... CCL（casing collar locator） 套管接箍测井 casing grade套管钢级 casing gun 电缆输送套管射孔枪 ...
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N80Q grade casing N80Q钢级套管
double-grade casing 双级箍
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The outer portions of the float shoe are made of steel and generally match the casing size and threads, although not necessarily the casing grade.
浮鞋的外壁由钢制成，且一般与套管的尺寸和丝扣匹配，然而浮鞋的钢级不一定要与套管钢级一致。
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