Featured this monthRobotic Roustabouts for Tomorrow’s Subsea FieldsRobotic submarines, capable of operating by themselves thousands of feet under water for months and perhaps years at a time, are under development to become the vanguard of tomorrow’s subsea oil and gas fields.
A Long-Term View From Multiple Angles SPE’s technical directors think the industry needs multidisciplinary, data-driven ways to adapt to what is ahead, focus on what is critical for decision making, and take a long view as another generation takes over.
Talent & Technology – Taking a Balanced Approach to the Technical Skills Gap The industry continues to face a shortage of skilled workers with 10 to 20 years of experience, which affects staffing for midlevel management jobs and, subsequently, senior level management positions.
Guest Editorial With the shift of offshore developments to harsher environments and deeper water, the traditional method of estimating expected availability and production performance figures, using extrapolated data from previous experience, is increasingly insufficient.
Kuwait Unveils Upstream Opportunities The inaugural SPE Kuwait Oil and Gas Show and Conference in Kuwait attracted more than 3,000 delegates representing major oil and gas companies from all over the world.
EOR Performance and Modeling
Omer Gurpinar, SPE, Technical Director, SchlumbergerThis is the most exciting time for enhanced oil recovery (EOR) in recent memory. At last, almost everyone is talking about increasing recovery factors, and improved oil recovery (IOR) and EOR are being considered natural components of reservoir management.
UK Field Benefits From Reduced-Salinity Enhanced-Oil-Recovery Implementation BP has shown, by use of its reduced-salinity (RS) water-injection technology, that incremental increases in oil recovery can be achieved across length scales associated with coreflood experiments (inches), field-based single-well chemical-tracer tests (feet), and field trials (interwell distances). This paper discusses the process undertaken by the Clair Ridge project in getting RS enhanced oil recovery (EOR) [...]
Simulation of Flow-Control Devices With Feedback Control for Thermal Operations Factors such as hydraulic gradients in the horizontal completion, geologic and fluid variations in the reservoir, and well-placement issues can produce very poor steam conformance in steam-assisted gravity drainage (SAGD). Using proportional-integral-derivative (PID) feedback to control steam injection can lead to improvements in SAGD. Inflow- or injection-control devices (ICDs) can also improve SAGD performance. This [...]
Foam Simulation Faces Several Numerical Challenges Foam simulation brings various numerical challenges. Some of these problems are largely cosmetic, creating, for instance, fluctuating fluxes and pressure gradient but no significant effect on final recovery. Others severely influence the whole progress of the flood. This paper discusses the origin of the challenges, how to recognize them, how they can be mitigated, and whether [...]
Multiscale Simulation of WAG Flooding in Naturally Fractured Reservoirs Naturally fractured reservoirs (NFRs) contain a significant amount of remaining petroleum reserves and are now being considered for water-alternating-gas (WAG) flooding as secondary or tertiary recovery. The authors face the challenge of reservoir simulation of WAG by building models at various scales, starting with pore scale and expanding to an intermediate scale and then to [...]
Otto Luiz Alcantara Santos, SPE, Coordinator, PetrobrasStatistics on well-integrity incidents are difficult to find in the literature. There are some examples of kick and blowout events, but normally they are scarce and focus on the number of incidents and their root causes.
Zonal Isolation Through Gas Hydrates Offshore Tanzania Deepwater cementing becomes increasingly challenging as drilling operations move to greater water depths and more-remote locations. Before the first exploration well for an operator offshore Tanzania was spudded, an extensive cementing-operations risk analysis was performed. The risks determined were low temperatures at seabed, unconsolidated formations close to seabed, potential shallow gas, and likely presence of [...]
Uncertainty Evaluation of Wellbore-Stability-Model Predictions The purpose of this work is to investigate typical fracture and collapse models with respect to accuracies in the input data. Uncertainties in the input data will be considered to show how they contribute to the cumulative uncertainties in model predictions. In this approach, the input parameters are assigned appropriate probability distributions. The distributions are [...]
Perforating Through Casing Strings To Remediate Annulus Gas Leak ADMA-OPCO had integrity problems in one of its gas wells, and abandonment was the only option available to restore the integrity of the offshore multiwell jacket and revive adjacent wells. Integrity problems included oil/gas bubbles observed on the seabed around the conductor pipe and high sustained pressures in the outer cemented casing annuli. Because the [...]
Decommissioning and Abandonment
Win Thornton, SPE, Vice President of Decommissioning, BPIndustry perceives decommissioning projects as more risky and uncertain than capital projects. Several recent decommissioning projects delivered in an immature marketplace seem to support this view.
Modeling Options for Drill-Cuttings Management Advances in modeling techniques allow quantitative prediction of long-term trends in cuttings-pile characteristics and environmental risks, providing firm direction in mitigating risks. Modeling involving fluid dynamics, soil mechanics, scientifically verified 3D dispersion modeling, contaminant degradation, and seabed recovery was used in several scenarios: the extant pile, moving the pile across the seabed using suction pumps, [...]
Digital-Slickline Capability on Plug-and-Abandonment Conveyance Phases Slicklines often play a vital role in offshore plug-and-abandonment (P&A) operations, either in those phases of the operation that require slickline conveyance or because logistical, footprint, operational, economical, environmental, or regulatory parameters of a P&A necessitate full reliance on this small, light, cost-effective conveyance offering. P&A activities using digital slickline increase equipment, logistic, and marine-support [...]
Environmental Risk Arising From Well-Construction Failure The great majority of wells do not pollute. With that fact in mind, the purpose of this paper is to explain basic concepts of well construction and illustrate differences between single-barrier failure in multiple-barrier well design and outright well-integrity failure that could lead to pollution, using published investigations and reviews from data sets taken from [...]
Mature Fields and Well Revitalization
Jesse Lee, SPE, Chemistry Technology Manager, SchlumbergerSustainable growth in oil and gas production must stem from a combination of new discoveries and optimized recovery from maturing fields. Therefore, development of mature oil fields has been, and will increasingly be, an attractive subject.
Channel Fracturing Applied in Mature Wells in Western Siberia The new channel-fracturing technique is capable of increasing fracture conductivity by up to two orders of magnitude. The channel-fracturing technique allows development of an open network of flow channels within the proppant pack, enabling fracture conductivity by such channels rather than by flow through the pores between proppant grains in the proppant pack. The successful [...]
Optimum Development in Mature Fields: Sanga-Sanga Assets, Indonesia VICO Indonesia is the operator of the Sanga-Sanga production-sharing contract (PSC) in Indonesia. Against a backdrop of of 46% annual base decline, VICO generated and implemented an integrated and aggressive work program called the Renewal Plan. This is an integrated approach between reservoir management and technology application. This plan proved to be an efficient example [...]
Mature-Field Subsurface Integrity: Holistic Diagnostic Approach in Malaysia As a field matures, there is a crucial need to focus on integrity-related issues such as hazard prevention and mitigation. During the initial field development of D field offshore Terengganu in Malaysia, the well design was fit for purpose to meet production needs. However, extension of production requirements contrary to earlier plans, a production-driven operational philosophy, and [...]