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Suppressed grain boundary scattering effect to enhance electrical transport properties of La0.815Sr0.185MnO3 polycrystalline ceramic via high-temperature sintering process

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Ceramics International 2025年

作者： Liang, Xiaolu Chen, Zihao Wang, Zhenyu Pan, Zimeng Wang, Yao Wang, Haitao Sun, Jiankun Ma, Jun Jiang, Xuexing Peng, Jubo Gu, Xin Zhang, Jing Liu, Xiang Faculty of Material Science and Engineering Kunming University of Science and Technology Yunnan Kunming650093 China Kunming Kaihang Optoelectronic Technology Co. LTD Yunnan Kunming650200 China Company Limited R&D Center Yunnan Kunming650106 China

Polycrystalline La0.815Sr0.185MnO3 (LSMO) ceramic was synthesized using the sol-gel method. The effect of varying sintering temperatures (1763, 1783, 1803 and 1823 K) on the microstructure and electrical transport properties were systematically investigated. The samples exhibited a distinct dual-peak metal-insulator transition, with the first peak (Tp1) primarily influenced by grain boundary (GB) scattering effect. At lower sintering temperatures, lattice strain induced by the ionic size mismatch between La3+ and Sr2+ ions is transferred to the grain boundaries, increasing their contribution to resistivity. As the sintering temperature rises, the grain boundary effect diminish, leading to a suppression of the Tp1 peak. Elevated sintering temperatures further promote hybridization effect, enhancing the double exchange mechanism. As the temperature increases, this mechanism gradually becomes dominant, leading to a more pronounced influence of the Tp2 peak. Additionally, higher sintering temperatures reduce grain boundary scattering, improving the temperature coefficient of resistivity (TCr). At an optimal sintering temperature of 1803 K, the LSMO ceramic achieved a peak TCr of 10.78 % K−1 near room temperature (284.8 K), demonstrating strong potential for improved performance in uncooled infrared bolometers or electronic switch devices. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sol-gel process

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Output Controllability Analysis of the Affine Nonlinear Systems

Output Controllability Analysis of the Affine Nonlinear Syst...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Xia Xie Sixun Liu Qi Yuan Zhuo Wang CNPC Engineering Technology R & D Company Limited Beijing China School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China

ISBN: (纸本)9781665465373

In this paper, the output controllability of a class of affine nonlinear systems are investigated, which containing a continuous-time and discrete-time cases, respectively. According to these model, the sufficient and necessary criteria of its global output controllability are provided under some basic assumptions. Moreover, the simulation for verifying the validity of these theorems are implemented.

关键词： Automation Controllability Trajectory Nonlinear systems

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Comparison of bottom hole pressure acting modes between conventional hydraulic fracturing and pulsating hydraulic fracturing 55

Comparison of bottom hole pressure acting modes between conv...

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55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： Hou, Y.N. Peng, Y. Liu, Y.S. Chen, Z.X. Quan, Z.H. dong, J.N. China University of Petroleum-Beijing Changping Beijing China University of Calgary Calgary Canada The Second Gas Production Plant SINOPEC Southwest Oil and Gas Company Langzhong China CNPC Engineering Technology R&D Company Limited Beijing China

ISBN: (纸本)9781713839125

The pulsating hydraulic fracturing (PHF) technology generates a pulse pressure wave at a wellhead and then propagates this pulse pressure wave to the wellbore end to fracture the rock. Compared with the conventional hydraulic fracturing (CHF), PHF can induce more complex hydraulic fracture network with lower breakdown pressure. However, the difference of bottom hole pressure (BHP) acting modes between CHF and PHF is still not clear. In this study, the BHP of CHF was calculated by the conventional-BHP model, while the BHP for PHF was obtained by the transient flow model and the method of characteristic. The BHPs during the PHF for different input frequencies ranging from 0.01 Hz to 20 Hz were calculated. In addition, the difference of BHP acting modes between the CHF and PHF was analyzed and illustrated. results show that the BHP of the CHF is a constant pressure that smaller than the wellhead pressure. In contrast, the BHP of PHF is a pulse pressure with the same frequency as the input frequency when the input frequency is smaller than 10 Hz. Moreover, the amplitudes of BHPs for different input frequencies fluctuate with the input frequencies, and there are 17 pressure peaks for input frequencies ranging from 0.01 Hz to 20 Hz. According to the Vibration Theory, these 17 pressure peaks are induced by the resonance phenomenon and the corresponding frequencies are resonance frequencies. By optimizing the input frequency, a pulse BHP with an amplitude that is two times of the input amplitude at the wellhead can be obtained. These results provide guidance for the design and optimization of PHF construction parameters. © 2021 ArMA, American rock Mechanics Association.

