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Original Article | Open Access

Preparation and investigation of self-healing gel for mitigating circulation loss

CNPC Engineering Technology R&D Company Limited, Beijing 102206, P. R. China
College of Chemistry and Chemical Engineering, Southwest Petroleum University, Chengdu 610500, P. R. China
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Abstract

Lost circulation is a common and complex downhole accident in the process of oil and gas drilling. Traditional bridge plugging material has the limitation of poor adaptability to lost formations. Therefore,this study synthesized a new self-healing plugging material to improve the plugging success rate; specifically,the hydrophobic association polymer lauryl methlacrylate-acrylamide-acrylic acid containing Fe3+ was modified via curdlan to form a composite gel with high strength and self-healing properties. The self-healing time,mechanicalness and rheological properties of the self-healing gel were systematically evaluated. The results showed that the modification of curdlan could significantly improve the mechanical properties and rheological strength of self-healing gel,and the chelating structure formed by Fe3+ and carboxyl groups could further enhance the mechanical properties of the self-healing gel. Toughness and storage modulus of the LF0.15C2 self-healing gel with the introduction of curdlan and Fe3+ could reach 30.2 kJ/m3 and 3,458 Pa,respectively. Compared with conventional gel materials,composite gels with self-healing properties exhibited better pressure-bearing capacity of 2.5 MPa,and could effectively avoid causing plugging at the entrance of the fractures by high-concentration inert material and improve the pressure-bearing capacity. In addition,the plugging mechanism of the self-healing gel modified via curdlan in formation fractures was analysed in detail. The self-healing gel modified via curdlan prepared in this work has application potential as a lost circulation material in the field of oil and gas drilling.

Keywords

Self-healinglost circulation materialsdrilling fluidcurdlan

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Advances in Geo-Energy Research
Volume 8 Issue 2,
May 2023
Pages 112-125
DOI: 10.46690/ager.2023.05.05
Cite this article:
Wang R, Wang C, Long Y, et al. Preparation and investigation of self-healing gel for mitigating circulation loss. Advances in Geo-Energy Research, 2023, 8(2): 112-125. https://doi.org/10.46690/ager.2023.05.05

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Received: 18 March 2023
Revised: 06 April 2023
Accepted: 24 April 2023
Published: 28 April 2023
© The Author(s) 2023.

Open Access This article is distributed under the terms and conditions of the Creative Commons Attribution (CC BY-NC-ND) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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