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https://hdl.handle.net/2440/48938
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Type: | Journal article |
Title: | Formation-damage evaluation from nonlinear skin growth during coreflooding |
Author: | Bedrikovetski, P. Vaz, A. Furtado, C. de Souza, A. |
Citation: | SPE Reservoir Evaluation and Engineering, 2011; 14(2):193-203 |
Publisher: | Soc Petroleum Eng |
Issue Date: | 2011 |
ISSN: | 1094-6470 1930-0212 |
Statement of Responsibility: | P. Bedrikovetsky, A. S. L. Vaz Jr., C. Furtado and A. L. S. de Souza |
Abstract: | Injectivity decline of oilfield injection wells is a widespread phenomenon during seawater/produced-water injection. The decline may result in significant cost increase of the waterflooding project. Reliable modeling-based prediction of injectivity-index decrease is important for waterflood design as well as for the planning of preventive injected-water treatment. One of the reasons for well injectivity decline is permeability decrease caused by rock plugging by solid/liquid particles suspended in the injected water. The mathematical model for deep-bed filtration contains two empirical functions: the filtration coefficient and the formation-damage coefficient. These empirical coefficients must be determined from laboratory coreflood tests by forcing water with particles to flow through the core samples. A routine laboratory method determines the filtration coefficient from expensive and difficult particle-concentration measurements at the core effluent; then, the formation-damage coefficient is determined from inexpensive and simple pressure-drop measurements. An alternative three-point-pressure method uses pressure data at an intermediate point of the core, supplementing pressure measurements at the core inlet and outlet. The method provides unique and stable values for constant-filtration and formation-damage coefficients. In the current work, we consider a more complex case in which both coefficients are linear functions of retained-particle concentration. In this case, the model is fully determined by four constants. The three-point-pressure method furnishes unique values for the four model parameters. A new semianalytical model for axisymmetric suspension filtration was developed to predict well-injectivity decline from the linear coreflood data with pressure measurements in three core points. |
Rights: | © 2011. Society of Petroleum Engineers |
DOI: | 10.2118/112509-PA |
Published version: | http://dx.doi.org/10.2118/112509-pa |
Appears in Collections: | Aurora harvest 6 Australian School of Petroleum publications |
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