Petroleum Science最新文献

{"title":"A thermo-associating copolymer integrated with biogenic nanosilica as a novel viscosifier in low solid drilling fluids","authors":"Alain Pierre Tchameni ,&nbsp;Robert Dery Nagre ,&nbsp;Shu-Ming Yin ,&nbsp;Li-Qiang Wang ,&nbsp;Xiu-Ying Wang ,&nbsp;Si-Yuan Zhou ,&nbsp;Guan-Qun Hou ,&nbsp;Xu-Dong Wang","doi":"10.1016/j.petsci.2025.04.020","DOIUrl":"10.1016/j.petsci.2025.04.020","url":null,"abstract":"<div><div>Smart low-solid drilling fluids (SLSDFs) with thermo-controllable rheological properties and attractive thickening characteristics have recently captivated profound attention due to their low formation damage and enhanced cuttings lifting capacity. However, their applications to deep hole drilling at high temperatures have remained limited because of the thermal instability and environmental constraints of the thermo-associating polymers as additives. This work explored the synergistic benefits of thermo-associating polymer and biogenic nano-silica (B-SiNP) extracted from rice husk to improve the thermo-stability of SLSDF. This study shows that the nano-hybrid, TAP-S based on vinyl-terminated B-SiNP could potentially mitigate the limiting performance of conventional LSDF (F-2) caused by the failure of thermo-associating copolymers under elevated temperatures. TAP-S bearing drilling fluid (F-3) could preserve more than 5.6-fold of its initial properties (ca. apparent viscosity, plastic viscosity, yield point, and gel strength) with a nearly flat-gel profile in the temperature range of 25–230 °C, which was higher than those of the counterpart F-2 and base fluid according to the results of rheological tests analysis. In addition, TAP-S exhibited an abrupt thermo-thickening characteristic with a magnitude declining by only 1.05-fold and the activation Gibbs free energy of 1339 kJ/mol above the plateau (ca. 130 °C), reflecting its less sensitivity compared to F-2 under a continuous heating process. As a result, a lower temperature was required to drive the dehydration of the residual fraction of lower critical solution temperature (LCST) in nano-hybrid structures than TAP according to the results of DSC analysis. Thus, lower energy was expected to disintegrate the residual hydrogen bonds formed between the LCST chains and surrounding water molecules at elevated temperatures. Moreover, TAP-S formed a solid-micro-crosslinking structure network which exhibited a more stable hydrodynamic diameter as revealed by DLS analysis. Compared with TAP, TAP-S consisted of a larger composite B-SiNP-TAP integrated spatial network structure based on the results of environmental scanning electron microscope, which conferred a degree of thermal conductivity characteristic for improved temperature resistance. This contributed to the effective binding onto bentonite particles for protection and maintained a relatively stable bentonite particle dispersion according to the results of EPM and particle size distribution analyses. Consequently, TAP-S fortified drilling fluid demonstrates improved rheological and filtration performance under severe downhole conditions. Therefore, TAP-S, the thermo-associating copolymer integrated with B-SiNP could find potential application as an eco-friendly viscosifier in LSDFs for deep-well drilling operations.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Pages 2884-2904"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Experimental investigation on cross-layer propagation of hydraulic fractures in shale-sandstone interbedded reservoirs","authors":"Chao Liu ,&nbsp;Hai-Yan Zhu ,&nbsp;Kai Tang ,&nbsp;Peng Zhao ,&nbsp;Xuan-He Tang ,&nbsp;Lei Tao ,&nbsp;Zhao-Peng Zhang ,&nbsp;Guo-Hui Ren","doi":"10.1016/j.petsci.2025.04.018","DOIUrl":"10.1016/j.petsci.2025.04.018","url":null,"abstract":"<div><div>China's shale oil and gas resources are widely distributed in shale-sandstone interbedded reservoirs, whose complex lithology and strong heterogeneity pose significant challenges to hydraulic fracturing design. To address issues such as the difficulty in controlling fracture height and the challenge of forming an effective fracture network, this study utilizes synthetic rock samples that can represent the characteristics of interbedded reservoirs and investigates the initiation and propagation of hydraulic fractures under different viscosity, injection rate, and construction scheme. By combining real-time monitoring of injection pressure with acoustic emission, the temporal and spatial evolution characteristics of hydraulic fractures as well as the mechanisms of their vertical and horizontal extension