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自1997年以来,ConocoPhillips大陆石油公司在Lobo地区有一项多用途钻机研发的长远计划,现已在Webb和Zapata郡钻了120多口井,进尺487681m。这项开发计划要求在6年多的时间里钻900多口井。到2001年为止,实践证明用常规的方法难以进一步提高效率,必须提高钻进效率来拓展开发的潜力。建井成本受三个关键问题的影响:井漏、卡钻和下套管的时间,随钻下套管允许在钻进的同时下套管,此设计无需将钻柱起出井眼。5口随钻下套管井的试验成功,致使ConocoPhillips大陆石油公司在南得克萨斯广泛应用这项技术。其他作业者也在此区域开展了此技术的应用。
Since 1997, ConocoPhillips Continental has a long-term plan to develop multi-purpose rigs in the Lobo area. It has now drilled more than 120 wells in Webb and Zapata counties with footage of 487,681m. This development plan calls for more than 900 wells to be drilled in more than six years. As of 2001, it has proved difficult to further improve the efficiency by conventional methods, and drilling efficiency must be increased to expand the development potential. Well construction costs are affected by three key issues: Lost circulation, stuck-on and under-casing time. Casing-on-go allows casing to be drilled while drilling without the need to lift the drill string out of the wellbore. The success of the five-hole cased-hole well drilling test led ConocoPhillips Continental to make extensive use of this technology in southern Texas. Other operators also apply this technology in this area.