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Coupling Prediction Model and Influencing Factors Analysis of Injection and Production Gas Flow rate and Wellhead Pressure for Compressed Air Energy Storage in Salt Cavern

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SSrN 2024年

作者： ren, Qianyu Wang, Jiangshuai Fu, Pan School of Energy School of Oil and Gas Engineering Changzhou University China CNPC Engineering Technology R&D Company Limited China National Engineering Research Center for Oil & Gas Drilling and Completion Technology China

In order to accurately predict the injection and production gas flow rate and wellhead pressure for compressed air energy storage in salt cavern, a coupled prediction model of injection and production gas flow rate and wellhead pressure based on gas pipe flow theory was established in this paper. And, a high-precision and high-speed iterative solution algorithm was proposed to achieve accurate and rapid prediction of injection and production gas flow rate, wellhead pressure, and total pressure loss. Furthermore, the influences of factors such as cavity connectivity, number of cavities, cavity pressure, depth of injection and production wells, number of injection and production columns, size of injection and production columns, and injection and production medium on injection and production gas flow rate, wellhead pressure, and total pressure loss were discussed. The research results indicate that: ① There are good stability, fast convergence speed, and good consistency between the predicted results and on-site measured data for the model. ② Under the condition that cavity is connected, the total injection production flow rate will be evenly distributed to each injection production well, and the wellhead pressure and total pressure loss of each injection production well are consistent. Under the condition that cavity is not connected, injection production wells with higher cavity pressure have greater injection production gas flow rate and total pressure loss. ③ With the increase in the number of chambers, the decrease in chamber pressure, the increase in injection production well depth, the increase in the number of injection production columns, and the decrease in the size of injection production columns, the single tube injection production gas flow rate decreases. However, the changes in wellhead pressure and total pressure loss are not only influenced by various factors, but also closely related to operating conditions. ④ When other conditions remain unchanged,

关键词： Compressed air

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determination of critical fracturing spacing affecting the simultaneous growth of multiple hydraulic fractures from a horizontal wellbore 57

Determination of critical fracturing spacing affecting the s...

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57th US rock Mechanics/Geomechanics Symposium

作者： Cheng, Shaoyi Wu, Bisheng Han, Yanhui Zhang, Xi Chen, Zhaowei Tan, Peng Yang, Liu State Key Laboratory of Hydroscience and Engineering Department of Hydraulic Engineering Tsinghua University Beijing100084 China Aramco Americas: Aramco Research Center HoustonTX77084 United States Faculty of Engineering China University of Geosciences Wuhan430074 China CNPC Engineering Technology R&D Company Limited Beijing102206 China Beijing100083 China

ISBN: (纸本)9780979497582

The multi-stage hydraulic fracturing and horizontal well have become the most important technologies in extracting oil and gas from unconventional reservoirs. However, the stress shadow effect often hinders the simultaneous growth of multiple fractures when design parameters such as fracture spacing and injection parameters are not set properly. Therefore, one of the key issues in a fracturing treatment is the determination of the fracture spacing within a fracturing stage under different combinations of geomechanical and injection parameters. This paper presents a numerical study by using the in-house code, deepFrac, a fully coupled hydraulic fracturing simulator based on the dual boundary element method and finite volume method. The evolution of the optimal fracture spacing with the geomechanical and injection parameters is investigated. The results demonstrate the dependence of the optimal fracture spacing on the energy dissipation and in-situ stress contrast. A dimensional analysis is carried out, and two dimensionless groups are determined including the dimensionless toughness and dimensionless in-situ stress difference. A critical fracturing spacing is proposed based on the dimensionless groups, which can capture the combined role of different parameters in the fracture growth. The effectiveness of the proposed critical fracturing spacing determination criterion is verified by a few additional numerical experiments. © 2023 57th US rock Mechanics/Geomechanics Symposium. All rights reserved.

