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《Natural Gas Industry》 2016-01
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Design of continuous circulating sub for gas drilling and the mechanical analysis on the sub body

Feng Ding;Sun Qiaolei;Xia Chengyu;Zhang Hong;Chen Min;Tu Yiliu;Hubei Cooperative Innovation Center of Unconventional Oil and Gas,Yangtze University;Oil and Gas Drilling and Well Completion Tools Research Center,Yangtze University;School of Mechanical Engineering,Yangtze University;  
Gas drilling,as an important part of underbalanced drilling,can increase drilling speed.But in the process of conventional gas drilling,it tends to cause cutting settlement,borehole collapse,sticking and other safety hazards may occur because gas circulation must be interrupted.Therefore,this paper presents a continuous circulating sub which can be installed and removed easily.With this sub,gas circulation will not be interrupted when drilling tools are connected and removed.This sub is composed of body,main valve,bypass valve and side entry sub.The structure design of its key components(i.e.main and bypass valves) were fulfilled.Based on statics analysis on the sub body,its force situations under extension,torsion and internal pressure were simulated by using ANSYS finite element analysis software.It is shown that its stress distribution trend is consistent with its elastic-plastic mechanics analysis results.Stress concentrates around the two round holes of the sub body,and the maximum deformation amount is still at the stage of elastic deformation.The analysis results are in line with the elastic-plastic mechanics analysis results,and the requirement of body strength is satisfied.This paper provides a new program to guarantee the drilling safety of extended-reach wells,underbalanced wells and narrow-density window wells.
【Fund】: 国家自然科学基金项目(编号:51405032;51275057);; 湖北省教育厅科学研究计划中青年人才项目(编号:Q20151301)
【CateGory Index】: TE242
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