Additive manufacture of wellbore tubulars

Non-transitory computer readable storage medium comprising program instructions stored thereon that are executable by a processor to cause the following for casing a wellbore of a hydrocarbon well:

• conducting a downhole casing operation comprising:
• operating a casing print head disposed in a wellbore of a hydrocarbon well to eject casing material to form a casing tubular in the wellbore, the casing print head comprising a row of nozzles, the row of nozzles comprising a first subset of nozzles configured to eject casing liner material, a second subset of nozzles configured to eject casing material, and a third subset of nozzles configured to eject disposable material;
• operating the casing print head such that the casing print head rotates about a longitudinal axis of the wellbore and advances along the length of the wellbore, and the second subset of nozzles ejects the casing liner material into an annular region located between the casing tubular and a wall of the wellbore to form a casing liner in the annular region formed of the casing liner material, such that the casing tubular and the casing liner are simultaneously deposited to form a casing of the wellbore;
• forming a perforation in the casing, forming the perforation in the casing comprising operating the casing print head to form a contiguous void extending radially across the casing tubular and the casing liner, wherein operating the casing print head to form a contiguous void extending radially across the casing tubular and the casing liner comprises operating the casing print head such that the third subset of nozzles ejects the disposable material to define the contiguous void extending radially across the casing tubular and the casing liner;
• and
• performing a perforation operation comprising removing the disposable material.