Lithologic Reservoirs ›› 2017, Vol. 29 ›› Issue (5): 155-161.doi: 10.3969/j.issn.1673-8926.2017.05.019

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Optimization of technological parameters and evaluation of reservoir adaptation by water plugging and profile control: a case from Bohai SZ36-1 oilfield

ZHANG Baokang1, XU Guorui1, TIE Leilei1, SU Xin2, LU Xiangguo2, YAN Dong2   

  1. 1. China Oilfield Services Limited of Tianjin Branch, Tianjin 300452, China;
    2. Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 163318, Heilongjiang China
  • Received:2017-04-05 Revised:2017-06-21 Online:2017-09-21 Published:2017-09-21

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Abstract: SZ36-1 oilfield in Bohai has the characteristics of high crude oil viscosity,single well water injection quantity,and the reservoir is characterized by loose cementation,strong heterogeneity and high permeability. The water injection development resulted in breakthrough phenomenon and damaged reservoir structure,which urgently needs to be taken fluid diversion measures. Taking injection pressure,water cut and oil recovery as evaluation indexes,the effect of water shutoff and profile control joint operation on increasing oil and decreasing water and its influencing factors were studied by experiment. The results show that water shutoff agent optimization composition of 4%+ 4% starch acrylamide + 0.036% crosslinking agent + 0.012% initiator + 0.002% anhydrous sodium sulfite,plugging agent slug optimization combination 0.05 PV segment prefix plug(4% starch)+ 0.025 PV to 0.075 PV plugging agent and protective slug 0.025 PV(4% starch)+ replace segment plug 0.05 PV(polymer solution,CP=1 500 mg/L),optimization of profile control agent composition and slug combination 0.05 PV to 0.10 PV profile control agent(Cr3+ polymer gel,CP=3 500 mg/L). With the increase of reservoir heterogeneity and oil viscosity,the growth rate of oil recovery increases. The joint operation of profile control and water plugging has strong reservoir adaptability.

Key words: two-way wave equation, forward modeling, reflection coefficient, amplitude, graphic process unit

CLC Number: 

  • TE357
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