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石油科学（英文版）
石油科学（英文版）

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北京市学院路20号石油大院15楼317室

石油科学（英文版）/Journal Petroleum ScienceCSCD北大核心SCI
查看更多>>本刊办刊宗旨在于向国外介绍中国石油界最新的学术、科研成果，广泛开展国际间的学术交流，促进中国石油科学技术的发展。主要刊登反映中国石油石油科学技术领域最新、最高水平科研成果的科技论文。其专业内容包括石油勘探与开发、石油储运工程、石油炼制与化工、石油机电工程、油田化工、石油工业经济管理与营销以及与石油工业有关的各个学科。
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    Heat front propagation in shale oil reservoirs during air injection:Experimental and numerical studies

    Shuai ZhaoChun-Yun XuWan-Fen PuQing-Yuan Chen...
    3379-3389页
    查看更多>>摘要：Air injection technique for developing shale oil has gained significant attention.However,the ability of the heat front to consistently propagate within the shale during air injection remains uncertain.To address this,we investigated the heat front propagation within oil-detritus mixtures,shale cores,and fractured shale cores using a self-designed combustion tube(CT)and experimental schemes.By inte-grating the results obtained from high-pressure differential scanning calorimetry and CT,we developed a comprehensive reaction kinetics model to accurately analyze the main factors influencing the heat front propagation within fractured shale.The findings revealed that in the absence of additional fractures,the heat front failed to propagate within the tight shale.The flow of gases and liquids towards the shale core was impeded,resulting in the formation of a high-pressure zone at the front region of the shale.This pressure buildup significantly hindered air injection,leading to inadequate oxygen supply and the extinguishment of the heat front.However,the study demonstrated the stable propagation of the heat front within the oil-detritus mixtures,indicating the good combustion activity of the shale oil.Furthermore,the heat front successfully propagated within the fractured shale,generating a substantial amount of heat that facilitated the creation of fractures and enhanced gas injection and shale oil flow.It was important to note that after the heat front passed through the shale,the combustion intensity decreased.The simulation results indicated that injecting air into the main fracturing layers of the shale oil reservoir enabled the establishment of a stable heat front.Increasing the reservoir temperature(from 63 to 143 ℃)and oxygen concentration in the injected gas(from 11％to 21％)promoted notable heat front propagation and increased the average temperature of the heat front.It was concluded that temperature and oxygen concentration had the most important influence on the heat front propagation,followed by pressure and oil saturation.
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    Synthesis of temperature and salt resistance silicon dots for effective enhanced oil recovery in tight reservoir

    Cheng LiuBiao ZhouBing-Shan WangHuan Wang...
    3390-3400页
    查看更多>>摘要：The intensive development of tight reservoirs has positioned them as a strategic alternative to con-ventional oil and gas resources.Existing enhanced oil recovery(EOR)methods struggle to effectively exploring reservoir oil,resulting in low recovery rates.Novel and effective means of developing tight reservoirs are urgently needed.Nanomaterials have shown promising applications in improving water flooding efficiency,with in-depth research into mechanisms that lower injection pressure and increase water injection volumes.However,the extent of improvement remains limited.In this study,a silicon quantum dots(Si-QDs)material was synthesized via a hydrothermal synthesis method and used to prepare a nanofluid for the efficient recovery of tight reservoir.The Si-QDs,with an approximate diameter of 3 nm and a spherical structure,were surface functionalized with benzenesulfonic acid groups to enhance the performance.The developed nanofluid demonstrated stability without aggrega-tion at 120 ℃ and a salinity of 60000 mg/L.Core flooding experiments have demonstrated the attractive EOR capabilities of Si-QDs,shedding light of the EOR mechanisms.Si-QDs effectively improve the wettability of rocks,enhancing the sweeping coefficient of injected fluids and expanding sweeping area.Within this sweeping region,Si-QDs efficiently stripping adsorbed oil from the matrix,thus increasing sweeping efficiency.Furthermore,Si-QDs could modify the state of pore-confined crude oil,breaking it down into smaller particles that are easier to displacement in subsequent stages.Si-QDs exhibit compelling EOR potential,positioning them as a promising approach for effectively developing tight oil reservoirs.
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    Influence of glycol ether additive with low molecular weight on the interactions between CO2 and oil:Applications for enhanced shale oil recovery

