<?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>S0012-73532022000500043</article-id>
<article-id pub-id-type="doi">10.15446/dyna.v89n224.104396</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[Experimental evaluation of sandstone stimulation fluids for acid sludge prevention during oil well matrix stimulation jobs]]></article-title>
<article-title xml:lang="es"><![CDATA[Evaluación experimental de fluidos para estimulación en areniscas con el fin de prevenir la formación de sludge durante trabajos de estimulación matricial en pozos de petróleo]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Romero-Vera]]></surname>
<given-names><![CDATA[Tatiana Alexandra]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Sepúlveda-Yepes]]></surname>
<given-names><![CDATA[Edwin Alonso]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Nacional de Colombia Facultad de Minas ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2022</year>
</pub-date>
<volume>89</volume>
<numero>224</numero>
<fpage>43</fpage>
<lpage>49</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0012-73532022000500043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0012-73532022000500043&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0012-73532022000500043&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Acid induced sludge can compromise matrix stimulation jobs performance in oil well interventions, it is associated to multiple sources including combinations of iron dissolved components, acid type and strength, certain crude oils and different type of additives such us surfactants, acid corrosion inhibitors, etc. Along with it generally comes changes in reservoir rock wettability and poor emulsion break which ends in emulsion blockage and that seriously compromises reservoir fluids recovery. The purpose of this study is the implementation of compatibility tests in different acid &amp; crude oil proportions to find the appropriate additives and its concentrations to control acid induced sludge, shorten emulsion breaking times and avoid wettability changes. Two stimulation fluids at different acid strengths were successfully adjusted to prevent sludging tendencies finding ferric iron inhibitors, anti-sludge agents, mutual solvents, and surfactants as critical materials to prevent and control sludge formation prior to job executions.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El sludge inducido por tratamientos ácidos puede comprometer el resultado de una intervención a pozo con estimulación matricial, este se asocia a componentes férricos, tipo de ácido y crudo, así como a una amplia variedad de aditivos incluyendo surfactantes, inhibidores de corrosión, etc. Junto con la formación de sludge se producen cambios en la humectabilidad de la roca y en el rompimiento de emulsiones lo cual puede comprometer la recuperación de fluidos. El propósito de este estudio es implementar pruebas de compatibilidad en diferentes proporciones ácido - crudo para encontrar los aditivos en la concentración adecuada para controlar formación de sludge inducido por ácido, reducir tiempos de rompimiento de emulsión y evitar cambios de humectabilidad. Dos fluidos de estimulación a diferentes concentraciones de ácido se ajustaron exitosamente para prevenir esta tendencia, encontrando inhibidores de hierro, agentes anti-sludge, solvente mutual y surfactantes como materiales críticos para prevenir y controlar la formación de sludge.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[stimulation fluids]]></kwd>
<kwd lng="en"><![CDATA[sludge prevention]]></kwd>
<kwd lng="en"><![CDATA[matrix stimulation]]></kwd>
<kwd lng="en"><![CDATA[well intervention]]></kwd>
<kwd lng="en"><![CDATA[acidizing jobs: mutual solvents]]></kwd>
<kwd lng="en"><![CDATA[iron control]]></kwd>
<kwd lng="es"><![CDATA[fluidos de estimulación]]></kwd>
<kwd lng="es"><![CDATA[prevención de sludge, estimulación matricial, acidificación]]></kwd>
<kwd lng="es"><![CDATA[solventes mutuales]]></kwd>
<kwd lng="es"><![CDATA[control de hierro]]></kwd>
</kwd-group>
</article-meta>
</front><back>
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