The transmutation of oil well cannula due to work of PPI (Pressurized Partition Implement) with a type of lock tile was measured using electromotive strain method.

• 在卡瓦式封隔器工作时；用应变电测法测量了油井套管变形.；测量结果表明:套管局部应力场已经达到深度屈服；局部变形明显;