.... The effective diffusion coefficient of citric acid was found to be a function of the interplay between the calcium citrate precipitation and the presence of the counter calcium ions. At high initial acid concentration, (5, 7.5 wt the effects of calcium citrate precipitation and counter calcium ions were...

.... This is a pre print and subject to correction. Abstract This work concerns with simulation of permeability impairment as a result of asphaltene deposition at the field scale, which is a real situation of oil production from petroleum reservoirs. The involved processes are the initial precipitation of asphaltene from...

... and 3HCO . These ions in turn react with the minerals in place. Depending on the mineralogy of the formation, these reactions could induce precipitation of carbonate minerals such as Calcite, Dolomite and Siderite, which corresponds essentially to the conversion of CO2 into minerals. This paper discusses...

... Saskatchewan contain a large number of light oil resources, of which only approximately 10% is considered recoverable. Oil production is hindered by (a) permeability damage due to clay swelling and migration during water injection and (b) organic solid (asphaltenes/wax) precipitation due to pressure...

... precipitation production well injection asphaltene precipitation asphaltene inhibition heavy oil vapex experiment hydrate inhibition experiment oil production solubility fraction remediation of hydrates upstream oil & gas production chemistry 1 PAPER 2008-087 Role of Asphaltene...

... scale inhibition oilfield chemistry paraffin remediation flocculation precipitate upstream oil & gas production chemistry wax inhibition reservoir oil production interaction coefficient scale remediation asphaltene deposition remediation of hydrates bubble point pressure...

... cacl 2 surfactant solution ift nacl concentration waterflooding ift value mgcl 2 brine upstream oil & gas recovery value precipitation concentration salinity capillary number concentration range micromodel surfactant flooding experiment enhanced recovery ultimate recovery...

... Abstract When a hydrocarbon solvent is made in contact with a heavy oil under a sufficiently high reservoir pressure, asphaltene precipitation occurs so that the heavy oil is in-situ upgraded during a solvent-based heavy oil recovery process. Some physicochemical properties of this in-situ...

..., experience shows that compatibility tests do not reliably give an accurate indication of precipitation. Here, we show how to develop relevant correlations, which are useful for predicting precipitation of ions from such mixtures and then provide a practical example, which is for disposing different...

... upstream oil & gas initial pressure envirodrill reactor variation precipitation spike drillsol 1 PAPER 2005-047 Effect of Oxidation on Base Liquids of Oil and Synthetic-Based Drilling Fluids at High Pressures and High Temperatures K. SHAHBAZI, S.A. MEHTA, R.G. MOORE, M.G. URSENBACH University...

... Abstract Asphaltenes precipitation is one of the major operational problems affecting oil production in the Bangestan reservoir in south of Iranian fields. Precipitation of asphaltenes in reservoirs, wells and production facilities can have severe detrimental impact on the economics of oil...

... of asphaltene precipitation during solvent titration in heavy oil. At the second stage the Flory-Huggins (FH) model is modified by three adjustable parameters (a, b, c) to predict asphaltene precipitation more accurately. These parameters are defined based on molecular weight of asphaltene to molecular weight...

... of suspended solids, wax precipitation, scales, corrosions, as well as induced fractures can significantly influence the injectivity of an injector. Sand Production The sand production in producers has been studied extensively7-19 in the petroleum industry since the production of formation sand into a well...

... Introduction Some heavy oil and bitumen production processes involve the precipitation of asphaltenes upon the addition of a paraffinic diluent. For example, in a new oil sands process, a paraffin solvent is used to treat the froth generated in bitumen extraction. The recently proposed VAPEX...

... Abstract This paper describes the incorporation of asphaltene deposition and geochemistry in the simulation of CO 2 floods. The asphaltene deposition model includes reversible and irreversible asphaltene precipitation followed by surface deposition and pore-throat plugging. Simulation runs...

... of asphaltene deposition in the tubing. This paper will demonstrate the work process of the project, the results of the field trial of the asphaltene inhibitor before and after treatment, and lessons learned and recommendations. Background Asphaltene precipitation from petroleum reservoir fluids has proved...

...1PETROLEUM SOCIETY CANADIAN INSTITUTE OF MINING, METALLURGY & PETROLEUM PAPER 2002-006 Research of Experiment and Modelling on Wax Precipitation for Pubei Oilfield H. Mei, M. Zhang, M. Li, L. Sun, L. Sun, S. Li Southwest Petroleum Institute, China This paper is to be presented at the Petroleum...

...1PETROLEUM SOCIETY CANADIAN INSTITUTE OF MINING, METALLURGY & PETROLEUM PAPER 2002-015 PVT Investigation of Asphaltene Precipitation and Redissolution from Bitumens H. Alboudwarej, W.Y. Svrcek, H.W. Yarranton University of Calgary This paper is to be presented at the Petroleum Society s Canadian...

... water saturation increases as the pressure decreases. The values of water vaporisation ranged from 0.027 to 0.013 g H2O /min for 1000 psi and 1950 psi, respectively. Introduction Vaporisation of water due to gas production can result in precipitation of halite in reservoirs. Furthermore...

..., asphaltene precipitates, or wax. We will present experimental results showing the effects of application of ultrasound during precipitation and crystallization. Three systems were tested in this study; crystallization of salt from saturated aqueous solutions, re-dispersion of asphaltene in heptane, and pour...