环空压耗补偿的确定在SP11-12井的应用
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摘要
在钻井现场中,在连续钻进状态,地层相对稳定、接单根或立柱正常,但一旦起下钻或井筒流体静止时间一长,溢流或井塌现象时有发生。究其原因主要是钻进时,环空压耗作用于井底,井底压力较大,在起钻或空井时,环空压耗消失,若忽视了环空压耗的补偿,井底压力较小,从而出现溢流或井塌现象。
In the drilling site,in the continuous drilling state,the formation is relatively stable,and the single root or column is normal.However,once the trip or the wellbore fluid is stationary for a long time,overflow or well collapse may occur.The main reason is that when drilling,the annulus pressure loss acts on the bottom of the well and the bottomhole pressure is relatively large.When the drilling or emptying well is started,the annulus pressure loss disappears.If the compensation for the annulus pressure loss is ignored,the bottomhole pressure is ignored.Smaller,causing overflow or well collapse.
In the drilling site,in the continuous drilling state,the formation is relatively stable,and the single root or column is normal.However,once the trip or the wellbore fluid is stationary for a long time,overflow or well collapse may occur.The main reason is that when drilling,the annulus pressure loss acts on the bottom of the well and the bottomhole pressure is relatively large.When the drilling or emptying well is started,the annulus pressure loss disappears.If the compensation for the annulus pressure loss is ignored,the bottomhole pressure is ignored.Smaller,causing overflow or well collapse.
引文
[1]龙之辉.钻井循环压耗修正系数方法及应用[J].天然气工业,2005.,7:66-68.