Общество С Ограниченной Ответственностью «Днепропетровский Завод Бурового Оборудования»
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Priority to UAU200813141UpriorityCriticalpatent/UA40191U/en
Publication of UA40191UpublicationCriticalpatent/UA40191U/en
Head comprises body with horseshoe-like lower section, fixation rod and head fixed on the rod. The body has inner short threading that is placed close to the upper end. Fixation rod has respective outer threading arranged as two short sections between which reboring is provided, with diameter smaller than the inner diameter of the threading. The lower part of the rod has shape that corresponds to shape of the inner threading of tool joint. There long slots are provided, those connect the inner cavity of drill strings to reboring on rod that is placed between the lower threading on the rod and the lower part of the rod placed in the threaded part of the joint tool.
Witness tube head assembly to be placed inside a drill string of a drilling apparatus, comprises an upper holding body that has a holding set, a reduced diametral part with a lower coupling part, a lower holding body and a coupler to couple the upper to the lower holding body.