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.