Improvements in or relating to well-completion apparatus and duct forming devices and terminal tubes therefor
GB1093985A
Improvements in well completion apparatus
DE1278974B
Passage device on casing and riser pipes in boreholes for oil, natural gas, etc. like
DE1278374B
Passage device for piped conveyor holes
GB1063656A
Duct-forming device for borehole assembly
GB728197A
Method of and apparatus for sealing a casing in a bore hole
DE942923C
Method and apparatus for creating connecting channels between the interior of the casing of a borehole and usable layers of earth when cementing the casing