    Huan ZhangHou-Jian GongWei LvJi-Wei Lv...
    3401-3416页
    查看更多>>摘要：The high-efficient development of shale oil is one of the urgent problems in the petroleum industry.The technology of CO2 enhanced oil recovery(EOR)has shown significant effects in developing shale oil.The effects of several glycol ether additives with low molecular weight on the interactions between CO2 and oil were investigated here.The solubility of glycol ether additive in CO2 was firstly characterized.Then,the effects of glycol ether additives on the interfacial tension(IFT)between CO2 and hexadecane and the volume expansion and extraction performance between CO2 and hexadecane under different pressures was investigated.The experimental results show that diethylene glycol dimethyl ether(DEG),triethylene glycol dimethyl ether(TEG),and tetraethylene glycol dimethyl ether(TTEG)all have low cloud point pressure and high affinity with CO2.Under the same mass fraction,DGE has the best effect to reduce the IFT between hexadecane and CO2 by more than 30.0％,while an overall reduction of 20.0％-30.0％for TEG and 10.0％-20.0％for TTEG.A new method to measure the extraction and expansion rates has been established and can calculate the swelling factor accurately.After adding 1.0％DEG,the expansion and extraction amounts of CO2 for hexadecane are respectively increased to 1.75 times and 2.25 times.The results show that glycol ether additives assisted CO2 have potential application for EOR.This study can provide theoretical guidance for the optimization of CO2 composite systems for oil displacement.
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    Ethoxylated molybdenum disulphide based nanofluid for enhanced oil recovery

    Infant RajZhuo LuJi-Rui HouYu-Chen Wen...
    3417-3427页
    查看更多>>摘要：Despite advances in renewable energy sources,the world's current infrastructure and consumption patterns still heavily depend on crude oil.Enhanced oil recovery(EOR)is a crucial method for signifi-cantly increasing the amount of crude oil extracted from mature and declining oil fields.Nanomaterials have shown great potential in improving EOR methods due to their unique properties,such as high surface area,tunable surface chemistry,and the ability to interact at the molecular level with fluids and rock surfaces.This study examines the potential use of incorporating ethoxylated molybdenum disulfide with a unique three-dimensional flower-like morphology for overcoming the challenges associated with oil recovery from reservoirs characterized by complex pore structures and low permeability.The syn-thesized nanomaterial features a chemical composition that encompasses a polar ethoxy group linking molybdenum disulfide nanosheets and an alkylamine chain.The ethoxy group promotes interactions with water molecules through hydrogen bonding and electrostatic forces,disrupting the cohesive forces among water molecules and reduction surface tension at the oil-water interface.As a result,the nanomaterial achieves an ultra-low interfacial tension of 10-3 mN/m.Core flooding experiments demonstrate a significant oil recovery of approximately 70％at a concentration as low as 50 ppm.This research paves the way for the design and synthesis of advanced extended surfactant-like nanomaterials,offering a promising avenue for enhancing oil recovery efficiency.
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    Failure evaluation mechanism of cement sheath sealing integrity under casing eccentricity during multistage fracturing

    Yan XiYu YaoXue-Li GuoJun Li...
    3428-3445页
    查看更多>>摘要：A microannulus(MA)is the primary reason for sustained casing pressure in multi-stage fractured-shale gas wells.However,the effect of the casing eccentricity on the long horizontal section has not been considered.In this study,a full-scale integrity tester for cement sheaths is adopted to measure the cu-mulative plastic deformation.Numerical models are applied to evaluate the development of the cu-mulative plastic deformation and quantify the MA width considering casing centralization and eccentricity in the context of multiple loading and unloading cycles.Subsequently,the influences of the eccentricity distance and angle,cement-sheath mechanical variables,and different well depths on the cumulative sheath plastic deformation and sheath MA development are explored.The research results demonstrate that casing eccentricity significantly increases the cumulative sheath plastic deformation compared with that of the casing-centered condition.Consequently,the risk of sealing integrity failure increases.The accumulated plastic deformation increases when the eccentricity distance increases.In contrast,the initial plastic deformation increases as the eccentricity angle increases.However,the cu-mulative plastic deformation decreases after a specific loading and unloading cycle count.Affected by the coupled influence of the internal casing pressure and fracturing stages,the width of the MA in the horizontal section increased from the toe to the heel,and the casing eccentricity significantly increased the MA width at each stage,thus increasing the risk of gas channeling.Finally,an engineering case is considered to study the influence of casing eccentricity.The results show that cement slurries that form low and high elastic moduli can be applied to form a cement sheath when the fracturing stage is lower or higher than a specific value,respectively.The results of this study offer theoretical references and en-gineering support for the integrity control of cement sheath sealing.
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    Curing kinetics and plugging mechanism of high strength curable resin plugging material

