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2025 SPE/IAdC International drilling Conference and Exhibition, dC 2025

作者： Mahjoub, M. Nguyen, K.-L. dao, N.-H. Menand, S. Endres, L. Cheng, C. Mada, H. Feng, X. Sun, J. Helmerich & Payne Villeurbanne France Helmerich & Payne HoustonTX United States CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Ltd. Beijing China

ISBN: (纸本)9781959025641

Studies indicate that the interaction between the drill bit and rock formations induces vibrations along the bottom hole assembly (BHA). Parameters such as weight on bit (WOB) and rotation speed affect the engagement of the cutters in the rock, otherwise known as depth of cut (dOC). dOC is crucial for bit stability;a poor BHA design combined with a suboptimal choice of dOC can lead to axial, torsional, and lateral instabilities (bit bounce, stick-slip, and bit whirling phenomena). Optimizing the bit design to address these vibrations is vital for improved drilling performance. Both experimental studies in the lab and numerical simulations are essential tools to test and improve bit design before real-world drilling. In this work, a transient bit-rock interaction model is implemented to study the evolution of cutting and friction forces on each individual cutter, whether it is a cylindrical or shaped cutter. Specific models are introduced based on laboratory scratch tests, where the performance of each shaped cutter type is related to its main geometrical characteristics. These elementary forces are combined to provide the overall response of the bit. It accounts for axial, torsional, and lateral motions of the bit as well as the possible transition between different rock layers that generally trigger bit instability. This model is coupled with a time-domain dynamics model of the drill string to examine the implications of the cutting process on the BHA vibration. Experimental lab data on a drill bit are used as a basis to calibrate the model. The experimental measurements are then complemented with the simulation results to have an in-depth understanding of the bit behavior. Comparisons of lab and simulation results showed a good agreement for WOB, torque on bit (TOB), and lateral acceleration. Based on these results, the numerical simulations allowed investigation of the cutter elementary forces, ranking them in terms of work rate and durability. Moreover, the simu

关键词： Stick-slip

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Automatic detection and classification of drill bit damage using deep learning and computer vision algorithms

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Natural Gas Industry B 2025年第2期12卷 195-206页

作者： Yang, Xiongwen Feng, Xiao Cheng, Chris Yu, Jiaqing Zhang, Qing Gao, Zilong Liu, Yang Chen, Bo CNPC Houston Technology Research Center Beijing 100028 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China National Engineering Research Center of Oil & Gas Drilling and Completion Technology Beijing 102206 China DataNova Analytics Incorporated Houston 77084 TX United States

This study aims to eliminate the subjectivity and inconsistency inherent in the traditional International Association of drilling Contractors (IAdC) bit wear rating process, which heavily depends on the experience of drilling engineers and often leads to unreliable results. Leveraging advancements in computer vision and deep learning algorithms, this research proposes an automated detection and classification method for polycrystalline diamond compact (PdC) bit damage. YOLOv10 was employed to locate the PdC bit cutters, followed by two SqueezeNet models to perform wear rating and wear type classifications. A comprehensive dataset was created based on the IAdC dull bit evaluation standards. Additionally, this study discusses the necessity of data augmentation and finds that certain methods, such as cropping, splicing, and mixing, may reduce the accuracy of cutter detection. The experimental results demonstrate that the proposed method significantly enhances the accuracy of bit damage detection and classification while also providing substantial improvements in processing speed and computational efficiency, offering a valuable tool for optimizing drilling operations and reducing costs. © 2025 Sichuan Petroleum Administration

关键词： Artificial intelligence damage assessment data augmentation deep learning IAdC dull PdC bit

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Insights into the carbonate/bicarbonate ion-induced failure mechanism of bentonite in drilling fluids

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Journal of Molecular Liquids 2025年 417卷

