1,890 Results Found

The formation process of LDHs (layered double hydroxides) coating on magnesium alloy by the CO₂ pressurization method was studied. The micro-structure was observed by OM, SEM and GAXRD. The weighted gain curve, apparent activation energy, and CO₂ sol...

The establishment of a more realistic CO₂ fracturing model serves to elucidate the intricate mechanisms underlying CO₂ fracturing transformation. Additionally, it furnishes a foundational framework for devising comprehensive fracturing construction p...

In response to escalating global energy demand and climate change mitigation needs, natural gas hydrates (NGHs) are gaining prominence as a clean energy source. The CO₂ replacement method is an innovative NGH extraction technique that reduces reservo...

A longstanding concern in plant essential oil extraction is how to optimize extraction efficiency with limited materials. Supercritical CO₂ extraction has been proven effective in enhancing the yield and efficiency of extracting plant essential oils....

This study is dedicated to exploring and verifying the application of a miniature Venturi sensor for measuring the flowrate of supercritical CO₂ and associated gas in downhole environments. With the rapid development of CO₂ gas injection technology a...

Supercritical CO₂ pipeline transportation is a critical component of the carbon capture, utilization and storage (CCUS) industry chain, where long distance operation introduces inherent risks of accidental leakage. During the leakage process of super...

This study’s objective was to separate cellulose, hemicellulose, and lignin after high-pressure supercritical carbon dioxide pretreatment for further valorization. The study investigated the supercritical carbon dioxide pretreatment of apple or...

Understanding the carbon dioxide (CO₂) solubility in formation brines is of great importance to several industrial applications, including CO₂ sequestration and some CO₂ capture technologies, as well as CO₂-based enhanced hydrocarbon recovery methods...

The aim of this work was to study the fermentation of black table olives under slightly pressurized CO₂ (spCO₂). The olives were marinated in brine with a low salt content and processed using both the traditional two-phase method and a new single-pha...

ZnO nanostructures show great potential in hydrogen sensing at atmospheric conditions for good gas adsorption abilities. However, there is less research on low-pressure hydrogen sensing performance due to its low concentration and in-homogeneous dist...

In this work, we are concerned with the theoretical and numerical analysis of the pressure build-up on the cap of an aquifer during CO₂ injection in saturated porous rock formations in all flow regimes of the problem. The latter are specific regions...

The experimental solubility data of polyvinyl chloride (PVC) and high-pressure polyethylene (HPPE) in organic solvents (toluene, dichloromethane, and chloroform) at temperatures ranging from 308.15 to 373.15 K at atmospheric pressure are reported in...

As a promising technology to improve shale gas (SG) recovery and CO₂ storage capacity, the multi-well pads (MWPs) scheme has gained more and more attention. The semi-analytical pressure-buildup method has been used to estimate CO₂ storage capacity. I...

Curing by CO₂ is a way to utilize CO₂ to reduce greenhouse gas emissions. Placing early-age cement paste in a CO₂ chamber or pressure vessel accelerates its strength development. Cement carbonation is attributed to the quickened strength development,...

Fluid film bearings lubricated with supercritical carbon dioxide (sCO₂) eliminate the infrastructural requirement for oil lubricant supply and sealing in turbomachinery for sCO₂ power systems. However, sCO₂’s thermohydrodynamic properties, whic...

Geological storage of CO₂ in coal seam is an effective way for carbon emission reduction. Evaluating the adsorption-induced swelling behavior of confined coal is essential for this carbon emission reduction strategy. Based on the thermodynamic theory...

The CO₂-assisted polymer compression method is used herein to prepare porous polymer materials by bonding laminated polymer fiber sheets using a piston in the presence of CO₂. In this work, the CO₂ flow line connections were moved from the pressure v...

Carbon capture and storage (CCS) is the most promising method of curbing atmospheric carbon dioxide levels from 2020 to 2050. Accurate predictions of geology and sealing capabilities play a key role in the safe execution of CCS projects. However, pop...

The fluid disturbance effect is a significant challenge in CBM (CBM) co-production within superimposed pressure systems in China. To address the unique CBM reservoir of superimposed pressure systems, a CBM co-production experimental apparatus for mul...

Carbon dioxide (CO₂) has been used to replace coal seam gas for recovery enhancement and carbon sequestration. To better understand the alternations of coal seam in response to CO₂ sequestration, the properties of four different coals before and afte...

The diffusion characteristics of CH₄, CO₂, and N₂ in coal are important for the study of CO₂-enhanced coalbed methane (CO₂-ECBM) recovery, which has become the most potential method for carbon sequestration and natural gas recovery. However, quantita...

The CO₂ injection technology for replacing CH₄ to enhance coalbed methane (CBM) recovery (CO₂-ECBM) offers dual benefits, i.e., reducing CO₂ emissions through sequestration and increasing CBM recovery, thereby leading to economic gains. However, ther...

The existence of propane (C₃H₈) in a CO₂-oil mixture has great potential for increasing CO₂ solubility and decreasing minimum miscibility pressure (MMP). In this study, the enhanced solubility, reduced viscosity, and lowered MMP of CO₂-saturated crud...

CO₂ injection in shale reservoirs is more suitable than the conventional recovering methods due to its easier injectivity and higher sweep efficiency. In this work, Grand Canonical Monte Carlo (GCMC) simulation is employed to investigate the adsorpti...

The wet carbonation of coal gangue-based backfilling slurry (CGBS) is considered to be an effective method for the resource utilization of coal gangue solid waste and CO₂ sequestration, but CO₂ sequestration has a negative impact on the rheological p...

