小井眼卡钻现象分析

The Analysis of Undergauge Hole Sticking

田相元¹,王相磊²,曹庆和¹,沈献良³,张古森⁴

Tian Xiangyuan , Wang Xianglei, Cao Qinghe, et al

1.中原油田分公司工程监督中心,2.中原石油勘探局钻井二公司,3. 中原石油勘探局钻井一公司,4. 中原石油勘探局钻井三公司

Engineering Supervision Center , Zhongyuan Oilfield Company , SINOPEC, Henan 457001 , P. R. China

应用弹性力学和材料力学有关理论,对钻井过程中的小井眼卡钻现象进行了分析,建立了小井眼卡钻的力学模型,并对影响小井眼卡钻的各种因素(下放速度、遇阻吨位、井壁摩擦系数、地层因素、钻具几何尺寸及缩径严重程度等) 进行了定量分析,在此基础上,提出了预防和处理小井眼卡钻的具体措施。

This paper analyzes a kind of sticking-undergaugehole sticking , and establishes the mechanical model. According to the model , the main factors that affect thiskind of sticking are the velocity of running the drilling string , the tonnage of touching down the expanding formation section , wall friction coefficient , formation properties , the geometric size of drilling string , the serious degree of formation expanding and so on. In the meanwhile , it calculated the required pulling force that make the stuck pipe free. On the basis of this calculations , it carried out abstractive measures that preclude and deal with this kind of sticking.