are revealed. The results indicate that a higher fracturing fluid viscosity is essential for ensuring the vertical cross-layer propagation of hydraulic fractures, while a lower fluid viscosity facilitates the activation of weak interlayer surfaces, promoting sufficient horizontal propagation along these planes and forming branched fractures. Although a higher injection rate enhances the vertical cross-layer propagation of hydraulic fractures, it also causes greater diversion of the main fracture plane, resulting in simpler fracture morphology and limiting the stimulation effect. Additionally, an alternating injection of high and low viscosity fracturing fluids allows hydraulic fractures to both break through weak interlayer surfaces and achieve uniform horizontal propagation, resulting in a more complex fracture morphology. The findings are expected to provide a scientific basis and practical guidance for optimizing hydraulic fracturing designs in interbedded reservoir conditions.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Pages 2920-2936"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757542","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient numerical modeling scheme for solving fractional viscoacoustic wave equation in TTI media and its application in reverse time migration","authors":"Lei Xiang ,&nbsp;Jian-Ping Huang ,&nbsp;Qiang Mao ,&nbsp;Xin-Ru Mu ,&nbsp;Fei Li ,&nbsp;Juan Chen ,&nbsp;Jin-Tao Liu ,&nbsp;Min Xu","doi":"10.1016/j.petsci.2025.04.007","DOIUrl":"10.1016/j.petsci.2025.04.007","url":null,"abstract":"<div><div>Amplitude dissipation and phase dispersion occur when seismic waves propagate in attenuated anisotropic media, affecting the quality of migration imaging. To compensate and correct for these effects, the fractional Laplacian pure viscoacoustic wave equation capable of producing stable and noise-free wavefields has been proposed and implemented in the <em>Q</em>-compensated reverse time migration (RTM). In addition, the second-order Taylor series expansion is usually adopted in the hybrid finite-difference/pseudo-spectral (HFDPS) strategy to solve spatially variable fractional Laplacian. However, during forward modeling and <em>Q</em>-compensated RTM, this HFDPS strategy requires 11 and 17 fast Fourier transforms (FFTs) per time step, respectively, leading to computational inefficiency. To improve computational efficiency, we introduce two high-efficiency HFDPS numerical modeling strategies based on asymptotic approximation and algebraic methods. Through the two strategies, the number of FFTs decreased from 11 to 6 and 5 per time step during forward modeling, respectively. Numerical examples demonstrate that wavefields simulated using the new numerical modeling strategies are accurate and highly efficient. Finally, these strategies are employed for implementing high-efficiency and stable <em>Q</em>-compensated RTM techniques in tilted transversely isotropic media, reducing the number of FFTs from 17 to 9 and 8 per time step, respectively, significantly improving computational efficiency. Synthetic data examples illustrate the effectiveness of the proposed <em>Q</em>-compensated RTM scheme in compensating amplitude dissipation and correcting phase distortion.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Pages 2794-2817"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"OFC","authors":"","doi":"10.1016/S1995-8226(25)00245-6","DOIUrl":"10.1016/S1995-8226(25)00245-6","url":null,"abstract":"","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Page OFC"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144780023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Establishing a fault sealing discrimination method to determine the optimal injection sites and injection rate for CO2 storage in complex fault-block geological bodies","authors":"Zi-Yang Song ,&nbsp;Lei-Lei Yang ,&nbsp;Yi Liu ,&nbsp;Fu-Jie Jiang ,&nbsp;Xiao-Feng Li ,&nbsp;Zhen-Guo Qi ,&nbsp;Zhen-Yuan Yin","doi":"10.1016/j.petsci.2025.03.018","DOIUrl":"10.1016/j.petsci.2025.03.018","url":null,"abstract":"<div><div>The long-term stability of CO₂ storage represents a pivotal challenge in geological CO₂ storage (CGS), particularly within deep saline aquifers characterized by complex fault-block systems. While the injection sites and rate under different fault structures will directly affect the CO₂ storage effect and the risk of leakage. This study investigates the Gaoyou Sag in the Subei Basin, a representative fault-block reservoir, through an integrated numerical-experimental approach. A three-dimensional simulation model incorporating