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专利名称：IMPROVEMENTS RELATING TO DRILLING
APPARATUS
发明人：Ayling, Laurence John申请号：EP15723533.4申请日：20150521公开号：EP3155208B1公开日：20191023
摘要：A drilling apparatus (1) is for use on a rotary drilling rig with a top drive whichenables circulation and rotation of a drill string (3) to continue uninterrupted during themaking of drill string connections. It has a snubber gripping mechanism (10, 9) to enabletool joints (2, 3) to be supported and gripped with a reduced pressure chamber (5)volume and snubbing force, during tool joint connections. The gripping mechanism hasgripping pads (14) arranged to move radially by relative rotation of a drive cylinder (34)causing a tapered surface (36) of the drive cylinder (34) to press against or release thepad (14). A guide cylinder (30) supports and guides the pads (14) and collets (13) forretaining a drill string at an upset shoulder (19).
代理机构：John A. O'Brien & Associates
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