Energy & Fuels最新文献

Conventionalpolymers often undergo viscosity loss and performancedeterioration in high-temperature and high-salinity reservoirs. Anovel microbial polysaccharide system developed from an engineeredoil-recovery strain exhibits good temperature and salt tolerance aswell as strong mobility-control capacity, indicating its potentialas an oil-displacement agent. Here, we examine how adsorption andretention in porous media contribute to its mobility-control behaviorunder high-temperature and high-salinity conditions. The polysaccharideshowed concentration-dependent shear-thinning behavior at 85 °Cin formation water and significantly enhanced flow resistance duringcore flooding, with a maximum resistance factor of 13.05 while maintaininga moderate residual resistance factor of 1.93–2.4. Dynamicretention increased with polysaccharide concentration and decreasedwith injection rate, reaching a maximum of 0.43 mg/g. Static adsorptionfollowed Langmuir-type behavior (R² >0.98, Langmuir affinity constant K_L =9.6 L/mg), suggesting strong polymer-mineral affinity, and single-mineraladsorption further showed preferential adsorption on clay minerals.These results indicate that adsorption and retention contribute tothe flow-resistance behavior of this polysaccharide in high-temperatureand high-salinity porous media, providing a basis for its applicationin polymer flooding under harsh reservoir conditions.

Methane-dominantgas hydrate formation can restrict offshoreproductionlines, alter pressure response, and interrupt natural-gas transport.Laboratory studies have established that hydrate growth depends onkinetic driving force, mass transfer, heat transfer, and hydrodynamicconditions, whereas field-data sets usually contain pressure, temperature,and flow signatures without direct hydrate-inventory measurements.This study presents a physics-informed framework for evaluating hydraterestriction signatures in offshore well data by combining robust fieldsignal scoring with a one-dimensional transient transport-restrictionmodel. Petrobras 3W class 0 data were used to define normal-operationbaselines, while all 13 usable real-well class 8 and class 9 hydratecases were used for validation. The Hydrate Anomaly Index achievedmedian event-window F1 = 0.889, median recall = 1.000, and medianfalse-alarm rate = 0.051. In prospective replay, using only precedingnormal-operation data to set thresholds, the framework achieved amedian F1 = 0.974 and median false-alarm rate = 0.011, with sustainedalarms occurring before the final hydrate-event label in 11 of 13cases. Monte Carlo uncertainty analysis showed that the pressure-dropresponse was controlled mainly by flow velocity and geometry, whilethe outlet hydrate-fraction response was controlled mainly by apparentkinetic and deposition parameters. The framework does not estimatethe exact hydrate mass or deposit morphology. Its value is a reproducible,field-evaluated pathway for connecting hydrate-growth concepts withoperational restriction signatures in offshore natural-gas productionsystems.

Underinhibitedmonoethylene glycol (MEG) operation isincreasinglyconsidered for hydrate management in natural gas production and transportation,but the associated plugging risk depends not only on hydrate formationextent but also on how hydrates grow, agglomerate, and evolve intoflow-blocking structures. In this work, hydrate formation and pluggingexperiments were conducted in a high-pressure visual rocking cellto examine the effects of MEG concentration, temperature, and pressureon natural gas hydrate plugging behavior. Hydrate plugging in underinhibitedMEG systems was classified into three regimes: rapid plugging, delayedplugging, and stable slurry. The delayed plugging regime was furtherdivided into wall-growth and local-accumulation pathways. At 6.6 MPa,increasing temperature from 2 to 6 °C narrowed the rapid pluggingregime from 0–15 wt % MEG to 0–5 wt % MEG and shiftedthe stable slurry regime from 30–35 wt % to 20–25 wt% MEG. In contrast, at 4 °C, increasing pressure from 6.6 to11 MPa expanded the rapid plugging regime from 0–10 wt % to0–20 wt % MEG and nearly eliminated the stable slurry regime.Distinct kinetic signatures were also observed, with rapid plugginggenerally showing higher and more concentrated peaks in the instantaneousgas consumption rate. These results demonstrate that underinhibitedMEG regulates hydrate plugging by altering hydrate formation, particleagglomeration, wall adhesion, and kinetic pathways toward flow blockage,providing experimental insight into hydrate-control strategies fornatural gas flow assurance.

The cleavage of recalcitrant methylene linkages in technicalligninis critical for its valorization but remains inefficient due to poormass transfer in microporous catalysts. Here, we report a simple alkalinedesilication treatment of commercial Hβ zeolite that createsopen mesopores without compromising acidity. The resulting hierarchicalcatalyst enhances oligomer diffusion, boosting the yield of monomericand dimeric phenolics from the depolymerization of five technicallignin oligomers to 9.8–25.2 wt %, which is a 1.9- to 2.7-foldincrease relative to conventional hydrogenolysis that only cleavesC–O bonds. Complete hydrodeoxygenation of these phenolics yieldsa mixture of mono- and bicyclic cycloalkanes with a carbon-number(C₉–C₂₀) distribution overlapping thatof Jet-A fuel, highlighting their potential as drop-in blending componentsfor sustainable aviation fuel. This work provides a scalable, cost-effective,and green catalytic route that directly addresses the mass-transferbottleneck in technical lignin depolymerization.

