Abstract
For the main polymer flooding oilfield expansion and infill wells three times the area of deployment, the proposed development mode II oil reservoir of polymer flooding and thin and poor combination of three encryption. In this paper, the use of leading edge water monitoring methods and principles of the plane heterogeneity through physical simulation to study the effects of different mining methods II oil and a combination of the three encryption effects of flooding. Studies have shown that, together with the water flooding recovery can be increased by nearly 19 percent, higher than the water poly alternate drive about 4%, the injection pressure is about three types of reservoir 0.3MPa, flat stage water flood sweep efficiency compared with an average of 30.95%. Meanwhile polymer injection can increase oil recovery by 21%, but the limited ability of three types of oil injection, polymer injection pressure during injection 0.22PV up to 0.8MPa, water flooding stage by an average of 30 percent compared to the plane sweep efficiency. The water flooding recovery poly alternately raise only 15%, an average increase of 26.95 percent driven phase plane sweep efficiency than water. Theoretical results of this study may provide a reliable basis for the future development of efficient thin and poor reservoirs.
Highlights
During the “Eighth-Five-Year Plan” and “Ninth-FiveYear Plan”, the polymer flooding technologies have undergone scientific and technological breakthroughs in major oil fields, especially in Daqing Oilfield, and have achieved long-term development
The main oil reservoir has achieved significant effects of increasing oil and reducing water cut, which have been becoming popular in oil fields for high-efficiency development
With the reduction of the potential for polymer flooding in major reservoirs, the industrialized polymer flooding of secondary oil reservoirs has been successively put into production[1,2,3,4]
Summary
During the “Eighth-Five-Year Plan” and “Ninth-FiveYear Plan”, the polymer flooding technologies have undergone scientific and technological breakthroughs in major oil fields, especially in Daqing Oilfield, and have achieved long-term development. According to the previous research results of polymer flooding technology for secondary oil reservoirs, the polymer flooding of secondary oil reservoirs needs to limit the target, and the lower limit of polymer flooding technology of thickness is 1m and permeability is 100×10-3μm for secondary oil reservoirs, but he lower limit of water flooding technology of thickness is less than 1m and permeability is less than 100×10-3μm for poor oil reservoirs[5, 6]. In those units, many problems have been interference each other, but the research of this interference is very less on the adaptability of the secondary and third oil reservoirs. The micro-electrode measurement (Figure 1) was used to determine the change in resistivity at each point, and related software was used to determine the distribution of oil and water in each layer at different times to obtain the oil-water front in the displacement process
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