Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Nguyen, A.-N.; Mirabel, L.; Duclaux, Laurent; Reinert, Laurence; Dehaudt, P.; Juliaa, J.-F.; Beziat, A.

doi:10.1016/j.clay.2015.03.025

Cited by 7 publications

(4 citation statements)

References 32 publications

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“…The samples used for the SAS experiments were made by pre-compacting the vermiculite powder at a pressure P c = 350 bar or 800 bar, resulting in two different pellet densities. These P c values have been chosen taking into account the results of a previous study on the sealing and mechanical properties of vermiculite gaskets [19]. In use, the gasket has to be compressed at a minimum clamping pressure of 350 bar in order to adopt the shape of the sealing support and minimise the leak at the interface.…”

Section: Samples and High-pressure Cellsmentioning

confidence: 99%

“…In recent works [15,16], we have shown that in situ high-pressure SAS is a powerful method to understand the evolution of the meso-and macropore structure as a function of the working stress in lamellar systems such as expanded graphite. In this paper, we consider vermiculite pellets that, when compressed in the 350-800 bar range, present very good mechanical and sealing properties suitable for industrial use [19]. By high pressure in situ smallangle scattering study, combined with ex situ porosity characterisation methods, we aim to better understand the effect of porosity variation on the mechanical response of these compressed vermiculite pellets.…”

Section: Introductionmentioning

confidence: 99%

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Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

et al. 2019

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The evolution of the pore structure of compressed expanded vermiculite was investigated in situ under uniaxial stress up to 3200 bar using small-angle neutron and X-ray scattering. The studied samples have a lamellar texture in which the presence of oriented oblate pores was revealed by the anisotropic small-angle scattering patterns. The initial pore size distribution and the mechanical behaviour of the pellets at working pressure conditions are strongly related to the applied initial stresses used to pre-compact the vermiculite powder. Our study shows that the porous structure of the pellets was not modified under compression up to the pre-compaction pressure. Higher densification is associated with increasing anisotropy of the pore-matrix interface structure. The pore-matrix interface could be described with fractal geometry. The stress dependence of the system fractal dimension, apparent specific surface area and total porosity was determined and related to the meso-and macropore evolution under uniaxial stress.

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Section: Samples and High-pressure Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

et al. 2019

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“…Under these conditions, the plugging layer loses its effectiveness, resulting in losses and formation damage [13]. Many reports describe plugging materials with high-temperature resistance; these include mica, vermiculite, asbestos, and shell [14][15][16]. ere are many reports such as Alsaba et al [17], Guo et al [18], Li et al [19], Wang et al [20], Guo et al [21], Karcher et al [22], and others of other types of circulation material loss.…”

Section: Introductionmentioning

confidence: 99%

Laboratory Study on a New Composite Plugging Material with High Bearing Strength and High-Temperature Resistance

Lian

Xiong

et al. 2019

Journal of Chemistry

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The reservoir in the Central Tarim Basin is a typical high-pressure fracture-vuggy carbonate reservoir with high temperatures, which easily leads to drilling fluid losses and the high-temperature carbonate. The conventional lost circulation materials (LCMs) cannot meet the reservoir. To resolve this problem, a rigid particle with high-temperature resistance, high acid solubility, and high rigidity was developed, tested, and evaluated. According to bridge rules of 1/2–2/3 opening degree of formation fracture, the formulation experiments of GZD and other lost circulation materials were conducted and a novel composite lost circulation material (LCM) was completed. Lastly, we investigated the compatibility of LCM and mud in site though compatibility experiment, analyzed the plugging effect of the system for fracture and vuggy by laboratory static lost circulation simulation and evaluation and sand-bed plugging experiments, respectively. The results show that compared with the conventional rigid lost material, the value of high-temperature resistance is more and acid solubility is over 98%. Also, it can work well with other fiber materials (E), variable filling particles (F and G), and superfine filling particles (H) and form a novel plugging material, named MGY-I, whose temperature resistance value is more than 473.15 K, the bearing strength is over than 9 MPa, the mud filtrate invasion depth of sand bed made from coarse particles (10∼20 mesh) is only 3.0 cm within 30 minutes, and the invasion depth is less than 1 cm within 30 minutes when the sand bed is made from 80∼100 mesh. The optimal concentrations of rigid granule, lignin fiber, elastic particle, and superfine calcium carbonate are 8% (A : B : CD = 2 : 1 : 1), 0.5%, 6%, and 1%, respectively. And, the plugging function of “GZD-rigidity bridge and filling, fiber network and deformable filing” is better exerted on the formation fracture with a high loading capacity and a high-temperature resistance.

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“…Vermiculite is mainly composed of SiO 2 , Al 2 O 3 , MgO, and Fe 2 O 3 . The material has been extensively studied over the past few years –, showing long term stability and decreasing leak rates with increasing compressive force. Another alternative sealing solution is AFS‐170 (FCM), an alumina felt with low silica content to minimize Si poisoning .…”

Section: Introductionmentioning

confidence: 99%

Performance of Non‐Destructive Compressive Seals for Reversible Solid Oxide Cells

2017

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Contrary to hardened glass ceramics, compressive non‐destructive seals for solid oxide cells (SOCs) could enable stack repairs without utilizing destructive separation methods. In light of increasing interest for high temperature steam electrolysis and energy storage, the performances of two commercially available compressive materials were investigated in humidified gas conditions: Thermiculite‐866 and AFS‐170 alumina felts. Mass loss and thermogravimetric (TGA) experiments carried out in inert, oxidizing, and reducing atmospheres at 800 °C showed no influence of the atmosphere on the alumina felts, and a reversible redox behavior for Thermiculite‐866. Thermiculite‐866 showed better cyclability compared to AFS‐170 during SOC thermal cycling experiments. Initial open circuit voltages in dry H2 were measured and compared to those obtained with commercial mica seals. The highest were recorded with Thermiculite‐866, followed by mica and AFS‐170. The species outgassed by Thermiculite‐866 were quantified, and fluorine was found to be the main component released at 800 °C.

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Room temperature and high temperature sealing properties and compression properties of compressive gaskets made of micrometric vermiculite particles

Cited by 7 publications

References 32 publications

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

Laboratory Study on a New Composite Plugging Material with High Bearing Strength and High-Temperature Resistance

Performance of Non‐Destructive Compressive Seals for Reversible Solid Oxide Cells

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