大斜度井围岩应力和位移的粘弹性分析

THE ANALYSIS OF ROCK STRESS AND DISPLACEMENT OF THE SURROUNDING WALL OF INCLINED WELLBORE

黄荣樽 白家祉 周煜辉 刘玉石

Huang Rongzun Bai Jiazhi Zhou Yihui Liu Yushi

石油大学 北京石油勘探开发科学研究院

大斜度井井眼钻成后,由于岩石蠕变而常发生井眼缩径,使钻具、套管和测井仪器难以下到井底。本文应用粘弹性理论,对大斜度井井眼周围岩石的应力和位移进行了分析,推导出井眼径向位移与井斜角、井眼方位、稳定周期及钻井液密度的关系式,并导出在给定条件下,求解钻井液密度和稳定周期的计算公式。本文的分析和给出的计算公式对钻井设计和施工具有指导意义。

Because of the well size shrink caused by rock creeping,the drillstem,casing and log instrument can’t be run into the bottom of the hole freely.The analysis of the rock stress and displacement of the surrounding wall of the inclined wellbore is prasented.The relation formula of the radial displacement,inclination,azimuth,stabilizing cycle and fluid density is derived with the theory of rheology.The formula between the fluid density and stabilizing cycle is given out under the given condition.The conclutions have guiding significance for the well desing and drilling operation.

10.3969/j.issn.1000-7393.1994.05.001