Stephen Mair

Stephen has over a decade experience in WellBore CleanUp (WBCU) activities ranging from authoring industry best practices to WBCU research and development projects. With experience in various global locations (North Sea, Europe, Africa & Alaska) he has been involved in introducing the next generation of mechanical & software solutions to meet today’s WBCU challenges.
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Recent Posts

WBCU: Optimizing displacement while protecting completion equipment

OWS has developed a range of tools that allow multiple opening & closing of ports to allow on demand communication to the annulus and to allow rotation of the upper string when carrying out wellbore fluid displacements.

The Weight Set Circulating Tool and the Weight Set Swivel Tool have been successfully applied on two different projects, and in this article, I will share some of the experiences we had using the tools.

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Topics: Wellbore CleanUp

The benefits of wellbore clean-up and displacement experience

 

In previous blogs we have talked about how pre-job planning is key.  Although each well is different, there are fundamental similarities in each application. The question is how do we spot them? It all comes down to experienced personnel working on the project. Within the WellBore Clean-up product offering, there are a relatively low number of specialists worldwide that can offer the quality dedicated support required.

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Topics: Wellbore CleanUp

Planning your Displacement & WellBore CleanUp

Are you well (pun intended) prepared?

The key fundamental aspect of a wellbore clean up is a proper pre-job planning. During a careful run-through of the elements involved, you’ll be able to identify if there are any limitations on rig & surface equipment, as well as any potential downhole ‘showstoppers’. With proper planning & implementation, an efficient and optimal cleanup and displacement is achievable. Lets look at the areas of concern in more detail.

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Topics: Wellbore CleanUp

How a circulation tool can boost annular velocity

A key factor in any wellbore cleanup/displacement operation is good annular velocity (AV). Why is this so?

To remove the mud residue from the tubulars, the chemicals need to be working at the optimum ‘contact time’, flow regime and AV. Additionally if the AV is not within the optimum range debris may not be circulated out of the wellbore, which compromise safe deployment and operation of the completion. 

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Topics: Wellbore CleanUp

Debris extraction technology can validate well cleanness

How do you know that all the debris is removed from the well?

Bottom line, it is very difficult to ensure that all debris has been removed from the wellbore. During the displacement phase, two surface measurements can be used to check the cleanliness of the fluid.Whilst filtrating the completion fluid, the Solids Content and/or the Nephelometric Turbidity Units (NTUs) will be measured to check the cleanliness of the fluid and by extension the well. This does not always mean the wellbore is fully clear of all debris however.

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Topics: Wellbore CleanUp

A novel approach to casing preparation after drilling

With increased well costs, particularly in deepwater wells, the benefits of combining operations in one trip are too good to ignore. With new advances in technology it is now possible to combine what was two trips into one, saving considerable time and money. Your drilling bottom hole assembly (BHA) can now be designed to allow casing preparation operations to be performed immediately post drilling.

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Topics: Wellbore CleanUp, Casing Preparation

Inflow (Negative) Testing – Why & how?


When drilling the well and running tubulars, the drilling fluid will have a higher density than the reservoir/formation fluids to prevent any hydrocarbon influx. Prior to running in the production completion, the well is displaced to a lighter density completion fluid to encourage the hydrocarbons to flow into the wellbore and up the production tubing. If any integrity issues in the connections or the casing/liner overlap are present this could affect the overall efficiency of well production recovery, in addition to posing safety & integrity issues of the well construction. Hydrocarbons could potentially by-pass any safety related equipment in the well completion string.

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Topics: Wellbore CleanUp

The importance of cleaning your BOP

Our mums taught us the importance of brushing and flushing our teeth. It is a routine job that saves us a lot of agony and expenses. But are we just as mindful of how we treat our blowout preventers?

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Topics: Wellbore CleanUp

A blog from Odfjell Well Services

Odfjell Well Services (OWS) is an international well service company, providing world class TRS, rental and well intervention services worldwide.


Visit www.odfjellwellservices.com