改性硅酮CO_(2)增稠剂对流体流变性和驱油效率的影响  

Effect of Modified Silicone CO_(2) Thickener on Fluid Rheology and Oil Displacement Efficiency

作　　者：眭世元 肖朴夫 崔茂蕾[2,3] SUI Shiyuan;XIAO Pufu;CUI Maolei(Petroleum Engineering Technology Research Institute,Sinopec,Beijing 102206,P R of China;Petroleum Exploration and Development Research Institute,Sinopec,Beijing 102206,P R of China;State Key Laboratory of Shale Oil and Gas Enrichment Mechanism and Effective Development,Beijing 102206,P R of China)

机构地区：[1]中国石化石油工程技术研究院,北京102206 [2]中国石化石油勘探开发研究院,北京102206 [3]页岩油气富集机理与有效开发国家重点实验室,北京102206

出　　处：《油田化学》2023年第2期229-234,共6页Oilfield Chemistry

基　　金：国家科技重大专项“陆相页岩油流动机理及开采关键技术研究”(项目编号2017ZX05049003)。

摘　　要：在压裂过程中,液态CO_(2)压裂液的压裂性能发生了很大的变化。为了改善CO_(2)压裂效果,提高CO_(2)对页岩中原油的置换效率,提出合成硅酮CO_(2)增稠剂的新思路:通过开环聚合和硅氢化反应,将亲CO_(2)短链引入聚合物主链分子间,形成空间网状结构。研究了CO_(2)增稠剂对流体黏度、流变特性和驱油效率的影响。结果表明,增稠剂加量和相对分子质量均能显著改善CO_(2)流体的流变性,其稠度系数随增稠剂加量的增加而增大,而流变性指数呈下降趋势。当体系压力超过12 MPa后,三维网状结构的稳定性加强,表观黏度增加。相比超临界CO_(2)驱,增稠CO_(2)流体能提高0.01μm以上孔隙中原油的动用效率,提高驱油效率12.23百分点。研究结果为改进CO_(2)压裂工艺和CO_(2)增稠剂的分子设计提供了技术参考。During fracturing,the fracturing performance of liquid CO_(2) fracturing fluid has changed greatly.In order to improve the effect of CO_(2) fracturing and the displacement efficiency of CO_(2) to shale crude oil,a new idea of synthesizing silicone CO_(2) thickener was put forward.Through ring-opening polymerization and hydrosilylation reaction,CO_(2)-friendly short chain was introduced into the intermolecular of polymer main chain.As a result,a spatial network structure formed.The effects of CO_(2) thickener on fluid viscosity,rheological properties and oil displacement efficiency were studied.The results showed that both the dosage and the relative molecular mass of thickener could significantly improve the rheology of CO_(2) fluid.Its consistency coefficient increased with increasing amount of thickener,while the rheological index showed a downward trend.When the system pressure exceeded 12 MPa,the stability of three-dimensional network structure was strengthened and the apparent viscosity increased.Compared with supercritical CO_(2) flooding,thickened CO_(2) fluid could improve the production efficiency of crude oil in pores above 0.01μm.Furthermore,the oil displacement efficiency was increased by 12.23 percentage points.The research results provided technical reference for improving CO_(2) fracturing technology and molecular design of CO_(2) thickener.

关 键 词：页岩油 二氧化碳增稠剂 超临界二氧化碳 压裂液 

分 类 号：TE357[石油与天然气工程—油气田开发工程]