ANOMALOUSLY-PERMEABLE FRACTURED VEIN AND KARST VEIN CARBONATE RESERVOIR IN RIPHEAN OF THE YURUBCHEN-TOKHOMO PETROLEUM FIELD (BY FIELD-GEOLOGICAL DATA OF HORIZONTAL DRILLING)

A. G. Vakhromeev, E. M. Danilova, R. K. Razyapov, V. M. Ivanishin, R. U. Siraev

The conclusion is made on drilling-in of anomalously-permeable fractured karst reservoirs of “vein” subtype. Such consequence is based on field-geological data of exploitation drilling of horizontal wellbores up to 1000m in complex oil-saturated carbonate Riphean reservoirs of the Yurubchen-Tokhomskoye oil-gas condensate field (YuT OGCF). Relevance of gradations specification for fractured karst reservoirs in the upper, the most permeable and the most problem limit for drilling is proved by complexity of mining and geological conditions of primary tapping of oil pool by horizontal drilling. This is extremely important for quality maintenance of primary tapping of oil pool in the karst anisotropically fractured carbonate Riphean stratum in subpressure conditions and dictates fundamental necessity for replacement of traditional drilling technology by more effective closed loop one.

Key words: complex carbonate reservoirs of YuTF, “vein” reservoir, technology of primary drilling-in, oil pool, horizontal drilling.

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