The causes are presented as follows: packer unloading pressure, formation damage, oil tool plugging, formation voidage, the worst formation physical properties and the effect from vicinage wells.
地
污染或工具堵塞;地
欠压;地

极差;邻井影响等。
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The idea dates back to the 1970s, when researchers first proposed using sound waves to study ocean warming—because the speed of sound through water depends on the physical properties of that water, which are related to temperature.
这个想法
追溯到20世纪70年代,当时研究人员首次提出利用声波来研究海洋变暖——因为声音在水中
传播速度取决于水
物理特性, 而这些特性与温度有关。