anji71
Chemical
- Jan 4, 2005
- 12
A long one i'm afraid...
I'm trying to inject corrosion inhibitor downhole to each subsea well. The downhole pressure of where i'm injecting to is 60bar u/s of a ESP pump. I have a pump topsides where the chemical is distributed to a subsea flow distribution panel to inject to individual wells via controlled Amflow valves( valve provides constant,pressure independant flow of injection flow).
In theory as long as he pressure on the pump topsides(pressure controlled via a back pressure regulator) exceeds the downhole pressure( set at 80 bar) then i should be able to inject the required flows to each well. However on some of the wells I get a back pressure of 40 bar on the indicators on distribution panel, and some with 0 pressure although all are at 60 bar downhole pressures.
The problem is some of the injection points at the panel lose some flow completely,then re-appear with no known reason.
I find that if i set one of the rates on the amflow valve too high( 5L/min as opposed to 2L/min) then this can reduced the flow on one of the other injection points even though they are completely independant.
Even though the pump is set to deliver over 500mls/min the actual daily injection rate is only 250ml/min, with the flow meters on the distibution indicating at the correct treat rate volumes.
I'm trying to inject corrosion inhibitor downhole to each subsea well. The downhole pressure of where i'm injecting to is 60bar u/s of a ESP pump. I have a pump topsides where the chemical is distributed to a subsea flow distribution panel to inject to individual wells via controlled Amflow valves( valve provides constant,pressure independant flow of injection flow).
In theory as long as he pressure on the pump topsides(pressure controlled via a back pressure regulator) exceeds the downhole pressure( set at 80 bar) then i should be able to inject the required flows to each well. However on some of the wells I get a back pressure of 40 bar on the indicators on distribution panel, and some with 0 pressure although all are at 60 bar downhole pressures.
The problem is some of the injection points at the panel lose some flow completely,then re-appear with no known reason.
I find that if i set one of the rates on the amflow valve too high( 5L/min as opposed to 2L/min) then this can reduced the flow on one of the other injection points even though they are completely independant.
Even though the pump is set to deliver over 500mls/min the actual daily injection rate is only 250ml/min, with the flow meters on the distibution indicating at the correct treat rate volumes.