作者： deng, Xuefei Lv, Kaihe Qiao, Huotong Li, Jian Sun, Jinsheng Huang, Ning Fan, Junhao Liao, Ting Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102200 China Engineering Technology Department of CNPC Chuanqing Drilling Engineering Co. Ltd. Chengdu610000 China

during deep oil and gas drilling, drilling fluids are often polluted with carbon dioxide (CO2). The intrusion of CO2 can affect bentonite performance, leading to deterioration or even failure of drilling fluids. To further investigate the influence of CO2 pollution on the bentonite and its failure mechanism, Na2CO3 simulation experiments were conducted. Performance evaluation showed that as the concentration of HCO3− and CO32− increased, the viscosity, filtration loss, and mud cake permeability of drilling fluids significantly increased. Meanwhile, the drilling fluid foaming was particularly evident. Mechanism studies indicated that the adsorption of HCO3− and CO32− on the bentonite diminished the electrostatic interactions and interlayer spacing between particles, leading to the particles aggregation and a decrease in Zeta potential, ultimately causing the hydration film on the bentonite to become thinner. Simultaneously, this also led to a decline in the dispersibility of bentonite. This study can offer a new research thread for the failure mechanism of bentonite under CO2 pollution and indicate the direction for the study of drilling fluid resistance to acidic gas pollution. © 2024 Elsevier B.V.

关键词： drilling fluids

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research on the Calculation Method of CO2 Storage Volume and its Application in L reservoir

Research on the Calculation Method of CO2 Storage Volume and...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Wu, Zangyuan Feng, Qihong Lian, Liming Meng, Xiangjuan Xu, YanLong Wang, Sen Wu, Kuankuan Zhou, Wei Luo, Min Li, Yang Fan, Jin Cheng, ronghong Wu, Mimi Huang, Xingning School of Petroleum Engineering China University of Petroleum East China China Tarim Oilfield Company PetroChina Korla China R&D Center for Ultra-Deep Complex Reservoir Exploration and Development CNPC Korla China Research Institute of Petroleum E&D Petrochina CNPC Beijing China Chengdu CK Energy Technology Co. Ltd. Chengdu China

ISBN: (纸本)9781959025436

This paper addresses the difficulty in calculating CO2 storage volume due to the complexity of CO2 occurrence states in the CCUS process. A method for calculating CO2 storage volume is proposed, designing well networks throughout the entire lifecycle of CCUS to meet the demands of both CO2 EOr and storage stages. This extends the implementation time of CO2 EOr to enhance oil recovery and ensures effective CO2 storage while maximizing oil production, aligning with the global strategy of green and low-carbon development. Initially assuming that the pore volume of produced hydrocarbons is completely occupied by CO2 and considering dissolution retention and mineral reaction retention, the theoretical carbon storage volume of the target reservoir is predicted to determine the upper limit of storage volume. Building on flash calculation, utilizing equations of state-activity models, equations of state-equations of state models, and chemical reaction kinetics models, model parameters were fitted and corrected through experiments on CO2 multiphase non-isothermal flow, dissolution, solid-phase deposition, and mineral reactions to develop a CO2 storage volume prediction model and proprietary software. Finally, reliability verification was conducted using analogous block comparison methods. The technology proposed in this paper has been applied in the integrated CO2 EOr and storage scheme for the L reservoir, predicting saturation fields, solubility fields, and various storage mechanisms during the CO2 flooding and storage process and providing three-dimensional field changes. results indicate that the theoretical carbon storage upper limit for the L reservoir is 9.88 million tons;under current reservoir temperature and pressure conditions, CO2 dissolution loss in formation connate water is 0.05 t/m3, and in residual oil it is 0.32 t/t, resulting in an effective storage volume of 7.47 million tons (with analogous block comparison results at 7.78 million tons, verifying the rel

关键词： Oil well flooding

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Overcoming complex near-surface conditions for improved seismic imaging in Tarim Basin, China

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Leading Edge 2025年第3期44卷 206-213页

