A PILOT TEST OF POLYMER FLOODING IN AN ELEVATED-TEMPERATURE RESERVOIR

We conducted a pilot test of polymer flooding in the Shuanghe reservoi r located in the southeast Henan oil field, China. The target reservoi r has a net thickness of 15.56 m (50 ft), an average permeability of 4 20 md, and a temperature of 75 degrees C (167 degrees F). The polymers used are two types of modified partially hydrolyzed polyacrylamides, named S525 and S625, which have molecular weights of 16,700,000 and 19 ,670,000 daltons, respectively. The objective of this pilot test is to investigate the feasibility of polymer flooding for improving oil rec overy in an elevated-temperature reservoir. The polymer flooding start ed in February 1994. Through December 1995, a total of 246 tons (about 0.5 x 10(6) lbm) of dry polymer had been used with an injection conce ntration of 900 to 1,100 ppm. The pore volume (PV) injected reached 0. 2164. As a result, oil production increased by 22,000 tons (184,000 bb l) and water production decreased by 153,000 tons (962,000 bbl), which accounts for the incremental oil recovery of 3.8% and water-cut reduc tion of 5.6% in the test block. We estimate that, by the end of this p roject, the ultimate increase in oil production will exceed 63,000 ton s (528,000 bbl) with the enhanced oil recovery going up to 9.8%. The y ield is 0.2 tons more oil produced per kilogram of polymer injected or 0.7 barrel of oil produced per pound of polymer. We attribute the suc cess of the pilot test to the techniques used during the implementatio n of the flooding, including prevention of polymer-thermal degradation , good reservoir description, and the profile modification carried out before and after the polymer injection. This pilot test illustrates a case where polymers with extra-high molecular weight are successfully injected in an elevated-temperature reservoir to control the mobility ratio and modify the permeability profile.