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CT(挠性管)固井已得到广泛应用,并且多年来很成功地应用于补救挤注和回堵作业中。然而,应用此技术的绝大数井的井斜小于90°。阿拉斯加北斜坡Alpine油田的一口长水平井钻于开发初期阶段,并且该井开采长度超出了井网范围。此井需要回堵和侧钻以达到预期的开采策略。本井完钻井深11984ft,用长约2050ft、内径为4·5in的割缝衬管对深2210ft、内径为6·125in的井眼进行了完井。在水平井段中部附近,最大井斜达到96°。固井作业历来被认为是水平井的一大难题。搜索SPE在线图书馆只检索到5篇文章提及该问题,但很少有关于回堵和废弃(P&A)长水平井筒“最实用”方法方面的详细信息。根据在Alpine实施CT挤注方案的成功经验,由数名工程师和油田监督人员组成的工作队应用CT挤水泥技术对水平井筒侧向部分进行封堵,并为后续的侧钻作业留下水泥基础。
CT (flexible tube) cementing has been widely used and has been successfully used for remedial squeeze and plugging operations for many years. However, most of the wells using this technique have a deviation of less than 90 °. A long horizontal well drilled in the Alpine field north of the Alaska borehole was in the early stages of development and the well was being drilled beyond the well pattern. This well requires plugging and sidetracking to achieve the desired mining strategy. The well was drilled 11984 ft deep and completed with a 2210 ft deep borehole with an ID of 6.125 in. Using a slotted liner length of 2050 ft and an inner diameter of 4.5 in. Near the middle of the horizontal section, the maximum well inclination reaches 96 °. Cementing operations have historically been considered a major challenge for horizontal wells. The Search SPE online library only retrieved 5 articles mentioning the issue, but there is very little detail on the “pragmatic” methodologies for backwashing and discarding (P & A) long horizontal wellbores. Based on the successful experience of implementing the CT extrusion solution in Alpine, a team of engineers and field supervisors applied CT grouting technology to block lateral sections of the horizontal wellbore and leave a cement foundation for subsequent sidetrack drilling operations .