Anti-Collision Technology for Drilling Cluster Wells in the Artificial Island of Jidong Oilfield
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摘要: 冀东油田人工岛丛式井井网密度大，钻进中易发生井下碰撞问题，为解决该问题，研究了防碰技术。通过分析冀东油田人工岛丛式井的钻井技术难点，提出了针对性技术措施：正钻井碰撞高风险井段使用牙轮钻头；应用低刚性钻具组合，使井下钻具获得更大的挠度变形空间；进行随钻MWD磁场强度监测，根据磁场强度异常值判断正钻井与邻井套管的距离，预警碰撞风险，指导正钻井防碰。综合这些技术措施形成的冀东油田人工岛丛式井钻井防碰技术，在冀东3号人工岛丛式井组进行了应用，降低了钻进中发生井下碰撞的概率，表明该技术是防止正钻井与邻井套管碰撞的有效技术，可为冀东油田人工岛加密钻井提供安全保障。Abstract: Due to high-density well spacing for cluster wells in the artificial island of Jidong Oilfield,there was a high likelihood of down-hole collision problems.Therefore,anti-collision technology was studied for solving this drilling problem.By analysis of drilling technological difficulties of cluster wells in the artificial island of Jidong Oilfield,specific technical measures were put forward:cone bits were used at a specific locations to minimize the risk of collision while;low rigidity bottom hole assembly was applied to make down-hole drilling tools have more deflection deformation space;MWD magnetic field intensity monitoring while drilling was carried out and anti-collision drilling was guided by programming a pre-warning casing distance risk for downhole adjacent wells by detecting magnetic field intensity anomalies.Thus,the anti-collision technology of cluster wells in the artificial islands of Jidong Oilfield was developed by integrating these technical measures and applying them in cluster well groups for the artificial islands of Jidong No.3,thereby reducing the downhole collision probability while drilling.To summarize,this study showed that this anti-collision technology is effective for preventing drilling collisions with casings of adjacent wells and can provide safety assurance for infill drilling in the artificial islands of the Jidong Oilfield.
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Keywords:
- cluster wells /
- drilling /
- anti-collision /
- monitoring while drilling /
- artificial islands /
- Jidong Oilfield
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