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泥页岩渗透水化井壁稳定分析 预览

Analyze of Borehole Wall Stability by the Action of Physical Chemistry
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摘要 钻井过程中,由于水基钻井液化学渗透作用的影响,泥页岩井壁更加不稳定。钻井液与地层水不仅存在压力差,而且还存在渗透水化,这些因素都成为控制泥页岩井壁稳定的重要考虑因素。本文建立力学-化学耦合作用下井壁周围应力分布模型,采用有限差分法求解该模型,得出井壁周围应力分布,利用破坏准则计算井壁坍塌压力,得出合理的防塌钻井液密度,研究井周应力分布和坍塌压力的时间效应,对实际钻井有一定的理论指导意义。 Because of the effects of physical chemistry during drilling,shale borehole wall became more instability.There have been differential pressure and chemical potential between drilling mud and formation water,which play an important role in wellbore stability.The stress distribution model around borehole wall under the mechanical and chemical coupling action was built in the paper.The text used the finite difference approach to compute the model,found stress distribution around the borehole wall,computed caving pressure,and found appropriate drilling mud density to prevent borehole wall caving.Moreover,effects of model parameters on stress distribution have been researched,which make a reference for drilling operation.
作者 刘凯都 刘书杰 文敏 Liu Kaidu;Liu Shujie;Wen Min(CNOOC Research Institute Ltd,Beijing 100028 China)
出处 《石化技术》 CAS 2019年第1期139-140,共2页 Petrochemical Industry Technology
关键词 泥页岩 孔隙压力 岩石应力 坍塌压力 shale pore pressure rock stress caving pressure
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