Phase change material microcapsules for smart temperature regulation of drilling fluids for gas hydrate reservoirs

Zhao, Xin; Geng, Qi; Zhang, Zhen; Qiu, Zhengsong; Fang, Qingchao; Wang, Zhiyuan; Yan, Chuanliang; Ma, Yongle; Li, Yang

doi:10.1016/j.energy.2022.125715

Cited by 33 publications

(9 citation statements)

References 42 publications

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“…The coal molecular model exhibited strong physical heterogeneity. The coal matrix pore surface was composed of a mixture of adsorption sites, which had high energy and low energy and influenced the adsorption of the gas components and the overall amount of gas adsorbed (Gao et al, 2023). Because CO 2 has a greater adsorption capacity on the coal pore surface than does CH 4 (Sander et al, 2020), the coal substrate surface was more likely to adsorb CO 2 , which weakened the interactions between the coal matrix and CH 4 .…”

Section: Simulation Scheme and Parameter Settingmentioning

confidence: 99%

Molecular simulations of the effects of CO2 and N2 injection on CH4 adsorption, coal porosity and permeability

Pan,

Jiao,

Wang

et al. 2024

Adv. Geo-Energy Res.

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Section: Simulation Scheme and Parameter Settingmentioning

confidence: 99%

Molecular simulations of the effects of CO2 and N2 injection on CH4 adsorption, coal porosity and permeability

Pan,

Jiao,

Wang

et al. 2024

Adv. Geo-Energy Res.

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“…However, as a result of the challenging geological environments, when drilling in the hydrate-bearing formations submerged in deep water, MHs may be partly dissociated due to the heat transfer between the thermal drilling fluids and gas hydrates. 5,7 The dissociation can result in wellbore instabilities, sediment deformation, and fine migration, leading to complicate and severe troubles in drilling and production operations. 8−14 Regarding MH production, depressurization is considered as the most economically feasible technology.…”

Section: Introductionmentioning

confidence: 99%

“…Drilling in hydrate sediments safely and efficiently has been the key focus of researchers. However, as a result of the challenging geological environments, when drilling in the hydrate-bearing formations submerged in deep water, MHs may be partly dissociated due to the heat transfer between the thermal drilling fluids and gas hydrates. , The dissociation can result in wellbore instabilities, sediment deformation, and fine migration, leading to complicate and severe troubles in drilling and production operations. − Regarding MH production, depressurization is considered as the most economically feasible technology. , However, ice and secondary hydrate formation may occur and block the flow channel to reduce the gas/fluid production during the dissociation process when the depressurization method is used individually because the hydrate decomposition is an endothermic reaction. − Thermal-stimulation technology is an effective method to promote hydrate dissociation. Regarding the thermal-stimulation method, improving the thermal efficiency and energy ratio is the key, which is considered to be related to heat supply and heat transfer. − Consequently, it is essential to clarify the heat flow-induced decomposition in different hydrate systems.…”

Section: Introductionmentioning

confidence: 99%

NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

Li,

Huang,

Sun

et al. 2024

Energy Fuels

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Clarifying the heterogeneity of methane hydrate (MH) formation and decomposition induced by heat flow in different hydrate deposits is of critical importance for gas hydrate drilling and exploitation operations. In this paper, two sand packing samples with different sizes of 250−270 and 96−109 μm, respectively, were adapted to prepare hydratebearing sediments (HBSs), and a low-field nuclear magnetic resonance (LF-NMR) system was employed and modified by combining a gas/water two-phase flow system to quantitatively and visually study the heterogeneity of MH formation/dissociation in the two sand samples during the heat flow invasion. Results showed that methane hydrate formed heterogeneously in porous media, and MH formation rates were negatively correlated with the particle sizes of the sediments. In the whole process of heat injection, uneven distributions of hydrate saturation with low left and high right were shown in the two samples, suggesting that it was difficult for the heat to transfer over long distances. In this process, the dissociation rate of methane hydrate was related to the fluid flow resistance and heat supplement simultaneously, and hydrate decomposition induced by heat stimulation could be accelerated with the increase in the size of quartz sand, which was composed of HBSs. Additionally, the hydrate dissociation fronts expanded with distinct patterns for the hydrate sediments with different sand sizes. When hot water was injected into the HBS filled with larger grains, MH preferentially dissociated in the bottom and inlet parts of the chamber, and the MH decomposition front expanded with a wedge-shaped pattern. In the sediment with smaller grain size, MH was given priority to dissociate from the middle to the edge sides along the coronal planes (X−Z planes) because injected water could be hindered to transfer along a radial direction by the tight seepage channel.

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“…In recent years, the global economy has entered a new development cycle, leading to a sharp increase in the demand for petroleum and natural gas resources worldwide [1][2][3]. Confronted with substantial energy needs, there is a growing focus on unconventional oil and gas resources.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Aminated Nano-Silica as a Novel Shale Stabilizer to Improve Wellbore Stability

Li,

Xu,

Pei

et al. 2024

Materials

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The issue of wellbore instability poses a significant challenge in the current exploration of shale gas reservoirs. Exploring more efficient shale stabilizers has always been a common goal pursued by researchers. In this paper, a novel shale stabilizer, denoted as ANS, was prepared by employing a silane-coupling modification method to graft (3-Aminopropyl) triethoxysilane (APTES) onto the surface of nano-silica. The structure of ANS was characterized through Fourier transforms infrared spectroscopy (FT-IR), thermo-gravimetric analysis (TGA), and particle size tests (PST). The shale stabilizing properties of ANS were evaluated through tests such as pressure penetration, BET analysis, hydration expansion and dispersion. Furthermore, the interaction between ANS as a shale stabilizer and clay was explored through clay zeta potential and particle size analysis. The results indicated that ANS exhibited a stronger plugging capability compared to nano-silica, as evidenced by its ability to increase the shale pressure penetration time from 19 to 131 min. Moreover, ANS demonstrated superior hydration inhibition compared to commonly used KCl. Specifically, it reduced the expansion height of bentonite from 8.04 to 3.13 mm and increased the shale recovery rate from 32.84% to 87.22%. Consequently, ANS played a dual role in providing dense plugging and effective hydration inhibition, contributing significantly to the enhancement of wellbore stability in drilling operations. Overall, ANS proved to be a promising shale stabilizer and could be effective for drilling troublesome shales.

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Phase change material microcapsules for smart temperature regulation of drilling fluids for gas hydrate reservoirs

Cited by 33 publications

References 42 publications

Molecular simulations of the effects of CO2 and N2 injection on CH4 adsorption, coal porosity and permeability

Molecular simulations of the effects of CO2 and N2 injection on CH4 adsorption, coal porosity and permeability

NMR Investigation of Methane Hydrate Formation and Dissociation Behavior Induced by Heat Flow in Sandy Porous Media

Evaluation of Aminated Nano-Silica as a Novel Shale Stabilizer to Improve Wellbore Stability

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