The water shutoff simulation experiment using tube for high-strength plugging agent in fractured reservoir

doi:10.7623/syxb201911007

Acta Petrolei Sinica ›› 2019, Vol. 40 ›› Issue (11): 1368-1375.DOI: 10.7623/syxb201911007

• Oil Field Development • Previous Articles Next Articles

The water shutoff simulation experiment using tube for high-strength plugging agent in fractured reservoir

Wu Qianhui, Ge Jijiang, Zhang Guicai, Guo Hongbin, Zhao Qingchen

School of Petroleum Engineering, China University of Petroleum, Shandong Qingdao 266580, China

Received:2019-03-26 Revised:2019-10-08 Online:2019-11-25 Published:2019-12-07

高强度堵水剂裂缝细管模型堵水模拟实验

吴千慧, 葛际江, 张贵才, 郭洪宾, 赵庆琛

中国石油大学(华东)石油工程学院山东青岛 266580

通讯作者: 葛际江,男,1972年6月生,1994年获石油大学(华东)学士学位,2002年获石油大学(华东)油气田开发工程专业博士学位,现为中国石油大学(华东)石油工程学院教授,主要从事油田化学方面的教学与科研工作。Email:gejijiang@163.com
作者简介:吴千慧,女,1992年8月生,2016年获常州大学学士学位,现为中国石油大学(华东)博士研究生,主要从事油田化学、提高采收率与采油化学方向的研究。Email:wuqh0803@163.com
基金资助:
国家科技重大专项"低丰度致密低渗油气藏开发关键技术"（2016ZX05048）资助。

Abstract

Abstract:

In the fractured tight reservoir, fractures are the channels for oil flow, and also water transfer after water flooding. Fractures may result in low sweep efficiency during water flooding, thus leading to ineffective exploitation. Moreover, the sealing of fractured reservoirs may cause many problems, such as poor sealing effect for large fractures and short-term durability. Aiming to solve those difficulties, two types of water-shutoff plugging systems have been developed:water-soluble phenol-formaldehyde resin gel and monomer polymerization breakthrough pressure plugging agent. On this basis, the authors determine the gelation performance, stability and strength of plugging agents at 70℃. Then the effects of various factors on the breakthrough pressure of water-shutoff agent have been studied by fracture simulation using a tube. The breakthrough direction of plugging agent and the influencing factors has been explored by experiments performed in a visible tube. The results show that the breakthrough pressure of water-soluble phenol-formaldehyde gel increases with the increasing of gel strength, and decreases with the increasing of tube diameter; it decreases first and then increases with the raising of water injection speed, and finally stabilizes. As for the monomer polymerization plugging agent, the breakthrough pressure increases with the increasing strength of plugging agent; it increases first and then decrease with the increasing of tube diameter. In the tube visualization experiments, the plugging agent did not break through only along the center of tube, which was related with the strength and adhesion of plugging agent.

Key words: fractured reservoir, high-strength plugging agent, elastic modulus, breakthrough pressure, visible tube

摘要：

在裂缝性致密储层中，裂缝既是油流通道又是水驱窜流通道，在注水开发中由于裂缝的存在导致水驱波及效率低，从而形成无效注水开发。此外，裂缝性储层的封堵又存在大裂缝封堵效果差、有效期短等问题。鉴于此研制了水溶性酚醛树脂冻胶和单体地层聚合高强度堵剂体系，测定了堵剂在70℃下的成胶性能、稳定性以及封堵强度等。通过细管模拟裂缝研究了不同因素对堵剂突破压力的影响；通过可视化细管研究了堵剂在管中的突破方式以及影响因素。研究结果表明，水溶性酚醛树脂冻胶的突破压力随着冻胶强度的增加而增加，随着管径的增加而减小，随着注水速度的增加先减小、后增加，最后稳定；单体地层聚合堵剂的突破压力随着堵剂强度的增加而增加，随着管径的增加先增大、后减小。在可视化细管实验中，堵剂突破时并不完全沿细管中心突破，其堵剂的强度与黏附性等因素有关。

关键词: 裂缝油藏, 高强度堵剂, 弹性模量, 突破压力, 可视化细管

CLC Number:

TE34

Wu Qianhui, Ge Jijiang, Zhang Guicai, Guo Hongbin, Zhao Qingchen. The water shutoff simulation experiment using tube for high-strength plugging agent in fractured reservoir[J]. Acta Petrolei Sinica, 2019, 40(11): 1368-1375.

吴千慧, 葛际江, 张贵才, 郭洪宾, 赵庆琛. 高强度堵水剂裂缝细管模型堵水模拟实验[J]. 石油学报, 2019, 40(11): 1368-1375.

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The water shutoff simulation experiment using tube for high-strength plugging agent in fractured reservoir

高强度堵水剂裂缝细管模型堵水模拟实验

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