In 2015, more papers were devoted to well construction in shale plays than in any prior year. Those shale topics also covered a diverse range of subjects within the sphere of optimizing construction efficiency and performance. Our industry’s demonstrated ability to innovate and continually improve well-construction technology will be all the more valuable to all plays if low oil prices persist, but especially so for shale and other high-cost-per-barrel plays. With rig counts decreasing, smart, effective workovers of existing wells will be even more important to maintaining production levels. Some examples of effective construction and workover techniques are provided within the papers provided here. I hope you find them of interest.
In paper SPE 170789, I was surprised to see the level of production improvements achieved with the use of wireline stackable straddle systems. This was accomplished in an openhole gravel-packed completion without external casing packers or consolidation of the gravel pack, a significant simplification.
Paper SPE 171015 is a good example of the widespread, innovative efforts to improve cost efficiency in shale wells. Case histories demonstrate the successful use of biodegradable, temporary diverting agents, rather than cement squeezes or mechanical tools, to simplify and reduce the cost of fracturing and refracturing operations. With fewer new wells being drilled, refracturing may offer a viable option to slow the decline of existing shale wells.
The industry has been working to relate cement mechanical properties to success/failure with annular isolation in the actual well for approximately 20 years; however, there are still no American Petroleum Institute standardized cement-testing and -evaluation protocols for cement mechanical properties, and there is much room for improvement. The investigative paper SPE 168650 relates how anelastic-strain and impact-resistance testing may enhance real-world predictive abilities.
Recommended Additional Reading
SPE 169514 Effect of Well Downspacing on Estimated Ultimate Recovery for Shale Oil Formations by Susrut Gautam Bharali, University of Houston, et al.
SPE/IADC 170480 Challenges of Casing Design in Geothermal Wells by Angelito Torres, Chevron
SPE 170712 Cement Evaluation—A Risky Business by Glen Benge, Baker Hughes
Bob Carpenter, SPE, Research Consultant, Chevron Energy Technology Company
01 May 2015
ExxonMobil, Tullow Lift Guyana Offshore Discovery Count to 16
ExxonMobil has now made 14 discoveries offshore Guyana, while Tullow's announcement of its second find in the basin comes just a month after reporting its first.
North Sea Still a Big Part of Total’s Future
Recent exploration success in the North Sea has motivated Total to invest some $10 billion in the basin over the next 5 years.
Integrating Fractional Flow Into Reservoir Surveillance Improves GOM Production
A case study in the deepwater Gulf of Mexico in which pressure transient analysis, fractional flow, and production logging tools were integrated to identify correctly the cause of, and execute an effective remedy for, a well’s productivity deterioration.
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