<?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>0122-5383</journal-id>
<journal-title><![CDATA[CT&F - Ciencia, Tecnología y Futuro]]></journal-title>
<abbrev-journal-title><![CDATA[C.T.F Cienc. Tecnol. Futuro]]></abbrev-journal-title>
<issn>0122-5383</issn>
<publisher>
<publisher-name><![CDATA[Instituto Colombiano del Petróleo (ICP) - ECOPETROL S.A.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0122-53832021000200063</article-id>
<article-id pub-id-type="doi">10.29047/01225383.382</article-id>
<title-group>
<article-title xml:lang="en"><![CDATA[ANALYSIS OF GAS WELL CLASSIFICATIONS AND PRODUCTIVITY INFLUENCING FACTORS IN KELA-2 GAS FIELD]]></article-title>
<article-title xml:lang="es"><![CDATA[ANÁLISIS DE CLASIFICACIONES DE POZOS DE GAS Y FACTORES QUE INFLUYEN EN LA PRODUCTIVIDAD EN EL CAMPO DE GAS KELA-2]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhaolong]]></surname>
<given-names><![CDATA[LIU]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Yongzhong]]></surname>
<given-names><![CDATA[ZHANG]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hualin]]></surname>
<given-names><![CDATA[LIU]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zhikai]]></surname>
<given-names><![CDATA[LV]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Weigang]]></surname>
<given-names><![CDATA[HUANG]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,PetroChina Research Institute of Petroleum Exploration &amp; Development  ]]></institution>
<addr-line><![CDATA[Beijing ]]></addr-line>
<country>China</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>11</volume>
<numero>2</numero>
<fpage>63</fpage>
<lpage>70</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0122-53832021000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0122-53832021000200063&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0122-53832021000200063&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[ABSTRACT As one of the main gas fields in Chinese West-East Gas Transmission Project, cumulative gas production of Kela 2 Gas Field has been over 120 billion cubic meters since 2004. Each gas well has different gas production characteristics, water production, and pressure changes. Advanced water results in a serious non-homogeneous water invasion, and the actual gas production is much less than that in the development scheme. To further enhance the recovery of the Kela 2 Gas Field, productivity influencing factors of each gas pay interval are analyzed by using the production logging data based on geological characteristics. According to the change of the main gas pay and water production from production logging, gas wells are divided into four types, and three water invasion patterns in Kela 2 Gas Field. The causes of gas production changes and water production regime are analyzed for each type first, and then the main productivity influencing factors in gas wells are determined. The outcome shows that pressure drop, water breakthrough of gas pay layers, and different reservoir properties are the main productivity influencing factors. Through gas well classification of the Kela 2 Gas Field, the productivity influencing factors and productivity change regime are determined, which could provide grounds for further enhancing the recovery of the Kela 2 Gas Field.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[RESUMEN Como uno de los principales campos de gas del Proyecto de Transmisión de Gas Oeste-Este de China, la producción acumulada de gas del campo de gas Kela 2 ha superado los 120 mil millones de metros cúbicos desde 2004. Cada pozo de gas muestra diferentes características de producción en la producción de gas, producción de agua y cambio de presión. El avance del agua por adelantado da como resultado una grave invasión de agua no homogénea, y la producción real de gas es mucho menor que la del plan de desarrollo. Para mejorar aún más la recuperación del campo de gas Kela 2, los factores que influyen en la productividad de cada intervalo productivo de gas se analizan utilizando los datos de registro de producción basados en las características geológicas de desarrollo. De acuerdo con el cambio de la producción principal de gas y agua a partir del registro de producción, los pozos de gas se dividen en cuatro tipos y tres patrones de invasión de agua en el campo de gas Kela 2. Las causas del cambio en la producción de gas y la ley de producción de agua se analizan primero para cada tipo y luego se determinan los principales factores que influyen en la productividad de los pozos de gas. Los resultados indican que la caída de presión, la penetración de agua en la capa productiva de gas y las diferentes propiedades del yacimiento son los principales factores que influyen en la productividad. A través de la clasificación de pozos de gas del campo de gas Kela 2, se determinan los factores que influyen en la productividad y la ley de cambio de productividad, lo que podría proporcionar una base para mejorar aún más la recuperación del campo de gas Kela 2.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Kela-2 gas field]]></kwd>
<kwd lng="en"><![CDATA[Production logging]]></kwd>
<kwd lng="en"><![CDATA[Gas production profile]]></kwd>
<kwd lng="en"><![CDATA[Gas well classification]]></kwd>
<kwd lng="en"><![CDATA[Productivity influencing factors]]></kwd>
<kwd lng="en"><![CDATA[Water invasion pattern]]></kwd>
<kwd lng="es"><![CDATA[Campo de gas Kela-2]]></kwd>
<kwd lng="es"><![CDATA[Registro de producción]]></kwd>
<kwd lng="es"><![CDATA[Perfil de producción de gas]]></kwd>
<kwd lng="es"><![CDATA[Clasificación de pozos de gas]]></kwd>
<kwd lng="es"><![CDATA[Factores que influyen en la productividad]]></kwd>
<kwd lng="es"><![CDATA[Patrón de invasión de agua]]></kwd>
</kwd-group>
</article-meta>
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