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随着勘探开发的地质目的要求越来越高,工艺技术逐渐精细化发展,密闭取心技术运用越来越广,但在稳定性较差井段进行密闭取心较为少见。大港油田王官屯油区官104断块目的层取心设计在孔一段,地层稳定性差,易跨易漏,岩心易碎,严重影响取心成功率和收获率,密闭率难以保障,密闭取心难度极大。该区块井:官78-28-2井设计在失稳地层连续取心,设计密闭取心进尺75 m。施工中共计取心12趟,期间共发生漏失3次。该井采用了特殊地层钻井液控制技术、井壁强化堵漏技术,运用合理的取心工艺技术完成了连续密闭取心,密闭取心收获率为93.30%,密闭率为88.46%,超过取心设计要求,最终确保了易漏层连续密闭取心质量合格,为同类井的施工提供了经验。
With the increasing geological requirements of exploration and development, the process technology has been gradually refined. The application of closed coring technology is more and more widely used. However, it is rare to conduct closed coring in poor stability wells. The coring design of the target layer of Guan 104 fault block in Wanggutun Oil Region, Dagang Oilfield is of a section of Kongdian Block. The stratum is poor in stability, easy to leak easily and the core is fragile, which will seriously affect the success rate and yield of coring and the confinement rate difficultly. great. The block wells: Guan 78-28-2 wells designed to continuously coring in unstable stratum, the design of the closed coring footage of 75 m. During the construction, a total of 12 times of corollary work, during which a total of 3 leakages occurred. The well used special formation drilling fluid control technology, wall plugging technology, using reasonable coring technology to complete a continuous closed coring, closed coring rate was 93.30%, airtightness was 88.46%, more than coring The design requirements ultimately ensure that the quality of the continuous leak-tight coring is acceptable and provide experience for the construction of similar wells.