汶川地震前后，普光气田出现套管非正常变形，而常规理论无法解释这一现象。通过地震活动性和地震载荷分析得出，汶川地震是普光气田套管变形的一个重要因素，地震载荷引起静态应力变化和动态载荷，造成断层滑动、层间变形不协调和盐膏层蠕变加剧，从而套管变形。该研究还得到几点启示，不但应力大小会影响套管变形，应力的变化同样具有重要影响。在地震活动区钻井，须重视构造应力变化的影响。

Well casings of Puguang Gas Field took place abnormal deformation before and after Wenchuan Earthquake, but the conventional theory was unable to explain it. By seismicity and seismic load analysis, it was concluded that Wenchuan Earthquake was an important factor to the deformation. Seismic load caused static stress change,dynamic load, fault slip, inconsistent deformation between stratums, salt/gypsum creep speedup and casing deformation. The analysis showed that not only the stress size affected the deformation, but also the stress change imposed important influence. Drilling in seismic area should pay attention to the effect of structural stress change.