50 and 51 the arms are duplicated at each end of the rollers and there are two rollers per arm the resulting four rollers 48 and 49 can be forced against the upper drill pipe 40 by hydraulic or pneumatic actuators acting on the arms 50 and 51 the rollers are also geared together so that they can be rotated in the same direction by a hydraulic or pneumatic rotary activator 52 the upper drill pipe 40 may thus be rotated by the rollers to disconnect the threads completely the upper drill pipe is then lifted to allow the mud to escape into the sealed cylindrical contained formed by the closed shells 201 202 after draining via connection 46 the shells 201 and 202 can then be opened and the whole assembly comprising a mud bucket and spinner withdrawn ready for the next cycle of operation in general the third embodiment of the invention uses a rigid frame 120 to support a mud bucket and facilitate the accurate operation of the mud bucket relative to the frame thereby making it easier to deploy the mud bucket automatically by a remote linkage so that the mud bucket is safer to install as shown in fig5 frame members 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1030 1031 and 1032 among others are preferably connected together to form frame 120 frame 120 preferably includes closed vertical sides 1000 1001 1004 open vertical side 1005 top 1003 and bottom 1004 frame side 1000 has the shape of a closed polygon with edges 1020 1021 1022 and 1023 defined by frame members 1010 1016 1012 1017 respectively frame side 1001 has the shape of a closed polygon with edges 1022 1026 1024 and 1025 defined by frame members 1012.