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.
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美
- 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。