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Technical Programme

Thursday, 15 May, 0830–0900

Keynote Speaker

Stephen Heath
Nalco Champion, an Ecolab Company

Squeezing Sub-Sea Wells Co-Mingled in the Same Flowline on the Norne Field

An essential part of any scale squeeze-management strategy for an oilfield is the capability to accurately and precisely determine residual scale inhibitor concentrations as part of a scale squeeze-management programme. For subsea wells co-mingled in the same flowline, this presents a challenge compounded by the trend of recent years where the use of environmentally friendly polymeric scale squeeze inhibitors has increased. In this keynote address, details of new analysis techniques for these novel scale inhibitor methods in the Norne field will be explored. Data will be presented for squeezing three subsea wells comingled in the same flowline with three different polymeric scale squeeze inhibitors, namely, a phosphorus-containing polyamine, a quaternary amine terpolymer and a phosphorus tagged sulphonated copolymer all in the presence of the wellhead/topside carboxylate copolymer. The implications of different detection limits for the three different polymers on the individual well treatment lifetimes and re-squeeze frequency will also be discussed.


Session 5: Current Practice for Unconventional Scale and Scale Control

Room: Gordon A

Session Chairs: Ping Chen, Nalco Champion, an Ecolab Company and Hua Guan, OneSubsea

The focus of this session will be on both practical experiences and theoretical studies on unconventional sulphide and calcium naphthenate scale control. The session will have two separate topics: the geochemical reaction occurring during shale fracturing and the impact with produced water reuse on scaling, and the method of using a chemical additive to increase the inhibitor squeeze life and modelling its behaviour.



Sulfide Scale Control in Produced Water Handling and Injection Systems: Best Practices and Global Experience Overview
J.J. Wylde, Clariant Oil Services



Calcium Naphthenates in Complex Production Systems - Evaluation and Chemical Inhibition Challenges
D.A. Nichols, Scaled Solutions Ltd; F.F. Rosario, M.C. Bezerra, Petrobras; S.E. Gorringe, H. Williams, G.M. Graham, Scaled Solutions Ltd



Sulphide Scale (PbS/ZnS) Formation And Inhibition Tests For A Gas Condensate Field with Severe Scaling Conditions
C. Okocha, K.S. Sorbie, Heriot-Watt University; C. Hurtevent, S. Baraka-Lokmane, Total France; M. Rossiter, Total E&P UK


Session 6: Emerging Innovation for Unconventional Scale Management

Room: Gordon A

Session Chairs: Hamad Al-Saiari, Saudi Aramco and Huey-Jhy Chen, Chevron ETC

Guest Chair: Mohammed Al-Khaldi, Saudi Aramco Exploration Advanced Research Center

This session on unconventional scale management focuses on two main subject areas. The first is sulphide scale control where we will explore test methodologies for evaluation of chemistries in the laboratory environment and how these can improve field condition estimations. In this discussion a class of novel inhibitors which could provide an industry breakthrough in control of this highly insoluble and challenging scale will be discussed. Another subject covered is the unconventional use of scale inhibitor species together in innovative synergy identification between polymer and phosphonate species that can provide new insights into the formulation of bespoke scale inhibition solutions.



Sulfide Scale Control: A High Efficacy Breakthrough Using an Innovative Class of Polymeric Inhibitors
A.J. Savin, B. Adamson, J.J. Wylde, J.R. Kerr, Clariant Oil Services; C.W. Kayser, T. Trallenkamp, D. Fischer, Clariant Production (D) GmbH; C. Okocha, Heriot Watt University



Synergistic Properties of Phosphonate and Polymeric Scale Inhibitor Blends for Barium Sulphate Scale Inhibition
S.S. Shaw, K.S. Sorbie, Heriot-Watt University



Mechanisms, New Test Methodology and Environmentally Acceptable Inhibitors for Co-deposition of Zinc Sulfide and Calcium Carbonate Scales for High Temperature Application
C. Tortolano, T. Chen, Nalco Champion, An Ecolab Company; L. Zou, Imperial College; P. Chen, H.T. Montgomerie, T. Hagen, R. Benvie, Nalco Champion, An Ecolab Company


Session 7: Innovative Developments in Scale Management

Room: Gordon A

Session Chairs: Olav Martin Selle, Statoil ASA and Anne Neville, University of Leeds

Guest Chair: Amare Mebratu, Halliburton

The need for progressing state-of-the-art scale management is well exemplified in this session in which presentations focus on improvements in design and implementation of scale inhibitors. Squeeze applications in fractured reservoirs will be discussed as well as how to better predict behaviour and therefore design parameters. The session will also cover advancement in the prediction of scale formation and how the kinetics of calcite scale is influenced by the presence of calcium and bicarbonate ions. Finally a review of downhole injection equipment will be given, including lessons learned on the parameters critical to appropriate selection of equipment for delivery assurance of scale inhibition.



Improving Scale Inhibitor Squeeze Design for Naturally Fractured Reservoirs
V.E. Spooner, R. Stalker, R.J. Wright, G.M. Graham, Scaled Solutions Limited



Influence of Calcium and Bicarbonate Ions on the Kinetics of CaCO3 Formation at HTHP in the Absence and Presence of Scale Inhibitors
B. Xu, SouthWest Petroleum University; T. Chen, P. Chen, H.T. Montgomerie, T.H. Hagen, Nalco Champion, an Ecolab Company; Q. GUO, X. Yang, Southwest Petroleum University



Qualification of Downhole Valves Used in Continuous Injection Systems
C. Stewart-Liddon, N. Goodwin, G.M. Graham, Scaled Solutions Ltd; T. Tjomsland, B.M. Hustad, O.G. Svela, J.H. Olsen, S. Østgaard, Statoil ASA


Session 8: Innovative Solutions to Scale Control II

Room: Gordon A

Session Chair: Salima Baraka-Lokmane, Total and Annabelle Molliet, Baker Hughes

When oil and gas production moves into technologically challenging environments such as deepwater, arctic, or unconventional production, the industry needs robust scale control programmes. Often, the environment associated with such production is very different from that of conventional production. For example, unconventional treatment methods are needed to treat scale formation in downhole completion equipment at remote production sites, with vast quantities of water, for different mineral deposits, and at extreme high or low temperatures. These new scale challenges require innovative chemical and physical solutions. Papers in this section focus on providing such innovative solutions for scale control in extreme conditions. New understanding of scale formation and inhibition and new tools to prevent scale adhesion will be discussed in this session.



Evaluation of Anti-fouling Surfaces for Prevention of Mineral Scaling in Sub-Surface Safety Valves
T.V. Charpentier, A. Neville, University of Leeds; S. Baraka-Lokmane, C. Hurtevent, J. Ordonez-Varela, Total; F. Moeller Nielsen, V. Eroini, J.H. Olsen, Statoil; J. Ellingsen, O. Bache, ConocoPhillips



Development of Novel Test Methodology to Understand the Mechanisms of Halite Inhibition and Environmentally Acceptable Halite Scale Inhibitors for High Temperature Application
K. Ho, T. Chen, P. Chen, T. Hagen, H.T. Montgomerie, R. Benvie, Nalco Champion, An Ecolab Company



Qualification of Chemicals / Chemical Injection Systems for Downhole Continuous Chemical Injection
C. Stewart-Liddon, N. Goodwin, G.M. Graham, Scaled Solutions Ltd; T. Tjomsland, B.M. Hustad, O.G. Svela, J.H. Olsen, S. Østgaard, Statoil ASA