Summary We have applied UTCHEM-IPhreeqc to investigate low-salinity (LS) waterflooding and LS surfactant (LSS) flooding. Numerical-simulation results were compared with laboratory experiments reported by Alagic Skauge (2010). combines the UTCHEM numerical chemical-flooding simulator IPhreeqc, United States Geological Survey geochemical model. The IPhreeqc model was coupled as a function of reactions. coreflood performed in vertical cores without using polymer or other mobility-control...

Abstract The observed uneconomic production performance in many shale gas horizontal wells suggests refracturing as a restimulation treatment to revive economic production. To achieve high-performance re-stimulation, it is critical select the right well among other area and determine proper time of refracturing. Well selection challenging because complexity natural induced fracture networks cases due insufficient reservoir completion data. Selection candidate can be made based on thorough...

Gas-production decline in hydraulically fractured wells shale formations necessitates refracturing. However, the vast number of a field makes selection right well challenging. Additionally, success refracturing job depends on time to refracture shale-gas during its production life. In this paper we present numerical simulation approach development methodology for screening and determine optimal We implemented our Barnett Shale, where had access data. The reservoir characteristics initial...

Summary Classical stability theory predicts the critical velocity for a miscible fluid to be stabilized by gravity forces. This was tested surfactant floods with ultralow interfacial tension (IFT) and found optimistic compared both laboratory displacement experiments fine-grid simulations. The inaccurate prediction of instabilities on basis available analytical models is because complex physics floods. First, we simulated vertical sandpack validate numerical model. Then, performed systematic...

Abstract We have applied UTCHEM-IPhreeqc to investigate low salinity waterflooding and surfactant flooding. Numerical simulation results been compared with laboratory experiments reported by Alagic Skauge (2010). combines the UTCHEM numerical chemical flooding simulator IPhreeqc, United States Geological Survey geochemical model. The IPhreeqc model was coupled as a function of reactions. coreflood were done in vertical cores without using polymer or other mobility control agents. These at...

Summary The potential leakage of hydrocarbon fluids or carbon dioxide (CO2) out subsurface formations through wells with fractured cement debonded microannuli is a primary concern in oil-and-gas production and CO2 storage. presence fractures annulus apertures on the order 10–300 µm can pose significant danger effective permeability range 0.1–1.0 md. Leakage pathways small are often difficult for conventional oilfield to repair; thus, low-viscosity sealant that be placed into these easily...

Summary Recent surfactant-flooding experiments have shown that very-efficient oil recovery can be obtained without mobility control when the surfactant solution is injected at less than critical velocity required for a gravity-stable displacement. The purpose of this study was to develop method predict stability floods reservoir scale on basis laboratory scale. scaleup process involves calculation appropriate average frontal flood. depends well configuration. We performed systematic...

Abstract The potential leakage of hydrocarbon fluids or CO2 out subsurface formations through wells with fractured cement debonded microannuli is a primary concern in oil and gas production storage. presence fractures annulus apertures on the order 10–300 microns can pose significant danger effective permeability range 0.1–1 mD. Leakage pathways small are often difficult for conventional oilfield to repair, thus low-viscosity sealant that be placed into these easily while providing long-term...

Abstract It is widely accepted that oil recovery during waterflooding can be improved by modifying the composition of injected brine. A typical approach diluting formation water to a specific lower salinity. However, recent experimental studies report adverse effect dilution on for oil/brine/rock systems. The depends interactions within system and more pronounced in carbonates. In this study, we investigated performance low salinity injection considering complex interplay interaction oil,...

Summary Storage of large amounts carbon dioxide (CO2) within deep underground aquifers has great potential for long-term mitigation climate change. The U.S. Gulf Coast is an attractive target CO2 storage because the favorable formation properties injection and containment CO2. Deltaic formations are one primary targeted depositional environments in Coast. In this paper, we investigate deltaic saline through a combination geological modeling flow simulation. approach presented paper based on...

Abstract Recent surfactant flooding experiments have shown very efficient oil recovery can be obtained without mobility control when the solution is injected below critical velocity required for a gravity-stable displacement. The purpose of this study was to develop method predict stability floods at reservoir scale based on laboratory scale. up process involves calculation appropriate average frontal flood. depends well configuration. We performed systematic numerical simulations effect key...

Abstract Classical stability theory predicts the critical velocity for a miscible fluid to be stabilized by gravity forces. This was tested surfactant floods with ultra-low interfacial tension and found optimistic compared both laboratory displacement experiments fine-grid simulations. The inaccurate prediction of instabilities based on available analytical models is due complex physics floods. First we simulated vertical sandpack validate numerical model. Then performed systematic...

Abstract Wellbore integrity is a critical subject in oil and gas production, CO2 storage. Successful subsurface deposition of various fluids, such as CO2, depends on the storage site. In site, injection wells pre-existing might leak due to over-pressurization, mechanical/chemical degradation, and/or poor cement job, thus reducing sealing capacity Wells that microannuli or fractures order microns are difficult seal with typical workover techniques. We tested novel polymer gelant, originally...

Summary A systematic simulation study of gravity-stable surfactant flooding was performed to understand the conditions under which it is practical and optimize its performance. Different optimization schemes were introduced minimize effects geologic parameters improve performance economics floods. The simulations carried out by use horizontal wells in heterogeneous reservoirs. results show that one can perform floods at a reasonable velocity with very-high sweep efficiencies for reservoirs...

Abstract The integrity of a geological formation is primary concern in any underground fluid injection project. Hydraulic pressurization due to may reduce fault strength, trigger slippage, and cause reactivation. reactivated affects the migration loss from zone, which might undermine efficiency safety Hence, reliable modeling reactivation critical. In this work, we propose new approach Faults are complex structures generally consist core damage zones with macroscopic fracture networks....

Abstract A systematic simulation study of gravity-stable surfactant floods has been done to understand the conditions under which it is practical and optimize its performance. Different optimization schemes have introduced minimize effects geologic parameters improve performance economics floods. The simulations were carried out using horizontal wells in heterogeneous reservoirs. results show that can be at a reasonable velocity with very high sweep efficiencies for reservoirs vertical...

Abstract Long-term integrity and practical storage of CO2 is contingent upon its seal performance the dynamic sealing capacity faults for site. Faults are prone to reactivation with reservoir pressurization caused by injection. The goal this study create verify a elasto-plastic model capable capturing short-term evolution fault resulting change permeability. This then used explore effects coupling geomechanics fluid flow on faults. In paper, we introduce workflow modeling elements as...