Sand plug always occurred during fracturing in slant well or directional well.
斜井或定向井在压裂过程中，经常因出现砂堵导致施工失败。
The construction, the upgrading and the elevator system of many pipelines installment on the slant well crown is elaborated.
论述了斜井顶部多趟管路安装施工、起重、升降机系统。
Brain is not used well, be about to ebb or go slant.
脑子不好好用，就要衰退或走偏。
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