The gravel packing in casing is a effective method to prevent sand production.

套管内砾石充填防砂是一种行之有效的防砂方法。

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Method Z2 - intermediate casing end face with top view door.

Z 2制法——中间机壳端面带有上端检视门。

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Method Z2 - intermediate casing end face with top view door.

Z 2制法——中间机壳端面带有上端检视门。

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