深水钻井司钻法压井过程中立管压力和地层受力变化规律

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1、第37卷第5期石油钻采工艺Vol.37No.52015年9月OILDRILLING&PRODUCTIONTECHNOLOGYSept.2015文章编号：1000–7393（2015）05–0014–03doi:10.13639/j.odpt.2015.05.004深水钻井司钻法压井过程中立管压力和地层受力变化规律张　艳　翟晓鹏（长江大学石油工程学院，湖北武汉　430100）引用格式：张艳，翟晓鹏.深水钻井司钻法压井过程中立管压力和地层受力变化规律［J］.石油钻采工艺，2015，37（5）：14-16

2、，21.摘要：深水钻井地层破裂压力低、钻井液密度窗口窄，溢流时采用司钻法压井，往往未控制溢流却又诱发井漏事故。因此采用深水司钻法压井时地层受力显得尤为重要。考虑节流管汇影响，利用流体动力学，建立了深水钻井司钻法压井立管压力和地层受力计算模型，分析了深水司钻法压井中立管压力和地层压力变化规律，给出了司钻法压井过程中累计泵入长度对应的立管压力、套压、地层受力变化曲线，结合地层破裂压力极限值，确定压井过程中最优压井排量。对于压井排量和钻具组合相同的情况，司钻法压井时，套管鞋越深，套管鞋处地层受力越大；深度

3、大的套管鞋位置出现最大压力时间要早于深度小的套管鞋位置；当天然气柱顶部达到井深某处时，某处地层受力最大；当天然气柱顶部达到井口时，套管压力最大，并且地层受力最大值总是早于套管压力最大值。关键词：钻井；司钻法；立管压力；节流压力；压井中图分类号：TE52　　　文献标识码：AChangelawofstandpipepressureandformationstressduringwellkillingbydrillermethodindeepwaterdrillingZHANGYan,ZHAIXiangp

4、eng（PetroleumEngineeringSchoolofYangtzeUniversity,Wuhan430100,China）Abstract:Duringdeepwaterdrilling,theformationbreakdownpressureislowandthewindowofdrillingfluiddensityisnarrow,sowhendriller’smethodisusedtokillawellforwellkicks,theresultisthatthekicki

5、snotcontrolledbutlostcirculationincidentmaybeinduced.Hence,formationstressseemsparticularlyimportantwhendriller’smethodisusedforwellkillingindeepwaterdrilling.Thispapertakesintoaccounttheeffectofchokemanifold,usesfluiddynamicstobuildamodeltocalculatest

6、andpipepressureandformationstresswhendriller’smethodisusedtokillawellindeepwaterdrilling.Also,thispaperanalyzesthevaryingpatternofstandpipepressureandformationstressduringwellkillingbydriller’smethodindeepwaterdrilling,providesthechangingcurvesofstandp

7、ipepressure,casingpressureandformationstressrelativetocumulativepumpinglengthduringwellkillingbydriller’smethod,anddeterminestheoptimalkillrateduringwellkillinginconjunctionwiththelimitofformationbreakdownpressure.WhenthekillrateandBHAarethesame,thedee

8、perthecasingshoeis,thegreatertheformationstressisatthecasingshoeduringwellkillingbydriller’smethod.Theoccurrenceofmaximumpressureatthecasingshoeofgreatdepthisearlierthanthatsmallerdepth.Whenthetopofgascolumnreachescertainpointinthehole,