All atoms except hydrogen contain three basic subatomic particles: 1) electrons, 2) protons, and neutrons. Neutrons and protons are found at the center of the atom within a dense region called the nucleus.. [pdf]
Transocean was formed as a result of the merger of Southern Natural Gas Company, later , with many smaller drilling companies. In 1953, the -based Southern Natural Gas Company created The Offshore Company after acquiring the joint drilling operation DeLong-McDermott from DeLong Engineering and . In 1954, the company launched Rig 51, the first mobile , in the. [pdf]
A down-the-hole drill, usually called DTH by most professionals, is basically a screwed on the bottom of a . The fast hammer action breaks hard rock into small cuttings and dust that are evacuated by a fluid (air, water or ). The DTH hammer is one of the fastest ways to drill hard rock. The system is thought to have been invented independently by Stenuic. [pdf]
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