Characteristics of composite microspheres for in-depth profile control in oilfields and the effects of polymerizable silica nanoparticles

Tang, Xuechen; Kang, Wanli; Zhou, Bobo; Gao, Yingming; Cao, Changxiao; Guo, Shujun; Iqbal, Muhammad Wassem; Yang, Hongbin

doi:10.1016/j.powtec.2019.09.070

Cited by 46 publications

(19 citation statements)

References 47 publications

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“…The results suggest that the elasticity of the microspheres increases by the incorporation of VSNPs, which can be explained by the following factors: (i) The inorganic VSNPs increase the stress and energy required for microspheres deformation; (ii) The VSNPs also increase the cross-linking degree of the microspheres, restricting the movement of polymers. 43 The microspheres have better deformation ability to smoothly pass through the pore throats in the formation due to the improved elasticity by VSNPs, which is beneficial for the deep profile control ability.…”

Section: Resultsmentioning

confidence: 99%

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Nanoscale Polyacrylamide Copolymer/Silica Hydrogel Microspheres with High Compressive Strength and Satisfactory Dispersion Stability for Efficient Profile Control and Plugging

Zhao

Lv³

et al. 2021

Ind. Eng. Chem. Res.

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Polyacrylamide (PAM)-based microspheres are commonly used as water plugging and profile control agents, but the poor mechanical strength and few studies on the dispersion stability, both of which are closely related to the profile control performance, limit the application of microspheres. Herein, we synthesize nanoscale PAM-based copolymer hydrogel microspheres with an inverse microemulsion copolymerization of acrylamide (AM) and 2-methyl-2-acrylic amide propyl sulfonic acid (AMPS) in the presence of vinyl-functionalized silica nanoparticles (VSNPs). The results show that a small amount of VSNPs (1.0 wt %) increases the compressive strength of the hydrogel by 0.6 times. The swollen nanoscale PAM/silica hydrogel microspheres show good dispersion stability. VSNPs significantly improve the elasticity of the hydrogel microspheres, and their dispersion stability under high temperature and high-salinity conditions. The simulation evaluation of core plugging suggests that the plugging rate of PAM-based polymer/silica hybrid microspheres with addition of 0.7 wt % VSNPs increases from 80% to 92% compared to neat polymer microspheres. This work provides a novel design of nanoscale cross-linked microspheres for deep profile control in different geological environments.

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Section: Resultsmentioning

confidence: 99%

“…The improved plugging ability of P1 may be attributed to its better elasticity, which enables the microspheres migrate into deeper areas under fluid pressure. 43 4. CONCLUSIONS Nanoscale P(AM-co-AMPS)/SiO 2 hydrogel microspheres are synthesized with an inverse microemulsion copolymerization of AM and AMPS in the presence of reactive VSNPs.…”

Section: Resultsmentioning

confidence: 99%

Nanoscale Polyacrylamide Copolymer/Silica Hydrogel Microspheres with High Compressive Strength and Satisfactory Dispersion Stability for Efficient Profile Control and Plugging

Zhao

Lv³

et al. 2021

Ind. Eng. Chem. Res.

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“…Microsphere modifications are micron-size silica-reinforced polymer microspheres synthesized using the above-mentioned inverse suspension polymerization with the addition of 3-(methacrylyloxy)-propyl-trimethoxysilane (MPS) and silicon dioxide (nano sized) (authors call these microspheres such as PNSCMs) [ 74 , 75 , 76 ]. By adjusting the content of MPS-modified SiO 2 , the microsphere swelling ratio can be regulated well and the sensitivity of the swelling behavior to the environment is weakened.…”

Section: Methodsmentioning

confidence: 99%

“…By adjusting the content of MPS-modified SiO 2 , the microsphere swelling ratio can be regulated well and the sensitivity of the swelling behavior to the environment is weakened. With increasing SiO 2 loading, the microsphere mechanical stability, thermal stability, viscoelasticity, and dispersion stability were correspondingly improved [ 74 ]. PNSCM particle sizes vary between 10 and 100 µm.…”

