Research on the sealing performance of premium connections under multiple load

Abstract The growing harshness of downhole conditions poses a severe challenge to the sealing of premium connectionss. Using a Φ88.9mm×6.45mm P110 premium connections as a case, this paper analyzes the stress values at the sealing face, shoulder, and thread of premium connectionss with cone-cone and sphere-cone sealing structures under combined loads, and delves into their sealing performance under these loads. The findings indicate that in cone-cone connections, the sealing face is the primary actor, while the shoulder offers auxiliary support. The overall thread structure is integral and ensures good sealing. As for sphere-cone connections, an increase in axial tension causes slight movement between the coupling and tubing. The stress value at the middle thread stabilizes, the entire thread is structurally sound, and the thread connection is effective.