Lithologic Reservoirs ›› 2021, Vol. 33 ›› Issue (4): 166-175.doi: 10.12108/yxyqc.20210418

• PETROLEUM ENGINEERING • Previous Articles     Next Articles

Stress-sensitive productivity model of fractured horizontal wells in volcanic reservoirs

KONG Chuixian1, BA Zhongchen1, CUI Zhisong1, HUA Meirui1, LIU Yuetian2, MA Jing2   

  1. 1. Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China;
    2. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum(Beijing), Beijing 102249, China
  • Received:2020-08-25 Revised:2020-10-18 Online:2021-08-01 Published:2021-08-06

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Abstract: Natural fractures are developed in the volcanic reservoirs which are dual medium. Due to the stress sensitivity of the reservoirs,the production of volcanic reservoirs is significantly affected by changes in formation pressure,and there is a threshold gradient pressure phenomenon,so there is currently no productivity model suitable for the characteristics of volcanic reservoirs. Based on the dual media model,a coupling multi-scale（matrixfracture zone,fracture network reform zone,partial fracture network reform zone,artificial fracture zone）seepage model of fractured horizontal wells in volcanic reservoir was established,which was solved by Laplace transformation,Duhamel principle and superposition principle in Lagrangian space. The corresponding pressure dynamic response curve and dimensionless production curve were obtained by Stehfest numerical inversion,and the sensitivity analysis of different influencing factors was performed. The results show that the width and length of the fractured zone mainly affect the intermediate flow stage,while the width,length,non-Darcy flow and stress sensitivity of the unfractured zone mainly affect the later flow stage. The established compound flow model can accurately predict the productivity of bottomless volcanic reservoirs. There is certain guiding significance for the calculation of productivity of volcanic reservoirs.

Key words: volcanic rock, compound flow model, production calculation, sensitivity analysis

CLC Number: 

  • TE349
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