Research On Multi-stage Fracturing Productivity Analysis Method Of Horizontal Wells In Tight Sandstone Gas Reservoirs

Tight sandstone gas reservoirs are a very important part of unconventional resources,and they are not only widely distributed at home but abroad.Huge resource reserves have made the research and exploitation of tight sandstone gas reservoirs became a hot issue for gas reservoir development.Long-term exploitation and practice prove that fracturing technology is the most economical and effective means to exploit such gas reservoirs.The large-scale and multi-stage fracturing has increased the seepage channel of the formation,and at the same time,it has greatly increased the output of single well,so realized the economic development of a tight sandstone gas reservoir.The tight sandstone gas reservoirs in western Sichuan are narrow channel sand body gas reservoir type.These types of sand bodies have features such as narrow channel width(typically 300m),long extension(5?15km),and rapid deposition thickness change.Due to the large differences in reservoir properties,resulting in very uneven distribution of production capacity in various types of wells and control volume of individual wells,how to optimize the production of such gas reservoirs has become a problem that must be paid attention to by development staff.Based on a thorough investigation of the productivity of vertical wells and conventional horizontal wells,this paper establishes a multi-level fracturing horizontal well productivity model.Through analysis,it has been found that the calculation of large-scale and multi-fracture wells requires a very large number of uncertain parameters,and it is even more difficult to obtain single well productivity on the basis of lack of production test data.This paper uses multi-stage fracturing models to establish production.A data fitting model was used to obtain a new method for multi-stage fracturing productivity analysis of horizontal wells in tight sandstone gas reservoirs based on back-calculated production capacity of dynamic production data.This method was used to analyze the production capacity of more than 50 wells in the Zhongjiang and Gaomiao gas fields in western Sichuan,and verifying the reliability and practicality of the method.The research results in this paper have a certain guiding significance for the exploitation of tight sandstone gas reservoirs,and can also provide some help in the stable production and production increase of tight sandstone gas reservoirs.