or enhanced burst strength pipe.
Third Generation The BK-HT was designed for Frac Strings unlike first generation designs which were primarily for drilling with casing in shallow vertical wells. BK-HT, BK-FX and BK are interchangeable.
Buttress Compatible BTC compatible for cost savings on hangars, float shoes, float collars, crossovers and custom tools.
Self Centering Anti Rotation Feature A Patented Anti Rotation feature prevents the coupling from turning past center during make up with a thread interlock. It acts as a torque shoulder and prevents splitting a coupling by over- torqueing the connection.
Better Buttress Sealing Uses a modified buttress thread for tighter thread sealing and pin nose seal stabilization. The larger Coupling OD can take higher frac pressures and supports thicker wall pipe with 100% matched pipe strength. It also provides more strength when utilizing high collapse or enhanced burst strength pipe.
Strength Pin nose to pin nose contacts allows for higher bending loads and structural compressive loads while maintaining sealing. A low hoop stress design reduces the chance of coupling splits and leaks from high frac pressures. The smooth premium pin nose bore is tapered with edge breaks to prevent hang ups. More reliable than API BTC or API BTC with torque rings.
Reliable Materials Unlike first generation drilling with casing connections, the BK-HT addresses the problems that have caused couplings to fail. Low hoop stress and controlled hardness couplings are utilized to reduce the chance of stress induced corrosion and embrittlement. Better impact strength increases resistance to cold water fracs, mild sour environments and saltwater/brinewater.