The heavy-duty hydraulic disconnect (HDHD) allows the tool string to detach at a predetermined point via the deployment of a suitable drop/trip ball through the coiled tubing. The drop ball locates on a piston sleeve, creating sufficient backpressure to shear the pins and disconnect the tool. When this happens, the piston sleeve pushes the tool apart to ensure a clean disconnect, and circulation is immediately returned to the tool string, providing a surface indication of a positive disconnect. All piston sleeves and drop balls are returned to the surface, leaving a standard GS internal fish neck for retrieval purposes.
The HDHD uses a heavy-duty, one-piece, threaded collet slip to disconnect. The collet slip endures higher tensile loading than collet finger-type release mechanisms and is far less susceptible to fatigue. The collet slip is backed up with a collet slip sleeve to give the maximum tensile strength possible to the disconnect during heavy jarring operations.
Only by dropping a ball and shearing the pins can the collet sleeve shift, allowing the collet and top sub to part. The piston sleeve is pressure balanced so internal pressure does not affect the hydraulic configuration and shear values.
High torque capabilities are achieved through positive-torque drive teeth between the top sub and the main body of the tool. The HDHD is therefore ideally suited for high-torque, heavy-duty coiled tubing drilling operations in which maximum performance and durability are essential. Shear screws can be supplied in either brass or steel to give a comprehensive pressure range suitable for any coiled tubing application. Shear screws are also integrally situated to eliminate the possibility of vibrating free during coiled tubing drilling operations.
When ordering HDHDs, please specify size and thread connection.
Note: The HDHD is also available as an overpressure release-type release joint.
- Retrieved with a standard GS running tool