multiphase flow dynamics was developed to characterize subsurface CO₂ transport and dissolution processes. A novel fault seal capacity evaluation framework was proposed, integrating three critical geological indices (fault throw/reservoir thickness/caprock thicknesses) with the coupling of formation physical properties, temperature, and pressure for the rational selection of injection sites and rates. The results show that Optimal storage performance is observed when the fault throw is lower than the reservoir and caprock thicknesses. Furthermore, higher temperature and pressure promote the dissolution and diffusion of CO₂, while compared to the structural form of faults, the physical properties of faults have a more significant effect on CO₂ leakage. The larger reservoir space and the presence of an interlayer reduce the risk of CO₂ leakage, and augmenting storage potential. Decreasing the injection rate increases the proportion of dissolved CO₂, thereby enhancing the safety of CO₂ storage.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Pages 2643-2659"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144757586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Regulating carbonaceous mesophase structure by controlling nitrogen-containing aromatics of FCC slurry oil: Insights from MD simulations and experimental studies","authors":"Xing-Guo Wei ,&nbsp;Yuan-Qin Zhang ,&nbsp;Ling-Rui Cui,&nbsp;Cao Liu,&nbsp;Jian Huang,&nbsp;Fa-Hai Cao","doi":"10.1016/j.petsci.2025.03.031","DOIUrl":"10.1016/j.petsci.2025.03.031","url":null,"abstract":"<div><div>The influence of nitrogen-containing polycyclic aromatic hydrocarbons (NC-PAH) on the formation of carbonaceous mesophase remains enigmatic, despite extensive research on the production of carbonaceous materials from aromatic-rich oils. Molecular dynamics simulation was used to investigate the variations in pyrolysis behavior between PAH and NC-PAH based on the composition analysis. Through adjusting the content of NC-PAH, the influence of NC-PAH on the thermal stability of slurry oils (SOs) was evaluated by thermogravimetry, viscosity, coke value, and quinoline insoluble (QI). The morphology and structure of mesocarbon microbeads (MCMBs) prepared with SOs were measured by a polarized-light microscope, SEM, XRD, and Raman. Simulation results indicate that NC-PAH possesses much higher reactivity and tends to produce highly condensed solid and coke products. It corresponds to the QI and high viscosity in thermal stability experiments. Therefore, high concentrations of NC-PAH result in nonuniform morphology and disordered structures. In a system with low viscosity and few QIs, SO, which has a low nitrogen content (475 ppm), reacts gently to produce MCMBs with a uniform particle size (10–40 μm) and an excellent spherical shape. As NC-PAH content decreases, the crystalline size of graphitization elevates, as evidenced by parallel layers (10.472–11.764) and stack height (3.269–3.701 nm). The graphitization degree becomes worse and nonuniform with the increase of the content of NC-PAH, and the best is 20.58% evaluated by Raman spectra area ratio (<em>A</em>_G/<em>A</em>_all). Overall, this work suggests a nitrogen content reference and a controlling technology of nitrogen for the preparation of superior MCMB.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 7","pages":"Pages 3015-3028"},"PeriodicalIF":6.1,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144758086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evolution of the 3D pore structure of organic-rich shale with temperature based on micro-nano CT","authors":"Chao-Fan Zhu ,&nbsp;Tian-Le Zhang ,&nbsp;Jun-Fan Pan ,&nbsp;Yan-Wei Li ,&nbsp;James J. Sheng ,&nbsp;Dong Ge ,&nbsp;Rui Jia ,&nbsp;Wei Guo","doi":"10.1016/j.petsci.2025.03.037","DOIUrl":"10.1016/j.petsci.2025.03.037","url":null,"abstract":"<div><div>Organic-rich shale is a significant potential source of oil and gas that requires development through in situ conversion technology. However, the evolution patterns of the internal three-dimensional (3D) pore structure and kerogen distribution at high temperatures are not well understood, making it difficult to microscopically explain the evolution of the flow conductivity in organic-rich shale at high temperatures. This study utilizes high-resolution X-ray computed tomography (micro-nano CT) to obtain the distribution of pores, kerogen, and inorganic matter at different temperatures. Combined with the pyrolysis results for the rock, the evolution of the pore structure at various temperatures is quantitatively analyzed. Based on three-phase segmentation technology, a model of kerogen distribution in organic-rich shale is established by dividing the kerogen into clustered kerogen and dispersed kerogen stored in the inorganic matter and the pores into inorganic pores and organic pores within the kerogen skeleton.