Nowadays the oil production level is in decline because the oil reserves of the largest oil places are depleted. Therefore, the main prospects for increasing of the oil production level are associated with the development of low-permeability reservoirs with tight oil reserves. The Priobskoye field is currently one of the largest unconventional reservoirs in the Western Siberia. This field is characterized by low permeability and complex reservoir structure. Currently various types of well patterns are used for the development of reservoirs with low effective matrix permeability. These types of well patterns contain the horizontal wells with multiple hydraulic fractures. There is wherein a dependence of the used type of well pattern on permeability, the structure and sedimentation conditions of the reservoir.
The article presents an overview of the implementation of various development systems based on multi-stage hydraulic fracturing, which are used to improve the efficiency of reserves development in the low-permeability areas of the AC10-12 resevoir of the Priobskoye field. The current results of the implementation are given for the following types of the well pattern: 1) basic; 2) infill; 3) multilayer; 4) transverse (horizontal wells are drilled perpendicular the direction to the regional stress); 5) improved well row spacing; 6) waterflooding using injection horizontal wells. The comparison of wells liquid production decline rate, wells total oil production between the considered type of the well pattern and the basic type of the well pattern was made (during a first year). It is shown that the development with the use of various types of well patterns is more effective for ultra-low permeability reservoirs in case of the Priobskoye field than with the use only the basic type of the well pattern.
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