西南石油大学学报(自然科学版)

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A Study on Temperature Effect of Water Displacement Efficiency in High#br# Pour Point Oil Reservoir

XU Feng1,2*, WU Xianghong2, MA Kai2, FENG Min2, TIAN Xiao2   

  1. 1. School of Earth and Space Sciences,Peking University,Haidian,Beijing 100871,China
    2. Research Institute of Petroleum Exploration & Development,PetroChina,Haidian,Beijing 100083,China
  • Online:2016-02-01 Published:2016-02-01

Abstract:

Temperature has a great effect on the rheological property of high pour point oil because of its high wax content and
high pour point. During the development of high pour point oil reservoir,wax precipitation easily occurs in the conventional
water flooding process,leading to low efficiency of water flooding,which has direct impacts on the development performances.
A series of laboratory experiments are conducted under circumstances where temperatures of injected water are different to
study the influence of temperature on the water displacement efficiency in the P high pour point oil reservoir,South Sudan.
The experiments include:one-dimensional long core live oil experiment,one-dimensional long core degassed oil experiment
and one-dimensional short core degassed oil experiment. In addition,a 3D four-phase pseudo-component model is established.
Wax precipitation is designed in the simulation model,and all the key factors are considered in the high pour point oil reservoir
simulation,making the predicting results more accurate. Laboratory investigation and numerical simulation results show that
the temperature has great impacts on the water displacement efficiency before the wax appearance temperature (WAT). When
the temperature is higher than WAT,oil viscosity is less sensitive to temperature with the temperature increasing,and the rate
of increased oil displacement efficiency decreases. So it is suggested that water temperature should be higher than WAT.

Key words: high pour point reservoir, injection temperature, water displacement efficiency, laboratory investigation, numerical
simulation

CLC Number: