This chapter presents a comprehensive overview of well integrity remediation techniques aimed at restoring barrier functionality when failures occur during a well’s operational life. While preventative design and maintenance are foundational, issues such as sustained casing pressure (SCP), casing corrosion, cement sheath failure, packer leaks, and surface valve damage can still arise and compromise zonal isolation or environmental safety. Remediation becomes essential to extend the well’s productive life and mitigate operational and regulatory risks. The chapter begins with the remediation of cement sheath failures, emphasizing squeeze cementing as the most widely used method. Techniques such as continuous and hesitation squeeze methods are detailed, including slurry design considerations for penetration into micro-annuli and cracks. Case studies and laboratory data are used to highlight the effectiveness and limitations of various cement formulations, including microfine and chemical sealants. For casing leak repair, the chapter outlines the application of expandable casing patches and liners to seal localized damage or reinforce weakened sections. Straddle packer assemblies are described as temporary diagnostic tools, while full-length liners are recommended for extensive damage. Cement squeezing and epoxy-augmented expandable systems are also discussed. Leaks from downhole packers and tubing/casing connections are addressed through workovers involving component retrieval and replacement. Elastomeric expansion sleeves and internal sleeves may serve as patching alternatives where geometry permits. However, in many cases, major intervention is necessary due to limited access or component failure. Wellhead and valve leaks, though more accessible, still require precise isolation, pressure management, and seal replacement strategies. Temporary fixes such as sealant injection are discussed, alongside definitive solutions like gasket replacement, valve packing changeouts, and full valve replacements. Emphasis is placed on operational safety and verification during surface interventions. The final section outlines critical planning considerations for any remediation effort. These include accurate diagnostics, risk assessment, well kill procedures, equipment selection, fluid compatibility, verification testing, and economic analysis. Diagrams and field case data throughout the chapter illustrate the complexities of repair operations and reinforce the necessity for experienced personnel, proper tooling, and a systematic approach. Collectively, this chapter provides a field-ready guide to selecting and implementing effective remediation strategies tailored to the specific integrity challenge, supporting safe and sustainable well operation across its lifecycle.

Well Integrity Remediation Techniques

章节
发表日期：

2026年

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Ahmed Alsubaih,
Kamy Sepehrnoori

摘要

This chapter presents a comprehensive overview of well integrity remediation techniques aimed at restoring barrier functionality when failures occur during a well’s operational life. While preventative design and maintenance are foundational, issues such as sustained casing pressure (SCP), casing corrosion, cement sheath failure, packer leaks, and surface valve damage can still arise and compromise zonal isolation or environmental safety. Remediation becomes essential to extend the well’s productive life and mitigate operational and regulatory risks. The chapter begins with the remediation of cement sheath failures, emphasizing squeeze cementing as the most widely used method. Techniques such as continuous and hesitation squeeze methods are detailed, including slurry design considerations for penetration into micro-annuli and cracks. Case studies and laboratory data are used to highlight the effectiveness and limitations of various cement formulations, including microfine and chemical sealants. For casing leak repair, the chapter outlines the application of expandable casing patches and liners to seal localized damage or reinforce weakened sections. Straddle packer assemblies are described as temporary diagnostic tools, while full-length liners are recommended for extensive damage. Cement squeezing and epoxy-augmented expandable systems are also discussed. Leaks from downhole packers and tubing/casing connections are addressed through workovers involving component retrieval and replacement. Elastomeric expansion sleeves and internal sleeves may serve as patching alternatives where geometry permits. However, in many cases, major intervention is necessary due to limited access or component failure. Wellhead and valve leaks, though more accessible, still require precise isolation, pressure management, and seal replacement strategies. Temporary fixes such as sealant injection are discussed, alongside definitive solutions like gasket replacement, valve packing changeouts, and full valve replacements. Emphasis is placed on operational safety and verification during surface interventions. The final section outlines critical planning considerations for any remediation effort. These include accurate diagnostics, risk assessment, well kill procedures, equipment selection, fluid compatibility, verification testing, and economic analysis. Diagrams and field case data throughout the chapter illustrate the complexities of repair operations and reinforce the necessity for experienced personnel, proper tooling, and a systematic approach. Collectively, this chapter provides a field-ready guide to selecting and implementing effective remediation strategies tailored to the specific integrity challenge, supporting safe and sustainable well operation across its lifecycle.