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.

　
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  • 在卡瓦式封隔器工作時(shí)；用應變電測法測量了油井套管變形.；測量結果表明:套管局部應力場(chǎng)已經(jīng)達到深度屈服；局部變形明顯;
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