Locking ring

Purpose

The device is intended to reliably secure and prevent axial movement of the casing hardware on the casing body.

Field of application

The device is used in vertical, directional sidetracks or wellbores with a horizontal ending.

Technical description

The locking ring consists of:

Collets, a split sleeve with lobes that have the ability to deflect inward. There are teeth on the outer surface of lobes, which form a strong engagement with the teeth of the ring.

Rings, made of special hardened steel, with a conical surface on the inside, as well as teeth that form a strong meshing with collet teeth. Mounting of the device is organized on the drilling rig catwalk. The collet and the ring are installed on the casing pipe. The ring is put on the collet with a certain force until the teeth are fixed. Under the action of the ring tapered surface the collet lobes get compressed, thereby ensuring a secure hold.

The ring is fitted to the collet using a special hydraulic device (wrench), allowing the even fitting of the ring with the required and sufficient torque.

Advantages

• Simple design and installation.
• The shear force of this device is 1.2 times higher than recommended by international standard ISO 10427-2:2004.
• Secure hardware fixation to the casing body, ensuring that it reaches its design depth.