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Development Strategy of cnpc engineering technology Service

China Oil & Gas 2011年第3期18卷 42-47页

作者： Yang Qingli Liu Bingyi Zheng Yi Zhu Jingping Jiang Xinsheng CNPC Engineering Technology Company CNPC Advisory Center

An overview of cnpc engineering technology service As an important backup and guarantee for cnpc＇s oil and gas business, engineering technology service companies have focused on the goal of building an integrated international energy company, and launched new round of specialized restructuring and business integration since the end of 2007, in accordance with the principle of intensification, specialization, and integration.

关键词：中国石油天然气集团公司技术服务石油工程业务整合能源公司服务公司工程技术专业化

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Untreatment reutilization of high-salinity flowback fluid and produced water to prepare fracturing fluid by using associative thickener

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Petroleum 2025年第1期11卷 23-40页

作者： Yan Liang Sukai Wang Guiyi Zhang Yonglong Li Wei Liu Songlin Pu Lipeng Zhang Tianxiang Wang Lianghui Wan Xionghui Liu Engineering Technology Research Institute CNPC Western Drilling Engineering Co. LTD Drilling Fluid Company CNPC Western Drilling Engineering Co. LTD

Reutilizing flowback fluid and produced water to prepare fracturing fluid is still an urgent problem that needs to be solved and is not well *** this work,an anti-salt associative thickener（AAT） was synthesized by free radical copolymerization,and the molecular structure of AAT was demonstrated by FTIR *** re,compared with a common anti-salt thickener（HAT）,the comprehensive performances of AAT we re systematically investigated under the conditions of fresh water,flowback fluid and produced water in Sulige Gas *** results show that under the conditions of an average salinity of 34,428 mg/L and an average high-valent ion content of 4967 mg/L,AAT can present good thickening capacity,temperature and shear resistance,drag reduction efficiency,sand-carrying ability,gel-breaking property and high-effective crosslinking capacity with organic zirconium crosslinker at high salinity,which implicates the great potential and feasibility to prepare fracturing fluid by reutilizing high-salinity flowback fluid and produced water without further ***,the possible mechanisms of the associative thickener to achieve high-effective drag reduction and sand-carrying might be the existence of reversible supramolecular structures and the significant increase of viscoelasticity by shear stretching in turbulent *** the same time,both physical and chemical interaction can make a significant contribution to high-effective crosslinking capacity of associative *** results and findings can provide an important reference for the design of novel fracturing fluid and the reutilization of highsalinity water in stimulation applications.

关键词： Hydraulic fracturing Flowback fluid Produced water Reutilization without treatment Drag reduction and sand-carrying Associative thickener Physical and chemical interaction

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Research and Application of Drilling engineering Monitoring and Remote Support technology for cnpc Key Wells 1

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11th International Field Exploration and Development Conference, IFEDC 2021

作者： Zhao, Tong Wu, Hua Xu, Sheng-jiang Ge, Yun-hua Mei, Yun-yi Zhang, Yan-long CNPC Engineering Technology R&D Company Limited Beijing China Institute of Engineering and Technology Xinjiang Oilfield Company Karamay China Unconventional Petroleum Research Institute China University of Petroleum Beijing China

ISBN: (数字)9789811921490

ISBN: (纸本)9789811921483

The global oil and gas industry is in a critical period of digital transformation. Digital technologies such as the Internet of Things (IoT), cloud computing, big data, artificial intelligence (AI), and blockchain help accelerate the digital transformation and intelligent development of petroleum companies. The remote drilling support technology (RDST) integrates drilling engineering and digital technologies to promote lean management in the drilling process. engineering Information Smart Center (EISC) was developed based on RDST for intelligent drilling optimization design. The center could be used to improve the drilling speed, efficiency, and quality based on Measurement While Drilling (MWD) data. It could also be used to enhance the early detection rate and disposal rate of complex drilling accidents. The application of EISC has promoted economic development and safety production in many oil and gas fields. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Big data

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A novel critical velocity model for the incipient motion of non-spherical particles on cuttings bed in extended reach wells

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Particuology 2025年第2期97卷 193-206页

作者： Wei Hu Ning Guan Jinya Zhang Binggui Xu Hongwu Zhu College of Mechanical and Transportation Engineering China University of PetroleumBeijing102249China CNPC Engineering Technology R&D Company Limited Beijing102206China

