One company, Maersk Drilling, is leading the way with its fleet of three state-of-the-art XLE jack-up rigs – named Intrepid, Interceptor and Integrator, and a fourth known as XLE4 which will be delivered b. [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]
Maoming can be reached by the Maozhan Expressway, which is linked to the Kaiyang Expressway and Fokai Expressway, which leads to the provincial capital, . Guangzhou is a 5 - 6 hour commute from Maoming. Maoming is served by the , which runs east to the provincial capital, the , which runs west to the , and the [pdf]
DTH technique was used in well drilling exclusively to dig, accurate, vertical bores, and rotary drilling was used to turn the hole. The Directional DTH system, patented by Atlas Copco, was first used successf. [pdf]
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