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Tight oil reservoirs production simulation with consideration of stress induced permeability evolution 5

Tight oil reservoirs production simulation with consideratio...

5th ISrM Young Scholars' Symposium on rock Mechanics and International Symposium on rock engineering for Innovative Future, YSrM 2019

作者： Yang, Shuai Jin, Yan Li, Mu Chen, Beibei Wei, Shiming Wang, Shiyong China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited. Beijing China Xinjiang Oilfield Corporation Beijing China

ISBN: (纸本)9784907430047

Effective stress state has great influence on permeability of tight oil reservoirs, which is one of the most important properties to evaluate a reservoir. We present a fully coupled poro-elastic finite element production prediction model with consideration of stress induced permeability evolution of tight oil sandstones. Based on deformation and failure modes of tight oil sandstones, stress induced permeability evolution model was considered as three types under different stress states and described independently. Using finite element method based on the poro-elastic theory and stress induced permeability evolution model included, we can get the production prediction. The accuracy of the model is verified using some wells’ production data. The objectives of this study are to find an appropriate numerical model to simulate the production of tight oil reservoirs. It is essential for the successful planning and management of oil and gas reservoirs. © 2019 Japanese Society for rock Mechanics,

关键词： Sandstone

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Case study: Fault slip induced by hydraulic fracturing and risk assessment of casing deformation in the Sichuan Basin

Case study: Fault slip induced by hydraulic fracturing and r...

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SPE/AAPG/SEG Asia Pacific Unconventional resources technology Conference 2019, APUr 2019

作者： Chen, Zhaowei Fan, Yu Huang, rui Zeng, Bo Walsh, rall Zhou, Xiaojin Zoback, Mark Song, Yi CNPC Engineering Technology R and D Company Limited China Petro China Southwest Oil and Gas Field Company China CNPC Engineering Technology R and D Company Limited China University of Petroleum Beijing China Decision Geomechanics LLC Stanford University United States

ISBN: (纸本)9781613996737

Taking the X pad of shale gas in Sichuan Basin as the research object, we observe casing deformation, identify faults, establish a geomechanical model, and analyze the slip probability of faults. The correlational analysis between the positions of the casing deformation and ant tracking faults and microseismic events shows that the fault slip induced by hydraulic fracturing might be the cause of casing deformation. Based on the geological structure of the block, a total of 30 faults are interpreted. The faults were identified mainly by ant tracking and microseismic data. Conventional logs, image logs and mini-fracturing data were analyzed to establish the geomechanical model. The Mohr-Coulomb criterion was used to analyze the activation states of these faults, and the Quantitative risk Analysis (QrA) method was used to analyze the risk of fault slip and sensitivity of fault slip to each factor. The results show that most of the faults in this block are in a critical stress state under the in-situ conditions, and the well-oriented faults can easily be activated under current pumping pressure. After a pressure increase of 2500 PSI, the lowest slip probability of the faults intersecting the casing deformation section reaches 65%, which shows that the casing deformation can be caused by fault slip. Sensitivity analysis shows that the results are most sensitive to pore pressure and friction. Based on the risk assessment, the chance of fault slip can be calculated, which provides a reference for guiding drilling design. Hence method may provide an effective method for mitigating casing deformation problems. © 2019, Unconventional resources technology Conference (UrTeC).

关键词： Fault slips

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Segmentation methods for x-ray computer tomography images of oil sands 5

Segmentation methods for x-ray computer tomography images of...

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5th ISrM Young Scholars' Symposium on rock Mechanics and International Symposium on rock engineering for Innovative Future, YSrM 2019

作者： Pang, Huiwen Jin, Yan dong, Jingnan Gao, Yanfang Wang, Hanqing Wang, Zhenyu State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing102249 China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9784907430047

X-ray computer tomography scanning (X-ray CT) has been adopted for investigating rock’s microstructure, which could characterize sample’s inner pore structure non-destructively. Image segmentation is the first step towards pore space identification. Segmentation of a porous media means conversion of gray scale CT volumes into different regions that permits quantitative characterization. Macroscopic properties of the segmented image can vary greatly with different segmentation methods. In general, CT images of rock and soil samples are required to convert into binary images of particles and pores. X-ray computer tomography technique could also be used for visualizing the specific bitumen-pore-grain structure of oil sands. Segmentation of oil sands refers to the process of partitioning the image into three regions of void, grains and bitumen. At present, the applicability investigation of various segmentation methods for oil sands seems to lag. In this study, four methods for identifying bitumen and pore regions from 2d oil sands Micro CT scan images are compared. Image information entropy is used as a weight to calculate the average porosity of the sample. Image-derived porosity obtained according to the segmentation are given in this paper. Several technical issues of image preprocessing of CT images of oil sands are discussed, and the porosity and bitumen content derived from image applied the segmentation methods are compared to the laboratory measurement of oil sands cores. The research presented is the foundation of quantitative pore space analysis and hydraulic modeling of oil sands based on digital cores. © 2019 Japanese Society for rock Mechanics,

关键词： Image segmentation

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Experimental investigation on mechanical properties of glutenite from Mahu Sag, Junggar Basin, China 5

Experimental investigation on mechanical properties of glute...

