{"id":1317,"date":"2020-05-11T10:00:00","date_gmt":"2020-05-11T13:00:00","guid":{"rendered":"http:\/\/oiltech.com.ar\/?p=1317"},"modified":"2021-02-13T09:29:02","modified_gmt":"2021-02-13T12:29:02","slug":"desafios-de-cementacion-de-pozos-hpht","status":"publish","type":"post","link":"https:\/\/oiltech.com.ar\/en\/desafios-de-cementacion-de-pozos-hpht\/","title":{"rendered":"DESAF\u00cdOS DE CEMENTACI\u00d3N DE POZOS HPHT"},"content":{"rendered":"<p>AUTOR:<strong> Ing. Andr\u00e9s Marcano <\/strong>&#8211; CEMENT SPECIALIST<\/p>\n\n\n\n<p><strong>\u00bfEn tu pa\u00eds existen yacimientos HPHT y la cementaci\u00f3n de revestidores en los mismos no ha sido exitosa en la primera operaci\u00f3n? Aqu\u00ed te damos unos tips para ayudarte en la b\u00fasqueda de soluciones a esa problem\u00e1tica.<\/strong><\/p>\n\n\n\n<p><strong>La cementaci\u00f3n de pozos de Alta Presi\u00f3n y Alta temperatura (HPHT) se refiere a aquellas operaciones en pozos que tienen presiones de yacimiento superiores a los 10000 psi y una temperatura de fondo de pozo por encima de 300\u02daF.<\/strong><\/p>\n\n\n\n<p>La cementaci\u00f3n de pozos en ambientes HPHT son un desaf\u00edo debido principalmente a las altas temperaturas de fondo que pudieran causar la deshidrataci\u00f3n del cemento dificultando la permanencia de este como un fluido dentro del pozo. Una adecuada formulaci\u00f3n de la lechada en los laboratorios es vital para el \u00e9xito de la operaci\u00f3n.<\/p>\n\n\n\n<p>&nbsp;<strong>Algunas diferencias entre una lechada HPHT y una lechada convencional son:<\/strong><\/p>\n\n\n\n<ul><li>La Lechada HPHT tiene un mayor requerimiento de agua (Ejemplo: Para una lechada HPHT de densidad \u03c1=20 lbs\/gal el requerimiento es de 7.11 gls\/saco, mientras que una lechada Convencional de \u03c1=15.6 lbs\/gal tiene un requerimiento de agua de 5.2 gls\/saco).<\/li><li>El rendimiento de la lechada HPHT es mayor que el rendimiento de la lechada Convencional. (Ejemplo: Para una Lechada HPHT de \u03c1= 20 lbs\/gal el rendimiento es 1.87 p3\/saco, mientras que una lechada convencional de \u03c1=15.6 lbs\/gal tiene un rendimiento de 1.18 p3\/saco).<\/li><li>La resistencia a la compresi\u00f3n a las24 hrs de una lechada HPHT es mayor que el de una lechada tipo Convencional. La resistencia a la compresi\u00f3n de una lechada HPHT de \u03c1= 20 lbs\/gal es aproximadamente 4800 psi, mientras que la lechada convencional de 15.6 lbs\/gal tiene una&nbsp; resistencia a la compresi\u00f3n de 3900 psi aproximadamente.<\/li><li>Las lechadas HPHT requieren aditivos de alta gravedad espec\u00edfica (Hematita) para alcanzar densidades de hasta 22 lbs\/gal, retardadores e intensificadores de temperatura especiales que son necesarios para dise\u00f1ar una lechada de largo tiempo de espesamiento.<\/li><\/ul>\n\n\n\n<p><strong>Para realizar una cementaci\u00f3n exitosa en pozos HPHT, se deben controlar par\u00e1metros tales como:<\/strong><\/p>\n\n\n\n<ul><li>La Reolog\u00eda y Velocidad de Bombeo para procurar un flujo del tipo Tap\u00f3n, generalmente en pozos HPHT la densidad equivalente de circulaci\u00f3n (ECD) est\u00e1 limitada por el estrecho margen entre la presi\u00f3n de fractura y la presi\u00f3n de poro.<\/li><li>La consistencia inicial del cemento en el Consist\u00f3metro HPHT se recomienda sea inferior a 30 Bc. como limite m\u00e1ximo de viscosidad, de ser mayor se debe repetir la prueba disminuyendo la concentraci\u00f3n del controlador de filtrado..<\/li><li>Agua libre 0, si el pozo es desviado ejecutar la prueba a 45 grados de inclinaci\u00f3n.