RE: previous side-track fails?23 Jul 2022 12:10
I read in the accounts of Wingas that the last well drilled â SF07 encountered a lot of difficulties and had to be shut in. What makes you confident that you can make more of a success of your proposed sidetrack through SF05 scheduled for 2021? (This question formed part of larger question already published but the full historical data has taken a few days to assemble) Asked on 5 August 2020
The Saltfleetby 7 sidetrack was drilled from the B site towards the West, as can be seen in Figure 5 in the CPR (Structural Map of the Top of Westphalian Reservoir (Unit 2b)). The well was first perforated in the Brinsley Abdy formation, but failed to flow oil. Thereafter there was significant differential sticking in the Westphalian unit and the well was sidetracked to penetrate the Namurian C which was thinner than prognosed due to faulting, and so another sidetrack (SF07Y) was drilled into a thicker Namurian C sand. After completion and perforation in 2003 the well flowed 2.4 mmscf/d of gas on test. However, once the well was linked up to production equipment it became clear the reservoir had suffered some form of permeability impairment and the well gas rate was restricted.
With respect to the upcoming SF05 sidetrack, this is to be addressed from the B site in completely the opposite direction towards the East, tapping a prolific part of the reservoir. The well is to be drilled using techniques that will negate the impact of any differential sticking, and also in to an area where there is good well control (SF3z and SF5). Therefore we have good reason to be confident that we can avoid any of the issues seen in SF07.