西南石油大学学报(自然科学版) ›› 2010, Vol. 32 ›› Issue (1): 80-84.DOI: 10.3863/j.issn.1674-5086.2010.01.014

• 石油与天然气工程 • Previous Articles     Next Articles

A COMPUTING METHOD FOR LAYERED PRODUCTION CONTRIBUTION AND AFFECTING FACTORS ANALYZING IN COMMINGLED GAS RESERVOIRS

LIU Qi-guo1，WANG Hui1，2，WANG Rui-cheng3，LI Xiao-chang4   

  1. 1.State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation，Southwest Petroleum University，Chengdu Sichuan 610500，China；2.Nitrogen Injection Technology Co. Ltd.，Huahai Oilfield，Beijing 100020，China；3.Changqing Drilling Company，CCDC，Xi′an Shaanxi 710021，China；4.Well Logging Company，CCDC，Chongqing 400021，China
  • Received:2009-01-07 Revised:1900-01-01 Online:2010-02-20 Published:2010-02-20
  • Contact: LIU Qi-guo

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Abstract:

Flowing mechanism in the layered gas reservoirs without crossflow is analyzed and a closed circle boundary mathematical model considering wellbore storage effect and skin effect established.The model was solved with Laplace domain space，and by using Stehfest inversion algorithm，the real analytical solution of dimensionless downhole pressure and the production contribution of each layer in layered gas reservoirs are finally obtained.It is indicated that 1，if ignoring skin effect，layer production contribution is nearly equal to βj before pressure wave reaches boundary and equal to ωj when pressure wave reaches boundary and pseudosteady state is arrived，2，if skin effect exists，layer production contribution is no longer equal to βj or ωj，generally speaking，the layer with larger skin factor will contribute less while the layer with smaller skin factor will contribute more.The research results are helpful to the selection of field technologic measures and proper production allocation of gas wells.

Key words: commingled production, Laplace transform, layered production contribution, pressure behavior

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