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Combined use of fly ash and silica to prevent the long-term strength retrogression of oil well cement set and cured at HPHT conditions

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Petroleum Science 2024年第2期21卷 1122-1134页

作者： Guo-Dong Cheng Xue-Yu Pang Jin-Sheng Sun Zheng-Song Qiu Chuang-Chuang Wang Jian-Kun Qin Ning Li School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina National Key Laboratory of Deep Oil and Gas China University of Petroleum(East China)Qingdao266580ShandongChina Oil and Gas Engineering Research Institute(Tarim Oilfield Company) China National Petroleum CorporationTarim841000XinjiangChina

The long-term strength retrogression of silica-enriched oil well cement poses a significant threat to wellbore integrity in deep and ultra-deep wells, which is a major obstacle for deep petroleum and geothermal energy development. Previous attempts to address this problem has been unsatisfactory because they can only reduce the strength decline rate. This study presents a new solution to this problem by incorporating fly ash to the traditional silica-cement systems. The influences of fly ash and silica on the strength retrogression behavior of oil well cement systems directly set and cured under the condition of 200°C and 50 MPa are investigated. Test results indicate that the slurries containing only silica or fly ash experience severe strength retrogression from 2 to 30 d curing, while the slurries containing both fly ash and silica experience strength enhancement from 2 to 90 d. The strength test results are corroborated by further evidences from permeability tests as well as microstructure analysis of set cement. Composition of set cement evaluated by quantitative X-ray diffraction analyses with partial or no known crystal structure(PONKCS) method and thermogravimetry analyses revealed that the conversion of amorphous C-(A)-S-H to crystalline phases is the primary cause of long-term strength *** addition of fly ash can reduce the initial amount of C-(A)-S-H in the set cement, and its combined use with silica can prevent the crystallization of C-(A)-S-H, which is believed to be the working mechanism of this new admixture in improving long-term strength stability of oil well cement systems.

关键词： fly ash Long-term strength retrogression High temperature Quantitative X-ray diffraction(QXRD) Partial or no known crystal structure(PONKCS)

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Study on fly ash Based Porous Ceramsite as Biological Filter Media

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Agricultural Biotechnology 2024年第1期13卷 71-73页

作者： Ruigang WANG Shuo WANG Weijie LI Hailong LIU Shanxi Laboratory for Yellow River School of Environment and ResourcesShanxi UniversityTaiyuan 030006China

Using fly ash as a raw material,porous ceramic particles with an apparent density of 1.21 g/cm^(3),a visible porosity of 51.03%,and a specific surface area of 4.26 m^(2)/g were prepared and used as biofilter materials for wastewater *** SEM,XRD analysis,and heavy metal leaching analysis,it was found that porous ceramsite were porous materials with rough *** calcination,the newly formed mineral was silicate calcium *** heavy metal concentration in the leaching solution of porous ceramsite met the national surface water quality *** treatment of domestic sewage showed that the volumetric loads of COD Cr,NH_(4)^(+)-N,and TN removed by the aerated biofilter were 5.23,0.98,and 0.35 kg/(m^(3)·d),respectively,with removal rates of 85.46%,96.13%,and 32.31%.

关键词： Porous ceramsite Domestic sewage fly ash

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Study of the reinforced mechanism of fly ash on amphiphilic polymer gel

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Petroleum Science 2022年第5期19卷 2175-2184页

作者： Bo-Bo Zhou Wan-Li Kang Hong-Bin Yang Zhe Li Li-Ping Ma Shi-Tou Wang Jia-Qi Wang An-Qing Xie Bauyrzhan Sarsenbekuly Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdao266580ShandongPR China School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongPR China Oil and Gas Technology Research Institute Changqing Oilfield Branch CompanyPetroChinaXi'an710018ShaanxiPR China Kazakh-British Technical University Almaty050000Kazakhstan

Amphiphilic polymer gels are widely used in heterogeneous reservoirs for conformance control ***,in high temperature and high salinity of calcium and magnesium reservoirs,amphiphilic polymer gels cannot maintain effective *** this work,a novel reinforced amphiphilic polymer gel(F-PADC gel)was prepared by physically mixing polymer solution and fly ash(FA),which is an extremely low cost *** viscoelasticity and stability of the F-PADC gel were studied by rheometry and *** reinforced mechanism of FA on amphiphilic polymer gels was *** results show that the addition of FA can make the gel more robust with a denser network *** the fifth day,the elastic modulus(G’)increases from 5.2 to 7.0 Pa and the viscosity modulus(G")increases from 0.4 to 0.6 Pa at the frequency of 1 Hz,which improves the viscoelasticity of the gel *** importantly,the F-PADC gel does not degrade after aging at 85℃for 180 *** its viscoelasticity increases obviously,G′and G"increase to 110.0 Pa and 3.5 Pa,respectively,showing excellent anti-aging ***,FA amphiphilic polymer gels have a good injectivity and a perfect plugging rate of 98.86%,which is better than that of sole amphiphilic polymer *** novel mixed FA amphiphilic polymer gels can prove to be a better alternative to conventional polymer gels to enhance oil recovery in high temperature and high salinity reservoirs.