作者： Zhao, ruirui Zheng, duoming Yang, Shanshan Zuo, Anxin Chen, Yangyang Zhu, Xianhuai Xu, Ken Gray, Sam PetroChina Tarim Oilfield Company Research Institute of Exploration and Development Xinjiang Korla China CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development Xinjiang Korla China Engineering Research Center for Ultra-Deep Complex Reservoir Exploration and Development Xinjiang China Forland Geophysical Services HoustonTX United States Viridien CalgaryAB Canada

Seismic imaging in the Tarim Basin, China, presents significant challenges due to complex near-surface conditions, including desert environments, foothills, and loess mountains. These challenges are comparable to those found in regions such as the Arabian Peninsula, North Africa, the Andes Mountains, and other complex terrains worldwide. recent advancements in seismic imaging aimed at overcoming these obstacles include: (1) advanced constrained near-surface tomography, which has significantly enhanced the robustness of near-surface velocity-depth model estimation, leading to improved resolution of deep reservoir images;(2) a recent ultra-long-offset (greater than 15 km) experiment in the foreland basin of the Tarim Oilfield, demonstrating that more accurate and deeper near-surface velocity models can be generated on land using turning-ray tomography;(3) finite-frequency wavepath tomography, which has been proven through field data examples to be a robust alternative to traditional full-waveform inversion for land seismic data;and (4) integrated tomography, which combines diving waves and reflected seismic data to develop a comprehensive velocity model from shallow to deep sections for anisotropic prestack depth migration from topography. These technologies, developed for and applied to the Tarim Basin, can be applied, with modifications, to other land basins around the world. © 2025 by The Society of Exploration Geophysicists.

关键词： Watersheds

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Integrated Well Network design Mode for CO2 EOr and Storage and its Application in L reservoir

Integrated Well Network Design Mode for CO2 EOR and Storage ...

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2025 International Petroleum technology Conference, IPTC 2025

作者： Wu, Zangyuan Tang, Yongliang Lian, Liming Zhou, daiyu Zhao, Haitao Shao, Guangqiang Feng, Qihong Zhou, Wei Li, Hong Bian, Wanjiang Zhang, Liang du, Hongbao Luo, Min Huang, Xingning Tarim Oilfield Company PetroChina Xinjiang Korla China R&D Center for Ultra-Deep Complex Reservoir Exploration and Development CNPC Xinjiang Korla China School of Petroleum Engineering China University of Petroleum East China Qingdao China Research Institute of Petroleum E&D Petrochina CNPC Beijing China Chengdu CK Energy Technology Co. Ltd. Sichuan Chengdu China

ISBN: (纸本)9781959025436

This paper addresses the challenge of difficulty in adjusting late-stage production in water-flooded reservoirs and proposes an integrated well network design mode for CO2 enhanced oil recovery (EOr) and storage. The well network is designed according to the full life cycle of carbon capture, utilization, and storage (CCUS), meeting the requirements of both CO2 EOr and storage phases. It extends the implementation time of CO2 EOr schemes to enhance oil recovery while ensuring effective CO2 storage, aligning with the overall strategy of global green and low-carbon development. The overall approach involves the use of a three-dimensional CO2 flooding injection and recovery well network, with progressive development in the vertical stratigraphic layers to maximize the utilization of existing old wells. The stratigraphic reconstruction involves the CO2 flooding injection and recovery well network, ensuring that new gas injection wells meet the requirements for CO2 injection processes and production rates, while also serving as replacements for gas injection in other stratigraphic layers. Production wells make use of the original old wells, and well completion methods are adjusted to achieve the development of replacement layers. The "top injection, middle production, bottom support" three-stage development method is designed to fully utilize the high points of reservoir microstructures and bottom water energy. Finally, well network optimization is achieved through streamline tracking simulation methods. The proposed technology has been applied in the CO2 enhanced oil recovery plan for the L reservoir. Initially focusing on CO2 flooding for oil recovery and shifting to CO2 storage later, it is projected to achieve a cumulative CO2 injection of tens of millions of tons over 46 years (including 40% recycled injection), with a displacement factor reaching 1.57PV. After deducting the recycled carbon amount, the cumulative carbon storage exceeds 6 million tons, affecting a vo

