Product Description

Cross-over sub acts for conversion and connection of drill stem component in petroleum , natural gas and geology drilling ***** is used mainly for connecting of upper drill tools and lower drill tools during drilling operations. The cross over sub in 4 types of main structure Sort Description Upper Connection Part Lower Connection Part Type 1 Kelly cross-over sub Kelly Drill pipe A or B 2 Drill pipe cross-over sub Drill pipe Drill pipe A or B 3 Interim cross-over sub Drill pipe Drill collar A or B 4 Drill collar cross-over sub Drill collar Drill collar A or B 5 Drill bit cross-over sub Drill collar Drill bit A or B 6 Swivel cross-over sub Swivel lower sub Kelly C 7 Fishing cross-over sub Kelly Drill pipe C Drill pipe Fishing tools C Type A stand for same diameter :one crossover sub has one size (D)on O.D., code A. Type B stands for reduce type:one crossover sub has two sizes (D1, D2) on O.D., code B. Type C is left hand thread type:the connection thread is left hand type, code C.