Use of an activate-able scraper in a drilling or cleanout BHADear all,
Here's another item that keeps cropping up.
A well re-entry is being planned. The well has was temporarily-suspended with a cement plug inside 11¾" liner and the shoetrack had not been drilled out.
The re-entry plan requires a USIT/CBL to be conducted to investigate the bond outside the liner.
Due to drilling out a cement plug, and - possibly part of the shoetrack - the wireline company has requested that we scrape the casing. The team are looking at various options, which include:
- Incorporate a 'drilling scraper' in the BHA (ODfjell's DrillRdillo comes to mind): these are run in the 'collapsed' state and after drilling is finished, they are activated (ball) and then the casing can be scraped.
- Incorporate a 'non-rotating' scraper in the BHA (MI-Swaco's Razorback comes to mind), and anticpating that the drilling bit/mill will grind the cement up small enough so as not to cause a problem
- Don't bother running a scraper at all (after all scrapers are hardly ever run before bond logs)
Note added later: The reason that we need to know about the cement bond is because the contingency plan (if we cannot re-use the old hole below the liner) is to conduct a cased-hole sidetrack.