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Mature Fields: Leveraging Experience for Future Value

16 – 17 September 2013

Doha, State of Qatar | Sharq Village Hotel and Spa

Technical Agenda

Session 1: Prediction and Simulation

Session Chairs: Tajjul Ariffin, Qatar Petroleum; Øyvind Dugstad, Institute of Energy Technology [IFE]

Reliable production forecasts are a precursor to the implementation advanced new EOR techniques aimed at extending the life of mature fields. To achieve this it is vital to have a reservoir model that gives reliable production forecasts as large investments may be necessary to maintain production rates at economically viable levels. Successfully history matching the reservoir model to real production data will be imperative, but in many situations not sufficient to obtain a reliable evaluation of the consequences of employing various EOR techniques. Before starting large scale EOR operations, pilot testing should be carried out in the field. These tests should be evaluated by employing adequate simulation tools with state of art workflow in order to qualify a method that will successfully predict up-scaling of the pilot to a large-scale field operation.

The aims of the session are to discuss the available simulation tools and how to develop best practices for evaluating different EOR processes that are applicable across large-scale operations.

Session 2: Reservoir Monitoring and Validation

Session Chairs: Harlan Mulford, Baker Hughes; Øyvind Dugstad, Institute of Energy Technology

To reduce the levels of risk in production planning, it is critical to take advantage of various monitoring techniques. These techniques should allow validation of the reservoir model and be used to continuously update it as new insight is gained into the real performance of the reservoir. 4D seismic, pressure transient analysis, inter-well tracer tests, and geochemical analysis of produced fluids provide information about transport and communication between injection and production wells in the reservoir. Additional monitoring techniques such as PLT’s, DTS, inflow tracers, and permanent downhole monitoring technologies are aimed at measuring the production from various parts of the wells. All of these technologies can provide valuable information that can facilitate planning for further production from, and management of mature fields. The selection of the most appropriate monitoring methods will depend on a number of different reservoir and site conditions.

In this session field experiences, technical capabilities, the costs, and benefits of the various methods will be actively discussed to deepen participants’ understanding and provide a framework to share knowledge. There will also be opportunities to learn about new technologies under development that aim to address known challenges and chances to highlight new challenges on the horizon.

Session 3: Continuous Field Development

Session Chairs: Bipin Jain, Schlumberger; Olav Skår, Qatar Shell

As fields mature, efficient well construction becomes more important and also more challenging. Rewards per well reduce, while the level of risk subsurface and the density of wells required to achieve the production objectives increases. Well construction activities tend to command a higher share of the overall field spend be it on new wells or maintenance of the existing wells. In order to overcome these challenges, operators and service providers need to shift their emphasis from cost to value, focusing on partnerships and innovation to achieve the desired results.

The session aims to explore the key aspects of partnerships and collaboration. Furthermore, discussions will focus on some innovative operational methods and risk mitigation techniques which have been implemented to efficiently manage well construction both the during initial field development and throughout field life.

Session 4: Breakout Session

Session Moderators: Steering Committee

Session 5: Well Integrity

Session Chairs: Bipin Jain, Schlumberger; Morten Kvernvold, ScanWell

Verification of well integrity is a key area of interest and concern for oil and gas companies worldwide, particularly when dealing with mature fields. Well integrity is not only important for new wells, but is especially relevant to existing wells that may have been completed many years ago. In recent years, this issue has been brought into the spotlight due to high profile incidents of uncontrolled flows and cases of severe, sustained mismanagement of the natural environment. Public opinion is changing on how well the industry is managing well integrity and the long term impacts its activities may have. This comes at a time when the decline of conventional hydrocarbon resources are necessitating companies to expand into new, highly challenging arenas such as ultra-deep water and unconventional reservoirs. This together with the need to comply with tighter regulations has pushed the industry to look at well integrity concerns even more seriously. In the Middle East, the situation is complicated further due to the nature of the formations, many of which are shallow, prone to severe incidents of lost circulation, and have mineralogical conditions which contribute to highly corrosive brines.

This session aims to provide attendees with a better understanding of the challenges involved in ensuring well integrity, highlight recent technological developments and to offer a forum for sharing best practices.

Session 6: Well Intervention

Session Chairs: Ashok Srivastava, Schlumberger; Inge Manfred Carlsen, Weatherford

Mature fields by definition have wells that are old and have been in production for a long time. The advantage of sustained and effective monitoring can be lost if remedial action is not taken. Even the best of well designs cannot currently eliminate the eventual need for well intervention. Often the cost of intervention is prohibitive and the full set of advantages that well monitoring offers cannot be taken advantage of. In recent years, technologies have been introduced that allow well intervention that is fit for purpose. Modular rigs, coiled tubing, and wireline are increasingly becoming the norm instead of conventional workover rigs. Light well intervention vessels and mobile self-elevating platforms are being developed for this huge emerging market. Recently, wireline tractors that were primarily an option for conveyance in long horizontal wells have used for simple well interventions.

This session will address the possibility that rigless intervention and related technologies may be one of the key enablers to making mature fields economically sustainable.

Session 7: Sustaining Production

Session Chairs: Ashok Srivastava, Schlumberger; Inge Manfred Carlsen, Weatherford

Intelligent well systems are defined as completion systems which can measure and selectively control wellbore flow to ultimately increase recoverable reserves. The development of these technologies started in the 1990's and was primarily driven by the advent of deep water and subsea fields. Intelligent wells offer an alternative to high-cost well intervention and workover campaigns, yet the adoption and acceptance of these technologies has been slow. The long term reliability of critical components of these systems has been questioned over the lifespan of the wells. Installation and maintenance costs have been perceived as too high as compared to conventional completions. However, the value of intelligent wells is becoming better recognised particularly as technologies have improved, becoming more reliable, less expensive, and more flexible. In mature fields such technologies are becoming an important addition to the existing infrastructure in place. Effective utilisation of existing, ageing infrastructure is a crucial component of achieving economically sustainable production from mature fields. Prolonging the operating life of the infrastructure provides increased income opportunities and delays the costs of abandonment and decommissioning. As production declines, the production rates may drop significantly below the original design capacity while operating costs for the assets continue to rise. Rationalisation and more efficient use of the infrastructure must be allied to tie-in additional reserves. Integrated drilling, reservoir and production management, and the introduction of new technologies have made it possible to recover more reserves from both original and adjacent fields.

This session will present recent advancements in production enhancing, intelligent well technologies together with the effective use of existing infrastructure to open discussions on how best to achieve sustainable production from mature fields.

Session 8: Breakout Session

Session Moderators: Steering Committee