Currently, Tahe Oilfield simplify a large group of well structure made of three open wells, such wells type II opened up long naked eye 4500-4800m, in the current drilling cycle is extremely tense situation, two open drilling speed appears particularly important, some of this work area well team using a non- standard carbide drill ( 5 " ,5 -1/ 2" ) for drilling , to increase displacement to meet the needs of the upper strata drilling .

In addition , there is the old well sidetrack section 7 "casing to the wellhead window wells, such wells if full well section using 3-1/2" drill , carbide drill for tensile strength is not a small test, furthermore , small water displacement of small eyes , high pressure pumps , pressure on the ground pipeline 360 DTH hammer is relatively large , it can not meet the needs of carrying sand mine , the introduction of such wells 4 " non-standard drill can be good to alleviate the above mentioned problems .

Are non-standard double shoulder drill pipe drill flood the eye , increase when compared with a conventional drill and the inner diameter of the reduced outer diameter of the joint , thereby reducing the pressure loss and the circulating loop inside the pneumatic drill carbide consumption , larger the water capacity of the eye to improve the efficiency and pumping the drill string , increasing the capacity of the drill string from a variety of cable equipment . Also double step design makes makes more uniform stress distribution at both ends buckle can share the load , reducing the stress concentration at the junction ; improved fatigue resistance High Air Pressure Drill Bits , thus prolonging life.

In such drilling site is being used to understand (TK347, TH9211-1, S41-1C2, TH12177CH), such use carbide drill team at the well in good condition . At present, because of the limited number of non-standard drill pipe Taper Button Bit , can not meet the needs of all wells team .


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