Mechanical properties and mechanism of wollastonite fibers reinforced oil well cement

Zhang, Chunmei; Hao, Xin; Cheng, Xiaowei; Guo, Xiaolu

doi:10.1016/j.conbuildmat.2020.120461

Cited by 27 publications

(11 citation statements)

References 46 publications

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“…The average value of five samples in each group was taken as strength data. 34 The tensile strength test was carried out according to the Brazilian splitting tensile test method, 35 the splitting tensile strength of the columnar (Φ 50.8 mm × 25.4 mm) cement stone was tested using the TY-300 pressure testing machine. Four samples were tested in each group and their average value was taken as the final strength.…”

Section: Experimental Methodsmentioning

confidence: 99%

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

2022

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Under the condition of heavy oil thermal recovery, the cement sheath is easy to crack in the high temperature environment, resulting in the decrease of cement paste strength, which may further cause sealing failure and oil and gas production safety accidents. In this paper, the influence of graphite on the mechanical properties of cement paste under the simulated thermal recovery of heavy oil was studied, and its mechanism is explored by testing and analyzing the microstructure. The phase composition and microstructure of graphite–cement composites were determined by X-ray diffraction analysis (XRD) and scanning electron microscope (SEM), and the thermogravimetric analyzer (TG/DTG) was used to analyze the heat resistance of the graphite–cement composites. The results show that the addition of graphite significantly improved the strength and deformation resistance of the Class G oil well cement at high temperature (300, 400, and 500 °C) and low temperature (50 °C), and the optimal addition amount is 0.07%. The microscopic analysis shows that the incorporation of graphite promoted the formation of hydration products, and played a role in filling pores and reducing microcracks in cement pastes. At the same time, due to the better thermal conductivity of graphite, it can balance the internal thermal stress of the cement pastes and inhibit the strength decline of cement pastes under high temperature environments. The integrity of cement pastes was guaranteed through the mechanism of “crack deflection” and “crack bridging”. The research results of this paper have presented a certain theoretical basis and new ideas for the development of cementing slurry systems in heavy oil thermal recovery wells.

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Section: Experimental Methodsmentioning

confidence: 99%

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

2022

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“…The reason is that CF reacts with C-H to form C-S-H, which reduces the layered C-H content and improves the strength of the cement paste. This explains why the compressive strength, tensile strength, and ultimate strain of the cement paste have been improved after adding CF treated with concentrated nitric acid [26]. Figure 6 presents the infrared spectra of the CFreinforced cement stone treated with nitric acid, CFreinforced cement stone treated with sodium hypochlorite, and pure cement stone.…”

Section: Mechanicalmentioning

confidence: 97%

Mechanical Properties and Enhancement Mechanism of Oil-Well Cement Stone Reinforced with Carbon Fiber Surfaces Treated by Concentrated Nitric Acid and Sodium Hypochlorite

Zhang

et al. 2020

International Journal of Polymer Science

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In this study, carbon fibers (CFs) were used as toughening materials to improve the mechanical properties of cement stone. The surfaces of the CFs were treated with concentrated nitric acid and sodium hypochlorite to increase the interfacial adhesion between the CFs and the cement. The CFs subjected to surface treatment were evaluated by scanning electron microscopy and infrared analysis to find a significant increase in the number of oxygen-containing groups on the surface. The CFs subjected to surface treatment were added to the cement matrix. The effect of the modified CFs on the mechanical properties of the cement matrix was evaluated by testing the means of mechanical properties. The maximum tensile strength, maximum compressive strength, and ultimate strain of the enhanced cement stone of the CFs treated with sodium hypochlorite increased by 68.2%, 12.0%, and 4.4%, respectively. The maximum tensile strength, maximum compressive strength, and ultimate strain of the enhanced cement stone of the CFs treated with concentrated nitric acid increased by 72.7%, 14.7%, and 4.5%, respectively. The addition of CFs to the cement stone exerted no effect on the type of cement hydration products, as determined by infrared analysis and X-ray diffraction. The toughening mechanism of the modified CFs added to the cement stone was ultimately explored, and the bridging effect, deflection effect, and pull-out effect of cracks were evaluated.

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“…Additionally, this crystalline phase can improve the toughness and strength of the GFs prepared with clay. 23…”

Section: Volumetric Expansion Average Pore Diameter Density and Micro...mentioning

confidence: 99%

Glass foam of high compressive strength produced from photovoltaic module waste glass, eggshell, and clay

Brykalski

Machado

Camaratta

et al. 2023

Int J Applied Ceramic Tech

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A glass foam (GF) of high specific compressive strength (12.17±1.91 MPa g−1 cm−3) and low thermal conductivity (.121±.001 Wm−1 K−1) was produced from waste glass of photovoltaic module, eggshells, and bentonite clay. The influences of the amount of clay and heat‐treatment temperature on the GFs final properties were assessed. X‐ray diffraction results and the data of microscopic analyses demonstrated that addition of clay affected the structure and porosity of the GFs, and consequently their mechanical properties. On the basis of the mechanical property (density), the GF that composed of 80% waste glass, 10% clay, and 10% eggshell at the sintering temperature of 900°C was the best. The GFs reported in this study could serve as promising insulators in situations where high load support is required.

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Mechanical properties and mechanism of wollastonite fibers reinforced oil well cement

Cited by 27 publications

References 46 publications

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

Mechanical Properties of Graphite-Oil Well Cement Composites under High Temperature

Mechanical Properties and Enhancement Mechanism of Oil-Well Cement Stone Reinforced with Carbon Fiber Surfaces Treated by Concentrated Nitric Acid and Sodium Hypochlorite

Glass foam of high compressive strength produced from photovoltaic module waste glass, eggshell, and clay

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