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5th ISrM Young Scholars' Symposium on rock Mechanics and International Symposium on rock engineering for Innovative Future, YSrM 2019

作者： Zhao, Fei Pang, Huiwen Wang, Haige Cui, Meng CNPC Engineering Technology R&D Company Limited Beijing China State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum Beijing102249 China

ISBN: (纸本)9784907430047

Glutenite, one of the most important petroleum reservoir rock in the Mahu Sag, is hard to break owing to its high heterogeneity, high abrasiveness and poor drill ability, and this has been a technical problem in petroleum engineering. As rock mechanics is the main factor affecting the breaking rock efficiency, the effect of external loading condition on the rock properties of glutenite need to be investigated. Up to date, there has been experimental research work on rock mechanics of the marine-deposit glutenite, but the counterpart research on continent-deposit glutenite is left undone. In this regard, the object of this study is to explore mechanical characteristics, of continent-deposit glutenite by performing laboratory experiments. This study first discusses the strength of glutenite by triaxial compression tests under monotonic loading. Based on the results, rock mechanics properties (elastic modulus, internal friction angle, compressive strength and failure mode) are obtained. Then, a series of laboratory testing has been performed to assess the effects of cyclic loading and unloading response. Although the deformation characteristics and failure mechanism under cyclic loading are related to the monotonic loading, there is a significant difference between the two cases. Moreover, the influences of number of cycles, amplitude, and frequency are taken into account. results from the cyclic loading tests indicate that glutenite has a "threshold value" of amplitude and an optimal frequency. Glutenite samples are weaker as the number of cycles increases. This work is significantly important for the breaking rock efficiency enhancement of bit during drilling in glutenite reservior. It’s the theoretical basis of putting forward bit and tool design method in the future. ©2019 Japanese Society for rock Mechanics,

关键词： Efficiency

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Well integrity analysis of injection wells during CO2 sequestration, Tarim Basin, China

Well integrity analysis of injection wells during CO2 seques...

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Carbon Management technology Conference 2019, CMTC 2019

作者： Zhang, Jingtian Guo, Qingfeng Mu, Lingyu Cai, Zhixiang Li, Mu Li, Yan CNPC Engineering Technology R and D Company Limited Beijing China Beijing China Petrochina Tarim Oilfield Company Xinjiang China

ISBN: (纸本)9781613997246

Tarim Basin is the biggest oil and gas bearing basin in China. The ultra-deep formations in the North Border of Tarim Basin is characterized by ultra-high temperature, high pressure, and ultra-thick composite salt-gypsum formations, are widely distributed, so it will bring great challenge to well integrity during CO2 sequestration. Therefore it is necessary to evaluate the impact of temperature decrease and salt rock creep on injection well integrity. A numerical model is used to analyze the impact of temperature decrease and salt rock creep on injection well integrity in this process of CO2 injection and obtain a critical temperature drop value.A set of new ideas for casing selection was proposed based upon long-term corrosion rate of different materials calculated by de. Warrd corrosion prediction model. Well B in Tarim Oilfield was designed in this method, and design results were verified by performing laboratory experiments. The results show that under some circumstances the micro-annulus between casing and cement sheath can be changed by salt creep or self-healed. The mechanism of casing damage in salt layers was preliminarily revealed. A set of methods is proposed for casing material selection in CO2 corrosion environment is proposed: corrosion rate of different materials is calculated and converted into long-term corrosion rate. Then the maximum allowable wear extent of the casing is calculated according to casing strength requirement. Finally, casing selection material is determined. The mechanism of casing damage in salt layers was preliminarily revealed during CO2 sequestration. It is indicated that casing damage is mainly caused by the non-uniform load induced by the creep of salt-gypsum layers, the low temperature ,and the poor cementing quality. This new method can effectively reduce cost of casing material selection and make for guaranteeing oilfield development and CO2 sequestration while maintaining wellbore integrity and controllable well control sa

关键词： Carbon dioxide

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Study on Influence of Mechanical Parameters of Cement Plug on Sealing Integrity of Abandoned Wellbore

Study on Influence of Mechanical Parameters of Cement Plug o...

