With rational unit length and hinge rotating Angle, the flexiblecasing can be adaptable to the buckling borehole.
在合适的单元长度和铰链转角下，柔性套管可以较好地适应弯曲的井眼。
2
Waterproof coiled materials of SBS are a flexible felt of polyester fibre as casing, SBS modified asphalt as coating and polyethylene film as antiseizing separation layer.