Oil Well Pipe Screw Joint Seal Structure With Minimum Thread Length

The patent applies parameter changes by establishing a mathematical relationship (Expression 1) that defines the minimum necessary screw length based on multiple parameters including pipe thickness, pipe outer diameter, effective screw length ratio, and average screw diameter. This allows optimization of screw length by adjusting these parameters to achieve the required shear fracture strength while minimizing processing and construction time.

The patent implements partial action by determining that only the minimum necessary screw length (not the maximum possible length) is required to achieve sufficient shear fracture strength. This avoids the excessive action of using unnecessarily long screws, thereby reducing processing time and construction time while still meeting strength requirements.

The patent uses parameter changes to establish a precise mathematical formula (Expression 1) that calculates the minimum screw length required to maintain sufficient shear fracture strength. This enables productivity improvement by avoiding excessive screw length while ensuring strength requirements are met through optimized parameter selection.

The patent implements feedback by incorporating the joint efficiency factor in Expression 1, which accounts for the actual performance of the joint relative to the pipe material. This feedback mechanism ensures that the calculated minimum screw length adequately maintains shear fracture strength while optimizing for reduced processing time.