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bottom wall and anchor packer
oil
井壁及尾管圭寸隔器
;
井底固定圭寸隔器
;
卡瓦锚管联用封隔器
;
卡瓦支撑联合封隔器
tech.
孔壁及尾管封隔器
;
井壁及尾管封隔器
;
复合式井底封隔器
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