Preliminary results of comprehensive study on development of hard-to-recover oil reserves in Jurassic reservoirs

Authors: M.A. Romanchev, D.G. Chernyh, A.I. Kirillov, I.A. Zelenov, A.A. Nakraynikov (Varyoganneftegaz OJSC, RF, Raduzniy)
E-mail: aikirillov@rosneft.ru
Key words: ield, hard-to-recover reserves, horizontal wells, coring, extended logging suite, multi stage hydraulic fracturing.

A comprehensive approach was proposed to improve the efficiency of development
of complex and large field with low permeability reservoir. The approach included testing of the development technology of multi stage hydraulic fracturing in horizontal wells and well operation with step-by-step implementation of additional study  program. The project was launched in November 2012 when two first directional wells were spudded. These wells were used for studies: core was taken, extended logging suite was carried out, production logging program was completed and formation fluid samples were taken. First project stage resulted in almost complete removal of subsurface uncertainties concerning well placing which led to change of well direction. Also the height and the direction of fracture were determined with the help of tools and fracture propagation in horizontal wellbore was estimated. Such approach when a wide set of challenges at initial stage is met allows us to be sure that chosen engineering solutions are suitable. 

References
1. “Gazprom neft'” namerena k 2015 g. razrabatyvat' 60 mln. t trudnoizvlekaemykh zapasov (Gazprom Neft intends to develop 60 million tons of hard to recover reserves in 2015), AEI Praym, 2013, URL: http://mfd.ru/news/view/?id=1820869.
2. Kryanev D.Yu., Zhdanov S.A., Burenie i neft', 2012, no. 8, pp. 29-32.
E-mail: aikirillov@rosneft.ru
Key words: ield, hard-to-recover reserves, horizontal wells, coring, extended logging suite, multi stage hydraulic fracturing.

A comprehensive approach was proposed to improve the efficiency of development
of complex and large field with low permeability reservoir. The approach included testing of the development technology of multi stage hydraulic fracturing in horizontal wells and well operation with step-by-step implementation of additional study  program. The project was launched in November 2012 when two first directional wells were spudded. These wells were used for studies: core was taken, extended logging suite was carried out, production logging program was completed and formation fluid samples were taken. First project stage resulted in almost complete removal of subsurface uncertainties concerning well placing which led to change of well direction. Also the height and the direction of fracture were determined with the help of tools and fracture propagation in horizontal wellbore was estimated. Such approach when a wide set of challenges at initial stage is met allows us to be sure that chosen engineering solutions are suitable. 

References
1. “Gazprom neft'” namerena k 2015 g. razrabatyvat' 60 mln. t trudnoizvlekaemykh zapasov (Gazprom Neft intends to develop 60 million tons of hard to recover reserves in 2015), AEI Praym, 2013, URL: http://mfd.ru/news/view/?id=1820869.
2. Kryanev D.Yu., Zhdanov S.A., Burenie i neft', 2012, no. 8, pp. 29-32.


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