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Long W.,Schlumberger | Bits S.,Schlumberger | Shulga V.,OJSC Verkhnechonskneftegaz
Hart's E and P | Year: 2012

One of the key factors facing drillers is the ability to maintain good directional control while achieving high penetration rates. For the past five years, drilling engineers at Verkhnechonskneftegaz (VCNG), together with service company advisors, have made steady improvement in drilling performance by studying drilling records and making systematic improvements to the bottomhole assembly (BHA). For help in drilling hard rocks, engineers specified a drilling system with the SHARC high abrasion resistance PDC drill bit and the PowerDrive vortex-powered RSS. The RSS gets its main drilling power from the rig's top drive but is speed-boosted by an inline PDM located in the BHA. Laboratory tests indicated that further ROP improvement could be attained by fitting the drill bit with the new ONYX II premium PDC cutters. This proved to be the ideal combination for the tough interbedded carbonate and evaporite sequences.

Chertovskikh E.O.,OJSC Verkhnechonskneftegaz | Alekseev S.V.,Russian Academy of Sciences
Society of Petroleum Engineers - SPE Russian Oil and Gas Exploration and Production Technical Conference and Exhibition 2014, RO and G 2014 - Sustaining and Optimising Production: Challenging the Limits with Technology | Year: 2014

The article is devoted to the problem of scaling in the Verkhnechonskoye oil and gas condensate field. The history of gypsum scaling in VC Field is briefly reviewed. Presented are results of studies conducted in the oil field conditions to select and justify an appropriate technological solution for removal of the gypsum scale. The gypsum removal technology envisages well treatment with a fluid containing caustic soda. Potential causes of gypsum scaling in VC Field are revealed with reference to results of analyses of the consolidated field database. A theoretical justification of geochemical conditions of gypsum scaling in VC Field is proposed. Wells located in gypsum-scaling risk zones in VC Field are identified. The authors give recommendations concerning development of the gypsum removal technology for VC Field. Copyright 2014. Society of Petroleum Engineers.

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