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

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 ø165.1 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.