Analysis of Main Control Factors and Improvement Methods for Injection Quality of ASP Flooding
The large-scale application of chemical flooding is constantly refreshing the recovery limit of Daqing Oilfield,and becoming an important technology for sustainable and effective development of the oilfield.The quality of the injection system is the foundation of ASP flooding.In view of the prob-lems of long process,multiple nodes,multiple types of agents,wide involvement of links,and diffi-cult management in the injection process,an analysis is carried out from the process characteristics,sys-tem characteristics,and process nodes.The main control factors affecting the injection quality of ASP flooding are clarified,a supporting technology improvement method is established.The use of an auto-matic weighing module can achieve precise control of polymer mother liquor concentration,reducing the error range from±5% to 0-3% .At the same time,the mother liquor mass concentration can be adjusted from 5 000 mg/L to 5 500 mg/L,and the alkali concentration compliance rate can be in-creased by 1.4% to 3.1% .The pressure difference limit for descaling inside the station is 0.5 MPa,the pressure difference limit for descaling outside the station is 0.3 MPa,and equipped with descaling meth-ods such as flushing,acid washing,and cavitation jet.The nearest sterilization location is the export of the sewage station,and after adding fungicides for sterilization,the viscosity retention rate can be maintained at over 75% .The above measures have been applied in six ASP flooding blocks in the Sa-zhong Development Zone,achieving a stable production period with a quality qualification rate of over 98%,and a viscosity loss rate controlled below 19% .The injection indicators for ASP flooding blocks have gradually improved.The research results can effectively guide the management of chemical flooding injection,and are of great significance for improving the quality and efficiency of chemical flooding.
chemical floodinginjection qualitymain control factorscompliance rate of alkali solu-tionviscosity loss
万方数据
维普
