Laboratory Development Of Viscoelastic Particle Profile Control Agent With Slow Expansion And Salt Resistance

In this paper, a profile control agent, the HTYT-1slow expansion of flexible viscoelastic particle profile control agent, which takes the monomer and the attapulgite as the main chemical and takes the SN as cross-liker and takes the GL as initiator agent was synthesized in the laboratory, and the best formulation was determined by the concentration of each component of the profile control agent, according to the technical problems (buried deep, the high salinity etc)of injection wells profile control encountered in most reservoirs in China. Thus, on different salinities and different temperatures conditions, the qualities of profile control agent such as the water absorption, the water absorption rate, the strength, the heat stability, the water-retaining property, the restorability, the selection of injection, the improvement ratio of water entry profile and the sweeping efficiency were evaluated systematically through static experiment and core sample flowing experiment. The experiment results indicated that this new synthetic profile agent has good viscoelastic and flexible, in addition, the effects such as slow expansion and salt resistance are good, entirely performance can satisfies the request of profile control on different reservoir conditions.Based on these research works which have done in laboratory, in early April2010this newly synthesized HTYT-1slow expansion of flexible viscoelastic particle profile control agent was applied in Yan9reservoir Hang7well of Changqing oil field, and attained a good effect of increasing oil and reducing water.