There are a number of different things that can make tie-backs difficult to enter PBR's not just the design and shape of the device on the end of the tie-back.
If this is a current operational problem contact me on [email protected]
if not for the analysis of a past or future job consider the following:
1. Is the PBR from the same manufacturer as the tie-back device or just supposed to be compatible?
2. Has the PBR been cleaned and dressed off by a proper set of mills from the PBR supplier?
3. Is the top of the PBR likely to be centralised or decentralised and will the profile on the tie-back ride up into or stand up on depending on the orientation? A simple yard or deck check of the two parts coming together may demonstrate this
4. If you can move up and down and rotate and circulate you can probably work it in if they are compatible.
5. If you have limitations on what movement and circulation you can do consider sourcing a self orientating or rotating mule shoe or if a different style of guide is merited perhaps zero mule, 1/4 mule, 1/2 mule, etc.
6. There are also some shearing indicator guides that help entry and confirm correct entry because they only shear when full entry had occurred.
7. These days there are lots of options and in some circumstances a half mule shoe guide run straight down is simple not enough!!
Good luck in current or future jobs.