The Study On Improve Polymer Flooding Effect Technology In Xinjiang Ⅰ Kind Conglomerate Reservoir

After dozens of years of development, conglomerate reservoir is being exploited with high watercut.Reasonable tertiary recovery method is essential and urgent. According to the reservoir of conglomeratepore structure and the flow characteristics, through different molecular weight polymer reasonable allocate,research wide molecule polymer flooding in the feasibility of the technology of conglomerate reservoir, inorder to form a conglomerate reservoir characteristics of polymer flooding oil technology. Based onmodern reservoir engineering and physical chemistry theory as the guide, the means of modern instrumentanalysis and physical simulation, the "blends with" polymer viscosity polymer molecules, line size,rheological property group Dh, viscoelasticity, flow characteristics, oil displacement efficiency, oildisplacement effect and influence factors of technology and economy benefit evaluation of injectionparameters optimization of the feasibility study. The results show that, compared with commonpolymer,"wide molecule polymer " in salt resistance, heat resistance and stability has advantages, butshearing the gender is poorer. In the same concentration conditions,"wide molecule polymer" solution Dhdistribution than the ordinary polymer of wide. Adaptive experimental studies find that the reservoir rockand polymer "in pore radius valueDr/Dh" range between8~14that wide molecule polymer andconglomerate reservoir has good compatibility. In terms of similar cases,"wide molecule polymer solution"the resistance coefficient and residual resistance coefficient of than ordinary polymer that it has good fluidflow to ability. Injecting the same size (0.38PV), compared with single "high" polymer, and viscositypolymer blends with good effect of oil increase precipitation.The "high" polymer flooding, in comparisonwith the complex polymer flooding recovery3.0%higher. In the main slug put a lead before the field testsslug, can further improve sucks fluid profile, and lead to more follow-up polymer solution into the low reservoirs,expand the sweep volume, improve the recovery.Comprehensive consideration of the economic and technicaleffect, wide molecule polymer compared with single "high" polymer has good technical and economiceffect; Recommended by "complex field with the mother liquor" polymer concentration by1400mg/L~1800mg/L; Recommend flooding oil slug size of0.38PV~0.57PV; In the slug combination the fieldwhen the field tests, recommend slug combination for0.05PV wide molecule polymer (Cp=2400mg/L)+0.47PV wide molecule polymer (Cp=1200mg/L). Consequently the indoor research blends with widemolecular weight polymer flooding technology with the feasibility of conglomerate reservoir in Xinjiangthat is the important guiding significance for the actual production of the field.