Section: Methodsmentioning

confidence: 99%

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Ketova

Burin

Galkin

et al. 2022

Gels

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In todays’ world, there is an increasing number of mature oil fields every year, a phenomenon that is leading to the development of more elegant enhanced oil recovery (EOR) technologies that are potentially effective for reservoir profile modification. The technology of conformance control using crosslinked microgels is one the newest trends that is gaining momentum every year. This is due to the simplicity of the treatment process and its management, as well as the guaranteed effect in the case of the correct well candidate selection. We identified the following varieties of microgels: microspheres, thermo- and pH-responsible microgels, thin fracture of preformed particle gels, colloidal dispersed gels. In this publication, we try to combine the available chemical aspects of microgel production with the practical features of their application at oil production facilities. The purpose of this publication is to gather available information about microgels (synthesis method, monomers) and to explore world experience in microgel application for enhanced oil recovery. This article will be of great benefit to specialists engaged in polymer technologies at the initial stage of microgel development.

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“…For microspheres, reverse suspension polymerization, 33 microemulsion polymerization 34 or dispersion polymerization 35 are commonly used in the preparation process. Obviously, not only these preparation processes are relatively complicated, but also only a few literature reports that the particle size of microspheres can reach the nanometer level 36,37 . It can be seen that these profile‐controlling and flooding agents all have the problems of complex preparation process and particle size control.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of a hydrosoluble reversible addition‐fragmentation chain transfer agent and application in the preparation of micro/nano‐polyacrylamide gel dispersions

Yang

Dai

Zhang

et al. 2021

J of Applied Polymer Sci

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A hydrosoluble reversible addition‐fragmentation chain transfer (RAFT) agent named S‐(2‐propionic acid)‐S′‐(2‐methylpropionic acid) trithiocarbonate (PAMPATTC) is successfully synthesized. Then the micro/nano‐polyacrylamide gel dispersions are prepared via one‐pot RAFT polymerization in water to solve the problems of complicated preparation process and particle size control of common profile‐controlling and flooding agents. The structure of the RAFT agent is characterized and confirmed by fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance (1H‐NMR). The effects of different reaction conditions on the properties of polyacrylamide gel dispersions are studied. The polymer dispersity index (PDI) of the polyacrylamide gel dispersions is tested by aqueous gel permeation chromatography, confirming the activity characteristics of RAFT polymerization. The rheological characteristics of the polyacrylamide gel dispersions and liner polyacrylamide are characterized. Compared with the liner polyacrylamide at similar viscosities, it is confirmed that the polyacrylamide gel dispersions were closer to Newtonian fluid, especially at high shear rates and the increasing amount of RAFT agent. The viscoelasticity tests under frequency scanning further confirm that the polyacrylamide gel dispersions are successfully synthesized via aqueous RAFT polymerization. The particle sizes are measured to show that the particle size of the polyacrylamide gel dispersions is micro/nano‐scale. The micromorphology of polyacrylamide gel dispersions is determined to indicate the irregular spherical structure, confirming that the micro‐particles are indeed formed by the aggregation of nano‐particles.

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Characteristics of composite microspheres for in-depth profile control in oilfields and the effects of polymerizable silica nanoparticles

Cited by 46 publications

References 47 publications

Nanoscale Polyacrylamide Copolymer/Silica Hydrogel Microspheres with High Compressive Strength and Satisfactory Dispersion Stability for Efficient Profile Control and Plugging

Nanoscale Polyacrylamide Copolymer/Silica Hydrogel Microspheres with High Compressive Strength and Satisfactory Dispersion Stability for Efficient Profile Control and Plugging

Review of Microgels for Enhanced Oil Recovery: Properties and Cases of Application

Synthesis of a hydrosoluble reversible addition‐fragmentation chain transfer agent and application in the preparation of micro/nano‐polyacrylamide gel dispersions

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