TX 75083-3836, U.S.A., fax +1-972-952-9435. AbstractField development, operation optimization, production system de-bottlenecking, reservoir management and field re-development involve studies and analyses from multidiscipline engineers and experts that require effective communication of the impact of the results from one discipline to another. Through an integrated subsurfaceto-surface-to-economic modeling technology, the team members are able to model all components of the production system simultaneously and evaluate potential development scenarios, thus resulting in optimal decisions. The Integrated Asset Modelling technology integrates reservoirs, wells, surface infrastructure, and process facilities as well as the asset's operating parameters, financial metrics, and economic conditions into a single production management environment.
Samarang is a 35-year-old offshore oilfield in Malaysia, operated by Petronas. By 2003, with the declining production trends anddwindling reserves, the field abandonment was on the horizon. SamarangRedevelopment Project was kicked-off in 2012 with a vision to implementIntegrated Operations (IO) as an Asset Management Decision Support tool byimplementing a real time production, reservoir and process surveillance system. For the IO implementation, various intelligent asset decisionprocesses referred as workflow were identified and in various reservoir, production, and operations domains suchas Flow Assurance, Well Performance, Artificial Lift, Production and facilityPlanning and EOR Optimization. These workflow groups are linked to provide an integrated asset decision support system whichwill improve decision quality and operational efficiency. workflowm will deliver value with enhanced asset management by focusing on decisions toimprove reservoir drainage, production, and operations. In the initial phase, well performance workflow group, by acquiring data from the SCADA system andprocessing the real-time analysis workflows, enables the asset team to movefrom a reactive to a pro-active asset management system. ‘Well Status andUptime Calculation’ and ‘Well Rate Estimation’ workflow enable engineers to know in real-time the performance andstatus of wells to reduce the production deferment. The ‘Well Test Validation’ workflow will provide online validation, enhanced test quality andimproved confidence in back-allocation and reservoir modeling leading to betterField Management. ‘GasLift Surveillanceand Optimization’ workflow monitorslift performance, performs diagnostics and optimizes gaslift distribution. UsingReal Time data and integrated software, this solution will enable efficientdecisions with a shorter turnaround timeThus workflows equipthe asset team with cutting edge technology and collaborationenvironment for operational decision making. The IO implementation will help to extend the fieldlife and increase recoverable reserves while facilitating an effectivereservoir management strategy.
Samarang field is located offshore Sabah, East Malaysia with first oil in 1975. Majority of the platforms are provided with fully pneumatic instrumentation / control and shutdown systems, with no provision for remote monitoring/control. This has caused limitation in acquiring data for monitoring and analyzing hence optimizing the asset. The field is undergoing a major redevelopment project with Integrated Operations (IO) being part of initiatives that covers re-instrumentation, telemetry and telecommunication infrastructure installation, Collaborative Working Environment construction and Workflows implementation. The limitation of status quo instrumentation situation has posed challenges for Samarang asset to monitor flowing status of the wells. Consequently, a number of indirect inferences were being used to determine the status and uptime of the wells including sporadic well head observation (i.e. "feeling" or "touching" the well head assembly for vibrations) and well head fluid sampling. Added to the complexity is the flow from multiple strings and wells commingling in production headers in each of the well platforms, it is not uncommon to have cases wherein the individual string or well’s actual status and production contribution is unknown for many days (or even weeks). At best, Well Testing, which is a direct measurement of the well or string’s deliverability, is carried out once a month. This paper describes a novel methodology of implementing workflow to achieve continuous well status monitoring objective. Workflow that combines the data feeding and processing through data driven logics as well as well models driven logics has enabled continuous well status awareness. The workflow has enabled the followings: Continuous well rate estimation using nodal analysis well model by automating data input and result output processWell flowing or quitting status inference by using wellhead pressure, temperature, valve status, gas lift injection pressure, MIG, pump voltage and frequency for natural, gas lifted as well as ESP wellsAutomated notification of well status through Tri-node Collaborative Working EnvironmentFaster reaction and decisionReduction of production deferment and increase awareness to the well status and performance
Integrated Operations (IO) was indentified as part of the redevelopment program in Samarang field. The IO framework defined was focusing on Asset Management Decision Support through increasing levels of monitoring and surveillance; fast, medium and slow loop diagnosis, transformation of operations, and optimization of asset values.The aim of Samarang IO is to achieve the followings: Effective and efficient working environment through streamlined and automated workflows Quality information acquisition and dissemination across the organization Collaborative expertise across multiple disciplines and locations Optimum asset value through increased production and reserve recoveryAs the first step of project execution process, an IO study team was formed to carry out a conceptual study. The Samarang Integrated Operations (IO) study was conducted within the context of an Integrated Operations Model developed by Schlumberger. This model is used to frame, plan, and execute the IO Conceptual Study for Samarang.The methodology, scope of work, and project deliverables for the conceptual study, is based on the general description of the IO model. In general the IO model describes how asset decisions will be supported by new measurements and equipment proposed for installation on existing and new platforms. It also describes how decision process will be enabled by software applications and how collaborative decision making can be improved.An innovative parallel design approach was used to fast track the design process by integrating IO solution conceptual design in parallel to EPC FEED design for instrumentation with interface management as the main quality controller.Upon completion of the conceptual study, a total of 2010 man-hours were logged from interviews, workshops, peer reviews and offshore survey involved interaction with different stakeholders. The extensive time invested in the data gathering has enabled the team to complete the project deliverability inclusive of some additional scope.
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