<\/li><li>Sedimentaci\u00f3n est\u00e1tica, la cual debe estar en el orden de 0 a 0,5 lbs\/gal menor a la densidad te\u00f3rica.<\/li><li>P\u00e9rdida de fluido API &lt;50 ml \/ 30 min.<\/li><li>Compatibilidad de fluidos para reolog\u00eda y tiempo de espesamiento (UCA tambi\u00e9n en caso de OBM)<\/li><li>Resistencia del Gel Est\u00e1tico de la mezcla contaminada (Fluido-Espaciador, Espaciador\u2013Lechada), esto es importante para garantizar que el cemento contaminado sea de f\u00e1cil movilidad.<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-social-links aligncenter is-layout-flex wp-block-social-links-is-layout-flex\"><li class=\"wp-social-link wp-social-link-linkedin  wp-block-social-link\"><a 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s0.009-2.688,0.052-3.637c0.04-0.877,0.187-1.354,0.31-1.671c0.163-0.42,0.358-0.72,0.673-1.035 c0.315-0.315,0.615-0.51,1.035-0.673c0.317-0.123,0.794-0.27,1.671-0.31C9.312,4.631,9.597,4.622,12,4.622 M12,3 C9.556,3,9.249,3.01,8.289,3.054C7.331,3.098,6.677,3.25,6.105,3.472C5.513,3.702,5.011,4.01,4.511,4.511 c-0.5,0.5-0.808,1.002-1.038,1.594C3.25,6.677,3.098,7.331,3.054,8.289C3.01,9.249,3,9.556,3,12c0,2.444,0.01,2.751,0.054,3.711 c0.044,0.958,0.196,1.612,0.418,2.185c0.23,0.592,0.538,1.094,1.038,1.594c0.5,0.5,1.002,0.808,1.594,1.038 c0.572,0.222,1.227,0.375,2.185,0.418C9.249,20.99,9.556,21,12,21s2.751-0.01,3.711-0.054c0.958-0.044,1.612-0.196,2.185-0.418 c0.592-0.23,1.094-0.538,1.594-1.038c0.5-0.5,0.808-1.002,1.038-1.594c0.222-0.572,0.375-1.227,0.418-2.185 C20.99,14.751,21,14.444,21,12s-0.01-2.751-0.054-3.711c-0.044-0.958-0.196-1.612-0.418-2.185c-0.23-0.592-0.538-1.094-1.038-1.594 c-0.5-0.5-1.002-0.808-1.594-1.038c-0.572-0.222-1.227-0.375-2.185-0.418C14.751,3.01,14.444,3,12,3L12,3z M12,7.378 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screen-reader-text\">Facebook<\/span><\/a><\/li>\n\n\n\n<\/ul>\n\n\n\n<!--nextpage-->\n\n\n\n<p>By: <strong>Ing. Andr\u00e9s Marcano <\/strong>&#8211; CEMENT SPECIALIST<\/p>\n\n\n\n<p><strong>Do you have High Pressure\/High Temperature (HPHT) oil reservoir condition in your country and the cementing operations of casings is not been successful at the first jobs? Here are some tips to help you find solutions to that problem.<\/strong><\/p>\n\n\n\n<p><strong>HPHT Well Cementation (HPHT) refers to well operations which have reservoir pressures above 10,000 psi and a well bottom temperature above 300\u02daF.<\/strong><\/p>\n\n\n\n<p>Cementing wells in HPHT environment is a challenge mainly due to high formation temperatures that could cause cement dehydration by accelerating the cement slurry as a fluid condition into the well. The Proper slurry formulation in laboratory is vital to the success of the operation.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<\/p>\n\n\n\n<p><strong>Some differences between an HPHT slurry and a conventional are:<\/strong><\/p>\n\n\n\n<ul><li>HPHT slurry has a higher water requirement (Example: For an HPHT slurry of density 20 lbs\/gal the requirement is 7.11 gls\/sack, while a conventional slurry of 15.6 lbs\/gal has a water requirement of 5.2 gls\/sack).<\/li><li>&nbsp;HPHT slurry performance is higher than Conventional performance. (Example: For an HPHT slurry of 20 lbs\/gal the yield is 1.87 p3\/sack, while a conventional slurry of 15.6 lbs\/gal has a yield of 1.18 p3\/sack).<\/li><li>The 24 hours compression resistance of an HPHT slurry is higher than conventional-type slurry. The compression resistance of an HPHT slurry of 20 lbs\/gal is approximately 4800 psi, while conventional slurry of 15.6 lbs\/gal has a compression resistance of approximately 3900 psi.