Natural gas hydrate (NGH) production by depressurizationcan beconstrained by the temperature decline associated with endothermichydrate dissociation and the resulting potential for secondary hydrateformation. To address these limitations, this study investigates electricalresistance heating (ERH), which generates Joule heat within hydrate-bearingsediments. A laboratory-scale electrical–thermal–hydraulic–chemical(ETHC) coupled model is developed, incorporating Joule heating, multiphaseflow, heat transfer, and hydrate dissociation kinetics. Followingvalidation against the Masuda core experiment, three production scenariosare compared: depressurization alone (Case A), depressurization combinedwith ERH (Case B), and depressurization combined with ERH and externalthermal replenishment (Case C). Under a constant external boundarytemperature of 273.15 K, gas production in Case A declines rapidlyas dissociation-induced cooling inhibits further hydrate dissociation.ERH in Case B promotes dissociation within the core, although thesame boundary temperature continues to constrain dissociation nearthe periphery. In Case C, raising the external boundary temperatureto 280.15 K alleviates this constraint and promotes more spatiallyextensive hydrate dissociation. Compared with Case B, Case C increasesthe peak gas production rate by 64% and accelerates the dissociationprocess. These results clarify the combined effects of internal Jouleheating and external thermal replenishment on hydrate dissociationunder idealized laboratory-scale thermal boundary conditions.

Considering that the combustion of fossil fuels is theprimarysource of CO₂ emission, it is crucial to focus on postcombustioncarbon capture. Deep eutectic solvents (DES) are potential CO₂ absorbents. However, research overemphasizes their absorptioncapacity, thus lacking comprehensiveness. In this work, eight DESswere prepared. 1,5-Diazabicyclo[4.3.0]non-5-ene (DBN), benzimidazole(Benz), and 2-oxazolidone (Oxa) were selected to form [DBN][Benz]and [DBN][Oxa] as hydrogen bond acceptors and ethylene glycol (EG)as the hydrogen bond donor. The research aims to establish a comprehensiveevaluation system for DES nonaqueous absorbents based on excellentabsorption performance, fast absorption rate, and excellent cycleperformance, with low-regeneration energy consumption as the guidingprinciple. It also considers good thermal stability and low/no ecologicaltoxicity. It has been measured that 1 g of [DBN][Oxa]–EG (1:0.5)could absorb 0.1679 g of CO₂ and the regeneration energyconsumption could reduce by 70.41% compared to that of 30 wt % monoethanolamine.The absorption ability of EG is activated to generate carbonate insteadof carbamate, which is metastable and thus helps reduce energy consumption.

The use of industrial wastes as oxygencarriers (OCs) in chemicallooping combustion (CLC) has gained recent attention as these materialsdemonstrate the potential to be a cost-effective alternative to syntheticOCs. A key limitation in the development of CLC with industrial wasteOCs is the lack of modeling efforts for CLC systems with these materials.This work presents a dynamic multiscale packed-bed reactor CLC modelof the oxidation and reduction stages to investigate the performanceof red mud, an industrial waste from the alumina refining industry,as an OC. Kinetics describing the oxidation reaction of red mud withoxygen and the reduction reactions of red mud with CH₄,CO, and H₂ fuels were fitted and assessed using lab-scaleexperimental data. To further advance CLC with red mud, the packed-bedmodel is used to design a pilot-scale CLC system, following scalingconstraints and design heuristics. The proposed pilot-scale designexhibits moderate utilization of the red mud OC, an average of 89%fuel conversion during the dynamic reduction stage, and is estimatedto produce a total thermal energy output of 235.6 kWh. Evaluationof the red mud performance under various reactor conditions at pilotscale provides valuable insights into the potential for this industrialwaste to advance CLC toward industrial relevance and adoption.

