Rheological behavior of oil-based drilling foams

Sherif, Testi; Ahmed, Ramadan; Shah, Subhash; Amani, Mahmood

doi:10.1016/j.jngse.2015.07.022

Cited by 19 publications

(6 citation statements)

References 26 publications

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“…The factors that affect foam stability include foam quality, surfactant concentration, pH, temperature, impurities, presence of polymers, foam generation method, surface tension, and base fluid type [4,7,8]. The quality of foam is the most critical factor in determining its stability.…”

Section: Introduction 1overview Of Foammentioning

confidence: 99%

“…This is due to the increased viscous resistance of the thin-film network in dry foams. The structure of foam varies with quality because the amount of the available liquid phase determines the liquid film structure and thickness [7,8,10]. The transition from wet to dry foam causes a structural change from spherical to polyhedral shape [11].…”

Section: Introduction 1overview Of Foammentioning

confidence: 99%

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The Effect of Salt on Stability of Aqueous Foams

Obisesan¹,

Ahmed²,

Amani³

2021

Energies

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The properties of foams are often affected by environmental variables such as salt contamination. The objective of this study is to investigate the impact of salt on the drainage behavior of aqueous foams. To accomplish this objective, drainage experiments were conducted on aqueous foams. Test variables were foam quality (40–65%), and salt content (0% to 18%), and type. To investigate drainage, the foam was generated in a flow loop and trapped in a vertical test section. Then, the pressure profile in the foam column was measured using ten pressure sensors. Foam drainage is determined as a function of time using measured pressure profiles. The results show that the drainage of NaCl-containing foams decreased with foam quality, whereas the CaCl2-containing foams did not exhibit a clear trend with foam quality. The effect of salt content on foam rheology was minimal.

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Section: Introduction 1overview Of Foammentioning

confidence: 99%

Section: Introduction 1overview Of Foammentioning

confidence: 99%

The Effect of Salt on Stability of Aqueous Foams

Obisesan¹,

Ahmed²,

Amani³

2021

Energies

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“…At the same time, the aqueous foam is no longer applicable in water-sensitive formations, such as shale or tight reservoirs, which can significantly reduce the effectiveness of the foam and cause reservoir damage. 36,37 In general, the current aqueous foam systems have limited application.…”

Section: Introductionmentioning

confidence: 99%

“…They observed only hydrocarbon defoaming behavior through visualization models, and even though the recovery was improved, reducing large-scale defoaming was still difficult. At the same time, the aqueous foam is no longer applicable in water-sensitive formations, such as shale or tight reservoirs, which can significantly reduce the effectiveness of the foam and cause reservoir damage. , In general, the current aqueous foam systems have limited application.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Features of Nonaqueous Foam in Fracture Systems

Zhao

et al. 2023

Energy Fuels

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The use of foam as a fluid for gas mobility control has become increasingly popular due to its effectiveness. However, the destabilization of aqueous foam by oil has led to a growing interest in nonaqueous foam. Despite this, there have been limited studies on the dynamic features of nonaqueous foam in fractures. In this study, we investigate the impact of roughness and fracture width on the flow behavior of non-aqueous foam using both microscopic visualization and macroscopic core flooding techniques. We also uncover the regeneration and regulation mechanisms of non-aqueous foam, while establishing a control group of aqueous foam for comparative purposes. Our experimental results show that as the roughness of the fracture increases, the pressure difference generated by both foams also increases, but decreases as the fracture width increases. Moreover, the optimal gas–liquid ratio for aqueous foam is 2:1, while that of nonaqueous foam is 1:2. Nonaqueous foam tends to be captured and deformed when transported through rough fracture surfaces. This deformation causes necking separation, which eventually leads to the generation of new foam. Furthermore, roughness anchors the foam, prolonging its stay in the fracture and increasing seepage resistance. The presence of kerosene in the fractured shale core reduces the stability of nonaqueous foam, as evidenced by a ∼23.3% decrease in differential pressure.

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“…The most widely used rheometer types are parallelplate rheometers (Figure 2.11c) (Neff and Macosko, 1996, Herzhaft, 2002, Arif et al, 2012, Costa et al, 2013a and pipe viscometers (i.e. capillary viscometers) (Herzhaft et al, 2005, Zhao et al, 2009, Sherif et al, 2015. During measurement using a parallel-plate rheometer, the gap between the two plates is filled with foam, either as a monolayer or a multilayer.…”

Section: Measurement Of Foam Rheologymentioning

confidence: 99%

An investigation of flotation froth rheology

Li¹

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Flotation froth is of significant importance because it ultimately determines overall flotation performance. Froth recovery, the fraction of valuable minerals coming into the froth phase which survive and report to the concentrate, has been widely used to evaluate the efficiency of transporting the valuable minerals from the pulp-froth interface to the concentrate launder.Froth recovery is related to the time that particles spend in the froth and the rate at which bubbles burst.It is believed that froth rheology has an impact on froth recovery in flotation. A more viscous froth should resist motion towards the lip, rising vertically before overflowing into the cell launder, resulting in significantly higher froth residence times and increased probability of froth drop back as well as froth collapse. Very little work has been done to study the rheology of a highly mineralised flotation froth and how it impacts on froth recovery. Therefore, this project aims to gain an insight into the correlations between froth properties, froth rheology and flotation performance.To achieve this goal, a novel method to measure froth rheology properly was developed in this project. The method involves the use of a rotating vane surrounded by a tube. The tube is required to minimise the adverse effects of the horizontal flow on the measurement.Equations have been provided to convert the vane rotational speed and measured torque to shear rate and shear stress, depending on whether the froth within the tube is fully or partially sheared.In order to investigate the correlation between froth rheology and froth properties, flotation tests were performed in a 20 L continuous flotation cell using a synthetic ore which was a mixture of chalcopyrite and silica. The flotation tests, conducted under different flotation conditions (i.e. air rate, froth depth, impeller speed, feed grade and feed P80), resulted in significant changes in the froth properties and the viscosity of the froth. The froth was shown to be shear thinning with minor yield stress. It could be modelled using a power-law model with the consistency index of this function being able to be used to represent the degree of viscosity of the froth phase.The observed change in the froth viscosity was shown to be largely a function of the change in the bubble size and the percentage of the bubble surface covered by particles. Smaller bubbles and a greater coverage of particles on the bubble surface result in a greater resistance to froth motion. Thus changes in cell operation which reduce the froth bubble size (e.g. higher impeller speeds, higher frother dosage rates) will result in a more viscous froth. Higher feed grades and a smaller particle size which result in a greater proportion of bubble surface coverage will also result in higher froth viscosities.A model was proposed which relates the apparent viscosity of the froth to the shear rate, the froth bubble size, the gas volume fraction in the froth, the percentage of the bubble surface covered by particles and a fittabl...

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Rheological behavior of oil-based drilling foams

Cited by 19 publications

References 26 publications

The Effect of Salt on Stability of Aqueous Foams

The Effect of Salt on Stability of Aqueous Foams

Dynamic Features of Nonaqueous Foam in Fracture Systems

An investigation of flotation froth rheology

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