API RP 19G13 Sept. 22, 2009 Page 2
API RP 19G13
High Pressure and Sub-Sea Gas Lift
Meeting
Meeting Venue
Location:
ConocoPhillips
Houston, Texas
Teleconference (for those who can’t participate in person):
Date and Time:
Tuesday, Sept. 22, 2009
9:00 am
Meeting Staff:
Host: Tom Nations, ConocoPhillips
Work Group Chair: Wayne Mabry, Schlumberger
Food and Beverage:
Lunch, at 12:00, with members of API RP 19G12 Work Group
Coffee, soft drinks
Agenda
Attendees: Sept. 22, 2009· Bill Begnaud BHP Billiton (By Telephone)
· Cleon Dunham Oilfield Automation Consulting
· Mike Johnson ExxonMobil
· Stan Groff Arctic Lift
· Wayne Mabry Schlumberger
· Tom Nations ConocoPhillips
· Tom Norland PTC (By Telephone)
· Ian Schuur Schlumberger
1. Welcome, Safety Briefing
Minutes: Sept. 22, 2009· Tom Nations gave a safety briefing.
2. Introductions
Minutes: Sept. 22, 2009· The attendees introduced themselves.
3. Initial Discussions
Minutes: Sept. 22, 2009· There was an initial discussion of what is meant by “high pressure” gas-lift.
· High pressure will be defined as 2,220 psi (15,306 kPa) and above. This is based on a 900 ANSI, B16.5 flange rating.
· High pressure will be in a range of from 2,220 to 5,000 psi.
· The ultra high pressure range will be above 5,000 psi.
· Tom Norland will define the ANSI flange ratings that are used in the North Sea.
· Olga and Prosper are being used to model pressure fluctuations in gas-lift systems. We want to avoid overlap with API 19G11, which is the RP on dynamic simulation.
· The document needs to address equipment in the wells, the flowlines, risers, etc.
· We can mention such topics as gas-lift in conjunction with ESP’s, etc. but not go into detail.
· We need to take into consideration the similarities and differences between land-based, dry tree, and sub-sea gas-lift designs.
4. Look at Work Prepared by Keith Fangmeier.
Minutes: Sept. 22, 2009· Keith Fangmeier prepared an outline for the section on dry tree gas-lift designs.
· We read through Keith’s document.
· We edited the document as necessary. Wayne Mabry has the edited document.
· Some of the edits are summarized below.
· Fixed Conventional Platforms
o Gas-lift distribution:
- Inject gas to the downhole well in a separate line, or in the annulus.
- Consider issue of the riser – secondary containment
- Flow assurance considerations
§ Hydrates
§ Gas-lift dehydration
§ Scale
§ Solids deposition
§ Erosion
§ Corrosion
§ Joules-Thompson (freezing)
o Surface equipment
- Gas-lift distribution
- Compression
- Gas-lift from a distant source – e.g. another platform with long injection lines
- Metering and control systems
o Other API documents to be used as reference:
- API RP 11V8 – Systems
- API RP 11V5 – Operations – dehydration
o Downhole considerations
- Use of pack-offs
- Discussion of location of top valve and its affect on initial well unloading
- Gas passage considerations – what algorithms can be used?
§ Follow ISO 17078-2, Annex H (based on RP 11V2 calculation method)
- Valve integrity
§ Use WRO534, ISO 17078-2, ISO 14310 V1 leak rate
o Pressure isolation of valve in mandrel – to be discussed later
- Consider redundant check systems
- Shear activation mechanisms
- Seal system
- Flapper valve system
- Surface control actuated valve
o Calculating gas-lift injection rates/volumes
- Temperature issues at start-up
- Sea bed temperature issues
- Issues for flow rate calculations
- Issues with re-saturation of under-saturated oils
- Flow regime issues – what flow regime(s) exist
- Deviation effects on stability
- Design valve/orifice for critical flow through the valve
o Scale and asphaltines considerations
o Paraffin issues – less likely at higher temperatures
o Intervention with electric line and coiled tubing
· This information will be sent to the authors of the other sections; they can use much of this information.
5. Review action items from last meeting
Minutes: Sept. 22, 2009· Other people need to be added to the team:
o A person from StatOil will be included on the team.
o A person from Norway will be included on the team.
o Others need to contact their potential contact persons that were defined last time.
· We need to include Recommended Practices for both high pressure and normal pressure sub-sea gas-lift in the document.
o There are some issues that are unique to normal pressure sub-sea systems.
o Mike Johnson will work on this.
· Ian Schuur will work with Tom Nations on land-based high pressure gas-lift.
· We reviewed the actions from last time:
o Teams are formed on Land-Based (Tom Nations), Dry Tree (Keith Fangmeier), and Sub-Sea (Tom Norland) gas-lift.
o Mike Johnson will work on the Sub-Sea team for normal pressure sub-sea gas-lift.
o Stan Groff will work with Tom Nations on Land-Based gas-lift.
6. Any other business
Minutes: Sept. 22, 2009· There was no other business.
· Cleon Dunham and Wayne Mabry will update the list of team members with both names and e-mail addresses.
7. Next meeting
Minutes: Sept. 22, 2009· The next meeting will be Tuesday, Dec. 1, 2009, at ConocoPhillips in West Houston, at 1:30 pm.
8. Adjourn
Minutes: Jul Sept. 22, 2009y 15, 2009· The meeting was adjourned at 11:55 am.