钻井作业中泥页岩地层井壁稳定受温度影响的规律研究  

The Effect of Temperature on Wellbore Stability in Shales during Drilling

作　　者：王兴隆[1] 程远方[2] 赵益忠[2] 

机构地区：[1]中联煤层气有限责任公司,北京100111 [2]中国石油大学(华东)石油工程学院,山东东营267061

出　　处：《石油钻探技术》2007年第2期42-45,共4页Petroleum Drilling Techniques

摘　　要：钻井过程中钻井液和地层的温度差会引起近井地带地层温度的改变,这种非等温特性必然会对井壁的稳定性产生影响。详细研究了温度对泥页岩近井地带孔隙压力分布的影响,建立了温度场和地层孔隙压力耦合的多孔弹性模型,给出了温度和孔隙压力的计算公式;应用差分方法求解了温度场-地层孔隙压力耦合模型,分析了近井地带的温度剖面和温度变化引起的近井地带孔隙压力的分布规律,得出了冷却钻井液可以使井壁趋向稳定的结论。The temperature difference between the drilling fluid and formations can alter the near wellbore formation temperature. This non-isothermal property will impact on wellbore stability during drilling. This paper investigated in detail the impact of the temperature on the near borehole pore pressure distribution. The model coupled the temperature field and pore pressure field was created and the equations of calculating the temperature and pore pressure are provided in this paper. The finite difference method was used to solve model coupled the temperature and pore pressure. The temperature profile in the near wellbore region and the pore pressure distribution due to the temperature change were analyzed. The conclusion is that the cooled drilling fluids will stabilize the wellbore.

关 键 词：泥岩 页岩 井眼稳定 温度分布 孔隙压力 耦合 数学模型 

分 类 号：TE21[石油与天然气工程—油气井工程]