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Transient pressure behavior of acid fracturing oil wells in fractured low permeability carbonate reservoir

Shi Wen-yang,Yao Yue-dong,Cheng Shi-qing,Shi Zhi-liang,Gao Min
Shi Wen-yang,Yao Yue-dong,Cheng Shi-qing,Shi Zhi-liang,Gao Min
  

  1. 1.State Key Laboratory of Petroleum Resources and Prospecting,China Universityof Petroleum(Beijing),Beijing 102249,China;
    2.College of Petroleum Engineering,China University of Petroleum(Beijing),Beijing 102249,China;
    3.Petroleum Exploration & Production Research Institute,SINOPEC,Beijing 100083,China;
    4.No.4 Oil Production Plant,PCOC,Yulin 718500,China
  • Received:2018-01-11 Revised:2018-03-03 Online:2018-04-10 Published:2018-04-10

Abstract:

Fractured low permeability carbonate reservoirs are triple porosity media with low porosity and low permeability,but there are natural dissolved vugs and natural fractures in the reservoir rock.Considering low speed non-Darcy seepage in reservoir rocks and stress sensitivity of natural fractures and acid fracturing fractures,a transient pressure behavior model of acid fracturing oil well in fractured low permeability carbonate reservoirs is established.Using logarithmic transformation and perturbation method,the transient pressure solution of real space is obtained,further,it analyzes the effect of low speed non-Darcy in reservoir rock,stress sensitivity of fractures,rock property improvement degree,flow channel improvement degree,acid fracturing area.The result shows the more obvious the low speed non-Darcy flow and stress sensitivity is,the more warping and bending the type curve is.The model can be used to evaluate the effect of the acid fracturing and evaluation of unstable productivity on carbonate reservoirs,identification and judgment of acid fracturing area and acid fracturing degree is of guiding significance to oil well increasing production measures,such as repeated fracturing,acidification and plugging,in fractured low permeability carbonate reservoirs.

Key words: Fractured carbonate reservoir, Low permeability carbonate reservoir, Acid fracturing, Low speed non-Darcy flow, Stress sensitivity, Transient pressure behavior

CLC Number: 

  • TE357

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