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Chinese Materials Conference 2022-2023

作者： Xu, P. Xia, X.J. Jin, J.Z. Yu, Y.J. Zhang, J.Y. Zhang, H.Z. CNPC Engineering Technology R and D Company Limited Beijing China

Conventional filtration reducers have limited utility in cementing at deep oil and gas fields because of their poor temperature resistance and single function. As a novel multifunctional filtration reducer, graphene oxide-modified polymer GO-PAdI was developed by radically copolymerizing 2-acrylamido-2-methylpropane sulfonic acid (AMPS), N, N-dimethyl acrylamide (dMAM) and itaconic acid (IA) between graphene oxide sheets. The microstructure of GO-PAdI was confirmed through the utilization of different methods such as fourier transform infrared spectroscopy (FT-Ir). The performance evaluation results showed that GO-PAdI had the high thermal stability, and could control filtration of cement slurry as conducted by the American Petroleum Institute (API) less than 50 mL, which is 17 % lower than that of the traditional filtration reducer PAdI. GO-PAdI could increase compressive strength of cement stone by 30.3 %, and decrease elastic modulus by 10.9 % in three-day curing period. GO-PAdI has the multifunctional functions of reducing fluid loss, strengthening and toughening, and can effectively improve the engineering performances for high-temperature cement slurry. © Published under licence by IOP Publishing Ltd.

关键词： Gas industry

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development of Intelligent drill Pipe for Power Supply and Communication 12th

Development of Intelligent Drill Pipe for Power Supply and C...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Han, Fei Wang, Ai-Guo Hu, Zhi-Jian Wang, Hong-Wei Qiao, Han CNPC Engineering Technology R and D Company Limited Beijing China

ISBN: (纸本)9789819919635

Power supply and communication intelligent drill pipe is a bridge to realize high-speed two-way information communication and power transmission between ground and underground. In order to realize intelligent electrification and informatization of drilling, the ground and underground cables are connected by the way of built-in cableâ€‰+â€‰wet joint in the water hole of conventional drill pipe, and the two-way coupling transmission of power and communication signals is realized through power wave carrier and downhole adapter. Through the simulation and optimization design of key components such as wet joint and the testing of sealing, insulation and signal communication performance of drill pipe system, an intelligent drill pipe for power supply and communication is developed. The tool adopts contact power supply and communication mode, and the performance of 3000 m non relay communication and sealing and insulation reliability in severe water immersion environment have been verified. The tool has been tested in real drilling. The 150 m long wet joint cable only brings about 3 dB attenuation of carrier signal, and the power supply and communication performance are reliable. The development of this drill pipe is of great significance to promote the construction of Intelligent Long-distance non relay high-speed two-way communication channel for drilling automation and the development of accurate control of drilling tool electrification. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： drills

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development and performance evaluation of a high temperature resistant, internal rigid, and external flexible plugging agent for water-based drilling fluids

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Petroleum 2023年第1期9卷 33-40页

作者： Zhe Xu Jinsheng Sun Li Li Kaihe Lv Jingping Liu Zhiwen dai Xianfa Zhang Zonglun Wang School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

during the drilling process for oil and gas production,a larger number of drilling fluids invade the formation,causing severe formation damage and wellbore collapsing,which seriously hinders the efficient production of deep oil and *** several plugging agents have been developed for efficient fracture sealing in recent years,the development of high-performance plugging agents with self-adaptive ability and high-temperature resistance remain a ***,we report the synthesis of an internal rigid and external flexible plugging agent PANS by reversed-phase emulsion polymerization with nano-silica as the rigid core and poly(acrylamide-co-N-vinylpyrrolidone)as a flexible *** plugging agent has a median particle size of 10.5μm and can self-adapt to seal the microfractures and fractures in the formation,leading to an effective reduction in the filtration loss of bentonite water-based drilling fluid under both low temperature and low pressure(LTLP)and high temperature and high pressure(HTHP)*** addition,compared with the neat nano-silica(500 nm),the sealing efficiency of PANS toward 100–120 mesh sand bed was increased by 71.4%after hot rolling at 180°C.

