{"id":6163,"date":"2026-09-05T03:50:20","date_gmt":"2026-09-05T03:50:20","guid":{"rendered":"https:\/\/www.pipetechservice.com\/?p=6163"},"modified":"2026-09-05T03:50:26","modified_gmt":"2026-09-05T03:50:26","slug":"what-is-the-typical-pullback-force-required-for-hdd","status":"publish","type":"post","link":"https:\/\/www.pipetechservice.com\/fr\/what-is-the-typical-pullback-force-required-for-hdd\/","title":{"rendered":"Quelle est la force de r\u00e9traction habituellement requise pour un disque dur ?"},"content":{"rendered":"<p><strong>R\u00e9ponse rapide<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Force de traction typique d'un HDD : environ 10 000 \u00e0 plus de 500 000 lb (4,5 \u00e0 plus de 227 t), la plupart des installations de pipelines de taille moyenne se situant entre 20 000 et 100 000 lb (9 \u00e0 45 t).<\/li>\n\n\n\n<li>Pour les tuyaux en PEHD, une r\u00e8gle empirique pratique consiste \u00e0 pr\u00e9voir une force de traction comprise entre environ 1 000 et 1 500 livres par pouce de diam\u00e8tre de tuyau.<\/li>\n\n\n\n<li>La norme ASTM F1962 (\u00e9dition en vigueur) constitue le r\u00e9f\u00e9rentiel reconnu pour le calcul de la force de traction lors du retrait d'un HDD ; elle prend en compte la somme des forces de frottement du tuyau, de tra\u00een\u00e9e du fluide, du cabestan et de tra\u00een\u00e9e d'entr\u00e9e-sortie, puis compare ce total \u00e0 la force de traction admissible du tuyau.<\/li>\n<\/ul>\n\n\n\n<p>La force de traction typique d\u2019un HDD varie d\u2019environ 10 000 lb (4,5 t) pour les petits forages de services publics \u00e0 plus de 500 000 lb (227 t) pour les travers\u00e9es de grand diam\u00e8tre et de longue distance, et la plupart des installations de pipelines de taille moyenne se situent entre 20 000 et 100 000 lb (9 \u00e0 45 t). Il s\u2019adresse aux ing\u00e9nieurs, entrepreneurs et propri\u00e9taires de pipelines qui pr\u00e9voient\u00a0<a href=\"https:\/\/www.pipetechservice.com\/fr\/pipeline-installation-services\/\" target=\"_blank\" rel=\"noreferrer noopener\">pose de canalisations sans tranch\u00e9e<\/a>.<\/p>\n\n\n\n<p>Dans ce guide :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Pourquoi la force de r\u00e9traction d\u00e9termine \u00e0 la fois le choix de la machine et celui des tuyaux.<\/li>\n\n\n\n<li>Valeurs de dimensionnement en fonction du diam\u00e8tre et du mat\u00e9riau des canalisations.<\/li>\n\n\n\n<li>Les quatre \u00e9l\u00e9ments qui sous-tendent toute estimation de la force de traction et la m\u00e9thode de calcul selon la norme ASTM F1962.<\/li>\n\n\n\n<li>Comment adapter la capacit\u00e9 de traction de votre installation de forage \u00e0 votre plan de forage, ainsi que les mesures \u00e0 prendre sur le terrain pour r\u00e9duire la charge.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-does-hdd-pullback-force-mean\">Que signifie \u00ab force de recul du disque dur \u00bb ?<\/h2>\n\n\n\n<p>Dans\u00a0<a href=\"https:\/\/www.pipetechservice.com\/fr\/horizontal-directional-drilling-services\/\" target=\"_blank\" rel=\"noreferrer noopener\">forage directionnel horizontal (HDD)<\/a>, la force de retrait est la charge de traction que l'installation de forage exerce sur le train de tiges lorsqu'elle ram\u00e8ne le tube de production \u00e0 travers le trou de forage al\u00e9s\u00e9. Il s'agit de la derni\u00e8re \u00e9tape du processus de forage horizontal dirig\u00e9 : une fois que le trou pilote a \u00e9t\u00e9 for\u00e9 et al\u00e9s\u00e9 au diam\u00e8tre requis, le train de tiges est fix\u00e9 derri\u00e8re l'al\u00e9soir \u00e0 l'aide d'un pivot et tir\u00e9 depuis la fosse de sortie jusqu'\u00e0 la plate-forme de forage, formant ainsi la canalisation install\u00e9e.<\/p>\n\n\n\n<p>La force de retrait est importante car c\u2019est la seule charge qui sollicite le tuyau lui-m\u00eame pendant l\u2019installation. L\u2019appareil de forage doit \u00eatre capable de la g\u00e9n\u00e9rer, et le tuyau doit pouvoir y r\u00e9sister sans subir de d\u00e9formation permanente. D'apr\u00e8s notre exp\u00e9rience sur le terrain, c'est lors de la phase de retrait que les projets de forage horizontal dirig\u00e9 (HDD) \u00e9chouent le plus souvent, soit parce que l'installation atteint ses limites de capacit\u00e9 vers la fin du retrait, soit parce que le tuyau est soumis \u00e0 une charge d\u00e9passant sa limite de traction et subit un \u00e9tirement, un flambage ou une ovalisation irr\u00e9versibles.