In 2014, drilling reached more geologically complex sections of the deposit using horizontal drilling technologies and the drilling of multi-lateral wells.
Over the 12 months of the reporting year, 772 new production wells were commissioned from drilling at the Company’s subsidiaries, including 297 horizontal wells. In drilling areas with low reservoir properties, multi-stage hydraulic fracturing was conducted at 168 horizontal wells with the average flow rate from the horizontal wells totalling 43.4 tonnes per day. A total of 30 multi-lateral wells were drilled over the 12 months of 2014.
As of the end of 2014, the operating oil well stock at the Company’s subsidiaries had increased by 679 wells and reached a total of 8,139 wells.
The increase in the number of commissioned wells became possible due to the additional production drilling programme: the penetration rate reached 2,813.567 metres due to an increase in the drilling volume of horizontal wells.
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These results are to be achieved through the gradual commissioning of oil fields explored by Gazprom Neft, the opening of fields on the Yamal Peninsula as well an expansion in the resource base by commissioning oil fields on the balance sheets of other companies in the Group.
Most of the drilling is taking place at the Priobskoye, Vyngapurovskoye, Yety-Purovskoye, Kraynoye, Vyngayakhinskoye, Zimneye, South Shinginskoye, Archinskoye, East Orenburgskoye and Tsarichanskoye fields. In 2015 CJSC Messoyakhaneftegaz is planning to start pre-drilling of production wells as part of preparations for the commercial launch of the East Messoyakha field starting in the fourth quarter of 2016.
Measures to reduce the rate of production decline in order to achieve the targets:
- drilling of new wells;
- introduction of new technologies to simulate productive formations;
- work with the idle well stock;
- improvements to the flooding system at fields with a long history of development;
- taking steps to maintain reservoir pressure at new sites.