关键词： Internal rigidity External flexibility Plugging agent Filter loss reduction Plugging performance

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Experimental study on durability fracture behavior and vibration modal sweep for vehicle rear axle

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Journal of Beijing Institute of technology 2013年第2期22卷 207-212页

作者：门玉琢于海波霍娜 School of Mechatronics Engineering Changchun Institute of Technology China FAW Company Limited R&D Center

In order to study the fatigue fracture behavior of the rear axle of certain China-made car, the strain loading spectrum near the rear axle fracture location is collected, the modified Neuber rule and the cyclic stress-strain hysteresis loop curve equation are used to convert the nominal strain his- tory into the local stress-strain response. The impact of mean stress on fatigue damage is corrected according to the Manson-Coffin model, and programming calculation of the fatigue damage of the fracture crack is conducted in the INFIELd software, the electromagnetic vibrators are used to sweep the vibration modal frequencies of the rear axle and car body. The enhancement test and fre- quency sweep results show that the rear axle fatigue damage mainly concentrates on the washboard road, and when the forced vibration excitation frequency is 24. 07 Hz, the vibration modal frequency of the rear axle is close to the excitation frequency of the washboard road, leading to resonance and making the rear axle subjected to large strain and fatigue damage, and then vibration fatigue fracture due to high stress concentration.

关键词： fatigue damage durability fracture vibration sweep loading spectrum forced vibra- tion

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Application status and prospect of ionic liquids in oilfield chemistry

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Petroleum 2024年第1期10卷 11-18页

作者： Jinsheng Sun Zhuoyang Xiu Li Li Kaihe Lv Xianfa Zhang Zonglun Wang Zhiwen dai Zhe Xu Ning Huang Jingping Liu School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580China CNPC Engineering Technology R&D Company Limited Changping10206China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an710000China

The ionic liquid,as a new treatment agent,has been increasingly applied in oil fields due to its strong temperature resistance,good solubility and high surface *** this paper,we systematically discuss the action mechanism and application effect of ionic liquids in oilfield *** liquids can inhibit shale hydration expansion and reduce fluid loss through adsorption and intercalation,inhibit the formation of natural gas hydrate through imidazole five-membered ring structure as a space barrier,reduce viscosity of heavy oil by breaking chemical bonds of heavy oil macromolecules and charge transfer,improve oil displacement efficiency by forming ions pairs with carboxyl groups in crude oil,demulsify by forming channels between dispersed water droplets,acidify the formation by reacting with water to produce acid,interacts with organic material through weak hydrogen bonds and extracts it from oilfield wastewater,desulphurize by inserting sulfide molecules into the“stack”structure and form liquid inclusion complex,inhibit corrosion by forming a protective film on the metal *** on the above aspects,the development direction of ionic liquids is *** application of ionic liquids in oilfield chemistry is still in its *** is urgent to fully explore the application performance of ionic liquids in oilfield chemistry,which also provides theoretical and technical supports for efficient reservoir development.

关键词： Ionic liquids Oilfield chemistry Shale inhibitor drilling fluid

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Flow assurance in deep-water gas pipelines: Locating hydrate plugging position in a fast way

Flow assurance in deep-water gas pipelines: Locating hydrate...

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SPE/IATMI Asia Pacific Oil and Gas Conference and Exhibition 2021, APOG 2021

作者： Yu, Jing Hui, Cheng Sun, Chao Wen Zou, Zhan Ling Zhuo, Bin Lu Chang, Long Liu, Li Wang, Yuan Zhi Zhang, Bo Jian CNPC Engineering Technology R&D Company Limited College of Petroleum Engineering China U. of Petroleum China

ISBN: (纸本)9781613997833

Hydrate-associated issues are of great significance to the oil and gas sector when advancing the development of offshore reservoir. Gas hydrate is easy to form under the condition featuring depressed temperature and elevated pressure within deep-water gas pipeline. Once hydrate deposition is formed within the pipelines, the energy transmission efficiency will be greatly reduced. An accurate prediction of hydrate-obstruction-development behavior will assist flow-assurance engineers to cultivate resource-conserving and environment-friendly strategies for managing hydrate. Based on the long-distance transportation characteristics of deep-water gas pipeline, a quantitative prediction method is expected to explain the hydrate-obstruction-formation behavior in deep-water gas pipeline throughout the production of deep-water gas well. Through a deep analysis of the features of hydrate shaping and precipitation at various locations inside the system, the advised method can quantitatively foresee the dangerous position and intensity of hydrate obstruction. The time from the start of production to the dramatic change of pressure drop brought about by the deposition of hydrate attached to the pipe wall is defined as the Hydrate Plugging Alarm Window (HPAW), which provides guidance for the subsequent hydrate treatment. Case study of deep-water gas pipeline constructed in the South China Sea is performed with the advised method. The simulation outcomes show that hydrates shape and deposit along pipe wall, constructing an endlessly and inconsistently developing hydrate layer, which restricts the pipe, raises the pressure drop, and ultimately leads to obstruction. At the area of 700m-3200m away from the pipeline inlet, the hydrate layer develops all the more swiftly, which points to the region of high risk of obstruction. As the gas-flow rate increases, the period needed for the system to shape hydrate obstruction becomes less. The narrower the internal diameter of the pipeline is,

