DISCONNECTOR (VERSIONS) Russian patent published in 2014 - IPC E21B17/06 E21B33/14 

FIELD: oil and gas industry.

SUBSTANCE: disconnector contains a case 1 of the hanger, a supporting pipe 2, a nut 5, a coupling bushing 11 and a thrust bushing 7. The case 1 has step-like inner and outer surfaces. At the outer surface the nut 5 has a left-handed thread to interact with the case 1 of the hanger and a spline at inner surface to interact with the supporting pipe 2. The coupling bushing 11 is installed from inside at the end of the supporting pipe 2 and equipped with a suspended plug 13 and shear bypass plug 14. The thrust bushing 7 designed to fix a collar bearing 8 is installed at the end of the supporting pipe 2, which end is step-like. Outer diameter of the middle step is equal to inner diameter of the nut 5. Outer diameter of the low step is equal to inner diameter of the case 1 of the hanger and outside diameter of the collar bearing 8. The low step of the supporting pipe 2 is designed to unload the collar bearing 8 by its butt end and connected to the case 1 of the hanger with potential turn in regard towards each other and disconnection. The disconnector contains additionally a bushing 4 to connect the supporting piping to the case 1 of the hanger and to prevent turnout of the nut 5 during drilling, moreover the bushing 4 is spring-loaded and made with elements 9 for interaction with the case 1 of the hanger at butt end in order to prevent interaction during rotation. Outer diameter of the bushing 4 is less than outside diameter of the case 1 of the hanger in order to ensure rotation during disconnection. For the purpose of interaction elements 9 are made as male and female joint.

EFFECT: ensuring torque transfer to the right side of the bore bit.

4 cl, 7 dwg