摘要
针对高含酸气组分(H_2S和CO_2)的挥发油藏,基于热力学平衡理论和组分数值模型,利用模拟注气膨胀实验、最小混相压力计算、模拟多级接触实验和模拟细管实验,研究了回注溶解气的混相方式、混相压力和混相过程以及酸气组分对混相的作用机制。以目标区块为例的研究结果表明:回注溶解气混相方式为蒸发和凝析并存,且凝析混相机理占主导地位;原油中的酸气组分能够降低最小混相压力,增强凝析式混相作用,其中H_2S的作用效果强于CO_2;在蒸发和凝析并存的动态混相过程中,尤其在向前接触段酸气组分有利于减少接触次数,降低混相难度;另外,酸气组分还有助于降低气油流度比,改善注气效果。
In volatile oil reservoir with rich acid gas （H2S and C02）, based on the thermodynamic equilibrium theory and the compo- sitional model, and by simulating the swelling test, calculating the minimum miscibility pressure, simulating the multiple contact experiment and simulating the slim-tube experiment, the miscibility pattern, miscibility pressure and miscibility process of the re- cycle dissolved gas and the action mechanism of the acid gas on the miscible phase were studied. The research results of the target area show that the evaporation and the miscible method of the recycle dissolved gas is the evaporation and the condensation exist to- gether, while the condensation plays a primary role. The acid gas in crude oil, H^S especially, can help decrease the minimum mis- cible pressure and enhance the evaporation effects, making the multiple contacts more efficient, especially in evaporation part, and reducing the gas-oil mobility ratio. In addition, the acid gas can help reduce gas to oil mobility ratio and improve the gas flooding performance.
出处
《油气藏评价与开发》
CSCD
2017年第2期41-46,共6页
Petroleum Reservoir Evaluation and Development
基金
中国石油天然气集团公司重大科技专项"中国石油海外油气上产2亿吨开发关键技术研究"(2011E-2504)
关键词
挥发油藏
酸气
溶解气回注
蒸发
凝析
混相机理
volatile oil reservoir, acid gas, recycle dissolved gas, evaporation, condensation, miscible mechanism
