Effect of non-crosslinked polymer (ADDA) on acid-rock reactions: synthesis and thickening laws

Quan, Hongping; Xuele, Zhen; Wu, Yang; Duan, Wengui

doi:10.1007/s10965-022-03024-3

Cited by 4 publications

(1 citation statement)

References 25 publications

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“…However, the insufficient temperature resistance of thickened acid limits its application in the acid fracturing of high-temperature wells [ 14 , 15 , 16 , 17 ]. After investigation, it was found that the temperature resistance of the existing thickened acid was basically below 140 °C [ 18 , 19 , 20 , 21 ]. In addition, because the acidizing flowback fluid contains a large amount of Ca 2+ when it is used to prepare conventional thickened acid, the viscosity is low, the viscosity increase rate is slow or even has no viscosity, and the flowback fluid cannot be reused, resulting in greater pressure on environmental protection.…”

Section: Introductionmentioning

confidence: 99%

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Li,

Wang,

Lai

et al. 2024

Polymers

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Two acid thickeners, ADMC and ADOM, were prepared by aqueous solution polymerization using acrylamide (AM) and methacryloyloxyethyl trimethyl ammonium chloride (DMC) as raw materials, with or without the introduction of octadecyl polyoxyethylene ether methacrylate (OEMA). It was characterized by FTIR, 1H NMR, and the fluorescence spectra of pyrene. The double-layer thickening mechanism of ADOM was proved by comparing the thickening and rheological properties of ADMC and ADOM tested by a six-speed rotary viscometer and a HAKKE MARSIV rheometer during the acidification process. The results showed that the synthetic product was the target product; the first stage of the self-thickening ADOM fresh acid solution during high-temperature acidification was mainly affected by Ca2+ concentration, and the second stage of self-thickening was mainly affected by temperature. The residual viscosity of the 0.8 wt% ADOM residual acid solution was 250, 201.5, and 61.3 mPa·s, respectively, after shearing at 90, 120, and 150 °C for 60 min at a shear rate of 170 s−1. The thickening acid ADOM with a hydrophobic association structure has good temperature resistance and shear resistance, which can be used for high-temperature deep-well acid fracturing. In addition, no metal crosslinking agent was introduced in the system to avoid damage to its formation, and ADOM exhibited good resistance to Ca2+, which could provide ideas for the reinjection of the acidizing flowback fluid. It also has certain advantages for environmental protection.

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Section: Introductionmentioning

confidence: 99%

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Li,

Wang,

Lai

et al. 2024

Polymers

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Effects of converging-diverging pore geometry on the acidizing process with non-Newtonian Carreau-type fluids

Motta

Santos

Ventura

et al. 2023

Chemical Engineering Science

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Self-Assembly Systems Based on Betaine-Type Hydrophobic Association Polymer Used in Acid Stimulation: Effects of Surfactant and Salt Ion

Hu,

Quan,

Shen

et al. 2024

ACS Omega

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Hydrophobic association polymers containing various functional groups have a great deal of application potential as a self-thickening agent in carbonate acidification, while the improvement of their viscosification ability under high temperature conditions remains a significant challenge. A kind of betaine-type hydrophobic association polymer (PASD) intended for use as an acid thickener was synthesized through aqueous solution polymerization with sulfobetaine and a soluble hydrophobic monomer. The structure of PASD was characterized by FT-IR and 1 H NMR. It is found that during the acid-rock reaction, the physical cross-linking between PASD and cationic surfactants (STAC) occurs through noncovalent bonding forces such as micellar interaction and electrostatic interaction, forming a self-assembly acid. The optimum conditions for the construction of the self-assembly acid and its viscosification properties, rheological properties, temperature, and salt resistance were evaluated by a six-speed rotating viscometer and a HAAK MARSIII rheometer. The results suggest that the main source of the viscosity rise of the self-assembly acid is the CaCl 2 produced during the acid-rock reaction. As the acid-rock reaction progresses, the hydrodynamic radius of the self-assembly acid increases, and tighter aggregation structures form. The viscosity of the self-assembly spent acid still keeps in 140 mPa•s under 140 °C shearing for 1 h at 170 s −1 , which indicates that the self-assembly acid has excellent viscosification ability and temperature resistance. Compared to PASD acid, the self-assembly acid can be used at a wider range of temperatures, and its research and development have given rise to novel ideas for the use of HAWPs as an acid thickener.

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Effect of non-crosslinked polymer (ADDA) on acid-rock reactions: synthesis and thickening laws

Cited by 4 publications

References 25 publications

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Two-Level Self-Thickening Mechanism of a Novel Acid Thickener with a Hydrophobic-Associated Structure during High-Temperature Acidification Processes

Effects of converging-diverging pore geometry on the acidizing process with non-Newtonian Carreau-type fluids

Self-Assembly Systems Based on Betaine-Type Hydrophobic Association Polymer Used in Acid Stimulation: Effects of Surfactant and Salt Ion

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