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About Us

Greetings from the SPE, Wellbore Positioning Technical Section, ISCWSA


"The primary aim of this group is to produce and maintain standards for the industry relating to wellbore survey accuracy. To set standards for terminology and accuracy specifications. Establish a standard framework for modelling and validation of tool performance. Raise awareness & understanding of wellbore survey accuracy issues across the industry."

Click here to register for the new ISCWSA Training Course

Click here to download the NEW FREE ISCWSA: WELL INTERCEPT SUB-COMMITTEE ebook

Click here to play the recording of the SPE wellbore-ranging-technologies-intercept-applications-and-best-practices

Click here to download the free Making the Most of Borehole Surveying Video


The ISCWSA, (Industry Steering Committee on Wellbore Survey Accuracy) work has resulted in the publication of technical papers, leading technical work shops, multiple SPE “Hits and Misses” workshops, the Wellbore Positioning e-book, anti-collision papers and API project. We have comprehensive cross-industry, international representation with regular attendance from a wide variety of service companies, operators, and consultants, academia and software companies.

The Industry Steering Committee on Wellbore Survey Accuracy was founded to dispel the confusion and secrecy commonly associated with wellbore surveying and to enable the industry to produce consistent, reliable estimates of survey-tool performance in today's wells. We achieve these goals through the production and maintenance of standards covering the construction and validation of tool error models.

Work focused initially on Measurement While Drilling systems. They provide a large proportion of the total directional survey data world-wide and, because of their similarities between suppliers, are more amenable to specification standardization than other types of survey tool.

There is no formal membership enrollment to join the ISCWSA and its meetings are open to all who wish to attend. The committee generally holds twice yearly meetings and has held 48 meetings internationally to date. The ISCWSA is also affiliated with the Society of Petroleum Engineers as the SPE Wellbore Positioning Technical Section, click here to join.

Click this link for the Wellbore Positioning Technical Section Meeting Minutes

Click here for Wellbore Positioning Technical Section Sub-Commitee information and documents

Active Sub-Committees

  • Adrian Ledroz, Gyrodata:  Chair

  • Pending Election, : Program Chair


Wellbore Positioning Technical Section, (ISCWSA) Meeting 55


Greetings ISCWSA current and future members,

The next ISCWSA meeting, #55 will be held on the 30th & 31st March 2022. Click here to sign up for this FREE meeting.
Click here for the agenda list of presentations for the meeting sessions.

Amongst the ISCWSA Subcommittee Updates (#ErrorModel, #CollisionAvoidance, #SurveyQAQC, #OWSG #APIRP78, #Education, #WellIntercept and more information on our #NewISCWSATrainingCourse you will have the chance to interact with Multiple Industry Leading Peers. 

Kind Regards

The #ISCWSA Committee

See the message put out by SPE below:

SPE Events and COVID-19

Networking is such an important part of SPE, the COVID-19 virus has the potential to affect everything we do. Several conferences and workshops globally have been postponed; check the specific event websites. SPE will continue actively monitoring the situation and potential impacts on future activities. The health and safety of our members and attendees is our highest priority, and that will guide any decisions that we make. 

For those who want to learn more about the spread of the virus and protective measures, International SOS provides some excellent resources.



The ISCWSA Committee

Please visit our updated website www.iscwsa.net

Please pass this message on to others


  • Chair: – Adrian Ledroz
  • Program Chair: Hans Dreisig
  • Secretary: Tim Paton
  • Treasurer: Robert Wylie
  • Webmaster: Phil Harbidge
  • Membership Chair: Marc Willerth
  • Director at Large: Heather Vannoy
  • Director at Large: Mahmoud Elgizawy
  • Director at Large: Carol Mann
  • Director at Large: Matthew Weber

If you are a member of a sub-committee, we will be grateful if you can plan to attend. If you are interested in serving on a committee, contact the sub-committee chairperson. A contact list is available on the ISCWSA sub-committee tab.

  • Gary Skinner, Collision Avoidance Subcommittee Chair
  • Andy McGregor, MWD Subcommittee Chair
  • Mahmoud Elgizawy, Education Subcommittee Chair
  • Phil Harbidge, Survey QAQC Subcommittee Chair
  • Benny Poedjono, Well Intercept Subcommittee Chair
  • Jamie Dorey, Well Intercept Subcommittee Co Chair

Kind Regards,

If you or your organization can offer sponsorship for portions of the meetings (such as coffee breaks, lunches, meeting rooms etc.), please contact Adrian Ledroz, ISCWSA Chairperson. We are indebted to the many past sponsors who have contributed to sustain our technical community work which has been running for over 21 years and we look forward to continuing our good work for many years to come.



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