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Acid-rock reaction kinetics in a two-scale model based on reaction order correction

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Petroleum Science 2024年第3期21卷 2089-2101页

作者： Xue-Song Li Ning Qi Ze-Hui Zhang Lian Liu Xia-Qing Li Xu-Hang Su School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Key Lab of Unconventional Oil&Gas Development Ministry of EducationChina University of Petroleum(East China)Qingdao26650ShandongChina sinopec northwest oilfield branch Company Urumqi830011XinjiangChina Petroleum Engineering Technology Research Institute SINOPEC Shengli Oilfield CompanyDongying257000ShandongChina

The reaction order plays a crucial role in evaluating the response rate of ***,the conventional two-scale model typically assumes that the reaction order is constant as one,which can lead to significant deviations from *** address this issue,this study proposes a novel multi-order dynamic model for acid-rock reaction by combining rotating disk experimental data with theoretical *** numerical simulations,this model allows for the investigation of the impact of acidification conditions on different orders of reaction,thereby providing valuable insights for on-site *** analysis reveals that higher response orders require higher optimal acid liquid flow rates,and lower optimal H+diffusion coefficients,and demonstrate no significant correlation with acid ***,it is recommended to increase the displacement and use high-viscosity acid for reservoirs with high calcite content,while reducing the displacement and using low-viscosity acid for reservoirs with high dolomite content.

关键词： Reaction order Two-scale model Wormhole propagation Carbonate rocks Numerical simulation

Remaining oil distribution characteristics in an oil reservoir with ultra-high water-cut

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Energy Geoscience 2024年第1期5卷 219-223页

作者： Hongmin Yu Youqi Wang Li Zhang Qingxin Zhang Zhenhai Guo Benzhe Wang Tao Sun sinopec Petroleum Exploration and Development Research Institute Beijing100083China Shengli Oil Production Plant SINOPEC Shengli Oilfield BranchDongyingShandong257051China

An accurate mapping and understanding of remaining oil distribution is very important for water control and stabilize oil production of mature oilfields in ultra-high water-cut ***,the Tuo-21 Fault Block of the Shengtuo oilfield has entered the stage of ultra-high water cut(97.2%).Poor adaptability of the well pattern,ineffective water injection cycle and low efficiency of engineering measures(such as workover,re-perforation and utilization of high-capacity pumps)are the significant problems in the ultra-high water-cut *** order to accurately describe the oil and water flow characteristics,relative permeability curves at high water injection multiple(injected pore volume)and a semiquantitative method is applied to perform fine reservoir simulation of the Sand group 3e7 in the *** accurate reservoir model is built and history matching is *** distribution characteristics of remaining oil in lateral and vertical directions are quantitatively simulated and *** results show that the numerical simulation considering relative permeability at high injection multiple can reflect truly the remaining oil distribution characteristics after water flooding in an ultrahigh water-cut *** distribution of remaining oil saturation can be mapped more accurately and quantitatively by using the‘four-points and five-types’classification method,providing a basis for potential tapping of various remaining oil types of oil reservoirs in late-stage of development with high water-cut.

关键词： Ultra-high water-cut High water injection multiple Four-points and five-types Numerical simulation Remaining oil distribution

Oxidative dehydrogenation of ethane with carbon dioxide over silica molecular sieves supported chromium oxides:Pore size effect

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Chinese Journal of Chemical Engineering 2021年第6期34卷 77-86页

作者： Zhibin Deng Xing Ge Wenting Zhang Shizhong Luo Jun Shen Fangli Jing Wei Chu College of Civil Aviation Safety Engineering Civil Aviation Flight University of ChinaGuanghan 618307China sinopec Petroleum Exploration and Production Research Institute Northwest Oilfield BranchUrumqi 830011China School of Chemical Engineering Sichuan UniversityChengdu 610065China

SBA-15 with varied pore size from 4 to 8 nm were synthesized by tuning the temperature of hydrothermal treatment,the supports were then used to load the active phase Cr Oxthrough a conventional impregnation *** resulting catalysts were characterized by small/wide angle XRD,N_(2) adsorption/desorption,FT-IR,TEM-EDX,XPS,TPR and CO_(2)-TPD to study the feature of structure,surface chemical state,redox and *** was found from these results that the metal species could be well dispersed on catalysts with larger pore ***^(6+)species could enter into the framework by substituting the Si atoms of SBA-15,and Cr^(3+)mainly exist on extra *** size had profound effects on reducibility,surface composition and ***^(6+)species were necessary to activate the C-H bonds of alkanes,while the basicity played an important role in activating C-O bonds of CO_(2).The best performances were achieved over the sample Cr supported on SBA-15 with a pore diameter of 7 nm in oxidative dehydrogenation of ethane in the presence of CO_(2).

