US 12,220,787 B2
System and method for cutting of offshore structures
Mohd Izzat Mohd Thiyahuddin, Kuala Lumpur (MY)
Assigned to Petroliam Nasional Berhad (PETRONAS), Kuala Lumpur (MY)
Appl. No. 17/774,902
Filed by Petroliam Nasional Berhad (PETRONAS), Kuala Lumpur (MY)
PCT Filed Nov. 6, 2020, PCT No. PCT/MY2020/050136
§ 371(c)(1), (2) Date May 6, 2022,
PCT Pub. No. WO2021/091368, PCT Pub. Date May 14, 2021.
Claims priority of application No. MYPI2019006497 (MY), filed on Nov. 6, 2019.
Prior Publication US 2022/0388119 A1, Dec. 8, 2022
Int. Cl. E21B 29/12 (2006.01); B24C 1/04 (2006.01); B24C 3/32 (2006.01); B24C 9/00 (2006.01); E02B 17/00 (2006.01)
CPC B24C 1/045 (2013.01) [B24C 3/32 (2013.01); B24C 9/00 (2013.01); E02B 17/0034 (2013.01); E21B 29/12 (2013.01); E02B 2017/0052 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A system for cutting an underwater structure, the system comprising:
a cutting head, the cutting head comprising:
an abrasive water jetting nozzle;
a cryogenic nozzle;
the abrasive water jetting nozzle and the cryogenic nozzle mounted in fixed spaced relation;
the cutting head arranged to position tips of the abrasive water jetting nozzle and the cryogenic nozzle proximate to a cutting surface of the underwater structure, and arranged to form a cutting zone defined by the nozzle tips and the cutting surface; and
wherein a water repelling shield is located about said cutting zone and arranged to create arid conditions in the cutting zone.