Performance Evaluation and Adaptability Research of Flowing Gel System Prepared with Re-injected Waste Water

[摘要] The crosslinking intensity and stability of flowing gel system prepared with re-injected waste water are seriously affected as the high salinity waste water contains a high concentration of Na+, Fe2+, S2-, Ca2+, etc. The influence of various ions on the flowing gel system can be reduced by increasing polymer concentration, adding new ferric ion stabilizing agent (MQ) and calcium ion eliminating agent (CW). The technique of profile controlling and oil-displacing is carried out in Chanan multi-purpose station, Chabei multi-purpose station and Chayi multi-purpose station of Huabei Oilfield. The flowing gel system is injected from 10 downflow wells and the 15 offsetting production wells have increased the yield by 1770 tons.

[发布机构] Engineering Technology Research Institute of Huabei Oilfield Company, Renqiu, Hebei, China^1;Petrochina Hebei Marketing Company, Renqiu, Hebei, China^2;PetroChina Southwest Marketing Company, Renqiu, Hebei, China^3

[关键词] Cross-linking intensity;High salinity;Huabei oilfield;Multi-purpose;Performance evaluations;Polymer concentrations;Production wells;Stabilizing agents