关键词： Ethylene SBA-15 Pore size effect Cr catalysts Heterogeneous catalysis

Thermodynamic Analysis and Optimization of the C3/MRC Liquefaction Process

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Energy Engineering 2023年第6期120卷 1503-1514页

作者： Guisheng Wang oilfield Safety and Environmental Quality Management Department Sinopec Shengli Oilfield CompanyDongying257001China

In the natural gas liquefaction process,the mixed refrigerant natural gas liquefaction process is widely used in LNG liquefaction plants because of its advantages of low energy *** paper focuses on the influences of important parameters in the C3/MRC liquefaction process,that is,the comparison between propane precooling temperature and the number of moles of methane in mixed refrigerant,power consumption and *** addition,the total process was optimized with the optimizer and manual adjustment in HYSYS software to minimize the total power *** results show that with increasing propane precooling temperature,the propane flow rate is almost unchanged,while the mixed refrigerant flow rate decreases significantly,and the loss of the heat exchanger increases *** power consumption of the propane precooling cycle and hybrid refrigeration cycle increases with increasing methane content in the refrigerant,so the power consumption of the whole process increases *** effect of the methane content in the mixed refrigerant on the process evaluation index is more significant than that of the propane precooling temperature.

关键词： C3/MRC process propane precooling temperature methane content optimization

An efficient hybrid model for fractured reservoirs

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Science China(Technological Sciences) 2016年第10期59卷 1609-1616页

作者： YAN Xia HUANG ZhaoQin YAO Jun LI Yang FAN DongYan SONG WenHui School of Petroleum Engineering China University of Petroleum (East China) Department of oilfield Exploration & Development Sinopec

In this study, an efficient hybrid model is proposed to simulate the fluid flow in the reservoirs with multi-scale fractures, which cannot be easily modeled by neither the continuum models nor the discrete fracture models. In the proposed method, the small fractures are modeled by using an improved Multiple Sub-Region method, which can capture the strongly anisotropy of fracture elements and the effects of border region on the transmissibility and provide more accurate results, on the other hand, the large fractures are modeled explicitly as major fluid conduits by the Embedded Discrete Fracture Model. Then, an efficient numerical algorithm based on the Mimetic Finite Difference method is developed to solve the hybrid method. At the end, several numerical examples are carried out to verify the accuracy and applicability of the proposed numerical model.

关键词： fractured reservoirs hybrid model oversampling approach multiple sub-region method mimetic finite difference

Geochemical characteristics of noble gases in natural gas and their application in tracing natural gas migration in the middle part of the western Sichuan Depression, China

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Petroleum Science 2013年第3期10卷 327-335页

作者： Wang Peng Shen Zhongmin Liu Sibing Lv Zhengxiang Zhu Tong Gong Yajun State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of Technology Geology Scientific Research Institute of Shengli oilfield branch Company SINOPEC

Noble gases in natural gas, from Xiaoquan, Xinchang, Hexingchang and Fenggu gas reservoirs in the middle part of the western Sichuan Depression, China, were analysed. Results show that the volume content of crustal noble gases accounts for 97.9% to 99.7% of the total noble gas content, indicating that the noble gases in the study area are very largely derived from the crust. Moreover, the 40Ar time-accumulating effect of source rocks is used to determine the complex relationship between gases and source rocks in this area, and the results agree well with that from analysis of source rock light hydrocarbons. Due to the short migration distance, the separation of 4He and 40Ar is not significant in Xujiahe natural gas and Lower and Middle Jurassic natural gas, so it is difficult to trace natural gas migration. However, this separation characteristic of 4He and 40Ar in Middle and Upper Jurassic natural gas is significant, which indicates that natural gas migration was from the Middle Jurassic to Upper Jurassic formations. In addition, the variation trends of 3He/4He ratio and δ13C1 value indicates that natural gas migration is from the Xujiahe formation to the Jurassic layer in the study area.

