西南石油大学学报(自然科学版)

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Effect of Non-Darcy Flow Moving Boundary of High Velocity Nearby
Wellbore on Productivity Prediction

Li Yuansheng1,2*, Li Xiangfang1, Teng Sainan3, Xu Darong1, He Xiangnan4   

  1. 1. MOE Key Laboratory of Petroleum Engineering,China University of Petroleum,Changping,Beijing 102249,China
    2. Institute of Shanghai Offshore Petroleum Branch,CNOOC,Xuhui,Shanghai 200030,China
    3. Shanghai Branch of SINOPEC Ltd.,Pudong,Shanghai 200120,China
    4. Institute of Yanchang Petroleum Co,Ltd.,Xi′ an,Shaanxi 710000,China
  • Online:2015-02-01 Published:2015-02-01

Abstract:

To better understand the effect of the non-Darcy flow moving boundary,the effect of non-Darcy flow near wellbore
caused by high velocity on productivity prediction was studied. Based on seepage theory and inertial theory,the non-Darcy
moving boundary equation and a new deliverability equation are derivated. Then we proposed the concepts of critical permeability,
critical productivity and critical pressure,and the non-Darcy boundary skin factor. Only when permeability,gas rate
and pressure are all larger than critical value,non-Darcy flow appears. And a non-Darcy moving boundary skin factor is a
function of permeability,porosity,critical Reynolds number and β expressions,which reflects the effect of the petrophysical
properties. And the larger the skin is,the narrower the moving boundary is and the greater its effect. Finally,a comparison with
conventional deliverability equation revealed that,if the permeability range is 1∼10 mD,significant differences exist in these
IPR curves. This paper proposed the effect of non-Darcy flow moving boundary on production prediction,which improve the
accuracy of the productivity prediction.

Key words: near wellbore, non-Darcy moving boundary of high velocity, Reynolds number, deliverability equation, productivity
prediction