Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (3): 164-170.doi: 10.12108/yxyqc.20220315

• PETROLEUM ENGINEERING AND OILFIELD DEVELOPMENT • Previous Articles    

Pressure transient of polymer flooding considering induced fractures based on PEBI grid

ZHONG Huiying1, SHEN Wenxia1, ZANG Qiuyuan2, XU Yanrui1   

  1. 1. Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Downhole Service Company, PetroChina Daqing Oilfield Company, Daqing 163311, Heilongjiang, China
  • Received:2021-08-12 Revised:2021-12-19 Online:2022-05-01 Published:2022-05-12

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Abstract: Based on PEBI grid method，by considering the situation that the polymer injection well will produce induced fractures during the injection process，and taking into account the rheology of polymer solution，shear thinning，permeability reduction and adsorption mechanism，a mathematical model of polymer flooding considering vertical induced fractures was established. The finite volume method was used to discrete the mathematical model， and then the numerical solution of bottom hole pressure was obtained. The double logarithmic curve of pressure and pressure derivative was plotted and the influencing factors were analyzed. The results show that： （1）The well test curve of polymer flooding for vertically fractured well can be divided into five flow stages：pure wellbore storage stage，bilinear flow stage，linear flow stage，elliptical flow stage and radial flow stage. Polymer concentration mainly affects the later stage of well test curve. The higher the concentration，the more upward the curves at the bilinear flow stage and non-Newtonian radial flow stage.（2）The shorter the half-length of induced fractures，the more obvious the upward curve of pressure and pressure derivative. Compared with the pressure dynamic curves considering induced fracture closure in water drive，the numerical calculation method of polymer flooding considering induced fracture based on hybrid PEBI grid can accurately describe the pressure transient after induced fracture closure.（3）When the value of the fracture closure velocity factor（delpat）is 0，the fracture closes instantaneously and the pressure change suddenly，it is shown as an obvious peak in the pressure derivative diagram. The larger the delpat is，the slower the closure velocity is，the lower the derivative peak is，and the more the curve shifts to the right.

Key words: PEBI grid, polymer flooding, induced fracture, numerical well test, fracture closure, pressure transient

CLC Number: 

  • TE319
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