Don McClatchie

The big challenge with drilling in the Jean Marie is not to damage the formation with water, says Don McClatchie, business development manager for coiled tubing drilling at BJ Services Company.

McClatchie is the co-author of a study that found operational ease, safety and reduced damage to the reservoir are some of the reasons for using coiled tubing, horizontal, underbalanced drilling in under-pressured, compartmentalized carbonate reservoirs such as the Jean Marie formation.
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The advantage of coiled tubing is you never have to stop and start pumping to make a connection like you do with conventional drilling, says McClatchie.

"You have better control of bottomhole pressure and you can ensure you never go overbalanced.That way you protect the reservoir rock from water the whole time.By ensuring you stay underbalanced you never have water leaking off into the rock.There's always gas flowing out of the reservoir while you're drilling," says McClatchie.

That's the number one driver of using coiled tubing, he says.The other, secondary benefit is that coiled tubing is about 15% to 20% faster to drill with because there is no need to stop to make connections."Obviously that's going to vary as to how good the drill rig crew is but in general there are some savings," he says.

The other, less tangible benefits are on the safety side, he says."You don't have people handling joints of pipe and so forth, working on the rig floor.It's inherently safer for equipment operators," says McClatchie.

There is a difference of plus or minus 10% in the cost of using coiled tubing versus jointed pipe, so there's not much difference in their economics, he says.

"Coiled tubing is safer and generally it's a little bit faster.It's safer for the personnel and you get a slightly less-damaged well," says McClatchie.
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Don McClatchie, BJ Services,

Tel: (403) 512-4472,

E-mail: dmcclatchie@bjservices.ca

Don McClatchie

Bakersfield, CA

+1 661-831-5084

+1 661-836-8903

Trevor Dufresne, Penn West Energy Trust, Canada; and Don McClatchie and Tim Leshchyshyn, BJ Services Company, Canada
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Don McClatchie is the global business development manager for Coiled Tubing Drilling at BJ Services Company.He has 11 years in the coiled tubing industry, in a variety of operations, research and management roles.He has authored a number of technical papers on coiled tubing applications.Mr. McClatchie has a mechanical engineering degree from the University of Alberta.E-mail: dmcclatchie@bjservices.ca.

Don McClatchie is the global business development manager for Coiled Tubing Drilling at BJ Services Company.Tomothy Leshchyshyn is the senior technical specialist for Special Projects in the Stimulation Department at BJ Services Company Canada.

Don McClatchie

The addition of composites to the range of materials available for coiled tubing manufacture has raised a number of issues.An understanding of the advantages and limitations of this new material will serve to more clearly identify the niche for composite coiled tubing in oilfield service.Current assumptions as to what diameter of coiled tubing is suitable for a given application are no longer valid.The change in stiffness for any given coiled tubing diameter associated with a custom designable composite matrix requires careful modeling of all forces acting on the tubing during well interventions.Hardware issues must also be addressed if a new tube material is to be integrated into the existing worldwide coiled tubing fleet.

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Don McClatchie, BJ Services Company, Region Engineer - Pacific Coiled Tubing Services, Bakersfield, California

Education : B. Sc.Mechanical Engineering from the University of Alberta, 1994.

Career : Coiled Tubing Engineer - Canadian Operations - 3 years ; Coiled Tubing Research & Engineering - International Technical Support - 2 years ; District Engineer - Gulf Of Mexico Coiled Tubing Operations - 1 year ; Region Engineer - Pacific Region - current SPE Member ; Association of Professional Engineers, Geologists, & Geophysicists of Alberta International Coiled Tubing Technical Association Member.

The lunch meeting is to be held Tuesday, March 14, 2000 at 11 : 30 am at the Lafayette Petroleum Club.Meeting/Meal cost is $ 12.00 with reservations and $ 15.00 without reservations.Please RSVP by Monday, March 13th Noon, so we can ensure adequate meals and seating.Contact Susan Fowler (Dowell Schlumberger) at 265-2417 or or email to mailto : rsvp@spe-laf.org for attendance.