Find great deals on eBay for th hill ds Shop with confidence. These are the American Petroleum Institute's RP7G-2, TH Hill Associates' DS-1® and Fearnley Procter's NS-2™. Because of the increase in the number of 'complex' wells being drilled NS-2™ - which is designed specifically for use in this type of well - is being increasingly used. Available exclusively from Bureau Veritas, The DS-1 Fourth Edition School provides a practical, integrated approach for managing the integrity of your drill string structure. The four volumes of DS-1 Fourth Edition serve as the foundation for this three day school, and what you learn will revolutionize your approach to failure prevention.
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