Lithologic Reservoirs ›› 2024, Vol. 36 ›› Issue (3): 172-179.doi: 10.12108/yxyqc.20240316

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEVELOPMENT • Previous Articles    

Characteristics of fracture interference between horizontal wells in tight reservoirs considering threshold pressure gradient

ZHONG Huiying1, YU Chengzhi1, SHEN Wenxia1, BI Yongbin1,2, YI Ran3, NI Haoming4   

  1. 1. Key Laboratory of Enhanced Recovery of Ministry of Education, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Nanpu Oilfield Operation Distric, PetroChina Jidong Oilfield Company, Tangshan 063005, Hebei, China;
    3. No. 6 Oil Production Plant, PetroChina Daqing Oilfield Company, Daqing 163114, Heilongjiang, China;
    4. Ordos Research Institute of Energy, Peking University, Ordos 017010, Inner Mongolia, China
  • Received:2023-08-03 Revised:2023-09-04 Published:2024-04-30

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Abstract: In view of the problems of fracture interference between horizontal wells during volume fracturing in tight reservoir development, based on the trilinear flow model, semi permeable boundary condition and interwell interference coefficient（α）were introduced to establish fracture interference percolation model of tight reservoir horizontal wells considering threshold pressure gradient in unreformed area, and the bottomhole pressure performance and production decline characteristics of horizontal wells under different interference conditions were studied. The results show that:（1）The larger the α, the more the number of fracture interference, the longer the duration of linear flow in the pressure dynamic curve transformation area, and the later the occurrence of cross flow and quasi stable flow in the transformation area. The larger the threshold pressure gradient in the unreformed area, the earlier the occurrence of quasi stable flow.（2）The larger the fracture conductivity, the earlier the linear flow of the main fracture occurs, and the closer the fracture conductivity of two wells. The influence of α on pressure dynamics is more obvious.（3）Horizontal wells with larger α and relatively lower bottom hole pressure have higher initial production, but in the later stage, the production decreases more significantly. The larger the dimensionless threshold pressure gradient, the faster the later production decline.（4）The smaller the fracture conductivity, the lower the production curves in the early stage. When the fracture conductivity of two wells is similar, α has a relatively large impact on production.

Key words: tight reservoir, interwell interference coefficient, threshold pressure gradient, fracture conductivity, percolation characteristics

CLC Number: 

  • TE319
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