Multiscale investigation into EOR mechanisms and influencing factors for CO2-WAG injection in heterogeneous sandy conglomerate reservoirs using NMR technology
Available online 2 April 2025
The sandy conglomerate reservoir is tight and exhibits strong heterogeneity, rendering conventional water flooding and gas drive methods inefficient and challenging for the effective development. CO2...
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Multidimensional data-driven porous media reconstruction: Inversion from 1D/2D pore parameters to 3D real pores
Available online 2 April 2025
Subsurface rocks, as complex porous media, exhibit multiscale pore structures and intricate physical properties. Digital rock physics technology has become increasingly influential in the study of subsurface...
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Simultaneous seismic inversion of effective stress parameter, fluid bulk modulus, and fracture density in TTI media
Available online 2 April 2025
Predictions of fluid distribution, stress field, and natural fracture are essential for exploiting unconventional shale gas reservoirs. Given the high likelihood of tilted fractures in subsurface formations,...
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Correlating the carbonic acid reaction with tight sand and pure minerals during geological carbon storage
Available online 1 April 2025
CO2 injection into geological formations has been proven to be an effective approach for carbon storage. When dissolved in formation water, CO2 forms carbonic acid that induces mineral dissolution at...
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Study on the effect of clay minerals on phase transition of methane hydrate in sand sediments: Kinetic behavior and microstructural observation
Available online 1 April 2025
Natural gas hydrates widely accumulate in submarine sediments composed of clay minerals. However, due to the complex physiochemistry and micron-sized particles of clay minerals, their effects on methane...
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Biomass thermal decomposition induced hydrogen sulfide blooming in thermal recovery reservoirs
Available online 1 April 2025
High concentration of secondary hydrogen sulfide (sH2S) in thermal recovery reservoirs of Liaohe Oilfield, NE China was concluded to originate from thermochemical sulfate reduction (TSR), and no biotic...
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A novel optimization scheme for structure and balance of compound balanced beam pumping units using the PSO, GA, and GWO algorithms
March 2025
The beam pumping unit (BPU) remains the most stable and reliable equipment for crude oil lifting. Despite its simple four-link mechanism, the structural design of the BPU presents a constrained single-objective...
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Water adsorption performance of over-mature shale and its relationship with organic and inorganic nanopores: A case study of Lower Cambrian shale from the Sichuan Basin, China
March 2025
The water adsorption performance of shale gas reservoirs is a very important factor affecting their gas in place (GIP) contents, but the water-holding capacity and mechanism of over-mature shale, especially...
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Evaluation of cement density utilizing through-casing X-Ray logging method
March 2025
In the evaluation of cementing quality, quantitatively assessing cement density is crucial along with identifying the cementation degree at the interface using acoustic logging. While the 137Cs-based...
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Mesoporogen-free synthesis of hierarchical SAPO-11 from kaolin for hydroisomerization of n-alkanes
March 2025
Hierarchical SAPO-11, featuring both micropore and mesopore channels, demonstrates an outstanding performance in high-octane gasoline production. In this work, we propose an economic and effective approach...
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Self-supervised simultaneous deblending and interpolation of incomplete blended data using a multistep blind-trace U-Net
March 2025
Blended acquisition offers efficiency improvements over conventional seismic data acquisition, at the cost of introducing blending noise effects. Besides, seismic data often suffers from irregularly...
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Damage mechanism analysis of polymer gel to petroleum reservoirs and development of new protective methods based on NMR technique
March 2025
Polymer gels are widely used in water control and enhanced oil recovery in oil fields. However, the damage mechanism of polymer gels to layers with remaining oil and not requiring plugging and corresponding...
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Experimental study of EOR mechanisms of non-chemical CO2 microbubbles and their impact on pore structures
March 2025
Non-chemical CO2 microbubbles as a mobility control technology in enhanced oil recovery (EOR) and carbon sequestration are becoming attractive. In this study, the EOR mechanisms of non-chemical CO2...
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Rock breakage and temperature rising of rock cutting after high-temperature treatment
March 2025
Geothermal energy is a clean and ecologically friendly energy source with significant potential. The temperature variations between the Polycrystalline Diamond Compact (PDC) cutter and the rock of the...
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Insights into the pore structure and hydrocarbon accumulation of lacustrine organic-rich shales
March 2025
With the development of unconventional hydrocarbon, how to improve the shale oil and gas recovery become urgent. Therefore hydraulic fracturing becomes the key due to the complicated properties of the...
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Formation mechanism and reservoir quality evaluation in tight sandstones under a compressional tectonic setting: the Jurassic Ahe Formation in Kuqa Depression, Tarim Basin, China
March 2025
The northern structural belt of Kuqa Depression is adjacent to the South Tianshan orogenic belt, which are characterized by complex geological conditions. The reservoir quality of the Jurassic Ahe Formation...
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Morpho-dynamics in fan deltas: Effect of topography on flow transformation, facies distribution and graded profile evolution, a case study in XLG fan delta
March 2025
Fan deltas are usually constructed through episodic flood event with debris flow transforming to hyper-concentrated flow during sediments proceeding. However, the role of topography in controlling the...
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March 2025
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A robust seismic wavefield modeling method based on minimizing spatial simulation error using L2-norm cost function
March 2025
To reduce the spatial simulation error generated by the finite difference method, previous researchers compute the optimal finite-difference weights always by minimizing the error of spatial dispersion...
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Experimental investigation into CO2 huff-n-puff in low-permeability heavy oil reservoirs: Role of fractures
March 2025
Low-permeability heavy oil reservoirs are characterized by poor flowability, generally mandating hydraulic fracturing to commence production. CO2 huff-n-puff in fractured reservoirs is an effective...
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Research on the pollution and damage mechanism of drilling fluid on casing during ultra-deep well drilling process
March 2025
In drilling ultra-deep wells, the drilling fluid circulation usually causes erosion damage to downhole casing and drilling tools. However, the extent and process of this damage to the downhole tools...
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Mechanism of proppant transport and deposition in rough intersecting fractures after offshore fracturing
March 2025
To accurately analyze proppant transport in rough intersecting fractures and elucidate the interaction mechanisms among liquid, particles, and rough walls, this study reconstructed a numerical model...
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Energy and heat transfer analysis on the heating process of crude oil tank with mechanical stirring
March 2025
Taking into account the characteristics of non-Newtonian fluids and the influence of latent heat of wax crystallization, this study establishes physical and mathematical models for the synergy of tubular...
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Geological-engineering comprehensive evaluation model and application of feasibility of hydraulic fracturing in hydrate-bearing sediments
March 2025
Natural gas hydrates (hereinafter referred to as hydrates) are a promising clean energy source. However, their current development is far from reaching commercial exploitation. Reservoir stimulation...
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Coupling mechanism analysis of CO2 non-Darcy flow in multi-scale reservoirs: A case study of the life-cycle process of fracturing-development in shale oil reservoirs
March 2025
With policy support for carbon capture, utilization, and storage (CCUS), an integrated approach that combines energy storage fracturing, CO2-enhanced oil recovery (EOR), and storage emerges as a promising...
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