Prediction Of Segmental Fracturing Productivity Of Horizontal Wells In Stress Sensitive Tight Reservoirs

The Junggar Basin in Xinjiang is a tight glutenite reservoir.The reservoir distribution is controlled by the distribution of sand bodies and physical properties.It is a typical tight reservoir.The traditional vertical well fracturing technology was adopted in the early stage of the ring,but the development effect was not obvious.Therefore,in order to maximize the production of the Jingmahu block in the tight reservoir of the Zhungeer Basin,the development of the horizontal well segmented fracturing technology was selected as the most important technical means for exploiting the tight reservoir.This block has not been established a predictive model for post-pressure production in tight reservoirs with stress sensitivity.The influencing factors of production capacity have not been studied in detail.The fracturing design parameters mostly rely on field experience.Therefore,the optimization of fracturing fracture parameters in tight reservoirs with stress sensitivity has important guiding significance for the later construction design.The Ma 131 well area in Mahu block was selected to analyze the reservoir characteristics and seepage characteristics,and the stress sensitivity characteristics of the area were determined.The post-fracture productivity prediction formula was preliminarily established considering the stress sensitivity.Based on this,an overall analysis of the factors affecting the productivity of tight sandstone conglomerate reservoirs was conducted.It was determined that the stress-sensitive effects of this block had a significant negative effect on the production capacity of fracturing horizontal wells.Using information analysis methods,the main control factors of the block production capacity were analyzed,and the key factors affecting the productivity were identified as the number of cracks,the amount of sand added to a single joint,and The length of the horizontal section of horizontal wells and the storage capacity factor are also important factors.Other factors are the general factors affecting production capacity.The use of modern production analysis methods,inversion of reservoir permeability,crack length.A mathematical model was established to analyze the influence of the number of cracks,the length of cracks,and the conductivity on the production capacity,and the optimal crack parameters were optimized.Finally,the fracturing design is designed to optimize the fracturing scheme.