考虑盐岩层蠕变的井身结构设计研究

合理井身结构设计是钻井工程设计的重要组成部分，对于复杂地质条件下的的深井、超深井、盐岩层的影响是国际性的难题，塔里木盆地的轮南、哈里哈塘地区石炭系和英买力地区第三系都埋藏着两套很厚的含膏盐岩层。在钻井过程中，经常发生盐岩层遇阻卡钻，钻井完井后，盐岩层的粘塑性流动又造成深井套管在短期内被挤坏。井身结构设计常规方法已显得力不胜任。在常规井身结构设计的基础上，针对塔里木深井、超深井盐岩层的具体情况，首次建立了一套适合于深井，超深井考虑盐岩蠕变的合理井身结构设计方法，并研制了考虑盐岩蠕变的井身结构设计软件，完成了7口井的井身结构设计。

Study on Casing Program Design Considering the Effect of Salt Bed Creep

Salt bed creep has been a big challenge for casing program design for deep and extra deep wells. It is also the case in the Tarim basin, where there are very thick, gypsum bearing salt beds in the Carboniferous formations of Lunnan and Halihatang areas and in the Tertiary formations of Yinmaili area. During drilling into these formations, sticking of tool was often the case. Shear deformation or breakdown of the casing induced by salt creeping would occur shortly after completion. Therefore, the conventional methods of casing program design cannot satisfy the needs in this basin. In the present work, a method is proposed and the companying software is developed of casing program design for deep and extra deep wells, with salt bed creeping taken into consideration. The method and software have been used in designing the casing program of seven wells and have been proven valid and effective.