Well Spacing and Cluster Spacing Optimization for Horizontal Well Volume Stimulation
Aiming at well spacing and cluster spacing optimization for horizontal wells,Chang 7 Formation in Ordos Basin is studied.Based on the integrated workflow through geology to engineering,3D geological model and geomechanical model are built firstly with its geologic characteristics.Multi-stage fracturing design is simulated with various cluster spacing,and well spacing could be optimized by frequency distribution of full fracture length.Unstructured grid is used to predict the performance of a horizontal well and the best cluster spacing case is confirmed.Results from analysis of numerical simulation show that:it is recommended to optimize well spacing according to the cumulative frequency distribution of fracture length,like P90.It would be helpful to improve the controlling degree of complex fracture network on reserves.With cluster spacing ranging from 3 m to 5 m,it's recommended to decrease lateral spacing to about 200 m;with tighter cluster spacing of 3 m instead of 15 m,the surface area of propped fractures could increase by 108％,and volume stimulation degree increase by 142％for the target formation;with tighter cluster spacing of 3 m instead of 15 m,cumulative oil production increase by 75.91％in 3 years;rate of return on investment can't be realized by cluster spacing of 3 m,and the recommended plan would be 5 m.
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