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《Journal of Oil and Gas Technology》 2014-11
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Time Response Analysis of Unstable Flow in Annulus Affected by Back Pressure Change

LYU Zhenhu;CHEN Ping;MA Tianshou;State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Southwest Petroleum University;  
As a type of Constant Bottom Hole Pressure(CBHP),fine managed pressure drilling controlled bottom hole pressure in real-time through applying wellhead back pressure.The change of wellhead back pressure would cause drilling fluid circulation to undergo the transition of stable-unstable-stable process,and the response time of transition period was an important indicator to evaluate fine controlled pressure drilling.Shorter transition time could quickly restore the balance of the bottom hole pressure,thereby it could improve the precision of MPD.The transient flow time of drilling fluid in annulus after the change of back pressure was taken as an object of study,a model was established for response time of the managed pressure.The influential law of gas volumetric fraction,cuttings volumetric fraction,annular gap and the size of back pressure on transition time was analyzed.The analysis shows that the with the increases of gas volumetric fraction,cuttings volumetric fraction,response time,annular gap and back pressure,the response time of the controlled pressure decreases,in which the gas volumetric fraction is the main factor influencing the response time of controlled pressure,at the same time I the difference of the elastic control pressure calculation model is contrasted with that of the new model in the study,it is found out that the rigid calculation model used for easy calculation of controlled pressure in shallow and exploration wells is obtained,which can meet the requirements of calculation precision,also it has stronger operation ability.
【Fund】: 国家科技重大专项(2008ZX05002-005-005HZ)
【CateGory Index】: TE249
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