YEngineer
Petroleum
- Mar 6, 2007
- 18
At the end of an acid job, I might end up with about 200m of fluid column in tubing.
The well is 2900m TVD, there is a tubing extension joint on the way and tubing cannot be swabbed passed this point.
I have only some approximate reservoir pressure data and I am afraid that at the end of the job, the well might not be able to flow on its own. If this is the case, I am planning to use coil and N2 to unload the well.
Now, if the coil guys go too fast and with a lot more N2 as optimal, the friction losses in coil/tubing microannulus would be higher than reservoir pressure and I might end up pushing the fluid back into formation, instead of bringing it to surface.
Is there a rule of thumb, or any way how to calculate optimal N2 rate for unloading the well, without having to model it in Olga.
The well is 2900m TVD, there is a tubing extension joint on the way and tubing cannot be swabbed passed this point.
I have only some approximate reservoir pressure data and I am afraid that at the end of the job, the well might not be able to flow on its own. If this is the case, I am planning to use coil and N2 to unload the well.
Now, if the coil guys go too fast and with a lot more N2 as optimal, the friction losses in coil/tubing microannulus would be higher than reservoir pressure and I might end up pushing the fluid back into formation, instead of bringing it to surface.
Is there a rule of thumb, or any way how to calculate optimal N2 rate for unloading the well, without having to model it in Olga.
