Crude oil development and production in oil reservoirs can include up to three distinct parts: primary, secondary, and tertiary (or enhanced) recovery. One of the most important use of polyacrylamide is in subsurface applications such as enhanced oil recovery (polymer flooding), where high viscosity aqueous solutions are injected to improve the economics of conventional water flooding.  For oil extraction applications, polyacrylamide is used to increase the viscosity of water to improve the effectiveness of the water flooding process. A polymer solution is more viscous than brine without polymer. In a flooding application, the increased viscosity will alter the mobility ratio between the injected fluid and the reservoir oil. The improved mobility ratio will lead to better vertical and areal sweep efficiencies and thus higher oil recoveries. Polymers hve also been used to alter gross permeability variations in some reservoirs. In other words, the PAM-injected solution assists in...

Polyacrylamide is a versatile chemical treatment agent in oilfield. In oil extraction it could be used as a flooding agent, water shutoff regulator, drilling fluid regulator, fracturing fluid additives, especially in cementing, completion and workover. The oil industry is the largest area of polyacrylamide applications. Polyacrylamide (PAM) is not only a high-performance flocculants, but also because of the high viscosity of aqueous solution, but also a very good thickener. Due to its thickening, flocculation and regulation of rheological properties it can be used as a drilling fluid, fracturing fluid, and polymer flooding in the exploitation of oil extraction. The key to the application is the combination of conditions and requirements, Reasonable design and selection of its composition structure, such as molecular morphology, molecular weight, ion degree and so on. 1.Polyacrylamide for drilling mud additives. Drilling fluid in oil extraction works as drilling mud performance adjuster...

For high brines conditions in fracturing,  SINOFLOC   team synthesized the anti-temperature and salt-resistant fracturing fluid thickener with acrylamide monomer and AMPS and by using free copolymerization of an aqueous solution. The optimum conditions of synthesis were determined by lab experiments. The results show that the fracturing fluid has excellent resistance to temperature and salt resistance, and has the characteristics of shear resistance, which is completely broken and the less residue of the filtrate and also less damage to the formation. At present, many oil fields have entered the enhanced oil recovery stage of high water cut stage. Lab experiments and field test studies have shown that polymer flooding is an effective way to improve oil recovery, and has broad application prospects. However, although the most commonly used polyacrylamide has a certain oil displacement effect, the viscosity of polyacrylamide decreases rapidly with the increase of the mineralizat...