{"id":22672,"date":"2017-08-14T12:09:06","date_gmt":"2017-08-14T18:09:06","guid":{"rendered":"https:\/\/www.boartlongyear.com\/?p=19285"},"modified":"2020-03-30T12:01:17","modified_gmt":"2020-03-30T18:01:17","slug":"how-to-drill-large-diameter-holes-through-lost-circulation-formations-in-a-single-pass","status":"publish","type":"post","link":"https:\/\/www.boartlongyear.com\/es\/insite\/how-to-drill-large-diameter-holes-through-lost-circulation-formations-in-a-single-pass\/","title":{"rendered":"C\u00f3mo perforar agujeros de gran di\u00e1metro a trav\u00e9s de formaciones de circulaci\u00f3n perdidas en una sola pasada"},"content":{"rendered":"
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Este art\u00edculo apareci\u00f3 originalmente en Coal International.<\/em><\/span><\/p>\n<\/div>

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DTFR: PERFORAR AGUJEROS DE GRAN DI\u00c1METRO<\/span><\/span><\/h1>
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La perforaci\u00f3n de circulaci\u00f3n inversa inundada de doble tubo (DTFR) est\u00e1 ganando un uso cada vez mayor en los mercados globales a medida que las empresas llegan a apreciar mejor los muchos beneficios que ofrece como alternativa a la perforaci\u00f3n rotatoria convencional.<\/p>\n<\/div>

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En cada mercado local, est\u00e1n viendo los resultados de todo lo que DTFR tiene para ofrecer, incluidos los pozos de mayor eficiencia, las muestras de alta calidad y la terminaci\u00f3n m\u00e1s r\u00e1pida del pozo. El DTFR, que esencialmente combina los m\u00e9todos convencionales y de circulaci\u00f3n inversa, se ha establecido firmemente en el mercado de los EE. UU. Durante m\u00e1s de 30 a\u00f1os de perforaci\u00f3n hasta profundidades de hasta 10,000 pies. \n<\/div>

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En Australia, donde Boart Longyear comenz\u00f3 a utilizar la t\u00e9cnica en 2012, ya existen cuatro plataformas que utilizan el m\u00e9todo, por lo general, lo que reduce el tiempo necesario para perforar un agujero de 150 metros de dos semanas a cinco d\u00edas. Se pueden anticipar resultados similares en Chile y \u00c1frica, donde el uso de la DTFR a\u00fan se encuentra en sus etapas iniciales.<\/p>\n

La DTFR tambi\u00e9n puede proteger \u00e1reas ambientalmente sensibles, as\u00ed como perforar agujeros de hasta 60 pulgadas de di\u00e1metro en una sola pasada. Una aplicaci\u00f3n reciente de un equipo de perforaci\u00f3n en el suroeste de Wyoming ofrece un buen ejemplo de ello en ambos frentes.<\/p>\n

Para crear un pozo de ventilaci\u00f3n para una mina subterr\u00e1nea de carb\u00f3n de pared larga, el equipo ten\u00eda poco m\u00e1s de cuatro semanas para guiar un trozo de 60 pulgadas hasta una profundidad de 550 pies a trav\u00e9s de una desafiante formaci\u00f3n geol\u00f3gica que inclu\u00eda dos acu\u00edferos. Aunque se vio obstaculizado por las demoras en el inicio del proyecto, el equipo lo hizo varios d\u00edas antes de la fecha l\u00edmite.<\/p>\n<\/div><\/div><\/div><\/div>\n\t\t\n\t\t\n\t<\/section>

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La t\u00e9cnica DTFR permiti\u00f3 que la inmensa broca penetrara en las zonas p\u00e9rdida de circulaci\u00f3n que imped\u00edan el uso de un equipo de perforaci\u00f3n m\u00e1s tradicional.<\/p>\n

