玉门油田青西区块易坍地层井眼坍塌周期研究  

RESEARCH ON BOREHOLE COLLAPSE CYCLE IN QINGXI BLOCK OF YUMEN OILFIELD

作　　者：喻著成[1,2] 

机构地区：[1]中石油西部钻探国际钻井公司 [2]西南石油大学

出　　处：《钻采工艺》2009年第6期12-15,140,共4页Drilling & Production Technology

基　　金：国家自然科学基金项目(编号:50674077)资助

摘　　要：玉门油田地层的岩性复杂,砂岩、砾岩、膏盐岩、石膏质泥岩、白云岩和泥岩分布的规律性差,地层中这些岩性交互出现,加之部分构造中含有厚度差异巨大的推覆体地层,使地质预测的难度大,预测的准确性差,这种复杂地层往往使井身结构设计、建井周期和预期目标相差非常大。由于膏盐岩、石膏质泥岩和泥岩易水化膨胀,导致井周岩石的应力状态将会发生变化,表现为坍塌压力随水化时间和地层到井轴的距离的改变而改变。因此,在考虑水化的情况下,井眼的稳定性不能用固定的坍塌压力值来表示,需要确定地层的修正坍塌压力,进而比较准确的确定坍塌周期。The formation lithology of Yumen Oilfield is complex,and the distribution of sandstone,conglomerate,gypsum-salt rock,mudstone,dolostone and shale is irregular.So,the geologic forecast is difficult,and the forecast accuracy is poor.As compared with forecast result,the casing programme design and actual construction cycle in the complex formation has a very large difference.Because of the expansion of gypsum-salt rock and mudstone,the stress state of rock near the well was changed.Therefore,when hydration was considered,the stability of borehole can not use a fixed collapse pressure value,it is necessary to determine the corrected collapse pressure value of formation,thereby a more accurate collapse cycle was determined.

关 键 词：坍塌周期 岩石力学参数 水化膨胀 井壁稳定性 玉门油田 

分 类 号：TE21[石油与天然气工程—油气井工程]