稠油油藏蒸汽吞吐产能预测新模型

发布时间：2018-04-17 15:11

本文选题：稠油油藏 + 拟启动压力梯度　；参考：《特种油气藏》2017年03期

【摘要】：针对稠油非达西流动特征,引入稠油油藏有效动用理论,根据蒸汽吞吐开发时井筒周围流体的流动状态进行分区,采用等值渗流阻力法,考虑拟启动压力梯度,分别推导直井和水平井蒸汽吞吐开发方式下的产能预测公式。通过数值计算,分析生产压差、拟启动压力梯度、开发方式以及开发井型等因素对稠油油藏有效动用范围和产能的影响。分析结果认为:生产压差越大,油藏有效动用半径先增加,后趋于平缓,日产油量增加;拟启动压力梯度越大,有效动用半径逐渐变小,且递减幅度逐渐变缓,日产油量逐渐降低;拟启动压力梯度对天然能量和蒸汽吞吐开采的影响均不能忽略,且对蒸汽吞吐开采影响较大;直井和水平井产能均随拟启动压力梯度增加而减小,且水平井产能降低幅度较大。该研究为现场准确评估油井产能,选择合理开发方案提供了理论依据。
[Abstract]:In view of the non-Darcy flow characteristics of heavy oil, the effective production theory of heavy oil reservoir is introduced. According to the fluid flow state around the wellbore during steam huff and puff development, the equivalent percolation resistance method is adopted to consider the quasi-start-up pressure gradient.The productivity prediction formulas of vertical well and horizontal well under steam huff and puff development mode are derived respectively.Through numerical calculation, the effects of production pressure difference, quasi-start-up pressure gradient, development mode and development well type on the effective production range and productivity of heavy oil reservoir are analyzed.The results show that: the greater the pressure difference, the more the effective production radius of the reservoir increases first, then tends to flat, and the daily oil production increases, the larger the pressure gradient is, the smaller the effective production radius becomes, and the decreasing range becomes slower.The effect of quasi-start-up pressure gradient on natural energy and steam huff and puff production can not be ignored, and the productivity of vertical well and horizontal well decrease with the increase of pseudo start-up pressure gradient.The productivity of horizontal well is reduced greatly.The research provides a theoretical basis for the accurate evaluation of oil well productivity and the selection of reasonable development plan.
【作者单位】：北京科技大学;中国石化胜利油田分公司;山东省稠油开采技术省级重点实验室;
【基金】：国家自然科学基金“多孔介质中细观剩余油成因与流动动力学机制研究”(11372033) 中央高校基本科研业务费专项资金资助项目“薄层稠油油藏径向井压裂防砂裂缝延伸扩展规律研究”(FRF-TP-15-043A1)
【分类号】：TE345

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