| Authors |
Andy Hatch, Eon Ruhrgas, Nicol Shepherd, Eon Ruhrgas, and Peter Diepeveen,
Eon Ruhrgas, Grant Affleck, Weatherford International
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Abstract
This paper will address the improvements in well placement and drilling
efficiency seen during a start-up project where wired drillpipe was introduced
as an enabling technology during the project.
By using multiple strands of new technology, in a controlled, managed fashion,
Eon Ruhrgas delivered rate of penetration (ROP) increases of 200% and, at the
same time, increased net-to-gross by nearly 100%. The delivery of these new
technologies will be reviewed along with the culture of learning and constant
improvement fostered by the Eon Ruhrgas. The collaborative atmosphere led to an
open environment where all the potential issues, risks, and hazards had been
discussed and contingencies made to ensure that delivery would not be
compromised.
A case study on the drilling of the first three wells on the Babbage field,
where significant new technology advances were introduced on the second and
third development wells, will outline, in detail, the improvements in
performance observed. In summary, the introduction of wired telemetry drillpipe
and the use of a downhole-powered rotary steerable system (RSS) ensured optimum
trajectory control, ensuring “sweet” spots were identified and delivered, while
maintaining an optimum ROP. By using the increased data-carrying capability of
the wired drillpipe, it was possible to provide high quality image data,
allowing a better understanding of the downhole environment and ensuring that
the stratigraphic control was optimized. The optimization was enhanced by
24-hour operations geological support, continuous dip-picking, and geosteering
modelling support onshore but livelinked to the wellsite. By using this
knowledge in conjunction with a mud motor power section attached to an RSS, it
was possible to deliver a step change in drilling performance through the
reservoir.
Introduction
At the Amsterdam SPE drilling conference of 2009, members of the Eon Ruhrgas
drilling team attended a presentation on the use of wired drillpipe. This
spurred the team to look at innovative technologies that could be used on the
upcoming Babbage field phase 1 development that was, at that point, in the
advanced stages of planning. To follow up on this, Eon Ruhrgas formed a team,
incorporating their drilling group, their subsurface group, NOV (suppliers of
the wired drillpipe) and Weatherford (suppliers of directional drilling and
M/LWD services) to see what the introduction of wired drillpipe could add to
the project.
After poor results drilling the reservoir section of first of the three planned
wells, the opportunity was taken to try a new technology that would hopefully
lead to better performace. This technology adoption would allow the initial
well to serve as a “benchmark” for performance. The decision was made to
introduce the wired pipe technology on the subsequent wells in the phase 1
development.
The introduction of this new technology had several nested drivers, each
leaning on the other. The first driver was to improve real time understanding
of the reservoir. The second driver was to optimize well placement, by use of
this better understanding. The third driver was to use this to allow use of a
mud motor power section to maximize drilling ROP.
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