Engineers used real-time adnVISION Azimuthal Density Neutron images to improve steering and penetrate three times more pro- ducible reservoir than any previous well in this
fi eld. Using continuous inclination measurements 4 m [13 ft] behind the bit, the directional driller was better able to respond to the changes in the well plan requested by the wellsite geologist.
Drilling with a Twist
E&P companies plan increasingly exotic well- bore trajectories and configurations that push the limits of existing directional-drilling technol- ogy, while simultaneously seeking cost savings and improved quality in these operations. The success of the first-generation rotary steerable systems increased demand substantially; for Schlumberger, this has led to the use of rotary steerable systems
in 26% of the footage EUROPE Njord field
Schlumberger tools drilled during 2003. Most of this drilling occurs in offshore environments, but the technology is also applicable in onshore operations. Industry observers believe that its widespread, rapid acceptance and application now make rotary steerable drilling a main- stream technology.12
Slimhole rotary steerable systems, such as the PowerDrive Xtra 475 tool, have demonstrated operational and economic merit, particularly in mature fields, where the production-rate limitations of slim holes are not an issue.13
Like NORWAY Oslo Stavanger
> Njord eld location, offshore Norway. 0
0 200 200 400 600 km 400 miles
their full-sized counterparts, these slimhole tools provide the mechanical advantages of continuous rotation, but also offer the economic rewards of using less drilling fl uid, cement and other mate- rials. Slimhole drilling also minimizes cuttings and cuttings-disposal costs because of the smaller hole volume. Slimhole rotary steerable drilling is expected to play a vital role as more fields reach maturity because this technology improves effi ciency and lowers cost. In the future, rotary steerable technology must address operator expectations for even faster rates of penetration. Powered rotary steerable tools will make this possible. Other enhancements will provide even greater reliability and efficiency. Ultimately, “ shoe to shoe” rotary steerable drilling will allow compa- nies to drill out the casing shoe and continue drilling to the next casing point in a single run. With industry costs for nonproductive drilling time estimated at US$ 5 billion per year, rotary steerable systems will be a key to preventing or reducing these signifi cant losses.— GMG
Spring 2004
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