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August 2020
5th Aug 2020 Addressing the production chemistry of enhanced recovery in oil and gas operations

Addressing the production chemistry of enhanced recovery in oil and gas operations

Dr. Andrew G. Shepherd

Shell Australia Regional Discipline Lead Production Chemistry


Andrew has worked for  Shell since 2006  in Europe ( Shell Global Solutions, Southern North Sea, Schoonebeek Oil, Sour Gas assets), Malaysia (Sabah deep water and EOR) and Australia (Prelude and QGC assets).

He has participated in many different phases of the production asset lifecycle, project support, research and development and technology deployment.

He is currently the Shell Australia Production Chemistry Regional Discipline Lead and Technical Authority 1 for Integrated Gas and Deepwater and the contract owner for all chemicals and laboratory services for Shell QGC.

Prior to joining Shell Andrew worked in the oilfield service sector and engineering vendors. Andrew has a Phd in Engineering and Physical Sciences from Heriot Watt University, Edinburgh.

He has been a member of SPE since 2002. He has volunteered in the SPE as conference co-chair (IPTC), workshop committees (Global R&D, production operations), technical chair reviews and  young professional. He is also a fellow of the Royal Society UK.


Many oil and gas producing fields are reaching late production life. As a consequence, assets are faced with a number of challenges that impact well, reservoir and facilities management. Most often than not, these strategies were not considered during greenfield design.

In the present work we will firstly provide a brief overview of the enhanced oil and gas options available for mature fields. Whilst some aspects of these technologies are not new, the deployment is very much dependant on favourable macro-economic scenarios. Production chemistry has contributed to advancing the state of the art namely with chemical flooding (polymer, surfactant, or combination), gas flooding (CO2, air, nitrogen), foam, steam injection and even advanced waterflooding have been the subject of intense research, projects and field trials and applications.

The impact of enhanced oil or gas recovery needs indeed to be examined from the production chemistry perspective from project to start-up to steady state operations. For instance, HSSE implications, since the new formulations need to adhere to local and sometimes international legislation. There are process implications, since, e.g. sourcing of feedstocks and logistics may be complex. There are compatibility issues to be addressed. Addition of chemicals and or gas injection may result in phase behavior problems such as separation/emulsions or precipitation of unwanted solids, such as asphaltenes or scale. Product compatibility with the existing metallurgy is also a necessary pre-check during front-end engineering.

The presentation will address some literature and project/operational cases where the interfaces of production chemistry in enhanced recovery operations played a significant role and provide a number of lessons learned for reflection and discussion.



Upcoming Events
September 2020
16th Sep 2020 Petroleum Well Regulation in Queensland


Michael Scott - DNRME


Michael has been Principal Inspector Wells at the Petroleum and Gas Inspectorate since November 2018.   Michael studied Mechanical Engineering at the University of Queensland and then went on to complete his PhD in Aerospace Engineering in 2005.  In the same year Michael joined QGC as a petroleum engineer having previously spent time working at Santos.   In his time at QGC he worked in a variety of different areas including production engineering, reservoir engineering and production enhancement, predominately focused on QGC’s Surat Basin CSG acreage.  In 2012 he joined Senex Energy working in production and completions roles, where his most recent position was as the Production Engineering Manager with his team being responsible for both Cooper Basin oil and gas assets as well as Surat Basin CSG.  Michael is a member of the Society of Petroleum Engineers (SPE), has co-authored several SPE papers and has a Certificate III in Dog Behaviour and Training.


The Petroleum and Gas Inspectorate (PGI) is responsible for administering Queensland’s safety and health regulatory framework for activities ranging from petroleum extraction through to household and commercial use.  The PGI conducts an annual program of work as part of its risk-based compliance program.  This is achieved through three proactive activities (engagement, inspections, audits) and three reactive activities (response to enquiries, complaints, incidents). This presentation will cover the regulation of petroleum wells in Queensland predominately focussing on the proactive activities conducted during the 2019/20 financial year.  While this program covered a broad range of topics there was an emphasis on well integrity management and well abandonment.  The results from this work will be discussed along with an outline of future planned work. 

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