FO Collar Stop (Product Code 110)

The Rebco FO Collar Stop is a depth stop device designed to locate and lock within the collar recess of API Upset and Non-Upset tubing, providing a firm platform at a predetermined depth upon which BHP instruments or instrument carriers can be placed and held during a pressure or temperature survey. The FO is lowered to the desired depth on the wireline tool string; an upward lift trips the internal collet springs, allowing the collet to expand outward into the collar recess. A downward jar on the fishing neck then drives the body downward to lock the expanded collet firmly in place, simultaneously releasing the running tool and leaving the stop set in the collar.

A defining feature of the Rebco FO Collar Stop is its weld-free, one-piece, machined collet construction. The collet is machined from a single piece of stock rather than assembled from separate parts. This eliminates the risk of weld failure under the stresses of setting, instrument loading, and retrieval, making the FO among the most structurally reliable collar stop designs available.

Available in nominal sizes 1¼" through 4½". See Section II (Service Tools, Pages II-27–28) for full sizing and selection data.

How to Order: See Section II, Service Tools, Pages II-27–28 for selection by nominal size and tubing type.

SS Tubing Slip Stop (Product Code 164)

The Rebco SS Tubing Slip Stop is a depth stop that grips the tubing bore wall directly rather than relying on a collar recess, making it usable anywhere along the tubing string, not just at collar locations. The SS is lowered to the desired depth, then a rapid downward movement expands the serrated slips outward against the tubing wall. Continued downward jarring drives the slips harder against the wall and simultaneously releases the running tool, leaving the SS anchored at the set depth. Its instrument carrier or BHP hanger is then landed on top for the survey.

Because the SS sets within the body of the tubing rather than in a collar, it offers far greater flexibility in depth selection than the FO. The operator can set the SS at any chosen depth rather than being constrained to collar locations. Available in nominal sizes 1¼" through 4½". See Section II (Service Tools, Pages II-29–30) for selection.

How to Order: See Section II, Service Tools, Pages II-29–30 for selection by nominal size and tubing type.

DO Collar Lock (Product Code 33)

The Rebco DO Collar Lock is a third-depth stop variant that, like the FO, sets within the tubing collar recess, but uses a different locking mechanism suited to a specific set of nominal sizes and applications. The DO anchors in the collar and provides a platform for instruments or other tools. Available in nominal sizes 2" through 3". Running and retrieving tools are available; contact us at info@rebcooiltools.com for details.