Patent ID: 8701770

Claim:
A well system comprising: a main wellbore extending from a terranean surface toward a subterranean zone; a first lateral wellbore extending from the main wellbore into the subterranean zone; a second lateral wellbore extending from the main wellbore into the subterranean zone, the second lateral wellbore substantially parallel to the first lateral wellbore; a liner junction device in the main wellbore having a first leg extending into the first lateral wellbore and a second leg extending downhole in the main wellbore; a heated treatment fluid injection string that extends from in the main wellbore through the liner junction device and into the first lateral wellbore and terminates in the first lateral wellbore; and a seal in the first lateral wellbore that seals against flow toward the main wellbore in an annulus adjacent an outer surface of the heated treatment fluid injection string.