Lithologic Reservoirs ›› 2023, Vol. 35 ›› Issue (4): 161-168.doi: 10.12108/yxyqc.20230415

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

Experiment on profile control and water plugging of rubber particles in inter-well single fractured-vuggy reservoir

QIAN Zhen1,2, MAO Zhiqiang3,4, ZHENG Wei5, HUANG Yuanjun1,2, CHEN Lifeng3,4, ZENG Huiyong3,4, LI Gang3,4, SONG Ai3,4   

  1. 1. Research Institute of Petroleum Engineering and Technology, Sinopec Northwest Oilfield Company, Urumqi 830011, China;
    2. Key Laboratory of Enhanced Oil Recovery in Carbonate Fractured-Vuggy Reservoirs, Sinopec, Urumqi 830011, China;
    3. Key Laboratory of Drilling and Production Engineering for Oil and Gas, Hubei Province, Wuhan 430100, China;
    4. National Engineering Research Center for Oil & Gas Drilling and Completion Technology, Yangtze University, Wuhan 430100, China;
    5. CNOOC Research Institute Co., Ltd., Beijing 100028, China
  • Received:2022-07-19 Revised:2022-09-30 Published:2023-07-01

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Abstract: Based on the model of a single-seam fractured-vuggy reservoir between wells in Tahe Oilfield，a physical simulation and displacement experiment of water plugging by rubber particle flow regulating agent was designed， the law of water flooding was analyzed，and the effects of different blocking locations，rubber particle dosage， particle size，density and injection rate on the displacement effect were discussed. The results show that：（1）The model length is 40 cm， the width is 30 cm， the thickness is 5 cm， the crack opening to is 4-20 mm， the cave diameter is 2-4 cm，the width of the wellbore is 10 mm，the crack volume of the model is 175 mL. At a temperature of 25 ℃ and atmospheric pressure，and at a water injection rate of 10 mL / min，the final degree of recovery is 43.83% when the water content of the production well reaches 98% by water injection at the rate of 10 mL/min. Due to gravity differentiation， there is a large amount of attic oil and bypass oil after water flooding， attic oil is mainly concentrated in the transverse top channel，bypass oil is mainly concentrated in the high position of the transverse middle channel and the transverse bottom channel，and the oil-water interface is flush with the high seam of the transverse middle channel.（2）In the simulation experiment，the transverse bottom channel and the transverse middle channel were blocked at the same time. The rubber particles were mixed in particle size，and the particle density is consistent with the density of the simulated formation water. The larger the amount，the greater the injection rate，and the better the flow regulation effect. When the amount of rubber particles was 0.04 PV，the particle size was less than 1 mm and 2-4 mm， and the injection rate was 15 mL/min， the recovery rate increased by 18.45%. Rubber particles with the same density as formation water can be carried and transported to the desired blocking position by injecting water，and the water blocking effect is better.（3）In the field experiment of rubber particle profile control and water plugging in well TH25X，The rubber particle size of the front section plug is 2-4 mm，the rubber particle size of the rear section plug is less than 1 mm，and the particle density is 1.13 g/cm3. Water and rubber particles were injected simultaneously at the rate of 50 m3/d， and the total amount is 920 m3. After water plugging， the cumulative oil increase is 1 200 t， and the water content decreases by 15%， achieving good plugging effect.

Key words: inter-well single structure, fractured-vuggy reservoir, profile control and water plugging, physical simulation experiment, water flooding law, rubber particles, random flow regulation, Tahe Oilfield

CLC Number: 

  • TE358.3
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