西南石油大学学报(自然科学版)

Previous Articles     Next Articles

Optimization Technology for Horizontal Well Pattern in Ultra-low
Permeable Tight Reservoirs

Zhao Jiyong, He Yonghong, Fan Jianming, Li Shuheng, Wang Shitou   

  1. Ultra-low Permeability Reservoirs Research Center of Changqing Oilfield Branch,PetroChina,Xi′ an,Shaanxi 710018,China
  • Online:2014-04-01 Published:2014-04-01

Abstract:

There is abundant petro-resources with great development potential in the ultra-low permeable reservoirs located
in Ordos Basin;however,it is difficult to increase the production rate of single well drastically as the formation is of poor
reservoir properties and strong heterogeneity. According to the characteristics of ultra-low permeable formation,the study is
carried out focusing on horizontal well pattern,well drainage direction,parameters of horizontal section and producer-injector
spacing,to establish the effective displacement pressure system. According to the studies,the research results show that the
well pattern is the crisscross row pattern,which is the joint cloth well for the horizontal and vertical wells;the artificial pressure
crack pattern is the dumbbell-shaped;the density of artificial fracture is 2/(100 m);the length of horizontal section ranges from
700 to 800 m;the producer-injector spacing ranges from 700 to 800 m;the row spacing is about 150 m. Based on the research
results for the horizontal well pattern design,the average initial production rate of single horizontal well in ultra-low permeable
reservoirs is about 8.0 t/d,which is 4 times of the average production rate of vertical well. This proves that this method can
improve the well production rate of ultra-low permeable reservoirs drastically.

Key words: ultra-low permeability, tight sandstone, horizontal well, optimization technology of well pattern, Ordos Basin