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unit\u00e9s : la force de r\u00e9traction est mesur\u00e9e en livres (lb), en tonnes (t) ou en kilonewtons (kN) ; 1 t \u00e9quivaut \u00e0 environ 2 205 lb.<\/li>\n\n\n\n<li>Point de lecture : le foreur surveille cette valeur sur l'indicateur de charge de la plate-forme, et les ing\u00e9nieurs de projet ajoutent souvent un capteur de force au niveau du pivot afin d'obtenir une deuxi\u00e8me mesure ind\u00e9pendante.<\/li>\n\n\n\n<li>Moment de pic : la force augmente \u00e0 mesure que le tuyau s'enfonce dans le trou et atteint son maximum dans la derni\u00e8re partie de la traction, et non au d\u00e9but.<\/li>\n\n\n\n<li>R\u00e9f\u00e9rence de conception : pour les tuyaux en poly\u00e9thyl\u00e8ne, la norme ASTM F1962 (\u00e9dition en vigueur), qui constitue le guide de r\u00e9f\u00e9rence pour la pose de tuyaux en PE par forage horizontal \u00e0 grande profondeur (maxi-HDD), sert de r\u00e9f\u00e9rence pour l'estimation et la limitation de la force de retrait.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-typical-pullback-force-values-by-pipe-size\">Valeurs typiques de la force de r\u00e9traction en fonction du diam\u00e8tre du tuyau<\/h2>\n\n\n\n<p>Il n\u2019existe pas de valeur unique valable pour tous les forages, mais des fourchettes de r\u00e9f\u00e9rence sont bien \u00e9tablies. Pour les canalisations en PEHD dans un sol mod\u00e9r\u00e9ment compact, avec un fluide de forage correctement pr\u00e9par\u00e9, une r\u00e8gle empirique largement utilis\u00e9e dans la planification du forage horizontal dirig\u00e9 (HDD) est d\u2019environ 1 000 \u00e0 1 500 lb de force de traction par pouce de diam\u00e8tre de tuyau, pour des forages compris entre 1 000 et 2 500 pieds (300 \u00e0 800 m). Le tableau ci-dessous r\u00e9sume les fourchettes typiques de force de traction en forage horizontal dirig\u00e9 que nous utilisons pour la s\u00e9lection pr\u00e9liminaire des machines.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Diam\u00e8tre nominal du tuyau<\/th><th>Force de retrait typique d'un disque dur (HDPE, fourchette pr\u00e9visionnelle)<\/th><th>Cat\u00e9gorie de plate-forme type<\/th><\/tr><\/thead><tbody><tr><td>4 pouces (100 mm)<\/td><td>4 000 \u00e0 8 000 lb (2 \u00e0 4 t)<\/td><td>Mini<\/td><\/tr><tr><td>6 pouces (150 mm)<\/td><td>6 000 \u00e0 12 000 lb (3 \u00e0 5 t)<\/td><td>Mini<\/td><\/tr><tr><td>8 pouces (200 mm)<\/td><td>9 000 \u00e0 16 000 lb (4 \u00e0 7 t)<\/td><td>Mini<\/td><\/tr><tr><td>12 pouces (300 mm)<\/td><td>12 000 \u00e0 25 000 lb (5 \u00e0 11 t)<\/td><td>Midi<\/td><\/tr><tr><td>16 pouces (400 mm)<\/td><td>20 000 \u00e0 40 000 lb (9 \u00e0 18 t)<\/td><td>Midi<\/td><\/tr><tr><td>24 pouces (600 mm)<\/td><td>30 000 \u00e0 70 000 lb (14 \u00e0 32 t)<\/td><td>Du midi au maxi<\/td><\/tr><tr><td>36 pouces (900 mm)<\/td><td>50 000 \u00e0 110 000 lb (23 \u00e0 50 t)<\/td><td>Maxi<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Hypoth\u00e8ses de conception : sol de duret\u00e9 mod\u00e9r\u00e9e, fluide de forage adapt\u00e9 et longueurs de forage comprises entre environ 1 000 et 2 500 pieds (300 \u00e0 800 m). Les forages plus longs, plus durs ou plus courbes se situent \u00e0 la limite sup\u00e9rieure de chaque fourchette ou au-del\u00e0.<\/em><\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-256928d1 wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-by-pipe-size.jpg ,https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-by-pipe-size.jpg 780w, https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-by-pipe-size.jpg 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-by-pipe-size.jpg\" alt=\"Bar chart of typical HDD pullback force planning ranges for HDPE pipe from 4 to 36 inches in diameter\" class=\"uag-image-6165\" width=\"800\" height=\"600\" title=\"hdd-pullback-force-by-pipe-size\" role=\"img\" \/><\/figure><\/div>\n\n\n\n<p>Figure 1. Plages typiques de force de traction des tuyaux en PEHD (HDPE) en fonction du diam\u00e8tre nominal.