··20石油工程技术2009年3月
要保持井壁稳定必须使抽汲、激动和其他动态压力最小化,同时维持当量循环钻井液密度在安全钻井液密度窗口内。
(4)井壁失稳是多种因素影响的结果,包括钻井作业、钻井液成分及井眼轨迹等。为了有效、综合地评价井壁稳定性,需要大量的钻井信息、区域测量信息、岩石机械属性测量和地应力数据,这些都是构建力学模型的基本信息。
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According%to%the%requirements%for%tackling%key%problems%in%science%and%technology%put%forward%by%the%Eleventh%Five-Year%Program%and%to%resolve%the%difficult%problem%of%carbonate%formation%pore%pressure%calculation%in%Northeastern%Sichuan%Province,%an%approach%for%borehole%stability%analysis%has%been%established.%Based%on%rock%mechanics%tests%to%simulate%geologic%environment,%reasonable%adjusting%parameters%for%rock%strength%have%been%obtained%by%calibrating%rock%strength%and%terrestrial%stress%using%measurement%data%in%the%laboratory.%Methods%have%been%formed%to%calculate%pore%pressure%based%on%the%P-wave%velocity/S-wave%velocity%ratio%and%effective%vertical%stress.%A%drilling%rate%equation%involving%differential%pressure%factor%has%been%developed%in%light%of%definition%of%the%specific%energy%concept%for%rock-breaking%and%rock%drillability%level,%considering%the%influence%of%effective%nozzle%hydraulic%power%and%differential%pressure%on%ROP%and%referring%to%laboratory%experimental%data.%The%safe%drilling%fluid%density%will%decrease%and%even%prevent%downhole%accidents%relying%on%the%whole%set%of%technologies%and%tools%for%borehole%stability%
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