Study On In-depth Diversion Technology Companying With Polymer Flooding Applied In Suizhong 36-1 Oilfield

In order to EOR, the technique of water shut-off and profile control has been used to improve water development. Because of Suizhong 36-1 oilfield having the characters of large well spacing, thick oil layer, serious lack of homogeneity and obvious microscopic throats, polymer solution flows into oil well that leads to low sweep efficiency and inferior polymer development. According to Suizhong 36-1 oilfield, the in-depth diversion agents which are used to plug large microscopic throats and divert the fluid in order to argument sweep efficiency and enhance oil recovery rate, are studied in this paper, including the in-depth diversion agents using gel and dispersed gel.Hydrophobic association polymer used in oilfield now is cross linked by phenolic resin that makes up the in-depth diversion agent, whose gelation factors are learned. The application performances of the gel cross-linked by phenolic resin are studied with physical simulation trails, showing that it has good easy-to-inject property, plugging property, stability and enhancing oil recovery rate. Based on the request of the dispersed gel's preparation, the formula consists with polymer AP-P4 and cross linker Cr(AC)3, which is generated by shear. The dispersed gel is described by microstructure and particle size distribution, whose application performances are evaluated, showing that it has good easy-to-inject property, plugging property, containing salt ability to a certain degree. In accordance with suizhong 36-1 oil field, adequate operating fluids are designed, including depressurization to augmented injection and gel breaker.The in-depth diversion companying with polymer flooding technology in the oilfield offshore will be used to enhance oil recovery rate, whose key question is solved by the study above.