Treating method and design method for tubular connections
View Patent ↗A method of treating a threaded connection that includes determining a treating time sufficient to form a thickness of a hopeite coating, coating at least a portion of the threaded connection with phosphating compound for a period of time sufficient to form the thickness of the hopeite coating is described.
1. A threaded connection for oilfield tubulars, comprising:
a metal-to-metal seal, wherein the metal-to-metal seal has a diametral interference at a prescribed make-up between 0.0025″ and 0.0045″ per inch of nominal diameter of the oilfield tubulars; and
a zinc phosphate coating, wherein the zinc phosphate coating comprises particles having an average particle size of at least about 50 microns.
2. The threaded connection of claim 1 , wherein the metal-to-metal seal has a seal angle of less than 10 degrees.
3. The threaded connection of claim 1 , wherein the threaded connection has a thread pitch between 2 threads per inch and 6 threads per inch.
4. The threaded connection of claim 1 , wherein the oilfield tubulars have a nominal diameter of equal to or greater than 9.375″.
5. The threaded connection of claim 1 , wherein the zinc phosphate coating has a P-Ratio less than or equal to 0.6.
6. The threaded connection of claim 1 , wherein the zinc phosphate coating has a P-Ratio less than or equal to 0.4.
7. The threaded connection of claim 1 , wherein the average particle size ranges from about 50 to 100 microns.