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Experimental investigation of the influence of carbonated water on sandstone and carbonate rock properties

Petroleum Research 2023年第3期8卷 316-323页

作者： Hisham Ben Mahmud Mohamed Khalifa mian shafiq Ausama Giwelli Department of Chemical and Energy Engineering Curtin University MalaysiaFaculty of Engineering and ScienceMiri98009SarawakMalaysia Energy and Environmental Research Cluster Faculty of Engineering and ScienceCurtin University MalaysiaSarawak98009Malaysia Department of Earth Sciences School of Basic SciencesLibyan Academy of Postgraduate StudiesPO Box79031JanzourLibya Department of Chemical and Petroleum Engineering UCSI University56000Malaysia Australian Resources Research Centre CSIROKensingtonAustralia

Laboratory measurements using nuclear magnetic resonance,scanning electron microscopy,and gas porosity and permeability analysis were conducted to acquire a petrophysical interpretation of the Carbon Tan Sandstone and Savonnieres Carbonate for potential carbon dioxide storage in subsurface *** relationships between pore structures,such as pore-size distribution,pore geometry,and porosity/permeability,were investigated near and far from the *** operating pressures of 2500psi(17.24 MPa)and temperatures of 176F(50℃),carbonated water was injected into a composite core constructed of two similar core samples bounded by a compact disc located between *** current results showed that a strong calcite dissolution took place near the injection position of both rock samples and led to improvements in the primary intergranular permeability and porosity,while the carbonate sample showed significant improvement compared to *** durable heterogeneous dissolution of calcite grains also led to the creation of new pores as intra-granular *** at deeper depths from the injection position,it noticed an insignificant development in pore structure and its populations as well as rock hydraulic properties of both rock *** conclusion,the study revealed that the injected carbonated brine had a valuable impact on fluid-formation interactive,which improved rock's inlet properties compared with outlet.

关键词： CO_(2)ebrine injection Fluid-carbonate/sandstone interaction Petrophysical properties Pore structure NMR SEM analysis

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Integrated Mineral Analysis of sandstone and dolomite formations using different chelating agents during matrix acidizing

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Petroleum 2019年第1期5卷 67-76页

作者： mian Umer shafiq Hisham Khaled Ben Mahmud Mohsen Ghasemi Curtin University CDT 25098009 MiriSarawakMalaysia Curtin University Kent StreetBentleyPerth6102Australia

Mineral analysis plays a major role in the successful matrix acidizing as it shows the change in physiochemical changes in the formation due to the reaction with fluids *** of the reservoir can be altered by injecting mineral acids during matrix *** various complications are connected during the application of these acids such as environmental hazards,corrosion of pipes and tubings,precipitation of fluosilicates and fast spending of *** mitigate these problems,chelating agents have been applied as an alternative by different *** this study,three different chelating agents EDTA,GLDA and HEDTA were applied to stimulate sandstone and dolomite *** pH value of these chelates ranges from 1.7 to 3 and is measured before and after core flooding to observe physiochemical *** flooding experiments under 180F temperature were performed at a constant flow rate of 1 ml/min on core samples having dimensions(3 inch1.5 inch).Porosity,permeability,Inductively Coupled Plasma(ICP),and TESCAN Integrated Mineral Analysis(TIMA)were employed to measure changes in formation properties such as morphology,topology and *** reacted sample of acids was analyzed for sodium,potassium,calcium,aluminium,magnesium,and iron using the ICP technique to find the capability of these chelates to remove positive *** found to be effective in chelating iron,calcium and magnesium and it also removed some amount of aluminium ions from the sandstone *** and porosity analysis concluded that HEDTA is more efficient in creating new big pore *** analysis confirms that HEDTA is effective in dissolving quartz and other positive ions while dissolved a large amount of calcium and sodium from the sandstone as compared to other *** analysis also concluded that HEDTA is effective in increasing porosity of sandstone formation while GLDA is effective in dolomites.

