| 2. | Drilling time will be lasted and lateral force on casing exerted by drill pipe will increase in case of drilling deep well , ultradeep well , high inclined hole , extended reach well and horizontal well , therefore , friction and wear between casing and drill pipe became a severe problem
在深井、超深井、大斜度井、大位移井及水平井中，钻井时间延长、钻柱作用在套管上的侧向力增高，因此套管和钻柱的摩擦与磨损问题越来越突出。 |