关键词： Crude oil

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Unveiling the roles of initial phase constituents and phase metastability in hydrogen embrittlement of TrIP-assisted VCrCoFeNi medium-entropy alloys

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材料科学技术（英文版） 2025年第4期207卷 160-176页

作者： Sang Yoon Song dae Cheol Yang Han-Jin Kim Sang-In Lee Hyeon-Seok do Byeong-Joo Lee Alireza Zargaran Seok Su Sohn Department of Materials Science and Engineering Korea University 02841 SeoulRepublic of Korea Green Energy Materials Research Team Hyundai Motor Company Uiwang R&D Center 16082 UiwangRepublic of Korea Institue of Advanced Technology Development Hyundai Motor Group 13529 SeongnamRepublic of Korea Department of Materials Science and Engineering Pohang University of Science and Technology 37673 PohangRepublic of Korea Graduate Institute of Ferrous & Energy Materials Technology Pohang University of Science and Technology37673 PohangRepublic of Korea

Medium-entropy alloys(MEAs)that exhibit transformation-induced plasticity(TrIP)from face-centered cubic(FCC)to body-centered cubic(BCC)are considered promising for liquid hydrogen environments due to their remarkable cryogenic ***,studies on hydrogen embrittlement(HE)in BCC-TrIP MEAs have not been conducted,although the TrIP effect and consequent BCC martensite usually deteri-orate HE *** these alloys,initial as-quenched martensite alters hydrogen diffusion and trap behavior,and deformation-induced martensitic transformation(dIMT)provides preferred crack propaga-tion sites,which critically affects HE ***,this study aims to investigate the HE behav-ior of BCC-TrIP MEAs by designing four V10Cr10Co30Fe50-xNix(x=0,1,2,and 3 at％)MEAs,adjusting both the initial phase constituent and phase metastability.A decreased Ni content leads to a reduced fraction and mechanical stability of FCC,which in turn increases HE susceptibility,as determined through electro-chemical hydrogen pre-charging and slow-strain rate tests The permeation test and thermal desorption analysis reveal that the hydrogen diffusivity and content are affected by initial BCC fraction,interconnec-tivity of BCC,and refined *** these initial phase constituents differ between the alloys with FCC-and BCC-dominant initial phase,microstructural factors affecting HE are unveiled discretely among these al-loy groups by correlation of hydrogen-induced crack behavior with hydrogen diffusion and trap *** alloys with an FCC-dominant initial phase,the initial BCC fraction and dIMT initiation rate emerge as critical factors,rather than the extent of *** BCC-dominant alloys,the primary contributor is an increase in the initial BCC fraction,rather than the extent or rate of *** unraveled roles of microstructural factors provide insights into designing HE-resistant BCC-TrIP MEAs.

关键词： Medium-entropy alloys(MEAs) Transformation-induced plasticity(TrIP) Hydrogen embrittlement Hydrogen-induced crack Hydrogen diffusion and trapping

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Study on the Fluid-Solid Coupling Seepage of the deep Tight reservoir Based on 3d digital Core Modeling

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Energy engineering 2025年第2期122卷 537-560页

