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Exploring the synergistic effects and mechanistic insights of ionic and polyionic liquid combinations as shale inhibitors

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Petroleum Science 2025年第04期 1566-1577页

作者： Jia-Jun dai Kai-He Lv Jin-Sheng Sun Han Jia Xian-Bin Huang Jian Li Shandong Key Laboratory of Oilfield Chemistry School of Petroleum Engineering China University of Petroleum (East China) Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)) Ministry of Education CNPC Engineering Technology R & D Company Limited

Ionic liquids（ILs）, recognized for their negligible vapor pressure, thermal stability, and structural tailorability, offer targeted inhibition of clay expansion. Compared to ILs, polyionic liquids（PILs） possess stronger mechanical properties and adsorption capabilities, showing even greater potential in inhibiting clay swelling. In this work, we synthesized and characterized an imidazole-based ionic liquid（IL-NH2）, a polyionic liquid（PIL-ABHIm）, and a PIL/IL combination. Their inhibitory performance was rigorously evaluated under simulated drilling conditions through immersion tests, linear swelling tests, among others. Additionally, the mechanisms underlying their interaction with clay minerals were elucidated through contact angle measurements, Fourier-transform infrared spectroscopy, X-ray diffraction（Xrd）,Zeta potential analysis, and molecular electrostatic potential（MEP） analysis. This work demonstrates that IL-NH_ 2inhibits osmotic hydration by altering the interlayer structure of the clay, while PIL-ABHIm reduces surface hydration by forming a hydrophobic barrier on the clay surface. PIL/IL combines both mechanisms, significantly enhancing the stability of clay through the dual mechanisms of cation exchange and hydrophobic barriers. These findings reveal an innovative mechanism by which PIL/IL combination inhibits clay hydration and swelling, providing a scientific foundation for their application in drilling fluids.

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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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Mesoporous SiO_(2)nanoparticles with low surface energy and multi-level roughness as shale wellbore stabilizers in oil-based drilling fluid

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Petroleum Science 2025年第1期22卷 384-397页

作者： Hong-Yan du Kai-He Lv Jin-Sheng Sun Mei-Chun Li Yuan Geng Xian-Bin Huang Hao-Kun Shen Muhammad Arqam Khan School of Petroleum Engineering China University of PetroleumEast ChinaQingdao266580ShandongChina Key Laboratory of Unconventional Oil&Gas Development Ministry of EducationQingdao266580ShandongChina CNPC Engineering Technology R&D Company Ltd. Beijing102206China Co-Innovation Center of Efficient Processing and Utilization of Forest Resources College of Materials Science and EngineeringNanjing Forestry UniversityNanjing210000JiangsuChina Department of Petroleum Engineering NED University of Engineering&Technology395007Pakistan

Oil-based drilling fluids possess excellent properties such as shale inhibition,cuttings suspension,and superior lubrication,making them essential in the development of unconventional oil and gas ***,wellbore instability,caused by the invasion of drilling fluids into shale formations,remains a significant challenge for the safe and efficient extraction of shale oil and *** work reports the preparation of mesoporous SiO_(2) nanoparticles with low surface energy,utilized as multifunctional agents to enhance the performance of oil-based drilling fluids aimed at improving wellbore *** results indicate that the coating prepared from these nanoparticles exhibit excellent hydrophobicity and anti-fouling properties,increasing the water contact angle from 32°to 146°and oil contact angle from 24°to 134.8°.Additionally,these nanoparticles exhibit exceptional chemical stability and thermal *** these nanoparticles into oil-based drilling fluids reduced the surface energy of the mud cake from 34.99 to 8.17 mJ·m×2 and increased the roughness of shale from 0.26 to 2.39 *** modifications rendered the mud cake and shale surfaces amphiphobic,effectively mitigating capillary infiltration and delaying the long-term strength degradation of shale in oil-based drilling *** 28 days of immersion in oil-based drilling fluid,shale cores treated with MF-SiO_(2) exhibited a 30.5%increase in compressive strength compared to untreated ***,these nanoparticles demonstrated the ability to penetrate and seal rock pores,reducing the API filtration volume of the drilling fluid from 11.2 to 7.6 *** study introduces a novel approach to enhance the development of shale gas and oil resources,offering a promising strategy for wellbore stabilization in oil-based drilling fluid systems.

