API RP 19G13 Feb. 5, 2010 Page 9
API RP 19G13
High Pressure and Sub-Sea Gas Lift
Work Group Meeting --- Agenda and Minutes
Meeting Venue
Location:
Schlumberger
Dairy Ashford
Houston, TX77079
Date and Time:
Tuesday, May 11, 2010
8:00 – 4:00 pm
Meeting Staff:
Host: Wayne Mabry, Schlumberger
Work Group Chair: Wayne Mabry, Schlumberger
RSVP:
· People RSVP’d to Wayne Mabry
Conference Call Instructions:
· Conference call· 1-719-387-5500
· Code 540866
Food and Beverage:
Lunch, at 12:00, at Schlumberger
Coffee, soft drinks at breaks
Attendees
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
Attendees: Dec. 1, 2009
· Alan Brodie PTC
· Jorn Carlsen Statoil
· Cleon Dunham Oilfield Automation Consulting
· Keith Fangmeier Hess
· Wayne Mabry Schlumberger
· Tom Nations ConocoPhillips
· Tom Norland PTC
· Glenn Toney PTC
Attendees: Feb. 5,2010
· Sven Aarrestad IRIS
· Tiago Barbosa Petrobras
· Fortune Bikoro Petroleum Consulting Limited
· Alan Brodie PTC
· Jorn Carlsen Statoil
· Ken Decker Decker Tech.
· Cleon Dunham Oilfield Automation
· Stan Groff Arctic Lift
· Atin Halal Parveen
· Jim Holt Baker Oil Tools
· Mike Johnson ExxonMobil
· Juan Carlos Mantecon SPT Group
· John Martinez Production Associates
· Tom Nations ConocoPhillips
· Tom Norland PTC
· Espen Osaland Aker Well Services
· Ron Schmidt Weatherford
· Britt Sliper Statoil
· Glenn Toney PTC
Attendees: Feb. 5,2010
· Alan Brodie PTC (By teleconference)
· Cleon Dunham Oilfield Automation
· Keith Fangmeier Hess Corporation
· Jim Hall Dubai Petroleum Company (Seconded from Shell)
· Jim Holt Baker Oil Tools
· Wayne Mabry Schlumberger
· Michael Romer ExxonMobil
· Britt Sliper Statoil
· Glenn Toney PTC
Agenda
1. Welcome, Safety Briefing
Wayne Mabry will give a safety briefing.
Minutes: May 11, 2010· Wayne Mabry gave a safety briefing.
2. Introductions
Wayne Mabry, Work Group Chair, will lead introductions of each meeting attendee.
Minutes: Dec. 1, 2009· Attendees introduced themselves, their companies, and their role on the team.
· We accepted the minutes of the last meeting.
Minutes: Feb. 5, 2010
· The attendees of the meeting introduced themselves and their interest in deep water, sub-sea.
Minutes: May 11, 2010
· The attendees of the meeting introduced themselves and their interest in deep water, sub-sea.
3. Initial Discussions
The discussion that was held at the Sept. 22, 2009 meeting is shown below. Additional general discussion can take place at this time, if necessary.
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.
Minutes: Dec. 1, 2009
The following discussion was held.
· Wayne Mabry described why “high pressure” was chosen to be 2220 psi (15,306 kPa). This is the pressure limit for ASA 900 flanges.
· The standard high pressure flange rating used in the North Sea is 5,000 psi.
· Wayne Mabry described the API “adopt back“ process to accept ISO documents in API. ISO will continue to control the actual documents.
· We need to ask ISO Work Group 4 to update ISO 17078-2 to handle testing of high pressure gas-lift valves. Wayne Mabry and Jorn Carlsen will address this.
· There was a big discussion about the focus of this recommended practice. Should we recommend using high enough pressure to have only one injection point in sub-sea gas-lift wells, or should we also consider the possibility of using unloading valves. We reached consensus that it is appropriate to acknowledge both approaches.
· There was another discussion about the scope of the effort. Should we address all issues associated with sub-sea gas-lift, from the wellbore/formation interface to the equipment on the surface, or only those issues associated with the wellbore itself. We reached consensus that we should address the entire system, but need to be careful not to duplicate efforts with any existing documents. Thus the next three points. We agreed that some issues, such as the use of gas-lift to supplement or back-up ESP operations can be mentioned very briefly, without dwelling on them to any extent.
· We want to have a drawing or drawings that depict a generic sub-sea system and all of the various documents and issues that impinge upon it.
· We will ask Roland Goodman, our API representative, to find the API “picture” of a sub-sea system that shows all of the relative documents.
· Cleon Dunham will develop a list of existing API and ISO documents that address various issues associated with sub-sea operations. Form this; we will highlight the issues associated with gas-lift that are not covered by existing documents.
Minutes: Feb. 5, 2010
· John Martinez recommended that we change the pressure limit for high pressure gas-lift to 2,160 psi, as this is based on using stainless steel.
· Jorn Carlsen suggested that this be 2,000 psi, to have a round number.
· This is the pressure as it leaves the compressor discharge.
· The Work Group agrees to define 2,000 psi and above as the high pressure limit and above 5,000 psi as the ultra high pressure limit.
· These values are pertinent at 100 oF.
· We are defining pressure limits (at temperature) for a high pressure gas-lift system so all components of the system must be considered.
· We need to be aware that the pressure downhole may be much higher than the compressor discharge pressure due to gas density.
Minutes: May 11, 2010
· Document prepared by Mike Johnson, Alan Brodie
- Mike Johnson and Alan Brodie submitted a document presenting an Outline for High Pressure and Normal Pressure Sub-Sea.
- They met in Paris to prepare this document.
- Their presentation will be added to the API RP 19G13 file.
- This has been reviewed by PTC, ExxonMobil, Statoil, and Petrobras.
