filling of annulus space 环空充填
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The annulus testing technique, in which the instrument is up and down through the annulus space between the tubing and casing, is regarded as the best testing method at home and abroad.
从抽油井油套环形空间起下下井仪器，直接测试油井生产动态参数的环空测试技术，被公认为是抽油井最佳测试方案。
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