The Mechanism Research On Chemical Removal Of Tuffaceous Volcanic Reservoir In Hailaer Oilfield

The mostly oil-bearing series of both B16 and B28 block of Hailaer oil field belongs to Xing'anling group oil layer. Because of complicated reservoir lithology,with high content of tuff and clay mineral,it result in reservoir agglutinate pulverize,water-sensitive and Velocity sensitivity severity,reservoir water-flooding difficult. For the moment,there are 5 of 11 injection wells in B16 block in the fracture pressure; at the same time,conventional acidization experiment for B16 rock core also shows : Good acidifying fluid for Su 131 and B301 block is not suit for tuff sandstone acidification.For solve the water flooding problem of Xing'anling group contain tuff reservoir, we need to unfold the research of Hailaer oil field Xing'anling group contain tull reservoir acidification engineering, to meet the demand of the needs of Hailaer oil field exploration .Based on Hailaer oil field, the project is studied in till reservoir 's lithologic characteristic, analyses the cause of its slugging , preliminary screening some kind of stabilizer, and then screen out fit to tuff reservoir through the experiment multiple match with main body acid.Through the experiment, we find that the anti-swelling effect of 0.8%T1+ inorganic salt +surfactant is best. We match two formulations:B2 for voidage bigger than 10% and A4 for voidage less than 10%. Based on indoors experiment, acidifications are put on Hailaer oil field, which shows that this acid liquor system can lower greatly the injection pressure and enhance the effect of injection, which supplies gist to Generalize cosmically this technology.