关键词： sandstone matrix porosity

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Comparative elemental,mineral and microscopic investigation of sandstone matrix acidizing at HPHT conditions

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Petroleum Research 2022年第4期7卷 448-458页

作者： mian Umer shafiq Hisham Khaled Ben Mahmud Lei Wang Khizar Abid Sophia Nawaz Gishkori NFC Institute of Engineering and Technology MultanPakistan Petroleum Engineering Department Faculty of Engineering and ScienceCurtin University MalaysiaCDT 250Sarawak98009Malaysia Energy and Environmental Research Cluster Faculty of Engineering and ScienceCurtin University MalaysiaCDT 250Sarawak98009Malaysia Petroleum Engineering Department Nazarbayev UniversityKazakhstan University of Gujrat Pakistan

Matrix acidizing is usually conducted on sandstone reservoirs to increase hydrocarbon *** plays an important role in designing acidizing treatments to enhance the production of oil and gas from sandstone *** most common acid in practice to acidize sandstone formation is mud acid after the pre-flush acid *** main aim of the pre-flush acid stage is to dissolve positive ions like calcium,potassium,sodium,etc,which can cause precipitation reactions during the mud acid *** research is aimed to investigate the reaction mechanism of a new pre-flush acid combination(hydrochloric acid and acetic acid)with sandstone *** flooding experiments were performed to react acid with the core samples(6 in×1.5 in)under high pressure and temperature(HPHT)condi-tions(80℃and 1000 psia).Analytical techniques such as Tescan Integrated Mineral Analysis(TIMA)have been used to illustrate the effect of these acids on sandstone *** analysis showed that the new acid combination was effective in dissolving various minerals(ankerite,magnetite)and cations(calcium,magnesium,sodium,and iron).15%HCl proved to be more effective in the dissolution of different particles from sandstone core *** dissolved 32.8%of the initial number of particles present inside the sample while the dissolving power of 5%CH_(3)COOH:10%HCl is 26.7%.Subsequently,the number of pores increased by the application of 15%HCl is 22%while that by 5%CH_(3)COOH:10%HCl is 21.8%.Density analysis showed that both acid combinations removed heavy particles effectively,whereas 5%CH_(3)COOH:10%HCl proved more efficient in dissolving calcium ions which is very important for pre-flush acidizing.

关键词： Mineralogy Sandstone HPHT Core flooding TIMA Hydrochloric acid

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Numerical analysis of SiO_(2)-SDS surfactant effect on oil recovery in sandstone reservoirs

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Energy Geoscience 2021年第4期2卷 238-245页

作者： Hisham Ben Mahmud Boon Chu Tan Ausama Giwelli Ali Falah Al-Rubaye mian Umer shafiq Petroleum Engineering Department Faculty of Engineering and ScienceCurtin University MalaysiaCDT 250Sarawak98009Malaysia Energy and Environmental Research Cluster Faculty of Engineering and ScienceCurtin University MalaysiaCDT 250Sarawak98009Malaysia Australian Resources Research Centre CSIROKensingtonAustralia Gudea Geoscience Group(GGSG) Southern RegionIraq NFC Institute of Engineering and Technology MultanPakistan

Currently,the demand for using nanoparticles(NPs)in Enhanced Oil Recovery(EOR)is very *** use of NPs can drastically benefit EOR by changing the rock wettability,improving the mobility of oil phase and decreasing the interfacial tension(IFT)between oil/*** of the previous studies were experimentally conducted and limited to specific operating *** study contributes to the understanding of nanoparticle behaviour at altered operating *** this investigation,a 3-D numerical model of silica nanofluid proposed for EOR is presented.A numerical model of core-scale sandstone was developed using Computer Modelling Group(CMG)-STARS *** developed model was well validated against an experimental *** Silicon Dioxide(SiO_(2))and Sodium Dodecyl Sulphate(SDS)nano-surfactant mixture were injected with different *** optimum concentration of SiO_(2)eSDS solution was obtained at 0.15 wt%with the highest recovery factor of 71.86%***,SiO_(2)eSDS solution injection rate and temperature were investigated and it was found that the optimum operating conditions of injection rate and temperature were 2 cc/min and 60C with the highest recovery *** addition,a heavy crude oil showed a significant increment of oil recovery compared with a light crude with 3.13%and 0.6%,*** intermediate viscosity of used crude oil had the highest oil recovery increment.

