不是只有页岩气是一种新的储备能源：在砂岩中的“致密地层天然气”还有在煤层里的甲烷(一种能在矿井里杀死金丝鸟的气体)也十分有前景。
Nor is shale gas the only new sort of reserve: "tight gas" in sandstones and coal-bed methane (the sort of gas that used to kill canaries down mines) are also promising.
本文用模型实验研究了声波在致密碳酸盐岩地层井中的传播特性。
The propagation characteristic of acoustic wave in borehole that penetrates compact carbonate formation is analysed by doing model experiment.
加入交联剂的PVA17 - 88降失水剂的降滤失机理是：在过滤介质与滤饼之间形成一层致密的薄膜，阻止了水泥浆中的水向地层流失。
The filtration mechanism of PVA17-88 crosslinked is that the formation of a fine film between filtrate medium and cake can prevent loss of water in slurry into formation.
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