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22nd June – SPE WA Technical Evening Meeting – ‘Woodside Sangomar Field – Probabilistic Assessment of Depletion and Overpressure and its Impact on the Drilling Sequence’

June 22, 2021 @ 4:30 pm - 7:00 pm

$50.00 – $70.00


SPE WA is proud to present the details of our June technical evening meeting.

About the Presentation

The Sangomar Field Development, located offshore Senegal, will consist of 23 wells over stacked reservoirs, with horizontal lengths up to 1500 m. Oil production and water injection will commence during the drilling campaign. Therefore, the reservoir pressure in the wells executed post start-up may be inflated, depleted, or both, reducing the available mud window and impacting the drillability.

In this presentation, we will describe the process of identifying vulnerable wells by a combination of a deterministic borehole stability assessment of mud weight windows and a probabilistic well-by-well analysis of reservoir pressure at the time of drilling. We will introduce an innovative workflow which captures the range of subsurface uncertainties to define probabilistic risk of depletion and overpressure. The magnitude of pressure disturbance was in some scenarios significantly greater than initially anticipated.

Finally, we will show how the improved understanding of pressure depletion and inflation scenarios and mud windows was used to revise the well sequence in order to minimise borehole stability risks during the drilling campaign.

About the Speakers

Lisa Gavin

Lisa is a Geophysicist with Woodside Energy, based in Perth, Australia. She holds a BSc (hons) Geophysics from Curtin University, a PhD Geophysics from the University of Western Australia and is currently completing a MSc Petroleum Engineering by distance at Heriot Watt University. Lisa was the Society of Exploration Geophysicists Honorary Lecturer for the Pacific South Region in 2020. She is presently Executive Adviser to the SVP Corporate & Legal and previously completed a cross-posting as a Reservoir Engineer in the Sangomar Subsurface team.

Pieter Jagtenberg 

Pieter is a Reservoir Engineering Adviser with Woodside Energy, based in Perth, Australia. He holds a degree in Mining Engineering from Delft University of Technology and has 29 years of industry experience spanning operations, production technology and reservoir engineering in both technical and leadership positions across Europe and Asia Pacific.

Students (read below)!!!

SPE WA in conjunction with our sponsor tNavigator (Rock Flow Dynamics), are kindly sponsoring students to attend the monthly technical events. Please fill out an application form, explaining why you are interested in attending the SPE WA technical events. Successful applicants will be notified via email. Note that applications will only be accepted up to one week prior to the event.

Free tickets available for Students. Please apply through your Student Chapter.

Event Run Sheet (Catering – Drinks and Food will be provided)

  •         16-30 to 17-00 Registration & Networking
  •         17-00 to 17-15 SPE Region Director Opening by Neil Kavanagh
  •         17-15 to 17-45 Technical Presentation
  •         17-45 to 18-00 Q&A
  •         18-00 to 19-00 Networking drinks & nibbles

Ticket Price:

Ticket Price Early Bird (By 15th June) Regular
SPE Member $40 $50
Non-Members $60 $70



June 22, 2021
4:30 pm - 7:00 pm
$50.00 – $70.00


Parmelia Hilton
14 Mill Street
Perth, Western Australia 6000 Australia
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