Lithologic Reservoirs ›› 2019, Vol. 31 ›› Issue (6): 118-126.doi: 10.12108/yxyqc.20190613

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Fractal nonlinear seepage model of horizontal wells in fractured-vuggy carbonate reservoirs

JIANG Ruizhong1, ZHANG Chunguang1, GAO Yihua2, GENG Yanhong2, YU Hui1, LI Haoyuan3   

  1. 1. College of Petroleum Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China;
    2. CNOOC Research Institute Co., Ltd., Beijing 100028, China;
    3. College of Earth Sciences and Engineering, Xi'an Shiyou University, Xi'an 710000, China
  • Received:2019-04-10 Revised:2019-07-12 Online:2019-11-21 Published:2019-09-28

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Abstract: Traditional seepage theory based on Euclidean space has limitations in characterizing multi-scale characteristics and heterogeneity of fractured-vuggy carbonate reservoirs. Considering the influence of boundary layer and fluid yield stress,the nonlinear seepage characteristics of dense matrix blocks were described. In addition, the fractal theory was applied to describe the fractal characteristics of the fracture system and the stress sensitivity of reservoirs were considered. The fractal nonlinear seepage model of horizontal well in fractured-vuggy carbonate reservoir was established accordingly. The dynamic pressure curves of the horizontal well were drawn by applying finite element method to solve the seepage model. The seepage law was analyzed by comparing the dynamic pressure curves of different seepage models,and the seepage process was divided into nine flow stages. Then,the sensitivity analyses of parameters such as fractal index and nonlinear parameter were conducted,and combined with logging data,the new model was applied to mine field to explain the seepage parameters. The results show that the nonlinear parameters mainly affect the intensity of cross flow from matrix blocks to fracture system while the fractal index makes the dynamic pressure curves gradually upturned in the middle and late stages of the seepage, and the upwarping degree increases with the increase of the fractal index. The application of the fractal nonlinear model to the field shows that the model meets the actual production status of the reservoir and has a guiding significance for improving the accuracy of the well test interpretation.

Key words: fractured-vuggy, horizontal well, nonlinear, fractal theory, finite element

CLC Number: 

  • TE344
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