Tuesday, December 19, 2017

Typical Gas Well flow control.

Typical Gas Well flow control.




Since the Automation has been increased in upstream industry of oil and gas in last 2 decades, Now Control schemes on the automated choke valves are also getting sophisticated. Automation certainly have tremendous advantage over manual operation but have to be careful for operation and control strategy adopted for the same.
I was doing the research on gas well control and I thought to give a synopsis for the same.Typical gas Control valve Control Scheme may be look like below: 


I would like to give you a quick and easy to remember Summary of various Controllers / Constraint on the gas Line Choke valve.

1. Demand From the master load controller (Asking For how much gas the plant can handle to process in the separator)
2. High Pressure Controller: CONTROL The Pressure before the HIPPS valve activated for safeguarding of flow line.
3. High Flow Controller: Flow should not be more than the pipeline can handle even though the terminal asking for more.
4. Low Flow Controller: To avoid Liquid Loading the Well tubing
5. High Erosion velocity Controller: To Avoid Erosion in Well Tubing / Annulus
6. Low pressure Controller: To avoid Reverse Flow from other wells and In case of tube rupture etc.
The above control or constraints to flow are super set and applicable constraints to be chosen as per the applicability to your system.