Although the Neocomian formation is considered lean, with only 2% condensate drop-out, initial frac treatments in the Yamburgskoe Field with 10 tonnes of small mesh intermediate strength ceramic could not accommodate the significant non-Darcy and multiphase flow. Wide, conductive fractures with large diameter ceramic proppant were placed using TSO designs in 9 wells, achieving over 400% average rate improvement.
Optimized hydraulic propped fracturing has proven to be the key to success for many operating companies in the West Siberian oil fields. The application of hydraulic propped fracturing stimulation in medium-permeability gas condensate formations was once considered uncertain because of mixed results in the past.
The particular conditions in a severe arctic and permafrost environment, however, required a range of specific completion and stimulation techniques for the Neocomian reservoir, including hydraulic fracturing.
The changes in fracturing treatment design in this gas condensate reservoir were made in adherence to an integrated project management approach, using forward modeling and reservoir and wellbore production simulation to mostly negate retrograde condensate effects.
The paper provides a comprehensive analysis of the work that was done on these gas condensate wells, focusing on the post-fracturing production analysis including production effects with time, factors affecting productivity, and post-fracturing production modeling.
Unprecedented productivity results, when compared to peer wells in the Yamburgskoe field, were realized from the treatments performed. The nine-well case history dataset presented in the paper confirms the effect of using this comprehensive approach to propped hydraulic fracture treatments in a Russian gas condensate reservoir.
Author(s): SPE, SPE, Schlumberger, K.K. Butula, J. Maniere, A. Shandrygin, and D. Rudenko, and I.A. Zynchenko, GAZPROM
Paper Number: PE 94727