Abstract The transport and reaction of fluids in porous media results unique pore growth channel evolution as the are dissolved. This often leads to formation highly conductive flow channels, commonly referred wormholes. objective this work is predict influence on structure wormhole channels. An experimental theoretical investigation a variety fluid systems, including strong acids, weak chelating agents, provides wide range conditions for studying formation. A generalized description...

Abstract A theoretical and experimental study on the dissolution of porous media by flowing acid has been carried out. Dissolution results in an evolution pore geometry formation random flow channels. The goal is to predict range conditions under which channels will form, effects various parameters structure their rate propagation through media. network model used describe behavior stochastic, rootlike that form during carbonate rock other systems. as a result attack are characterized...

Abstract A fundamental study of the deposition and aging a thin incipient wax‐oil gel that is formed during flow waxy oils in cooled pipes was performed. The solubility high molecular weight paraffins naphthenic, aromatic or paraffinic solvents very low decreases rapidly with decreasing temperature. This property leads to formation gels complex morphology deposit on cold walls subsea pipelines crudes. reduces pipe diameter capacity pipe. These contain large fraction oil trapped 3‐D network...

Abstract NOTE: The first page of text has been automatically extracted and included below in lieu an abstract Session 3613 Virtual Laboratory Accidents Designed to Increase Safety Awareness John T. Bell, H. Scott Fogler Department Chemical Engineering University Michigan, Ann Arbor, MI 48109-2136 Summary rules are often disregarded undergraduate laboratories, due either forgetfulness or complacency. People remember experiencing (ÊnearÊ) accidents much longer more vividly than written rules;...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStabilization of Asphaltenes in Aliphatic Solvents Using Alkylbenzene-Derived Amphiphiles. 1. Effect the Chemical Structure Amphiphiles on Asphaltene StabilizationChia-Lu Chang and H. Scott FoglerCite this: Langmuir 1994, 10, 6, 1749–1757Publication Date (Print):June 1, 1994Publication History Published online1 May 2002Published inissue 1 June 1994https://pubs.acs.org/doi/10.1021/la00018a022https://doi.org/10.1021/la00018a022research-articleACS...

Summary The effects of transport and reaction on the phenomenon worm-hole formation were investigated for a wide range fluid systems including strong acids, weak chelating agents. These are influenced by variety processes such as reactants to surface, reversible surface reactions, products away from surface. When these taken into account, common dependence dissolution Damköhler number is observed. There exists an optimum Damkohler at which minimum pore volumes required channel breakthrough....

Abstract Acidizing treatments are commonly used to remove near-wellbore damage and create artificial flow channels in carbonate formations. Matrix acidizing most useful when fracture is undesirable, such as a shale break or other natural boundary must be maintained prevent water gas production1 where ineffective, soft chalk formations.2 Unfortunately, matrix often require low injection rates fracturing the formation rock. These may also required heterogeneous formations with zones of...

Abstract Experimental and theoretical studies have been carried out to elucidate the mechanism of water sensitivity Berea sandstone quantify a number important parameters. Based on results novel experiments, physical model has developed. In this model, clay particles are released only when salt concentration falls below critical concentration. These colloidal remain dispersed in fresh with flowing fluid until they captured at local pore constriction, thereby decreasing permeability. A...

Abstract A network model has been developed to simulate the flow of emulsions and solid particles through porous media. Particle deposition due direct interception, as well pore plugging by straining are accounted for in model. The effects two important factors—the ratio particle size size, fluid velocity—on also investigated. strength lies its ability predict accurately effluent concentration profiles, permeability changes occurring during deep bed filtration, evolution filter coefficient...

High molecular weight paraffins are known to form gels of complex morphology at low temperatures due the solubility these compounds in aromatic or naphthene-base oil solvents. The characteristics strong functions shear and thermal histories samples. A model system wax was used understand gelation process mixtures. significant depression gel point a wax-oil sample observed by either decreasing cooling rate increasing steady stress. separates into two layers different characteristics, gel-like...

Abstract The presence of waxes in crude oil can lead to the formation wax deposits on walls cold subsea pipelines, which restricts flow and plugging pipelines. This problem has recently become more significant as production wells move further offshore causing be cooled below cloud point before reaching shore. Wax deposition was studied laboratory under conditions simulating a pipeline. is initiated by precipitation directly pipe wall network of' crystals (wax‐oil gel) with amounts trapped...

The phase stability of crude oil is dependent on a multitude factors, including temperature, pressure, and component fractions, especially long chain paraffin polar asphaltene fractions. Paraffins precipitate out the during pipeline transportation due to solubility limits, form paraffin−oil gel deposits pipe walls. presence asphaltenes in postulated affect formation these gels. To quantify this effect, controlled stress rheometer was used study gelation temperature yield model system. It...

The formation of silica particles by the ammonia-catalyzed hydrolysis tetraethyl orthosilicate (TEOS) in nonionic water-in-oil microemulsions was investigated as a function molecular structure surfactant, type oil, and concentrations surfactant water. Three types surfactants two oils, heptane cyclohexane, were used. Microemulsion solutions characterized using photon correlation spectroscopy, electrical conductivity measurement, titration phase separation points. TEOS size synthesized...

Abstract Wax deposition in subsea pipelines is a significant economic issue the petroleum industry. A mathematical model has been developed to predict increase both deposit thickness and wax fraction of using fundamental analysis heat mass transfer for laminar turbulent flow conditions. It was found that precipitation oil competing phenomenon with deposition. Two existing approaches consider either no (the independent model) or instantaneous solubility result an overprediction...

A technique has been developed to study the phenomenon of ultrasonic emulsification in which oil is dispersed as a fine suspension into water at 20 kHz. It was found that takes place two stages. In first stage, droplets order 70 μm are formed from instability interfacial waves. second stage these large successively broken small by cavitation until stable droplet size reached. this paper, criterion for waves linearized stability analysis planar oil-water interface exposed acoustic excitation....