Apparatus for dispensing a chemical additive into a well
Ball and plug dropping head
Ball dropping assembly
Ball dropping assembly
Chemical dispensing system
Chemical stick storage and delivery system
Drive for a rotating chemical dispensing apparatus
Feed apparatus for feeding capsular cartridges into drilled...
Method and apparatus to reduce hydrostatic pressure in sub...
Methods and apparatus for use in subterranean cementing...
Pellet dispensing device
Plug-dropping container for releasing a plug into a wellbore
Sphere launcher