关键词： Reinforced amphiphilic polymer gel fly ash Anti-aging stability Conformance control

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Investigation on the effects of fluid intensification based preconditioning process on the decarburization enhancement of fly ash

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Chinese Journal of Chemical Engineering 2022年第4期35卷 275-283页

作者： Danlong Li Yannan Liang Hainan Wang Ruoqian Zhou Xiaokang Yan Lijun Wang Haijun Zhang National Engineering Research Center of Coal Preparation and Purification China University of Mining and TechnologyXuzhou 221116China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116China School of Electrical and Engineering China University of Mining and TechnologyXuzhou 221116China

fly ash(FA)is a complex and abundant solid waste created by humans,and has caused environmental issues,for which flotation is an effective technique employed before its comprehensive ***,the complex and hydrophilic characteristics of FA particles cannot naturally fulfill the selective separation by common ***,this study aims to provide an insight into fluid intensification effects on flotation to achieve the enhancement of FA surface property and *** relevant effects and mechanisms are investigated,based on the measurements of zeta potential,infrared spectroscopy,contact/wrap angle,induction time,size distribution and scanning electron microscopy–energy dispersive *** results manifested that the maximum unburned carbon recovery(73.25%)and flotation rate(0.2037 s^(-1)) were achieved with preconditioning energy inputs of 14.23 and6.57 W·kg^(-1) *** increasing preconditioning energy inputs,fluid intensification effects could promote the inter-particle collision/attrition,detachment of hydrophilic existence and collector adsorption on ***,absorbance of some hydrophobic and hydrophilic functional groups was strengthened and weakened respectively,which accounted for the improved interfacial properties,reflected as the increased contact and wrap angles,together with declined induction ***,this article revealed the positive influences of fluid intensification based preconditioning process on rendering particle surface hydrophobic and improving separation performance.

关键词： fly ash Waste treatment Preconditioning energy input Fluid intensification Flotation Kinetic modeling

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Molecular mechanism of fly ash affecting the performance of cemented backfill material

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International Journal of Minerals,Metallurgy and Materials 2023年第8期30卷 1560-1572页

作者： Shuo Yang Jiangyu Wu Hongwen Jing Xinguo Zhang Weiqiang Chen Yiming Wang Qian Yin Dan Ma State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China Shandong Key Laboratory of Mining Disaster Prevention and Control Shandong University of Science and TechnologyQingdao 266590China State Key Laboratory of High Performance Civil Engineering Materials Jiangsu Research Institute of Building Science Co.Ltd.Nanjing 210008China Department of Materials University of OxfordParks RdOxfordOX13PHUnited Kingdom Department of Mechanical Aerospace and Civil EngineeringSchool of EngineeringThe University of ManchesterManchester M139PLUnited Kingdom School of Mines China University of Mining and TechnologyXuzhou 221116China

The great challenge of cemented tailings backfill(CTB)is difficult simultaneously maintaining its excellent mechanical properties and low *** ash(FA)can potentially address this problem and further replace cement in favor of low carbon ***,its mechanism on CTB with low cement dosage and low Ca system remains ***,this study conducted uniaxial compression,Xray diffraction(XRD),and scanning electron microscopy(SEM)-energy dispersive spectrometer(EDS)tests to investigate the effect of FA dosage on the mechanical property and microstructure of CTB.A molecular model of FA-CSH was constructed to reproduce the molecular structure evolution of CTB with FA based on the test *** influences of FA dosage and calcium/silica molar ratio(Ca/Si ratio)on the matrix strength and failure model were analyzed to reveal the mechanism of FA on calcium silicate hydrated(C-S-H).The results show that the strength of CTB increases initially and then decreases with FA dosage,and the FA supplement leads to a decrease in Ca(OH)_(2) diffraction intensity and Ca/Si ratio around the FA *** and SEM-EDS findings show that the Ca/Si ratio of C-S-H decreases with the progression of *** FA-CSH model indicates that FA can reinforce the silica chain of C-S-H to increase the matrix ***,this enhancement is weakened by supplementing excessive FA *** addition,the hydrogen bonds among water molecules deteriorate,reducing the matrix strength.A low Ca/Si ratio results in an increase in water molecules and a decrease in the ionic bonds combined with Ca^(2+).The hydrogen bonds among water molecules cannot withstand high stresses,resulting in a reduction in *** water absorption of the FA-CSH model is negatively correlated with the FA dosage and Ca/Si *** use of optimal FA dosage and Ca/Si ratio leads to suitable water absorption,which further affects the failure mode of FA-CSH.

