Prior to the mid-1980's, methane from coal seams was classified as an uneconomic resource - one of vast potential, but low value due to poor recovery rates and high associated water production.
在此之前的1980年代中期，从煤层甲烷被列为非经济资源-一个潜在的巨大的，但由于贫困低价值和高回收率有关水的生产。
The heterogeneity of sand-body caused water' s breakthrough in high permeability area and produces remaining oil in low permeability part.
③砂体非均质严重，在高渗透地带造成水窜，在低渗透地区形成剩余油。
A new kind of effective ZS flocculate with oxidation and coupling was prepared for waste water produced from oilfield containing high quantity of fe, s etc.
针对油田污水富含还原腐蚀性的铁、硫等物质，研制开发出一种新型高效氧化偶合絮凝剂ZS。
A new kind of effective ZS flocculate with oxidation and coupling was prepared for waste water produced from oilfield containing high quantity of fe, s etc.
针对油田污水富含还原腐蚀性的铁、硫等物质，研制开发出一种新型高效氧化偶合絮凝剂ZS。
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