Preparation and interfacial behavior of surface-active microspheres for both emulsion stabilization and profile control

Gong, Jincheng; Ji, Yanfeng; Wang, Yanling; Fan, Haiming; Wei, Zhiyi; Li, Chunyang

doi:10.1016/j.petrol.2021.109414

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Finally, postinjection of water was performed. Absorption rates of high- and low-permeability cores at each stage, along with pressure changes before and after the gripper, were measured [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Liu,

Peng

2023

Polymers

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With the increasing development of low-permeability reservoirs, the significance of conformance control treatment has risen considerably. To address the conflict between injectability and plugging performance, as well as to enhance the deep migration capacity of conformance control agents, preformed submicron crosslinked polymer coils (SCPCs) have been manufactured using aqueous solution dispersion polymerization. Fourier transform infrared and scanning electron microscopy were employed to examine the chemical structure and micromorphology, while particle size distribution, zeta potential, rheological, and filtration properties were analyzed. The effectiveness of conformance control was confirmed through the parallel core displacement. The effective particle size of SCPCs was at a submicron level (500~800 nm). SCPCs exhibit a transitional threshold concentration between gel and sol states (0.25 wt%~0.5 wt%). SCPCs can efficiently block the 1.2 μm microporous filter membrane. The filtration time is up to 67.8 min. SCPCs can improve the water absorption rate of lower permeability cores from 21.21% to 57.89% with a permeability difference of 5. Therefore, SCPCs have good injectability, plugging performance, and deep migration capacity and can be used for conformance control in low-permeability reservoirs.

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Section: Methodsmentioning

confidence: 99%

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Liu,

Peng

2023

Polymers

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“…Based on improving the plane and microheterogeneity of water flooding and realizing the technical requirements of fluid flow diversion in oil layers, it is necessary to carry out effective profile control and displacement treatment of reservoirs [ 2 , 3 , 4 , 5 ]. At present, polymer microspheres and polymer capsules are mainly used for plugging to induce a diversion of the fluid flow of the displaced medium, and then chemical displacement agents are added for oil displacement [ 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ]. The application of polymer capsules can effectively block high permeability layers—even high permeability bands or large pores—and increase the utilization of medium and low permeability layers.…”

Section: Introductionmentioning

confidence: 99%

“…In order to improve the plugging effect in the dominant leaking area, controllable release micro/nanocapsules and displacement agents with low initial viscosity and environmental response have been screened and evaluated in the laboratory. The results show that intelligent nanocapsule systems can effectively block the water channel, can change the flow direction of the injected fluid, can improve the reservoir heterogeneity, can improve the sweep and oil displacement efficiency and have the potential to improve the recovery of low-permeability reservoirs [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Performance Evaluation and Action Mechanism Analysis of a Controllable Release Nanocapsule Profile Control and Displacement Agent

Shi

Li³

et al. 2023

Polymers

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With the acceleration in oilfield developments, reservoir advantage channels have been gradually developed. This has led to ineffective circulation in the oilfield injection system and a significant decrease in production. The profile control and displacement technology of low-permeability and heterogeneous reservoirs are in urgent need of updating. In this paper, an intelligent profile control and displacement agent is proposed. The controlled release mechanism and profile control and displacement mechanism is clarified by physical simulation experiments. The profile control agent is a nanocapsule with environmental response and controlled release. The structure of the capsule is a core–shell structure, which is composed of an amphiphilic copolymer AP-g-PNIPAAM and Janus functional particles. The surface chemical stability of the micro/nanocapsule is analyzed by a potentiometric method. The study shows that a temperature at 45 °C causes a potential change in the micro/nanocapsule, indicating that the micro/nanocapsule has a slow release at this temperature. When the temperature is in the range of 40 to 45 °C, the absorbance greatly increases; therefore, it is considered that the capsule wall LCST is about 45 °C. Heating causes the surface contraction of the capsule wall to intensify, the micropores in the capsule wall to increase, the release amount to increase and the release rate per unit time to increase. The release time increases proportionally with the increase in capsule wall thickness. When the release time is the same, an alkaline or acidic environment can improve the release rate of the nanocapsule. The effect of profile control and flooding is evaluated through different differential core models. The research shows that the controlled release micro/nanocapsule has a good environmental response and the internal components can be effectively controlled by adjusting the temperature or pH value. This research has shown that the nanocapsules have good application prospects in low-permeability heterogeneous reservoirs.

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Fabrication and Properties of in Situ Cross‐Linked Supramolecular Gel Based on Host‐Guest Interaction

Shao,

Gong,

Cheng

et al. 2024

ChemistrySelect

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Water‐cut control is critical to efficient reservoir development. In this investigation, a host‐guest inclusion polymer gels system with self‐assembly features was constructed stemming from the host‐guest recognition mechanism. Subsequently, the elements affecting polymer viscosity were discussed. Eventually, the injectivity and plugging performance of the host‐guest inclusion system were measured by core displacement tests. The results indicated that the optimum synthesis temperature of the host polymer and guest polymer were 30 °C and 40 °C, separately, and the optimum total monomer content should be 20 wt%. The polymer system had excellent thickening properties and shearing resistance resulting from host‐guest inclusion interaction and physical hydrophobic association. Meanwhile, it had better plugging performance than host polymer or guest polymer alone. This profile control agent system provides a novel method for settling deep profile control in oilfields.

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Preparation and interfacial behavior of surface-active microspheres for both emulsion stabilization and profile control

Cited by 4 publications

References 26 publications

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Preparation of Preformed Submicron Crosslinked Polymer Coils for Conformance Control in Low-Permeability Reservoirs

Performance Evaluation and Action Mechanism Analysis of a Controllable Release Nanocapsule Profile Control and Displacement Agent

Fabrication and Properties of in Situ Cross‐Linked Supramolecular Gel Based on Host‐Guest Interaction

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