Sakhalin Energy has started injecting water into its first extended reach well from the Molikpaq platform. The well will enable an increase in reservoir pressure, which will increase oil recovery and maintain production levels in the longer term.
Sakhalin Energy General Assets Manager Leo Lievaart said, "Re-pressurisation of the Astokhskoye field is a key priority in ensuring the continued efficient recovery of oil from the Vityaz complex."
The start of water injection into the extended reach well, which has a total depth of 5,894 m, follows the completion of drilling on July 29 and the subsequent hook-up of water injection facilities. The well will allow 30,000 b/d of water to be injected into the reservoir.
The new extended reach well required the use of oil based drilling mud for the first time on Molikpaq due to the length and technical nature of the well. Sakhalin Energy operates a zero-discharge policy on oil-based mud into the marine environment. All cuttings are re-injected into a dedicated cuttings re-injection well, preventing any negative environmental impact.
Although this well is Sakhalin Energy's first extended reach well using oil-based mud, it is the second water injection well to be drilled from the Molikpaq platform. The first water injection well was completed on March 12. Since being brought into operation, water injection rates into the reservoir through this first well have been increased to the present stable rate of 30,000 b/d. A total of 2.7 MMbbl of water has been injected through this well to-date.