Dispersed Particle Gel-Strengthened Polymer/Surfactant as a Novel Combination Flooding System for Enhanced Oil Recovery

Abstract

A novel dispersed particle gel-strengthened polymer–surfactant (DPS) combination flooding system was proposed and demonstrated for enhanced oil recovery in high water cut mature oilfields. As compared to a conventional polymer–surfactant (PS) combination flooding system, DPS systems have a higher viscosity and a more stable network structure. The polymer is mainly a source of the viscosity, while the surfactant plays a key role in reducing the interfacial tension (IFT). The added dispersed particle gel (DPG) has a synergistic viscosity increase effect, whereas for the DPG particles, the salinity and aging time have a slight effect on the IFT reduction capacity of the DPS system. On the basis of sand-pack flowing experiments, the DPS system has a better mobility control capacity than the PS system in the combination flooding stage and the following water flooding stage. Parallel sand-pack flowing experiments indicate that injection of a DPS system can effectively improve the profile control. The added DPG particles could intersperse in the three-dimensional network structure, which increases the stability of the DPS system in solution and porous media. Through the improved synergistic effect of the swept volume capacity and high displacement efficiency, the oil recovery capacity of the DPS system is significantly enhanced. The DPS system may be an alternative for enhanced oil recovery in other similar high water cut mature oilfields.

Analytical solutions of polymer transport in porous media under magnetic effect

“…Moreover, they can control the saturation magnetization and the initial susceptibility. In order to simplify equation (11), let us do the followings, oM oq…”

“…On the other hand, the magnetic field can be used with polymers in some applications such as the magnetic nanoparticles implementation to eliminate pollutants from the produced water without chemicals [7][8][9][10]. Another example is the usage of magnetic resonance imaging and measurements to monitor oil displacement by water-flooding and polymer flooding [11]. Also, Ming et al [12] presented a magnetic resonance investigation for low-salinity waterflooding for EOR.…”

Structure parameter optimization and bearing limit analysis of the expansion unit of three-roller tube expander

“…Open Sci. 7: 191630 pressure and torque depends on the strength of the upper and lower joints of the bellows, the structure of the tube expander and the joint contact unit and the form of tube expansion [13,14]. The joint strength is an objective constant value; therefore, the magnitude of bit pressure and torque mainly depends on the design of the structure and motion state of the tube expansion unit.…”

Enhance The Properties of Cellulose Fracturing Fluids By Cellulose Nanocrystals

“…They are characterized by high temperature, tight and deep burial, so reservoir stimulation has become an indispensable and e cient development method (Lau et al 2016;Yang et al 2018;You et al 2018; Dai et al 2019). Currently, for the development of tight oil and gas, and other resource reservoirs, it is particularly important to improve the performance of fracturing uids (Scanlon et al 2015;Zhao et al 2018). Conventional water-based fracturing uids include guar gum fracturing uids, cellulose fracturing uids, and polymer fracturing uids (Adewole and Muritala 2019).…”