关键词： Hydraulic fracturing

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Three-dimensional geomechanical model establishment and application based on complicated structures in yingxi area of qinghai oilfield 54

Three-dimensional geomechanical model establishment and appl...

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54th U.S. rock Mechanics/Geomechanics Symposium

作者： Qian, Wang Youyu, Wan Changkun, Cheng Shiduo, Liu Xinyuan, Feng Youmin, Liu CNPC Engineering Technology R&D Company Limited Beijing China Petrochina Qinghai Oilfield Company Dunhuang Gansu China

The Yingxi deep reservoir of Qinghai oilfield is very complicated. The reservoir has strong heterogeneity. The degree of fracture developed highly. The physical properties and in-situ stress vary widely. The geological structure is complex and there are many high-angle thrust faults. For such a complicated reservoir, the comprehensive evaluation in the stage of horizontal well design is an essential and important means to improve the production after hydraulic fracturing reconstruction. Well-seismic combination method is adopted to realize the expansion from "single well" to "reservoir". On the basis of one-dimensional geomechanical analysis, in combination with structural, geological and seismic data, the three-dimensional geomechanical parameter model was built, and detailed characterization of geomechanical parameters was described. Using advanced finite element simulator and large-scale parallel computing technology, a regional three-dimensional in-situ stress field model is established. On the basis of understanding the factors that affect the complexity of hydraulic fractures, it is realized that natural fractures, in-situ stress and brittleness are the main factors in the area. Completion quality index model is established by evaluating the characteristics of natural fractures, in-situ stress and brittleness. Combined with reservoir quality, the comprehensive evaluation index of reservoir was obtained. Fracturing stage optimization and perforation position optimization were carried out. © 2020 ArMA, American rock Mechanics Association

关键词： Fracture mechanics

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A Novel Foamy Well Killing Fluid for Low-Pressure Gas reservoirs in Tarim Basin, China

A Novel Foamy Well Killing Fluid for Low-Pressure Gas Reserv...

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2021 International Petroleum technology Conference, IPTC 2021

作者： Pan, Lijuan Liu, Huifeng Long, Wu Li, Jiaxue Li, Jianbo Liu, Qi Sinopec Northwest Petroleum Bureau Engineering Technology Research Institute Sinopec Key Laboratory for Enhanced Oil Recovery in Fractured and Vuggy Reservoirs CNPC Engineering Technology R&D Company Limited China China University of Petroleum Beijing @Keramay China PetroChina Tarim Oilfield Company China

ISBN: (纸本)9781613997314

Many mature gas reservoirs in China have very low formation pressure, like Yakela, dalaoba, Kekeya etc. The formation pressure coefficient ranges from 0.6 to 0.9. Conventional well killing fluids easily leak into the formation and damage the well productivity. There are alternative well killing fluids in the industry to kill low-pressure formations, including foamy fluid, oil-based emulsion fluid and well killing fluid with density reducing agent. However, the densities of these alternative well killing fluids are mostly higher than 0.8 g/cm3, and the cost is high if large volume of density reducing agent is used to decrease the density to lower than 0.8 g/cm3. In this paper, a formula of nitrogen foamy well killing fluid is developed and successfully used in sand removal operations in low-pressure gas reservoirs. A series of tests are conducted to select the optimal foaming agent, foam stabilizer and other additives. Sodium dodecyl sulfate is selected as the foaming agent. However, the properties of Sodium dodecyl sulfate are not stable in hard water, so we use dodecyl dimethyl betaine with sodium dodecyl sulfate together to increase the foaming ability in tough water environment like in the desert area. Xanthan gum is selected as a foam stabilizer because it can thicken the fluid phase and reduce the drainage speed. Gelatin is also added into the formula because it can form stable coacervate with xanthan gum. The concentration of each additive is also optimized through lots of tests. Then the properties of the foamy well killing fluid are tested. Its density is between 0.50-0.80 g/cm3 and is adjustable. Under the temperature of 150°C, its plastic viscosity is 51mPa.s;its yield point is 51.5 Pa;the half-life period reaches 3055min. These basic properties meet the requirements of being used as well killing fluid. Salinity tolerance and oil resistance tests are also conducted to see the toughest environment that the fluid can be used in. The results show that the for

关键词： Sodium dodecyl sulfate

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Multidimensional Lost Circulation risk Quantification Assessment Model Based on Ensemble Machine Learning

