OREANDA-NEWS. December 12, 2011.
Crude Oil Production
TATNEFT produced the amount of 23,726,389 tons of crude oil during eleven months of 2011 which made 45,243 tons more than in 2010 (100.2%) with the above-the-plan production amounting to 483,188 tons (102.1%), reported the press-centre of TATNEFT.

The total crude oil production in the Republic of Tatarstan during the same period amounted to 29,782,259 tons of crude oil or 100.2% versus the same period of the previous year (+ 57,966 tons).

Oil producing enterprises of TATNEFT recovered 23,967,893 tons of crude oil with the above-the-plan production amounting to 492,578 tons (102.1%).

Drilling
Traditional Drilling
The penetration of new drilling for eleven months of 2011 amounted to 565.7 thousand meters (572.4 thousand meters in 2010). 445.1 thousand meters were drilled for TATNEFT (450.9 thousand meters in 2010), including 431.9 thousand meters of production drilling and 13.2 thousand meters of exploratory drilling. 39 thousand meters (23.2 thousand meters in 2010) were drilled for subsidiaries of TATNEFT, including 34.6 thousand meters of production drilling and 4.4 thousand meters of exploratory drilling.

Totally 372 wells (391 wells in 2010) were constructed and delivered to the customers, including 278 wells (287 wells in 2010) for TATNEFT with a number of production wells amounting to 277 and 1 exploratory well. 29 wells (11 wells in 2010) including 26 production wells and 3 exploratory wells were constructed and delivered to the subsidiaries of TATNEFT.

Active Well Stock Drilling
The total penetration of sidetracking and horizontal wellbores drilling for eleven months of 2011 amounted to 40.4 thousand meters (29.3 thousand meters in 2010), including 19.7 thousand meters (17.3 thousand meters in 2010) for TATNEFT.

90 wells (81 wells in 2010) were delivered to the customers with 54 wells (52 wells in 2010) delivered to TATNEFT.

36 drilling crews performed traditional well drilling operations in 2011. 10 drilling crews were engaged in drilling lateral wellbores and lateral horizontal wellbores. The penetration per one crew amounted to 15,823 meters in 2011, while in 2010 the penetration per crew amounted to 15,796 meters.

58.7 thousand meters were drilled outside the Republic of Tatarstan. 53.4 thousand meters were penetrated in horizontal wellbores and bottomhole splitters.

Wells Repair
728 well remedial operations were performed in November 2011 with the number of the well remedial operations performed during eleven months amounting to 7,606 wells, i.e. 9.3 percent less than in 2010 (8,384 wells during 11 months in 2010). The number of remedial operations performed at the production wells reduced by 9.2 percent (from 6,900 down to 6,266), and the number of injection wells repairs reduced by 4.2 percent (from 991 down to 949).

47 wells were repaired outside the Republic of Tatarstan with 37 wells for "Tatneft-Samara", 3 wells for "Tatneft-Severny", 2 wells for "Ilekneft" and 5 wells for "KalmTatneft" (44 wells were repaired at "Tatneft-Samara" during 11 months of 2010).

The workover operations were performed in 2,483 wells during 11 months of 2011 (258 wells in November), including production string sealing performed in 366 wells. Shutting-off individual layers and recompletion in other intervals were performed in 260 wells; transfer of wells into different categories and wells completion for injection were performed in 122 wells; failure liquidation and cleaning of the production string and bottom hole zone were carried out in 250 wells and physical liquidation and re-liquidation were performed in 40 wells.

797 wells were worked over with application of coil tubing (97 wells in November), including 135 wells worked over through the annulus.

Formation hydrofracking operations were performed in 301 wells (31 wells in November), that is 37 percent more than for the similar period of 2010 (220 wells during 11 months of 2010). The incremental cumulative crude oil production through application of this method amounted to 5 million 392 thousand tons.

40 small diameter holes were drilled and completed for TATNEFT during eleven months of 2011. At present drilling of one slim hole is in progress for NGDU "Almetyevneft" and one slim hole for NGDU "Elkhovneft".

Works on oil recovery enhancement were performed in 2,209 wells (189 wells in November) with chemical treatment methods applied in 1,253 wells (110 wells in November).

The incremental oil production volume resulting from application of the enhanced oil recovery methods amounted to 5 million 055 thousand tons of crude oil with the chemical methods accounting for the production of 2 million 380 thousand tons.

Bottomhole area treatment operations with application of TATNEFT's technologies were performed in 3,059 wells during eleven months of 2011.