ASSEMBLING A PERFORATING GUN STRING WITHIN A CASING STRING

摘要

Methods are disclosed for assembling a perforating gun string in a wellbore. One method includes assembling a first perforating gun assembly into a lubricator, connecting the lubricator to a blowout preventer coupled to a wellhead, lowering the first perforating gun assembly on a conveyance into the blowout preventer, engaging the first perforating gun assembly with sealing rams of the blowout preventer, detaching the conveyance from the first perforating gun assembly and removing the conveyance from the blowout preventer, disconnecting the lubricator from the blowout preventer, assembling a second perforating gun assembly into the lubricator, re-connecting the lubricator to the blowout preventer, lowering the second perforating gun assembly into the blowout preventer and attaching the second perforating gun assembly to the first perforating gun assembly, and repeating the process to form a perforating gun string.

主权项

1. A method comprising:
(a) assembling a first perforating gun assembly into a lubricator, the first perforating gun assembly including at least one perforating gun cluster, at least one extended delay assembly, and a first subassembly; (b) connecting the lubricator with the first perforating gun assembly disposed therein to a blowout preventer coupled to a wellhead; (c) lowering the first perforating gun assembly on a conveyance into at least a portion of the blowout preventer; (d) engaging the first subassembly with sealing rams included in the blowout preventer; (e) detaching the conveyance from the first perforating gun assembly and removing the conveyance from the blowout preventer; (f) disconnecting the lubricator from the blowout preventer; (g) assembling a second perforating gun assembly into the lubricator, the second perforating gun assembly including at least one perforating gun cluster, at least one extended delay assembly, and a second subassembly; (h) connecting the lubricator with the second perforating gun assembly disposed therein to the blowout preventer; (i) lowering the second perforating gun assembly into the blowout preventer and attaching the second perforating gun assembly to the first perforating gun assembly, thereby forming a portion of a perforating gun string; (j) disengaging the sealing rams from the first subassembly; (k) lowering the portion of the perforating gun string through at least a portion of the blowout preventer; (l) engaging the second subassembly with the sealing rams of the blowout preventer; and (m) detaching the conveyance from the portion of the perforating gun string.