</div><div>The results show that the inorganic pores in organic-rich shale evolve through three stages as the temperature increases: kerogen pyrolysis (200–400 °C), clay mineral decomposition (400–600 °C), and carbonate mineral decomposition (600–800 °C). The inorganic pores porosity sequentially increases from 3% to 11.4%, 13.1%, and 15.4%, and the roughness and connectivity of the inorganic pores gradually increase during this process. When the pyrolysis temperature reaches 400 °C, the volume of clustered kerogen decreases from 25% to 12.5%. During this process, the relative density of kerogen decreases from 9.5 g/cm³ in its original state to 5.4 g/cm³, while the kerogen skeleton density increases from 1.15 g/cm³ in its original state to 1.54 g/cm³. Correspondingly, 7%–8% of organic pores develop within the clustered kerogen, accounting for approximately 50% of the volume of clustered kerogen. In addition, approximately 30% of the kerogen in organic-rich shale exists in the form of dispersed kerogen within inorganic matter, and its variation trend is similar to that of clustered kerogen, rapidly decreasing from 200 to 400 °C and stabilizing above 400 °C. The results of this study provide an essential microscopic theoretical basis for the industrial development of organic-rich shale resources.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 6","pages":"Pages 2339-2352"},"PeriodicalIF":6.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffraction classification imaging using coordinate attention enhanced DenseNet","authors":"Tong-Jie Sheng ,&nbsp;Jing-Tao Zhao ,&nbsp;Su-Ping Peng ,&nbsp;Zong-Nan Chen ,&nbsp;Jie Yang","doi":"10.1016/j.petsci.2025.03.039","DOIUrl":"10.1016/j.petsci.2025.03.039","url":null,"abstract":"<div><div>In oil and gas exploration, small-scale karst cavities and faults are important targets. The former often serve as reservoir space for carbonate reservoirs, while the latter often provide migration pathways for oil and gas. Due to these differences, the classification and identification of karst cavities and faults are of great significance for reservoir development. Traditional seismic attributes and diffraction imaging techniques can effectively identify discontinuities in seismic images, but these techniques do not distinguish whether these discontinuities are karst cavities, faults, or other structures. It poses a challenge for seismic interpretation to accurately locate and classify karst cavities or faults within the seismic attribute maps and diffraction imaging profiles. In seismic data, the scattering waves are associated with small-scale scatters like karst cavities, while diffracted waves are seismic responses from discontinuous structures such as faults, reflector edges and fractures. In order to achieve classification and identification of small-scale karst cavities and faults in seismic images, we propose a diffraction classification imaging method which classifies diffracted and scattered waves in the azimuth-dip angle image matrix using a modified DenseNet. We introduce a coordinate attention module into DenseNet, enabling more precise extraction of dynamic and azimuthal features of diffracted and scattered waves in the azimuth-dip angle image matrix. Leveraging these extracted features, the modified DenseNet can produce reliable probabilities for diffracted/scattered waves, achieving high-accuracy automatic classification of cavities and faults based on diffraction imaging. The proposed method achieves 96% classification accuracy on the synthetic dataset. The field data experiment demonstrates that the proposed method can accurately classify small-scale faults and scatterers, further enhancing the resolution of diffraction imaging in complex geologic structures, and contributing to the localization of karstic fracture-cavern reservoirs.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 6","pages":"Pages 2353-2383"},"PeriodicalIF":6.