American Oil and Gas Reporter - April 2015 - 149
SpecialReport: Bits & BHAs
ficiency, Morrissey says Tercel has worked
with a cutter manufacturer to develop a
proprietary sintering process that conditions the cutters. "Since the development
of deep-leech cutters, the industry has had
access to cutters that offer both abrasion
and shock resistance," he notes. "We see
the Phoenix cutters as the next step change
in cutter technology, since they exhibit
higher and more equal shock and abrasion
resistance."
The bit has delivered up to 82 percent
increases in ROP compared with offsets,
but Morrissey estimates the average increase to be 20-25 percent.
"We are setting ROP and distance
benchmarks across the globe," he re-
ports. "For example, we have delivered
778 feet/hour in South Texas and drilled
10,159 feet in a single run in Wyoming,
and we are returning in a consistently better dull condition than bits with traditional cutting structures."
In the Permian Basin, MicroCORE
helped a customer who needed to drill from
1,900 feet to 6,500 feet through the Brushy
Canyon formation with one bit. "The run
involved highly-interbedded lithology with
hard stringers, so the operator previously
had to run two bits per interval, and 60 percent of those came back damaged beyond
repair," Morrissey relates.
"The operator was using a six-blade, traditional bit and an integral blade stabiliz-
er, so he was seeing axial vibration and
stick slip that were breaking the bit's
shoulders and shearing the cutters," he explains. "After doing an analysis, we replaced the integral blade stabilizer with our
TorqAVENGER, a three-point roller reamer. Because it contacts the bore through
dome-shaped cutter cartridges that roll on
a bearing, the tool conditions the wellbore
without generating as much torque.
"We also designed a seven-blade MicroCORE bit," Morrissey continues. "In
conjunction with the TorqAVENGER, it
was able to drill the entire section at a high
ROP and come back in repairable condition. By eliminating the bit trip, we saved
the operator 34 hours and $100,000." Ì
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APRIL 2015 149
American Oil and Gas Reporter - April 2015
Table of Contents for the Digital Edition of American Oil and Gas Reporter - April 2015
Contents
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