The Property and Influential Factors of Swellable Particulate

Recently, in order to improve the oil displacement effect of water flooding and polymer flooding, there has been unfolded effective work in the research of profile modification technique and application of pre-cross linked swellable particulate in domestic oilfield. Aiming at the physical demand in the development of Daqing oilfield, the authors do some researches on the characteristics of some kinds of pre-cross linked swellable particulate in different carrier fluid by making use of the experimental method indoors. The result shows that the category and salinity of carrier fluid and the chemical composition of pre-cross linked swellable particulate are the main factors that affect water intake rate, swelling rate and anti-shear ability of pre-cross linked swellable particulate. The theoretical analysis shows that because of the effect of electrical double layer, the water intake rate and swelling rate become weaker in the produced water carrier fluid, however, the anti-shear ability become stronger. Under the combined effect of electric double layer, intramolecular cross linking and surface gel of pre-cross linked swellable particulate the water intake rate, swelling rate and anti-shear ability become stronger in the carrier fluid with Al³⁺, Cr³⁺ and composite crosslinked polymer. Under the effect of wrap in the polymer fluid and oil, the water intake rate and swelling rate become weaker while the anti-shear ability become stronger.