Accurately predicting the minimum velocity required to initiate particles movement on a cuttings bed surface during drilling operations is crucial for efficient and cost-effective removal of deposited ***,current models neglect the influence of particle shape on the drag coefficient and static friction coefficient during rolling and sliding on a cuttings ***,this study developed an experimental setup for cuttings transport and employed both theoretical analysis and experimental methods to investigate the critical velocity for the incipient motion of particles under various operational conditions.A novel semi-mechanical criterion model was developed for the incipient motion of particles,incorporating a shape correction factor for non-spherical particles.A balance equation for the threshold Shields number,determined by particle driving forces and resistances,was established,and a numerical procedure was formulated to determine the critical velocity for the incipient motion of *** model predictions show strong agreement with experimental *** study found that higher eccentricity,inclination,and fluid viscosity increased the difficulty of initiating particle movement on the cuttings bed surface,thus requiring higher annular velocities for effective cuttings ***,increasing particle size facilitated easier removal of the cuttings *** to non-Newtonian fluids,Newtonian fluids proved more effective in cuttings *** findings of this study are significant for optimizing hole cleaning parameters and improving the efficiency of cuttings removal.

关键词： Cuttings transport Critical velocity Predictive model Particle shape effect Experimental study

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Co@C-N as an electronic mediator anchored with Cu2O nanoparticles enables efficient photoreduction of CO2 to CO with nearly 100% selectivity

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Science China Chemistry 2025年第5期68卷 2160-2169页

作者： Xingbin Pan Xiuzheng Deng Jingshan Fan Jiangchuan Liu Changhai Liu Zhongyu Li Qian Liang Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology CNPC-CZU Innovation AllianceSchool of Petrochemical EngineeringChangzhou University School of Materials Science & Engineering Changzhou University

Solar-driven CO2conversion into value-added chemical provides an attractive strategy for sustainable ***,the enhanced CO2photoreduction performance with target product selectivity remains a major ***,we develop a novel strategy involving Cu2O nanoparticles in situ grown on the surface of ZIF-67-derived Co@C-N nanocages（CC） to create abundant active sites and appropriate heterointerfaces.A remarkable CO selectivity of 95.7% with a yield of 117.39 μmol g-1h-1and an apparent quantum efficiency as high as 1.88% at 420 nm was obtained over CC-60 catalyst in pure water,which was 87.6 times higher than that of pure *** calculations and experiments indicated that Co@C-N nanocages as charge mediator not only rapidly trap photogenerated electrons to promote charge separation efficiency,but also regulate the d-band center of Cu atoms to move to the Fermi energy level,thereby optimizing the reaction kinetics to facilitate the highly selective conversion of the key intermediate*CO desorption to CO.

关键词： Co nanocage electronic mediator interface regulation photocatalytic CO2 reduction high selectivity

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Simulation of Low-Tension-Gas Flood in a High-Temperature and Heterogeneous Sandstone Reservoir

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SPE Journal 2025年第4期30卷 2155-2170页

作者： AlAbdullah, Mohammad B. Delshad, Mojdeh Niu, Fangya Mohanty, Kishore Sepehrnoori, Kamy Li, Jianshen Zhou, Nancy C. Lu, Meng Miao, Jijun Kuwait University Kuwait The University of Texas at Austin United States CNPC Engineering Technology R&D Company Limited Beijing China CNPC United States SimTech Kuwait

