One of the early theories of the origin of oil suggested that this black substance was nothing more than ... whale urine that settles on the bottom of the oceans, and then penetrates into the earth's interior through underground channels. In the study of the origin of oil, there is also an alien trace. At the...
The derrick is a key component of the drilling rig equipment and is designed to perform the following functions: handling tripping operations with drill pipes and casing pipes; maintaining the drill string on the traveling system during drilling with unloading; placement of a set of drill pipes and drill collars (DC) and thick-walled drill pipes (TBT); accommodation of the...