关键词： EOR CMG-STARS Numerical modeling SiO_(2)eSDS Flooding

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Mineral analysis of sandstone formation using chelating agents during sandstone matrix acidizing

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Petroleum Research 2023年第3期8卷 404-412页

作者： mian Umer shafiq Hisham Ben Mahmud Lei Wang Momna Khan Ning Qi Khizar Abid Sophia Nawaz Gishkori Department of Chemical and Petroleum Engineering UCSI UniversityMalaysia Chemical and Energy Engineering Department Curtin University MalaysiaCDT 250Miri98009Malaysia Energy and Environmental Research Cluster Faculty of Engineering and ScienceCurtin University MalaysiaCDT 250Sarawak98009Malaysia Petroleum Engineering Deprtment College of EnergyChengdu University of TechnologyChina NFC Institute of Engineering and Technology MultanPakistan School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580PR China Mewbourne School of Petroleum and Geological Engineering University of OklahomaUSA Chemical Engineering Department University of GujratPakistan

For many years,the most common acid practice for sandstone acidizing is based on mud acid and dolomite formations using hydrochloric *** various stages of sandstone acidizing,different acids react with different minerals,and interactions of minerals with acids are an origin for precipitation reactions,which can be possibly deleterious as they may reduce reservoir *** this research,the effects of chelates on pore size distribution,mineralogy,and grain size distribution have been *** chelates(GLDA,HEDTA,EDTA)were examined to react with different Berea Sandstone samples at a temperature of 180F and under 1000 psi confining *** techniques and analysis like Tescan Integrated Mineral Analysis(TIMA),were implemented in this research to understand the effect of chelates on Berea *** results are related to elemental mass,element deportment,mineral mass,mineral locking,grain size distribution,and particle size distribution of the core samples reacted with different chelating *** has been found that all the chelating agents are effective in increasing the porosity and dissolving the cations from the Berea sandstone core *** proved to be more effective in dissolving quartz as compared to other *** proved to be more effective in the dissolution of rutile and zircon *** significance of this research is the application of environment-friendly chelating agents to sandstone ***,the detailed mineral analysis revealed that the most number of particles were dissolved by HEDTA.

关键词： Sandstone Acidizing Berea TIMA Chelates

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Petrophysical interpretations of subsurface stratigraphic correlations,Baram Delta,Sarawak,Malaysia

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Energy Geoscience 2020年第3期1卷 100-114页

作者： Hisham Ben Mahmud Muhammad Hilmi Bin Muhammad Hisham Walid Mohamed Mahmud Van Hong Leong mian Umer shafiq Curtin University Malaysia CDT250Miri98000SarawakMalaysia Emerson Automation Solutions KlangSelangorMalaysia University of Tripoli TripoliLibya Xiamen University Malaysia Jalan SunsuriaBandar Sunsuria43900SepangSelangorMalaysia NFC IET Petroleum and Gas EngineeringMultanPakistan

Petrophysical well log data help to predict hydrocarbon reserves before field development which involves huge financial *** this study,reservoir characterization was performed with a view to obtain information on the geological formation type and petrophysical *** log data obtained from five wells were used to develop a 3D model of X-field in the Baram Delta which was in turn evaluated using the PETREL *** of gamma ray,sonic,density,resistivity and neutron logs aided the delineation and correlation of the sandstone *** hydrocarbon-bearing sands were defined from well log data and divided into two-reservoir zones,shallow and *** correlation assisted in the delineation of the reservoir sands across the *** quality of the reservoir formation was evaluated from average petrophysical properties:with an average thickness of 62 m,an average porosity of 0.19,an average net-to-gross ratio of 0.068,an average V-shale of 0.45,and an average water saturation of 0.95.A rollover anticline structure was identified across the field using the fault as a description *** of petrophysical parameters and uncertainty in the reservoir properties were included to predict the effect on the volume of oil in *** study revealed that the discovered hydrocarbon reserve resource accumulations in the Field X for the fourteen-mapped reservoir sands have a total proven reserve resource estimate of 740MMSTB at P90,655MMSTB at P50 and 593MMSTB at *** A and B are the only intervals with the highest recoverable oil,a volume of 256MMSTB at P90,215MMSTB at P50 and 181MMSTB at P10,*** analyses facilitated an improved reservoir description of shaly sandstone,which contributes to better planning of hydrocarbon re-development and future recovery,and thereby improving the energy supply security of the regions.

