This article shows the first experience of using Schlumberger technologies for production stimulation on Orenburg oil-gas-condensate field (ONGKM). 3 matrix acidizing treatments via Coiled tubing were successfully performed using several technologies: VDA*, OilSEEKER*, SXE*, FoamMAT*.

ONGKM is a biggest field in Orenburg region, field was started to operate in 1974. Maximum production was achieved in period from 1979 to 1984. Since 1985 production of the field started to decline. The main gascondensate formation confined to carbonate layer of artinsko-srednekamennougolny geological age which consist of limestone with dolomite interlayers. Reservoir TVD is 1350–1900 m with gross height between 275 to 525 m and low BHST (30 deg.C). Gas saturated layer is in contact with active aquifer. Formation itself consists of 3 sublayers with different reservoir properties called Object I, II and III.

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