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Wärtsilä’s integrated infrastructure combines the bridge systems, cloud data management, data services, decision support tools, and access to real-time information for the fleet of tankers managed by Sovcomflot, Russia’s largest shipping company. Wärtsilä plans to develop a harbor tug design to maximize ecological operational sustainability to be used a new port facility being built in the Brazilian city of São Mateus, which will have environmental demands among the most stringent in the world.
With declining trends in production and dwindling reserves for a 35-year-old offshore field, the Samarang Redevelopment Project was initiated with a vision toward implementing integrated operations as an asset-management decision-support tool. This paper describes a case study in which four reservoir models were coupled with a production-network model, with the objectives of maximizing recovery factors, identifying operational problems, and evaluating water-production effects.
Moving their directional drillers into their Houston real-time remote operations centers has improved drilling efficiency for two of the top shale producers. This paper presents an interdisciplinary approach to the description of tectonic dislocations made on the basis of interpretation of seismic data, petrophysical analysis of well-logging data in horizontal wells, and inversion of a multifrequency propagation tool. This work presents a systematic geosteering work flow that automatically integrates a priori information and real-time measurements to update geomodels with uncertainties and uses the latest model predictions in a decision-support system (DSS). The use of intelligent software is on the rise in the industry and it is changing how engineers approach problems. A series of articles explores the potential benefits and limitations of this emerging area of data science.
Influence is an important part of engineering. It is not enough to develop a brilliant design; you have to convince someone to build it. Intuition and reason are important factors in influence. This regular column addresses the social side of engineering. We are pleased to include an article written by two of the more prominent names in decision-theory research.
Learn to frame and evaluate a wide variety of day-to-day energy industry value-of-information (VOI) problems, specifically in unconventional resources. Attendees will be introduced to a step-wise approach to value information in resource plays and will work a few commonly encountered unconventional resource play information decision problems. Decisions around pre-frac data and valuing seismic at the program level for detecting sweet spots and high grading drilling locations and drilling order will be worked in multi-discipline breakouts. These will be interspersed with lectures and discussions. An overview of spacing pilot design framing and evaluation will also be covered. Using VOI workflow software (DTrio) to guide the evaluation and the reference cases provided, attendees will learn how VOI decisions are set up and evaluated, sensitivities are performed on key input variables, and insight is gained to determine if and when new information can add value. Develop an understanding of the VOI workflow and its practical application Understand how VOI is an important aspect of asset management and decision analysis Learn how to frame and value information which may change "go/no go" asset decisions, and be introduced to how VOI affects "how to go" or optimization asset decisions Learn how to evaluate acquiring information in unconventional resource plays
Graham, Alexander (Heriot-Watt University) | Salleh, Intan (Petronas) | Ibrahim, Jamal (Petronas) | Khairuddin, Khairunnisa (Petronas) | Singleton, Michael (Heriot-Watt University) | Sorbie, Kenneth (Heriot-Watt University)
The injection of sea water for the pressure support of oil fields is commonly associated with the biogeneration of hydrogen sulfide (H2S) by sulfate reducing bacteria and/or archaea (SRB/SRA). H2S is extremely toxic and corrosive, as well as providing a source of sulfide ions for the formation of iron, zinc and/or lead sulfide scale. However, H2S production is rarely, if ever, associated with seawater breakthrough and its retardation can be linked to a number of mechanisms.
Certain minerals (
Candidate mechanisms for sulfide scavenging by iron-bearing minerals have been experimentally identified and scavenging capacities have been determined for siderite FeCO3 in modified static adsorption tests and in dynamic pack floods, for aqueous-only systems. The effects of changing several conditions were studied, including temperature, initial pH and grain size.
A combination of dissolution/precipitation and surface displacement mechanisms were identified in the static bottle tests and further confirmed during the dynamic sand/siderite and crushed-core pack floods. ESEM-EDX and particle size analyses established the presence of mobile FeS (<100 µm) in the column after the flood had reached completion, confirming the bulk precipitation of FeS from dissolved Fe2+. Bringing together these two mechanisms allowed for the rationalisation of the observed scavenging profile, with reference to the Ksp of siderite. By further understanding the mechanisms of H2S scavenging experimentally, it will be possible to incorporate these into field-prediction models.
The absolute values obtained for the 8 wt% siderite packs were 1.03 and 1.74 mg/g at 25 and 96°C, respectively. Crushed core packs yielded significantly higher values of 5.76 and 5.80 mg/g at 25 and 96°C, respectively, which have been hypothetically attributed to the presence of iron-bearing clays in the core samples.
This study intends to propose parameter adjustment for economic evaluation in considering abandonment expenditures (ABEX) during front end loading (FEL) of discovered petroleum resources. In maturing a petroleum field development, abandonment and decommissioning of wells and facilities requires consideration during FEL. FEL, long adopted by prominent E&P players worldwide is used to support capital investment decision-making where value i.e. expected monetary wealth is measured and evaluated by Discounted Cash Flow (DCF) analysis. However, the DCF approach is outdated and flawed where it does not capture fluctuation well. This study reviews ABEX of sub-commercial contingent resources or shelved projects and economic evaluation method used in the author's organization and their parameters, identifying relevant and applicable adjustments that could be made associated to ABEX. Combining the revised ABEX with a modified economic model, a proposed set of categorical adjustments to is produced. The results show that the ABEX of the previously sub-commercial projects yield a more competitive number with revised semi-detailed estimates and different escalation and inflation approaches. Additionally, a standardized assumption for abandonment year before cessation of production is recommended to provide a more realistic evaluation of when ABEX is actually required to incur. These, in turn, improves the Net Present Value (NPV) of the projects tested as well as their viability and rank towards being sanctioned for development.