Drilling rigs can be mobile equipment mounted on trucks, tracks or trailers, or more permanent land or marine-based structures (such as oil platforms, commonly called 'offshore oil rigs' even if they don't contain a drilling rig).OverviewA drilling rig is an integrated system that , such as oil or water wells, or holes for and other construction purposes, into the earth's subsurface. Drilling rigs can be massive structures housing eq. .
Until were developed in the late 19th century, the main method for drilling rock was muscle power of man or animal. The technique of oil drilling through or has its origi. .
and drilling rigs are used not only to identify geologic reservoirs, but also used to create holes that allow the extraction of oil or natural gas from those reservoirs. Primarily in onshore oil and gas fields once. [pdf]
During the 12th Five-Year Plan period, with the support of national oil and gas special projects, CNPC special projects and other projects CNPC independently developed a series of core technologies and equi. [pdf]
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