Patent ID: 11913300
Assignee: SAUDI ARABIAN OIL COMPANY
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 15:
16. A wellbore chemical injection system comprising:
a chemical reservoir storing chemicals to be injected into a wellbore formed in a subterranean zone through a wellhead installed at a surface of the wellbore, the wellhead comprising a tubing spool having a tubing spool inlet configured to receive the chemicals from the chemical reservoir;
a flowline fluidically coupled to the chemical reservoir, the flowline configured to flow the chemicals from the chemical reservoir to the tubing spool inlet; and
a wellbore chemical injection assembly comprising:
an extension flange comprising a first end fluidically coupled to the tubing spool inlet and a second end opposite the first end, the second end fluidically coupled to the flowline, the extension flange defining a flange bore between the first end and the second end;
a mandrel coupled to the extension flange, the mandrel residing partially within and partially outside the flange bore, the mandrel defining an interior opening spanning an axial length of the mandrel;
outer coupling threads formed on an outer surface of a portion of the mandrel residing outside the flange bore, the outer coupling threads configured to removably mate with counterpart threads in the tubing spool inlet;
inner coupling threads formed on an inner surface of a portion of the interior opening; and
a valve assembly removably seated in the interior opening, the valve assembly comprising valve coupling threads on an outer surface of the valve assembly, the valve coupling threads configured to removably mate with the inner coupling threads formed on the inner surface of the portion of the interior opening.