CO2 flooding is widely recognized as an efficient way of developing tight reservoirs. Multiple types minerals in rocks may interact with introduced CO2, resulting more complex mechanisms reserve recovery from It necessary to reveal the impact core on oil recovery, which critical understanding fundamental for enhanced recovery. In this work, 18 samples, retrieved Changqing oilfield, are characterized obtain their mineral compositions. Three typical samples then selected conduct and...

After water flooding development in ultralow permeability reservoirs, connected channels formed under high injection pressure will reduce the effectiveness of oil recovery and CO2 storage. Based on geological characteristics megaton-scale carbon capture, utilization, storage (CCUS) project implemented Changqing Oilfield, we propose an innovative method for characterizing breakthroughs based correlation between gas breakthrough. We also implement zoning control optimization to achieve goal...

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...

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...

How to reduce surfactant adsorption on a rock surface is challenging task because would negatively affect the performance of surfactants in enhanced oil recovery. This study thoroughly investigates effects various deep eutectic solvent (DES) samples adsorption. The amounts are quantitatively determined by measuring variations tensions solutions before and after experiments. First, pure DES solution at different concentrations measured. results suggest that prepared cannot alter tension...

Gel systems are widely used as plugging materials in the oil and gas industry. Gas channeling can be mitigated by reducing heterogeneity of formation mobility ratio CO2 to crude oil. Cracks other leaking pathways plugged during geological storage increase stability. By adding CO2-responsive groups classic polymer gel’s molecular chain, responsive gel is able seal recognize while maintaining superior performance traditional gel. The application gels production still stage laboratory testing...

Comprehensive knowledge of the absolute adsorption light hydrocarbons and CO2 is significant for shale reservoir assessment stimulation optimization. In this work, excess isotherms are first obtained CH4, n-C4H10, on typical shale. The simplified local density (SLD) theory then used to obtain adsorption-phase in organic pores, which employed calculation. compared prove potential hydrocarbon recovery as well sequestration reservoirs. results show that can form layers result a much higher...

The Longmaxi Formation is considered to be a potential shale gas reservoir in Sichuan Basin of China. In this work, 28 typical core samples are collected from the and comprehensive characterization geophysical petrochemical properties these obtained. Thermogravimetric method applied measure excess CH4 adsorption on samples; adsorbed density then calculated using grand canonical Monte Carlo simulation method, which consequently used determine absolute adsorption. Based converted adsorption,...

Molecular dynamic simulation is employed to investigate the fluid distribution of pure hydrocarbons, i.e., C1, C2, nC3, nC4, and nC5, in a hydrocarbon-wetting nanopore. SO2 CO2 are then introduced into this nanopore explore how affect hydrocarbon adsorption an organic pore. Adsorption selectivity replacement efficiency over hydrocarbons subsequently calculated compared with those CO2. The performance enhancing recovery from nanopores thus evaluated. After introducing or...

Preparation of biodiesel using in situ transesterification has been extensively conducted for agricultural, microbial and algal biomass, while few works have performed aquatic animal tissue. In this work, fish processing wastes were collected to perform grass carp (Ctenopharyngodon idellus) biomass as a representative with which optimize the reaction conditions. Under optimum condition, highest purity reached up 100% sea bass wastes, is higher than 96.5% specified EN 14214-2008. The method...

Accurately determining the adsorbed amount of CH4 on shale is significant for understanding mechanisms gas storage and methane recovery from reservoirs. Excess adsorption measured using thermogravimetric method. Simplified local density (SLD) theory applied to calculate obtain absolute adsorption. Moreover, modified Langmuir model employed fit excess describe The SLD affected by system pressure temperature, while such obtained only a function temperature. Compared model, can better capture...

Understanding the adsorption/desorption behavior, as primary phenomenon in shale reservoirs, is crucial for resource production, which necessary approximating gas-in-place estimation. CH4 and C2H6 gas are two common dominating components. We first measure isotherms of at temperatures 313.15–333.15 K. The maximum operating pressures 50 30 bar, respectively. Relationships physical properties core samples with adsorption capacities analyzed. In addition, accuracy four popular models, i.e.,...

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Abstract Injecting CO2 into shale reservoirs can enhance gas recovery and store to help mitigate global warming. Orthoclase is a key mineral in reservoirs. To understand the competitive adsorption mechanism of CO2/CH4 mixtures orthoclase nanopores under various conditions, we employed molecular simulations. Using three different nanopore models—dry, water-containing, rough—we studied behavior CO2, CH4 single component their binary pores with Grand Canonical Monte Carlo (GCMC) method. We...

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The Baikouquan Oilfield is entering middle and later periods of development. Casing failure, caused by the quality cementing casing corrosion, affects normal production well. number wells in this situation has been increasing recent years. Some with a high aquifer have no way to achieve effective plugging. conventional measures short validity low plugging strengths. They cannot meet requirements subsequent fracturing operations long-term production. Therefore, new type agent strength,...

With an increasingly tight supply of world energy resources, unconventional oil and gas including shale gas, coal-bed sandstone have attracted much attention [...]