US 12,312,532 B2
Methods and systems for forming a solidified fluid barrier in a wellhead
Ahmed Abdullah Al-Ghamdi, Al Khobar (SA)
Assigned to Saudi Arabian Oil Company, Dhahran (SA)
Filed by Saudi Arabian Oil Company, Dhahran (SA)
Filed on Oct. 18, 2023, as Appl. No. 18/489,146.
Prior Publication US 2025/0129284 A1, Apr. 24, 2025
Int. Cl. C09K 8/44 (2006.01)
CPC C09K 8/44 (2013.01) [C09K 2208/10 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of forming a solidified fluid barrier in a wellhead, the method comprising:
injecting a wellhead sealing composition into a first flow line, a second flow line, a crown valve or combinations thereof of the wellhead, wherein the wellhead also comprises:
a wellbore casing comprising a fluid inlet and a fluid outlet,
a master valve coupled to the fluid outlet of the wellbore casing,
a fluid chamber fluidly connected to the master valve,
a first wing valve fluidly connected to the fluid chamber, wherein the first wing valve is also fluidly connected to the first flow line,
a second wing valve fluidly connected to the fluid chamber, wherein the second wing valve is also fluidly connected to the second flow line, and
the crown valve fluidly connected to the fluid chamber;
pumping the wellhead sealing composition into the fluid chamber, the wellhead sealing composition comprising water, a cyclodextrin selected from the group consisting of alpha-cyclodextrin, beta-cyclodextrin, gamma-cyclodextrin, or combinations thereof, and an azaarene selected from the group consisting of pyridine, 2-methylpyridine, 3-methylpyridine, 3,4-dimethylpyridine, 4-methylpyridine, or combinations thereof; and
heating the wellhead sealing composition to solidify the wellhead sealing composition in the fluid chamber of the wellhead, thereby forming the solidified fluid barrier.