关键词： Hydraulic fracturing

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Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

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SSrN 2024年

作者： Zhang, Yuda dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Yuan, Guangjie Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

UGS is the key place to ensure the stable supply of natural gas, and the plugging effect of old wells will be seriously affected due to its characteristics of strong and alternating injection and withdrawal. In order to study the plugging of old wells with fishing and buried by sediment, a full-scale wellbore sediment sealing simulation experiment and a small-scale core permeability experiment were designed. Considering the factors such as sediment composition, compaction degree and metal surface roughness, the compaction law of fillers and the change law of permeability with rock cuttings content under different top hydraulic conditions were analyzed. The experimental results show that there are two kinds of sealing failure in old wells. One is gas breakthrough, the breakthrough pressure difference is 1.3-2.7 MPa, the breakthrough time is about 30 s, and the dominant channel is the interface between sediment and casing and fishing. The other is gas leakage. The permeability range of the sediment is 0.0024-0.031 d, and the reservoir gas flows along the pore channel of the sediment. This study simulates the sediment plugging old wells in the range of gas storage site, and provides reference for the sealing failure process and mechanism of old wells. © 2024, The Authors. All rights reserved.

关键词： Sediments

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Simulation Experiment of Sediment Sealing in Old Well of Underground Gas Storage (Ugs)

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SSrN 2024年

作者： Zhang, Yuda Yuan, Guangjie dong, Jingnan Liu, Tianen Guan, Yueyang Ban, Fansheng Research Institute of Petroleum Exploration & Development PetroChina Beijing100083 China CNPC Engineering Technology R&D Company Limited Beijing102206 China National Engineering Laboratory of Petroleum Drilling Technology Beijing102206 China National Elite Institute of Engineering CNPC Beijing100096 China

关键词： Sediments

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In-situ observation of microcrack initiation and damage nucleation modes on the HAZ of laser-welded dP1180 joint

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Journal of Materials Science & technology 2023年第17期148卷 138-149页

作者： Junliang Xue Wei Guo Jin Yang Mingsheng Xia Guang Zhao Caiwang Tan Zhandong Wan Jiaxuan Chi Hongqiang Zhang School of Mechanical Engineering and Automation Beihang UniversityBeijing100191China School of Materials Engineering Shanghai University of Engineering ScienceShanghai201620China R&D Center TANGSTEEL CompanyHBIS GroupTangshan063016China Shandong Provincial Key Laboratory of Special Welding Technology Harbin Institute of Technology at WeihaiWeihai264209China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China School of Materials Science and Engineering Beihang UniversityBeijing100191China

In-situ SEM can intuitively observe the changes in microstructure and microcrack initiation during the deformation process of the *** this paper,the microstructural evolution,mechanical properties,and damage nucleation modes of dP1180 laser welded joints were systematically discussed by the trans-mission electron microscope(TEM),focused ion beam(FIB),and in-situ tensile *** precipitation of carbides and disappearance of dislocations tangles deteriorated the mechanical properties of tempered martensite in the sub-critical heat affected zone(SCHAZ),which caused its microhardness slightly de-creased(∼27 HV)and also called the softened *** joints fractured in the SCHAZ during the tensile and Erichsen cupping tests and microcracks initiated from the tempered martensite,while the microc-rack initiation of base material(BM)occurred at the ferrite/martensite *** dominant damage nucleation mode of the joint was tempered martensite cracking,and that of BM was ferrite/martensite interface decohesion during tests.

关键词： In-situ tensile test dP steel Laser welded damage nucleation modes

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Mechanical densification synthesis of single-crystalline Ni-rich cathode for high-energy lithium-ion batteries

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Journal of Energy Chemistry 2023年第4期79卷 562-568页

作者： Gwonsik Nam Jaeseong Hwang donghun Kang Sieon Oh Sujong Chae Moonsu Yoon Minseong Ko Division of Convergence Materials Engineering Pukyong National UniversityBusan 48547Republic of Korea Namyang R&D Center Hyundai Motor CompanyHwaseong 18280Republic of Korea Division of Industrial Chemistry and Polymer Engineering Pukyong National UniversityBusan 48547Republic of Korea Department of Nuclear Science and Engineering Massachusetts Institute of TechnologyCambridgeMA 02139USA

The intergranular microcracking in polycrystalline Ni-rich cathode particle is led by anisotropic volume change and stress corrosion along grain boundary,accelerating battery performance ***,we have suggested a simple but advanced solid-state method that ensures both uniform transition metal distribution and single-crystalline morphology for Ni-rich cathode synthesis without sophisticated ***-assisted mechanical densification(PAMd)process on solid-state precursor mixture enables the dynamic mass transfer through the increased solid-solid contact area which facilitates the grain growth during sintering process,readily forming micro-sized single-crystalline ***,the improved chemical reactivity by a combination of capillary effect and vacancyassisted diffusion provides homogeneous element distribution within each primary *** a result,single-crystalline Ni-rich cathode with PAMd process has eliminated a potential evolution of intergranular cracking,thus achieving superior energy retention capability of 85%over 150 cycles compared to polycrystalline Ni-rich particle even after high-pressure calendering process(corresponding to electrode density of~3.6 g cm^(-3))and high cut-off voltage *** work provides a concrete perspective on developing facile synthetic route of micron-sized single-crystalline Ni-rich cathode materials for high energy density lithium-ion batteries(LIBs).