<\/p>\n\n\n\n<p>Ces valeurs sont des estimations pr\u00e9visionnelles et ne constituent en aucun cas des garanties. La force de traction r\u00e9elle d\u00e9pend de la longueur du forage, du type de sol, des conditions de la boue de forage, de la courbure et du poids du tuyau. Ainsi, un tuyau de 12 pouces dans un forage sablonneux court peut n\u00e9cessiter une force de 10 000 lb, tandis que le m\u00eame tuyau dans un forage argileux long comportant des courbes serr\u00e9es peut n\u00e9cessiter une force de 35 000 lb. Les tuyaux en acier sont plus lourds et n\u00e9cessitent g\u00e9n\u00e9ralement un contr\u00f4le de la flottabilit\u00e9, ce qui augmente la force requise : pour les travers\u00e9es de cours d\u2019eau avec des tuyaux en acier de grand diam\u00e8tre (de 24 \u00e0 48 pouces), les forces de traction document\u00e9es dans les \u00e9tudes de cas publi\u00e9es sur le forage horizontal dirig\u00e9 (HDD) atteignent couramment 200 000 \u00e0 600 000 livres (de 90 \u00e0 270 t), et les plus grandes foreuses \u00ab maxi \u00bb ont une capacit\u00e9 nominale avoisinant les 1 300 000 lb (600 t) pr\u00e9cis\u00e9ment pour ce type de travaux.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-what-determines-pullback-force-the-four-components\">Qu'est-ce qui d\u00e9termine la force de r\u00e9traction ? Les quatre composantes<\/h2>\n\n\n\n<p>Chaque estimation de la force de traction en forage horizontal dirig\u00e9 (HDD) correspond \u00e0 la somme de quatre r\u00e9sistances qui s'exercent pendant le tirage du tuyau. La compr\u00e9hension de ces quatre composantes constitue le fondement du mod\u00e8le de conception ASTM F1962 utilis\u00e9 dans le forage horizontal dirig\u00e9 (HDD).<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Frottement du tuyau : r\u00e9sistance au glissement entre le tuyau et la paroi du trou de forage, \u00e9gale au poids effectif du tuyau dans la boue multipli\u00e9 par le coefficient de frottement (\u03bc). Les coefficients de frottement varient g\u00e9n\u00e9ralement entre 0,15 et 0,35 avec une boue de bonne qualit\u00e9 ; les trous secs ou effondr\u00e9s font grimper ce coefficient \u00e0 des valeurs bien plus \u00e9lev\u00e9es.<\/li>\n\n\n\n<li>Tra\u00een\u00e9e hydraulique : r\u00e9sistance rencontr\u00e9e par le fluide de forage lorsqu'il s'\u00e9coule le long de la surface du tube ; elle d\u00e9pend de la viscosit\u00e9 de la boue, de l'espace annulaire entre le tube et le trou de forage, ainsi que de la vitesse de traction.<\/li>\n\n\n\n<li>Effet de cabestan : dans les courbes du trac\u00e9 de forage, la tension augmente de mani\u00e8re exponentielle (voir l'\u00e9quation du cabestan dans la section \u00ab Calculs \u00bb ci-dessous). Quelques courbes l\u00e9g\u00e8res n'ont qu'un impact minime ; les courbes serr\u00e9es, en revanche, ont un impact consid\u00e9rable.<\/li>\n\n\n\n<li>R\u00e9sistance \u00e0 l'entr\u00e9e et \u00e0 la sortie : frottement du tuyau contre les supports \u00e0 rouleaux et contre le sol au niveau de la rampe d'entr\u00e9e avant qu'il ne p\u00e9n\u00e8tre dans le forage, ainsi que la pression du sol \u00e0 proximit\u00e9 des points d'entr\u00e9e et de sortie.<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Composant<\/th><th>Principaux facteurs<\/th><th>Part typique du total<\/th><th>Mesures sur le terrain permettant de le r\u00e9duire<\/th><\/tr><\/thead><tbody><tr><td>Frottement dans les tuyaux<\/td><td>Poids effectif du tuyau dans la boue, coefficient de frottement, longueur de contact<\/td><td>40 \u00e0 60 %<\/td><td>Coulis de lubrification conditionn\u00e9, surcoupe ad\u00e9quate, al\u00e9sage par \u00e9tapes<\/td><\/tr><tr><td>R\u00e9sistance hydraulique<\/td><td>Viscosit\u00e9 de la boue, espace annulaire, vitesse de remont\u00e9e<\/td><td>20 \u00e0 40 %<\/td><td>Maintenir la vitesse de traction entre 1 et 3 m\/min, veiller \u00e0 ce que l'espace annulaire reste d\u00e9gag\u00e9<\/td><\/tr><tr><td>Effet de cabestan<\/td><td>Angle de courbure et tension au niveau de chaque courbe<\/td><td>0 \u00e0 30 %, avec une forte augmentation dans les virages serr\u00e9s<\/td><td>G\u00e9om\u00e9trie de l'al\u00e9sage plus plate, absence de courbes prononc\u00e9es \u00e0 proximit\u00e9 du tuyau<\/td><\/tr><tr><td>R\u00e9sistance \u00e0 l'entr\u00e9e et \u00e0 la sortie<\/td><td>Support des rouleaux, angle de la rampe, sol au niveau des fosses<\/td><td>5 \u00e0 15 %<\/td><td>Supports \u00e0 rouleaux, rampe d'acc\u00e8s lubrifi\u00e9e, fosses propres<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><em>Les parts varient consid\u00e9rablement d'un projet \u00e0 l'autre et ne sont pas cumulables.