Application of the Multi-Stage Hydraulic Fracturing Technology in Horizontal Wells with Large Vertical Outflow to Improve the Development Efficiency of Reservoirs with Deteriorated Filtration-Capacitance Properties at the Sakhalin Shelf Field

Abstract

The article presents the projected results of the offshore development option in the zone of deteriorated filtration-capacitance properties. To involve additional oil reserves in the development, it is proposed to use multi-stage hydraulic fracturing technology at the projected horizontal wells. The analysis was executed using modern methods of geological, hydrodynamic and geomechanical modeling. Method of most favorable zones’ isolation for carrying out multi-stage hydraulic fracturing of formation based on maps of permeability, current formation pressure, density of residual movable oil reserves and cover power is proposed. Taking into account the selected zones and the expected direction of crack development, the trajectories of new horizontal wells with a large deviation from the vertical were optimized. Efficiency assessment was carried out by comparing the technical and economic parameters of the proposed development option (horizontal wells with multi-stage hydraulic fracturing of the formation) with the basic version (horizontal wells with traditional completion). A hydrodynamic model was used to calculate oil production levels according to options. As a result, it was proved that the use of multi-stage hydraulic fracturing technology will involve additional oil reserves in the development and increase the efficiency of expensive offshore drilling.

Performance Evaluation of Multistage Fractured Horizontal Wells in Tight Gas Reservoirs at Block M, Ordos Basin

“…Salah et al [29] comparatively analyzed three fracturing technologies, i.e., cemented P-n-P, cemented shiftable sliding sleeves with dissolvable isolation drop ball, and abrasive jetting perforation and annular pumping (AJPAP) with sand plug diversion, in terms of principle, advantages and disadvantages, field application, and effectiveness, and they concluded that there is no fit-for-all fracturing treatment; instead, the fracturing process should be designed comprehensively from economic and technical aspects. Subsequently, Prudskiy et al [30] demonstrated the application effect of horizontal well multistage hydraulic fracturing technology in the Sakhalin Shelf oilfield in contrast to traditional horizontal well completion methods, while Li et al [31] compared the characteristics and application of P-n-P with multi-cluster perforation with early applied fracturing technology and OH hydra-jet multistage fracturing with fixed string in the Sulige gas field. Both studies coincidentally indicated that the latter techniques significantly improved the productivity of horizontal wells.…”