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在路易斯安那州南部Chachalou-la盐丘油田附近钻常规井,由于地处湿地,需要从中央平台定向钻井。这些井经常会发生井壁失稳和漏失等井下故障,有些井采取多层侧钻钻达目的层,另一些井则未钻达目的层即弃井。对此,用套管钻井(CwD)技术钻了两口井,井深与采用常规技术所钻的邻井相似。两口井成功地钻达目的层,与邻井的平均成本相比,第二口井节省了25%的费用。两口CwD井均采用旋转导向技术进行定向控制,钻过严重倾斜的岩层。套管钻井作业包括注水泥回填、侧钻,以及两次打捞作业回收发生故障的井下工具。上述作业期间均未起出套管,体现出套管钻井技术的多功能性。
Conventional wells are drilled near the Chachalou-la salt fields in southern Louisiana, which require directional drilling from the central platform due to the wetlands. In these wells, wellbore failures such as instability and loss of the wellbore often occur. Some wells use multiple sidetracks to reach the target formation while others do not reach the target formation, ie, abandoned wells. In this regard, two wells were drilled using CwD techniques, similar to wells drilled using conventional techniques. The two wells successfully drilled to the target level, saving 25% of the cost of the second well compared to the average cost of the adjacent wells. The two CwD wells were all directional controlled using rotary guidance technology and drilled through heavily inclined rock formations. Casing drilling operations include cement backfilling, sidetracking, and downhole tools that fail during two recovery operations. During the above operations have not played casing, reflecting the versatility of casing drilling technology.