<\/em><\/p>\n\n\n\n<div class=\"wp-block-uagb-image uagb-block-91e388bb wp-block-uagb-image--layout-default wp-block-uagb-image--effect-static wp-block-uagb-image--align-none\"><figure class=\"wp-block-uagb-image__figure\"><img loading=\"lazy\" decoding=\"async\" srcset=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-components.jpg ,https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-components.jpg 780w, https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-components.jpg 360w\" sizes=\"auto, (max-width: 480px) 150px\" src=\"https:\/\/www.pipetechservice.com\/wp-content\/uploads\/2026\/09\/hdd-pullback-force-components.jpg\" alt=\"Diagram showing the four HDD pullback force components: pipe friction in the borehole, drilling fluid drag, capstan effect at bends and entry-exit soil drag\" class=\"uag-image-6166\" width=\"800\" height=\"600\" title=\"hdd-pullback-force-components\" role=\"img\" \/><\/figure><\/div>\n\n\n\n<p>Figure 2. Les quatre composantes qui constituent la force de r\u00e9traction totale.<\/p>\n\n\n\n<p>Lors de notre surveillance du retrait sur un passage de conduite d'eau en PEHD de 600 mm (24 pouces), la force est pass\u00e9e d\u2019environ 12 t (26 500 lb) au moment o\u00f9 l\u2019extr\u00e9mit\u00e9 du tuyau est entr\u00e9e dans le trou \u00e0 34 t (75 000 lb) lors de l\u2019insertion du dernier tiers du train de tuyaux. Notre pic pr\u00e9vu \u00e9tait de 30 t ; la valeur mesur\u00e9e s\u2019est donc situ\u00e9e \u00e0 environ 13 % au-dessus de la pr\u00e9vision, ce qui reste dans la fourchette de 10 \u00e0 15 % que nous consid\u00e9rons comme normale pour un tirage en bon \u00e9tat. C\u2019est en comparant cette courbe aux valeurs pr\u00e9vues que l\u2019\u00e9quipe peut d\u00e9terminer si le forage se d\u00e9roule correctement ou si la boue pr\u00e9sente des d\u00e9faillances.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-calculate-pullback-force-the-astm-f1962-method\">Comment calculer la force de r\u00e9traction : la m\u00e9thode ASTM F1962<\/h2>\n\n\n\n<p>La m\u00e9thode reconnue pour calculer la force de traction lors du forage HDD est celle d\u00e9crite dans la norme ASTM F1962 (\u00e9dition actuelle), qui estime la force de traction totale pour les tuyaux en PE en additionnant les composantes de frottement, de tra\u00een\u00e9e du fluide, de cabestan et de charge du sol le long du trac\u00e9 de forage pr\u00e9vu. La plupart des calculateurs de force de traction pour forage horizontal dirig\u00e9 (HDD), qu'ils soient propri\u00e9taires ou en ligne, utilisent la m\u00eame logique de composants ; il s'agit d'un processus en cinq \u00e9tapes.<\/p>\n\n\n\n<p><strong>\u00c9quations fondamentales \u00e0 la base de toute estimation de la force de r\u00e9traction d'un disque dur :<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Force de frottement : F = \u03bc \u00d7 W\u2019 \u00d7 L, o\u00f9 \u03bc est le coefficient de frottement, W\u2019 est le poids effectif du tube dans la boue et L est la longueur du segment.<\/li>\n\n\n\n<li>Amplification par cabestan : T2 = T1 \u00d7 e^(mu \u00d7 th\u00eata), o\u00f9 th\u00eata est l'angle de courbure en radians.<\/li>\n\n\n\n<li>Force de traction admissible : F_allow = sigma \u00d7 A, o\u00f9 sigma est la contrainte de traction admissible lors de la pose (environ 1 000 psi pour un tuyau en PE) et A est l'aire de la section transversale de la paroi du tuyau.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li>D\u00e9finissez le trac\u00e9 du forage et le profil g\u00e9otechnique, y compris le type de sol, la nappe phr\u00e9atique et la courbure \u00e0 chaque virage.