"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 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 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...

A closed oil liquid ring gas compression system with a...

A collecting device and a method of using same

A collection device and method of using same