Experience of development of the Yurkharovskoye oil/gas/condensate field with the use of horizontal wells
The paper reflects the experience of development of the Yurkharovskoye oil/gas/condensate field located at the area of the Nadym and the Taz Regions of the Yamal-Nenets Autonomous Area. The commercial development of the field was commissioned in January 2003. The field is unique in terms of extractable gas reserves. In the tectonic relation the field is controlled by the Yurkharovsky structural cape being one of the links of the Medvezhye-Yamburg mega-bank belt (northern part of the Nadym-Taz syneclise). The area of the Yurkharovskoye oil/gas/condensate field is about 260 sq.km. Productive deposits are mostly referred to the stratal-roof type and are located close to each other within a minor area. Hydrocarbon deposits are united into 7 operational units. The Valanzhinsky deposits (development units IV-VI), where 75 % of reserves of the Yurkharovskoye oil/gas/condensate field are concentrated, are the main production units. The authors describe a spectrum of tasks aimed at improvement of the efficiency of reserves development and extraction at the Yurkharovskoye oil/gas/condensate field. For these purposes, they give the results of benchmarking study of averaged parameters and data of gas-dynamic studies of horizontal and inclined wells by the example of reservoir BU <sub>1-2</sub> being one of the first ones commissioned for development (being developed for more than 10 years already; 44 % extracted to date) and representing a gas-condensate deposit of stratal-roof type with effective gas-saturated thicknesses 3 to 94 m, porosity 0,18-0,21, permeability 30-330 mD and gas saturation 0,7. The completed analysis showed that horizontal wells allow to receive higher cumulative gas extraction and ensure higher productivity (by 2-3 times) than inclined ones with smaller stratal energy losses.