Extreme Force in Confined Spaces

Below the gap from the separated flange are some of the used ThinJacks and removed nuts.

Was your well flange seized fast? Had you cut the studs, then spent hours attempting to unscrew each one from the tree block, so you could connect the new flowline? Was pulling the flange with a crane impossible because of the 45 degree or horizontal direction of the force needed? Were both your Diving Support Vessel and specialist crane, for installing the “jumper spool”, “standing by”? Waiting to complete the tie-in from your subsea field to the brownfield platform?

The photograph shows the flowline flange on Well 19 installed in 1978. Now separated, loose and ready for lift off with the 2-tonne crane after ThinJack Ltd’s premobilsation exercise, solving this real-life problem.

So, what’s the story? “Nuts split and removed”, with systems which actually fit the space available. Then delivering 200 tonnes of controlled force, overcoming 200 cubic centimetres of binding magnetite and iron oxide in the bolt hole annuli. That’s “one tonne of controlled force per cubic centimetre of rust” needed to start moving this flowline flange, using a service which is an order of magnitude thinner and more powerful than any other.

Our premobilisation exercise separated this flowline well flange: re-familiarising established and new colleagues with tried and tested ThinJack services and sharing and shining a light on new ones. Adding to the days and months for our competency certified technicians to hone their craft. Doing the really boring stuff onshore, with old well parts, so we do not knowingly “train” on your well platform.

Of the first 30 years of this wellhead’s life, we heard of an apparent leak from the API connection: “solved” by welding several studs inside their bolt holes, presumably to contain the internal pressure. Separating the flange, welded to the studs, made the training exercise invaluable as it was harder than many operational jobs. (This flange is rated to contain an internal pressure of 5000 psi and so you’ll have your own conclusions on the welding “solution”).

We’d love to hear more about the “repair” technique on the flowline flange used pre-2008? Were you there? Was it to seal a leak or have we misunderstood something? And how would you have solved either the leak or the flange separation? Thank you. There’s a reward for the best reply.

We’re world class specialists in separating seized well flanges. Experienced on four continents and sharing 50 person years of niche technical experience with blue chip customers, like you.

You rate us highly on: “Service Quality”; “Product Quality”; “Project Management”; “Innovation and Improvement” and “Customer Interfaces”.

A quote from one of our clients “This is the most time efficient Christmas Tree separation I have ever seen.”

Would you like ThinJack Ltd to pre-plan and deliver your next job? To receive a time efficient service whilst on your critical path? To reduce downtime on supporting ships and specialist cranes? To lower the risk to people and wells by eliminating impulsive manual techniques, which are not powerful enough?

Of course, so please do call us. Thank you. Or will you actually talk about efficiencies, and then suffer from with what others endured before ThinJack were here: losing days, suffering unplanned specialist ship and crane costs, exposing people to hazards and disappointment. Familiar?

Image illustrating the gap post separation