Objective To test a modified otologic drill under different drilling conditions for its ability to identify drilling faults and stop drilling.Methods Based on force analysis and previous works,an otologic drill was mo...Objective To test a modified otologic drill under different drilling conditions for its ability to identify drilling faults and stop drilling.Methods Based on force analysis and previous works,an otologic drill was modified and equipped with three sensors.Under various conditions,the drill was used to simulate three drilling faults and normal drilling,and signals from the drill were analyzed to extract the characteristic signal.A multi-sensor information fusion system and a stop program were designed to recognize drilling faults and stop drilling.Results Signals from each sensor changed consistently in response to drilling condition changes,with high repeatability and regularity.The average identification rate was 72.625%,68.575%,70.5% and 81.3% respectively for the three simulated drilling faults and normal drilling.The stop program stopped drilling in 0.2～ 0.3 seconds when a drilling faults was detected.Conclusions This study shows that the forces acting on the drill bit change predictably in the three simulated drilling conditions;that using suitable BP neural networks,the drilling faults can be reliably identified,and that a stop program based upon characteristic signal recognition can stop drilling quickly upon detecting drilling faults.This lays a foundation for development of a system capable of predicting drilling faults and automatic drill control.Further studies are being undertaken for practical application of such a system.展开更多
钻井船漂浮在海面上时摇摆幅度大,相对固定式钻井船不能承受很大的倾覆力矩。甲板使用面积小,工作位置范围小,当风从燃烧器向平台方向吹时,燃烧器燃烧原油、天然气等易燃混合气体时散发的大量热能会辐射到船上。当热辐射强度过大时,会...钻井船漂浮在海面上时摇摆幅度大,相对固定式钻井船不能承受很大的倾覆力矩。甲板使用面积小,工作位置范围小,当风从燃烧器向平台方向吹时,燃烧器燃烧原油、天然气等易燃混合气体时散发的大量热能会辐射到船上。当热辐射强度过大时,会对在甲板上的工作人员造成伤害。文章将发明问题解决理论(Theory of the Solution of Inventive Problems,TRIZ)的功能模型分析和因果链分析、技术冲突矩阵和物理矛盾法等工具应用于钻井船的燃烧臂设计,设计出一种适用于钻井船的基座式回转变幅燃烧臂。展开更多
基金supported by Beijing Municipal Natural Science Foundation(4092027)
文摘Objective To test a modified otologic drill under different drilling conditions for its ability to identify drilling faults and stop drilling.Methods Based on force analysis and previous works,an otologic drill was modified and equipped with three sensors.Under various conditions,the drill was used to simulate three drilling faults and normal drilling,and signals from the drill were analyzed to extract the characteristic signal.A multi-sensor information fusion system and a stop program were designed to recognize drilling faults and stop drilling.Results Signals from each sensor changed consistently in response to drilling condition changes,with high repeatability and regularity.The average identification rate was 72.625%,68.575%,70.5% and 81.3% respectively for the three simulated drilling faults and normal drilling.The stop program stopped drilling in 0.2～ 0.3 seconds when a drilling faults was detected.Conclusions This study shows that the forces acting on the drill bit change predictably in the three simulated drilling conditions;that using suitable BP neural networks,the drilling faults can be reliably identified,and that a stop program based upon characteristic signal recognition can stop drilling quickly upon detecting drilling faults.This lays a foundation for development of a system capable of predicting drilling faults and automatic drill control.Further studies are being undertaken for practical application of such a system.
文摘钻井船漂浮在海面上时摇摆幅度大,相对固定式钻井船不能承受很大的倾覆力矩。甲板使用面积小,工作位置范围小,当风从燃烧器向平台方向吹时,燃烧器燃烧原油、天然气等易燃混合气体时散发的大量热能会辐射到船上。当热辐射强度过大时,会对在甲板上的工作人员造成伤害。文章将发明问题解决理论(Theory of the Solution of Inventive Problems,TRIZ)的功能模型分析和因果链分析、技术冲突矩阵和物理矛盾法等工具应用于钻井船的燃烧臂设计,设计出一种适用于钻井船的基座式回转变幅燃烧臂。
