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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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Simulation of rock-Breaking Ability of Polycrystalline diamond Compact Cutter Based on rock Mechanics Experiment After Heat Treatment

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Journal of Energy resources technology, Part B: Subsurface Energy and Carbon Capture 2025年第2期1卷 021007页

作者： Yin, Qishuai Wen, Zhiliang ren, Laiao Qu, Ximo Li, Qianyu Zhou, Bo MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China China Oilfield Services Limited Tianjin 300451 China https://***/041qf4r12China University of Petroleum Beijing MOE Key Laboratory of Petroleum Engineering China University of Petroleum Beijing 102249 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

When drilling in geothermal and deep formations, the rock-breaking mechanism of high-temperature formations is not clear. In this work, mechanical tests of rocks subjected to high temperatures were carried out, and rock-breaking models of bottom hole thermal stress dispersion and polycrystalline diamond compact (PdC) cutter were established. Aiming at efficient rock breaking pursued by drilling in high-temperature formation, rock-breaking simulations of PdC cutters with different front rake angles under the condition of temperature and confining pressure changes were carried out based on critical penetration depth. The mechanism of rock breaking is analyzed from the point of view of stress variation in the process of brittle rock breaking. The study shows that rock plasticity is enhanced after high temperature, and the temperature difference between the drilling fluid and bottom hole will make the outer part of the bottom hole shrink obviously. Under the conditions of this study, the optimal rock-breaking angle of the PdC cutter is 20 deg. The confining pressure of deep high-temperature formation will hinder rock breaking at a lower value range, and rocks under high confining pressure are more prone to brittle fracture. The increase of rotational speed has an obvious promotion stage for efficient rock breaking, and too large rotational speed will result in low brittle rock-breaking efficiency. These works are helpful in understanding the efficient brittle rock-breaking mechanism in high-temperature drilling, and can provide references for tooth design and rotational speed optimization of PdC bits.

关键词： critical cutting depth high-temperature drilling parameter optimization numerical simulation geothermal energy petroleum wells-drilling/production/construction geomechanics

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Modeling transport and bridging behavior of lost circulation materials in a hydraulic fracture

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Journal of rock Mechanics and Geotechnical engineering 2025年第5期17卷 2650-2664页

作者： Cheng, Shaoyi Wu, Bisheng Huppert, Herbert E. Ma, Tianshou Chen, Zhaowei Tan, Peng State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering Tsinghua University Beijing 100084 China Key Laboratory of the Hydrosphere Sciences of the Ministry of Water Resources Beijing 100084 China Institute of Ocean Engineering Tsinghua University Beijing 100084 China Institute of Theoretical Geophysics King's College University of Cambridge Cambridge CB2 1ST United Kingdom State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Southwest Petroleum University Sichuan Chengdu 610500 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

Lost circulation of drilling fluid is one of the most common and costly problems in drilling operations. This highlights the importance of wellbore strengthening treatment sthat can utilize lost circulation materials (LCMs) to seal fractures associated with the wellbore. In this work, a numerical model accounting for the deformation of surrounding rock, fluid flow in the fracture, fracture propagation, and the transport of LCMs is presented to investigate the wellbore strengthening, from the fracture initiation to the fracture arrest, due to plugs formed by LCMs. The equations governing the rock deformation and fluid flow are solved by the dual boundary element method and the finite volume method, respectively. The transport of LCMs is solved based on an empirical constitutive model in suspension flow, and several characteristic quantities are derived by dimensional analysis. It is found that two dimensionless parameters, dimensionless toughness and normalized initial particle concentration, control the migration of LCM particles. The numerical results show that the dimensionless toughness influences the entrance and bridging of LCMs while the initial concentration controls the location of the particle bridging. When the initial concentration is larger than 0.8, the particle bridging tends to occur near the fracture entry. Conversely, when the initial concentration is less than 0.8, the particle bridging occurs near the fracture tip. This work provides an effective tool to predict the LCM transport and plugging in the wellbore strengthening process. © 2025 Institute of rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Bridging location dimensional analysis Hydraulic fracture Lost circulation materials (LCMs) Particle bridging Wellbore strengthening