<\/li>\n\n\n\n<li>Calculez le poids effectif du tube dans la boue de forage, en tenant compte de la pouss\u00e9e d'Archim\u00e8de. Un tube en PE est pratiquement sans poids, voire flottant, dans une boue de 9 \u00e0 10 lb\/gal, tandis qu'un tube en acier ne d\u00e9place qu'une partie de son poids et reste lourd.<\/li>\n\n\n\n<li>Estimer la r\u00e9sistance au frottement par segment en multipliant le poids effectif du tuyau par le coefficient de frottement, puis par la longueur du segment.<\/li>\n\n\n\n<li>Ajoutez une r\u00e9sistance hydraulique et appliquez l'amplification par cabestan \u00e0 chaque courbe, en partant du c\u00f4t\u00e9 de la sortie vers la plate-forme.<\/li>\n\n\n\n<li>Comparez la force de traction totale requise \u00e0 la force admissible : pour les tuyaux en PE, la contrainte de traction lors de la pose est g\u00e9n\u00e9ralement limit\u00e9e \u00e0 environ 1 000 psi (6,9 MPa), ce qui, pour un tuyau de 12 pouces DR 11, correspond \u00e0 une force de traction admissible d'environ 42 000 livres.<\/li>\n<\/ol>\n\n\n\n<p>Exemple concret : un tuyau en PEHD de 12 pouces, DR 11, pos\u00e9 sur une distance de 1 000 pieds dans un sol de nature mod\u00e9r\u00e9e, avec un coude \u00e0 30 degr\u00e9s et une bonne boue. Le frottement du tuyau repr\u00e9sente environ 4 000 lb, la tra\u00een\u00e9e du fluide entre 8 000 et 12 000 lb, l'effet de cabestan environ 2 000 lb et la tra\u00een\u00e9e d'entr\u00e9e-sortie entre 2 000 et 4 000 lb. La force de retrait totale est estim\u00e9e entre environ 16 000 et 22 000 lb (de 7 \u00e0 10 t, soit de 71 \u00e0 98 kN), ce qui repr\u00e9sente 38 \u00e0 52 % des 42 000 lb admissibles pour ce tuyau, une marge confortable mais non n\u00e9gligeable. Pour les tuyaux en acier, le m\u00eame calcul est effectu\u00e9 par rapport \u00e0 une limite de contrainte de traction d\u00e9riv\u00e9e de la limite d\u2019\u00e9lasticit\u00e9 ; la valeur admissible est fix\u00e9e par le code de conception du projet, g\u00e9n\u00e9ralement comprise entre 50 et 90 % de la r\u00e9sistance \u00e0 la d\u00e9formation (SMYS) pour les installations temporaires, tandis que les limites d\u2019exploitation en service selon les normes B31.4 et B31.8 se situent g\u00e9n\u00e9ralement pr\u00e8s de 72 % de la SMYS.<\/p>\n\n\n\n<p>Vous souhaitez faire v\u00e9rifier le calcul de la force de retrait de votre HDD ? Envoyez votre plan de forage \u00e0 l'\u00e9quipe d'ing\u00e9nieurs de JSW pour b\u00e9n\u00e9ficier d'une v\u00e9rification technique gratuite et sans engagement dans un d\u00e9lai de cinq jours ouvr\u00e9s.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-pipe-material-affects-pullback-force\">Comment le mat\u00e9riau des tuyaux influe sur la force de traction<\/h2>\n\n\n\n<p>Le choix du mat\u00e9riau influe davantage sur la force de traction que n'importe quelle autre d\u00e9cision de conception, car il d\u00e9termine le poids du tuyau \u00e0 l'int\u00e9rieur du forage et la tension qu'il peut supporter en toute s\u00e9curit\u00e9. La comparaison ci-dessous refl\u00e8te ce que nous observons dans l'ensemble des projets de forage horizontal dirig\u00e9 (HDD).<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Mat\u00e9riau du tube<\/th><th>Comportement dans le forage<\/th><th>Force de traction typique par rapport au PEHD<\/th><\/tr><\/thead><tbody><tr><td>HDPE (PE 4710 \/ PE 100)<\/td><td>Presque flottant dans la boue, faible coefficient de frottement, grande r\u00e9sistance \u00e0 la traction par rapport \u00e0 son poids ; le mat\u00e9riau standard utilis\u00e9 pour le forage HDD.<\/td><td>Valeur de r\u00e9f\u00e9rence (1,0x)<\/td><\/tr><tr><td>Acier<\/td><td>Lourd en boue ; g\u00e9n\u00e9ralement lest\u00e9 d'eau ou de poids pour contr\u00f4ler sa flottabilit\u00e9, ce qui augmente la force n\u00e9cessaire.<\/td><td>1,5 \u00e0 3 fois<\/td><\/tr><tr><td>Fonte ductile<\/td><td>Lourd et rigide ; n\u00e9cessite une protection soign\u00e9e des joints et une surcoupe plus importante ; rarement utilis\u00e9 pour les forages HDD de grande longueur.<\/td><td>1,5 \u00e0 2,5 fois<\/td><\/tr><tr><td>PVC \/ gaine<\/td><td>Light but low tensile strength; pull limits are strict and joint integrity is the controlling factor.