九_4区齐古组稠油油藏开发中原油物性变化规律

The Crude Oil Property Change in Process of Development of Qigu Heavy Oil Reservoir in District No.9(4) in Junggar Basin

克拉玛依油田九4区齐古组油藏的原油性质具有黏度高、酸值高、胶质含量高、含蜡量低、凝固点低、含硫量低、沥青质含量低、黏温敏感等特点。随着九1—九5区稠油油藏开发程度的不断加深,在不同开采阶段,油藏地下原油性质发生了较大程度的变化,如密度增大、凝固点升高、胶质和沥青质相对含量增大、完全脱气(溶解气油比降低)、黏度增大等等,这些都直接影响地下流体多相流动的渗流规律,从而最终影响稠油油藏的采出程度。

The Qigu reservoir of District No. 9（4） is characterized by high viscosity, high acid value, high colloid content, low wax, low freezing point, low sulfur, low asphahene content and sensitive viscosity-temperature relationship. With the continuous extension of areas of the heavy oil reservoir development and the deepening of degree of development in District No. 9 （1-5）, the property of in-situ crude oil has changed to a greater degree in different recovery stages. For instance, the oil viscosity, density, freezing point, colloid and asphaltene relative contents are all higher, and solution gas-oil ratio is lower. These could directly influence the percolation nature of in-situ muhiphase flows, hence finally impact the recovery percent of the heavy oil reservoir in this area.