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Suppressed grain boundary scattering effect to enhance electrical transport properties of La0.815Sr0.185MnO3 polycrystalline ceramic via high-temperature sintering process

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Ceramics International 2025年

作者： Liang, Xiaolu Chen, Zihao Wang, Zhenyu Pan, Zimeng Wang, Yao Wang, Haitao Sun, Jiankun Ma, Jun Jiang, Xuexing Peng, Jubo Gu, Xin Zhang, Jing Liu, Xiang Faculty of Material Science and Engineering Kunming University of Science and Technology Yunnan Kunming650093 China Kunming Kaihang Optoelectronic Technology Co. LTD Yunnan Kunming650200 China Company Limited R&D Center Yunnan Kunming650106 China

Polycrystalline La0.815Sr0.185MnO3 (LSMO) ceramic was synthesized using the sol-gel method. The effect of varying sintering temperatures (1763, 1783, 1803 and 1823 K) on the microstructure and electrical transport properties were systematically investigated. The samples exhibited a distinct dual-peak metal-insulator transition, with the first peak (Tp1) primarily influenced by grain boundary (GB) scattering effect. At lower sintering temperatures, lattice strain induced by the ionic size mismatch between La3+ and Sr2+ ions is transferred to the grain boundaries, increasing their contribution to resistivity. As the sintering temperature rises, the grain boundary effect diminish, leading to a suppression of the Tp1 peak. Elevated sintering temperatures further promote hybridization effect, enhancing the double exchange mechanism. As the temperature increases, this mechanism gradually becomes dominant, leading to a more pronounced influence of the Tp2 peak. Additionally, higher sintering temperatures reduce grain boundary scattering, improving the temperature coefficient of resistivity (TCr). At an optimal sintering temperature of 1803 K, the LSMO ceramic achieved a peak TCr of 10.78 % K−1 near room temperature (284.8 K), demonstrating strong potential for improved performance in uncooled infrared bolometers or electronic switch devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

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dynamic covalent carbon dot-based emulsifiers: A novel strategy for smart Pickering emulsions and enhanced heavy oil recovery in ultra-low permeability reservoirs

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Journal of Colloid and Interface Science 2025年 697卷 137935页

作者： Fan, Junjie Cui, Jianpeng He, Tinglei Zhang, Tianhao Yuan, Xinyu Hu, Jianwen Gao, Haotian Zhang, Hong Li, Chunling Hu, Songqing Sun, Shuangqing Shandong Key Laboratory of Intelligent Energy Materials School of Materials Science and Engineering China University of Petroleum (East) Shandong Qingdao 266580 China Institute of Advanced Materials China University of Petroleum (East) Shandong Qingdao 266580 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China

Carbon dots (Cds), a class of fluorescent nanomaterials distinguished by their unique properties such as tunable surface chemistry and nanoscale dimensions, have garnered significant attention. In this study, we synthesize Cds-based emulsifiers through a combination of hydrothermal synthesis and hydrophobic modification utilizing dynamic covalent imine bonds, imparting them with amphiphilicity and pH-responsiveness. These carbon dot-based emulsifiers stabilize the oil–water interface to form Pickering emulsions and enable the reversible regulation of amphiphilicity through pH-induced cleavage and reformation of imine bonds, thereby facilitating transitions between emulsification and demulsification. Furthermore, the amphiphilic Cds effectively reduce oil–water interfacial tension and exhibit potential application in mobilizing heavy oil in ultra-low permeability reservoirs. Consequently, we observed a 28.78 % decrease in injection pressure and an 18.65 % increase in recovery rates. Experimental and theoretical results reveal that the Cds adsorb onto both solid and oil phase surfaces, modulating the interfacial properties and enabling the oil film attached to the rock wall to be more easily stripped off during water flushing. Additionally, the small size of the Cds allowed them to enter finer pore throats and effectively displace the residual oil film. This unique characteristic holds significant promise for future advancements in the fields of smart-response Pickering emulsions and enhanced oil recovery in ultra-low permeability reservoirs. © 2025

关键词： Carbon dots dynamic covalent imine bonds Enhanced oil recovery pH-responsive Pickering emulsion

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Evaluation of dynamic inter-well connectivity by using the state-variable-capacitance model

