For decades, American national standards institute ANSI flange design has been for the oil and gas industry is provided one of the sealing technology, and effectiveness.
几十年来，美国国家标准学会设计的ANSI法兰已经为石油和天然气工业提供了壹种适用的密封技术，而且卓有成效。
According to this problem, casing oil stolen prevention sealing valve was developed, matching with down-hole oil-gas separator and gas lift valve lift technology.
针对这一难题，研制了套管防盗油密封阀，并配套应用了井下油气分离器与气举阀助流举升工艺技术。
According to this problem, casing oil stolen prevention sealing valve was developed, matching with down-hole oil-gas separator and gas lift valve lift technology.
针对这一难题，研制了套管防盗油密封阀，并配套应用了井下油气分离器与气举阀助流举升工艺技术。
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