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针对大位移井由于大斜度井段长容易导致井眼不清洁的状况,提出采用井下工程参数测量仪(PWD)所获取的井下环空压力进行井眼不清洁的早期识别。首先分析了引起大位移井井眼不清洁的原因,随后指出井眼不清洁时井下环空压力变化特征,并通过实测环空压力与理论计算值之间差值识别法以及环空压力概率密度识别法进行井眼不清洁的综合识别。利用上述理论分析,编制了相应的计算程序,对某大位移井钻井实际数据进行了现场测算,根据计算出的井眼不清洁综合识别指数Ed值的大小及时采取了相应措施,证明该方法可以实现井眼不清洁的早期识别报警。
Aiming at the reason that the borehole is easy to be clean due to the large deviated well length, a wellbore annihilation pressure obtained by the PWD is proposed to identify the wellbore unclean. Firstly, the reason of wellbore causing large displacement is analyzed, and then the variation characteristics of downhole annulus pressure when borehole is not clean are pointed out. Through the difference identification between measured annular pressure and theoretical value and the probability density of annular pressure, Identification method for wellbore identification. Based on the above theoretical analysis, a corresponding calculation program has been compiled and the actual drilling well data of a large displacement well have been measured on site. Corresponding measures are taken in time according to the calculated Ed value of borehole comprehensive cleaning index, which proves that the method can Early warning of wellbore annoyance.