tis is a general question with no specific well detail. It could be deemed as following up a similar discussion in 2014 but I'm hoping for additional innovation in the past 5 years..
The wells have been inadequately abandoned and need to be re-entered and re-cemented. However they have been severed at 10ft below seabed with either the conductor only or the conductor & surface casing severed in one cut which probably makes for a more difficult re-entry. We'll have to come on with pressure control equipment to allow for drilling out of cement plugs and potential exposure to wellbore pressure, and fatigue resistance may become a consideration as well
Has anyone actually done this or similar operations or know of a service company which has designed a system to do it? Much obliged
Hi guys - thanx for the responses.
For some wells including CCS, the previous abandonment is not sufficient to prevent leakage; indeed abandonments are being conducted all over the world at present which are not suitable for preventing leakage of hydrocarbons or CO2.
Therefore some operators are indeed looking at ways of re-entering, with the proviso that pressure control and structural integrity is required.
I contacted Claxton and they have certainly done similar work but more related to the structural aspects - dredging and a large overshot to get on to the conductor.
I could see that getting on to the inner strings are indeed more straightforward on the land wells as you discuss Steve, but getting on to the subsea inner strings is more problematic. This is the technology which doesn't appear to be there as yet.
This post did however get a response to show that designs are in place for variations of internal and external packers with anchoring slips dependant on aspects like strings cemented to surface or not, or what thru-bore is required to work deeper down.
Whichever size and type of BOP connector could be incorporated. The company which has designed this equpment may wish to elaborate on this thread if others are interested.
That Tayor Oil spill is a bit scary.