Sakhalin oil fields

Principal reserves of high viscosity oil in Sakhalin are found at the fields of Okha, Katangli, Uiglekuty, Vostochnoe Ekhabi and Zapadnoe Sabo. 

The production from these fields by primary methods, also by secondary methods other than thermal, was not very effective. For the majority of these fields, the total recovery factor, even after 40 years of production, did not exceed 20%. 

In 1968, the steam flooding was started first at the Okha field and then at the Katangli and Vostochnoe Ekhabi fields. 

In subsequent years this combined steam-water flooding was greatly extended. By the end of 1975, part of the Okha field that originally accounted for 26.4% of Okha field s total reserves of oil in place was producing by this technique (Table 22). 

Very go results were obtained in the Sakhalin oil fields by application of this technique. In the course of 8 years it resulted both in an increase and stabilization of oil production. In 1979, 25% of the total oil obtained that year firom the Sakhalin oil fields was produced by this EOR technique. 

---