霍沃斯先生将在水力压裂法和其它非传统天然气开采技术中返排和钻出过程中所泄露的甲烷包含在了其计算中。
Mr. Howarth included methane losses associated with flow-back and drill-out processes in hydraulic fracturing and other unconventional gas drilling techniques.
但油井在压裂过程中产生的压裂返排液已成为当前油田水体污染源之一。
However, it produces the fracturing liquid in fracturing, which has become one of the current oil field water pollution sources.
采用新型入口的直流式水力旋流器比返流式水力旋流器压降低，处理量大且分离效率略低；
Moreover, the uniflow hydrocyclone has the traits of big capacity, low pressure drop and a little low separation efficiency in contrast to the returned flow hydrocyclone.
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