Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 160-170.doi: 10.12108/yxyqc.20220614

• PETROLEUM ENGINEERING AND OIL & GAS FIELD DEBELOPMENT • Previous Articles    

Profile change rule during Cr3+ polymer weak gel flooding and related improving method

XIE Kun1, SU Cheng1, LIU Changlong2, MEI Jie1, YU Haitao3, HE Xin1, LU Xiangguo1   

  1. 1. Key Laboratory of Enhanced Oil and Gas Recovery of Ministry of Education, Northeast Petroleum University, Daqing 163318, Heilongjiang, China;
    2. Bohai Oilfield Research Institute, Tianjin Branch of CNOOC(China) Co., Ltd., Tianjin 300459, China;
    3. College of Earth Sciences, Northeast Petroleum University, Daqing 163318, Heilongjiang, China
  • Received:2022-01-12 Revised:2022-05-03 Published:2022-11-09

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Abstract: The Cr3+ polymer week gel with molecular intra-crosslinking was used to study the influences of slug size， core permeability and crude oil viscosity on reservoir absorption profile and production profile by core displacement experiment. The experiments of plugging/profile control/flooding were carried out in Oligocene Dongying Formation in LD10-1 block of Bohai Oilfield. The results show that： （1）The slug size of profile control agent has no effect on the turning of fluid flow at both ends of injection and production and the turning time of profile，but when the slug size per unit volume exceeds 0.3 PV，the increase rate of Cr3+ polymer weak gel to enhance crude oil recovery decreases. With the increase of reservoir permeability ratio and crude oil viscosity，the turning time of fluid flow at both ends of injection and production is delayed and the turning time of profile is advanced.（2）Three measures including organic and inorganic composite gel system plugging high permeability layer，polymer microspheres regulating micro heterogeneity， and heavy oil mobility improver improving oil displacement efficiency，can be implemented at the same time，which can improve the recovery after polymer weak gel profile control and flooding.（3）The EOR mechanism of plugging/profile control/flooding combination is： plugging the dominant seepage channel to expand the macro swept volume of heterogeneous reservoir， bridging and blocking polymer microspheres in variable diameter pores or throats to realize micro fluid flow diversion， and high-efficiency oil displacement agent can enter the unswept pore throat area to play three roles， including reducing viscosity crude oil， reducing oil-water interfacial tension， and high-efficiency displacement.

Key words: polymer weak gel, profile change, plugging/profile control/flooding, physical simulation, Dongying Formation, Oligocene, LD10-1 block, Bohai Oilfield

CLC Number: 

  • TE357
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