This study explores low-tension-gas flooding (LTG) as a hybrid low-tension surfactant and nitrogen gas-enhanced oil recovery (EOR) method for a high-temperature (90–100°C) and heterogeneous (permeability 0.06 µd–1180 md) sandstone reservoir. A significant research gap exists in developing EOR technologies tailored for reservoirs with extreme heterogeneity and high temperatures. This study addresses this gap by integrating laboratory and simulation studies to model phase behavior, foam quality, and recovery factors (RFs) and then upscale these findings to a pilot scale. We began with history matching two corefloods, an outcrop, and a reservoir core, employing the in-house UTCHEM simulator. Flow parameters were derived from these corefloods, and fluid properties were ascertained from laboratory experiments. A 0.6-acre pilot-scale model in UTCHEM, based on field data, was used to simulate the LTG process. The comprehensive field scale sensitivity study indicates an incremental oil recovery (IOR) factor (RF) between 11% and 18% from LTG injection, influenced primarily by residual oil saturation to waterflood, injection rate, LTG slug size, and surfactant concentration. Gravity segregation between gas and microemulsion phases, affected by reservoir vertical heterogeneity, emerged as a critical factor. A lower kv/kh ratio led to a more stable front with a moderate gas override. Based on the technical feasibility of this study, an optimal chemical injection design involves 1 wt% surfactant concentration within 1 pore volume (PV) of LTG slug. Higher injection rates resulted in increased oil recovery and shorter pilot duration, though constrained by field operational limits. Adjusting foam quality during LTG injection affected gravity segregation, necessitating further laboratory experiments for correlation with gas mobility reduction. Foam shear thinning could enhance field foam injectivity without significantly impacting cumulative oil recovery. Increasing the injection ra

关键词： Shear thinning

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Numerical simulation of gas kick evolution and wellbore pressure response characteristics during the deepwater dual gradient drilling

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Petroleum Science 2025年第1期22卷 398-412页

作者： Geng Zhang Hong-Wei Yang Jun Li Hui Zhang Hong-Lin Huang Biao Wang Wen-Xu Wang Hao Chen China University of Petroleum-Beijing China University of Petroleum-Beijing at Karamay CNOOC Hainan Branch Engineering & Technical Operation Center CNPC Xinjiang Oilfield Company Research Institute of Engineering Technology

The gas kick represents a major risk in deepwater oil and gas exploration. Understanding the dynamics of gas kick evolution and the associated pressure response characteristics is critical for effective well control. In this paper, we introduce a transient wellbore multiphase flow model specifically developed to simulate gas kick in deepwater dual-gradient drilling, incorporating a downhole separator. The model accounts for the variable mass flow within the annulus and heat exchange between the annular fluid and the formation. Using this model, we analyzed the multiphase flow and thermodynamic behavior during the gas kick. Simulation results reveal a progressive increase in bottom-hole temperature, underscoring its potential as a key indicator for gas kick early detection. Additionally, variable gradient parameters affect not only the annular equivalent circulating density(ECD) profile but also the evolution of the gas kick. The inclusion of a downhole separator alters the annular ECD profile, creating a “broken line” shape,which enhances adaptability to the multi-pressure systems typically encountered in deepwater formation. By adjusting factors such as hollow sphere concentration, separator position, and separation efficiency, the annular ECD profile can be effectively customized. This study provides important theoretical insights and practical applications for utilizing dual-gradient drilling technology to address challenges in deepwater formation drilling.

关键词： Gas kick Multiphase flow Dual gradient drilling Equivalent circulating density Downhole separator

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CCUS:A Panacea or a Placebo in the fight against climate change?

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Green Energy & Environment 2025年第2期10卷 239-243页

作者： Yuxin Zhao CNPC Tubular Goods Research Institute(TGRI) Xi'an710077China School of Mechanical Engineering Hebei University of TechnologyTianjin300401China

Carbon Capture,Utilization,and Storage(CCUS)is a crucial technology for achieving carbon neutrality,but it faces significant *** substantial investments and policy support,CCUS projects have underperformed due to technical difficulties,high costs,and controversies surrounding the fossil fuel industry's *** effectiveness and feasibility of CCUS in reducing carbon emissions remain *** viewpoint provides a comprehensive analysis of the current state of CCUS technology,examining its potential to reduce carbon emissions,the challenges hindering its deployment,and the strategies needed to overcome these *** discuss the need for a combinatorial approach to unlock CCUS's full potential,and also emphasize the importance of selecting optimal CO_(2)utilization pathways to maximize economic benefits and CO_(2)*** CCUS faces technical,economic,and social barriers,it can still play a valuable role in mitigating emissions from hard-to-abate sectors when supported by comprehensive strategies and collaborative efforts among governments,industries,and research *** addressing these challenges and investing in innovation,CCUS can contribute to achieving carbon neutrality and building a sustainable,low-carbon future.