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SPE Journal 2025年第5期30卷 2285-2295页

作者： Mu, Huayan Jiang, Guancheng Zhang, Wei Sun, Jinsheng He, Yinbo dong, Tengfei Feng, Qi Wang, Quande Yang, Lili College of Artificial Intelligence China University of Petroleum (Beijing) State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum (Beijing) College of Petroleum Engineering China University of Petroleum (Beijing) (Corresponding author) College of Petroleum Engineering China University of Petroleum (Beijing) CNPC Engineering Technology R&D Company Limited Beijing PetroChina National College of Excellence Engineer Beijing College of Science China University of Petroleum (Beijing)

Summary. The risk of lost circulation is a complex problem that cannot be ignored during drilling operations, and accurate risk assessment is crucial for preventing and controlling lost circulation events. In this study, we establish a multidimensional lost circulation quantitative risk assessment model based on ensemble machine learning, comprehensively considering three dimensions—formation risk, drilling operation risk, and fluid circulation risk. It can effectively capture and quantify the complex interactive relationship between different risk factors, and the accuracy and efficiency of lost circulation risk assessment can be improved when ensemble machine learning algorithms determine different dimensional risk weights. The results of example verification show that when the threshold of the lost circulation risk index is set to 0.55, in the set of 442 samples drilled in a certain block, the assessment accuracy is 85.02% in the samples without lost circulation and 70.21% in the samples with lost circulation. This result reflects the uncertainty of the occurrence of lost circulation events in field operations, the difference in accuracy between the two categories is approximately 15%, and this error is within an acceptable range (0.1~0.2). The independent variable parameters of each dimension of risk in the model can be adjusted according to the actual situation of different blocks, and different lost circulation index thresholds and correction factors can be set. The established model has high adaptability, which can guide lost circulation prevention and control.

关键词： circulation risk geologist drilling fluids and materials geology risk management decision tree learning annular pressure drilling reservoir geomechanics calculation formula circulation event

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Study and Analysis of Casing/Tool Contamination and damage during Fluid Circulation of drilling Fluids in Ultra-deep Wells

SSRN

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SSrN 2023年

作者： Song, Hanxuan Guo, Jixiang Kiyingi, Wyclif Chen, Xiangwei Li, Binru Zhang, Shiling ruiying, Xiong Li, Wang Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

In drilling ultra-deep wells, the drilling fluid circulation usually causes erosion damage to downhole casing and drilling tools. However, the extent and process of this damage to the downhole tools is intricate and less understood. In order to systematically evaluate and clarify this damage process for different types of drilling fluid contamination, this research uses a high-temperature drilling fluid damage device to simulate the damage caused to the casing/drilling tools by various drilling fluids under a field thermal gradient. Several methods have been applied, such as micro-observation, roughness scanning, compositional detection, contact angle measurement to evaluate this damage to the metal samples. After simulated erosion damage, the metal samples were analyzed from multiple angles and in all directions. The results show that the drilling fluid residues are mainly solid-phase particles and organic components. The degree of casing/tool damage decreases with an increase in bottom hole temperature, and the casing/tool is least damaged within a temperature range of 150-180°C. Moreover, the surface of the casing/tool damaged by different types of drilling fluids shows different roughness, and the wettability of drilling fluids on the casing/tool surface increases with an increase in the degree of roughness. Oil-based muds have the strongest adhesion contamination on casing/drilling tools among the drilling fluids. In contrast, polysulfonated potassium muds and ultramicro drilling fluids have the most potent erosion damage on casing/drilling tools. By analyzing the damage mechanism, it was established that the damage was mainly dominated by the abrasive wearing from solid-phase particles in concert with corrosion ions in drilling fluids, with solids producing many abrasion marks and corrosive ions causing a large number of pits. The synergistic effect from the two mud constituents exacerbates the extent to which drilling fluids damage the casing/drilling tools.

关键词： Contamination

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Study and Analysis of Casing/Tool Contamination and damage during Fluid Circulation of drilling Fluids in Ultra-deep Wells

SSRN

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SSrN 2023年

作者： Song, Hanxuan Guo, Jixiang Wyclif, Kiyingi Chen, Xiangwei Xiong, ruiying Wang, Li Li, Binru Zhang, Shiling Unconventional Petroleum Research Institute China University of Petroleum Beijing102249 China State Key Laboratory of Petroleum Resource and Prospecting China University of Petroleum Beijing China CNPC Engineering Technology R&D Company Limited Beijing China

关键词： Contamination

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Field Test of Lithium Extraction in Oilfield Associated Water: A Case Study of YQ Treatment Station

Field Test of Lithium Extraction in Oilfield Associated Wate...

