Because of extremely high internal and external pressures, unconventional separator designs must be used in ultradeepwater applications. A major operator has qualified a number of subsea technologies covering a wide range of operating conditions and fluid properties that encompass its subsea portfolio. This approach reduces the cost of qualification and streamlines shedules for future subsea projects.
Decommissioning costs are often made higher by decisions made during the initial engineering and construction stages of an offshore oil or gas field. Designing with a critical eye can go a long way toward reducing the decommissioning costs, which occur decades later.
The application of lessons learned in projects is generally a trusted approach to tackling design challenges. However, the design of onshore production systems for unconventional resources does not allow for straightforward crossover from onshore or offshore conventional to unconventional systems.
Peer Review Editor
An analysis is performed of projects using integrated template structures to establish current practices. The operation and installation of subsea modules is used to develop a set of parameters that can be used to optimize a template structure. Using the parameters, the authors derived the optimal integrated template structure for the Arctic region.
The authors describe how mechanical vapor recompression technology (MVR), which is used by the food, chemical, and pharmaceutical industries, can also be applied to recover demineralized water from concentrated brines. An operator’s experience with the application of MVR in shale-gas operations is discussed.
A statistical analysis is done of the weather windows of opportunity—the time span during which the conditions required for weather-sensitive marine operations (such as heavy lift, topside float over, and pipeline tie in) are met. The approach is applied to a hypothetical float over in southeast Asia to show that the use of statistical distributions can significantly enhance the reliability of the weather-window analysis.
The flow regime in pipeline-riser systems is characterized by large pressure fluctuations at the base of the riser and fluctuations in fluid delivery from the top of the riser, which can adversely affect production and equipment. The observed data from air-/water-flow experiments are compared with the results from a flow simulator. Although the stability maps, pressure amplitudes, and slug frequencies are in acceptable agreement with each other, some deviations were seen regarding the slug frequencies at low flow rates.