Abstract
In this paper, the feasibility study of chemical flooding is carried out for ultra-high porosity and high permeability heavy oil field with permeability higher than 10 μm2 and porosity greater than 35%. The viscosity-concentration relationship of four kinds of oil flooding systems such as hydrolyzed polyacrylamide, structural polymer A, structural polymer B and gel was studied. The results showed that the viscosity of ordinary polymer and structural polymer B was lower compared with other two types of oil displacement agents, and the viscosity of structural polymer A was higher. The higher the concentration, the higher the viscosity retention rate. The gel system has the highest viscosity and best anti-shear ability. The resistance coefficient and residual resistance coefficient of structural polymer A and gel system were further studied. The results show that permeability, velocity and polymer concentration all affect the resistance coefficient and residual resistance coefficient. From the point of view of resistance establishment ability, it is considered that structural polymer A is not suitable for permeability formation above 10 μm2. Gel system has stronger ability to establish resistance coefficient than structural polymer A flooding system, and it is more feasible for formation system with permeability above 10 μm2.
Highlights
IntroductionChemical flooding [6] [7] [8] technology has become an important means to greatly enhance oil recovery in medium and high permeability oilfields
The results showed that the viscosity of ordinary polymer and structural polymer B was lower compared with other two types of oil displacement agents, and the viscosity of structural polymer A was higher
The results show that permeability, velocity and polymer concentration all affect the resistance coefficient and residual resistance coefficient
Summary
Chemical flooding [6] [7] [8] technology has become an important means to greatly enhance oil recovery in medium and high permeability oilfields. The research on adaptability of chemical flooding for ultra-high porosity and high permeability heavy oil fields with average permeability greater than 10 μm can provide technical countermeasures for efficient development of such reservoirs; on the other hand, it is of great significance to expand the scope of chemical flooding in offshore oilfield and improve chemical flooding technology. The viscosity, resistance coefficient and residual resistance coefficient of partially hydrolyzed polyacrylamide, structural polymer A [9], structural polymer B [10] and gel were studied, and the best system was selected out of four
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