| 主权项 |
1. Method for removal of a hydrate plug (7) in a tube (92) in connection with a petroleum well (9) from a seabed (8), the petroleum well (9) is at the seabed (8) connected to a barrier (6) comprising a well valve (60) and an exhaust valve (61), the barrier (6) is connected to a wellhead (62); including a sluice (5) comprising a lower portion (51) extending from the wellhead (62) and to a Blow Out Preventer (63), and an upper portion (53) extending from the Blow Out Preventer (63) and to an upper pressure barrier (64), the sluice (5) further comprising a lower gate (52) and an upper gate (54); and further including a hydrate plug remover (2), where the hydrate plug remover (2) comprises a collecting container (21), said method comprising the following steps:
positioning the hydrate plug remover (2) in the sluice (5); filling the sluice (5) with a hydrate dissolving fluid; filling the collecting container (21), which is provided with a drill (4) driven by means of a motor (40) and a valve (3) in the lower end portion (20) of the collecting container (21), with hydrate dissolving fluid by circulating the hydrate dissolving fluid with the drill (4) through the valve (3); pressure testing the sluice (5); displacing the hydrate plug remover (2) to the hydrate plug (7) and letting the hydrate dissolving fluid flow towards the hydrate plug (7) through a circulation gate (22) in the upper end portion (29) of the collecting container (21); leading loosened hydrate from the hydrate plug (7) into the collecting container (21) via the valve (3); and displacing the hydrate plug remover (2) to the sluice (5) where the collecting container (21) is emptied of hydrate through the circulation gate (22) while the hydrate dissolving fluid is flowing into the collecting container (21) through the valve (3). |
