Application and Optimization of the Rheological Model for a Hydrophobically Associating Dendrimer Polymer

Abstract

Polymer flooding is one of the most important enhancing oil recovery (EOR) technologies in the world. With the optimization of polymer synthesis, the performance of polymer solutions has been greatly improved, which can adapt to more complex oil and gas reservoirs. However, with the continuous improvement of the properties of polymer solutions, the elastic property of polymer solutions is significantly improved, and the rheological law has also changed. This series of changes affects the application of polymer flooding reservoir numerical simulation technology. Therefore, constructing an accurate description model and precise limitation conditions is particularly important. The rheological curve with a wide shear range (0.1~10,000 s−1) and the viscoelasticity of the two polymers (partially hydrolysed polyacrylamide (HPAM) and dendritic hydrophobic association polymer (DHAP)) were analyzed and tested by a rotating rheometer. The results showed that under the experimental conditions, the rheological curve of both polymers can be described by the Carreau rheological model. Meanwhile, the structural viscosity of the hydrophobically associating polymer solution (DHAP) greatly improved the elasticity of the solution and led to the change of elastic modulus. Considering the influence of elastic characteristics on the rheological curve, the relaxation time spectrum derived from small vibration experimental data was used to limit the characteristic relaxation time, that is, the value range of λ. It was observed that the experimental data were highly matched with the nonlinear regression fitting curve of the Carreau rheological model. Therefore, the relationship between different test parameters should be fully considered while studying the rheological constitutive equation of viscoelastic fluid, so as to optimize and improve the equation of it.

Study on the rheological behavior of aqueous solutions of polyacryloylglycinamide

“…At present, polymer flooding 1,2 is the most widely used means of tertiary oil recovery technology due to its better oil flooding effect, and it is also one of the key initiatives for enhanced oil recovery (EOR). [3][4][5][6] Its oil repulsion mechanism 7 uses an aqueous polymer solution to increase the viscosity of the repellent medium, increase the fluidity ratio between the repellent phase and the repelled phase, and increase the ripple coefficient. Among them, polymers represented by polyacrylamide and its derivatives 8,9 are widely used in the oil and gas extraction industry due to their good solubility in water.…”

Synthesis and salt resistance of non-ionic polymer P (AM/ APEG400/NVP/SM)

“…At present, oil and gas exploitation has entered a complex and challenging reservoir with high temperature, high salinity and low permeability [1][2][3]. Polymer flooding [4,5] is the most mature and effective enhanced oil recovery (EOR) technology in China and has achieved great success in the development of major oil fields in China. However, with the continuous development of conventional reservoirs, high-temperature and high-salinity reservoirs have become a vital development object of polymer flooding EOR.…”

The Effect of Shear on the Properties of an Associated Polymer Solution for Oil Displacement

“…The principle of polymer flooding technology is to improve the oil displacement efficiency by increasing the viscosity of the displacement phase, reducing the seepage capacity of the displacement phase, and controlling mobility [ 1 , 2 , 3 ]. Such action mechanisms make polymer flooding technology the main tool to improve oil recovery in the later stages of water-driven development.…”