Lithologic Reservoirs ›› 2022, Vol. 34 ›› Issue (5): 152-161.doi: 10.12108/yxyqc.20220513

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

Physical simulation experiment of steam flooding in horizontal wells of Neogene heavy oil reservoir in Lvda oilfield,Bohai Sea

MA Kuiqian, LIU Dong, HUANG Qin   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2021-09-02 Revised:2022-06-11 Online:2022-09-01 Published:2022-09-06

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Abstract: A physical simulation experiment of steam flooding in horizontal wells was carried out on a typical heavy oil reservoir of Neogene in Lvda oilfield,Bohai Sea. The long sand-packing tube model was used to analyze the effects of steam temperature,injection rate and oil viscosity on the steam flooding effect. The dynamic characteristics of steam flooding in different production stages,the variation of temperature and the mechanism of steam flooding were discussed. The results show that:(1)The physical simulation experiment of steam flooding adopts a long core single tube model,with an inner diameter of 2.5 cm and a length of 50.0 cm. After sand filling, the porosity of the model is 35.0%,the permeability is 4 500 mD,and the steam dryness is 0.7. The steam injection temperature is 250℃,the steam injection rate is 6 mL/min,and the oil displacement efficiency can reach 82.52%.(2)The steam flooding process in the study area can be divided into four stages:start-up,stable flooding, steam breakthrough and steam denudation. The temperature field of the steam chamber between the injection and production horizontal wells is not balanced,the temperature at the bottom of the horizontal well expands rapidly, and the temperature at the top expands slowly. During the start-up and stable flooding stages,the temperature field presents a "triangular" advancing mode. The temperature field of the steam chamber expands along the diagonal in the steam breakthrough and denudation stages. The recovery percent in the steam flooding stage is 51.86%, the stable flooding stage is the main oil production stage,and the recovery percent is 39.06%.(3)Thermal viscosity reduction is the main mechanism of steam flooding in Lvda oilfield. The denudation of high-temperature steam, distillation effect,and the improvement of microscopic sweep efficiency also affect the oil displacement efficiency.

Key words: steam flooding, thermal viscosity reduction, steam denudation, physical simulation experiment, heavy oil reservoir, Neogene, Lvda oilfield, Bohai Sea

CLC Number: 

  • TE345
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