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The effectiveness of horizontal wells is tested mainly for increase of oil withdrawal in comparison with usual vertical wells and more rarely for increase of oil recovery factor. In spite of long time application of horizontal wells in Tatarstan Republic, Russia, its efficiency is comparatively low: flow rates of horizontal wells are in 1,5-2,2 times hither than flow rates of vertical wells. The article deals with geological conditions for the effective application of horizontal wells and their limitation for the development of oil and gas fields. Particular attention is paid to the state analysis and the efficiency improvement of horizontal wells operation during field development with introduction of various water flooding systems. The highest technical and economic indicators of field development with horizontal wells are obtained by their systematic use taking into account the experience of developing oil fields with vertical wells, compliance with principles accumulated for decades of the rational field development by means of flooding.

Ways to Improve the Efficiency of Horizontal Wells for the Development of Oil and Gas Field