摘要
铬微凝胶体系是由一定浓度的部分水解聚丙烯酰胺与铬交联剂主要通过分子间交联反应形成的一种三维网状结构的胶体[1],通过调整铬交联剂配位体数可以控制体系成胶时间,通过调整体系浓度可以控制成胶强度和深度,进而满足不同油层需要。其与聚合物交替调驱技术既利用铬微凝胶段塞改善吸水剖面、抑制聚合物突进或窜流,又利用了聚合物段塞驱替中、低渗透率油层的剩余油,并推动之前注入的铬微凝胶段塞向油层深部运移,避免了单次调剖对流度控制和剖面调整上的不足,达到边堵边流动的最佳驱替效果。在大庆油田萨南开发区现场应用结果表明,注入每一个铬微凝胶段塞后,注入剖面均得到改善,含水下降1个百分点以上,在每一个聚合物段塞,含水缓慢回升,回升速度得到有效控制,交替调驱增油降水效果明显。
Chromium micro gel system is a kind of three dimensional network structural gel which generated from cross-linking reaction among molecules of chrome cross-linking agent and partial hydrolyzing polyacrylamide. Gelling time can be controlled by adjusting ligandnumber of chrome cross-linking agent, while gelling intensity and depth can be controlled by adjusting system concentration, which can meet the demand of different reservoirs. The polymer flooding control technology not only improves the intake profile and restrains polymer breakthrough even polymer cross flow by chromium micro gel slug, but also displaces remaining oil in mid-low permeability oil layers by polymer slug. It also pushes forward the chromium micro gel slug into the deep reservoir, which avoids the weakness of mobility control by single profile control and achieves the best effect of blocking up meanwhile flowing. Field application in Sanan development area of Daqing Oilfield showed that after injecting chromium micro gel slug, the input profile was improved and water ratio was decreased by more than 1%. What’s more, water cut backed up so slowly that the speed of back-up was effectively controlled. Remarkable results of increasing oil and decreasing water have been given by profile control alternately.
出处
《石油科技论坛》
2012年第3期18-21,72,共4页
PETROLEUM SCIENCE AND TECHNOLOGY FORUM
基金
大庆油田有限责任公司局级项目"大庆油田南三区西部铬微凝胶调驱技术研究与现场应用"(编号:0803007)
关键词
铬微凝胶
交替调驱技术
聚丙烯酰胺
chromium micro gel
alternating flooding technology
polyacrylamide
