Key Technologies for Open-hole Sealing Disposal of Problematic Old Sidetracked Wells in Underground Gas Storage Conversion

doi:10.11885/j.issn.1674-5086.2025.12.02.06

Abstract

Abstract: The sealing of old wells is one of the core tasks in converting depleted oil and gas reservoirs into underground gas storage, and the quality of sealing directly determines the operational safety of the gas storage. Old wells with sidetracked open-hole structures, due to their complex processes and prominent construction difficulties, are faced with engineering bottlenecks such as difficulty in exploring sidetracked wellbores, poor stability of open-hole walls, and difficulty in ensuring sealing quality, thus becoming the key and difficult points in old well sealing projects. To solve these problems, by optimizing the direct reentry open-hole connection method and By-pass trajectory design, an integrated scheme based on passive magnetic guidance trajectory control and open-hole tracking has been constructed, which improves the wellbore trajectory control accuracy to the centimeter level. Meanwhile, by integrating the anti-collapse and lubricating drilling fluid system and high-efficiency cementing technology for complex wellbores, a key technical scheme for open-hole sealing of old sidetracked wells has been formed. This technology has been applied to 7 multi-well old wells with different well conditions in the Jidong Oilfield gas storage. All sidetracked open holes have been successfully re-entered and sealed, with a 95% pass rate of cementing quality in the open-hole sections, and the construction period is 30 d shorter than designed, meeting the requirements for optimal and rapid disposal of difficult old well plugging. This technology provides a mature technical means for the disposal of old sidetracked wells in gas storage and also offers practical experience and a reference for similar difficult well plugging projects in China.

Key words: underground gas storage, sidetracked open hole, connect, magnetic guidance, sealing of old wells

CLC Number:

TE358

WANG Jinzhong, HU Yiming, ZHENG Zhifeng, CHE Yang, JIN Xinwei, WAN Wenjin, QIAO Yu. Key Technologies for Open-hole Sealing Disposal of Problematic Old Sidetracked Wells in Underground Gas Storage Conversion[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2026, 48(4): 134-144.

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