关键词： fly ash cemented tailings backfill calcium/silica ratio microstructure molecular dynamics simulation

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Fabrication of a flexible microwave absorber sheet based on a composite filler with fly ash as the core filled silicone rubber

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International Journal of Minerals,Metallurgy and Materials 2023年第3期30卷 548-558页

作者： Qiuying Li Yiheng Lu Zhuoyan Shao Polymer Processing Laboratory School of Material Science and EngineeringEast China University of Science and TechnologyShanghai 200237China

A new type of composite filler was designed by a modified sol-gel method using fly ash(FA),Fe(NO_(3))_(3)·9H_(2)O,and Ni(NO_(3))_(2)·6H_(2)O as raw *** composite filler was a spherical core-shell structure composed of FA as the core and NiFe_(2)O_(4)as the ***,the composite filler was added into the silicone rubber to fabricate the high temperature vulcanized microwave absorption materials;X-ray diffraction,fourier transform infrared spectroscopy,X-ray photoelectron spectroscopy,and scanning electron microscope confirmed that NiFe_(2)O_(4)was successfully coated on the surface of FA and formed a uniform and continuous coating *** expected,silicone rubber filled with the composite filler had a minimum reflection loss of-23.8 dB at 17.5 GHz with the thickness of 1.8 mm,while the effective absorption bandwidth was as high as 12 *** addition of the composite filler greatly enhanced the microwave absorption properties of the system,which was resulted from multiple losses mechanism:interface polarization losses,magnetic losses,and multiple reflection ***,silicone rubber filled with the composite filler exhibited excellent thermal stability,flexibility,environmental resistance,and hydrophobicity compared with traditional silicone ***,this work not only responds to the green chemistry to achieve efficient FA recovery,but also devises a new strategy to prepare microwave absorption materials with strong potential for civilian applications.

关键词： fly ash microwave absorption silicone rubber multiple losses mechanism

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Fresh and hardened properties of high-performance fiber-reinforced concrete containing fly ash and rice husk ash:Influence of fiber type and content

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Frontiers of Structural and Civil Engineering 2022年第12期16卷 1621-1632页

作者： Nguyen-Trong HO Viet Quoc DANG Minh-Hieu NGUYEN Chao-Lung HWANG Trong-Phuoc HUYNH Faculty of Civil Engineering VSB-Technical University of OstravaOstrava-Poruba 70800Czech Republic Faculty of Bridge and Road Construction Mientrung University of Civil Engineering(MUCE)Tuy Hoa City 56100Vietnam Vinh Long Department of Construction Vinh Long City 85000Vietnam Taiwan Building Technology Center Taiwan University of Science and TechnologyTaipei 10607China Faculty of Civil Engineering College of EngineeringCan Tho UniversityCan Tho City 94000Vietnam

Although fibers are used only infrequently as an additive in concrete in the construction industry,fiberenhanced concrete is known to provide a wide range of advantages over conventional *** main objective of this study was to investigate the influences of fiber type and content on the mechanical properties and durability of highperformance fiber-reinforced concrete(HPFRC)designed using a novel densified mixture design algorithm with fly ash and rice husk *** types of fiber,including polypropylene(PP)fiber,steel fiber(SF),and hybrid fiber(HF),were *** on the results,the inclusion of fibers decreased HPFRC flowability,regardless of fiber *** the compressive strength of HPFRC with 1.6%PP fiber content was 11.2%below that of the reference HPFRC specimen at 91 d of curing age,the 91-d compressive strengths of both SF and HF-enhanced HPFRC specimens were significantly better than that of the reference HPFRC ***,the HPFRC specimens incorporating SF and HF both exhibited better splitting tensile and flexural strengths as well as less drying shrinkage than the HPFRC specimens incorporating PP ***,the fiber-enhanced specimens,especially those with added SF,registered less surface electrical resistivity and greater vulnerability to chloride ion penetration than the reference HPFRC specimen.

