Research On Chemical Plugging Technology For High Permeable Zones In Thich Layers

The main pay layers in Daqing oilfield are thick and seriously non-homogenous. Consequently the high permeable zones forms in the thich layers due to long term water flooding development, which results in the problem of low-efficient water-recycling. At present, it's a effective method to plug the high permeable zones with chemical agents.To meet the need for plugging, a systemic investigation on the up-to-date advances of water plugging and profile adjustment technology was carried out, based on which the diverting mechanism of fluid flow and distorting particles flow inside the layers was studied. After working on mechanism research and using the physical simulation models of one, two, three-dimension, the mechanism of fluid flow diverting inside the layers to improve the water flooding development was systemically studied. The performance features of profile adjustment agent along with its movement inside the layers are recognized.The plugging capacity, anti-flushing and flowing colloidization performance is studied in labs. The recogzization technology for high permeable zones and dominant fluid flow channels in the flushed thick layers is developed. The optimization design for fluid flow diverting inside layers and the related effect avaluation methods are studied. In addition, optimization decision-making software and the traditional numerical simulation software are further improved, in which a flowline simulator is created and used. Another software for avaluating the results is designed.Physically, a kind of new zwitterion polymer and the composite profile adjustment system are developed. A pliable diverting agent, as a part of the system, is developed, which adopts polymer gel as plugging agent for high permeable zones. With the diverting agent the fluid agent can be diverted into low permeable zones, thus it improves flooding efficiency in thich layers.The technology has been experimented in 20 wells with polymer gel system. After treatment a good result was obtained in the connecting production wells. The research provides a successful reference to the application of polymer gel system for plugging high permeable zones in thick layers.