关键词： Western Sichuan Depression noble gas He and Ar isotopes natural gas migration

The Influence of Acid on the RockMechanical Characteristics of Deep Shale in theWujiaping Formation

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Energy Engineering 2024年第1期121卷 27-42页

作者： Hao Zhang Yan Zhang Wei Liu Ximin Zhang Xiang Liu School of Petroleum Engineering Yangtze UniversityWuhan430100China Petroleum Engineering Technology Research Institute Jianghan Oilfield Branch of SinopecWuhan430035China Drilling Technology Research Institute Sinopec Shengli Oilfield Service CorporationDeyang618000China

The microscopic characteristics and mechanical properties of rocks change after the action of acid on deep shale,which affects the fracturing ***,we designed and conducted indoor experiments related to the changes in macro and microscopic characteristics after the interaction of acid with the shale of Wujiaping Formation,based on which the characteristic law of fracture volume modification after acid fracturing was studied using numerical *** results demonstrate that the pores and fractures are enlarged and the structure is significantly loosened after the acid *** a 15%concentration of hydrochloric acid can effectively dissolve ***,the degree of acid-etching reaction is highly variable because of the different carbonate content,which reveals the strong inhomogeneity of the shale system in the Wujiaping Group reservoir *** the acid interacted with the shale rock samples,the triaxial compressive strength,elastic modulus,and Poisson’s ratio of shale ***,the evaluation of the effect after acid fracturing simulated by fracturing software revealed that the smaller the value of elastic modulus in shale-based reservoirs,the more favorable the fracture volume *** discovery not only provides a theoretical basis for the expansion and extension patterns of acid-fracturing in carbonaceous shale formations but also offers research methods and theoretical insights for the fundamental exploration of other deep-seated oil and gas resources.

关键词： Shale acid fracturing macro characteristics microscopic characteristics mechanical properties

Production Capacity Prediction Method of Shale Oil Based on Machine Learning Combination Model

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Energy Engineering 2024年第8期121卷 2167-2190页

作者： Qin Qian Mingjing Lu Anhai Zhong Feng Yang Wenjun He Min Li Petroleum Engineering Technology Research Institute of Shengli oilfield SINOPECDongying257000China Postdoctoral Scientific Research Working Station of Shengli oilfield SINOPECDongying257000China

The production capacity of shale oil reservoirs after hydraulic fracturing is influenced by a complex interplay involving geological characteristics,engineering quality,and well *** relationships,nonlinear in nature,pose challenges for accurate description through physical *** field data provides insights into real-world effects,its limited volume and quality restrict its *** this,numerical simulation models offer effective *** harness the strengths of both data-driven and model-driven approaches,this study established a shale oil production capacity prediction model based on a machine learning combination *** fracturing development data from 236 wells in the field,a data-driven method employing the random forest algorithm is implemented to identify the main controlling factors for different types of shale oil *** the combination model integrating support vector machine(SVM)algorithm and back propagation neural network(BPNN),a model-driven shale oil production capacity prediction model is developed,capable of swiftly responding to shale oil development performance under varying geological,fluid,and well *** results of numerical experiments show that the proposed method demonstrates a notable enhancement in R2 by 22.5%and 5.8%compared to singular machine learning models like SVM and BPNN,showcasing its superior precision in predicting shale oil production capacity across diverse datasets.

关键词： Shale oil production capacity data-driven model model-driven method machine learning

Study of asphaltene dispersion and removal for high-asphaltene oil wells

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Petroleum Science 2012年第4期9卷 551-557页

作者： Chen Chaogang Guo Jixiang An Na Pan Yangqiu Li Yaguang Jiang Qingzhe China University of Petroleum Beijing 102249China Key Laboratory of Shale Gas Exploration Ministry of Land and ResourcesChongqing Institute of Geology and Mineral ResourcesChongqing 400042China northwest oilfield branch Engineering and Technology Institute of sinopec Ummchi 830011China

Many wellbores are blocked by asphaltene deposits,which lead to production problems in the oilfield development *** this paper,methods such as elemental analysis,and solvent extraction are adopted for the study of wellbore *** content of organic matter in blockages is higher than 96% and asphaltene is the main component of the organic matter with n-heptane asphaltene content of 38%.Based on the above analyses,an agent for asphaltene dispersion and removal（named as SDJ） was *** performance of the SDJ agent was evaluated,and it was found that the dissolution rate of asphaltene can reach 2.9 ***-1 at 60 *** agent（1wt%） was added to crude oil with a colloid instability index greater than 0.9 can effectively inhibit asphaltene deposition in the *** the viscosity method,the dissolution amount of SDJ agent was calculated,and it was found that when the viscosity of the system is around 2,000 mPa.s（the common viscosity of crude oil）,the amount of SDJ agent added to the blockage was at least 96 g per 100 g ***,SDJ agent has promising application for dispersion and removal of asphaltene deposition in high-asphaltene wells.

关键词： Asphaltenes asphalthene dispersion and removal blockages oil well evaluation