The low concentration and poor reservoir properties of natural hydrogen suggest that reservoir stimulation measures such as fracturing are required for its efficient development. Nevertheless, the presence of reservoir imperfections, including hard and soft cores, can significantly affect fracture behavior during the fracturing operations. Moreover, there is currently a lack of relevant simulation and experimental studies addressing these effects. In the present work, the effects and mechanisms of hard cores on fracture propagation in natural hydrogen reservoirs in the Songliao basin were numerically simulated. In addition, various factors affecting propagation behavior of fracture were also... More >

The flow resistance of displacement fluids within reservoir fractures directly influences oil recovery efficiency and sweep efficiency, thereby exerting a substantial impact on reservoir recovery and overall oilfield production. To address the significant flow resistance of contemporary displacement fluids, this study developed a multi-performance evaluation apparatus capable of simultaneously measuring fluid viscosity, flow resistance, and displacement efficiency. The effects of various reservoir parameters and fluid compositions on flow resistance and sweep area were systematically analyzed. Elevated reservoir temperatures clearly reduce fluid flow resistance within fractures, allowing dis... More >

Heavy oil reservoirs represent an important resource for alleviating energy shortages and supporting global economic development. This investigation explores the influence of a nano vanadium acid catalyst (NVR) and reservoir conditions including temperature, pressure, and shear rate on the apparent viscosity and rheological properties of crude oil during the underground extraction process. NVR was synthesized by loading vanadate active groups onto nano-SiO$_2$ particles via hydrothermal reaction. The results indicate that 0.3~wt% NVR achieves a maximum viscosity reduction rate of 60%, significantly outperforming the commercially available viscosity reducer CVR under identical conditions. Amo... More >

The low temperatures in the deepwater area are associated with a high risk of hydrate formation and flowline blockages in the wellbore and pipelines during the long-term development of gas reservoirs. The occurrence of this risk is required to be prevented and controlled to facilitate the safe and efficient development of offshore gas reservoirs. In this study, a numerical model was developed and solved to calculate the temperature and pressure distributions within wellbore and gathering system, and its applicability was evaluated. The comparison with experimental results verifies that the model is appropriate for predicting temperature and pressure distributions in the wellbore and gatherin... More >

Low fracturing efficiency and high permeability filtration present substantial challenges during the fracturing development of coalbed methane (CBM), significantly hindering its efficient exploitation. In this study, a cross-linker featuring specific polar functional groups on its side chains was synthesized, and a multi-functional coupling evaluation apparatus was developed to systematically investigate the performance characteristics of water-based fracturing fluids. Furthermore, molecular dynamics simulations were employed to elucidate the microscopic mechanisms by which the modified cross-linkers and various external factors influence CBM extraction efficiency. The results indicated that... More >

The depleted gas reservoirs can serve not only as sites for CO$_2$ sequestration but also as potential spaces for hydrogen storage. However, this process remains insufficiently understood, limiting the availability of reliable technical guidance for injection operations. In this study, a mathematical model for simulating hydrogen storage in depleted gas reservoirs was developed and numerically solved. Meanwhile, the applicability was then verified through comparison with results from previous studies. Based on this model, a detailed analysis was performed to investigate the evolution of key parameters under specific injection conditions. Finally, the effects of various factors on parameters... More >

The geothermal resources present within the reservoir post-oil production in the oil field have hitherto been overlooked and underdeveloped, constituting a novel energy supplement for the maintenance of energy security. The present study constructed a geothermal transmission and exploitation model for oil reservoirs based on the geological environment and the characteristics of geothermal transmission media. This model can be used to analyse the impact of different factors on the efficiency of reservoir geothermal resources. Concurrently, a molecular dynamics model was constructed to reveal the geothermal transmission mechanism at a microscopic perspective, which will facilitate the optimisa... More >

Reservoir Science (RS) journal represents a significant milestone in the pursuit of energy extraction, energy storage, and the multifarious effects of climate change, which are influenced by the dual factors of global climate variability and energy scarcity. Concurrently, Reservoir Science is dedicated to the dissemination of innovative modules and research domains pertaining to energy extraction, energy storage, reservoir environment and greenhouse gas storage. Furthermore, the field of Reservoir Science encompasses the exploitation of geothermal energy, hydrocarbons (petroleum, hydrates) and hydrogen energy within reservoirs. The research scope of Reservoir Science encompasses not only the... More >