BAKU, Azerbaijan, February 5. SLB (formerly
Schlumberger) company has successfully applied advanced drilling
technologies in Azerbaijan, SLB product engineer Gauharbek Ungaliev
said at the IADC Drilling Caspian 2026 conference and exhibition in
Baku, Trend
reports.
"At our offshore site in Azerbaijan, we successfully implemented
advanced drilling technologies. As part of the project, we drilled
a pilot well with a diameter of 8.5 to 8.25 inches using a
conventional PDC bit and expanded it to 10 ¼ inches using a reaming
tool (underreamer)," Ungaliev explained.
According to him, the company drills and simultaneously expands
the well using a rotary steerable system, which is necessary to
meet directional requirements.
"The typical interval length for this application ranges from
300 meters to nearly 2,000 meters from well to well, using an
oil-based drilling fluid, with a deviation angle of two to three
degrees of double axial gravity," he noted.
The engineer emphasized that this application focuses on
expanding the well as smoothly and deeply as possible to install
the casing or liner as close as possible to the target depth of the
interval.
"Traditionally, this operation requires two separate runs and
multiple passes because after the first pass, there remains a long
rat hole—an area at the bottom of the unexpanded well.
We leave this section after the first pass because in the first
BHA, between the bit and the upper reamer, there are many
components such as MWD, LWD, stabilizers, and the rotary steerable
system itself. All these components between the under-reamer and
the bit occupy about 35-40 meters, which remain unexpanded to 10 ¼
inches," he added.
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