中国石化深层超深层油气井固井技术新进展与发展建议

Novel Advancements and Development Suggestions of Cementing Technologies for Deep and Ultra-Deep Wells of Sinopec

我国深层超深层油气井固井面临高温、高压、复杂介质和复杂工况等的挑战,水泥环长效密封完整性难以保证,常规固井技术与装置不能满足需求,亟需理论创新和研究井筒完整性固井新技术。近年来,中国石化通过科研攻关,完善了固井水泥环密封完整性理论体系,建立了复杂工况条件下的水泥环密封失效控制方法,研发了“防窜、防腐、防漏、防损伤”高性能水泥浆,研制了适用于深层复杂工况环境的固井尾管悬挂器、分级注水泥器及配套附件,提出了固井优化设计新方法,形成了深层复杂油气藏固井新技术。建议今后进一步完善特色水泥浆技术体系,研发绿色、智能环保材料,攻关固井技术信息化与智能化,持续推进基础理论研究,提高深层超深层复杂油气井固井质量。

In China,cementing for deep and ultra-deep oil and gas wells faces challenges,e.g.high temperature and pressure,complex formation media,and complex operation conditions,etc.The long-term seal integrity of cement sheath cannot be guaranteed,and conventional cementing technologies and equipment fail to meet the needs.Therefore,new cementing theories and technologies to ensure wellbore integrity are desperately needed.In recent years,Sinopec has improved the theory system of seal integrity of cement sheath for cementing,established seal failure control methodologies of cement sheath under complex operation conditions,and developed high-performance cement slurry with the advantage of anti-channeling,anti-corrosion,anti-leakage,and anti-damage through scientific research.In addition,liner hangers for cementing,multi-stage cement injectors,and associated accessories suitable for deep complex working conditions have been designed,new methods for optimizing cementing design have been established,and new cementing technologies for deep complex oil and gas reservoirs have come into being.In the future,it is suggested to further improve the technical system of characteristic cement slurries,develop green and intelligent environment-friendly materials,strengthen the informatization and intelligence of cementing technology,continuously promote basic theoretical research,and enhance the cementing quality of deep and ultra-deep complex oil and gas wells.