РаLiner Hanger with two kinds of release before cementing is performed before cementing
operation in two modes: hydraulically and mechanically.
Liner hanger consists of following individual hubs: packer, anchor and setting tool.
Assembly has a row of locks from premature response:
• Packer is actuated after release and pulling out of setting tool by partial putting on weight
of the string;
• Mechanic release is provided by rotating the string clockwise.
This assembly allows provide the following operations:
• Run in the hole w/liner;
• Provide intermediate well circulation;
• Activation of assembly starts after drop and circulation of drop-ball down to the sitting
saddle ;
• Actuating the anchor by pressure up to 140 atm and putting weight on the liner;
• Provide release the liner from the drill string by pressure up to 180 atm or by turning the
string cloclwise;
• Disconnection is checked out by picking up the string to ensure pressure drop;
• Run in back in the hole and pressure test;
• Restore the circulation by raising the pressure up to 220 atm to shear the seat with the ball;
• Cementing through top plug to separate cement and squeezing fluids;
• Attaching of cement plug to hollow hanger-plug installed in the string assembly;
• Attaching of top cement plug to hollow hanger-plug installed in the string assembly;
• displacing the cement slurry to the outer annular space of the liner and receiving of “Bump”
signal;
• Circulate to wash excess cement solution from the top of liner;
• Actuation of liner packer assembly and hanger with partially putting weight and unloading
the string on thrust sleeve.