{"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\/fr\/insite\/how-to-drill-large-diameter-holes-through-lost-circulation-formations-in-a-single-pass\/","title":{"rendered":"Comment percer des trous de grand diam\u00e8tre \u00e0 travers des formations de circulation perdues en un seul passage"},"content":{"rendered":"
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Cet article a paru \u00e0 l'origine dans Coal International.<\/em><\/span><\/p>\n<\/div>

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DTFR: PERCEZ DES TROUS DE GRAND DIAM\u00c8TRE<\/span><\/span><\/h1>
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Le forage \u00e0 double tube \u00e0 circulation invers\u00e9e noy\u00e9e (DTFR) est de plus en plus utilis\u00e9 sur les march\u00e9s mondiaux au fur et \u00e0 mesure que les entreprises comprennent de mieux en mieux les nombreux avantages qu\u2019elle offre comme une alternative au forage rotatif conventionnel.<\/p>\n<\/div>

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Sur chaque march\u00e9 local, ils voient les r\u00e9sultats de tout ce que DTFR a \u00e0 offrir, notamment des puits \u00e0 plus haute efficacit\u00e9, des \u00e9chantillons de haute qualit\u00e9 et une finition plus rapide des puits. DTFR, qui combine essentiellement les m\u00e9thodes conventionnelle et \u00e0 circulation inverse, s'est fermement \u00e9tabli sur le march\u00e9 am\u00e9ricain depuis plus de 30 ans de forage \u00e0 des profondeurs pouvant atteindre 10 000 pieds. \n<\/div>

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En Australie, o\u00f9 Boart Longyear a commenc\u00e9 \u00e0 utiliser cette technique en 2012, quatre plates-formes utilisant cette m\u00e9thode sont d\u00e9j\u00e0 en place, ce qui r\u00e9duit g\u00e9n\u00e9ralement le temps n\u00e9cessaire pour forer un trou de 150 m\u00e8tres de moins de deux semaines \u00e0 cinq jours. Des r\u00e9sultats similaires peuvent \u00eatre attendus au Chili et en Afrique, o\u00f9 l'utilisation de DTFR en est encore \u00e0 ses d\u00e9buts.<\/p>\n

DTFR peut \u00e9galement prot\u00e9ger des zones sensibles du point de vue de l'environnement ainsi que forer des trous atteignant 60 pouces de diam\u00e8tre en un seul passage. Une r\u00e9cente demande d'une \u00e9quipe de forage dans le sud-ouest du Wyoming offre un bon exemple sur les deux fronts.<\/p>\n

Afin de cr\u00e9er un puits de ventilation pour une mine de charbon souterraine souterraine, l'\u00e9quipe disposait d'un peu plus de quatre semaines pour guider un foret de 60 pouces jusqu'\u00e0 une profondeur de 550 pieds \u00e0 travers une formation g\u00e9ologique complexe comprenant deux aquif\u00e8res. Malgr\u00e9 les retards de d\u00e9marrage du projet, l\u2019\u00e9quipe s\u2019est acquitt\u00e9e de son retard plusieurs jours avant la date limite.<\/p>\n<\/div><\/div><\/div><\/div>\n\t\t\n\t\t\n\t<\/section>

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La technique DTFR a permis au tr\u00e9pan extraordinaire de p\u00e9n\u00e9trer dans les zones de circulation \u00e0 perte qui emp\u00eachaient l\u2019utilisation d\u2019un appareil de forage sur\u00e9lev\u00e9 plus traditionnel.<\/p>\n

La technique pompe l'air \u00e0 travers le tube ext\u00e9rieur et force la boue et les d\u00e9blais de forage \u00e0 travers le tube central, les emp\u00eachant de boucher les formations rocheuses poreuses avec des d\u00e9blais, un probl\u00e8me courant sous les pressions \u00e9lev\u00e9es des forages conventionnels.<\/p>\n<\/div><\/div>

