<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0012-7353</journal-id>
<journal-title><![CDATA[DYNA]]></journal-title>
<abbrev-journal-title><![CDATA[Dyna rev.fac.nac.minas]]></abbrev-journal-title>
<issn>0012-7353</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional de Colombia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0012-73532019000300066</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v86n210.74361</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Polymer adsorption isotherms with NaCl and CaCl 2 on kaolinite substrates]]></article-title>
<article-title xml:lang="es"><![CDATA[Isotermas de adsorción de polímeros con NaCl y CaCl 2 en sustratos de caolinita]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Martínez-Vertel]]></surname>
<given-names><![CDATA[Jaime José]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villaquirán-Vargas]]></surname>
<given-names><![CDATA[Ana Paula]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Villar-García]]></surname>
<given-names><![CDATA[Álvaro]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Moreno-Díaz]]></surname>
<given-names><![CDATA[Daniel Fernando]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez-Castelblanco]]></surname>
<given-names><![CDATA[Astrid Xiomara]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Industrial de Santander Grupo de Investigación en Recobro Mejorado ]]></institution>
<addr-line><![CDATA[Bucaramanga ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Ecopetrol S.A. - Instituto Colombiano del Petróleo ]]></institution>
<addr-line><![CDATA[Piedecuesta ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>07</month>
<year>2019</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>07</month>
<year>2019</year>
</pub-date>
<volume>86</volume>
<numero>210</numero>
<fpage>66</fpage>
<lpage>73</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532019000300066&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532019000300066&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532019000300066&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract During polymer injection in enhanced oil recovery processes, polymeric molecules are attached to the rock surface as a result of a series of interactions between both components, leading to concentration decrease on the injected batch. This phenomenon, known as adsorption [18], can be estimated by analytical models and depends on several factors like the type of rock, degree of hydrolysis and polymer concentration, reservoir temperature, salinity of formation water, among other aspects. This paper shows the results of 144 statics tests where salinity (NaCl and CaCl  2 ) and polymer concentration were taken as the parameters to be changed in order to determine which analytical model is the most accurate for the prediction of experimental results. The abnormal adsorption tendency with NaCl, indicates that the grater salinity value, the lesser adsorption value concentrations. This is mainly due to the response of the kaolinite substrate to flocculation.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen Durante la inyección de polímeros en procesos de recobro mejorado de petróleo, las moléculas poliméricas son atraídas a la superficie de la roca como resultado de una serie de interacciones entre ambos componentes, llevando finalmente a una disminución en la concentración del bache inyectado. Este fenómeno, conocido como adsorción [18], depende del tipo de roca, grado de hidrólisis y concentración del polímero, temperatura del yacimiento, salinidad del agua de formación, entre otros, y puede ser estimado a partir de modelos analíticos. Este trabajo muestra los resultados de 144 pruebas estáticas, en donde la salinidad (NaCl y CaCl  2 ) y la concentración de polímero se tomaron como parámetros a variar, con el fin de determinar cuál de los modelos analíticos es capaz de predecir en una forma más acertada los resultados experimentales. Finalmente se discute la tendencia anormal de la adsorción en presencia de NaCl, donde mayores valores de salinidad resultaron en menores valores de adsorción, como respuesta principalmente a la floculación de la caolinita.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[enhanced oil recovery]]></kwd>
<kwd lng="en"><![CDATA[polymer injection]]></kwd>
<kwd lng="en"><![CDATA[analytical models]]></kwd>
<kwd lng="en"><![CDATA[adsorption]]></kwd>
<kwd lng="en"><![CDATA[flocculation.]]></kwd>
<kwd lng="es"><![CDATA[recobro mejorado]]></kwd>
<kwd lng="es"><![CDATA[inyección de polímeros]]></kwd>
<kwd lng="es"><![CDATA[modelos analíticos]]></kwd>
<kwd lng="es"><![CDATA[adsorción]]></kwd>
<kwd lng="es"><![CDATA[floculación.]]></kwd>
</kwd-group>
</article-meta>
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