Fall 2014 /

Process Modelling and Optimization. 

The Process Ecology Newsletter includes updates and news relevant to the energy industry regarding regulatory updates for air emissions, technical information related to process simulation as well as case studies and best practices in process engineering.
This issue
  • Estimation methods for solution gas venting/flaring
  • Modeling benzene emissions reductions in condensation tanks
  • FlareAdvisor: track your flared and vented volumes more accurately


Comparison of estimation methods for solution gas venting/flaring

The accurate calculation of greenhouse gas emissions is increasingly important in Alberta and throughout the world as government regulations force Oil & Gas companies to reduce emissions or pay a penalty for every tonne of GHGs emitted over a specified target.

At oil production facilities, the bulk of the gas produced along with the hydrocarbon liquids is separated from the liquid phase at the inlet separator. A certain amount of gas remains trapped in solution at high pressures and it is referred to as solution gas. The amount of this gas depends on the temperature and pressure of the separation vessel, as well as the oil composition. The solution gas is subsequently released through a flashing process when the hydrocarbon liquids are further processed or stored at lower pressures and thermodynamic equilibrium between the vapour and liquid phases is established. This gas is also a source of VOC emissions and it may be vented, flared or conserved depending on the quantity of gas, regulatory requirements and the economics.

The main objective of this article is to compare solution gas losses from storage tanks calculated using empirical correlations and rigorous flash calculations. (...)  Full text



Modeling benzene emissions reductions in condensation tanks


According to the Canadian Association of Petroleum Producers (CAPP), there are about 4,000 operating glycol dehydration units in Western Canada, and benzene emissions from these units are a major concern. The Alberta Energy Regulator (AER) regulates the maximum allowable benzene emissions from these units through Directive 39. In January 2013, AER introduced new regulations to reduce benzene emissions from most dehydration units to less than 1.0 tonnes/year by 2018.
 
AER currently accepts process simulation predictions (HYSYS, GlyCalc, ProMax) for the entire facility, except for condensers when used as emissions control technology. Total Capture Testing is currently the only option acceptable to the AER for claiming benzene emissions reductions due to a condenser.

The Alberta Upstream Petroleum Research Fund launched a project with Process Ecology Inc. with the objective to develop a software tool which could be used to accurately estimate benzene emissions reductions in condensers.

The software tool has been developed as a web-based application incorporating detailed first-principles models including heat transfer calculations for various geometries, vapor-liquid equilibrium relations and the impact of local ambient conditions. Read more. (...) Full text
 Next Training and Events
  • Process Ecology to deliver Heat Recovery Workshop with NRCan, Calgary, AB Winter, 2015.
  • The Process Ecology OLI-HYSYS interface for SAGD plant-wide modelling was presented at the OLI Simulation Conference in New Jersey, October 2014
  • Process Ecology submitted a paper for innovative uses of process simulation for pipeline infrastructure planning at the GPA Convention, April 2015. San Antonio TX



Track your flared and vented gas volumes using Process Ecology's new FlareAdvisor software.

FlareAdvisor is an innovative web-based software that is designed to assist the Upstream Oil & Gas sector estimate and manage flaring and venting volumes and associated air emissions from operating facilities. With particular focus on non-routine events, FlareAdvisor brings together the benefits of a modern internet-based platform with rigorous engineering calculations that will meet the most stringent requirements for reporting.

To learn more about the product and to register for a trial please visit www.methaneadvisor.com


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