Because the yoke buckle oil casing is shaped like a ladder, it is called a stepped oil casing pipe
, which is one of the commonly used buckle shapes for oil casings.
The ladder ladder oil casing is abbreviated as btc ladder ladder oil casing. It is mainly used for supporting the well wall during and after drilling to ensure the drilling process and the normal operation of the entire well after completion. The casing of the casing offset buckle oil casing is bundled with steel wire or steel belt.
According to different well conditions and different depths of geological conditions, different grades of ladder-type oil casings are selected. The casing itself is also required to have corrosion resistance in a corrosive environment. The formula for calculating the weight is: [(outer diameter - wall thickness) * wall thickness] * 0.02466 = kg / m (weight per meter), the main materials include J55, K55, N80, L80, C90, T95, P110, Q125, V150. The advantages of the trapezoidal thread profile increase the resistance to axial and axial compression loads and provide leakage resistance.