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A dual-scale failure evaluation method for Carbon-glass hybrid Fiber sucker rod and their joints under complex loads","authors":"Xiao-Xiao Lv ,&nbsp;Wen-Rui Jin ,&nbsp;Xin Zhang","doi":"10.1016/j.petsci.2025.04.019","DOIUrl":"10.1016/j.petsci.2025.04.019","url":null,"abstract":"<div><div>A hybrid fiber-reinforced polymer (HFRP) continuous sucker rod, comprising a carbon fiber-reinforced polymer (CFRP) core layer, a glass fiber-reinforced polymer (GFRP) winding layer, and a GFRP coating layer (CFRP:GFRP = 2:3), has been developed and widely used in oilfield extraction due to its lower specific gravity, enhanced corrosion resistance, and superior strength. However, HFRP rod joints and their adjacent sections are prone to multi-mode failures, including fracture, debonding, and cracking. Due to the complexity of joint structure and the coupling of tension, bending, and torsion, the failure mechanism is unclear. To address this issue, a dual-scale failure assessment methodology for HFRP rods was proposed, utilizing both macro and meso finite element models (FEM). This methodology was validated through tensile and bending experiments, which yielded critical loads for the φ22 mm HFRP rod: a tensile load of 340.2 kN, a torque of 132.3 N m, and a bending moment of 1192.4 N m. Additionally, a comprehensive FEM of the joint was established, which identified potential failure points at the necking of the rotary joint, resin adhesive and the HFRP rod cross-section at the first groove tip. These failure modes closely matched the experimental observations. Furthermore, the simulation results show that stress concentration at the joint reduced the tensile, bending, and torsional strengths of the HFRP rod to 61%, 12%, and 82% of their original values, respectively. The effects of bending moments and torque on the tensile strength of HFRP rods were subsequently explored, leading to the development of an equivalent fatigue assessment method for HFRP rod joints. This method, based on the fatigue characteristics of HFRP rods and joint components, reveals that the primary cause of joint failure is the susceptibility of both the joint and the HFRP rod to bending moments and torque induced by dynamic buckling of the sucker rod string (SRS). Using this method, the fatigue ultimate axial force of the φ22 mm HFRP joint was determined to be 91.5 kN, with corresponding fatigue ultimate torque and bending moment under an axial force of 62.4 kN being 89.3 N m and 71.5 N m, respectively. Finally, a design method incorporating a concentrated weighting strategy for HFRP-steel mixed rods was proposed to enhance their service life, and its effectiveness was demonstrated through on-site testing.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 6","pages":"Pages 2570-2591"},"PeriodicalIF":6.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572904","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ temperature-pressure preserved coring for onshore deep oil and gas exploration: research on the design principles and mechanical properties of the temperature-preserved core chamber","authors":"Yi-Wei Zhang ,&nbsp;Jia-Nan Li ,&nbsp;Zhi-Qiang He ,&nbsp;Ling Chen ,&nbsp;Cong Li ,&nbsp;Da Guo ,&nbsp;Ding-Ming Wang ,&nbsp;Xin Fang ,&nbsp;He-Ping Xie","doi":"10.1016/j.petsci.2025.04.011","DOIUrl":"10.1016/j.petsci.2025.04.011","url":null,"abstract":"<div><div>A novel temperature-preserved core chamber designed for depths exceeding 5000 m has been developed to enhance the scientific understanding of deep oil and gas reservoirs. This temperature-preserved core chamber employs an innovative vacuum layer for temperature preservation and is compatible with a temperature-pressure preserved coring system. The design principles and key parameters of the temperature-preserved core chamber were determined through static analysis. Numerical simulations assessed the mechanical properties of 70, 85, and 100 MPa core chambers under conditions of 120–150 °C. The results demonstrate that the temperature-preserved core chambers withstand the applied stresses without plastic deformation, and the vacuum layer maintains its integrity under these conditions. A 70 MPa class core chamber prototype was manufactured, and system integration tests were performed on a self-developed in-situ coring platform. The system demonstrated stable operation at 70 MPa for 120 min, with pressure fluctuations within 5%. Additionally, the integrated system operated without interference, enabling the successful extraction of cores with a 50 mm diameter. These findings provide valuable theoretical guidance and design recommendations for advancing oil and gas in-situ temperature-pressure preserved coring technologies in high-temperature and high-pressure environments.</div></div>","PeriodicalId":19938,"journal":{"name":"Petroleum Science","volume":"22 6","pages":"Pages 2438-2456"},"PeriodicalIF":6.0,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}