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Petroleum Science 2025年

作者： Li-Wen Guo Shi-Yuan Qu Yuan-Yuan Lei Zhi-Hong Kang Shuo-Liang Wang School of Energy Resources China University of Geosciences Beijing 100083 China CNPC Engineering Technology R&D Company Limited Beijing 100083 China

during oilfield development, a comprehensive model for assessing inter-well connectivity and connected volume within reservoirs is crucial. Traditional capacitance (TC) models, widely used in inter-well data analysis, face challenges when dealing with rapidly changing reservoir conditions over time. Additionally, TC models struggle with complex, random noise primarily caused by measurement errors in production and injection rates. To address these challenges, this study introduces a dynamic capacitance model (SV-dC) based on state variables. By integrating the extended Kalman filter (EKF) algorithm, the SV-dC model provides more flexible predictions of inter-well connectivity and time-lag efficiency compared to the TC model. The robustness of the SV-dC model is verified by comparing relative errors between preset and calculated values through Monte Carlo simulations. Sensitivity analysis was performed to compare the model performance with the benchmark, using the Qinhuangdao Oilfield as a case study. The results show that the SV-dC model accurately predicts water breakthrough times. Increases in the liquid production index and water cut in two typical wells indicate the development time of ineffective circulation channels, further confirming the accuracy and reliability of the model. The SV-dC model offers significant advantages in addressing complex, dynamic oilfield production scenarios and serves as a valuable tool for the efficient and precise planning and management of future oilfield developments.

关键词： Capacitance model Inter-well connectivity Time-lag coefficient Connected volume reservoir simulation

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An Artificial Intelligence Algorithm for the real-Time Early detection of Sticking Phenomena in Horizontal Shale Gas Wells

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Fluid dynamics & Materials Processing 2023年第10期19卷 2569-2578页

作者： Qing Wang Haige Wang Hongchun Huang Lubin Zhuo Guodong Ji CNPC Engineering Technology R&D Company Limited Planning and Support InstituteBeijing102206China

Sticking is the most serious cause of failure in complex drilling *** the present work a novel“early warning”method based on an artiﬁcial intelligence algorithm is proposed to overcome some of the known pro-blems associated with existing sticking-identiﬁcation *** method is tested against a practical case study(Southern Sichuan shale gas drilling operations).It is shown that the twelve sets of sticking fault diagnostic results obtained from a simulation are all consistent with the actual downhole state;furthermore,the results from four groups of veriﬁcation samples are also consistent with the actual downhole *** shows that the pro-posed training-based model can effectively be applied to practical situations.

关键词： Shale gas drilling sticking fault artificial intelligence risk early warning technology

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A novel characterization and evaluation method of flow field and its application

A novel characterization and evaluation method of flow field...

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Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Qiao, Yan Yang, Xiangtong Zhang, Yang Wang, Yonghong Hou, Tengfei Huang, Bo Shang, Litao Li, Huili CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

At present, most of the oil fields in eastern China have entered the stage of high water cut development, with a comprehensive water cut of over 90% and an oil recovery of less than 30%. To improve oil recovery, the flow field must be described qualitatively and quantitatively, so as to provide a basis for the formulation of measures. This paper proposes two categories of indicators: one is a guideline for developing measures, including streamline bundle properties, and the other is an indicator for evaluating the effects of measures, remaining oil dispersion (rOd) and dynamic heterogeneity included. Through numerical simulation methods, the regularity research and adaptive evaluation of each flow field characterization indicator are carried out. Finally, according to the streamline bundle properties of block E, the liquid rate of injection and production wells were optimized, and the effectiveness of the optimization was evaluated. The study found that under the condition of fixed well pattern, the streamline bundle flow (SF) between wells is relatively stable, and the change in streamline bundle potential (SP) and streamline bundle oil cut (SOC) tends to decrease with time. The typical curve of rOd generally includes four stages, and the effectiveness of measures is judged by the trend of rOd. For dynamic heterogeneity, the change curve generally includes unstable stage and stable stage. The value of the stable stage value can reflect the heterogeneity of the flow field. The larger the value, the stronger the heterogeneity of the flow field. According to the streamline bundle properties, three liquid rate optimization strategies, which are streamline bundle flow method (SFM), streamline bundle potential method (SPM), and streamline bundle oil cut method (SOM), are proposed, and the effectiveness of the measures is evaluated using rOd and dynamic heterogeneity. After liquid rate optimization, the rOd of the reservoir in Block E increased and decreased later, the Lo

关键词： Flow fields

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Implementing managed pressure drilling technique in drilling an offshore exploration well

Implementing managed pressure drilling technique in drilling...