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作者： Jiang, Jiwei Li, Jun Nie, Jiejing Liu, Gonghui Huang, Tao Li, Wai China University of Petroleum-Beijing Beijing102249 China Beijing Petroleum Machinery Co. Ltd. CNPC Engineering Technology R&D Co. Ltd. Beijing102206 China The University of Western Australia CrawleyWA6009 Australia

With the continuous exploitation of oil and gas resources, more and more closed offshore oil and gas wells, no oil or gas showed wells and carbon dioxide wells which have no industrial value are facing disposal. Blocking and abandoning operations mainly involve sealing the wellbore through injecting cement plugs into appropriate layers in it preventing the form of fluid turbulence from crossflowing in the wellbore. The key guarantee of the sealing integrity of the wellbore is ensuring the cement plug in the wellbore can’t be destroyed. According to the basic theory of elastic-plastic mechanics, the cement plug-casing-cement sheath-formation combination model was established. The reliability of the model is verified through the utilizing of the finite element method to calculate the sealing capacity of cement plug under different pressure difference, which is consistent with Nagelhout’s experimental results. The effects of the elastic modulus, Poisson’s ratio and thermal expansion coefficient of the cement plug on the integrity of the cement plug seal were analyzed. The results show that the lower the elastic modulus, the lower the risk of cement plug failure;and the Poisson’s ratio has little effect on the cement plug integrity;when the thermal expansion coefficient of the cement plug is less than the thermal expansion coefficient of the stratum, the cement plug is prone to sealing failure;When The coefficient of thermal expansion is greater than the coefficient of thermal expansion of the stratum formation, the possibility of sealing failure of the cement plug is small. According to the construction conditions on site, properly reducing the elastic modulus of the cement plug, and trying to use cement plugs with large thermal expansion coefficient can help cut the possibility of cement plug sealing failure risk down. The established finite element model and the research results can provide reference for the design of cement plugs during the process of wellbore dispo

关键词： Elastic moduli

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A new method to detect influx and loss during drilling based on machine learning

A new method to detect influx and loss during drilling based...

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International Petroleum technology Conference 2019, IPTC 2019

作者： Shi, Xiaoyan Zhou, Yingcao Zhao, Qing Jiang, Hongwei Zhao, Liping Liu, Yong Yang, Guang CNPC Engineering Technology R and D Co. Ltd China Petro China Tarim Oilfield Company China

ISBN: (纸本)9781613996195

Influx and loss are the two most common downhole complexities. They not only cause the reservoir damage, increase the exploration cost, reduce the drilling efficiency;but also induce major malignancy. Therefore accurate and early detection of influx and loss during drilling is of great significance. Traditional influx and loss detection methods have the shortcoming of monitoring time lagging and high costs. As the rapid development of artificial intelligence techniques, researchers start to detect influx and loss using artificial intelligence method. This work adopted two machine learning algorithms(random forests and Support vector machine) according to their characteristics to detect influx and loss during drilling in real-time. The detection methods includes four steps: 1) Generating raw influx/loss raw data set by combining real-time drilling data and drilling history data;2) Pre-processing raw data set to obtain training data set;3) Training classification model of random forests and SVM by training data set and algorithms;4) Predicting influx/ loss by the trained model according to the new real-time data. The case study shows that influx and loss can be detected accurately in early stage by both random forests method and SVM method after proper pre-processing the raw data and optimizing algorithm parameters. The detection accuracy of the sample data from four wells exceeds 90%. This work demonstrate a new way to detect influx and loss by utilizing huge drilling data and machine-learning algorithms, and the detection results are satisfying. © 2019, International Petroleum technology Conference

关键词： Support vector machines

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Preparation of Ultra-High Molecular Weight Polypropylene Using Ziegler-Natta Catalyst via Combining Internal Electron donor and Cocatalyst Loading

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China Petroleum Processing & Petrochemical technology 2021年第3期23卷 12-22页

作者： Xia Xiaoqi Li Hongming Li Chunman Miao Qing Li Jing Zhu Feng Huang Qigu Yi Jianjun Zhao Zhong State Key Laboratory of Chemical Resource Engineering Key Laboratory of Carbon Fiber and Functional PolymersMinistry of Educationthe College of Material Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029 Petrochemical Research Institute PetroChinaBeijing 102206 CNPC Key Laboratory of Oil&Gas Storage and Transportation PetroChina Pipeline R&D Center

