海洋油气开采低产水平井同层侧钻技术的分析与实践

Application of Sidetracking Technology to Same Layer of Inefficient Wells in Offshore Oil and Gas Exploitation

随着油田开发的深入进行,渤海部分区块产量递减加快,出现了一批低产、低效和长期关停井,制约了油田可持续发展。为了使有增油潜力的问题井恢复产能,缓解油田产量压力,渤海油田通过油藏工程、钻完井工程一体化研究,采用少量打捞部分防砂管柱、优选侧钻点、定向井轨迹优化等措施最大化利用老井眼进行水平井同层侧钻作业,并应用新型化学堵漏剂技术替代常规水泥回填技术。最终成功地在绥中油田M平台两口低产井实施,侧钻后产量分别提高155.23%和399.7%。

With the development of oil field scale and the passage of production time, the Bohai Oilfield appears a batch of low production wells and long-term shutdown wells. These similar problems increasing each year make the oil field production decline, the investment increase, and the sustainable development of oil field be seriously restricted. How to introduce a low cost method to recover the capacity of problem wells which have potential to enhance production is an important research subject to remit the oil field output stress and promote the oil field sustainable development. Sidetracking in the same layer technology is suitable for horizontal well whose output is declining due to the reservoir geology and engineering factors. After fishing out a few part of sand control string, combined with the optimal selection of sidetracking points, directional well trajectory optimization, and application of new chemical plugging technology instead of conventional cement backfilling technology, sidetrack drilling can be used in open hole section. The successful application of sidetracking in the same layer technology in SZ 36-1 oil field M platform makes two wells＇ yield increased by 155.23% and 399.70% respectively.