Enhancement of permeability estimation by high order polynomial regression for capillary pressure curve correlation with water saturation

Suggesting a cost-effective and straightforward approach is indispensable for obtaining permeability estimates in carbonate reservoirs utilizing available well logs. In this study, several procedures were conducted to reach an optimum approach, primarily by constructing a correlation between capillary pressure and water saturation using core data plotted and utilized a good polynomial regression to obtain a better relationship, which leads to calculating the permeability. The second step is to use different theoretical models which Tixier introduces, Timur, Coats, and Dumanior, which resulted not good matching with the permeability from core analysis and modified Brown and Husseini correlation which used and gave better matching than others correlations by comparing the results with the calculated permeability depending on core data. The proposed approach in this study based on modified Husseini equation using the well logs data by applying Statistical regression techniques within capillary pressure prediction to enhance reservoir characterization can potentially advantage reservoir simulation efforts. Obtained results of permeability prediction based on capillary pressure correlation was examined for a certain well and compared with the measured permeability value of cores. There was a good matching between the predicted and measured permeability

Enhancement of PEO Performance in Reducing Turbulent Flow Drag with the Addition of SDBS Anionic Surfactant

Polyethylene Oxide (PEO) is a non-ionic polymer which has been used widely as a drag reduction (DR) agent. Nevertheless, its ability to reduce drag in turbulent flow is yet limited. Thus, in this paper, a study to improve the ability of PEO to reduce drag in a turbulent flow through the addition of an anionic surfactant (Sodium dodecyl benzene sulfonate-SDBS) is presented. The various concentration range of PEO (10, 20, 40 and 60 ppm) and SDBS (100, 200, 400, and 500 ppm) was studied. The physical properties, viscosity, and electrical conductivity were measured to evaluate interaction in a complex solution. The electrical conductivity measurements confirmed that the interaction between the polymer-surfactant solutions takes place between the CAC-PSP points. The drag reduction measurements were done using a Rotating Disk Apparatus (RDA). The RDA results showed substantial findings when the anionic surfactant-polymer solution was compared to the pure polymer solution. The interaction between the polymer and the surfactant results in transforming the polymer from coil to straight-like body which enhanced the polymer drag reduction ability. The PEO-SDBS solution showed the highest DR of 50 %, at a mixture concentration of 60 ppm of PEO with 200 ppm of SDBS. Nonetheless, at higher concentrations, the DR value dropped due to the increase in the relative viscosity of the solution which enhanced the resistance to the flow

The Effect of HTAC Addition on the Efficiency of PEO in Turbulent Flow

Objectives: Polyethylene Oxide (PEO) is one of the most effective drag reduction additives. However, it limits and degrades under high share stress. The improvement of its Drag Reduction (DR) efficiency and degradation resistant with the addition of cationic surfactant was investigated. Methods/Statistical Analysis: PEO at concentrations of 10 and 20 ppm were mixed with a different concentration of Hexadecyltrimethylammonium Chloride (HTAC). Capillary viscometerand Rotating Disk Apparatus (RDA) were used to measure the viscosity and the %DR, respectively. Findings: The results showed an improvement in both the DR ability and degradation resistance when the complex polymer-surfactant was used, compared to the pure polymer. The maximum DR was recorded as 36% at 10ppm and 42% at 20ppm PEO and 125ppm HTAC. This improvement was due to the interaction between the micelles and the polymer. Application/Improvements: This improvement will promote the use of PEO/HTAC mixture in higher share stress flow application