Oil and Gas Production Efficiency Improvement
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Oil and Gas Production Efficiency Programs and Power Saving Technologies. Application of Advanced Equipment and New Technologies.
Operation of the well stock and oil-field equipment is controlled by telemetering systems (7316 units). Measurements, technological parameters control and management of the facilities' performance are performed by the «intellectual» software technical complexes, which automatically generate decisions on the equipment operation. Information on current facility condition is transmitted via a radio channel and the corporate network on the basis of fiber-optic communication lines.
The control system provides for reliable metering of produced oil and gas on the basis of modern measuring means and systems according to the legislative requirements. The wells products metering ratio is 99.7%. Integrated registration of production from 5 fields with depletion over 80% and from 2 extra viscous oil fields was arranged with the account of the tax benefits granted under subsoil tax.
A unique information system «ARMITS» is applied for automation of the oil production management and for provision of operative control of the field development. Formation of geological reporting is provided with the help of the corporate information system «Tatneft-Neftedobycha». Cost planning, recordkeeping of geological and technical activities and monitoring of investment portfolio are implemented on the basis of this system. The solution of specialized tasks is carried out using the specific applied software packages. The total number of users makes about 5,000 professionals.
The real time measurement of temperature along the wellbore with application of the fibre-optic system with distributed temperature sensors is a reliable tool for monitoring operation of the pilot wells. Information of the well temperature logging is used for creation of the permanently operating extra-viscous oil field model.
Fields Prospecting
In addition to standard technologies (i.e. seismic survey), the Company applies some new ones for oil fields prospecting:
- prediction of oil-bearing intervals with application of the «Neiroseism»artificial intelligence method;
- collection of hydrocarbon gases escaping from the soil and assessment of hydrocarbon diffusion halation with application of Gore Sorber module;
- low-frequency seismic sounding (LSS);
- geological and geophysical technology for optimization of the selecting well drilling site locations;
- electromagnetic sounding (EMS);
- software package for processing 3D «Stratimegic»seismic survey results.
Drilling
24 new technologies were applied in drilling in 2008, or 931 well/technologies at 281 wells. Out of 278 drilled wells over 91% (254 wells) were drilled with application of new technologies. The most effective technologies in terms of the wells casing quality are the silicate tanks in the productive formations intervals; use of G-grade cement; application of the collar cementing units; and in for achievement of high oil production rates - construction of horizontal wells and downhole splitters.
In 2008 OAO TATNEFT drilled 26 slim hole wells (SHW) and 21of those wells were commissioned for oil production (oil production volume amounted to 26.1 thousand tons). The average production rate amounted to 7.9 tons per day.
Production
Use of enhanced oil recovery methods is a determinative factor in oil production.
Incremental oil production owing to the tertiary advanced recovery methods application amounted to 5,173.2 thousand tons in 2008 (100.8% versus the level of 2007). In aggregate the production resulting from application of the enhanced oil recovery methods accounted for 45.2% of the total production volume.
Operations at the Extra-Viscous Oil Fields
Pilot operations on development of extra-viscous oil fields were continued in 2008. Commercial production is on the way from two extra-viscous oil deposits of the Sheshminskiy horizon at Mordovo-Karmalskoye field and from Ashalchinskoye field. The projects of test operation of 19 deposits and fields were prepared.
Site arrangements for application of thermal oil production methods were performed at the deposits of Mordovo-Karmalskoye field (the process flowsheet of pilot operations was approved by the Central Development Commission (CDC). The test site for the in-situ combustion technology using horizontal wells was allotted at the Southern and South-Western areas; while the test site for application of steam treatment was allotted at the Northern Cupola. The production of extra viscous-oil deposit at Mordovo-Karmalskoye field amounted to 5.0 thousand tons of oil in 2008.
The production of extra-viscous oil at the site of pilot operations of Ashalchinskoye field exceeded 12.7 thousand tons with the first pair of wells accounting for production of 5.5 thousand tons and 6.8 thousand tons were produced from the second pair of wells. The third pair of wells was drilled by now and this pair is at the stage of completion. The volume of extra-viscous oil produced from the beginning of the pilot operations exceeded 25 thousand tons. The current oil production at the experimental site amounts to 51-52 tons per day. Drilling of the fourth pair of the wells is on the way at present with application of the slanted mast drilling rig. All future operations for drilling horizontal wells to the extra-viscous oil deposits will be performed with application of similar equipment.
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