Threaded and Coupled Connection

A method, comprising:

• connecting a first pipe to a collar, the first pipe comprising a first external thread and a first annular lip residing at an end of the first pipe, the collar comprising a first internal thread and a second internal thread with a bore residing between the first and second internal threads, wherein connecting the first pipe to the collar comprises threadedly coupling the first external thread to the first internal thread of the collar such that a seal surface of the first annular lip contacts the bore of the collar to form a first metal-to-metal seal;
• connecting a second pipe to the collar, the second pipe comprising a second external thread and a second annular lip residing at an end of the second pipe, wherein connecting the second pipe to the collar comprises threadedly coupling the second external thread to the second internal thread of the collar such that a seal surface of the second annular lip contacts the bore of the collar to form a second metal-to-metal seal;
• and
• pressurizing the first pipe and the second pipe to apply fluid pressure to the first and second annular lips, energizing the first and second metal-to-metal seals and increasing a contact pressure of the first and second metal-to-metal seals.