The problems of gravel pack, cementing and perforation are dwelled upon in special.

特别对砾石充填、固井和射孔等方面的问题作了较详细的讨论。

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A metal filter assembly used to support and retain the sand placed during gravel pack operations.

在砾石充填作业期间放置的为支承和挡住砂子所用的由金属制成的过滤装置。

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The flow rate, perforation radius and shot density are the key parameters influencing the pressure drop across gravel pack.

分析结果还表明，油井产量以及射孔孔径和孔密度是影响砾石层压降的重要因素。

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Hirvonen and Loeb both slowed dramatically on the first day's final stage in order to avoid being the first cars on the road on Saturday, when they anticipated loose gravel on the surface would slow the leader relative to the chasing pack.

CNN: Latvala victory ends Loeb's winning streak