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Reservoir heterogeneity controls of CO_(2)-EOR and storage potentials in residual oil zones:Insights from numerical simulations

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Petroleum Science 2023年第5期20卷 2879-2891页

作者： Yan-Yong Wang Xiao-Guang Wang Ren-Cheng Dong Wen-Chao Teng Shi-Yuan Zhan Guang-Yong Zeng Cun-Qi Jia College of energy Chengdu University of TechnologyChengdu610059SichuanChina State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Engineering Research Center of geothermal Resources Development Technology and Equipment Ministry of EducationJilin UniversityChangchun130026JilinChina The University of Texas at Austin AustinTX78712USA Department of energy Resources Engineering Stanford UniversityStanfordCA94305USA State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of TechnologyChengdu610059SichuanChina

Residual oil zones(ROZs)have large potential for CO_(2)enhanced oil recovery(EOR)and geologic *** CO_(2)injection,the migration of CO_(2)in ROZs controls the performance of both EOR and ***,it has not been clearly visualized and understood that how geological heterogeneity factors control the transport of CO_(2)in *** this study,the oil recovery performance and geologic storage potential during continuous CO_(2)injection in a representative ROZ are studied based on geostatistical modelling and high-fidelity three-phase flow *** examined the influence of autocorrelation length of permeability,global heterogeneity(DykstraeParsons coefficient),and permeability anisotropy on cumulative oil recovery and CO_(2)retention *** results indicate that,as the permeability autocorrelation length increases,the cumulative oil recovery and CO_(2)storage efficiency *** results from the accelerated migration of CO_(2)along high permeability zones(i.e.,gas channeling).The increase in global heterogeneity and permeability anisotropies can lead to low oil recovery and poor CO_(2)sequestration performance,depending on the degree of CO_(2)*** net utilization ratio of CO_(2)(CO_(2)retained/oil produced)unfavorably increases with both autocorrelation length and Dykstra eParsons coefficient,but decreases with the increase in kv/*** a decrease is attributed to enlarged swept volume induced by gravity *** study provides important implications for fieldscale CO_(2)EOR and storage applications in ROZs.

关键词： Residual oil zones CO_(2)injection Enhanced oil recovery Geologic sequestration

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含相变材料的充填体内置采热管群热压性能研究

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Journal of Central South University 2024年第2期31卷 649-669页

作者：张小艳杜强强刘浪许慕妍柯亚萍王雪丽 energy School Xi’an University of Science and TechnologyXi’an 710054China School of Architecture and Civil Engineering Xi’an University of Science and TechnologyXi’an 710054China Key Laboratory of Western Mines and Hazards Prevention Ministry of EducationXi’an 710054China Shenzhen iTeaQ Network Power Technology Co. Ltd.Shenzhen 518110China

通过将采热管群与充填采矿技术相结合可提取矿井中的地热能,有效缓解高地热带来的热害问题。本文以采热管群为研究对象,分析了充填体放热过程中传热流体的温度、速度和压力分布,讨论了雷诺数、管径、管间距和管排方式对采热管群性能的... 详细信息

通过将采热管群与充填采矿技术相结合可提取矿井中的地热能,有效缓解高地热带来的热害问题。本文以采热管群为研究对象,分析了充填体放热过程中传热流体的温度、速度和压力分布,讨论了雷诺数、管径、管间距和管排方式对采热管群性能的影响。结果表明:当雷诺数从100增加到5000时,换热量从2.24×10^(3)kJ增加到16.78×10^(3)kJ,综合评价因子从0.087增加到1.31。当管径从4 mm增加到6 mm时,换热量从15.07×10^(3)kJ增加到17.11×10^(3)kJ,综合评价因子从1.157增加到1.388。当管间距从130 mm增加到170 mm时,换热量从14.24×10^(3)kJ增加到16.25×10^(3)kJ,综合评价因子从1.013增加到1.263。此外,四路并联布置可以保证较高的换热量和较低的压降,从而获得较高的综合评价因子。该研究为充填体中采热管群的设计和优化提供了理论参考。

关键词：采热管群充填体换热压降综合性能

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Feedforward Neural Network for joint inversion of geophysical data to identify geothermal sweet spots in Gandhar,Gujarat,India

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energy Geoscience 2021年第3期2卷 189-200页