关键词： drops

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Study on Fracture Propagation in Tight Sandstone by Large-Scale Physical Simulation Experiments 12th

Study on Fracture Propagation in Tight Sandstone by Large-Sc...

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12th International Field Exploration and development Conference, IFEdC 2022

作者： Li, Jia-Ying Qi, Chun-Yan Wu, Bo-Hong Gu, Ye Zhou, Tuo CNPC Engineering Technology R&D Company Limited Beijing China CNPC Research Institute of Petroleum Exploration and Development Beijing China

ISBN: (纸本)9789819919635

Physical simulation experiment on hydraulic fracturing is an effective and reliablemethod to understand the initiation and propagation of hydraulic fractures. However, shale and cement samples are mostly used in current experiments, while tight sandstone is seldom studied. Besides, the experiments are usually conducted with single-stage fracturing, ignoring the interaction between fractures in the actual fracturing. In this paper, a pioneer large-scale physical simulation experiment is conducted by multi-stage hydraulic fracturing to reveal the initiation and propagation of fracture in tight sandstone. Two groups of tight sandstone samples were prepared as the size of 28 × 28 ×36,where four circular notches were designed on the wellbore to represent fracturing clusters. The tests were performed by a large block polyaxial stress frame and the acoustic emissions data were observed to indicate the features of fracture complexity. Consequently, the effects of hydraulic fracture interaction, pumping rate and rate pulsing on fracture propagation were studied. The results showed that the simple fractures were mainly formed in tight sandstone, while the complex fractures were rarely formed since the mutual inhibition between fractures under stress shadow. The fracture initiation and breakdown pressures increase gradually with the pump rate, while the rate change has no significant effect on the fracture radius. The rate pumping can effectively increase fracture complexity, further improving the effect of reservoir stimulation. This work successfully reveals the effects of different factors on fracture initiation and propagation, offers an innovative method of physical simulation experiment on hydraulic fracturing, and provides a significant reference for fracturing design optimization of tight sandstone. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2023.

关键词： Fracture

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research on the recognition and Characterization of Fractures in Coal rock Based on CT Scanning

Research on the Recognition and Characterization of Fracture...

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International Petroleum and Petrochemical technology Conference 2024, IPPTC 2024

作者： Ye, Zhilin Qu, Shiyuan Liu, Jianquan Gao, Xiang Jin, Yi CNPC Engineering Technology R&D Company Limited China Research Institute of Petroleum Exploration and Development China

Coal rock fractures play a vital role as key channels for gas migration and storage in the exploration and development of coalbed methane. The characteristics of these fractures, such as porosity distribution, specific surface area, and connectivity, directly impact the adsorption, diffusion, and permeability behaviors of coal reservoirs. Therefore, a detailed analysis of coal rock fracture characteristics is vital in assessing the extractability of coalbed methane and during its exploration and development process. Currently, techniques like imaging logging, seismic detection, and micro-CT are employed for characterizing and studying fractures at various scales. Among these, high-resolution non-destructive CT scanning technology, by constructing three-dimensional data models of core samples, enables a quantitative analysis of fracture distribution features and size parameters. Traditional digital image processing methods, such as threshold segmentation and binary segmentation, though advantageous in computational speed, have limitations in the accuracy of fracture identification. With the advancement of artificial intelligence technology, deep learning-based image processing techniques have increasingly become significant tools for fracture detection due to their powerful feature extraction capabilities. This study conducted micrometer-level CT scanning experiments on coal rock samples, using CT image processing technology to construct a digitalized coal rock core model. deep learning methods were applied for precise fracture identification, establishing an appropriate deep learning architecture and optimized parameters for coal rock fracture recognition. Furthermore, this paper provides a detailed quantitative characterization of the precisely identified fractures, offering robust technical support for the exploration and development of coalbed methane. The high-resolution nondestructive CT scanning technology and three-dimensional fracture network reconstruction

关键词： Computerized tomography

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research of drilling and completion technologies for heavy oil in Venezuela and offshore presalt hydrocarbons in Brazil

Research of drilling and completion technologies for heavy o...

