Crude Oil Production
OAO TATNEFT produced 2,128,087 tons of crude oil in April, while the production volume for four months amounted to 8,581,700 tons accounting for 56,819 tons increase versus 2011 (100.7%) with the above-the-plan production amounting to 187,498 tons (102.2%). The amount of 8,455,955 tons of crude oil was delivered with the above-the-plan delivery coming to 266,545 tons.
The production of TATNEFT Group of companies amounted to 8, 675,774 tons of crude oil with the-above-the-plan production amounting to 187,603 tons (102.2%).
The total new drilling penetration for 4 months of 2012 amounted to 215.9 thousand meters (174.1 thousand meters in 2011), including 159.2 thousand meters (141.2 thousand meters in 2011) drilled for OAO TATNEFT with production drilling amounting to 156.9 thousand meters and exploration drilling amounting to 2.3 thousand meters. 17.3 thousand meters (14.3 thousand meters in 2011) were drilled for subsidiaries of OAO TATNEFT, including production drilling in the amount of 14.1 thousand meters and exploration drilling in the amount of 3.2 thousand meters.
113 wells (120 wells in 2011) were constructed and delivered to the customers, including 76 wells (86 wells in 2011) for OAO TATNEFT, including 74 wells of production drilling and 2 wells of exploration drilling. 8 wells (10 wells in 2011) were delivered to the subsidiaries of OAO TATNEFT, including 7 wells of production drilling and 1 well of exploration drilling.
Active Well Stock Drilling
The total penetration of sidetracking and horizontal wellbores during four months of 2012 amounted to 12.3 thousand meters (13.2 thousand meters in 2011), including 6.4 thousand meters (9 thousand meters in 2011) drilled for OAO TATNEFT.
24 wells (29 wells in 2011) were delivered to the customers, including 16 wells (22 wells in 2011) delivered to OAO TATNEFT.
40 drilling crews have been performing traditional well drilling operations since the beginning of 2012. 7 drilling crews are engaged in drilling lateral wellbores and lateral horizontal wellbores. One drilling crew performs drilling to the bituminous deposits of Ashalchinskoye field for NGDU "Nurlatneft".
For four months of 2012 the penetration per crew in new drilling amounted to 5466.7 м meters, while in 2011 the penetration per crew amounted to 5,043 meters. 29.1 thousand meters were drilled outside the Republic of Tatarstan.
Repair of Wells
631 well remedial operations were performed in April 2012 with a number of the wells subjected to remedial operations for four months amounting 2751 which is 10% more than in 2011 ( 2,501 wells during four months in 2011).
The number of production wells was 2,264 accounting for 9.7 percent increase versus 2011 году (2063 wells in 2011) and the number of injection wells was 374 - 14 percent increase versus 2011 году (328 wells in 2011).
17 wells were repaired outside the Republic of Tatarstan, including 16 wells for OOO "Tatneft-Samara", 1 well for OAO "Ilekneft (15 wells were repaired during 4 months of 2011, including 13 wells for OOO "Tatneft-Samara" and 2 wells for OOO "Tatneft-Severny").
The workover operations were performed in 756 wells during four months of 2012 (190 wells in April), including production string sealing performed in 112 wells, shutting-off individual layers and recompletion in other intervals were performed in 56 wells, transfer of wells into different categories and wells completion for injection in 49 wells, liquidation of downhole complications and cleaning of production casing and bottomhole in 83 wells, installation of isolating packers and dual completion systems in 21 wells, physical liquidation in 11 wells. 236 wells were worked over with application of coil tubing (52 wells in April), including 42 wells worked over through the annulus.
Formation hydrofracking operations were performed in 127 wells (31 wells in April), accounting for 34 wells increase versus the similar period in 2011 (93 wells during 4 months of 2011). The cumulative incremental crude oil production resulting from application of this method amounted to 5 million 497 thousand tons.
Twelve small diameter wells were drilled and completed for OAO TATNEFT by the workover crews during four months of 2012. At present drilling of one slim hole is in progress for NGDU "Nurlatneft", NGDU "Jalilneft" and NGDU "Prikamneft".
Works on oil recovery enhancement were performed in 692 wells (126 wells in April) including chemical methods applied in 384 wells (l72 wells in April).
The incremental crude oil production resulting from application of crude oil recovery enhancement methods amounted to 1 million 886 thousand tons with application of chemical methods accounting for production of 858 thousand tons.
Bottomhole area treatment operations with application of OAO TATNEFT's technologies were performed in 1,030 wells during four months of 2012.