作者： Apurwa Yadav Kriti Yadav Anirbid Sircar Silver Oak College of Engineering and Technology S.G.RoadGujaratIndia Centre of Excellence for geothermal energy Pandit Deendayal Petroleum UniversityRaisanGandhinagar382007GujaratIndia DG GERMI and HeadCentre of Excellence for Geothermal EnergyPandit Deendayal Petroleum UniversityRaisanGandhinagar382007GujaratIndia

Artificial Neural Networks(ANNs)are used in numerous engineering and scientific disciplines as an automated approach to resolve a number of ***,to build an artificial neural network that is prudent enough to rely on,vast quantities of relevant data have to be *** this study,we analysed the scope of artificial neural networks in geothermal reservoir *** particular,we attempted to solve joint inversion problem through Feedforward Neural Network(FNN)*** order to identify geothermal sweet spots in the subsurface,an extensive geophysical studies were conducted in Gandhar area of Gujarat,*** data were acquired along six profile lines for gravity,magnetics and *** low velocity zone was identified using refraction seismic technique in order to set a common datum level for other potential *** depth of low velocity zone in Gandhar was identified at 11 *** FNN backpropagation method was applied to gain the global minima of the data space and model space as *** input dataset fed to the inversion algorithm in the form of gravity,magnetic susceptibility and resistivity helped to predict the suitable model after network training in multiple *** joint inversion of data is conducive to understanding the subsurface geological and lithological features along with probable geothermal sweet *** results of this study show the geothermal sweet spots at depth ranging from 200 m to 300 *** results from our study can be used for targeted zones for geothermal water exploitation.

关键词： Artificial neural network(ANN) Geotherm Feedforward neural network(FNN) Geophysics Machine learning(ML)

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Effect of Boiling and Cooling of geothermal Fluids on Precipitation of Secondary Minerals: A Case Study of Olkaria Fields, Kenya

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Journal of Geoscience and Environment Protection 2022年第9期10卷 251-270页

作者： Emmanuel Onesimo Duku Benson G. Ongarora Paul Tanui geothermal energy Training Institute (GeTRI) Dedan Kimathi University of Technology Nyeri Kenya Department of Chemistry Dedan Kimathi University of Technology Nyeri Kenya

The main drawback in the utilization of geothermal resources arises from the precipitation of secondary minerals within wells, pipelines, steam separators, turbines and other surface equipment in form of scales. Scale formation is an outcome of the alteration of various rocks dissolved in geothermal fluids that find their way into a reservoir. Once geothermal fluids ascend to the surface, hydrostatic pressure decreases toward a phase separation level that permits the dissolved gases such as CO2, H2S and H2, and steam to separate from the liquid phase by “boiling”. Stripping of these volatiles may increase fluid pH, leading to precipitation and deposition of secondary minerals. The study sought to establish the relationship between water-rock interaction and secondary mineral precipitates at the surface and deep fluid at different temperatures during depressurisation boiling and cooling. Samples were collected from selected Olkaria wells;OW-38A, OW-910 and OW-910A. The analysis of the results outlined deep fluid Alkali-Chloride waters and surface steam-heated Alkali-Bicarbonate and acidic Sulphate-Chloride waters. Various models suggested adiabatic boiling, conductive cooling and possible mixing and dilution in the wells. Hydrothermal alteration minerals were found to be in equilibrium with the geothermal fluids at varying temperatures, and the secondary minerals controlled the chemistry of the reservoir. Silica-saturated solutions precipitated silica in OW-910 and OW-910A, which may have resulted from rapid cooling following mixing with cold surface water.

关键词： Adiabatic Boiling Aqueous Speciation Clogging Conductive Cooling Depressurisation Boiling Equilibrium Degassing Phase Separation Saturation Index

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The influence of pore characteristics on rock fragmentation mechanism by high-voltage electric pulse

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Plasma Science and Technology 2023年第5期25卷 116-130页

作者：刘伟吉张有建祝效华罗云旭 School of Mechatronic Engineering Southwest Petroleum UniversityChengdu 610500People’s Republic of China geothermal energy Research Center Southwest Petroleum UniversityChengdu 610500People’s Republic of China