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Les \u00e9quipes compos\u00e9es de trois membres en rotation ont travaill\u00e9 sans rel\u00e2che, en utilisant une plate-forme d\u2019entra\u00eenement sup\u00e9rieure \u00e9quip\u00e9e de stabilisateurs et d\u2019un foret massif. Afin de minimiser le risque d'effondrement de l'entr\u00e9e de la mine, le trou de forage a \u00e9t\u00e9 for\u00e9 sur le c\u00f4t\u00e9 du tunnel de la mine et un tubage de 54 pouces avec une \u00e9paisseur de paroi de 1\/2 pouce a \u00e9t\u00e9 install\u00e9 et ciment\u00e9 en place. Les \u00e9quipes de mines souterraines ont ensuite min\u00e9 et perc\u00e9 le b\u00e9ton pour ouvrir le puits.<\/p>\n

Percer un tel trou de diam\u00e8tre important \u00e0 travers des formations \u00e0 perte de circulation en un seul passage - et en moins d\u2019un mois et demi - n\u2019aurait tout simplement pas \u00e9t\u00e9 possible par une autre m\u00e9thode et peu d\u2019entreprises disposent des ressources, de l\u2019expertise et de l\u2019exp\u00e9rience n\u00e9cessaires. mentionner une table de forage assez grande.<\/p>\n<\/div>

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Le plus souvent utilis\u00e9 pour les puits d\u2019eau de grand diam\u00e8tre, le DTFR convient \u00e9galement aux applications p\u00e9troli\u00e8res et gazi\u00e8res pr\u00e9collectives et g\u00e9othermiques ainsi qu\u2019aux puits de ventilation comme celui du Wyoming. Il est \u00e9galement utilis\u00e9 pour le forage de deux puits d\u2019injection dans le centre de l\u2019Utah, sur le site de la premi\u00e8re installation de stockage souterraine de liquides de gaz naturel (NGL) dans la caverne de sel, dans la r\u00e9gion des Rocheuses. D'autres utilisations incluent les trous de p\u00e2te et les trous utilitaires.<\/p>\n

Bien entendu, toutes les applications ne n\u00e9cessitent pas le bit g\u00e9ant utilis\u00e9 dans la mine de charbon du Wyoming. Les bits sont disponibles dans plus d'une douzaine de tailles, allant de 7 \u00e0 7\/8 pouces, en fonction des besoins.<\/p>\n

DTFR peut \u00eatre utilis\u00e9 \u00e0 la fois dans les formations non consolid\u00e9es et les formations de roche dure. Un outillage sp\u00e9cifique d\u00e9pend de la formation et de la taille du trou n\u00e9cessaire, mais il n\u00e9cessite toujours un tuyau \u00e0 deux tubes, des al\u00e9soirs \u00e0 rouleaux, des stabilisateurs et un foret \u00e0 jupe. Cette configuration unique permet un trou rectiligne et un diam\u00e8tre constant en un seul passage.<\/p>\n<\/div><\/div><\/div><\/div>\n\t\t\n\t\t\n\t<\/section>

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M\u00eame en cas d'inversion inond\u00e9e, un forage conventionnel est n\u00e9cessaire pour d\u00e9marrer le forage. Le forage de surface a g\u00e9n\u00e9ralement une profondeur de 20 \u00e0 40 pieds, o\u00f9 le tubage de surface est ciment\u00e9 sur place.<\/p>\n

Le forage de compl\u00e9tion est \u00e9galement for\u00e9 de mani\u00e8re conventionnelle jusqu'\u00e0 la submersion, g\u00e9n\u00e9ralement \u00e0 environ 100 pieds sous le sol.<\/p>\n<\/div>

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\u00c0 partir de l\u00e0, la technique de l'inondation noy\u00e9e prend le relais, permettant l'ajustement de la chambre \u00e0 air, de la pression de forage la plus basse et de la possibilit\u00e9 de forer \u00e0 travers les zones de circulation \u00e0 perte. Un avantage cl\u00e9 est que le m\u00eame \u00e9quipement et les m\u00eames tiges peuvent \u00eatre utilis\u00e9s pour les deux m\u00e9thodes, la commutation impliquant simplement un changement de tuyaux et de pompes, ainsi que les compresseurs et le servomoteur.<\/p>\n

