Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (6): 152-159.doi: 10.12108/yxyqc.20220613

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

Formation mechanism and percolation characteristics of secondary foamy oil by gas injection in super heavy oil

LU Yingbo   

  1. Fengcheng Oilfield District, PetroChina Xinjiang Oilfield Company, Karamay 834000, Xinjiang, China
  • Received:2022-02-28 Revised:2022-05-23 Online:2022-11-01 Published:2022-11-09

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Abstract: In order to explore the formation mechanism， percolation characteristics and displacement effect of foamy oil in super heavy oil reservoir， the oil and reservoir parameters of Jurassic Qigu Formation in Wuxia fault zone in the northwestern margin of Junggar Basin were used to select gas injection medium for foamy oil formation and carry out the testing experiment of bubble point pressure of crude oil. The gas injection microscopic visualization and sand-filling pipe displacement experiments were carried out to analyze the percolation characteristics of foamy oil formed by gas injection， and the oil displacement effect of gas injection foamy oil was evaluated. The results show that： （1）The bubble point pressure of the crude oil of Jurassic Qigu Formation in Wuxia fault zone in the northwestern margin of Junggar Basin is 9.7 MPa. The pseudo-bubble point pressure increases with the increase of gas injection volume and temperature， the pseudo-bubble point pressure at 50 °C increases with the increase of CO2 injection，and the pressure rises slowly. The reservoir has good gas injection characteristics. （2）The flow of foamy oil in the study area can be divided into five stages：no bubble stage， bubble precipitation stage， bubble expansion stage，bubble coalescence stage and bubble extinction stage.（3）The recovery of steam+ CO2 flooding is 13.3% higher than that of pure steam sand-filled pipe flooding. With the release of pressure，the number of bubbles increases gradually， and the oil production increases gradually. When the pressure drops to the bubble point pressure，the number of bubbles tends to be stable and form relatively stable foamy oil，and the oil production increases greatly，which is the main oil production period. When the pressure is released to the pseudobubble point pressure，the number of bubbles will decrease rapidly，the foam oil will disappear gradually，and the oil production will decrease slowly.

Key words: super heavy oil, foamy oil, bubble point pressure, oil displacement mechanism, percolation characteristics, Qigu Formation, Jurassic, Wuxia fault zone, northwestern margin of Junggar Basin

CLC Number: 

  • TE121.3
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