The Lock Mandrel is a downhole device, run and retrieved on slickline in which it is placed and anchored to the Landing Nipple within the tubing string to provide a setting point for flow-control equipment such as valves, chokes and plugs.
The two main types of Lock Mandrel uses different mean of locating and anchoring; a Selective Lock locates and anchors any matching Landing Nipple profile within the tubing; and a No-Go non-selective Nipple Lock, usually installed at the bottom of the tubing string. The No-Go Nipple Lock can also be used in taper string application.
Applications
- Plugging under pressure.
- Provides pre-determined locations for setting and locking subsurface flow controls.
Features
- Single nipple installation or as the bottom nipple in a series of ‘KXO’ or ‘KRO’ Landing Nipple.
- Standard weight tubing in a series of ‘KX’ and ‘KXN’ (bottom) Landing Nipple. (The ‘N’ designates no-go nipple)
- Heavyweight tubing in a series of ‘KR’ and ‘KRN’ (bottom) Landing Nipple. (The ‘N’ designates no-go nipple)
- Retractable Locking Key.
- Locks designed to hold pressure from above or below or from sudden reversals.
- Extra large ID for higher flow volumes.
- Landing Nipples have the same packing bore ID for a particular tubing size and weight.
Benefits
- Faster slickline service because of the retractable keys.
- Operator control of locating, landing and locking in the selected nipple.
- Inside fishing neck provide large ID to maximize production.
- Optional holddown feature for high flow rates and safety valve installation
- Holddown reduce the risk of the Lock Mandrel self-release due to high flow through the internal diameter
Optional Holddown
- Interference holddown for smaller Locks
- Shear Pin holddown for larger Locks
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