"eze plug" drilled hole plugging device
"twin-impact" double-blow drilling apparatus
.alpha. olefin sulfonate surfactant additives for gas foam...
2-stage underreamer
4-d probe for making geophysical measurements
A bearing plate assembly
A bit retention device for a bit and chuck assembly of a...
A boring head and a roller cutter and a saddle for a boring...
A bottom-hole assembly, and a method and system for...
A bridge plug for use in a wellbore
A cable bolt
A cable bolt
A cable duct device in a swelling packer
A casing and method of installing the casing in a well
A casing transition nipple and method of casing a well to...
A cementing composition including a dispersant agent for...
A centralizer for tubular elements manufactured from two...
A circulating sub apparatus
A circulating sub apparatus and method
A clearance method and device for the oil pumping unit...