A Study on the Matching Relationship of Polymer Molecular Weight and Reservoir Permeability in ASP Flooding for Duanxi Reservoirs in Daqing Oil Field

• Published in: Energies (Basel) Vol. 10; no. 7; p. 951
• Main Authors: Huang, Bin, Zhang, Wei, Xu, Rui, Shi, Zhenzhong, Fu, Cheng, Wang, Ying, Song, Kaoping
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.07.2017
• Subjects: ASP flooding; Cyclotrons; Enhanced oil recovery; Experiments; Flooding; Fluids; Gasoline; matching relationship; Membrane permeability; Mercury; Micelles; Molecular weight; morphology of molecular aggregation; Oil and gas fields; Oil fields; Optimization; Permeability; Petroleum engineering; polymer molecular weight; Polymers; Pore size; Porosity; reservoir permeability; Reservoirs; Salinity; Surfactants; Van der Waals forces; Viscosity; Beijing China; China
• ISSN: 1996-1073; 1996-1073
• DOI: 10.3390/en10070951

[...]if the molecular weight is too high it may block the oil-producing layer [7]. [...]before conducting ASP technology in the field it is a vital task to study the relationship between the molecular weight and the polymer concentration and the permeability of reservoir [8]. The measurement is complicated and the core after mercury injection cannot be reused. [...]the scope of application is limited [15]. rh of synthetic core is usually calculated by Kozeny Carmen formula [16]: rh=[Kw (1−φ)2cφ]0.5 where, rh is the radius of pore throat, μm; c is Kozeny constant, c = 0.2; φ is the porosity of the pore, %; Kw is the water permeability, 10−3 μm2. According to the above analysis, we assume the relationship between the molecular cyclotron radiuses and the radius of the pore throat can be used to represent the relationship between the polymer molecular weight and the core permeability. The Van der Waals forces between the surfactant molecules, the micelles formed after aggregation, and the polymer molecules tend to overcome the electrostatic repulsion. [...]the effect of Van der Waals forces on the electrical double layer in the polymer molecules is adsorption.