关键词： Lithium-ion batteries Ni-rich cathode materials Mechanical densification Solid-state synthesis

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research on Quantitative Method and Main Control Factors of drilling Crew Operation Effect 13th

Research on Quantitative Method and Main Control Factors of ...

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13th International Field Exploration and development Conference, IFEdC 2023

作者： Xiao, Yue Zhou, Tuo Jing, Ning Li, Hang-Yuan Wang, Gang Liu, Ji-Tong Ye, dong-Qing Zhong, Zhao Li, Bing-rou Jin, Yu-Lai Li, Gan-Lu Li, Jing CNPC Engineering Technology R&D Co. LTD. Beijing China PetroChina International Exploration and Development Co. LTD. Beijing China Beijing China Tianjin Petroleum Vocational and Technical College Tianjin China

ISBN: (纸本)9789819702558

The assessment of drilling crew is crucial for evaluating the operational effectiveness, improving management levels, and improving drilling operation quality and efficiency. Currently, most drilling crew operation evaluation only consider drilling speed and wellbore quality, which cannot fully reflect the overall operational effectiveness of the drilling crew and is not conducive to oilfield enterprises evaluating the operational effectiveness of the drilling crew. Based on sorting statistics and programming calculations methods, and considering the actual drilling site, a multi-level evaluation method for drilling crews was established to quantify the effectiveness of drilling crew operations and provide an evaluation method for multi drilling crew operation projects, considering key indicators such as drilling workload, drilling efficiency, drilling timeliness, wellbore quality control, and diesel consumption, which reflects workload, quality, efficiency, and economy respectively. A method for evaluating the main control factors of drilling operation performance was established based on the grey correlation analysis method, using the drilling crew score as the evaluation indicator for drilling crew operation performance. Taking XX Oilfield as an example, the performance of 8 drilling crews in XX Oilfield in 2020 was quantitatively scored. The analysis results showed that the order of evaluation for XX Oilfield in 2020 was: crew 2 > crew 4 > crew 3 > crew 5 > crew 1 > crew 6 > crew 7 > crew 8. Well quality is the main controlling factor affecting the performance of the drilling crew, and the evaluation results are in line with the actual situation of XX Oilfield. The multi-level drilling crew evaluation method established in this article provides assessment methods for multi-drilling crew operation projects and provides a theoretical basis for the formulation of operation management measures for project companies. © The Author(s), under exclusive license to Spring

关键词： Quality control

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research and application of drilling rig optimization model 8

Research and application of drilling rig optimization model

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8th International Conference on Electrical, Mechanical and Computer engineering, ICEMCE 2024

作者： Xiao, Yue Zhou, Tuo Liu, Guojun Chen, Xuanren Kong, Xiangji Zhang, Yu Liu, Longlong diao, Shunong PetroChina International Exploration and Development Co. Ltd Overseas Drilling and Completion Technology Center Cnpc Engineering Technology R&d Co. Ltd Beijing China PetroChina International Exploration and Development Co. Ltd Beijing China Changchun University of Technology Changchun China Beijing China

ISBN: (纸本)9798331506230

The optimal selection of drilling rigs is crucial for the rational arrangement of drilling rigs in multi operation teams, the improvement of moving operation management level, and the enhancement of drilling operation quality and efficiency. At present, the optimal selection of drilling rigs only considers whether the drilling meets the needs of the drilling project and the moving distance, and cannot comprehensively and scientifically select drilling rigs, which is not conducive to the rational configuration evaluation of oilfield drilling rig operation. This article comprehensively considers key indicators such as drilling efficiency, time efficiency, moving cycle, moving cost, and moving distance, innovatively forms a pentagonal drilling rig optimization coordinate system, establishes drilling rig optimization rate, comprehensive standard deviation, drilling rig optimization comprehensive standard deviation and other indicators, and forms a drilling rig optimization model for drilling. Taking Block B as an example, the priority of Block B with three drilling rigs to be optimized calculated using the model is r1> r2> *** optimal selection rate of drilling r1 is the highest, the comprehensive standard deviation is smaller, and the comprehensive index of the best and more stable drilling performance is the highest, which is 0.0058. Therefore, r1 should be selected for drilling. The drilling rig optimization model proposed in this paper provides a process reference for drilling rig optimization, quantifies various indicators, and provides a theoretical basis for new well drilling rig optimization, project company drilling rig operation plan formulation, and improving project company drilling rig management level. © 2024 IEEE.

