Hydrates
Hydrates
(OP)
Hi all,
Looking at the gas lift on a process and wondering about hydrates.
The gas goes through dehydration before final compression where it is moved down to lift other wells.
By the time the gas gets to the wells it has cooled down to around 7/8oC which bring the gas into its hydrate zone. The platform currently inject methanol into the lift gas in fear of hydrates but this is the 1st time I have ever seen this.
Surely with all gas lifted wells by the time the gas gets subsea it must have cooled to within its hydrate zone? Do most platforms have methanol in the lift gas?
Thanks in advance
Looking at the gas lift on a process and wondering about hydrates.
The gas goes through dehydration before final compression where it is moved down to lift other wells.
By the time the gas gets to the wells it has cooled down to around 7/8oC which bring the gas into its hydrate zone. The platform currently inject methanol into the lift gas in fear of hydrates but this is the 1st time I have ever seen this.
Surely with all gas lifted wells by the time the gas gets subsea it must have cooled to within its hydrate zone? Do most platforms have methanol in the lift gas?
Thanks in advance





RE: Hydrates
David
RE: Hydrates
http://hydrates.mines.edu/CHR/Pub-Theses.html
Think about the gas lift gas as it returns the fluids from the well, those fluids are loaded with water. The methanol is not to keep the lift gas going into the well from freezing, its the gas and fluids coming out that will have the highest peobability of hydrate formation
RE: Hydrates
What I cant understand is how all platforms dont need to inject methanol because the gas lift before entering the production fluids will be at high pressure and low temperature... unless all the water has been removed in dehydration then surely everyone will be at risk?
RE: Hydrates
RE: Hydrates
I thought the whole point of a dehydration system would be to eliminate the risk of hydrate formation, however dehydration and inhibition is now used.