High-voltage electric pulse(HVEP)is an innovative low-energy and high-efficiency ***,the underlying physics of the electrical breakdown within the rock,and the coupling mechanism between the various physical fields involved in HVEP still need to be further *** this study,we establish a 2D numerical model of multi-physical field coupling of the electrical breakdown of porous rock with randomly distributed pores to investigate the effect of pore characteristics(porosity,pore media composition)on the partial electrical breakdown of rock(*** generation of a plasma channel inside the rock).Our findings indicate that the generation of a plasma channel is directionally selective and extends in the direction of a weak electrical breakdown *** the porosity of the rock increases,so does the intensity of the electric field in the‘electrical damage’region—the greater the porosity,the greater the effectiveness of *** the fraction of pore fluid(S_(water)/S_(air))gradually declines,the generation time of the plasma channel decreases,and the efficacy of rock-breaking by HVEP *** addition,in this study,we conducted an indoor experiment utilizing an electric pulse drill to break down the rock in order to recreate the growth mode of the plasma channel in the ***,the experimental results are consistent with the simulation *** addition,the development of this type of partial electrical breakdown is confirmed to be related to electrode polarity and pore characteristics via the experiment of the symmetrical needle-needle electrode arrangement,which further demonstrates the mechanism of partial electrical *** research is significant for comprehending the process of electric impulse rock-breaking and gives theoretical guidance and technological support for advancing electric impulse drilling technology.

关键词： high-voltage electric pulse pore characteristics electrical breakdown porous rock plasma channel electrical breakdown test

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A thermodynamics comparison of subcritical and transcritical organic Rankine cycle system for power generation

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Journal of Central South University 2015年第9期22卷 3641-3649页

作者：朱家玲薄华宇李太禄胡开永刘克涛 Key Laboratory of Efficient Utilization of Low and Medium Grade energy of Ministry of Education (Tianjin University) Tianjin geothermal Research and Training Center School of Mechanical Engineering Tianjin University Department of Thermal Engineering School of Energy and Safety Engineering Tianjin Chengjian University

A comparison on subcritical and transcritical organic Rankine cycle(ORC) system with a heat source of 110 °C geothermal water was presented. The net power output, thermal and exergy efficiencies and the products of the heat transfer coefficient(U) and the total heat exchange area(A)(UA values) were calculated for parametric optimization. Nine candidate working fluids were investigated and compared. Under the given conditions, transcritical systems have higher net power outputs than subcritical ones. The highest net power output of transcritical systems is 18.63 k W obtained by R218, and that of subcritical systems is 13.57 k W obtained by R600 a. Moreover, with the increase of evaporating pressure, the thermal and exergy efficiencies of transcritical systems increase at first and then decrease, but the efficiencies of subcritical ones increase. As a result, the efficiencies of transcritical systems cannot always outperform those of the subcritical ones. However, the subcritical systems have lower minimum UA values and lower expansion ratios than the transcritical ones at the maximum net power output. In addition, the transcritical cycles have higher expansion ratios than the subcritical ones at their maximum net power output.

关键词：跨临界亚临界循环系统热力学临界系统输出功率发电热源系统

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Phase Relations and Pressure-Volume-Temperature Equation of State of Galena

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Chinese Physics Letters 2010年第8期27卷 151-154页

作者：范大伟周文戈魏舒怡刘景李延春蒋升谢鸿森 Laboratory for Study of the Earth's Interior and geofluids Institute of Geochemistry Chinese Academy of Sciences Guiyang 550002 Institute of High energy Physics Chinese Academy of Sciences Beijing 100049 Graduate University of the Chinese Academy of Sciences Beijing 100049

The phase relations and pressure volume dependences of galena （PbS） under high pressure and high temperature are investigated by means of in situ observation using resistance heating in a diamond anvil cell and synchrotron radiation. The phase transition from NaCl type to TII type takes place at approximately 2.4 GPa. A fit to the high temperature third-order Bireh-Murnaghan equation of state yields an isothermal bulk modulus Ko = 37（3） GPa, and its pressure derivative K＇0 = 3.6（3）, the temperature derivative of the bulk modulus （ K/ T）p = -0.022（9） GPaK^-1, and the thermal expansion coeffeient α0 = 2.2（5） × 10^-5 K^-1 for TII-type galena. The linear compressibilities j3 along a, b and c directions of TII type is elastically anisotropic （βa = 3.4 × 10^-3 GPa^-1, βb = 1.4× 10^-4 GPa^-1 and βc = 1.6 × 10^-3 GPa^-1）. We obtain the temperature derivative of the bulk modulus （ K/ T）p and thermal expansion coefficient α0 for TlI-type galena for the first time.

