本文選題：氮氣 + 泡沫驅(qū)油　； 參考：《東北石油大學(xué)》2017年碩士論文

【摘要】：隨著油田開發(fā)程度的加深,氮氣以及擴展發(fā)散的氮氣泡沫這類型氣體采油技術(shù)需要進一步深入研究,來滿足當(dāng)前世界范圍油藏的開發(fā)難題。以冷43塊地質(zhì)特征為研究前提,在微觀(可視)模型上進行微觀驅(qū)油實驗,用圖象分析的方法來研究氮氣泡沫的微觀驅(qū)油機理,開展了注入速度、氣液比和潤濕性對微觀驅(qū)替效果的影響研究。同時開展了高溫起泡劑的篩選和在三維巖心模型物理模擬實驗。結(jié)果表明,泡沫驅(qū)油的主要機理分為擴大微觀波及體積、增加宏觀掃油面積和提高驅(qū)油效率三個部分,較高的注入速度和一定范圍內(nèi)的高氣液比有利于提高氮氣泡沫驅(qū)的驅(qū)油效率,而潤濕性對泡沫的生成及穩(wěn)定性影響很小,對氮氣泡沫驅(qū)最終結(jié)果影響不大。在高溫起泡劑的篩選和在三維巖心模型物理模擬實驗中,篩選并研制了EOR-CL/LH-XⅢ重烷基苯磺酸鹽高效起泡劑,并且在驅(qū)油過程中,起泡劑的合理濃度在0.5%~0.6%,最佳氣液比1:1的條件下能產(chǎn)生穩(wěn)定的微小泡沫,最大限度地使后續(xù)驅(qū)替流體轉(zhuǎn)向,起到明顯的調(diào)剖作用,在高壓下泡沫的產(chǎn)生和穩(wěn)定要相對常壓下困難,但依然具備調(diào)剖能力。在熱水+氮氣泡沫驅(qū)過程中比單純氮氣泡沫驅(qū)提高采收率幅度更高。通過室內(nèi)物理模擬實驗結(jié)果以及前期調(diào)研,對氮氣泡沫采油工藝進行設(shè)計,認為氮氣隔熱、氮氣助排工藝針對的是注蒸汽開發(fā)的稠油油藏;氮氣泡沫調(diào)剖工藝既可應(yīng)用在稀油油藏中也可應(yīng)用在稠油油藏中的注水開發(fā)時發(fā)生注水竄流階段;氮氣泡沫吞吐工藝可緩解稀油油藏產(chǎn)油量的遞減;氮氣排水誘噴則是新老氣井的有效增產(chǎn)工藝措施。同時,針對目前冷43塊出現(xiàn)的情況進行地質(zhì)情況分析,通過數(shù)值的模擬,從地質(zhì)條件上分析目前整體區(qū)塊的剩余油情況,根據(jù)情況,選定了其中一口井作為注入井,并研究分析制定工藝方案,從泡沫劑的注入方式、發(fā)泡時間、段塞的大小、注入速度等角度來研究制定最佳的工藝變量�，F(xiàn)場試驗證明氮氣泡沫確實是一種行之有效的氣體采油技術(shù),通過氮氣泡沫的注入形成段塞,對大通道進行封堵,從而有利于剩余油的開采。這種方法對開發(fā)后期的,地層能量顯著下降,并且含水高期,地下有大通道這種情況能夠給予極其有效的解決。
[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，

本文編號：1756065