Liner hanger assembly with rotation possibility while run in and also after disconnection
while cementing. Disconnection (brake) is provided in two ways before cementing – hydraulically or mechanically.
Assembly is designed for high torque, heavy axial loads and allows to RIH BHA at any or very
hard conditions.
BHA consists of separate modules: packer, anchor and setting tool.
BHA has several locks from pretriggering:
• Packer assembly is actuated after release and pulling out the setting tool and by partially
unloading the weight of the drill string;
• Mechanically disconnection (brake) is made by a quarter turn of drill string counterclockwise;
Allows to perform the following operations:
• Run in the hole with drilling string rotating and rimming;
• Provide intermediate fluid (mud)circulation;
• Activation of the string starts after ball drop and pump it down to the shear saddle;
• Actuation of packer anchor are provided by pressure raise up to 140 atm and weight
relief on the tailpipes;
• The brake-up of tail from the drill string is provided by pressure raise up to 180atm;
• The check of disconnection is provided by picking up the string and pressure drop;
• Run in back the string and pressure test;
• Restore the circulation by raising the pressure up to 220 atm for shearing the seat with
the ball;
• Rotation of the liner while cementing;
• Cementing while run in the cement plug for dividing cement solution and squeeze mud;
• Attaching of cement plug to hollow hanger-plug installed in the string assembly;
• Receiving the Bump showing the squeezing cement is complete;
• Circulate to wash excess cement from the head of liner;
• Bring up to action the packer assembly and hanger with partially putting weight and
unloading the string on thrust sleeve. The string meanwhile can be rotating.