川7-5型(不投球)取心工具

Chuan 7-5 (Non-drop Ball) Coring Tool

川7-5型(不投球)取心工具用于φ190mm～φ244mm井眼。该工具创新设计了新型悬挂体组合件、自动卸压机构和大螺距高强度螺纹,成功解决了使用带内防喷工具钻具组合条件下取心时无法投球的技术难题,增强了取心工具井下工作的可靠性和安全性。采用该取心工具在海外土库曼阿姆河右岸区块和国内川渝地区多口高压高含硫井及欠平衡钻井应用,获得平均岩心收获率95%以上、最高单筒进尺27m的成绩。现场应用表明,该型工具抗拉、抗扭强度大幅提高,使用寿命延长,不仅可替代现有的其他取心工具在常规井取心作业,还适用于欠平衡钻井取心,以及"三高"和复杂井取心作业,具有较好的推广应用前景。

Chuan 7-5 (non-drop ball) coring tool is mainly used for coring in the φ190mm φ244mm hole.The innovative designs are the new suspension assembly,the auto-pressure relief device and the high tension thread,which solve the technical problems that the coring tool cannot drop ball while the drill string assembles the float valves,and enhance the coring tool’s reliability and security while working downhole.The coring tools have been applied to many wells featuring in high H2S,high pressure or underbalanced drilling in Turkmenistan,Sichuan and Chongqing,with the average core recovery higher than 95%,and the highest single-barrel footage being 27m.Field application shows that this type of tools has such advantages as higher resistance to pulling and torsion,and extended endurance.It can not only be used to replace other tools for conventional well coring operations,and for underbalanced drilling coring,but also for 'three high' and complex well coring.This type of coring tools has broad prospect for application.