La t\u00e9cnica bombea aire a trav\u00e9s del tubo exterior y fuerza el barro y los recortes hacia arriba a trav\u00e9s del tubo central, evitando que se obstruyan las formaciones rocosas porosas con estacas, un problema com\u00fan bajo la alta presi\u00f3n de la perforaci\u00f3n convencional.<\/p>\n<\/div><\/div>

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Una rotaci\u00f3n de cuadrillas de tres miembros trabaj\u00f3 durante todo el d\u00eda, utilizando un equipo de cabeza superior equipada con estabilizadores y broca maciza. Para minimizar el riesgo de colapsar la entrada de la mina, se perfor\u00f3 el pozo al costado del t\u00fanel y se instal\u00f3 y cement\u00f3 una carcasa de 54 pulgadas con un espesor de pared de 1\/2 pulgada. Luego, las cuadrillas de miner\u00eda subterr\u00e1nea excavaron y perforaron el concreto para abrir el pozo.<\/p>\n

Perforar un agujero de tan gran di\u00e1metro a trav\u00e9s de formaciones de p\u00e9rdida de circulaci\u00f3n en una sola pasada, y en menos de un mes y medio, simplemente no habr\u00eda sido posible usando otro m\u00e9todo, y pocas compa\u00f1\u00edas tienen los recursos, experiencia y pericia necesarios, y mucho menos un equipamiento de perforaci\u00f3n lo suficientemente grande.<\/p>\n<\/div>

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Aunque utilizado con mayor frecuencia para pozos de agua de gran di\u00e1metro, la t\u00e9cnica DTFR es igualmente adecuada para las aplicaciones de pozos geot\u00e9rmicos o de petr\u00f3leo & gas, as\u00ed como para los pozos de ventilaci\u00f3n como el de Wyoming. Tambi\u00e9n se est\u00e1 utilizando para perforar dos pozos de inyecci\u00f3n en el centro de Utah en el sitio de la primera instalaci\u00f3n de almacenamiento de l\u00edquidos de gas natural (LGN) de la caverna de sal subterr\u00e1nea en la regi\u00f3n de las Monta\u00f1as Rocosas. Otros usos incluyen pozos para pasta y pozos de servicio.<\/p>\n

Obviamente no todas las aplicaciones requieren la gran broca utilizada en la mina de carb\u00f3n de Wyoming. Existe m\u00e1s de una docena de tama\u00f1os de brocas desde 7-7 \/ 8 pulgadas en adelante, dependiendo de la necesidad.<\/p>\n

DTFR se puede usar tanto en formaciones no consolidadas como en formaciones rocosas duras. Si bien las herramientas espec\u00edficas dependen de la formaci\u00f3n y el tama\u00f1o del orificio que se necesita, siempre implica tuber\u00edas de doble tubo, escariadores de rodillos, estabilizadores y una broca con borde. Esta configuraci\u00f3n \u00fanica permite un orificio recto y un di\u00e1metro uniforme en una sola pasada.<\/p>\n<\/div><\/div><\/div><\/div>\n\t\t\n\t\t\n\t<\/section>

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Incluso con esta t\u00e9cnica de circulaci\u00f3n inversa inundada se necesita la perforaci\u00f3n convencional para iniciar el pozo. El pozo de la superficie generalmente va a una profundidad de 20 a 40 pies, donde la cubierta de la superficie est\u00e1 cementada.<\/p>\n

El pozo de perforaci\u00f3n tambi\u00e9n se perfora convencionalmente hasta que se alcanza la inmersi\u00f3n, generalmente a unos 100 pies por debajo del suelo.<\/p>\n<\/div>

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A partir de ah\u00ed, la t\u00e9cnica inversa inundada se hace cargo, lo que permite el ajuste del tubo interno, la presi\u00f3n del pozo inferior y la capacidad de perforar a trav\u00e9s de zonas de p\u00e9rdida de circulaci\u00f3n. Una ventaja clave es que se puede utilizar la misma plataforma y barras para ambos m\u00e9todos, con un simple cambio de mangueras y bombas, al igual que los compresores y el equipo de refuerzo.<\/p>\n

