西南石油大学学报(自然科学版)

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Study on Occurrence Feature of Fluid and Effective Development in
Tight Sandstone Oil Reservoir

Yang Zhengming*, Luo Yutian, He Ying, Guo Hekun, Zhao Yuji   

  1. Langfang Branch,Petrochina Research Institute of Petroleum Exploration & Development,Langfang,Hebei 065007,China
  • Online:2015-06-01 Published:2015-06-01

Abstract:

The occurrence feature of fluid in tight oil cores with different permeability was studied using nuclear magnetic
resonance(NMR)and centrifuge. The results indicate that the low limit of throat radius for movable fluid in tight oil reservoir
is 0.05 µm;the fluid percentage controlled by the nanometer throat radius rise;sharply as permeability decreases,the movable
fluid percentage controlled by the nanometer throat radius rises gradually as permeability decrease,the fluid and movable fluid
percentage which was controlled by the micron throat radius was a sharp drop as permeability decreases;the fluid and movable
fluid percentage controlled by the submicron throat radius first increases and then decreases as permeability decreases. Based
on the above findings,the effect of different wells combinations and different development scheme on effective development
was studied with reservoir numerical simulation technique. The results reveal that development effect of CO2 injection for
replenishing energy in staged fracturing horizontal wells is the best,and water injection takes second place,while depletion
gets the worst effect.

Key words: tight oil reservoir, movable fluid, occurrence, effective development, staged-fracturing horizontal well