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2024 Abu dhabi International Petroleum Exhibition and Conference, AdIPEC 2024

作者： Miao, Xinyue Wen, Zhang ren, Yongcang Wang, Min Wang, Kelin Zhao, Zhiyong Liu, Zhiming Han, Guoqiang Ma, rui Chen, Xin Zhang, Lei deng, Qianxing Tarim Oilfield Company CNPC Xinjiang Province Korla City China Engineering Research Center for Ultra-deep Complex Reservoir Exploration and Development Xinjiang Uygur Autonomous Region Xinjiang Province Korla City China R&D Center for Ultra Deep Complex Reservior Exploration and Development CNPC Xinjiang Province Korla City China Southwest Petroleum University Sichuan Province Chengdu City China Xinjiang Key Laboratory of Ultra-deep Oil and Gas Xinjiang Province Korla City China Shanghai Huiliyuan Technology Co. Ltd. Shanghai City China BGP CNPC Hebei Province China

ISBN: (纸本)9781959025498

The oilfield associated water is complex in composition and poses significant hazards, necessitating treatment to prevent environmental pollution. Taking the Yingqian Treatment Station as an example, it processes approximately 2,400m3 of water daily. Sampling and testing revealed that the total hardness of the water exceeds 20,000mg/L, with a Mg2+ concentration of about 1,200mg/L. Most importantly, the Li+ concentration reached 150mg/L, meeting the requirements for economic development (≥50mg/L). Consequently, related research and experiments were promptly initiated. Owing to the associated water's high total hardness and low lithium content, which significantly differ from saturated brine, traditional lithium extraction techniques cannot be directly applied. In response, research has identified that manganese-based adsorbents offer the advantage of high adsorption capacity, but require concentrated acid for desorption. Conversely, bipolar membrane electrodialysis has the merit of producing lithium products with high purity;however, the byproduct concentrated acid is a hazardous chemical that necessitates proper disposal. Consequently, a combined technological approach has been proposed to leverage the strengths of both methods. The lithium extraction experiment from oil-gas field associated water at the YQ Treatment Station in China was conducted from May to June 2023, successfully producing 2.05kg of monohydrate lithium hydroxide from 116m3 of associated water. However, the experiment encountered numerous issues. For instance, the LiCl solution after a single desorption with HCl failed to meet the feed concentration requirements for subsequent processes. After extensive argumentation, the solution was adjusted by using a mixture of LiCl and HCl from the first desorption to replace HCl as the desorbent, and adjusting the desorption process from one stage to two, thereby increasing the LiCl concentration. The daily production of associated water in blocks such as Yi

关键词： Gas industry

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Matching Analysis and Experimental Study of Mechanical Properties of Cement Sheath Interface

SSRN

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SSrN 2022年

作者： Cheng, Y.Q. Liu, S.Q. Shen, J.Y. Guo, X.L. Huang, Z. Liu, H.T. Research Institute of Petroleum Exploration & Development Beijing100089 China Cementing and Completion Research Institute CNPC Engineering Technology R&D Company Limited Beijing102206 China

Clarifying the mechanism of cement sheath interface matching and determining the cement sheath interface matching under specific downhole conditions is a fundamental and challenging requirement for accurate prediction of cement sheath integrity. The mechanical properties of the cement sheath interface, an important component of the cement sheath integrity, are the key factors affecting the damage of the cement interface. In this study, we propose a method to measure the variation of cement sheath interfacial match with the mechanical properties of the cement sheath under typical downhole conditions, including the Young's modulus of the cement sheath and the Poisson's ratio. The analysis of cement sheath interface matching was further combined with experimental methods to test the accuracy of the cement sheath interface matching method in this study and to assess the cement sheath integrity capabilities of different cement types under different operating conditions. The numerical results show that increasing the cement sheath Young's modulus as well as decreasing the Poisson's ratio without considering the downhole conditions can improve the cement sheath interface matching, but the cement sheath interface is more sensitive to the cement sheath Poisson's ratio. Laboratory measurements have shown that reducing Poisson's ratio by adding materials such as latex to cement significantly improves the cement's ability to ensure cement sheath integrity, although the Young's modulus of the cement sheath decreases in parallel with the addition of latex. Based on the results of the experimental and numerical methods, qualitative and quantitative recommendations are provided for field operations to suppress cement sheath integrity risks throughout the life cycle of the wellbore. © 2022, The Authors. All rights reserved.

关键词： Poisson ratio

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