Portland cement solutions for ultra-high temperature wellbore applications

Pernites, Roderick B.; Santra, Ashok

doi:10.1016/j.cemconcomp.2016.05.018

Cited by 70 publications

(20 citation statements)

References 24 publications

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“…The cements were also examined by XRD to determine their mineralogical composition (Figure S6). For both the control cement and 10 wt % polymer-cement composites cured at 200 °C, the dominant phases observed were xonolite 47 and quartz (due to the additional SiO 2 added) as predicted (see Cement Composite section). SEM/EDS Analysis.…”

Section: ■ Results and Discussionsupporting

confidence: 68%

Polymer-Cement Composites with Self-Healing Ability for Geothermal and Fossil Energy Applications

et al. 2017

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Sealing of wellbores in geothermal and tight oil/gas reservoirs by filling the annulus with cement is a well-established practice. Failure of the cement as a result of physical and/or chemical stress is a common problem with serious environmental and financial consequences. Numerous alternative cement blends have been proposed for the oil and gas industry. Most of these possess poor mechanical properties, or are not designed to work in high temperature environments. This work reports on a novel polymer-cement composite with remarkable self-healing ability that maintains the required properties of typical wellbore cements and may be stable at most geothermal temperatures. We combine for the first time experimental analysis of physical and chemical properties with density functional theory simulations to evaluate cement performance. The thermal stability and mechanical strength are attributed to the formation of a number of chemical interactions between the polymer and cement matrix including covalent bonds, hydrogen bonding, and van der Waals interactions. Self-healing was demonstrated by sealing fractures with 0.3–0.5 mm apertures, 2 orders of magnitude larger than typical wellbore fractures. This polymer-cement composite represents a major advance in wellbore cementing that could improve the environmental safety and economics of enhanced geothermal energy and tight oil/gas production.

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Section: ■ Results and Discussionsupporting

confidence: 68%

Polymer-Cement Composites with Self-Healing Ability for Geothermal and Fossil Energy Applications

et al. 2017

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“…Polymer matrices are thermally degradable at comparatively low temperatures [51,52]. The cement also loses mechanical strength at high temperatures [53], and therefore, modified compounds are required [54]. In contrast, phosphate-bonded ceramics gain mechanical properties after thermal treatment [29].…”

Section: Discussionmentioning

confidence: 99%

0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 Phosphate Composites: Dielectric and Ferroelectric Properties

et al. 2021

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Composite materials with 83 wt.% of the 0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 distributed in phosphate-bonded ceramics were prepared at three different pressures. A phosphate matrix comprises a mixture of an aluminum phosphate binder and melted periclase, MgO. All samples demonstrate a homogeneous distribution of the ferroelectric perovskite phase and are thermally stable up to 900 K. At higher temperatures, the pyrochlore cubic phase forms. It has been found that the density of the composites non-monotonously depends on the pressure. The dielectric permittivity and losses substantially increase with the density of the samples. The fabricated composites demonstrate diffused ferroelectric–paraelectric transition and prominent piezoelectric properties.

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“…At present, there are mainly two ways to improve the mechanical properties and integrity of cement pastes at high temperature: One is to optimize the chemical composition of cement and increase the relative content of high-temperature resistant hydration products in cement hydration products. For example, silica, crystalline silicon, metakaolin, rice husk ash, , slag and fly ash , are added into the cement slurry to reduce the calcium silicon ratio in the cement slurry formula to prevent the strength degradation of the cement sheath. However, the incorporation of a single material has little effect and the cost is relatively high.…”

Section: Introductionmentioning

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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Portland cement solutions for ultra-high temperature wellbore applications

Cited by 70 publications

References 24 publications

Polymer-Cement Composites with Self-Healing Ability for Geothermal and Fossil Energy Applications

Polymer-Cement Composites with Self-Healing Ability for Geothermal and Fossil Energy Applications

0.7Pb(Mg1/3Nb2/3)O3-0.3PbTiO3 Phosphate Composites: Dielectric and Ferroelectric Properties

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

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