Identification of Mechanisms and Parameters of Formation Damage Associated with Chemical Flooding

Identification of Mechanisms and Parameters of Formation Damage Associated with Chemical Flooding Omar Patino; Omar Patino University of Oklahoma Search for other works by this author on: This Site Google Scholar Faruk Civan; Faruk Civan University of Oklahoma Search for other works by this author on: This Site Google Scholar Subhash N. Shah; Subhash N. Shah University of Oklahoma Search for other works by this author on: This Site Google Scholar David R. Zornes; David R. Zornes ConocoPhillips Search for other works by this author on: This Site Google Scholar Eugene A. Spinler Eugene A. Spinler ConocoPhillips Search for other works by this author on: This Site Google Scholar Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, February 2003. Paper Number: SPE-80271-MS https://doi.org/10.2118/80271-MS Published: February 05 2003 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Get Permissions Search Site Citation Patino, Omar, Civan, Faruk, Shah, Subhash N., Zornes, David R., and Eugene A. Spinler. "Identification of Mechanisms and Parameters of Formation Damage Associated with Chemical Flooding." Paper presented at the International Symposium on Oilfield Chemistry, Houston, Texas, February 2003. doi: https://doi.org/10.2118/80271-MS Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex Search Dropdown Menu nav search search input Search input auto suggest search filter All ContentAll ProceedingsSociety of Petroleum Engineers (SPE)SPE International Conference on Oilfield Chemistry Search Advanced Search AbstractThis paper presents a practical methodology and its verification for determination of the mechanisms and parameters of chemically induced formation damage. It is based on interpretation of laboratory core flood tests by diagnostic straight-line plotting schemes. Laboratory tests were conducted to measure the permeability impairment and effluent conditions as a function of time by flooding sandstone and limestone outcrop rock samples with various alkaline solutions (NaOH, KOH, NaSiO4) and alcohol (ethanol) as might be used for improved oil recovery. The single-phase permeability variation data were plotted according to prescribed diagnostic straight-line plotting schemes proposed by Wojtanowicz et al. and Civan. Plots that result in satisfactory straight-line trends reveal the predominate mechanisms of the formation damage. Further, the values of the parameters of the governing formation damage processes are determined from the intercept and slope of the straight-lines. Higher pH solutions were observed to have caused greater reductions in rock permeability. Civan's model better described the permeability variation due to scale dissolution and precipitation processes. The Wojtanowicz et al. model identified the formation damage mechanisms as pore surface deposition and sweeping. Different rock damage conditions were observed for the initial and the later test periods, indicating that more than one formation damage mechanism was involved. The analysis of the same experimental data reveals that a numerical model such as UTCHEM will require significantly more information to perform a similar analysis of the laboratory flood results. However, the diagnostic equations provide a practical and rapid means for the determination of the formation damage mechanisms.The methodology developed in this paper can be used for rapid detection and quantification of the formation damage mechanisms from core tests. The technique can be useful in the design of alkaline-surfactant-polymer (ASP) and/or micellar flooding chemical systems for field applications.IntroductionThe alkali technique is distinguished from all others by the fundamental basis that the chemicals promoting oil recovery are generated in situ1. High molecular naphtanic species in the oil react with alkali to produce salts, which must be surface active. However, it is not alkali per se that enhances oil recovery, but rather the hydrolyzed surfactant products.Mineral-alkali interactions have traditionally been of principal interest with respect to alkaline flooding operations, where considerable effort has been devoted to the analysis and prediction of alkali consumption throughout the flood. The objective is to maintain sufficient alkalinity in order to achieve the desired treatment efficiency.Strong Alkali (NaOH, KOH, NaSiO4) are very effective for mobilizing residual oil in laboratory core floods but implies also higher reactivity effects with reservoir rocks (clays, basically kaolinite), leading to chemical consumption and precipitation of aluminosilicates, and thus leading to a decrease in the value of permeability2.In this paper, first the methods for analysis of single-phase formation damage tests are presented. Second the previous published single-phase core flood tests are analyzed using these methods. Third various in-house experimental data for single- and two-phase experiments are generated and analyzed. A discussion of the results is also presented. Keywords: experimental data, deposition, turksoy 12, upstream oil & gas, mechanism, naoh, wojtanowicz, flow in porous media, bertaux, permeability Subjects: Reservoir Fluid Dynamics, Improved and Enhanced Recovery, Flow in porous media, Chemical flooding methods This content is only available via PDF. 2003. Society of Petroleum Engineers You can access this article if you purchase or spend a download.

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