    Jing-Bin YangYing-Rui BaiJin-Sheng SunKai-He Lv...
    3446-3463页
    查看更多>>摘要：Lost circulation,a recurring peril during drilling operations,entails substantial loss of drilling fluid and dire consequences upon its infiltration into the formation.As drilling depth escalates,the formation temperature and pressure intensify,imposing exacting demands on plug materials.In this study,a kind of controllable curing resin with dense cross-network structure was prepared by the method of solution stepwise ring-opening polymerization.The resin plugging material investigated in this study is a continuous phase material that offers effortless injection,robust filling capabilities,exceptional reten-tion,and underground curing or crosslinking with high strength.Its versatility is not constrained by fracture-cavity lose channels,making it suitable for fulfilling the essential needs of various fracture-cavity combinations when plugging fracture-cavity carbonate rocks.Notably,the curing duration can be fine-tuned within the span of 3-7 h,catering to the plugging of drilling fluid losing of diverse fracture dimensions.Experimental scrutiny encompassed the rheological properties and curing behavior of the resin plugging system,unraveling the intricacies of the curing process and establishing a cogent kinetic model.The experimental results show that the urea-formaldehyde resin plugging material has a tight chain or network structure.When the concentration of the urea-formaldehyde resin plugging system solution remains below 30％,the viscosity clocks in at a meager 10 mPa s.Optimum curing transpires at 60 ℃,showcasing impressive resilience to saline conditions.Remarkably,when immersed in a composite saltwater environment containing 50000 mg/L NaCl and 100000 mg/L CaCl2,the urea-formaldehyde resin consolidates into an even more compact network structure,culminating in an outstanding compressive strength of 41.5 MPa.Through resolving the correlation between conversion and the apparent activation energy of the non-isothermal DSC curing reaction parameters,the study attests to the fulfillment of the kinetic equation for the urea-formaldehyde resin plugging system.This discerning analysis illuminates the nuanced shifts in the microscopic reaction mechanism of the urea-formaldehyde resin plugging system.Furthermore,the pressure bearing plugging capacity of the resin plugging system for fractures of different sizes is also studied.It is found that the resin plugging system can effectively resident in parallel and wedge-shaped fractures of different sizes,and form high-strength consolidation under certain temperature conditions.The maximum plugging pressure of resin plugging system for parallel fractures with outlet size 3 mm can reach 9.92 MPa,and the maximum plugging pressure for wedge-shaped fractures with outlet size 5 mm can reach 9.90 MPa.Consequently,the exploration and application of urea-formaldehyde resin plugging material precipitate a paradigm shift,proffering novel concepts and methodologies in resolving the practical quandaries afflicting drilling fluid plugging.
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    Magnetically controlled self-sealing pressure-preserved coring technology

    Gui-Kang LiuHe-Ping XieCong LiZhen-Xi You...
    3464-3481页
    查看更多>>摘要：Pressure-preserved coring is an effective means to develop deep resources.However,due to the complexity of existing pressure-preserved technology,the average success rate of pressure-preserved coring is low.In response,a novel in situ magnetically controlled self-sealing pressure-preserved cor-ing technology for deep reserves has been proposed and validated.This innovative technology distin-guishes itself from conventional methods by employing noncontact forces to replace traditional pre-tensioning mechanisms,thereby enhancing the mechanical design of pressure-preserved coring equip-ment and significantly boosting the fault tolerance of the technology.Here,we report on the design,theoretical calculations,experimental validation,and industrial testing of this technology.Through theoretical and simulation calculations,the self-sealing composite magnetic field of the pressure controller was optimized.The initial pre-tensioning force of the optimal magnetic field was 13.05 N.The reliability of the magnetically controlled self-sealing pressure-preserved coring technology was verified using a self-developed self-sealing pressure performance testing platform,confirming the accuracy of the composite magnetic field calculation theory.Subsequently,a magnetically controlled self-triggering pressure-preserved coring device was designed.Field pressure-preserved coring was then conducted,preliminarily verifying the technology's effective self-sealing performance in industrial applications.Furthermore,the technology was analyzed and verified to be adaptable to complex reservoir environ-ments with pressures up to 30 MPa,temperatures up to 80 ℃,and pH values ranging from 1 to 14.These research results provide technical support for multidirectional pressure-preserved coring,thus paving a new technical route for deep energy exploration through coring.
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    Dynamic simulation of double-cased perforation in deepwater high temperature and high-pressure oil and gas wells