关键词： Fluorosilane Wettability Wellbore stability drilling engineering Self-cleaning Antifouling

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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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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 Qingdao266580 China Shandong Qingdao266580 China CNPC Engineering Technology R&D Company Limited Beijing102206 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： Surface chemistry

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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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Hydrate reformation Characteristics in Offshore Natural Gas Hydrate reservoir Using the Horizontal Well depressurization Production

Hydrate Reformation Characteristics in Offshore Natural Gas ...

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Offshore technology Conference, OTC 2025

作者： Zhang, Jianbo Liu, Xiaoao Luo, Jiazheng Sun, Xiaohui Zhong, Jie Wang, Zhiyuan Huang, Weian Sun, Baojiang Wang, Xiao School of Petroleum Engineering China University of Petroleum East China Shandong Qingdao China Shandong Key Laboratory of Offshore Oil & Gas and Hydrates Development Shandong Qingdao China CNPC Engineering Technology R&D Company Limited Beijing China No.7 Oil Production Plant PetroChina Changqing Oilfield Company Shanxi Xian China College of Computer Science and Technology China University of Petroleum East China Qingdao China School of Materials Science and Engineering China University of Petroleum East China Qingdao China

ISBN: (纸本)9781959025610

during depressurization production of natural gas hydrate, the reformation of hydrate is likely to occur in the reservoir, hindering the efficient development of hydrate. Previous studies on the reformation of hydrate in the process of natural gas hydrate production were mainly focused on experimental research and numerical simulation under experimental conditions. In this work, a multi-field coupling flow model considering the effect of hydrate reformation during depressurization production of hydrate reservoir was established, and the accuracy of the model was verified by the field measured data. Meanwhile, the reformation characteristics of hydrate in the reservoir using the horizontal well depressurization production were simulated and investigated. The results show that the reformation of hydrate in the reservoir mainly occurs in the upper part and middle boundary of the hydrate decomposition zone during the depressurization production. Moreover, the smaller the pressure drop extent, absolute permeability and initial hydrate saturation, and the deeper the horizontal well, the larger the hydrate secondary formation zone in the reservoir, the faster the rate of hydrate reformation, and the greater the hydrate saturation caused by hydrate reformation would be, which would make the risk of flow blockage by reformed hydrate in the reservoir rise. The results of this study can provide theoretical support for the safe and efficient development of offshore natural gas hydrate. © 2025, Offshore technology Conference.

关键词： Offshore gas well production

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Investigation of Acoustic Properties in Casing for Water-Filled Wells Pipe 24

Investigation of Acoustic Properties in Casing for Water-Fil...

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4th International Conference on Signal Processing and Communication technology, SPCT 2024

作者： Qu, Congfeng Liu, Binhui Guo, Xinchao Hu, Yuannong Chen, Jiandong Lin, Shengbo Wang, Zhongmiin China National Petroleum Corporation Engineering Technology R&D Company Limited Beijing China Hangzhou Applied Acoustic Research Institute Zhejiang Hangzhou China Jilin University Jilin Changchun China Institute of Automation Qilu University of Technology Shandong Jinan China

ISBN: (纸本)9798400710636

To enable long-distance communication within water injection well tubes, we leverage hydroacoustic communication technology for the required research. This study presents a theoretical analysis and experimental measurements of transmission attenuation in a steel pipe with a 110 mm diameter and 110 m length, fully filled with water. Based on the findings, it is recommended that acoustic signals be transmitted at frequencies no lower than 4346 Hz. Hydroacoustic signals were measured across frequency ranges of 2 kHz to 13 kHz and 4 kHz to 13 kHz, revealing average attenuation rates of 14 dB and 19 dB per 100 m, respectively. These values are lower than the geometric propagation attenuation observed in free space. As the frequency increases, attenuation also increases, in alignment with both theoretical predictions and empirical observations. The experimental results further demonstrate that the attenuation pattern in the frequency domain follows a logarithmic trend within the well pipe. © 2024 Copyright held by the owner/author(s).

关键词： Injection (oil wells)

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From data to decisions: AI-Augmented geoscience and engineering in natural gas industry

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Natural Gas Industry B 2025年第2期12卷 101-109页

作者： Pang, Huiwen dong, Shaoqun Tan, Peng Wang, Hanqing Li, Jiabao College of Science China University of Petroleum (Beijing) Beijing 102249 China College of Artificial Intelligence China University of Petroleum (Beijing) Beijing 102249 China CNPC Engineering Technology R&D Company Limited Beijing 102206 China Petroleum Exploration and Production Research Institute SINOPEC Beijing 102206 China Resource Geophysics Academy Imperial College London London SW7 2BP United Kingdom

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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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