关键词： Heat Temperature Pressure Lymphocytes Potassium

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Noble-metal-free catalyst with enhanced hydrogen evolution reaction activity based on granulated Co-doped Ni-Mo phosphide nanorod arrays

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Nano Research 2020年第12期13卷 3321-3329页

作者： Heping Xie Cheng Lan Bin Chen Fuhuan Wang Tao Liu Institute of New energy and Low-Carbon Technology Sichuan UniversityChengdu610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen518060China School of Chemical Engineering Sichuan UniversityChengdu610065China

The development of noble-metal-free electrocatalysts for water splitting is indispensable for the efficient production of hydrogen ***,a Co-doped Ni-Mo phosphide nanorod arrays fabricated on porous Ni foam was shown to be an efficient binder-free electrocatalyst for water *** catalyst featured exceptional activity,exhibiting an overpotential of 29 mV at a current density of 10 mA·cm−2 for the hydrogen evolution reaction,whereas the corresponding precatalyst exhibited an overpotential of 314 mV at a current density of 50 mA·cm^−2 for the oxygen evolution *** achieved electrocatalytic performance provided access to a simple water splitting system,affording a current density of 10 mA·cm^−2 at 1.47 V in 1 M KOH *** functional theory results indicated that Co doping and phosphorization were responsible for the high electrocatalytic ***,this work paves the way for the development of novel noble-metal-free electrocatalysts for practical H2 production via water splitting.

关键词： noble-metal-free electrocatalyst overall water splitting cobalt doping phosphorization granulated morphology

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Thermal Response Test by Improved Test Rig with Heating or Cooling Soil

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Transactions of Tianjin University 2014年第1期20卷 15-20页

作者：付文成朱家玲张伟 Key Laboratory of Efficient Utilization of Low and Medium Grade energy of Ministry of Education Tianjin University Tianjin geothermal Research and Training Center Tianjin University

An improved test rig providing both the heat and cold source was used to perform thermal response test(TRT), and the line source model was used for data analysis. The principle of determining the temperature difference between the inlet and outlet of test well can keep the heating or cooling rate constant, along with a reduced size of test rig. Among the influencial factors of the line source model, the temperature difference was determined as the most important, which agreed with the test results. When the gravel was taken as the backfill material, the soil thermal conductivities of heating and cooling at the test place were 1.883 W/(m·K) and 1.754 W/(m·K), respectively, and the deviation of TRT between heating and cooling soil was 6.8%. In the case of fine sand, the thermal conductivities of heating and cooling were 1.541 W/(m·K) and 1.486 W/(m·K), respectively, and the corresponding deviation was 6%. It was also concluded that different velocities of water had less influence on TRT than the temperature difference.

关键词：测试装置土壤改良试验台热响应冷却加热速率常数影响因素

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Seismic geothermal Resource Exploration based on CPU/GPU Collaborative Parallel Prestack Time Migration

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Acta Geologica Sinica(English Edition) 2022年第5期96卷 1742-1751页

作者： LONG Xiting LIU Fei XIE Heping LIN Wenjing LIU Yanguang LI Cunbao Shenzhen Key Laboratory of Deep Underground Engineering Sciences and Green energy Shenzhen UniversityShenzhen 518060China Guangdong Provincial Key Laboratory of Deep Earth Sciences and geothermal energy Exploitation and Utilization College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Sichuan University State Key Lab Hydraul&Mt River EngnChengdu 610065China Institute of Hydrogeology and Environmental Geology Chinese Academy of Geological SciencesShijiazhuang 050061China Sichuan University MOE Key Laboratory of Deep Earth Science and EngineeringChengdu 610065China

geothermal resources exist in complex and comprehensive geological settings. In the current study, we proposed a CPU/GPU collaborative parallel prestack time migration methodology for geothermal resource exploration. First, seismic geological conditions in Xian County were obtained based on an analysis of drill cores for further seismic evaluation. Then,combined with the analysis of two-dimensional seismic data in the adjacent area, a test section with three seismic survey lines were designed to explore the geological structure of the study area. In the study area, the seismic data were derived through the multiple coverage reflection wave exploration method with explosive ignition in deep wells and high coverage frequency observations. Finally, we employed CPU/GPU collaborative parallel prestack time migration technology to analyze the obtained seismic data for geothermal resource evaluation. The favorable areas of karst fissure heat storage in Middle–Upper Proterozoic Jixianian and Paleozoic Cambrian–Ordovician rocks were inferred together with two preferred recommended exploration holes.

关键词： seismic explosive source geological structure geothermal

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