Adem\u00e1s, la perforaci\u00f3n DTFR nunca empuja directamente hacia abajo sobre la broca, pero siempre retiene el peso, lo que resulta en un efecto de p\u00e9ndulo. Esto minimiza la desviaci\u00f3n del pozo, lo que resulta en un agujero recto y disminuye el desgaste de la broca, aumentando as\u00ed la longevidad.<\/p>\n<\/div>

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El proceso de DTFR en s\u00ed es relativamente sencillo. Comienza con el uso de un fluido de perforaci\u00f3n limpio, de viscosidad m\u00e1s baja, a base de lodo, que es alimentado por gravedad por el pozo o anular externo.<\/p>\n

El barro recoge los recortes de la cara de la broca, se mezcla con el aire y fluye a la superficie a trav\u00e9s del tubo central de manera similar a una paja com\u00fan para beber. Esto da como resultado una menor presi\u00f3n en el pozo y la formaci\u00f3n que la perforaci\u00f3n convencional, que bombea fluido de mayor viscosidad por el tubo central y devuelve los materiales por el anillo.<\/p>\n

En la superficie, los esquejes y el barro pasan a trav\u00e9s del cicl\u00f3n en el tanque de lodo. Luego, una serie de pantallas vibratorias separa los recortes del barro y los conos de desarenado separan la arena del fluido de perforaci\u00f3n, que luego puede recircularse por el orificio.<\/p>\n

Debido a que la muestra sale por el tubo central en lugar de por el borde exterior donde podr\u00eda recoger contaminantes, el resultado son muestras de formaci\u00f3n no contaminadas en tiempo real que representan con precisi\u00f3n la formaci\u00f3n en la cara de la broca. Esto proporciona relaciones de profundidad exactas para un an\u00e1lisis de formaci\u00f3n confiable.<\/p>\n<\/div>

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"\u00a1Eureka!"<\/p>\n\n\t<\/blockquote>

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Nunca se sabe lo que puede encontrar usando la DTFR. Hace varios a\u00f1os, fui perforador en un equipo tra\u00eddo para perforar un agujero exploratorio de 31 pulgadas en una mina de oro de Nevada marcada con agujeros de exploraci\u00f3n y n\u00facleo. Pero debido al tama\u00f1o del agujero que perforamos y la calidad de las muestras que obtuvimos, el resultado fue un momento \"Eureka!\": Descubrimos una veta de oro que el cliente no sab\u00eda que exist\u00eda.<\/p>\n<\/div>

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Si bien el descubrimiento no desencaden\u00f3 nada parecido a la fiebre del oro de California de hace m\u00e1s de un siglo y medio, s\u00ed atrajo la atenci\u00f3n un equipo de ge\u00f3logos que repentinamente se vio aumentado en n\u00famero y ocupaci\u00f3n, y dio como resultado la re-perforaci\u00f3n de varias \u00e1reas previamente desatendidas.<\/p>\n

Por supuesto, no todas las empresas descubrir\u00e1n oro. Pero por una buena raz\u00f3n, cada vez m\u00e1s son m\u00e1s los que descubren la perforaci\u00f3n de circulaci\u00f3n inversa inundada de doble tubo y esperan su propio momento para decir \"Eureka\".<\/p>\n<\/div><\/div><\/div><\/div>\n\t\t\n\t\t\n\t<\/section>","protected":false},"excerpt":{"rendered":"","protected":false},"author":66,"featured_media":22678,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[139],"tags":[164,262],"class_list":["post-22672","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-non-mining","tag-dual-tube-flooded-reverse","tag-dtfr","insitetype-field-experts"],"acf":[],"yoast_head":"\nHow to Drill Large-Diameter Holes Through Lost Circulation 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