关键词： high-performance fiber-reinforced concrete fly ash rice husk ash durability mechanical strength

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In situ synthesis of MIL-53-type eco-MOF from high-alumina fly ash for efficiently removing fluoride from water

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Progress in Natural Science:Materials International 2023年第5期33卷 681-690页

作者： Ning Yuan Kaiqi Tan Qiuyu Li Xinling Zhang Yixiang Bao State Key Laboratory of Water Resource Protection and Utilization in Coal Mining National Institute of Clean and Low Carbon Energy School of Chemical and Environmental Engineering China University of Mining and Technology

Facing ubiquitous fluoride pollution in aquatic environments and ever-increasing discharge of coal fly ashes,this study aims to in situ synthesize a kind of Al-based metal-organic framework eco-material(eco-MOF) using highalumina fly ash as metal raw material,and apply the obtained adsorbent to efficiently adsorb fluoride in *** synthesized eco-MIL-53(Al) exhibits excellent thermal stability,showcasing a consistent morphology of fine columnar crystals and possessing a high specific surface area(353 m2·g-1).Moreover,the adsorption isotherm demonstrates a strong agreement with the Langmuir isotherm model,indicative of a maximum uptake quantity of160 mg·g-1at 318 *** addition,fluoride adsorption experiments demonstrate that an increased dosage enhances the adsorption efficiency,the higher water pH value diminishes the removal efficiency,and the impact of coexisting anions is ***,the adsorption capacity is augmented with increasing temperature at high initial fluoride concentrations,but shows negligible variation at low initial fluoride *** is worth noting that the desiliconization filtrate can be applied to synthesize ZSM-5 zeolite,realizing the total utilization of fly *** present work provides a novel platform that would serve as a mutually beneficial reference for managing the environmental risks of fluoride and waste resource utilization.

关键词： Fluoride fly ash Defluoridation Metal-organic frameworks Adsorption

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Phase evolution and properties of glass ceramic foams prepared by bottom ash,fly ash and pickling sludge

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 563-573页

作者： Junjie Zhang Xiaoyan Zhang Bo Liu Christian Ekberg Shizhen Zhao Shengen Zhang Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Shunde Graduate School University of Science and Technology BeijingFoshan 528399China Nuclear Chemistry and Industrial Material Recycling Department of Chemistry and Chemical EngineeringChalmers University of TechnologyGothenburg 41296Sweden

Municipal solid waste incineration products of bottom ash(BA),fly ash(FA),and pickling sludge(PS),causing severe environ-mental pollution,were transformed into glass ceramic foams with the aid of CaCO3 as a pore-foaming agent during *** effect of the BA/FA mass ratio on the phase composition,pore morphology,pore size distribution,physical properties,and glass structure was investigated,with results showing that with the increase in the BA/FA ratio,the content of the glass phase,Si-O-Si,and Q3Si units decrease *** glass transmission temperature of the mixture was also *** combined,the glass viscosity decreases,causing bubble coalescence and uneven pore *** ceramic foams with uniform spherical pores are *** the content of BA,FA,and PS are 35wt%,45wt%,and 20wt%,respectively,contributing to high performance glass ceramic foams with a bulk density of 1.76 g/cm3,porosity of 56.01%,and compressive strength exceeding 16.23 *** versatile and low-cost approach provides new insight into synergistically recycling solid wastes.

关键词： glass ceramic foams bottom ash fly ash picking sludge pore structure glass units

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Study on Triaxial Mechanical Properties and Micro Mechanism of fly ash Reinforced Cement Calcareous Sand

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Journal of Renewable Materials 2022年第6期10卷 1693-1710页

作者： Ben Li Na Li Chulei Fang Jun Hu Rong Yu Longxin Shu Kai Yao Fang Zhang School of Civil Engineering Shaoxing UniversityShaoxing312000China College of Civil Engineering and Architecture Hainan UniversityHaikou570228China School of Qilu Transportation Shandong UniversityJinan250002China

In order to study the mechanical properties and micro-mechanism of industrial waste fly ash-reinforced cement calcareous sand(FCS),the triaxial unconsolidated undrained(UU)test and scanning electron microscope tests(SEM)were carried out on *** results of UU test show that the peak stress and energy dissipation of the FCS sample first increase and then decrease with the increase in fly ash *** ash enhances the cement calcareous sand by increasing both the cohesion and internal friction angle,and adding 10%content of fly ash gives the largest *** SEM test results shows that the hydration products of cement and fly ash filled the pores and cracks on the surface of the calcareous sand,which increased the compactness and structure of the FCS *** porosity of cement calcareous sand can be reduced from 27.6%to 12.8%by adding 10%fly ash.A brittleness evaluation index based on energy dissipation is proposed to quantitatively characterize the brittleness of FCS *** results show that when the content of fly ash is 5%,the brittleness of FCS samples is the *** study shows that the mechanical properties of cement calcareous sand can be effectively enhanced by adding the appropriate amount of fly ash.

关键词： Calcareous sand cement fly ash triaxial UU test SEM test

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