自生长水凝胶粒子特性及裂缝调控作用机理

doi:10.7623/syxb202206008

石油学报 ›› 2022, Vol. 43 ›› Issue (6): 840-848.DOI: 10.7623/syxb202206008

自生长水凝胶粒子特性及裂缝调控作用机理

戴彩丽, 刘佳伟, 李琳, 刘逸飞, 徐忠正, 孙宁, 丁飞, 孙永鹏

中国石油大学(华东)山东省油田化学重点实验室/非常规油气开发教育部重点实验室山东青岛 266580

收稿日期:2020-12-11 修回日期:2021-12-28 发布日期:2022-06-28
通讯作者: 戴彩丽,女,1971年3月生,2006年获中国石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事提高采收率与采油化学的研究与应用工作。
作者简介:戴彩丽,女,1971年3月生,2006年获中国石油大学(华东)博士学位,现为中国石油大学(华东)石油工程学院教授、博士生导师,主要从事提高采收率与采油化学的研究与应用工作。Email:daicl@upc.edu.cn
基金资助:
国家重点研发计划项目(2019YFA0708700)、国家自然科学基金项目(No.52174054)和中国博士后基金项目(2020M682264)资助。第一作者及

Characteristics and action mechanism of self-growing hydrogel particle fracture control system

Dai Caili, Liu Jiawei, Li Lin, Liu Yifei, Xu Zhongzheng, Sun Ning, Ding Fei, Sun Yongpeng

Shandong Key Laboratory of Oilfield Chemistry/Key Laboratory of Unconventional Oil and Gas Development, China University of Petroleum, Shandong Qingdao 266580, China

Received:2020-12-11 Revised:2021-12-28 Published:2022-06-28

摘要/Abstract

摘要： 裂缝调控在低渗透/特低渗透油藏开发中能够有效提高裂缝周边基质原油的波及范围,为了实现"注得进、走得远、耐得住、长效适度调控",研发了自生长水凝胶粒子体系。基于贻贝仿生理念,引入类儿茶酚结构合成仿生功能聚合物,并与酚醛树脂交联制备本体水凝胶,其流变剪切弹性模量为5.5~5.6 Pa,高剪切应变破坏后弹性模量恢复率超过98%。粒径分布与扫描电镜分析结果表明,仿生功能聚合物制备的水凝胶粒子在模拟储层条件老化后能聚集自生长,中值粒径增大10~15倍,呈现出三维体型结构。通过建立原子力显微镜胶体探针纳米力学测量方法,定量表征水凝胶粒子间的作用力,粒子间静电斥力是自生长水凝胶粒子稳定分散的主要原因,随着液相矿化度升高静电力逐渐被屏蔽,粒子间的多重超分子引力占据主导,揭示了粒子间聚集生长的界面纳米力学机理。通过物理模拟结合扫描电镜实验探究了水凝胶粒子体系的注入性、流度调控效果及提高采收率潜力。结果表明,自生长水凝胶粒子体系易注入,远运移,在裂缝内粒子间能黏聚,与壁面黏附,在二次水驱中表现出更好的调控效果与更持久的耐冲刷能力,能有效动用裂缝周边基质的原油。

关键词: 水凝胶粒子, 裂缝调控, 自生长, 纳米力学, 界面作用

Abstract: Fracture control can effectively improve the spread of matrix crude oil around the fractures in the development of low-permeability/ultra-low-permeability reservoirs. In this study, a self-growing hydrogel particle system was developed to achieve the "injectability, long-distance migration, durability and long-lasting moderate control". Based on the mussel bionic concept, a bionic functional polymer was synthesized by introducing a catechol-like structure, and then cross-linked with phenolic resin to produce the bulk hydrogel with a rheological shear elastic modulus of 5.5-5.6 Pa and an elastic modulus recovery rate of over 98%. The particle size distribution and SEM results show that the hydrogel particles prepared from the bionic functional polymer can agglomerate and self-grow after aging in simulated reservoir conditions, and the particle size can increase about 10-15 times, showing a three-dimensional bulk structure. The colloidal probe modification technique based on atomic force microscopy was established to quantitatively characterize the inter-particle forces of hydrogels by nanomechanical measures. Inter-particle electrostatic repulsion is the main reason for the stability of self-growing hydrogel particles during the storage and injection periods. The electrostatic forces are gradually shielded with the increasing of mineralization degree, and the supramolecular forces between particles play a dominant role. This explains the nanomechanical mechanism of inter-particle aggregation growth. The injection, control and enhanced recovery performance of the hydrogel particle system were investigated by physical simulations and scanning electron microscopy experiments. The results show that the self-growing hydrogel particle system has the characteristics of easy injection, far transport and cohesive growth in fractures, showing longer-lasting flushing resistance and better control in secondary water flooding, and can effectively mobilize the crude oil in the matrix around the fractures.

Key words: hydrogel particles, fracture conformance control, self-growth, nanomechanics, interface interaction

中图分类号:

TE357.46

戴彩丽, 刘佳伟, 李琳, 刘逸飞, 徐忠正, 孙宁, 丁飞, 孙永鹏. 自生长水凝胶粒子特性及裂缝调控作用机理[J]. 石油学报, 2022, 43(6): 840-848.

Dai Caili, Liu Jiawei, Li Lin, Liu Yifei, Xu Zhongzheng, Sun Ning, Ding Fei, Sun Yongpeng. Characteristics and action mechanism of self-growing hydrogel particle fracture control system[J]. Acta Petrolei Sinica, 2022, 43(6): 840-848.

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自生长水凝胶粒子特性及裂缝调控作用机理

Characteristics and action mechanism of self-growing hydrogel particle fracture control system

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