<\/td><td>Similar, but lower allowable<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>HDPE dominates HDD installations precisely because of this combination: it floats in the drilling fluid, so friction stays low, and its allowable pull force is high relative to its weight. Steel is chosen when pressure, temperature or product requirements demand it, and the design must then account for ballasting, heavier rigs and higher pullback force throughout the pull. Water ballasting (flooding the string with water as it enters the bore) is used to control buoyancy and keep the pipe on a stable path, but the added weight raises the effective pipe weight in the mud, which directly increases friction and, with it, the required pullback force and rig class.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-hdd-rig-pullback-capacity-classes-and-matching-the-machine\">HDD Rig Pullback Capacity Classes and Matching the Machine<\/h2>\n\n\n\n<p>Rigs used for horizontal directional drilling are sold and specified by rated pullback capacity, and commercial lineups span roughly 8,000 lb for compact utility drills to more than 550,000 lb for pipeline-class machines, with the largest maxi rigs reaching about 1,300,000 lb (600 t). Matching the machine is a capacity question first and a torque and mud-pump question second.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mini rigs (5,000 to 25,000 lb): service lines, telecom and gas connections, pipe up to about 8 in, short bores.<\/li>\n\n\n\n<li>Midi rigs (25,000 to 100,000 lb): distribution mains and mid-size crossings, pipe from about 12 to 24 in.<\/li>\n\n\n\n<li>Maxi rigs (100,000 to 1,300,000 lb): large-diameter, long-distance and river crossings, pipe from about 24 in upward.<\/li>\n<\/ul>\n\n\n\n<p>Classification boundaries vary between organizations: NASTT and DCA training materials often place the mini-rig ceiling near 100,000 lb. The ranges above follow the field-practice convention used in the planning table in this guide.<\/p>\n\n\n\n<p>Our selection rule is to rate the rig at no less than 1.5 times the predicted peak HDD pullback force, and up to 2 times for uncertain ground or long steel strings. We also check that torque and mud pump flow meet the reaming and fluid plan, because a rig with enough pullback but not enough torque can stall halfway through the job. On a 36 in steel crossing we supported, the design pullback was about 320 t (705,000 lb), so the contractor was required to mobilize a rig rated at 500 t (1,100,000 lb) to hold the 1.6x margin; the monitored peak stayed within about 10 percent of the design value through the most demanding section of the pull.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-to-reduce-pullback-force-in-the-field\">How to Reduce Pullback Force in the Field<\/h2>\n\n\n\n<p>In horizontal directional drilling (HDD), pullback force is not a fixed number; the crew controls it every hour of the pull. These are the measures that consistently lower the load in our projects.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Keep the drilling fluid conditioned and lubricating; viscosity, gel strength and hole cleaning all directly reduce friction and fluid drag.<\/li>\n\n\n\n<li>Ream the hole to a sufficient overcut, typically 1.3 to 1.5 times the pipe OD for HDPE and larger for steel, so the pipe is not squeezed against the wall.<\/li>\n\n\n\n<li>Use staged reaming passes to enlarge the pilot hole gradually instead of one oversized pass.<\/li>\n\n\n\n<li>Support the pipe string on roller stands and guide it into the entry angle so it does not drag on the ground.<\/li>\n\n\n\n<li>Install a swivel between the reamer and the pipe so rotation is not transferred into the string.<\/li>\n\n\n\n<li>Control pull speed, normally 1 to 3 m\/min (3 to 10 ft\/min), because faster pulls increase fluid drag sharply.<\/li>\n\n\n\n<li>Finish the pipe string to fabrication quality before the pull: butt-fused or welded joints, clean surfaces and proper roller support at the entry. Good\u00a0pipe string fabrication\u00a0shows up directly as a stable, low force curve.