due to the development of the new energy industry,polypropylene with ultra-high molecular weight plays a crucial role for battery isolation *** work investigated the effect of internal electron donor of Ziegler-Natta catalyst system on the molecular weight of the obtained *** scanning electron microscope(SEM)and Canon camera were used to characterize the surface morphologies of catalyst particles and polymer particles,*** with the polypropylene particles featuring a spherical shape,these study results confirmed that the morphology duplication theory from the catalyst particle to the morphology of polymer particle was *** gel permeation chromatography(GPC)results revealed that the obtained polypropylene has a much higher average molecular weight than those prepared by conventional *** Fourier transform infrared spectrometry(FT-Ir)and X-ray photoelectron spectroscopy(XPS)revealed that the carbonyl oxygen atom on ester group was preferentially bound to Mg and Ti,as compared to the ether oxygen *** XPS results showed that the ratio of Ti^(3+)/Ti^(4+)could be changed by internal electron *** Ti3+content was nearly 99%in the Ziegler-Natta catalyst system,isotactic polypropylene with an ultra-high molecular weight of up to 1.42×10^(6)g/mol was obtained by *** result implied that internal electron donor Id3 could reduce theβ-hydride elimination reaction to further increase the molecular weight of the obtained polymer.

关键词： internal electron donor Ziegler-Natta catalyst ultra-high molecular weight isotactic polypropylene

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Study on rock breaking efficiency of special shaped cutters

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IOP Conference Series: Earth and Environmental Science 2022年第1期983卷

作者： Qi Peng Yingcao Zhou Jiaqing Yu Xiongwen Yang Yu Liu Chi Ma Chris Cheng Xiaohua Ke CNPC Engineering Technology R & D Company Limited Beijing China Research Institute of Petroleum Exploration & Development Beijing China CNPC USA Corporation (Houston TX USA)

The optimization of cutter shape has become one of the main innovation direction of PdC bit technology. At present, both domestic and foreign bit manufacturers have put forward various special shaped cutters to improve rock breaking efficiency. However, there are relatively few researches which focus on the rock breaking efficiency of special-shaped cutters. Therefore, three kinds of typical cutters (flat cutter, convex cutter and concave cutter) are selected as the study object in this paper. Based on the single cutter test, the relationship of axial cutting force, cutting area and cutting specific energy under different working conditions will be provided. The experimental results show that the axial cutting force and specific energy of concave cutter and convex cutter are lower than that of flat cutter in most test cases. The results are almost the same for both Vosges sandstone and Marcellus shale cases. In other words, the tested concave cutters are easier to intrude into rock and obtain higher rock brea king efficiency under the same cutting conditions, when compared with flat cutter and convex cutter. The experimental method provides a technica l reference for studying the rock breaking efficiency of three-dimensional cutters with different shapes.

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rIS-Assisted MIMO Channel Measurements and Characteristics Analysis for 6G Wireless Communication Systems

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IEEE Transactions on Vehicular technology 2025年

作者： Sun, Yingzhuo Wang, Cheng-Xiang Xu, Yingjie Xin, Lijian Huang, Jialing Huang, Jie Qin, Qibo Gao, Xinyu Guo, Bolun Cui, Tie Jun Chen, Yunfei Southeast University National Mobile Communications Research Laboratory School of Information Science and Engineering Nanjing211189 China KTH Royal Institute of Technology Division of Information Science and Engineering Sweden Purple Mountain Laboratories Nanjing211111 China Lund University Department of Electrical and Information Technology Lund Sweden Shanghai Huawei Technologies Co. Ltd. Shanghai201718 China Shanghai Huawei Technologies Co. Ltd. Wireless Network RAN Research Department Shanghai201718 China Huawei Technologies Company Ltd. Research Department of Beijing R&D Subdivision Wireless Network Beijing100085 China Southeast University State Key Laboratory of Millimeter Wave School of Information Science and Engineering Nanjing211189 China University of Durham Department of Engineering DurhamOHI 3LE United Kingdom

reconfigurable intelligent surface (rIS) can manipulate the electromagnetic (EM) waves in wireless channels and thus is promising for the sixth generation wireless communication systems. However, there exists little research on rIS channel measurements, which are important for the communication system design. In this paper, channel measurements are carried out in anechoic chamber, outdoor, and indoor environments. For anechoic chamber measurements, the insertion loss, EM response reciprocity, and received power are analyzed. It is found that rIS can fulfill EM response reciprocity. It is also found that the performance of rIS beamforming in the coplane configuration is better than that in the non-coplane configuration. In outdoor measurements, the cumulative distribution functions of large-scale parameters (LSPs) are obtained to explore the relationship between LSPs and heights. results show that the rIS-user equipment channel is more sensitive to the height variation than the base station-rIS channel. For indoor measurements, the angular power spectral density, spatial cross-correlation function, and channel capacity are investigated. It is found that rIS with near-field coding and a larger size can bring a higher gain than rIS with far-field coding and a smaller size. The normalized power and code differences between near-field and far-field coding are defined to verify the rIS rayleigh distance. It can be found that the value of the theoretical rIS rayleigh distance is almost the same as the distance where the defined normalized differences become zero. © 2025 IEEE.

关键词： Mobile telecommunication systems

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