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Offshore technology Conference Asia 2020, OTCA 2020

作者： Cai, Xiao Guo, Qingfeng Zhao, Qing CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613996812

The managed pressure drilling technique has been widely applied in land to solve different technical and well control issues as well as ensuring the safety of field personnel. Offshore exploration drilling is one of the most challenging operations due to its nature of drilling hazards and facing environment. There is a great need of applying managed pressure technique in offshore drilling. A new MPd equipment is developed, which is named as pressure control drilling system (PCdS), and performs its first application in offshore drilling to reach its further potential. The PCdS is applied in an exploration well located in the gulf of Bohai to perform a near-balanced drilling operation for the purpose of reducing the density of drilling fluid. It utilizes the microflux control technique to precisely monitor the wellbore condition and detect the overflow and loss of circulation in time. The technique of constant bottom hole pressure is used by the PCdS to maintain the bottom hole pressure constant and minimize the fluctuations of bottom hole pressure during making connections and round trip, enhancing the drilling performance. The equivalent circulating density of 1.08-1.09 g/cm3 is obtained by the proposed PCdS using the solid-free drilling fluid with a density of 1.03g/cm3. While nearby wells use the drilling fluid with the density of 1.15-1.20 g/cm3 at the same Stratum. Cooperated with the drilling fluid of lower density, utilization of the proposed pressure control drilling system significantly avoids the formation damage. The chip hold-down effect is minimized by the proposed PCdS to increase the rOP. The average rOP of nearby wells is 4.02 m/h. While the average rOP of the well using the proposed PCdS is 7.23 m/h, indicating the increase of 80 percent. With the assistance of the proposed PCdS, the drilling team set a single bit footage record of 312.88 m and daily footage record of 163 m, which demonstrates a great improvement of operation efficiency. No drilling

关键词： drilling fluids

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research on radial drilling technology of high efficient rock breaking under high temperature deep well conditions

Research on radial drilling technology of high efficient roc...

引用

Abu dhabi International Petroleum Exhibition and Conference 2020, AdIP 2020

作者： Chen, Zhi Zhu, Feng Hu, Qiangfa Zhang, Youjun Lv, Weiping CNPC Engineering Technology R&D Company Limited

ISBN: (纸本)9781613997345

The current radial well operation technology can not adapt to high temperature, and the long tripping period and low drilling efficiency in deep well *** to the characteristics of abrasive jet, a new radial drilling method is proposed in this paper, in which the abrasive jet is conveyed to the underground by CT (coiled tubing), the casing is sidetracked first, and then the formation is drilled. The working procedure is that using the CT to run the positioning and guiding tool in hole first, and then using the CT to run a steel tube in hole. When the steel tube reaches the deflector, it makes a radial turn, and the ground equipment transfers the abrasive drilling fluid to down hole through the CT. during the operation, the casing sidetracking is completed with drilling fluid with high abrasive concentration, then the abrasive concentration is reduced, and the steel tube enters the formation to complete the radial drilling. Practice has proved that when the well temperature exceeds 100°C the jet hose is easy to be damaged under high temperature and high pressure environment, resulting in leakage of drilling fluid and unable to complete the operation normally. It is necessary to select a suitable temperature-resistant jet hose. Practice has proved that when the well depth is more than 4000 meters, the pressure loss along the system increases and the jet water power from the nozzle decreases. For hard formation, the water jet is not enough for rock breaking drilling in the formation. The results show that under the same water power condition, abrasive jet has stronger ability to break rock and penetrate hard stratum than water jet because it contains solid particles with higher hardness and density. At the same time, the abrasive water jet with suitable abrasive concentration and water power can be used for casing sidetracking. The casing sidetracking and formation drilling are combined to simplify the process. Experiments show that the types of abrasiv

关键词： rocks

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