Horizontal Well Fracturing Multiple Fracture Stress Disturbance Size Simulation And Application Research

The Jinlong 10 well area belongs to a special low-permeability reservoir in the Carboniferous,and the horizontal well fracturing and sectionalization transformation is needed to greatly increase the production capacity of the well.The segmented fracturing technology of quick-drilling bridge plugs is widely used in Xinjiang oilfields and has become the main process for the transformation of low-permeability and low-porosity reservoirs in Xinjiang oilfields.During the on-site reconstruction process,multiple cracks such as distortions and turnings occurred in the near-wellbore zone of the horizontal well section,resulting in sand plugging or construction failure.To solve this problem,many scholars applied numerical simulation and finite element analysis methods to study.The causes of multiple fractures are analyzed,and the multi-fracture stress disturbance phenomenon is proposed to realize the unconventional reservoir volume fracturing technology.Based on previous studies,this paper uses gohfer,meyer,and stimplan software to build models and optimize the segment spacing and Two important parameters of the cluster spacing,and analyzed the impact of interference factors and displacement on the multiple crack stress interference,reached the following points:(1)Simulation results show that the spacing of sections has important influence on the effect of reservoir reform: the interval between sections is too large,the area of the target reservoir is reduced,the production is reduced,and the payback period is prolonged;on the contrary,the investment cost increases and the output increases.Steady production period shortened.(2)Horizontal wells are fractured by stages,and the distance between perforation clusters is an important parameter affecting the propagation of cracks in each cluster.Too small cluster spacing results in overlapping of the main cracks in the reformed areaand reduces the transformation effect;The large cluster spacing design will result in some transformation areas that have not been effectively transformed or have not been modified,thus affecting the degree of reservoir utilization.(3)Interference factor is a physical quantity that measures the strength of multi-fracture stress disturbances.It also indicates that the interfering stress existing between fractures is a resistance or a condition for cracks to turn.Through simulation analysis: when the interference factor is 0.8,artificial fractures can be more Good formation of complex seams.(4)In the construction of unconventional reservoirs,it is generally considered that the larger the displacement,the greater the amount of liquid injected into the pump,and the larger the scale of the transformation.However,as the displacement increases,the construction pressure also increases substantially.The construction risk increases the cost,the number of artificial cracks opened is more,the stronger the interference between the seams,the shorter the stable production period.The study results and the horizontal well fracturing simulation software model have guiding significance for the optimization of fracturing design parameters and productivity prediction.