Experemental Study On Formula Optimization For Binary Compound Flooding In113-3Block Of Honggang Oilifeld

The north Xing zone has features of thin layer, pool reservoir quality, seriousaeolotropism, and low recovery from water flooding in Daqing Oil-field. So is very importantto develop and carry out EOR methods. The crude oil viscosity is12.9mPa.s, temperature is55℃and reservoir water salinity is11000mg/L~13000mg/L, which is Suitable for conductingchemical flooding. For the actual demands for113-3block of Honggang oilfield development,viscosity properties, hydraulic diameter Dh, mass ratio, the compatibility with porosity ofreseviers, flow characteristics of the associative polymer, Oil displacement efficiency andinjection parameters optimization of binary compound system by physical analogue andtheoretical analysis. The result shows that associative polymer has the features of that thegreater salt resistance, the broader distributions, the smaller inaccessible pore volume, thehigher oil displacement efficiency, the greater the resistance factort and residual resistancefactor with the same viscosity of polymer solution. The improved proportion of associativepolymer quality is ""super-high molecular weight"："high molecular weight"："mediummolecular weight"="17"："60"："23"". The lowest permeability to match "medium molecularweight"polymer is5010-3m~2, the lowest permeability to match "high molecularweight"polymer is7010-3m~2, the lowest permeability to match "super-high molecularweight"polymer is9010-3m~2. With the condition that the comtent of"high molecularweight"polymer in associative polymer quality is75%, the lowest matching permeability is7010-3m~2. The effect of increasing oil by "profile+binary compound system" is better thanthat of binary compound system, and the effect of increasing oil by early profile is better thanthat of later profile. Through the comparision with polymer gelling fluid, high concentrationpolymer has better plugging effect and simpler injection allocation technology. Therecommended field implementation planning is that0.08PV pre-slug (the concentration ofassociative polymer solution is2400mg/L)+0.3PV main slug (the concentration ofassociative polymer solution is1800mg/L, the surfactant concentration is0.3%)+0.2PVminor slug (the concentration of associative polymer solution is1800mg/L, the surfactantconcentration is0.2%)+0.05PV protective slug(the concentration of associative polymersolution is1800mg/L).