中国石油大学学报（自然科学版）2016，Vol.40Issue(5)：104-111,8.DOI:10.3969/j.issn.1673-5005.2016.05.012
注聚驱防砂井挡砂介质物理化学复合堵塞机制试验
Experimental study on mechanical and chemical combined plugging mechanism of sand control media in heavy oil reservoirs with polymer flooding
摘要
Abstract
During polymer flooding of heavy oil reservoirs in Gudong Oilfield, the well productivity decreased greatly in the early production stage after sand control measures were applied. It was observed that it is much more difficult for wells with wire-wrapped screen gravel-pack for sand control to achieve better performance than wells with resin-coated screen stand-alone method, which is inconsistent to the usual practice. In this study, series of experiments were firstly conducted to reveal the mechanisms of sand invading and plugging in the gravel packs. The influence of gravel-sand ratio ( GSR) , clay content, fluid viscosity, flow rate and production time on plugging rate in the presence of heavy oil and polymer were investigated. In order to investigate the chemical plugging mechanisms, the effects of wettability, asphaltene adsorption, polymer adsorption on clean quartz gravel and resin-coated gravel were then tested and analyzed. Based on the experiment results, a combined mechanical and chemical plugging mechanism was proposed to explain to the cumulated plugging phenomenon during polymer flooding. The experimental results indicated that, for the gravel packs with clean sands, mechanical plugging of the sand retention media takes place in the early stage of the production, and high GSR, fluid viscosity, clay content, production rate and polymer con-tent tend to increase the plugging rate. In comparison with the resin-coated gravels, the clean quartz sand gravel is of higher water wettability and has high capacity to adsorb asphaltene and polymers, which was also verified by adsorption testing at dif-ferent conditions. The polymer adsorption on the gravel surface increases with the polymer concentration and small gravel size. It is concluded that, during polymer flooding of heavy oil reservoirs, the reason for the permeability reduction of the clean sand packed gravel can be attributed the chemical plugging induced by polymer and heavy oil components.关键词
挡砂介质/复合堵塞机制/砾石充填/沥青质吸附/聚合物吸附/聚合物驱/孤东油田Key words
sand retention media/combined plugging mechanism/gravel pack/asphaltene adsorption/polymer adsorption/polymer flooding/Gudong Oilfield分类
能源科技引用本文复制引用
董长银,高凯歌,王静,智勤功,高聚同,张清华..注聚驱防砂井挡砂介质物理化学复合堵塞机制试验[J].中国石油大学学报（自然科学版）,2016,40(5):104-111,8.基金项目
国家自然科学基金项目(51374226) （51374226）
