Field experience indicates that hydrates formed in pipelines/wellbore may result severe conduit blockage and other safety problems oil/gas development. For gas-dominated systems, one key step to address the hydrate is coupling of multiphase flow behavior (formation, deposition, etc.), which has not been well studied so far. In this paper, a hydro-thermo-hydrate model for system developed by considering interactions between occurrence described as layer growth from deposition on wall. The...

Summary Combining low-salinity-water (LSW) and polymer flooding was proposed to unlock the tremendous heavy-oil resources on Alaska North Slope (ANS). The synergy of LSW demonstrated through coreflooding experiments at various conditions. results indicate that high-salinity (HSP) (salinity = 27,500 ppm) requires nearly two-thirds more than low-salinity (LSP) 2,500 achieve target viscosity condition this study. Additional oil recovered from after extensive high-salinity-water (HSW) [3 9%...

Injecting CO2 into hydrocarbon reservoirs can enhance the recovery of resources, and simultaneously, be stored in reservoirs, reducing considerable amount carbon emissions atmosphere. However, injected tends to go through fractures, high-permeability channels streaks present resulting inefficient coupled with low storage performance. Conformance treatments CO2-resistant crosslinked polymer gels were performed this study mitigate channeling issue promote synergy between enhanced oil (EOR)...

Summary In recent years, shale and tight reservoirs have become an essential source of hydrocarbon production since advanced multistage horizontal drilling techniques were developed. Tight oil contain huge reserves but suffer from low recovery factors. For reservoirs, CO2-water alternating gas (CO2-WAG) is one the preferred tertiary methods to enhance overall cumulative while also sequestering significant amounts injected CO2. However, evaluation CO2-WAG strongly dependent on injection...

It is acknowledged that injecting CO2 into oil reservoirs and saline aquifers for storage a practical affordable method sequestration. Most produced from industrial exhaust contains impurity gases such as H2S might impact sequestration due to competitive adsorption. This study makes commendable effort explore the adsorption behavior of CO2/H2S mixtures in calcite slit nanopores. Grand Canonical Monte Carlo (GCMC) simulation employed reveal CO2, well their binary Results show increase...

CO2-enhanced oil recovery (CO2-EOR) is a potential CO2 capture, utilization, and storage technology. In particular, can break the hydrochemical balance of water–rock converts into carbonate minerals which are most stable sequestration phase. The reactions complex kinetic processes because rate dissolution/precipitation vary with pH formation water. However, studies on effect geochemical CO2-EOR lacking, fate cannot be accurately quantified. this study, we combine characteristics phase...

Summary The existence of high conductivity features such as fractures, karst zones, and void space conduits can severely restrict the sweep efficiency waterflooding or polymer flooding. Preformed particle gel (PPG), a cost-effective technology, has been applied to control excessive water production. However, conventional PPG limited plugging in high-temperature reservoirs with large fractures conduits. After breakthrough, particles easily be washed out from because lack particle-particle...

Summary Polymer flooding has been widely used to improve oil recovery. However, its effectiveness would be diminished when channels (e.g., fractures, fracture-like channels, void-space conduits) are present in a reservoir. In this study, we designed series of particular sandwich-like channel models and tested the applicable conditions micrometer-sized preformed particle gels (PPGs, or microgels) improving polymer-flooding efficiency. We studied selective penetration placement microgel...

Summary Injecting CO2 into reservoirs for storage and enhanced oil recovery (EOR) is a practical cost-effective strategy reducing carbon emissions. Commonly, CO2-rich industrial waste gas used as the source, whereas contaminants such H2S may severely impact EOR via competitive adsorption. Hence, adsorption behavior of CH4, CO2, in calcite (CaCO3) micropores on sequestration methane are specifically investigated. The Grand Canonical Monte Carlo (GCMC) simulations were applied to study...

Summary Hydrate-associated problems pose a key concern to the oil and gas industry when moving toward deeper-offshore reservoir development. A better understanding of hydrate-blockage-development behavior can help flow-assurance engineers develop more-economical environmentally friendly hydrate-management strategies for deepwater operations. In this work, model is proposed describe hydrate-blockage-formation in testing tubing during deepwater-gas-well testing. The reliability verified with...

Summary Gel treatment is an effective way to attack excessive water production during oil development. The transport behavior of gel materials in reservoirs crucial importance the effectiveness treatments. aim this paper investigating swellable micrometer-sized preformed particle gels (PPGs, or microgels) through superpermeable (super-K) channels. Sandpacks with permeabilities ranging from 27 221 darcies were used mimic super-K Multiple pressure sensors applied along sandpack models monitor...

Many studies have focused on the drag reduction performance of slick-water, but microdrag mechanism remains unclear since microstructure reducer and its effect this not been well studied. In study, in slick-water was effectively characterized by transmission electron microscopy. The viscoelasticity with different microstructures were then investigated. Further, effects analyzed. results demonstrated that is governed reducer, which exhibits a network structure. addition, related to...

Abstract Injecting CO2 into reservoirs for storage and enhanced oil recovery (EOR) is a practical cost-effective strategy achieving carbon neutrality. Commonly, CO2-rich industrial waste gas employed as the source, whereas contaminants such H2S may severely impact EOR via competitive adsorption. Hence, adsorption behavior of CH4, CO2, in calcite (CaCO3) micropores on sequestration methane are specifically investigated using molecular simulation. The Grand Canonical Monte Carlo (GCMC)...

Abstract The current dominant method to handle hydrate associated problems during deepwater gas well testing is injecting massive inhibitors (e.g. methanol and glycol). This technique uneconomical environmentally harmful. A model established assess when where a blockage would occur in the tubing. characteristics of formation deposition tubing are analyzed based on recent published gas-dominated flowloop investigations. growth film formed walls modeled. used estimate amount hydrates (on...