    Gang BiFei HanJie-Min WuPei-Jie Yuan...
    3482-3495页
    查看更多>>摘要：In order to ensure the penetrability of double-cased perforation in offshore oil and gas fields and to maximize the capacity of perforation completion,This study establishes a dynamic model of double-cased perforation using ANSYS/LS-DYNA simulation technology.The combination of critical perforation parameters for double casing is obtained by studying the influencing factors of the jet-forming process,perforation depth,diameter,and stress changes of the inner and outer casing.The single-target perfo-ration experiments under high-temperature and high-pressure(HTHP)conditions and ground full-scale ring target perforation tests are designed to verify the accuracy of numerical simulation results.The reduced factor is adopted as the quantitative measure of perforation depth and diameter for different types of perforation charge under different conditions.The results show that the perforation depth reduction increases with temperature and pressure,and the reduced factor is between 0.67 and 0.87 under HTHP conditions of 130 ℃/44 MPa and 137 ℃/60 MPa.Comparing the results of the numerical simulation and the full-scale test correction,the maximum error is less than 8.91％,and this numerical simulation has strong reliability.This research provides a basis for a reasonable range of double-cased perforation parameters and their optimal selection.
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    A systematic review of machine learning modeling processes and applications in ROP prediction in the past decade

    Qian LiJun-Ping LiLan-Lan Xie
    3496-3516页
    查看更多>>摘要：Fossil fuels are undoubtedly important,and drilling technology plays an important role in realizing fossil fuel exploration;therefore,the prediction and evaluation of drilling efficiency is a key research goal in the industry.Limited by the unknown geological environment and complex operating procedures,the prediction and evaluation of drilling efficiency were very difficult before the introduction of machine learning algorithms.This review statistically analyses rate of penetration(ROP)prediction models established based on machine learning algorithms;establishes an overall framework including data collection,data preprocessing,model establishment,and accuracy evaluation;and compares the effec-tiveness of different algorithms in each link of the process.This review also compares the prediction accuracy of different machine learning models and traditional models commonly used in this field and demonstrates that machine learning models are the most effective technical means in current ROP prediction modeling.
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    Optimal depth of in-situ pressure-preserved coring in coal seams considering roadway excavation and drilling disturbance

    Peng-Fei CuiDe-Lei ShangPeng ChuJu Li...
    3517-3534页
    查看更多>>摘要：Using pressure-preserved coring technique to determine in-situ gas content provides a more precise assessment of gas resource reserves and safeguard of mining safety in coal seams.How coring technique and depth affect the determination of gas content is unclear due to borehole zoning rupture caused by roadway excavation and drilling disturbance.To this end,a proposed coupling model of stress distri-bution and gas migration was simulated and validated by FLAC3D and COMSOL Multiphysics considering superposition effects of roadway excavation and drilling disturbance.The findings indicate that the roadway surrounding rock displays distinct zoning features including stress relief zone,stress concen-tration zone that is composed of plastic zone,elastic zone,and original stress zone;and the broken situations depending on the borehole peeping are consistent with the corresponding simulation results.On this basis,this study proposes a set of drilling coring depth calculation and prediction model for the gas desorption affected area under engineering disturbance.Optimal depth of coring drilling is not only approach to the in-situ coal bulk,but also can get the balance of the drilling workload and cost con-trolling.According to the typical mine site geological conditions and the numerical simulation results in this study,if the roadway excavation time is-1 year,it is recommended that the pressure-preserved coring depth should be greater than 17 m.
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