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用一根带有双台肩钻具接头的4in(102mm)钻杆柱可取代5in(127mm)和3 1/2in(89mm)钻杆,既能钻单底水平井又能钻完一口常规井。对4in钻杆的选择、稳定性和成本等方面进行了详细分析。
Instead of 5in (127mm) and 3 1 / 2in (89mm) drill rods, a 4in (102mm) drill string with a double shoulder drill joint can drill both a single horizontal well and a conventional well . The 4in drill pipe selection, stability and cost aspects of a detailed analysis.