Hydrate formation from cyclopentane (CP) and carbon dioxide was measured at 281 K by powder X-ray diffraction (PXRD) and macroscopic methods. The effect of initial pressure and CP mass fraction in liquid phase was analyzed. The results showed that hy...

The geomechanics effects and seabed subsidence are critical issues that should be considered in the development of a hydrate reservoir. The purpose of this study is to couple the geomechanics, hydrate reaction, and multiphase fluid flow modules to in...

To protect the environment, sequestering CO₂ during the extraction of natural gas hydrates is a highly promising carbon-neutral technology. We investigated methane extraction and CO₂ storage by a combined depressurization and CO₂-injection method. In...

Melting of carbonated rocks in the mantle influences the Earth’s deep carbon cycle and the long-term evolution of the atmosphere. Previous studies of the high-pressure melting curve of K₂CO₃ have yielded inconsistent results, with discrepancies...

CO₂ geosequestration is an important contributor to United Nations Sustainable Development Goal 13, i.e., Climate Action, which states a global Net-Zero CO₂ emissions by 2050. A potential impact of CO₂ geosequestration in depleted oil and gas reservo...

In order to adapt the development of vehicle driving automation technology for driving conditions under different levels of automation and based on the independently invented LF automatic pressure regulating valve (LF-APRV) for electronically control...

The storage of carbon dioxide by injecting carbon dioxide into gas reservoirs has become an important technique for achieving carbon capture, utilization, and storage. However, most studies have focused on tight gas reservoirs, and there are still fe...

Injecting CO₂ into coal seams to enhance coal bed methane (ECBM) recovery has been identified as a viable method for increasing methane extraction. This process also has significant potential for sequestering large volumes of CO₂, thereby reducing th...

Iron ore was studied as a CO₂ absorbent. Carbonation was carried out by mechanochemical and high temperature–high pressure (HTHP) reactions. Kinetics of the carbonation reactions was studied for the two methods. In the mechanochemical process,...

The injection of CO₂ to displace CH₄ in coal seams is an effective method to exploit coalbed methane (CBM), for which the CO₂ injection temperature and pressure are important influential factors. We performed simulations, using COMSOL Multiphysics to...

Accurate prediction of the temperature and pressure fields in carbon dioxide (CO₂) injection wells is critical for enhancing oil recovery efficiency and ensuring safe carbon sequestration. At present, the prediction model generally assumes that CO₂ i...

CO₂ fracturing has unparalleled advantages in the reservoir reform which can significantly improve oil and gas recovery in unconventional oil and gas resources. The wellbore flow behavior is one of the fundamental issues of CO₂ fracturing. A model of...

The CH₄-CO₂ replacement method has attracted global attention as a new promising method for methane hydrate exploitation. In the replacement process, the mechanical stabilities of CH₄ and CO₂ hydrate-bearing sediments have become problems requiring a...

Tubular string temperature and pressure are important parameters in string mechanics analysis. Thus, accurately calculating temperature and pressure in the injection process is fundamental for analyzing the tubular string mechanics of CO₂ injection w...

Carbon monoxide (CO) poisoning is the leading cause of poisoning-related deaths globally. The currently available therapy options are normobaric oxygen (NBO) and hyperbaric oxygen (HBO). While NBO lacks in efficacy, HBO is not available in all areas...

In heavy oil thermal recovery processes, higher pressure usually leads to low dryness and expansion difficulty for the injected steam in thermal recovery processes, which will result in lower oil recovery and more carbon emissions. This paper propose...

Geological carbon storage is an effective method capable of reducing carbon dioxide (CO₂) emissions at significant scales. Subsurface reservoirs with sealing caprocks can provide long-term containment for the injected fluid. Nevertheless, CO₂ leakage...

The co-application of water, fertilizer, and air is a new water-saving irrigation method based on drip irrigation technology, which can effectively alleviate the phenomenon of soil rhizosphere hypoxia, improve water and fertilizer utilization efficie...

CO₂ sequestration in sediments as solid hydrate is considered a potential way to capture and store anthropogenic CO₂. When CO₂ hydrate is formed in front of CO₂ migration, the injection channel will be blocked, and the removal of hydrate blockage bec...

CO₂-enhanced gas recovery (EGR) has emerged as a promising method for improving hydrocarbon production and achieving carbon sequestration in offshore gas reservoirs. This study investigates the performance and influencing factors of CO₂-based gas dis...

The fabrication of WC-based cemented carbides faced challenges including inhomogeneous composition and grain coarsening. To solve these problems, WC–Co cemented carbides were fabricated via spark plasma sintering (SPS) using core–shell WC...

In view of the problems of low matrix permeability and low oil recovery in shale reservoirs, CO₂ huff and puff technology is considered as an effective method to develop shale oil reservoirs. However, the production behaviors of actual shale reservoi...

With the characteristics of low fracturing pressure, little damage to the reservoirs, and assuming the role of carbon storage, supercritical carbon dioxide (SC-CO₂) fracturing is suitable for the development of unconventional oil and gas resources. B...

CO₂ flooding is an important method for improving oil recovery for reservoirs with low permeability. Even though CO₂ could be miscible with oil in regions nearby injection wells, the miscibility could be lost in deep reservoirs because of low pressur...

CO${}_2$ injection technology into coal seams to enhance CH${}_4$ recovery (CO${}_2$-ECBM), therefore presenting the dual benefit of greenhouse gas emission reduction and clean fossil energy development. In order to gaze into the features of CO${}_2$ injection’s i...