A New IOR Method for Mature Waterflooding Reservoirs: “Sweep Control Technology”

Abstract

For improving the recovery of water flooding heterogeneous oil fields, the classical conformance control method is to enlarge the swept volume as far as possible, usually by fine layering, profile control and water shutoff, and fracturing and acidizing, etc. However, with watercut rising, the remaining oil distributes in deep reservoirs, making the classical methods less effective. “Sweep Control Technology (SCT)”, a new IOR method, is put forward. The whole production-injection flowing field is taken as the studying target. The waterflooding effect impacting factors were classified into three levels: large-scale macroscopic heterogeneity, middle-scale mesoscopic heterogeneity and pore-scale microscopic heterogeneity. Based on the impact of the three levels of heterogeneity on sweep efficiency, we developed new corresponding SCT materials. For large-scale heterogeneity, we put the materials in accurate place to effectively inhibit water flow prevailing channels. For the middle and small scale heterogeneity, the water flow is diverted to achieve effective sweep control by means of effective material migration. So that we can realize complete adjustment and control of the whole flowing field to achieve efficient remaining oil displacement, and to improve the recovery of water flooding phase. The research and experiments in laboratory and field have proved the advancement of the method.

Nuevas tecnologías de recobro químico y su aplicabilidad en yacimientos colombianos

“…Limitaciones de los polímeros HPAM. A partir de las limitaciones técnicas mencionadas, en los últimos años las investigaciones se han centrado en el desarrollo de nuevos polímeros con buen rendimiento en condiciones de alta temperatura y alta salinidad (HTHS) (Albonico & Lockhart, 1993;Thomas, 2008;Wu et al, 2014;Wu et al, 2015, Delgadillo-Aya et al, 2018Araujo & Araujo, 2018). Las nuevas tecnologías de inyección de polímeros proponen un incremento en su resistencia mediante la adición de nuevos monómeros, funcionalizaciones en HPAM (El-Hoshoudy et al, 2017) o polímeros mejorados con nano partículas (Bennetzen & Mogensen, 2014;ShamsiJazeyi et al, 2014), thermo thickening polymers (Shaefer et al, 2011) y biopolímeros (Quadri et al, 2015;Sveistrup et al, 2016), entre otras modificaciones posibles.…”

Experimental Investigation on a Novel Particle Polymer for Enhanced Oil Recovery in High Temperature and High Salinity Reservoirs

“…ese technologies have achieved significant success worldwide [1][2][3][4][5][6][7][8][9]. However, the temperature and salinity resistance of the polymer is limited, and as a continuous phase high viscosity fluid, its mechanism of oil displacement is also contradictory [10][11][12][13][14][15][16][17]. Over the years, many researchers have carried out a lot of studies aiming at these problems, such as the development of thermo-resistant and salt-resistant monomer copolymer, comb polyacrylamide polymer, and hydrophobic association polymer.…”