关键词： Oil reserve Well logging Effective porosity Shale volume Water saturation Oil saturation

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Modeling and Backstepping-based Nonlinear Control Strategy for a 6 DOF Quadrotor Helicopter

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Chinese Journal of Aeronautics 2008年第3期21卷 261-268页

作者： Ashfaq Ahmad mian China Nanjing 210016 College of Automation Engineering Nanjing University of Aeronautics and Astronautics

In this article,a nonlinear model of an underactuated six degrees of freedom (6 DOF) quadrotor helicopter is derived on the basis of the Newton-Euler formalism. The derivation comprises determining equations of the motion of the quadrotor in three dimensions and approximating the actuation forces through the modeling of aerodynamic coefficients and electric motor dynamics. The derived model composed of translational and rotational subsystems is dynamically unstable,so a sequential nonlinear control strategy is used. The con-trol strategy includes feedback linearization coupled with a PD controller for the translational subsystem and a backstepping-based PID nonlinear controller for the rotational subsystem of the quadrotor. The performances of the nonlinear control method are evaluated by nonlinear simulation and the results demonstrate the effectiveness of the proposed control strategy for the quadrotor helicopter in quasi-stationary flights.

关键词： underactuated systems quadrotor helicopter backstepping control

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Dynamic modeling and nonlinear control strategy for an underactuated quad rotor rotorcraft

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2008年第4期9卷 539-545页

作者： Ashfaq Ahmad mian College of Automation Engineering Nanjing University of Aeronautics and Astronautics Nanjing 210016 China

In this paper, a nonlinear dynamic MIMO model of a 6-DOF underactuated quad rotor rotorcraft is derived based on Newton-Euler formalism. The derivation comprises determining equations of motion of the quad rotor in three dimensions and seeking to approximate the actuation forces through modeling of the aerodynamic coefficients and electric motor dynamics. The derived model is dynamically unstable, so a sequential nonlinear control strategy is implemented for the quad rotor. The control strategy includes exact feedback linearization technique, using the geometric methods of nonlinear control. The performance of the nonlinear control algorithm is evaluated using simulation and the results show the effectiveness of the proposed control strategy for the quad rotor rotorcraft near quasi-stationary flight.

关键词： Quad rotor rotorcraft MIMO model Underactuated systems

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Comparison of the dynamic response of a saturated soil between two models

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Science China Earth Sciences 2004年第6期47卷 551-558页

作者： LIN mian Institute of Mechanics Chinese Academy of SciencesBeijing100080China

By comparing the dynamic responses of saturated soil to Biots and Yamamotos models, the properties of the two models have be pointed out. First of all, an analysis has been made for energy loss of each model from the basic equations. Then the damping of elastic waves in coarse sand and fine sand with loading frequency and soils parameters have been calculated and the representation of viscous friction and Coulomb friction in the two models has been con-cluded. Finally, the variations of loading wave damping and stress phase angles with water depth and soils parameters have been obtained as loading waves range in ocean waves.

关键词： models of marine sediment, elastic waves, phase angles of stress field.

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基于RHT本构模型的连续装药预裂爆破孔距优化研究

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高压物理学报 2025年第1期39卷 109-118页

作者：张伟王建国王勉陶家龙昆明理工大学国土资源工程学院云南昆明650093 云南省教育厅爆破新技术工程研究中心云南昆明650093

为解决北衙金矿在使用预裂爆破技术时整体爆破效果不佳的问题,基于RHT损伤本构模型,利用ANSYS/LS-DYNA数值模拟软件,开展了不同孔距下预裂爆破的数值模拟研究。结果表明:当预裂孔炮孔间距为120 cm时,孔间裂纹存在较为明显的分叉,且裂纹... 详细信息

为解决北衙金矿在使用预裂爆破技术时整体爆破效果不佳的问题,基于RHT损伤本构模型,利用ANSYS/LS-DYNA数值模拟软件,开展了不同孔距下预裂爆破的数值模拟研究。结果表明:当预裂孔炮孔间距为120 cm时,孔间裂纹存在较为明显的分叉,且裂纹扩展范围较大;当炮孔间距为130 cm时,裂纹向四周扩展的范围减小,且炮孔周围岩石的损伤程度明显降低;当炮孔间距增加至140 cm时,相邻预裂孔连线上的裂纹仅在局部连通,无法实现孔间贯穿。上述结果说明,130 cm的炮孔间距在降低预裂爆破自身对岩体的扰动与实现有效爆破成缝之间达到了平衡。基于数值模拟试验结果开展了现场试验,爆破效果良好。研究结果可为矿山的预裂爆破设计和施工提供参考。

关键词：预裂爆破连续装药孔距优化 RHT本构模型

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