冷43块氮气泡沫驱油技术研究

发布时间：2018-04-15 22:23

  本文选题：氮气 + 泡沫驱油　； 参考：《东北石油大学》2017年硕士论文

【摘要】：随着油田开发程度的加深,氮气以及扩展发散的氮气泡沫这类型气体采油技术需要进一步深入研究,来满足当前世界范围油藏的开发难题。以冷43块地质特征为研究前提,在微观(可视)模型上进行微观驱油实验,用图象分析的方法来研究氮气泡沫的微观驱油机理,开展了注入速度、气液比和润湿性对微观驱替效果的影响研究。同时开展了高温起泡剂的筛选和在三维岩心模型物理模拟实验。结果表明,泡沫驱油的主要机理分为扩大微观波及体积、增加宏观扫油面积和提高驱油效率三个部分,较高的注入速度和一定范围内的高气液比有利于提高氮气泡沫驱的驱油效率,而润湿性对泡沫的生成及稳定性影响很小,对氮气泡沫驱最终结果影响不大。在高温起泡剂的筛选和在三维岩心模型物理模拟实验中,筛选并研制了EOR-CL/LH-XⅢ重烷基苯磺酸盐高效起泡剂,并且在驱油过程中,起泡剂的合理浓度在0.5%~0.6%,最佳气液比1:1的条件下能产生稳定的微小泡沫,最大限度地使后续驱替流体转向,起到明显的调剖作用,在高压下泡沫的产生和稳定要相对常压下困难,但依然具备调剖能力。在热水+氮气泡沫驱过程中比单纯氮气泡沫驱提高采收率幅度更高。通过室内物理模拟实验结果以及前期调研,对氮气泡沫采油工艺进行设计,认为氮气隔热、氮气助排工艺针对的是注蒸汽开发的稠油油藏;氮气泡沫调剖工艺既可应用在稀油油藏中也可应用在稠油油藏中的注水开发时发生注水窜流阶段;氮气泡沫吞吐工艺可缓解稀油油藏产油量的递减;氮气排水诱喷则是新老气井的有效增产工艺措施。同时,针对目前冷43块出现的情况进行地质情况分析,通过数值的模拟,从地质条件上分析目前整体区块的剩余油情况,根据情况,选定了其中一口井作为注入井,并研究分析制定工艺方案,从泡沫剂的注入方式、发泡时间、段塞的大小、注入速度等角度来研究制定最佳的工艺变量。现场试验证明氮气泡沫确实是一种行之有效的气体采油技术,通过氮气泡沫的注入形成段塞,对大通道进行封堵,从而有利于剩余油的开采。这种方法对开发后期的,地层能量显著下降,并且含水高期,地下有大通道这种情况能够给予极其有效的解决。
[Abstract]:With the deepening of oilfield development, nitrogen gas and the extended and divergent nitrogen foam gas recovery technology need to be further studied in order to meet the current worldwide reservoir development problems.Based on the geological characteristics of Leng 43 block, the microscopic oil displacement experiment was carried out on the microscopic (visual) model. The microscopic oil displacement mechanism of nitrogen foam was studied by image analysis method, and the injection rate was carried out.The effect of gas-liquid ratio and wettability on micro-displacement effect was studied.At the same time, the screening of high temperature foaming agent and the physical simulation experiment of three-dimensional core model were carried out.The results show that the main mechanism of foam flooding is divided into three parts: enlarging microcosmic sweep volume, increasing macroscopic sweep area and improving oil displacement efficiency.Higher injection rate and higher gas-liquid ratio can improve the oil displacement efficiency of nitrogen foam flooding, but wettability has little effect on the formation and stability of foam, but has little effect on the final result of nitrogen foam flooding.In the screening of high temperature foaming agent and the physical simulation experiment of 3D core model, the high efficiency foaming agent of EOR-CL/LH-X 鈪，

本文编号：1756065