TOPICS OF INTEREST
Adjustable, Supramolecular Viscosity Modifiers as Displacement Fluids in EOR
We report a novel type of viscosity modifier relying on the supramolecular assemblies that have pH-adjustable viscosities and robust tolerance against high temperatures and salinities, and are resistant to shear-induced degradation.
Renewable Energy Tech Is Now Priced To Reduce Upstream Spending
Renewable energy is often framed as being at odds with the oil and gas industry, but new price developments in the wind and solar sectors may be changing this paradigm, according to one US energy expert.
Cost optimization in heavy-oil production can be achieved through numerical modeling to suggest general optimal strategies and development plans or by using proper real-time data acquisition … for prompt decisions while operations are ongoing.
Fieldwide Determination of Directional Permeabilities Through Transient Well Testing
Knowledge of the maximum- and minimum-permeability directions in anisotropic reservoirs helps to optimize injector and producer locations and is important for reservoir management, especially under secondary or enhanced recovery of hydrocarbons.
EOR Performance and Modeling
Current conditions have made most companies decide to optimize performance of their existing assets, and EOR is a key part of that.
Proper Simulation of Chemical-EOR Pilots—A Real Case Study
A critical step in proper design and optimization of any chemical-enhanced-oil-recovery (CEOR) process is appropriate and precise numerical simulations.
Experimental and Numerical Studies of CO2 EOR in Unconventional Reservoirs
This study explores the mechanisms contributing to oil recovery with numerical modeling of experimental work and investigates the effects of various parameters on oil recovery.
A Field Trial in a Carbonate Reservoir Using a Solvent-Based Waterflood Process
Dimethyl-ether (DME) -enhanced waterflood (DEW) is a process in which DME is added to injection water and, upon injection, preferentially partitions into the remaining oil.
Tapping Difficult Oil in a Giant Carbonate Field in Qatar
After 70 years of production, more than 30% of the Arab C reservoir stock-tank original oil in place has been recovered through various mechanisms including natural depletion, waterflooding, gas lift implementation, and horizontal-well development.
ATCE: Fast Start for First Saudi CO2 EOR Project
Saudi Aramco saw a jump in production for a type of EOR that often takes years to see full benefits.
Use of Partitioning Tracers To Estimate Oil-Saturation Distribution
Partitioning interwell tracer tests (PITTs) have been used to estimate remaining oil saturations (ROSs) during waterflooding.
Scaling Up Smart Water
For nearly a decade, Saudi Aramco has been studying how altering the chemical makeup of seawater injected into its reservoirs can increase production. The result is "smart water" that can boost the sweep effectiveness of a waterflood.
Modeling of a Complex Reservoir Where the Normal Modeling Rules Do Not Apply
With the easy conventional oil in Argentina having been produced, one remaining way to find new oil in existing fields is to convert fields from primary or secondary production to secondary or tertiary production, respectively.
A New EOR Concept From Shell To Enhance Waterflooding
Part of what makes DME an intriguing EOR technology is that it is soluble in both water and oil—with a preference for the latter. Shell’s plan is to add DME to the waterflooding stream to reach a concentration of about 16%, the upper limit of its dissolvability.
There remain a number of challenges with CO2 EOR. These include gravity override, poor sweep efficiency, and economic factors.
Viscosity and Stability of Dry CO2 Foams for Improved Oil Recovery
Carbon dioxide (CO2)/water foams are of interest for mobility control in CO2 enhanced oil recovery (EOR) and as energized fracture fluids or as hybrid processes that combine aspects of both processes.
CO2-Based Enhanced Oil Recovery From Unconventional Reservoirs
In this study, detailed petrophysical and geological field models focusing on the middle and lower members of the Bakken Formation were developed.
EOR-For-Shale Ideas to Boost Output Gain Traction
The low recovery rates observed in most shale reservoirs has prompted a number of research projects to develop new enhanced oil recovery methods.
Miscible and Immiscible Gas-Injection Pilots in a Middle East Offshore Environment
This paper describes a gas-injection pilot that has been implemented in offshore Middle East carbonate reservoirs to assess injectivity, productivity, macroscopic-sweep efficiency, flow assurance, and operational efficiency in a field that has a long water-injection history.
