Optimization of horizontal well fracturing mode in Gaotaizi tight reservoirs of L26 well block in Daqing Oilfield

Abstract

The tight reservoir of the Gaotaizi oil layer in the L26 well area of Daqing Oilfield is a typical sand sheet deposit, with complex geological conditions. It is difficult to evaluate the production of horizontal wells in tight reservoirs with different well layout and fracturing operation scales, and the reasonable fracturing mode is unclear. Based on the study of reservoir characteristics and fracturing parameters in the area, multi-scale and multi-media well group models of sand sheet facies deposition in the Gaotaizi reservoir were established, and the reasonable well spacing under the mode of parallel and staggered fracture distribution was studied by numerical simulation. The results show that the production of horizontal wells with staggered fractures is slightly higher than that with parallel fractures. The well spacing of wells with parallel fractures is 600m, and the optimal well spacing under staggered fracturing is 500m. The results provide a basis for the optimal design of tight oil horizontal wells in the Gaotaizi reservoir of Daqing.