Study on Anti-Corrosion Coating and Membrane Technology for Old Well Casing Tubing in Changqing Oilfield

GUO Gang, WU Chunsheng, LYU Feng, LI Kai, WANG Shangwei

doi:10.16577/j.issn.1001-1560.2025.0034

Materials Protection >

2025 , Vol. 58 >Issue 2: 150 - 155

DOI: https://doi.org/10.16577/j.issn.1001-1560.2025.0034

Study on Anti-Corrosion Coating and Membrane Technology for Old Well Casing Tubing in Changqing Oilfield

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(National Engineering Laboratory for Low-Permeability Oil ＆ Gas Exploration and Development，Oil ＆ Gas Process Research Institute of Changqing Oilfield Company， CNPC， Xi’an 710018， China)

LYU Feng(1997-)，Master，Engineer，Research Focus:Scientific Research and Application Work in the Field of Oil and Gas Field Chemistry， E-mail:lvfeng1_cq＠petrochina.com.cn

Received date: 2024-05-06

Revised date: 2024-10-15

Accepted date: 2024-10-18

Online published: 2025-03-21

Supported by

Major Science and Technology Special Project of PetroChina(2016E-0510)

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Abstract

The single internal anti-corrosion technology in the key corrosion areas of Changqing Oilfield cannot meet the needs of the field.In this study， the liquid epoxy coating and intelligent downhole coating and film sticking device for the anti-corrosion technology of coating and film sticking anti-corrosion technology for old wellbore casing in Changqing oilfield were introduced， the corresponding surface and downhole joint film sticking construction technology were explored， and certain effects were obtained in the field corrosion protection experiment.Results showed that the coating hardness was greater than 6H， the thickness exceeded 400 μm， the adhesion grade was 4A， and it exhibited resistance to chemical medium corrosion， demonstrating excellent field application performance.The designed intelligent downhole coating and film sticking device， when applied in the field， achieved the design requirement of spraying 220 m in 80 min with a coating thickness of up to 0.7 mm，as verified by comparing underground television camera video data before and after film sticking.Furthermore， the tool allowed for ground control over the coating speed， precise positioning of the coating depth， and coating thickness.This provides a technological reference and a reliable technical path for the corrosion protection of old wellbore casings and downhole repair processes in Changqing Oilfield.

Key words： liquid epoxy coating; downhole coating and film sticking; wellbore casing; field repair

Cite this article

GUO Gang, WU Chunsheng, LYU Feng, LI Kai, WANG Shangwei . Study on Anti-Corrosion Coating and Membrane Technology for Old Well Casing Tubing in Changqing Oilfield[J]. Materials Protection, 2025 , 58(2) : 150 -155 . DOI: 10.16577/j.issn.1001-1560.2025.0034

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