Sustainableaviation fuel (SAF) has become a strategicgoal forglobal aviation decarbonization. However, the transition of the conventionaljet fuel toward higher-blend and fully formulated SAF remains challenging.Aromatics are a critical component and/or additive in jet fuel, owingto their capability for increasing fuel density, elastomer compatibility,and combustion performance. Lignocellulosic biomass, waste plastic,waste oils, and sugar-derived furanics are outstanding candidatesfor sustainable aromatics for SAF, but the conversion techniques ofthose feedstocks remain premature. This critical review provides acentralized framework evaluating those waste-to-aromatics methodsunder both thermochemical and biochemical pathways. Fast pyrolysis,hydrothermal liquefaction, catalytic cracking, reductive depolymerization,microbial depolymerization, and enzymatic conversion are comparedby exercising common criteria (i.e., operating conditions, productdistribution, aromatic selectivity, and technological maturity, etc.).Based on the past majority of reviews that evaluate pathways overinconsistent system boundaries, functional units, and assumptionsin life-cycle and techno-economic assessments, this work brings pathwaycomparisons into a centralized framework for sustainable aromaticand SAF-relevant hydrocarbon production. We have paid particular attentionto catalyst deactivation and regeneration, hydrogen utilization inhydrodeoxygenation, and the distinction between producing aromaticintermediates and subsequent upgrading to an ASTM-approved aviationfuel blendstock. With the insights guiding potential future research,the produced aromatic SAF candidates could serve as a missing pieceof the puzzle to complete SAF blending in modern jet engines.

Late-stage tectonic deformation strongly influences shale-gaspreservationand redistribution, but conventional methods rarely resolve gas-migrationpathways and directions. Here, we test whether the direction of spatialcarbon-isotope gradients can indicate the dominant direction of gasmigration. We examine carbon isotopes of methane and ethane in theJiaoshiba, Dongxi, and Pengshui blocks of the southeastern SichuanBasin. These blocks have contrasting tectonic configurations but sharethe Wufeng–Longmaxi shale-gas system. We integrate the isotopedata with multiscale pore-structure characterization and formation-pressuremeasurements. In the three selected shale samples, diffusion-dominatednanopores below 25 nm accounted for 7.8–13.2% of the measuredpore volume and provided the physical basis for interpreting isotopefractionation. At Jiaoshiba, methane δ¹³C becomesheavier toward faults, consistent with preferential vertical escapeof ¹²CH₄. At Dongxi, ethane δ¹³C differs markedly between structural highs and deep sags, whereasmethane δ¹³C remains comparatively uniform. Thiscontrast is consistent with migration-related separation of oil-crackingand kerogen-cracking gas. At Pengshui, the well closer to the outcrophas lighter methane δ¹³C, defining a preliminarytwo-well pattern opposite to that at Jiaoshiba. Together, these observationssupport the use of spatial isotope patterns, interpreted in lightof formation pressure and tectonic context, as potential indicatorsof gas migration pathways and preservation conditions.

Optical methods are widely used to evaluate foam stability,buttheir signals integrate liquid drainage, phase redistribution, bubble-sizeevolution, and coalescence, limiting mechanism-specific interpretation.This study applies a measurement-aware, multidescriptor strategy combiningbench-scale Turbiscan screening, an independent high-pressure CO₂-foam visual-cell campaign, and porous-media core-flood evaluation.At 30, 45, and 60 °C, initial gas entrainment, liquid drainage,apparent optical bubble evolution, foam–liquid boundary migration,regional backscattering variation, and the Turbiscan Stability Indexwere evaluated. High-pressure CO₂-foam performance wasindependently assessed over 12–22 MPa using maximum foam volumeand foam half-life. Increasing temperature enhanced initial gas entrainmentbut accelerated subsequent structural aging, as indicated by fasterdrainage, earlier boundary migration, a higher apparent cubic-radiusevolution coefficient, and greater cumulative optical variation. Theapparent cubic-radius evolution coefficient increased from 1.14 ×10⁵ to 2.27 × 10⁵ μm³·min^–1 between 30 and 60 °C. In the high-pressure campaign,increasing target pressure under the adopted density-based chargingprotocol was associated with higher maximum foam volume and longerhalf-life, although the adverse effect of elevated temperature remained.Because CO₂ inventory, surfactant-stock charge, and ethanolcontent covaried with target-state CO₂ density, this trendis interpreted as a combined pressure–charge/formulation responserather than an isolated thermodynamic pressure effect. At 22 MPa,increasing temperature from 30 to 60 °C reduced the maximum foamvolume from approximately 1190 to 865 mL and the half-life from 198to 125 min. The core-flood experiments provided initial porous-mediaevidence: CO₂/E-1340 foam increased the final oil recoveryfactor to 53.24%, compared with 40.79% for CO₂ floodingand 26.97% for brine flooding. During foam treatment, the differentialpressure increased from 0.26 to 2.68 MPa and stabilized at 1.98 MPaafter treatment, corresponding to a resistance factor of 10.308 anda residual resistance factor of 7.615. These results extend the bulk-celland high-pressure screening observations to initial porous-media evidenceof increased flow resistance and improved displacement performanceunder the tested conditions. Broader validation using additional reservoir-fluidsystems and multiple core conditions, together with experiments thatindependently decouple pressure from CO₂ inventory, remainsnecessary before the results can be generalized to formation-specificEOR or CCUS applications.