In each issue, Oilfield Review provides authoritative, relevant, and informative articles on technical topics. In addition, the Defining Series delivers a succinct briefing on key E&P technologies and processes.
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Log analysis of heavy oil reservoirs may be hampered by difficulties in distinguishing heavy oil from freshwater. A wellsite quicklook evaluation process that incorporates a multifrequency dielectric measurement is helping operators overcome this challenge.
Cement sheath evaluation is enhanced when engineers consider cement evaluation logs in the context of events that took place during drilling and subsequent cement slurry placement. Such an integrated approach helps engineers confirm the presence of zonal isolation or determine why isolation has not been achieved. In the latter case, a complete well history analysis offers operators valuable guidance for improving future cementing operations.
Drilling mud removal is a key step for attaining successful cementing operations. Although mud removal technology has featured the use of spacers for many years, spacer design and composition have not kept up with the increasing complexity of drilling fluid chemistry. Recent industry efforts are now providing enhanced and optimized spacer solutions that clean the wellbore more efficiently, helping ensure zonal isolation and well integrity from cementing operations.
Unconventional resource plays revolutionized oil and gas production in North America. Because these types of plays provide many challenges to operators, they have been slow to develop in other parts of the world. However, the Vaca Muerta formation in the Neuquén basin of Argentina can now be added to the list of successful producers. The triumph in the Vaca Muerta play resulted from engineers at YPF, SA and Schlumberger collaborating on an integrated approach that includes field- and formation-specific workflows and the application of a dynamic unconventional fracture model to optimize hydraulic stimulation programs.
Like all artificial lift systems, rod pumping is used to restore production when the natural drive energy of a reservoir is not strong enough to push hydrocarbons to the surface. Today, operators are applying this mature technology to enhance production from unconventional resources that were considered, until recently, economically or technically inaccessible.
Defining Geomechanics, Defining Mud Logging, and Defining Gas Lift
The Defining Series—concise, authoritative 2-page summaries of E&P fundamentals.