关键词： Efficiency

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research on construction and operation parameters of an underground oil storage in depleted salt caverns in the east of China 82

Research on construction and operation parameters of an unde...

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SPE Europec featured at 82nd EAGE Conference and Exhibition, EUrO 2021

作者： Jin, Fu Xi, Wang Mingming, ding Guobin, Yang Shunyuan, Zhang Bingshan, Liu Chen, Chen CNPC Engineering Technology R&D Company Ltd. China China National Oil and Gas Exploration and Development Company Ltd. China

ISBN: (纸本)9781613997918

The crude oil price has been keeping at a low level in recent years, which made China's government put more efforts in the development of underground oil storages in depleted salt caverns. Under the initiative of "the Belt and road", a more concrete concept which is "the Silk road Economic Belt and the 21st-Century Maritime Silk road"successfully connects Jiangsu Province in the east of China. Consisting of 20 depleted caverns, Huai'an project that is still under planning is one of the most successful examples that turn depleted salt caverns into underground crude oil storages in China. Each cavern takes up 24×104m3, while the project totally takes up 480×104m3. TdMA algorithm was adopted to solve the heat exchange model of oil, brine and surrounding rocks, revealing the relationship between temperature and cavern pressure. Salt rock safety factor, salt cavern shrinkage ratio, axial stress and ground subsidence were taken into consideration to establish a 3- dimension salt rock creep model for 19 depleted salt caverns, so that the caverns' shapes were optimized. Hydrodynamics models were used to determine the oil's flow rate into and out of a 1000m deep cavern whose thermal field was simulated by software to reveal the temperature limit of oil and brine. due to geothermal gradient and continuous heat transmission, the average temperature of oil and brine goes up from 35°C to 44.3°C within 7 years, while the inner pressure goes up from 12.96MPa to 21.93MPa in a depleted salt cavern. Salt creep ratio decreases as oil is stored in underground caverns for a longer period. Salt is hardly penetrated by oil, while the temperature change has a strong influence on caverns' internal pressure. The thermal expansion factor and compressibility coefficient of crude oil and brine are both crucial to the temperature's effect on internal pressure. Caverns that have larger segments in their uppermiddle or middle parts are more stable and resistant to salt creep than those that have l

关键词： Crude oil

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Crosstalk analysis of twisted bundle of twisted wire pairs (TBTWPs) and star-quad cables under the effect of inner and outer excitations

Crosstalk analysis of twisted bundle of twisted wire pairs (...

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作者： Su, Zhizhen Gassab, Oussama Zhang, Jingwei Chen, Yanning Shao, Yali He, Fang He, Fangmin Meng, Jin Zhou, Guohua Hong, Zehong Zhao, dongyan Yin, Wen-Yan Innovative Institute of Electromagnetic Information and Electronic Engineering College of Information and Electronic Engineering Zhejiang University Zhejiang China Beijing Smart-Chip Microelectronics Technology Company Ltd.1 Beijing China The R&D Laboratory Zhejiang Zhaolong Interconnect Technology Company Ltd. Huzhou China Naval University of Engineering Hubei Wuhan China

In this article, deep neural network (dNN) and chain parameter methods are used to analyze the crosstalk coupling of a star-quad and a twisted bundle of twisted wire pairs (TBTWP) cables for different excitations, respectively. A dNN is used to extract the per-unit-length (p.u.l) resistance, inductance, capacitance, and conductance (rLCG) parameters at any position for the star-quad and TBTWP cables. The induced common mode (CM) and differential mode (dM) currents due to crosstalk are calculated by combining the obtained rLCG parameters with the chain parameter method. The obtained results show good agreement with that of FEKO software. Moreover, it is found that the star-quad cable can reduce the external coupling more effectively than that of the TBTWP cable. Finally, measurements are performed to further validate the accuracy of our proposed algorithm. © 2023 John Wiley & Sons, Ltd.

关键词： deep neural networks

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