The Kondrashevskoye oil field (formerly Korchegskaya prospect) is located in the north central part of License 61 between the Lineynoye and Tungolskoye oil fields. This structure was delineated and prepared for drilling by seismic data in 1990-91. Additional seismic data was obtained by PetroNeft in 2005/2006 and 2006/2007. The Korchegskaya No. 1 discovery well was drilled in 2008. The well tested an inflow of 125 bopd from Upper Jurassic J1 sandstones (2,469.35 to 2,473.35 m TVD SS). Core and petrophysical analysis indicates 3.25 m of net pay in this interval. The entire J1 sandstone was oil saturated in the well and further drilling was required to define the oil water contact for the field. The oil is high quality with a density of 0.790 g/cm3 (47⁰ API gravity). Following the Korchegskaya No. 1 discovery the structure was renamed the Kondrashevskoye oil field in honour of a pioneering West Siberian Geologist/Geophysicist, Vladimir Kondrashov.
In 2011 PetroNeft drilled the Krondrashevskaya No. 2 delineation well (vertical and sidetrack) on the northern lobe of the structure with the intent of further defining the oil water contact. The Kondrashevskoye No. 2 sidetrack was drilled down dip from the Kondrashevskoye No. 2 well and penetrated the oil water contact in the objective J1-1 sandstone interval at -2,465 m true vertical depth (“TVD”). The reservoir interval of 3 metres in the sidetrack section was slightly thicker than in the vertical well with the top metre of the reservoir was oil bearing. Production casing has been run and cemented in the sidetrack well so it can be used as an injector or water source well when the field is developed.
Based on the well results, Ryder Scott recalculated the SPE 2P reserves for the field at 4.98 million barrels. The exact timing of development of Kondrashevskoye will depend upon how the economics of this field development compares with other nearby fields, most notably Arbuzovskoye and Sibkrayevskoye.