【作者】 王勇；

【导师】 李兆敏；

【作者基本信息】 中国石油大学 ， 油气田开发工程， 2010， 硕士

【摘要】 辽河中深层超稠油蒸汽吞吐后期转SAGD技术经过10年的科研攻关,先导试验于2005年取得成功,已进入工业化推广阶段。辽河油田杜84块馆陶油层属于巨厚型顶水油藏,在SAGD过程中,随着蒸汽腔在纵向上的扩展,顶水下方沥青壳逐渐软化,最终造成顶水突破,蒸汽腔坍塌后SAGD阶段结束。深入研究能够改善蒸汽腔扩展和延长SAGD阶段时间的措施,对SAGD中后期改善开发效果及提高采收率具有重要意义。论文从辽河超稠油性质出发,进行了烟道气在超稠油中的溶解特性实验,实验结果表明烟道气在超稠油中的溶解度随压力的增大而增大,超稠油饱和压力下体积系数随溶解烟道气量的增大而增大,对应的密度随溶解烟道气量的增大而减小;在实验温度范围内,烟道气在超稠油中溶解度较小,体积系数较小;实验温度范围内烟道气溶解于超稠油后,油气混合物粘度有较大幅度下降,降粘率基本呈线性增加。针对超稠油基本参数及注入烟道气膨胀实验对实验数据进行了流体相态拟合,为数值模拟提供了可信的参数。根据杜84块馆陶油层油藏地质特征、多组分流体相态拟合生成的流体组分数据,结合SAGD数值模拟技术,建立了烟道气辅助SAGD数值模拟模型。针对常规SAGD技术,进行了不改变注汽方式的开发效果预测,对注入井(蒸汽)轮注可行性进行了分析。针对烟道气辅助SAGD技术,进行了烟道气/蒸汽伴注可行性分析,对蒸汽/烟道气注入比和注入总量进行了优选,对注入井(蒸汽/烟道气)轮注可行性进行了分析。常规SAGD和烟道气辅助SAGD数值模拟结果表明注入井(蒸汽或蒸汽/烟道气)轮注对于改善SAGD过程中蒸汽腔的扩展及延长SAGD阶段时间效果明显。随着辽河油田SAGD规模的不断扩大,烟道气辅助SAGD开发的应用前景广阔。更多还原

【Abstract】 After 10 years’scientific research, pilot project of SAGD(steam assisted gravity drainage) technique transferred from later stage of huff and puff technique achieved success in 2005, both of the two techniques mentioned above are being used for developing semi-deep and deep ultra-heavy oil in Liaohe Oilfield. Now SAGD technique is experiencing popularization stage into industrialization. There is huge top water in Guangtao Formation, Du84 Block in Liaohe Oilfield. As steam chamber rises in vertical direction during the process of SAGD, the heat of steam will soften bitumen shell under top water. Finally, top water will intrude into the steam chamber, which leads to the collapse of steam chamber and failure of SAGD. Research on methods, which can improve the condition of steam chamber and prolong the lifetime of SAGD is quite necessary for IOR in wind-down process of SAGD.Solubility of flue gas in ultra-heavy oil is researched by laboratory experiment. The results indicate that solubility of flue gas improves along with pressure, volume factor at saturation pressure improves and density of mixture decreases along with solubility of flue gas. At the range of experiment temperatures, solubility of flue gas in ultra-heavy oil and volume factor are both quite small. After soluble of flue gas, viscosity of ultra-heavy oil decreases, and viscosity reducing ratio is nearly linearly improved. According to basic parameters of ultra-heavy oil and results of swelling test, fluid phase behavior was matched, which can provide believable parameters for simulation. The simulation model of flue gas assisted SAGD was created according to the basic geological data, property data of compositions, and conventional SAGD simulation model. For conventional SAGD technique, development effectiveness of former development manner was forecasted, feasibility of steam or steam/flue gas injector alternative injection is analyzed. For flue gas assisted SAGD technique, feasibility of steam/flue gas co-injection was analysed, steam/flue gas ratio and total amount were optimized. Simulation results indicate alternative injection is useful in improving expand condition of steam chamber and prolonging lifetime of SAGD. With the popularization of SAGD, flue gas assisted SAGD has a very bright future in application.更多还原