The research status and summary of adsorption and retention mechanism of polymer

Abstract

The polymer flooding technology has been established a relatively scientific and complete technical theory system, after decades of development. Theoretical and field applications have shown that the key to profile control and flooding is adsorption and retention of polymer in reservoirs. When the polymer flows through the porous medium of the reservoir, it will be adsorbed and trapped in the pores of the cores, resulting in serious decrease in the permeability of water in the porous medium of the reservoir, while only a slight decrease in the permeability of oil, increasing the mobility of crude oil, effectively increasing the injected water swept volume, and thereby improving the comprehensive economic benefit of water-flooding development reservoir. In order to further understand the adsorption and retention mechanism of polymer, guide the oilfield production, and achieve the purpose of low injection of polymer and the high production of oil, in this paper, we conducted a lot of research on the adsorption and retention mechanism of polymer at home and abroad. The comprehensive analysis shows that electrostatic and mechanical trapping are the main causes of adsorption and retention, followed by polymer concentration, degree of hydrolysis, rock wettability and formation mineralized water composition.