高性能裸眼封隔器关键机构测试及优化

Test and Optimization of Key Mechanism of High-Performance Openhole Packer

国内对深层、超深层含硫裸眼封隔器的研究设计不能完全满足深层井现场施工需要。为此,研制了适应井径165.1 mm的高性能压缩式裸眼封隔器,开展了该封隔器保持坐封力机构、胶筒间的接触角以及护肩机构分瓣数等对胶筒密封能力的室内试验评价及关键机构的优化,分析了护肩保护及棘齿机构坐封力保持中存在的双向密封可靠性低和保持坐封力差的问题,优化了护肩及棘齿参数,并进行了现场试验。现场试验结果表明:研制的压缩式裸眼封隔器采用碗状护肩保护及独有的保持坐封力机构,在套管内径180 mm和温度150℃时,双向密封承压均达到65 MPa;该封隔器在高温高压气井中具有良好的通过性与适应性,满足复杂井况要求;解决了高温、高压、含硫及钻井液环境等复杂井况下工具稳定性差的问题。研究结论可为复杂完井工具的研发提供技术支撑。

The domestic research and design of open-hole packers for deep and ultra-deep sulfur-containing wells cannot fully meet the needs of the operation in deep wells.To address the problem,a high-performance compression open-hole packer adapted to the well diameter of165.1 mm is developed.The influence of mechanism for maintaining the setting force,the contact angle between the packer rubbers,and the number of splits of the shoulder protect mechanism pair on the packer rubber sealing performance is tested indoor.The shoulder protector and ratchet parameters are optimized,and field tests are carried out.The test results show that the developed compression open-hole packer with bowl-shaped shoulder protector and a unique mechanism to maintain the setting force could allow sealing pressure of 65 MPa in the 180 mm I.D.casing at 150℃.The packer has good passability and adaptability in high-temperature and high-pressure gas wells,and meets the requirements of complex well conditions.It addresses the problem of poor tool stability under complex well conditions such as high temperature,high pressure,sulfur-containing and mud environment.The study can provide technical support for the development of complex completion tools.