While attempting to hold backpressure, the bottomhole pressure began to
gradually reduce, and flow returns were observed, causing both floats on the
drillstring to fail. At only 100 ft from TD, the float failures prevented the
necessary backpressure to be applied to the well.
To overcome the float failures, the well engineering team used VIRTUAL
HYDRAULICS software to determine a weighted pill that would offset the applied
700-psi backpressure and help reach TD. The pill remained in the string to
offset the backpressure required to offset swab.
During the tripout, the applied backpressure mitigated the swab, and no
influxes were recorded. The bit was pulled out to the shoe before running back
to TD to ensure a gauged open hole prior to running casing. When tripping out
the second time, the team spotted a 90-bbl, 13-ppg pill at 10,600-ft [3,231-m]
MD. The method from the first trip was applied by slugging the pipe with 10 bbl
of 14-ppg mud while holding an applied backpressure of 600 psi.
Achieved drilling objective, set record for Halcón
Using integrated M-I SWACO services, Halcón successfully drilled
the 20,645-ft well to TD, and met its drilling objectives. For both trips out,
the drillpipe was pulled dry, the hole was clean of oil and gas, and the
drilling fluid was in excellent condition. This operation set a record for
Halcón Resources for the fastest lateral well drilled in the Bakken