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Original Paper | Open Access

Research on thermal insulation materials properties under HTHP conditions for deep oil and gas reservoir rock ITP-Coring

Zhi-Qiang Hea, He-Ping Xiea,b, Ling Chena,c( ), Jian-Ping Yanga,b,d, Bo Yua,b,c, Zi-Jie Weia,b, Ming-Zhong Gaoa,b
State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, Sichuan, China
Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization, Institute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, 518060, Guangdong, China
School of Mechanical Engineering, Sichuan University, Chengdu, 610065, Sichuan, China
College of Polymer Science and Engineering, Sichuan University, Chengdu, 610065, Sichuan, China

Edited by Jia-Jia Fei

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Abstract

Deep oil and gas reservoirs are under high-temperature conditions, but traditional coring methods do not consider temperature-preserved measures and ignore the influence of temperature on rock porosity and permeability, resulting in distorted resource assessments. The development of in situ temperature-preserved coring (ITP-Coring) technology for deep reservoir rock is urgent, and thermal insulation materials are key. Therefore, hollow glass microsphere/epoxy resin thermal insulation materials (HGM/EP materials) were proposed as thermal insulation materials. The materials properties under coupled high-temperature and high-pressure (HTHP) conditions were tested. The results indicated that high pressures led to HGM destruction and that the materials water absorption significantly increased; additionally, increasing temperature accelerated the process. High temperatures directly caused the thermal conductivity of the materials to increase; additionally, the thermal conduction and convection of water caused by high pressures led to an exponential increase in the thermal conductivity. High temperatures weakened the matrix, and high pressures destroyed the HGM, which resulted in a decrease in the tensile mechanical properties of the materials. The materials entered the high elastic state at 150 °C, and the mechanical properties were weakened more obviously, while the pressure led to a significant effect when the water absorption was above 10%. Meanwhile, the tensile strength/strain were 13.62 MPa/1.3% and 6.09 MPa/0.86% at 100 °C and 100 MPa, respectively, which meet the application requirements of the self-designed coring device. Finally, K46-f40 and K46-f50 HGM/EP materials were proven to be suitable for ITP-Coring under coupled conditions below 100 °C and 100 MPa. To further improve the materials properties, the interface layer and EP matrix should be optimized. The results can provide references for the optimization and engineering application of materials and thus technical support for deep oil and gas resource development.

Keywords

Deep oil and gas reservoir rockIn situ temperature-preserved coring (ITP-Coring)Hollow glass microsphere/epoxy resin thermal insulation materials (HGM/EP materials)High-temperature and high-pressure (HTHP)Physical and mechanical properties

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Petroleum Science
Volume 21 Issue 4,
August 2024
Pages 2625-2637
DOI: 10.1016/j.petsci.2024.03.005
Cite this article:
He Z-Q, Xie H-P, Chen L, et al. Research on thermal insulation materials properties under HTHP conditions for deep oil and gas reservoir rock ITP-Coring. Petroleum Science, 2024, 21(4): 2625-2637. https://doi.org/10.1016/j.petsci.2024.03.005

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Received: 13 August 2023
Revised: 12 March 2024
Accepted: 12 March 2024
Published: 20 March 2024
© 2024 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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