<\/li><li>HPHT slurry requires specific high gravity additives (Hematite) to achieve densities of up to 22 lbs\/gal, special retarders and temperature intensifiers that are necessary to design a slurry long thickening time.<\/li><\/ul>\n\n\n\n<p><strong>Field experience shows that for successful well cementing operation in HPHT parameters are:<\/strong><\/p>\n\n\n\n<ul><li>&nbsp;Rheology and Pumping Speed to ensure a flow of the Tap- type, usually in HPHT wells the equivalent circulation density (ECD) is narrow margin between fracture pressure and pore pressure.&nbsp;<\/li><li>The initial consistency of the cement in the HPHT Consistometer is recommended to be less than 30 Bc. as the maximum viscosity limit, if greater the test should be repeated by decreasing the concentration of the filter controller.<\/li><li>Free water 0, if the well is diverted run the test at 45 degrees incline.&nbsp;&nbsp;<\/li><li>Static sedimentation, which must be in the order 0 to 0.5 lbs\/gal less than the theoretical density.&nbsp;<\/li><li>Fluid loss API &lt;50 ml \/ 30 min.&nbsp;<\/li><li>Fluid compatibility for rheology and thickening time (UCA also in case of OBM) Static Gel Resistance of the contaminated mixture (Fluid-Spacer, Spacer\u2013Lechada), this is important to ensure that contaminated cement is easy to move.<\/li><\/ul>\n\n\n\n<ul class=\"wp-block-social-links aligncenter is-layout-flex wp-block-social-links-is-layout-flex\"><li class=\"wp-social-link wp-social-link-linkedin  wp-block-social-link\"><a href=\"https:\/\/www.linkedin.com\/company\/oiltech-ingenieria-y-proyectos\/\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path 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s0.484,1.08,1.08,1.08c0.596,0,1.08-0.484,1.08-1.08S17.401,6.116,16.804,6.116z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">Instagram<\/span><\/a><\/li>\n\n<li class=\"wp-social-link wp-social-link-facebook  wp-block-social-link\"><a href=\"https:\/\/www.facebook.com\/oiltechingenieria\/\" class=\"wp-block-social-link-anchor\"><svg width=\"24\" height=\"24\" viewbox=\"0 0 24 24\" version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" aria-hidden=\"true\" focusable=\"false\"><path d=\"M12 2C6.5 2 2 6.5 2 12c0 5 3.7 9.1 8.4 9.9v-7H7.9V12h2.5V9.8c0-2.5 1.5-3.9 3.8-3.9 1.1 0 2.2.2 2.2.2v2.5h-1.3c-1.2 0-1.6.8-1.6 1.6V12h2.8l-.4 2.9h-2.3v7C18.3 21.1 22 17 22 12c0-5.5-4.5-10-10-10z\"><\/path><\/svg><span class=\"wp-block-social-link-label screen-reader-text\">Facebook<\/span><\/a><\/li>\n\n\n\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>AUTOR: Ing. Andr\u00e9s Marcano &#8211; CEMENT SPECIALIST \u00bfEn tu pa\u00eds existen yacimientos HPHT y la cementaci\u00f3n de revestidores en los mismos no ha sido exitosa<\/p>","protected":false},"author":2,"featured_media":1309,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[56],"tags":[62,77,64,75,66,63],"_links":{"self":[{"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/posts\/1317"}],"collection":[{"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/comments?post=1317"}],"version-history":[{"count":3,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/posts\/1317\/revisions"}],"predecessor-version":[{"id":1374,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/posts\/1317\/revisions\/1374"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/media\/1309"}],"wp:attachment":[{"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/media?parent=1317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/categories?post=1317"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/oiltech.com.ar\/en\/wp-json\/wp\/v2\/tags?post=1317"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}