关键词： CCUS Carbon neutrality Net-zero emissions Fossil fuel industry Sustainable development

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Driving Cost Reduction in CCUS Projects: Innovating Qualification Technologies to Replace Expensive CRA with Cost-Efficient Glass Fiber Polymer Composites

Driving Cost Reduction in CCUS Projects: Innovating Qualific...

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Offshore technology Conference, OTC 2025

作者： Zhao, L. Dunne, T. Ren, J.X. Li, W.H. Cheng, P. CNPC USA HoustonTX United States CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781959025610

The imperative role of Carbon Capture, Utilization, and Storage (CCUS) in achieving the global carbon emissions reduction target of 15-20% by 2050 is widely recognized. However, the sluggish progress in CCUS deployment stems primarily from substantial initial capital outlays, notably attributed to the use of costly Corrosion-Resistant Alloys (CRA). These alloys are essential due to the corrosion challenges posed by supercritical CO2 from the capture facility to the injection wells. Glass Fiber Reinforced Polymer Composite (GFPC), with its high corrosion resistance and excellent mechanical strength, emerges as a costefficient alternative to CRAs. Despite this potential, GFPC faces challenges related to limited data, poor understanding of degradation mechanisms, especially in supercritical CO2, and difficulties in evaluating its operational lifespan. To expedite the adoption of GFPC, this study systematically investigates the degradation mechanisms of GFPC in CCUS injection wells and introduces an industry-crucial model for qualifying GFPC grades for long-term usage as downhole liners. Conventional GFPC tubular qualification methods involve excessively long aging tests (e.g., 417 days as per ISO 14692) with overly conservative safety margins, making qualification cost- and time-prohibitive. To overcome this challenge, a mature GFPC grade with over 50 years of field deployment data was chosen, and a novel accelerated lab testing method (completed in 56 days) was established by plotting mechanical property decay as a function of time at temperatures below its glass transition temperature. Systematic investigations, employing various characterization tools, were conducted to analyze microstructure changes, polymer/fiber bond alterations, and thermomechanical property variations. A numeric degradation model was developed by correlating lab test results with long-term field data to provide a reasonable evaluation of the long-term application of GFPC as liner materials in s

关键词： Corrosion resistant alloys

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Analysis of Hydraulic Fracture Network Morphology in Stimulated Coal Reservoirs with Pre-Existing Natural Fractures

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Energy engineering 2025年第4期122卷 1491-1509页

作者： Weiping Ouyang Luoyi Huang Jinghua Liu Hongzhong Zhang National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields CNPC Chuanqing Drilling Engineering Company LimitedXi’an710018China Changqing Downhole Technology Company CNPC Chuanqing Drilling Engineering Company LimitedXi’an710018China School of Petroleum Engineering Yangtze UniversityWuhan430100China

Hydraulic fracturing is a crucial technique for efficient development of coal *** rocks typically contain a high density of natural fractures,which serve as conduits for fracturing *** injection,the fluid infiltrates these natural fractures and leaks out,resulting in complex fracture *** prediction of hydraulic fracture network propagation for coal reservoirs has important practical significance for evaluating hydraulic *** study proposes a novel inversion method for predicting fracture networks in coal reservoirs,explicitly considering the distribution of natural *** method incorporates three distinct natural fracture opening modes and employs a fractal probability function to constrain fracture *** on thismethod,the study compares hydraulic fracture networkmorphologies in coal reservoirs with andwithout the presence of natural *** showthatwhile both reservoir types exhibitmulti-branch fracture networks,reservoirs containing natural fractures demonstrate greater branching and a larger stimulated reservoir volume(SRV).Additionally,the study employs a fractal dimension calculation method to quantitatively describe the geometric distribution characteristics of *** analysis reveals that the geometry and distribution of natural fractures,as well as reservoir geological parameters,significantly influence the fracture networkmorphology and fractal *** contact angle between natural and hydraulic fractures affects propagation direction;specifically,when the contact angle isπ/2,the fractal dimension of the hydraulic fracture network is ***,smaller lengths and spacings of natural fracture led to higher fractal dimensions,which can significantly increase the *** proposed method offers an effective tool for evaluating the hydraulic fracturing of coal reservoirs.

关键词： Coal reservoirs hydraulic fracturing natural fractures inversion and evaluation fracturing fluid flow fractal dimension

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