气体钻井中温度对致密砂岩破碎影响机理研究  

Study of the Mechanism of Temperature Impact on Tight Sandstone Broken in the Gas Drilling

作　　者：仉洪云[1] 高德利[2] 郭柏云[2] 乔文孝[1] 

机构地区：[1]中国石油大学(北京)地球物理与信息工程学院,北京102249 [2]中国石油大学(北京)石油工程教育部重点实验室,北京102249

出　　处：《新技术新工艺》2015年第6期107-111,共5页New Technology & New Process

摘　　要：针对气体钻井条件下钻遇致密砂岩时的力学特性,考虑井底气体温度的影响,通过理论模型及有限元数值模拟进行井底岩石受力情况分析。结果表明,热应力在井壁附近表现为拉应力,随着地层温度与井底温度之间温度差增大,切向和径向热应力都随之增大。相比较不考虑温度的井底岩石应力分布而言,在井底低温产生的热应力的影响下,井底岩石各向应力减小,温差越大热应力对井底岩石的影响也就越大,井壁发生破坏的可能性也就越大,低温产生的热应力对致密砂岩破坏产生的影响不可忽视。On the basis of a large number of literature investigation, analysis of the engineering thermal physical properties of dense sandstone, tight sandstone in traffic while drilling for gas drilling conditions on the mechanical properties, con sidering the influence of downhole gas temperature, through the theoretical model and finite element numerical simulation a- nalysis of downhole rock stress distribution. The results show that,the thermal stress of tensile stress near the wall, along with the formation temperature and the temperature difference between bottom hole temperature increases, the tangential and radial thermal stress increases. Compared to not considering bottom hole of the rock stress distribution, temperature in bottom hole temperature under the influence of thermal stress of bottom hole rock anisotropy stress decreases, and the big- ger the temperature difference between the thermal stress of the greater by the influence of bottom hole rock, walt damage occurred, the greater the likelihood the heat produced by low temperature stress on the impact of tight sandstone damage can not be ignored.

关 键 词：气体钻井 致密砂岩 温度场 热应力 

分 类 号：TE21[石油与天然气工程—油气井工程]