- There was discussion about the potential title of the document – should it be “Sub-Sea and High Cost of Intervention Gas-Lift?”
- Alan Brodie went through the presentation they prepared.
- Issues discussed included:
§ Single point injection.
§ Joule Thompson cooling.
§ Gas-lift valve reliability. These need to be addressed in ISO 17078-2 and API 19G2, when API “adopts back” the ISO document. Current documents that address valve testing and performance include API RP 11V1, API 11V2, ISO 17078-2, Shell, Statoil, and Petrobras.
§ Flow strategy.
§ Dynamic modeling.
§ Redundancy and reliability assurance.
§ Data acquisition systems.
§ Control systems.
§ System modeling. Static and dynamic.
§ PVT issues when go sub-sea. Hydrates, asphaltines.
- We agree with including concerns with reliability in the document.
· Comments by Petrobras
- We next went through comments by Petrobras.
- Issues: reliability of unloading valves.
- Compressor reliability.
- Must include cost of manifold.
- Many uncertainties when trying to design single point injection.
- Flow stability.
- What does the Petrobras “bonus question” mean? What does un-pressurization of the annulus mean?
· Document from Statoil on ISO Standards associated with Sub-Sea
- We next went through a document from Statoil on ISO Standards for use in the oil industry.
- This addresses ISO documents written on sub-sea.
- We can place this on the web site.
- We will want to place this in the document (with permission).
4. Review Draft Version of API RP 19G13 Document
Information which has been provided by Keith Fangmeier for Section 2.0, Deep Water, Dry Tree, has been incorporated into the Master document. At the meeting on Sept. 22, we made a number of comments on the outline for Section 2.0. These need to be reflected in the Master document.
The lead author(s) of each of the other sections have been identified and are shown in the Master document, beginning on Page 7. The objective is for each lead author(s) to provide information for the outline(s) of their section(s). Once the outlines have been submitted and approved by the Work Group, work can begin on drafting the actual sections of the document.
The primary objectives of this meeting are to:
· Review the high level outline for the document, beginning in Page 7 of the Master document and make changes, if necessary.
· Review the action party(ies) for each section and make changes, if necessary.
· Review the target dates for completing the outlines and make any changes, if necessary.
· Suggest items to be included in the outline for each section, if pertinent.
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.
Minutes: Dec. 1, 2009
· We reviewed the existing Master document and the information that it currently contains.
· We confirmed the existing general outline for the document, to contain sections on:
- High Pressure Land-Based Gas-Lift
- Deep Water Dry Tree (Platform Based) Gas-Lift
- Sub-Sea Gas-Lift
- Normal Pressure Sub-Sea Gas-Lift
Minutes: Feb. 5, 2010
· The Dry Tree and Sub-Sea gas-lift sections are for high pressure, as per our definition of high pressure.
· Mike Johnson and Alan Brodie will work together on outlines for high pressure and “normal” pressure sub-sea.
· Cleon Dunham will send minutes to the Work Group members.
· Cleon Dunham will place the current versions of the outlines in the “Master” document.
Minutes: May 11, 2010
· There was no discussion of this topic.
5. Action Items
Review and agree on action items for the members of the Work Group.
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.
Minutes: Dec. 1, 2009
· The action items listed above have been completed.
· New action items are:
- Each team is to complete the outline for their sections by Jan. 22, 2010.
- Wayne Mabry and Cleon Dunham will review and harmonize the outlines.
- Keith Fangmeier confirmed that all of his comments from above are in the Master Document.
- Wayne Mabry will approach API SC 19 and ISO Work Group 4 to request a new work item in ISO 17078-2, to handle testing of “barrier” gas-lift valves that limit leaking from the tubing to the annulus consistent with other integrity critical completion components.
- We want to have a drawing or drawings that depict a generic sub-sea system and all of the various documents and issues that impinge upon it. Tom Norland will sanitize and provide this.
- Cleon Dunham will annotate the drawing with appropriate API and ISO references.
- Wayne Mabry will ask Roland Goodman, our API representative, to find the API “picture” of a sub-sea system that shows all of the relative documents.
Minutes: Feb. 5, 2010
· Outlines of some of the sections have been submitted.
· The ones we have received have not been harmonized.
· The session groups should review their outlines and re-submit them.
· The session chairs are;
- Keith Fangmeier and Glenn Toney are working on Dry Tree,
- Mike Johnson on Normal Pressure Sub-Sea.
- Alan Brodie, Tom Norland Wayne Mabry, Britt Sliper, and Jorn Carlsen on Sub-Sea.
- Tom Nations, Bryan Freeman, Ian Schuur, and Stan Groff on Land.
· Next time we should schedule a longer meeting to review and agree on the outlines in detail.
· Tom Norland delivered his drawing to Cleon Dunham.
· John Martinez will review ISO documents for pressure ratings for flanges and valves.
Minutes: May 11, 2010
· Britt Sliper delivered a document from Jorn Carlson on the various ISO documents that are pertinent for sub-sea. It was discussed earlier in the meeting.
· Mike Johnson and Alan Brodie reviewed “Low Pressure” Sub-Sea and included this in the recommendations that were presented earlier in the meeting.
· We still need to develop an outline for the document to be written.
· Wayne Mabry and Cleon Dunham will prepare an outline for the document and review this with the Work Group before the next meeting.
· Wayne Mabry, Cleon Dunham, Michael Romer, Glenn Toney, and Britt Sliper will work on this on Tuesday afternoon.
· Cleon Dunham will send the reference on Chokes in Unloading Gas-Lift Valves.
· The information on API RP 19G13 is in www.alrdc.com, Technical Committees, API Gas-Lift, API RP 19G13. Access user name is api_gaslift, code is moreoil.
6. Any Other Business