Q&A No.726 - H2S Monitoring

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Phil Stemler of Suncor in Canada has a question for the network regarding H2S monitoring.  If any of you have experience or advice that you can offer Phil, I’m sure he’d be most appreciative.

“We are preparing to work on wireline based interventions here in terra nova where we have H2S present as a result of reservoir souring.  There is H2S present in the wellbore; so we are curious about the monitoring methods others experience with during other offshore operations.

We would appreciate any experience people may have with real-time monitoring H2S personal TWA exposure to the ACGIH TWA of 1ppm / 8hr day, specifically on a sour-gas drilling, completion or intervention job please!?”



asked Jan 21, 2019 in COIN by Fiona Curley (1,480 points)

2 Answers

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Response from Hayden Smith of Enquest in Aberdeen:

Hi Phil,

We have used the following company (Although others are available) in the past for both platform based Well Intervention operations and on the LWI Well Enhancer Subsea operations.


The likes of Sabre Safety would handle the following, Breathing Air Cascade systems, Gas detection .i.e. personal detection, fixed gas detection, area detection and wireless detection, they would also Engineer H2S bespoke solutions for you upon request, and provide offshore Supervision for face fitting, setting up all the monitoring equipment etc.

Kind regards



answered Jan 22, 2019 by Fiona Curley (1,480 points)
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Win Cubed sent Phil a presentation given by George Sweeney of Axis during a Welltesting Network MTM - No.19 (Aberdeen, September 2016), entitled 'General Review of H2S Procedures and Best Practices'.  

This document is available for download to WTN Members from the 'meetings' section of the WTN website.


answered Jan 28, 2019 by Fiona Curley (1,480 points)