Mobility control

J. R. DiAndreth and M. E. Paulaitis in D. H. Smith, ed., Sufactant-Based Mobility Control Progress in Miscible-FloodEnhanced OilRecovery, American Chemical Society, Washington, D.C., 1988. [Pg.155]

Surfactants for Mobility Control. Water, which can have a mobihty up to 10 times that of oil, has been used to decrease the mobihty of gases and supercritical CO2 (mobihty on the order of 50 times that of oil) used in miscible flooding. Gas oil mobihty ratios, Af, can be calculated by the following (22) ... [Pg.193]

Improving Mobility Control and Hardness Tolerance of AOS Formulations... [Pg.427]

Polymers can be used for mobility control. The interaction between polymers and surfactants is shown to be affected by pH, ionic strength, crude oil type, and the properties of the polymers and surfactants [642]. [Pg.198]

Water-in-oil macroemulsions have been proposed as a method for producing viscous drive fluids that can maintain effective mobility control while displacing moderately viscous oils. For example, the use of water-in-oil and oil-in-water macroemulsions have been evaluated as drive fluids to improve oil recovery of viscous oils. Such emulsions have been created by addition of sodium hydroxide to acidic crude oils from Canada and Venezuela. In this study, the emulsions were stabilized by soap films created by saponification of acidic hydrocarbon components in the crude oil by sodium hydroxide. These soap films reduced the oil/water interfacial tension, acting as surfactants to stabilize the water-in-oil emulsion. It is well known, therefore, that the stability of such emulsions substantially depends on the use of sodium hydroxide (i.e., caustic) for producing a soap film to reduce the oil/water interfacial tension. [Pg.202]

The low-tension polymer flood technique consists of combining low levels of polymer-compatible surfactants and a polymer with a waterflood. This affects mobility control and reduces front-end and total costs. [929]. [Pg.205]

Pseudozan is an exopolysacchaiide produced by a Pseudomonas species. It has high viscosities at low concentrations in formation brines, forms stable solutions over a wide pH range, and is relatively stable at temperatures up to 65° C. The polymer is not shear degradable and has pseudoplastic behavior. The polymer has been proposed for enhanced oil-recovery processes for mobility control [1075]. [Pg.206]

Xanthan exhibits an interaction with anionic surfactants (petroleum sulfate), which is a beneficial synergistic effect for mobility control in chemical-enhanced oil-recovery processes [1115]. [Pg.206]

Coinjection of a low-concentration surfactant and a biopolymer, followed by a polymer buffer for mobility control, leads to reduced chemical consumption and high oil recovery. There may be synergistic effects between the surfactant and the polymer in a dynamic flood situation. The chromatographic separation of surfactant and polymer is important to obtain good oil recovery and low surfactant retention [1721],... [Pg.207]

S. Ameri, K. Aminian, J. A. Wasson, and D. L. Durham. Improved CO2 enhanced oil recovery—mobility control by in-situ chemical precipitation Final report. US DOE Rep DOE/MC/22044-15, West Virginia Univ, June 1991. [Pg.349]

J. K. Borchardt and A. R. Strycker. Olefin sulfonates for high temperature steam mobility control Structure-property correlations. [Pg.360]

C. L. McCormick and R. D. Hester. Polymers for mobility control in enhanced oil recovery final report. US DOE Fossil Energy Rep DOE/BC/10844-20, Southern Mississippi Univ, 1990. [Pg.429]

T. Zhu, A. Strycker, C. J. Raible, and K. Vineyard. Foams for mobility control and improved sweep efficiency in gas flooding. In Proceedings Volume, volume 2, pages 277-286.11th SPE/DOE Impr Oil Recovery Symp (Tulsa, OK, 4/19-4/22), 1998. [Pg.480]

Recent research and field tests have focused on the use of relatively low concentrations or volumes of chemicals as additives to other oil recovery processes. Of particular interest is the use of surfactants as CO (184) and steam mobility control agents (foam). Also combinations of older EOR processes such as surfactant enhanced alkaline flooding and alkaline-surfactant-polymer flooding have been the subjects of recent interest. Older technologies polymer flooding (185,186) and micellar flooding (187-189) have been the subject of recent reviews. In 1988 84 commercial products polymers, surfactants, and other additives, were listed as being marketed by 19 companies for various enhanced oil recovery applications (190). [Pg.29]

The first mobility control agents were partially hydrolyzed polyacrylamides having molecular weights of 1-5x10 (254-259) and... [Pg.34]

The reason for wide-spread interest in the use of surfactants as gas mobility control agents (369) is their effectiveness at concentrations of 0.1%wt (377) or less (364). This low chemical requirement can significantly improve process economics. [Pg.39]

In addition to the mobility control characteristics of the surfactants, critical issues in gas mobility control processes are surfactant salinity tolerance, hydrolytic stability under reservoir conditions, and surfactant propagation. Lignosulfonate has been reported to increase foam stability and function as a sacrificial adsorption agent (392). The addition of sodium carbonate or sodium bicarbonate to the surfactant solution reduces surfactant adsorption by increasing the aqueous phase pH (393). [Pg.39]

Surfactants have been used as steam mobility control agents in both laboratory and field tests to prevent this gravity override thereby increasing volumetric sweep efficiency. Surfactants that have been... [Pg.39]

Intermixing of the polymer mobility control fluid with the surfactant slug can result in surfactant - polymer interactions which have a significant effect on oil recovery (476). Of course, oil - surfactant interactions have a major effect on interfacial behavior and oil displacement efficiency. The effect of petroleum composition on oil solubilization by surfactants has been the subject of extensive study (477). [Pg.43]

Smith, D.H. Surfactant-Based Mobility Control - Progress in... [Pg.50]

Ryles, R.G. "Elevated Temperature Testing of Mobility Control Reagents", SPE paper 12008, 1983 SPE Annual Technical Conference and Exhibition, San Francisco, CA, October 5-8. [Pg.94]

Complex Copolymers for Mobility Control, Water Purification, and Surface Activity... [Pg.174]

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