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可脱离式充填筛管用降解剂的研制及降解机制
齐宁,刘帅,李柏杨,方明君,田壮壮
0
(中国石油大学石油工程学院,山东青岛 266580)
摘要:
研制一种新型的油田防砂用可脱离式充填筛管,其技术关键是实现井下PLA-T管体的快速有效脱离。以PLA-T的降解程度和降解速率为评价指标优选出一种降解剂配方,并在模拟油藏条件下对降解剂进行耐温、耐盐、耐稀释等性能的评价。通过扫描电镜观察反应过程中PLA-T表面的微观变化,分析PLA-T的降解机制。结果表明:最优降解剂配方为w(丙酮)∶w(二甲基甲酰胺)∶w(乙二胺)=3∶2∶5;在温度为50~80 ℃、矿化度为10~100 g/L、稀释质量分数为70%~90%的模拟油藏条件下,PLA-T管体降解时间为6~92 min,表明该体系在复杂环境中具有优良的降解性能;在降解剂的作用下,PLA-T的表面结构形态从光滑表面逐步向裂纹、裂缝、不规则裂缝、裂缝-孔洞形态转变,导致PLA-T的降解速率先增大后减小;这种高效降解剂可以通过对PLA-T管体快速降解,实现井下充填筛管的有效脱离,达到疏松砂岩油气藏无筛管防砂的目的。
关键词:  可脱离式充填筛管  降解剂  降解程度  降解速率  无筛管防砂
DOI:10.3969/j.issn.1673-5005.2016.06.011
投稿时间:2016-05-23
基金项目:国家自然科学青年基金项目(51204199)
Design and performance of degradation agent for detachable filling screen tubes in oilfield sand control
QI Ning,LIU Shuai,LI Boyang,FANG Mingjun,TIAN Zhuangzhuang
(School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China)
Abstract:
A novel detachable filling screen tube was developed for oilfield sand control. The key to this technology is to detach the PLA-T tube quickly and effectively downhole. In this study, an efficient degradation agent of PLA-T was proposed and its performance was evaluated under various oilfield conditions. Microscopic changes of the PLA-T surface structure were observed by SEM to analyze the degradation mechanism. The experimental results show that an optimized formula of the agent consists of w(acetone)∶w(DMF)∶w(ethylenediamine)=3∶2∶5. Under simulated reservoir conditions with temperature of 50-80 ℃, salinity of 10-100 g/L and diluted mass fraction of 70%-90%, the degradation time of the PLA-T tube is 6-92 min, which indicates that the agent has a good degradation performance in rigorous environments. The SEM results reveal that the surface of the PLA-T can be gradually transformed from smooth to cracks, and then successively to crevices, irregular crevices and crevice-holes induced by the degradation agent, which leads to the degradation rate of the PLA-T increasing firstly and then decreasing. This degradation agent can dissolve the PLA-T tube downhole so that the filling screen tube can be quickly and effectively detached, therefore screenless sand control can be applied in unconsolidated sandstone reservoirs.
Key words:  detachable filling screen tube  degradation agent  degradation degree  degradation rate  screenless sand control