The Ocean Ranger was a mobile offshore drilling rig that sank near Canada in February 1982 while drilling an exploratory well for Mobil Oil of Canada. The evening of February 14, 1982, Ocean Ranger an. [pdf]
In the North Sea, the Maersk drillship Gallant has drilled to an even greater depth. In August, the company reported that at a total depth of 5,941 metres, it had beaten the record for the deepest well ever d. [pdf]
Positive displacement motors were introduced in the 1960s. The first positive displacement motor (PDM) was the DynaDrill, a high-speed, low-torque motor. After we have explained downhole drilling mud. [pdf]
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