<\/li>\n\n\n\n<li>Monitor force continuously and stop the pull if the load climbs above the predicted value plus margin; restarting after a stop takes more force than a steady pull, so plan for no unnecessary stops.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pullback-force-faq\">Pullback Force FAQ<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-much-pullback-force-is-needed-for-hdd\">How much pullback force is needed for HDD?<\/h3>\n\n\n\n<p>For most horizontal directional drilling (HDD) installations, the required pullback force falls between 10,000 and 100,000 lb (4.5 to 45 t, 44 to 445 kN). Small utility bores with pipe under 8 in typically need less than 15,000 lb, mid-size pipeline crossings of 12 to 24 in typically need 15,000 to 70,000 lb, and large-diameter steel river crossings can need several hundred thousand pounds.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-pullback-force-for-hdpe-pipe-by-size\">What is the pullback force for HDPE pipe by size?<\/h3>\n\n\n\n<p>Typical HDD pullback force values for HDPE pipe by size are listed in Table 1: 4 in pipe usually pulls at 4,000 to 8,000 lb, 8 in at 9,000 to 16,000 lb, 12 in at 12,000 to 25,000 lb and 24 in at 30,000 to 70,000 lb under moderate ground and conditioned mud. Longer bores, clay ground or tight bends push these values toward the top of each range.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-how-is-hdd-pullback-force-calculated\">How is HDD pullback force calculated?<\/h3>\n\n\n\n<p>The standard method, based on the ASTM F1962 model, sums four components: frictional drag between the pipe and the borehole, drilling fluid drag, the capstan effect at bends, and entry-exit soil drag. The total is then checked against the pipe&#8217;s allowable tensile force, which for PE is usually based on a 1,000 psi installation stress limit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-is-the-maximum-allowable-pull-force-for-hdpe-pipe\">What is the maximum allowable pull force for HDPE pipe?<\/h3>\n\n\n\n<p>The allowable pull force for HDPE depends on wall thickness and material grade. Using the common 1,000 psi tensile stress limit, a 12 in DR 11 pipe allows roughly 42,000 lb, and a 24 in DR 11 pipe allows roughly 150,000 lb. Good designs keep the required pullback force at 50 to 70 percent of the allowable value.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-size-hdd-rig-do-i-need\">What size HDD rig do I need?<\/h3>\n\n\n\n<p>Calculate the predicted peak pullback force first, then select a rig rated at 1.5 to 2 times that value. A 20,000 lb predicted load therefore points to a 30,000 to 40,000 lb class midi rig, and a 100,000 lb predicted load points to a 150,000 to 200,000 lb class maxi rig. Verify torque and mud pump capacity as well.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-why-does-pullback-force-increase-during-the-pull\">Why does pullback force increase during the pull?<\/h3>\n\n\n\n<p>Because the resisting length grows as the pipe enters the hole. At the start only the nose is in the borehole; at the end the full string is inside, so friction and fluid drag act over the entire length. This is why the peak HDD pullback force is always expected near the end of the pull, not the beginning.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-can-drilling-fluid-reduce-pullback-force\">Can drilling fluid reduce pullback force?<\/h3>\n\n\n\n<p>Yes, in two ways: it lubricates the pipe-to-hole contact, lowering the friction coefficient, and its density provides buoyancy that reduces the effective pipe weight. The trade-off is that excessive mud pressure can cause frac-out at the surface, so fluid density and pressure are managed within the geotechnical limits of the crossing.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-what-happens-if-pullback-force-exceeds-the-pipe-s-capacity\">What happens if pullback force exceeds the pipe&#8217;s capacity?<\/h3>\n\n\n\n<p>HDPE can stretch permanently, neck down or lose wall thickness at connections; steel can exceed yield and buckle at bends. Both failures are usually detected too late to reverse, which is why continuous force monitoring against a pre-calculated allowable is a standard requirement on disciplined HDD projects.