saasen, A. and 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. and 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.
  • Opedal, N., Todorovic, J., Torsæter, M., Vrålstad, T. and 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.
  • Saasen, A., Fjelde, K.K., Vrålstad, T. and 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. and 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.B., Bjørkevoll, K.S. and Gravdal, J.E. 2014. “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. and Vralstad, T., "Visualization and Quantification of Fluid Flow Through Degraded Cement Sheaths". Paper SPE-180019-MS, presented at the SPE One Day Seminar, Bergen, April 20, 2016.
  • Suter, E., Cayeux, E., Escalona, A., Kårstad, T. and 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.
  • Torsæter, M., Opedal, N., Vrålstad, T. and P. E. 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.
  • Torsvik, A., Myrseth, V. and 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. and Linga, H. 2106. “Impact on Oil-Based Drilling Fluid Properties from Gas Influx at HPHT conditions”. Paper prepared for presentation at the coming SPE Drilling conference in Fort Worth, TX, USA, March 1-3.
  • Valestrand, R., Khrulenko, A. and 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., Todorovic, J., Saasen, A. and Godøy R. 2016. "Long-term Integrity of Well Cements at Downhole Conditions". Paper SPE-180058-MS, prepared for presentation at the SPE One Day Seminar, Bergen, April 20.
  • Vrålstad, T., Skorpa, R., Opedal, N.  and 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.
  • Aarsnes, U.J.F., Hauge, E. and Godhavn, J.-M. 2016. "Mathematical Modeling of Gas in Riser". Presented at SPE Deepwater Drilling & Completions Conference held in Galveston, Texas, USA, 14–15 September 2016.
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DRIllwell - Drilling and well centre for improved recovery