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- W2046757219 abstract "Abstract Xanthan biopolymer has been shown to have effective mobility control properties in highly saline environments and to resist shear degradation. The use of this material in low permeability formations has been limited because of injectivity problems arising from the presence of cellular debris. This paper presents the laboratory evaluation and field paper presents the laboratory evaluation and field testing of an enzymatic clarification process, and subsequent polymer injection in a low permeability carbonate reservoir. The studies show that increased solution viscosity and improved filterability can be achieved by prehydrating the polymer in fresh water, that the enzyme treatment can be effectively performed under field conditions, and that the process can lead to adequate polymer injectivity in a low permeability reservoir when good water quality and effective quality control procedures are maintained. Introduction Properties of certain water soluble polymers, such as polyacrylamides and the biopolymer xanthan gum, make them candidates for use in improving mobility of drive fluids in water flood and micellar flood processes. Biopolymers have the advantageous properties of resistance to degradation by shear, properties of resistance to degradation by shear, viscosity relatively insensitive to temperature and to water salinity, and low adsorption. Along with these desirable qualities, biopolymers have a potential injectivity problem when injected into potential injectivity problem when injected into low permeability reservoirs. The injectivity impairment of a biopolymer solution results from minute aggregates of incompletely dissolved polymer, inherent bacterial cellular debris, and residual proteinaceous material arising from the fermentation process. Microscopic examination of the bacterial cells indicate their dimensions to be 0.3 to 0.5 microns in diameter by 0.7 to 2.0 microns in length. Proposed methods to remove this undesirable material have included cartridge and diatomaceous earth filtration, clay flocculation, and chemical and enzymatic clarification. A field-scale treatment for removal of particulate matter from biopolymer is presented. The pilot was conducted in the San Andres Dolomite formation of West Texas. Reservoir parameters and water composition are presented in Table 1. This paper describes laboratory development, field testing and subsequent pilot injection of an enzyme treated xanthan biopolymer into this low permeability formation. LABORATORY TESTING Laboratory testing involved investigation of various aspects of biopolymer application in the pilot project and optimization of the enzyme pilot project and optimization of the enzyme clarification process for field use. Viscous biopolymer solutions require three stages of mixing: initial wetting, dissolution, and hydration which is accomplished by the application of high shear. Accepted practice involves mixing of a 0.6 to 1.0% (by weight) concentrated polymer solution (prehydration), and subsequently diluting this solution to the desired concentration. In this sequence, all mixing is in injection water. For a saline environment, maximum viscosity for a given polymer concentration is obtained when fresh water is utilized in the prehydration step. The benefit of this precedure is seen in the data presented in Table II for a 1000 g/m3 (ppm) solution presented in Table II for a 1000 g/m3 (ppm) solution of biopolymer in a brine of 80,000 g/m (ppm) total dissolved solids. The final salinity of the solution obtained by prehydrating in fresh water is equal to the salinity of the solution hydrated in 90% brine/ 10% fresh water, but the solution prehydrated in fresh water achieved twice the viscosity of the solution prepared by the accepted method. An additional benefit of prehydration in fresh water is the more complete hydration of the polymer molecules as reflected in the more favorable filtration response presented in Figure 1. presented in Figure 1.At the time of this project, the enzyme clarification of biopolymer solutions was a recent development." @default.
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- W2046757219 date "1980-04-20" @default.
- W2046757219 modified "2023-09-25" @default.
- W2046757219 title "Biopolymer Injection Into A Low Permeability Reservoir" @default.
- W2046757219 doi "https://doi.org/10.2118/8836-ms" @default.
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