Formation and migration laws of nanofiber-based high-stability foam in fractures

doi:10.7623/syxb202009010

Acta Petrolei Sinica ›› 2020, Vol. 41 ›› Issue (9): 1135-1145.DOI: 10.7623/syxb202009010

• Oil Field Development • Previous Articles Next Articles

Formation and migration laws of nanofiber-based high-stability foam in fractures

Wei Bing¹, Chen Shengen¹, Zhao Jinzhou¹, Pu Wanfen¹, Wei Falin², Xiang Hua², Kadet Valeriy³

1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Sichuan Chengdu 610500, China;
2. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;
3. Gubkin Russian State University of Oil and Gas, Moscow 119991, Russia

Received:2020-02-23 Revised:2020-07-16 Online:2020-09-25 Published:2020-09-29

纳米纤维高稳泡沫在裂缝中的生成和运移规律

魏兵¹, 陈神根¹, 赵金洲¹, 蒲万芬¹, 魏发林², 相华², Kadet Valeriy³

1. 西南石油大学油气藏地质及开发工程国家重点实验室四川成都 610500;
2. 中国石油勘探开发研究院北京 100083;
3. 古勃金国立石油与天然气大学莫斯科 119991

通讯作者: 魏兵,男,1983年8月生,2006年获曲阜师范大学化学工程专业学士学位,2013年获加拿大新不伦瑞克大学化学工程专业博士学位,现为西南石油大学教授、博士生导师,主要从事非常规油藏提高采收率技术和理论研究。
作者简介:魏兵,男,1983年8月生,2006年获曲阜师范大学化学工程专业学士学位,2013年获加拿大新不伦瑞克大学化学工程专业博士学位,现为西南石油大学教授、博士生导师,主要从事非常规油藏提高采收率技术和理论研究。Email:bwei@swpu.edu.cn
基金资助:
国家重点基础发展计划（973）项目"陆相致密油高效开发基础研究"（2015CB250900）和国家自然科学基金面上项目"基于纤丝纳米材料（CNF）高稳泡沫驱体系的构筑及液膜夹断-分离行为研究"（No.51974265）资助。

Abstract

Abstract:

Fracture crossflow in horizontal wells (around well/cross-well)of tight oil reservoirs leads to the imbalance of energy complement in the middle and late stages of exploitation,which is even impossible to be supplemented. A nanofiber (NCF)-based high-stability foam system was designed and developed in the experiment,and the macro/micro properties of the high-stability foam were systematically studied. Using the fracture model constructed in the laboratory,a study was performed on the formation and migration laws of high-stability foam in the fracture. The foaming solution is highly dispersed in 4.2 % salt water and has good compatibility with formation water. NCF can effectively inhibit the dehydration of foam films,slow down the foam instability process,and increase the foam half-life by 4.5 times. High-stability foam can be formed rapidly in fractures and rapidly migrates to the deep parts of fractures,thereby reducing the percolation ability of fractures and preventing gas channeling. The high-stability foam with the gas-liquid ratio of 2∶1 produces the largest flow resistance. The smaller the fracture opening,the faster the foam generation speed; the higher the flow resistance,the wider the area with high percolation resistance. The flow resistance of high-stability foam in fractures and the fracture permeability show a good linear relationship. Based on the flow characteristics of NCF high-stability foam in fractures,this study establishes a chart of the relationship between foam flow resistance and gas-liquid line velocity.

Key words: tight reservoir, fracture control, high-stability foam, foam formation and migration, prevention of gas channeling

摘要：

致密油藏水平井（井周/井间）裂缝窜流导致开发中、后期能量补充不"均衡"甚至无法补充。通过实验设计研发了基于纳米纤维（NCF）的高稳泡沫体系，并系统研究了高稳泡沫的宏观/微观性质；通过实验室构建的裂缝模型，研究了高稳泡沫在裂缝中的生成和运移规律。研究结果表明，起泡液在质量分数为4.2%的盐水中高度分散，与地层水配伍性好，NCF可以有效抑制泡沫液膜脱水，减缓泡沫失稳过程，泡沫半衰期提高4.5倍；高稳泡沫可以在裂缝中快速生成然后运移至裂缝深部，从而降低裂缝的渗流能力，防止气窜，气液比为2∶1的高稳泡沫产生的流动阻力最大；裂缝开度越小，泡沫生成的速度越快，流动阻力越高，产生高渗流阻力的区域越宽；高稳泡沫在裂缝中的流动阻力和裂缝渗透率呈现良好的线性关系。基于NCF高稳泡沫在裂缝中的流动特征，进一步构建了泡沫流动阻力与气液线速度关系图版。

关键词: 致密油藏, 裂缝控制, 高稳泡沫, 泡沫生成运移, 防止气窜

CLC Number:

TE357

Wei Bing, Chen Shengen, Zhao Jinzhou, Pu Wanfen, Wei Falin, Xiang Hua, Kadet Valeriy. Formation and migration laws of nanofiber-based high-stability foam in fractures[J]. Acta Petrolei Sinica, 2020, 41(9): 1135-1145.

魏兵, 陈神根, 赵金洲, 蒲万芬, 魏发林, 相华, Kadet Valeriy. 纳米纤维高稳泡沫在裂缝中的生成和运移规律[J]. 石油学报, 2020, 41(9): 1135-1145.

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Formation and migration laws of nanofiber-based high-stability foam in fractures

纳米纤维高稳泡沫在裂缝中的生成和运移规律

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