RE: Dual Completion Next24 Jun 2020 07:46
Following the identification of the water ingress source via production logging, a rigid setting Thermatek® plug was set over a zone of open natural fractures clustered at the deepest part or "toe" of the wellbore. Initial testing of HH-2z post-Thermatek® has demonstrated a continuous flow of dry oil to surface, confirming that the plug has eliminated underlying formation water ingress into HH-2z.
Dry oil flow rates during the initial 48-hour "clean-up" period to date are encouraging, with metered daily rates averaging 223 barrels of oil per day ("bopd"). However, as is to be expected in the early clean-up stage of such a horizontal wellbore, both oil and associated gas rates have been very variable. Half hourly rates have thus ranged from a high of 778 bopd to a low of around 10 bopd during intermittent short periods of "slugging" (i.e. the return of discrete pockets of gas and/or completion fluids).
The water ingress problem meant that HH-2z remained shut-in for almost 3 months, with spent drilling and completion fluids within the near wellbore. Consequently, it is expected that the full clean-up process is likely to take a number of weeks of aggregate flow. As part of the clean-up process, to ensure the full remaining horizontal section contributes towards aggregate oil flow, further interventions are planned to help fine-tune and optimise flow from the well.