POSSIBILITY OF RAISING ENJECTIVITY OF SOME SEPARATE SECTORS OF HORIZONTAL INJECTIVE WELLBORES
The article considers problems of efficient usage of injective wells with horizontal wellbores of big length with wellbores of 0,3 km length till several tens of kilometers. Remarkable length of horizontal wellbore and heterogeneous permeability provide heterogeneity of injected water movement from injective wells, and consequently, irregularity of oil stocks extraction. Permeability of different sections of a horizontal wellbore of one and the same well can differ of tens of times. The above-mentioned conditions bring the problem of active regulation of injection zones with low permeable rock. This provides possibility of increasing pumped water outflow, required for water flooding with further regulation of its flows from a horizontal wellbore. To achieve this some territories are equipped with portable devices, providing active wave impact on rock permeability like local wave generators. There exists some perspective of usage of injective wells with big length of a horizontal wellbore, provided by wave devices during oil fields development when producing wellbores are found in the cover of an oil formation while injective wellbores are located at a water-oil contact level or even in the cover of a nearly placed formation. Herewith, simultaneous vertical-horizontal water-flooding by formation water through vertical fractures of the formation is planned. Efficiency and duration of operation of injective wells with horizontal wellbores of big length are determined during periodic test researches, planned beforehand, by means of application of some special technology which envisages usage of a flow-meter during reverse circulation of liquid along a wellbore, escaping useless water injection.