<\/p>\n\n\n\n<p>Planning a directional crossing and want a second opinion on your pullback force estimate? Send your bore plan to&nbsp;JSW&#8217;s engineering team&nbsp;and we will return a technical review within five working days.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-jsw-supports-hdd-and-pipeline-projects\">How JSW Supports HDD and Pipeline Projects<\/h2>\n\n\n\n<p>JSW is a pipeline engineering and construction partner supporting owners and contractors across the full lifecycle of directional drilling and trenchless work. We provide\u00a0pipeline construction services,\u00a0<a href=\"https:\/\/www.pipetechservice.com\/fr\/trenchless-technologies\/\" target=\"_blank\" rel=\"noreferrer noopener\">trenchless pipeline repair technology<\/a>\u00a0and\u00a0pipeline maintenance services, alongside specialized capabilities that HDD projects depend on, including\u00a0<a href=\"https:\/\/www.pipetechservice.com\/fr\/automated-welding-systems-services\/\" target=\"_blank\" rel=\"noreferrer noopener\">pipeline automatic welding technology<\/a>,\u00a0pipeline cold bending\u00a0and\u00a0pipeline hot tapping and plugging services. Our teams also supply the fabrication and tooling layer of the work, from\u00a0pipeline hot tapping equipment\u00a0and\u00a0pipeline plugging pigs\u00a0to\u00a0pipeline cutting machines\u00a0used to prepare pipe strings on the entry spread.<\/p>\n\n\n\n<p>What distinguishes our support is integrated execution:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>HDD pullback force analysis that starts from your bore plan and geotechnical data, with an auditable calculation record.<\/li>\n\n\n\n<li>Pipe string fabrication and welding that protects the installed pipeline through the pull.<\/li>\n\n\n\n<li>Drilling fluid management that respects environmental limits, plus restoration work that returns the site to a defensible condition.<\/li>\n\n\n\n<li>Engineering data transparency: drilling logs, pullback force monitoring curves, mud records and as-builts delivered with the job.<\/li>\n<\/ul>\n\n\n\n<p>We publish our engineering basis, we document drilling logs and as-builts, and we price contingencies explicitly rather than hiding them. If you are planning a directional crossing or need a second opinion on an HDD pullback force calculation,&nbsp;contact our engineering team&nbsp;with your bore plan and we will provide a&nbsp;<strong>free, no-obligation technical review<\/strong>&nbsp;and a scoped proposal within five working days.<\/p>","protected":false},"excerpt":{"rendered":"<p>Quick Answer Typical HDD pullback force ranges from about 10,000 lb (4.5 t) for small utility bores to more than 500,000 lb (227 t) for large-diameter, long-distance crossings, and most mid-size pipeline installations fall between 20,000 and 100,000 lb (9 to 45 t). It is written for pipeline engineers, contractors and owners planning\u00a0trenchless pipeline installations. [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":6164,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_surecart_dashboard_logo_width":"180px","_surecart_dashboard_show_logo":true,"_surecart_dashboard_navigation_orders":true,"_surecart_dashboard_navigation_invoices":true,"_surecart_dashboard_navigation_subscriptions":true,"_surecart_dashboard_navigation_downloads":true,"_surecart_dashboard_navigation_billing":true,"_surecart_dashboard_navigation_account":true,"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[340],"tags":[139,1258,1262,1259,1261,1260],"class_list":["post-6163","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-directional-drilling","tag-hdd-pullback-force","tag-hdd-rig-pullback-capacity","tag-hdpe-pull-force","tag-horizontal-directional-drilling-pullback","tag-pullback-force-calculation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.5 (Yoast SEO v28.1) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>HDD Pullback Force: Typical Values &amp; Calculation Guide | JSW<\/title>\n<meta name=\"description\" content=\"Wondering what pullback force is required for HDD? 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