In the given work the estimation of efficiency of practice of wide application of horizontal drilling on Sugmut reservoir, one of the largest in Russia is presented.

The reservoir is in development of 10 years, significant reserves of oil are concentrated in a water-oil zone. At the first stage of drilling, at realization of three-row system of development by vertical wells there was a problem of nonuniform development of reserves with formation of the centers of active movement of fluids and stagnant zones, effects early water cut wells, annulus overflows were showed.

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