作者： Haijun Yang Zhenzhong Cai Hui Zhang Chong Sun Jing Li Xiaoyu Meng Chen Liu Chengqiang Yang PetroChina Tarim Oilfield Company Korla841000China CNPC R&D Center for Ultra-Deep Complex Reservoir Exploration and Development Korla841000China National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580China Structure and Shipping Department Offshore Oil Engineering(Qingdao)Co.Ltd.Qingdao266520China

deep tight reservoirs exhibit complex stress and seepage fields due to varying pore structures,thus the seepage characteristics are significant for enhancing oil *** study conducted triaxial compression and permeability tests to investigate the mechanical and seepage properties of tight sandstone.A digital core of tight sandstone was built using Computed Tomography(CT)scanning,which was divided into matrix and pore phases by a pore equivalent diameter threshold.A fluid-solid coupling model was established to investigate the seepage characteristics at *** results showed that increasing the confining pressure decreased porosity,permeability,and flow velocity,with the pore phase becoming the dominant seepage *** and large pores closed first under increasing pressure,resulted in a steep drop in ***,permeability slightly decreased under high confining pressure,which followed a first-order exponential *** velocity increased with seepage *** the damage mainly occurred in stress-concentration regions under low seepage *** behavior followed linear darcy flow,the damage emerged at seepage entrances under high pressure,which decreased rock elastic modulus and significantly increased permeability.

关键词： digital core fluid-solid coupling pore structure microscopic seepage

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Effect of diamond powder grain size distribution on mechanical and application properties of PdC

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diamond and related Materials 2025年 155卷

作者： Ke, Xiaohua Ivankovic, Alojz Yang, Xiongwen Prasad, Vishnu Murphy, Neal Zhu, Xiaoqing School of Energy Resources China University of Geosciences Beijing China School of Mechanical &Materials Engineering University College Dublin Dublin Ireland CNPC Engineering Technology R&D Company Limited Beijing China

Three diamond powders (referred to as P1, P2 and P3) with size parameters for narrowness analysis (SPAN) of 0.5, 0.7 and 1.0 in the range of 10-20 μm with normal distribution characteristics were selected to produce PdC cutters (referred to as S1, S2 and S3) and further processed into PdC bits (referred to as Bit1, Bit2 and Bit3). The grain size distribution of the diamond powders, the microscopic characteristics and mechanical properties of the PdC cutters, and the application performance of the PdC bits were also evaluated. The tests showed that as the SPAN of the diamond powder decreases, the surface area average diameter (ds) decreases while the volume average diameter (dv) increases. The microstructural characteristics of PdC correlate more closely with ds. The wear resistance and thermal stability of PdC are correlated with ds, while the impact resistance of PdC is more influenced by dv. In the field test, Bit1 showed significant advantages compared to Bit2 and Bit3, the footage increased by 137% and 184%, the rate of penetration (rOP) increased by and 35% and 50% respectively. © 2025

关键词： Grain size and shape

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Slot recovery Based on the 3d dubins Curve Method

Slot Recovery Based on the 3D Dubins Curve Method

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2025 SPE/IAdC International drilling Conference and Exhibition, dC 2025

作者： Liu, Haoge Aadnøy, Bernt Sigve Gjersvik, Tor Berge Kaarstad, Eirik CNPC R&D DIFC Company Limited Department of Geoscience and Petroleum Norwegian University of Science and Technology Trondheim Norway Department of Geoscience and Petroleum Norwegian University of Science and Technology Trondheim Norway Department of Energy and Petroleum Technology University of Stavanger Stavanger Norway Three60 Energy Norway Bjørn Schmidt Krossnes Vår Energi AS Norway

ISBN: (纸本)9781959025641

This paper introduces the application of the 3d dubins curve method for sidetrack trajectory design in slot recovery. With the constraints and the objective given, the method can quickly determine the optimal sidetrack kickoff point (KOP) location and generate the optimal sidetrack trajectory in just seconds. robustness and efficiency of the method are demonstrated in the case studies with both synthetic data and real field data with various constraints such as location limits, angle limits and anticollision. The case studies also demonstrate how different constraints or objectives affect optimal sidetrack trajectory. Compared to the conventional sidetrack design process when complex constraints are involved, our method can be a game changer as it only cost seconds to investigate the objective subjected to the target and various constraints information. Copyright 2025, SPE/IAdC International drilling Conference and Exhibition.

关键词： Trajectories

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