De plus, le forage DTFR ne pousse jamais directement sur le tr\u00e9pan mais maintient toujours le poids, ce qui entra\u00eene un effet de pendule. Cela minimise la d\u00e9viation du puits, r\u00e9sultant en un trou rectiligne et en r\u00e9duisant l'usure du tr\u00e9pan, augmentant ainsi la long\u00e9vit\u00e9.<\/p>\n<\/div>

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Le processus DTFR lui-m\u00eame est relativement simple. Cela commence par l'utilisation d'un fluide de forage propre, de faible viscosit\u00e9, \u00e0 base de boue, qui est achemin\u00e9 par gravit\u00e9 dans le trou de forage ext\u00e9rieur, ou anneau.<\/p>\n

La boue recueille les d\u00e9bris de la face du tr\u00e9pan, se m\u00e9lange \u00e0 l'air et s'\u00e9coule \u00e0 la surface \u00e0 travers le tube central, \u00e0 la mani\u00e8re d'une paille ordinaire. Cela entra\u00eene moins de pression sur le forage et sa formation que le forage conventionnel, qui pompe le fluide de viscosit\u00e9 sup\u00e9rieure dans le tube central et ram\u00e8ne les mat\u00e9riaux dans l'anneau.<\/p>\n

En surface, les d\u00e9blais et la boue passent \u00e0 travers le cyclone dans le bac \u00e0 boue. Une s\u00e9rie d'\u00e9crans vibrants s\u00e9pare ensuite les d\u00e9blais de la boue et les c\u00f4nes de d\u00e9sableur s\u00e9parent le sable du fluide de forage, qui peut ensuite \u00eatre recycl\u00e9 dans le trou.<\/p>\n

Parce que l'\u00e9chantillon monte dans le tuyau central plut\u00f4t que sur le bord ext\u00e9rieur o\u00f9 il pourrait ramasser des contaminants, il en r\u00e9sulte des \u00e9chantillons de formation non contamin\u00e9s en temps r\u00e9el qui repr\u00e9sentent avec pr\u00e9cision la formation \u00e0 la face du tr\u00e9pan. Ceci fournit des relations de profondeur exactes pour une analyse fiable de la formation.<\/p>\n<\/div>

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"Eur\u00eaka!"<\/p>\n\n\t<\/blockquote>

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Vous ne savez jamais ce que vous pourriez trouver avec DTFR. Il y a plusieurs ann\u00e9es, je faisais partie d'une \u00e9quipe amen\u00e9e \u00e0 forer un trou d'exploration de 31 pouces dans une mine d'or du Nevada parsem\u00e9e de trous d'exploration et de carottes. Mais \u00e0 cause de la taille du trou que nous avons perc\u00e9 et de la qualit\u00e9 des \u00e9chantillons que nous avons obtenus, le r\u00e9sultat obtenu \u00e9tait un instant \u00abEureka!\u00bb. Nous avons d\u00e9couvert une veine aurif\u00e8re que le client ignorait.<\/p>\n<\/div>

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Cette d\u00e9couverte n\u2019a pas d\u00e9clench\u00e9 la ru\u00e9e vers l\u2019or en Californie il ya plus d\u2019un si\u00e8cle et demi, mais elle a attir\u00e9 l\u2019attention d\u2019une \u00e9quipe de g\u00e9ologues soudainement attentive et \u00e9largie et a entra\u00een\u00e9 le re-forage de nombreuses zones jusque-l\u00e0 ignor\u00e9es.<\/p>\n

Bien s\u00fbr, toutes les soci\u00e9t\u00e9s ne d\u00e9couvriront pas d\u2019or. Mais pour cause, de plus en plus de personnes d\u00e9couvrent le forage \u00e0 double tube \u00e0 circulation invers\u00e9e et attendent leurs propres instants \u00abEureka!\u00bb.<\/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 Formations In a Single Pass 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