STUDY ON THREE TYPES OF CROSSLINKER AND THEIR PROFILE MODIFICATION EFFICIENCY IN HPAM SOLUTION

Three types of crosslinker are prepared and their properties in HPAM solution are evaluated in laboratory. To prepare organic aldehyde by sodium lactate, sodium bichromate and organic sulfur in a mess ratio of 3/1/2, and prepare composite metal crosslinker by sodium bichromate, cobalt chloride, organic sulfur and sodium lactate in 6/3/8/20. When 3 types of crosslinker are added in the HPAM solution, it is detected that the profile modification efficiency of Al-Cr composite crosslinker in HPAM polymer solution is better than that of the two others. The composite crosslinker can increase the oil recovery by 27.3% and it is suitable for applying in the formation with a temperature of about 70℃ and a salinity of 30000 mg/L.