凝胶调剖剂在地层深部动态成胶性能评价  

Evaluation of the dynamic gelling performance for the gel profile-control agent in the deep stratum

作　　者：刘向斌[1] 尚宏志 LIU Xiangbin;SHANG Hongzhi(Oil Production Engineering Research Institute of Daqing Oilfield Co Ltd,Daqing 163453,China)

机构地区：[1]大庆油田有限责任公司采油工程研究院,黑龙江大庆163453

出　　处：《大庆石油地质与开发》2020年第1期86-90,共5页Petroleum Geology & Oilfield Development in Daqing

基　　金：国家科技重大专项“大庆长垣特高含水油田提高采收率示范工程”(2016ZX05054)。

摘　　要：凝胶调剖剂在地层深部"是否动态成胶"决定了深部调剖技术的可行性,关系到凝胶调剖技术是否真正有效和规模应用。为了解凝胶调剖剂地层深部封堵性能,建立了长岩心模型,形成了凝胶调剖剂长岩心动态成胶模拟评价方法,对凝胶调剖剂地层深部动态成胶特性进行了综合评价。凝胶取样评价实验表明,随着凝胶的连续注入,岩心沿程各点取样黏度逐步降低,模型注入前端黏度降低比例大,后端趋于平缓,成胶黏度随注入量的增加不断增强,多测点压力监测表明其压力变化趋势与静态黏度观察数据一致,岩心电镜扫描微观成胶形态评价实验表明凝胶在岩心孔隙中呈致密的宽网膜状分布,其动态成胶特征与取样黏度和压力观察结果一致。综合评价结果确定铬凝胶调剖体系可实现地层深部的有效封堵。The gel profile-control agent whether it gels or not dynamically in the deep stratum determines the feasibility of the deep profile-control technique, and moreover the technique is related to its truly effective and scale-size application. In order to understand the deep plugging performance of the gel profile-control agent, the corresponding long-core model was established, and the dynamic evaluation method for the gel formation was established, thus the dynamic gelling performance of the gel profile-control agent in the deep stratum was evaluated comprehensively. The gel sampling and evaluating experiments show that with the continuous injection of the gel, the viscosities of the samples decrease gradually at each point along the core, and the viscosity of the injection front of the model decreases seriously, while the viscosity of the rear end tends to be smooth, and the gelling viscosity increases with the rise of the injection volume. The multiple-point pressure monitoring shows that the pressure change trend is consistent with the static viscosity observed data. The evaluating experiment of the micro-gelling configuration by the core scanning electron microscope shows that the gel has the dense and broad net-membrane distributions in the core pores, and its dynamic gelling characteristics are consistent with the observed results of the sampling viscosity and pressure. The comprehensive evaluation results confirm that the chromium gel profile-control system can effectively block the deep strata.

关 键 词：长岩心 凝胶 调剖 黏度 动态成胶 微观成胶形态 封堵 压力 

分 类 号：TE357.46[石油与天然气工程—油气田开发工程]