Case Study: Steam-Injection Step-Rate Tests Run in the Orcutt Oil Field
The operator has initiated a cyclic-steam-stimulation project in the Opal A diatomite of the Sisquoc formation on the Careaga lease in the Orcutt oil field in Santa Barbara County, California. This paper discusses steam-injection step-rate tests (SRTs) for this asset as part of its expansion.
Polymer Injection in Deepwater Field Offshore Angola
The polymer-injection project in the Dalia field, one of the main fields of Block 17 in deepwater Angola, represents a world first for both surface and subsurface aspects.
Colloidal-Dispersion Gel in a Heterogeneous Reservoir in Argentina
The Loma Alta Sur (LAS) field is a multilayer fluvial sandstone reservoir in the Neuquén basin of Argentina. Colloidal-dispersion-gel injection was considered a viable strategy to improve oil recovery in the field after early water breakthrough.
Since 2006, production from gas injection has outstripped that from thermal, and is continuing to grow. Even though industry conditions remain tough, EOR is expected to be increasingly important in the future, with the possibility of further uptake of it linked to the climate-change agenda.
Mature Flood Surveillance Using Streamlines
With the recent drop in oil prices, operators are shifting to optimization of existing assets with minimal costs. For mature floods (water, chemical, and CO2), one low-cost optimization strategy is the intelligent adjustment of well-rate targets.
Chemical EOR for Heavy Oil: The Canadian Experience
Chemical enhanced-oil-recovery methods such as polymer and alkaline/surfactant/polymer (ASP) flooding are generally not considered suitable for oil viscosities greater than 100 or 200 cp.
Solvent-Enhanced Steamdrive: Experiences From the First Field Pilot
The addition of a hydrocarbon condensate to steam operations in heavy-oil and bitumen reservoirs has emerged as a potential technology to improve not only oil recovery but also energy efficiency.
Pilot Tests of New Enhanced-Oil-Recovery Technologies for Heavy-Oil Reservoirs
Thermal steam stimulation is considered the most effective of current methods for heavy-oil production. However, the method has problems with low coverage by steam injection and decreased efficiency.
Custom Biological Produced Water Treatment Yields Fast Oil Recovery Boost in Waterflood
This article describes how the use of a biological EOR technique that applied produced water for reservoir flooding in a mature field led to rapid and substantial increases in oil production.
EOR-Feasibility Study for a Large Carbonate Field in Kuwait
This study provides technical analysis of the viability of enhanced-oil-recovery (EOR) processes; the results indicate the potential for significant improvement in recovery efficiency over continued waterflooding.
Simulation of Residual Oil Saturation Through Tuning of Equilibrium Constants
Conventional miscible- or near-miscible-gasflood simulation often overestimates oil recovery, mostly because it does not capture a series of physical effects tending to limit interphase compositional exchanges.
EOR Performance and Modeling
Limited design capability, few number of field tests, and lack of monitoring and control were the reasons most EOR projects did not perform in the past. All those are history now.
Designing an Optimized Surfactant Flood in the Bakken
The Bakken’s ultratight, largely oil-wet nature limits the potential of waterflooding. As an alternative, an optimally spaced well-to-well surfactant-flooding technology is proposed.
Method for Adaptive Optimization of EOR Performance Under Uncertainty
The authors present a method to reduce uncertainty in EOR performance adaptively while identifying an optimal operational strategy for a given tolerance to risk.
Field-Development-Plan Optimization of a Giant Field for Recovery Improvement
To optimize the development plan of a giant carbonate reservoir offshore Abu Dhabi to extend the production plateau and improve recovery, detailed sector models were used to facilitate the large number of required simulation runs.
New Technologies Maximize Production in Viscous-Oil North Slope Field
Oil quality and drilling-pad constraints for a viscous-oil field defined a development scheme that consisted of a waterflood line drive with horizontal producers and water-injection (WINJ) wells side by side.
Understanding Waterflood Response in Tight Oil Formations: A Saskatchewan Case Study
An 18-well numerical-simulation model was built to represent an operator’s Lower Shaunavon waterflood-pilot area. Numerical simulation was used, and a history match on the pilot area was performed.
17 May 2017