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SPE Middle East Oil and Gas Show and Conference 2019, MEOS 2019

作者： Fang, Zhimeng Wang, Xi Fu, Jin Zhang, Shunyuan Chen, Chen Research Institute of Petroleum Exploration & Development CNPC Engineering Technology R&D Company Ltd. China CNPC Engineering Technology R&D Company Ltd China

ISBN: (纸本)9781613996393

Located in south of Eastern Venezuela Basin, Orinoco Oilfield is an onshore heavy oil field in South America. The heavy oil is known for its high content of acids, heavy metals and asphaltenes with a viscosity of 1000-10000mPa·s. According to the reserve report released by PdVSA by the end of 2016, JUNIN Block that is situated in east of Orinoco Oilfield has an OOIP of 178*108bbl. data of drilled wells and distances between offset horizontal intervals in Orinoco were both studied to improve ultimate production rates. 3-dimension borehole trajectories were designed and the most effective anti-collision measures were taken. After optimziation 8-12 horizontal wells are distributed on one pad. As the horizontal interval extends, the stable production time is prolonged and the accumulative production per well improves. However, the recovery rate stops increasing when the horizontal interval is over 1600m in JUNIN Block. Economically a large space between offset horizontal intervals results in fewer wells and lower costs, but a smaller space contributes to a higher production efficiency per well. If the space exceeds 600m, the accumulative production rate increases much more slightly. A three-dimension well trajectory consists of a vertical interval, an angle building interval, an angle holding interval, an angle building & direction changing interval, a direction turning interval as well as an absolute horizontal interval. Since Petrobras developed the first ever offshore deep reservoir (Lula) by scale in 2006, Brazil has been conducting a progressive campaign targeting hydrocarbons buried under deep water, which contributes to discovery of Lula, Carioca, Jupiter, Buzios, Libra and other giant presalt reservoirs in Santos Basin after Campos Basin, where there are 9 oil fields ranking among the top 20 offshore oil fields in terms of OOIP. By June 2017 over 160×104bbl oil and gas were produced per day in deep water of Santos Basin, taking up 57.1% of the total yield of Cam

关键词： Lime

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Feasibility Evaluation of rF Heating Heavy Oil reservoir Based on the Interaction Between rocks and Electromagnetic Waves 58

Feasibility Evaluation of RF Heating Heavy Oil Reservoir Bas...

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58th US rock Mechanics / Geomechanics Symposium 2024, ArMA 2024

作者： Wang, Zhengxu Guo, Qingfeng Cai, Xiao Zhang, Jingtian Zhao, Qing Li, Bo Chen, Xuefeng Gao, Haiyang CNPC Engineering Technology R&D Company Limited Beijing China PetroChina Tarim Oilfield Company Xinjiang Korla China

ISBN: (纸本)9798331305086

Currently, radio frequency (rF) heating is emerging as an alternative to steam thermal recovery methods, owing to its numerous advantages including cleanliness, environmental friendliness, and cost-effectiveness. Achieving maximum heating distance and temperature during rF heating hinges on understanding the interaction between rF electromagnetic waves and rocks. To address this, the present study elucidates the rF heating mechanism, establishes geometric and mathematical models accounting for rock properties, and validates the mathematical model using laboratory experiments. The calculations reveal that lower specific heat, thermal conductivity, relative permittivity, and density of rocks, coupled with higher rock electrical conductivity, contribute to higher maximum reservoir temperatures. Additionally, the maximum heating distance increases with decreasing specific heat and density of rocks. Optimal values of thermal conductivity, relative permittivity, and electrical conductivity exist, maximizing the heating distance. These findings provide crucial guidance for optimizing rock properties, enhancing maximum heating temperature, and extending heating distances before implementing rF heating technology. Copyright 2024 ArMA, American rock Mechanics Association.

关键词： rock mechanics

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