Wettability measurements of coal using a modified Washburn technique

Tampy, Geatesh; Chen, Wen Jia; Prudich, M.E.; Savage, Robert L.

doi:10.1021/ef00012a010

Cited by 30 publications

(17 citation statements)

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“…The wetting properties of solid materials are of both fundamental and practical importance due to their wide range of applications such as detergency [1], liquid surface coating [2][3][4], flotation [5,6], chemical reactions at solid-liquid interface [7], agrochemicals, flows in reservoirs [8][9][10][11], and mass transfer in packed column [12]. Understanding and characterizing the wettability of solid surfaces are thus highly essential.…”

Section: Introductionmentioning

confidence: 99%

Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes

Chaudhuri

Paria

2009

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes

Chaudhuri

Paria

2009

Journal of Colloid and Interface Science

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“…Although core flooding methods rarely consider the effect of the coal heterogeneity in determination of relative permeability curves, other experimental studies using the sessile drop and captive bubble techniques have demonstrated that coal wettability is dependent on rank (Keller, 1987;Tampy et al, 1988), maceral composition (Arnold and Aplan, 1989;Ding, 2009;Fuerstenau et al, 1983;Ofori et al, 2010), mineralisation (Gosiewska et al, 2002;Susana et al, 2012) and the roughness (Drelich et al, 1996;Li et al, 2013). The sessile drop technique is convenient for the collection of contact angle data on a large number of coal samples, or sites on a sample, but there are limitations when coal wettability effects flow in cleats.…”

Section: Introductionmentioning

confidence: 99%

“…(ii) powdered/pulverised coal. These methods have included: film flotation (Fuerstenau et al, 1983;Hanning and Rutter, 1989;Polat et al, 2003), bubble-particle attachment (Nguyen et al, 1998;Ralston et al, 1999), penetration rate (Murata and Naka, 1983) and capillary rise (or Washburn method) (Tampy et al, 1988).…”

Section: Introductionmentioning

confidence: 99%

The effect of rank, lithotype and roughness on contact angle measurements in coal cleats

Mahoney

Rufford

Johnson

et al. 2017

International Journal of Coal Geology

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“…For bulk coal surfaces these techniques include: captive bubble (illustrated in Figure 2.24) (Arnold and Aplan, 1989;Saghafi et al, 2014;Sakurovs and Lavrencic, 2011), tilted plate (Brady and Gauger, 1940;Yuan and Lee, 2013) and Sessile drop (Drelich et al, 2000;Gutierrez-Rodriguez et al, 1984). For coals that are in powder form, these methods have included: film flotation (Fuerstenau et al, 1983;Hanning and Rutter, 1989;Polat et al, 2003), bubble-particle attachment (Nguyen et al, 1998;Ralston et al, 1999;Ramesh and Somasundaran, 1990), penetration rate (Murata and Naka, 1983) and capillary rise (or Washburn method) (Tampy et al, 1988). (Saghafi et al, 2014).…”

Section: Techniques To Measure and Assess Wettabilitymentioning

confidence: 99%

“…Although core flooding methods rarely consider the effect of the coal heterogeneity in determination of relative permeability curves, other experimental studies using the Sessile drop and captive bubble techniques have demonstrated that coal wettability can be dependent on rank (Keller, 1987;Tampy et al, 1988), maceral composition (Arnold and Aplan, 1989;Ding, 2009;Fuerstenau et al, 1983;Ofori et al, 2010a), mineralisation (Gosiewska et al, 2002b;Susana et al, 2012) and the roughness of the coal surface (Drelich et al, 1996;.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Water Occlusion on Gas Production in Coal

Mahoney¹

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Relative permeability is of fundamental importance to understand and model the flow of hydrocarbons and water in porous rocks including coal, and thus relative permeability is critical in prediction of commercial gas and water production rates from coal seam gas (CSG) reservoirs.Despite relative permeability being a primary parameter for determining reservoir performance, the fundamental physics of how or where water may occlude or block cleats in a coal seam, and thereby interfere with gas production rates, is not fully understood. This project aims to improve the understanding of water occlusion in CSG reservoirs through fluid experiments with model coal cleats and to evaluate the potential impact of water occlusion of reservoir performance.The aim of this thesis is to develop a new experimental methodology that can be used identify the main control factors that affect wettability in coal. There are two key objectives to satisfy the thesis aim 1) develop methods to make artificial channels in coal and 2) create a world first microfluidic device that assess micro scale flow through coal cleats, known as the cleat flow cell (CFC). The initial features to be evaluated will include: lithotype, surface roughness, surface composition, specifically chemical functional groups and pressure. oxygen plasma with a photolithography process to make the desired pattern on coal surface, UV Laser ablation, mechanical machining, a mechanical scratch technique, and a chemical etching technique that used potassium permanganate (KMnO4). Characteristics of the artificial channels were assessed using a surface step profiler, scanning electron microscopy, micro-Raman spectroscopy and light microscopy. A sixth methodology to create an artificial channel using pressed coal powder was also used as a means of evaluating the influence of the surface chemistry on the wetting behaviour, without the interference of surface topography.In Chapter Five, I report the effect of rank and lithotype on the wettability of coal in microfluidic experiments in two types of artificial microchannels; (1) reactive ion etched (RIE) channels and (2) die-cast channels prepared by pressing powdered lithotype concentrates. Contact angles and entry pressures of air and water in the artificial cleats were measured in imbibition experiments performed iii with a CFC. The relative contact angles measured in CFC imbibition experiments were in the range 110 -140° in the RIE channels and 85°-115° in the pressed discs, which are larger contact angles than measured on the flat bulk surfaces of these samples by the conventional sessile drop technique (58°-85°). The CFC observations show that the surface roughness of coal in inertinite-rich dull bands effects contact angle and the entry pressure of the air-water interface differently to the vitrinite-rich bright bands, with both lithotypes presenting unique wetting states. Drainage experiments revealed a thin residual water film on the inertinite cleat wall, not observed on the smoother vitrinite channel. were hydr...

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Wettability measurements of coal using a modified Washburn technique

Cited by 30 publications

References 0 publications

Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes

Dynamic contact angles on PTFE surface by aqueous surfactant solution in the absence and presence of electrolytes

The effect of rank, lithotype and roughness on contact angle measurements in coal cleats

The Effect of Water Occlusion on Gas Production in Coal

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