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Aberdeen, United Kingdom

Purvis B.,Total E and P UK Ltd
Proceedings of the Biennial International Pipeline Conference, IPC | Year: 2010

This paper will discuss both the present situation and future developments in Pipeline Integrity Monitoring. It will also highlight how integrity monitoring is a vital part of any Pipeline Integrity Management System (PIMS). To give the true picture of a pipeline's condition, the integrity monitoring systems must identify those elements of the pipeline which are at most risk to any potential modes of failure. Pipeline integrity monitoring offshore tends to be the periodic monitoring of specified components above and below the water surface. This being in the form of long and short term monitoring programs, which are derived from threat identification, risk assessment and mitigation processes. These programs normally follow the relevant industry standards that define specific monitoring activities and frequencies, especially for the safety critical components. PIMS documentation review cycles can be long and complex, but should be undertaken on a regular basis. When these reviews are undertaken they don't always use new data sources that could give us more information about potential failure modes. At present these processes tend to be more reactive or lagging in nature. The future monitoring of pipeline integrity should be more forward-looking and be proactive as well as being reactive. Where are the next major developments? We need to make better use of the data we have by studying trends, changes and impacts wherever possible. Also, have a better understanding of the in-service behaviour and how this can change over the life cycle of a pipeline system. Copyright © 2010 by ASME. Source

Lawson B.,Total E and P UK Ltd
Society of Petroleum Engineers - SPE/APPEA Int. Conference on Health, Safety and Environment in Oil and Gas Exploration and Production 2012: Protecting People and the Environment - Evolving Challenges | Year: 2012

This paper will explain the process and practices involved in managing Asset Integrity within the context of the UKCS, one of the most regulated environments of the world. The paper will explain the following main areas: 1 The workings of Asset integrity within an major oil and gas company operating in the N Sea, including illumination of the processes that we have developed over the last seven years to assess the risks of the threats that we face in order to validate and prioritise the works. 2 We have undertaken ageing and life extension studies and the paper will discuss the methodology used, the outcomes and the results in relation the UK regulators programme to assess the understanding of Oil and Gas companies in relation to ageing and life extension. The processes and tools explained in the paper will be transferable to any operator or duty holder looking to establish or improve an Asset Integrity function around the world. In terms of achievements, the processes that we have in place both demonstrates that we are managing the risks that we encounter as well as senior management involvement and leadership on the issues. With regard to life extension, as a result of the ageing studies that we undertook we have moved on from study and assessment into the implementation phase of the required works that will enable us to operate one of our facilities for 20 years in excess of the original design life. The author is a member of the Asset Integrity Workgroup in Stepchange in Safety and has presented on elements of Asset Integrity at numerous seminars in the UK in recent years. Most recently I was also invited to participate as a member of the panel session on Ageing and Life Extension at Offshore Europe 2011 in Aberdeen. Copyright 2012, SPE/APPEA International Conference on Health, Safety, and Environment in Oil and Gas Exploration and Production. Source

Mainguy M.,Total E and P UK Ltd | Mainguy M.,Total S.A.
International Journal of Rock Mechanics and Mining Sciences | Year: 2016

Approximately thirty Multi-Finger Calliper (MFC) surveys have been acquired in Elgin and Franklin development wells between 2003 and 2013. These surveys reveal around one hundred shear deformation features characterized by a kink in the pipe. The calliper surveys were depth shifted against the open-hole reference depth used in Geoscience to accurately identify the interfaces along which the deformations occur. The deformations have been found to be distributed at the top of the Fulmar Formation reservoir, in the Late Jurassic shales, in the Early Cretaceous Cromer Knoll Group, and the Late Cretaceous Chalk Group. For each deformation feature, the relative displacement of the well was estimated using the calliper tool eccentricity resulting from the movement of the toolstring through the kink in the pipe. Maximum relative displacements were estimated at 3.7 in. in the 7 in. liner and at 1.2 in. in the 9 7/8 in. production casing. The analysis of the calliper surveys show that the deformation features result from slip displacements along various discontinuities such as bedding planes, reservoir faults extending in the overburden, and overburden faults. It is interpreted that these interfaces have been reactivated because of the strong reservoir depletion. This work clearly demonstrates that MFC surveys are an effective tool for monitoring shear deformations occurring above a compacting reservoir. © 2016 Elsevier Ltd. Source

Kachuma D.,Total E and P UK Ltd
ECMOR 2010 - 12th European Conference on the Mathematics of Oil Recovery | Year: 2010

The use of complex corner point systems in field flow reservoir simulators allows the modelling of a wider variety of cell geometries and hence a better representation of faulted reservoirs. If faults are involved, then a cell face may be next to two or more cell faces. This phenomenon can also be observed in situations where the cells in a particular region have been refined to improve accuracy. This creates complex connections between cell faces which require special attention and representation within the simulator. Conventionally, this is handled by the use of the so-called non-neighbour connections (NNC) whereby the simulator includes, on top of the regular neighbour fluxes, the fluxes between the extra cell connections. We present a robust technique which is applicable regardless of the flow configuration. Our technique involves subdividing each cell with non-neighbour fluxes into a local regular subgrid. Using this grid the local streamfunction is constructed numerically. By reducing the size of the local subgrid, the accuracy of the traced streamlines improves. We demonstrate this technique first on a detailed 2D synthetic example that is designed to show the robustness of the technique. The practical utility of our algorithm is then demonstrated in a structurally complex and heavily faulted full model of a North Sea field which includes cells with several nonneighbour configurations in different faces. This treatment is contrasted with the usual approach and also other techniques designed to trace streamlines in heavily faulted systems. Source

Thore P.,Total E and P UK Ltd
75th European Association of Geoscientists and Engineers Conference and Exhibition 2013 Incorporating SPE EUROPEC 2013: Changing Frontiers | Year: 2013

I present a classification of Seismic Inversions in two categories; Data Driven and Model Based. Based on examples I show that no inversion is purely data driven and that the user has to provide prior information which constrains the solution to a certain behavior. On the other hand, Model Based Inversion can provide very appealing results (an example breaks the traditional view of seismic resolution) provided that the underlying model is sound. I conclude by proposing a workflow which tries to get the best from both approaches. Copyright © (2012) by the European Association of Geoscientists & Engineers All rights reserved. Source

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