The Rebco JU Jay Unlatching Running Tool is a specialized accessory running tool used exclusively to deploy pressure and temperature recording instruments into the wellbore and land them on top of a pre-set depth stop, such as a Collar Stop or Slip Stop, without the need for a conventional latch-and-set sequence. Rather than using dogs or collets to mechanically set a subsurface device, the JU operates on the principle of a J-slot mechanism: a J Head, which is ordered separately and attached directly to the recording instrument (or to an instrument carrier such as a Bomb Well), engages into the JU's internal J-slot profile. Once the instrument assembly lands on the pre-set stop and the weight of the tool string acts downward, the J-slot geometry automatically unlatches the J Head, leaving the instrument and J Head assembly in place downhole while the JU Running Tool is retrieved to surface with the rest of the wireline tool string.

This latch-and-leave mechanism is what makes the JU indispensable for BHP survey operations: the recording instrument is set gently onto its stop with no jarring, no shearing, and no risk of disturbing the measurement. At a later date, when the survey is complete, the J Head's external fishing neck is engaged with an appropriate Pulling Tool (Section IV, Product Code 40), and the instrument assembly is retrieved to the surface.

Available in nominal tool string sizes 1½" through 4½", with J Heads ordered separately. J Heads are available with either ¾–16 or 15/16–10 Box Thread connections.

How to Order: Available in assembly numbers from 4107161500 (1½") to 4107163000 (4–4½"). J Heads ordered separately, specify fishing neck OD and Box Thread connection (¾–16 or 15/16–10) when ordering. See Section VI (BHP Instrument Hangers & Accessories) for J Head and JO Unlatching Tool assembly details