US 12,331,615 B2
Wellhead back-pressure valve insertion
Hussain A. Al Sultan, AlHasa (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Sep. 8, 2023, as Appl. No. 18/463,957.
Prior Publication US 2025/0084723 A1, Mar. 13, 2025
Int. Cl. E21B 34/02 (2006.01)
CPC E21B 34/02 (2013.01) 16 Claims
OG exemplary drawing
 
8. A method comprising:
attaching, to a crown top of a wellhead of a well, an insertion tool assembly for disposing a back-pressure valve (BPV) in a tubing hanger installed in a wellhead, the insertion tool assembly comprising:
a lubricator comprising a rod slidably disposed therein, wherein the BPV is releasably attached to a distal end of the rod; and
a tubular adapter comprising:
a main body with a top end and a bottom end and a central bore therethrough, the top end detachably attached to the lubricator and the bottom end configured to be detachably attached to the crown of the wellhead, wherein an internal diameter of the central bore is greater than an external diameter of the BPV; and
a kill fluid port disposed through a side-wall of the main body;
extending the rod and thereby passing the BPV through the tubular adapter and into the wellhead through the crown top; and
in response to a well control event indication, injecting a kill fluid into the kill fluid port, thereby flowing kill fluid through the crown top into the well, wherein the insertion tool assembly is configured such that injection of a fluid into the kill fluid line port from the fluid line dislodges debris within the central bore and injection of the fluid occurs uphole of the BPV while the BPV is fully retracted into the tubular adapter.