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IPO Unloading Valve Technology Developments and The Associated Benefits Alan Brodie, Feb 2011.

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Presentation on theme: "IPO Unloading Valve Technology Developments and The Associated Benefits Alan Brodie, Feb 2011."— Presentation transcript:

1 IPO Unloading Valve Technology Developments and The Associated Benefits Alan Brodie, Feb 2011

2 IPO unloading valve technology developments Introduction IPO Unloading valve operation reminder What the industry wanted in tomorrows unloading valves What’s different about PTC unloading valves The benefits these differences are delivering

3 IPO Unloading valve operation reminder Required during gas lift well commissioning – Where lift gas pressure can’t facilitate deep lift During unloading they should have: – Predictable operating characteristics ( opening and closing pressures) – High as possible throughput After unloading they should: – Stay reliably closed for the life of the well – Not be a weak link in the primary well barrier envelope – Not allow shallow lift gas entry or multi-pointing Unless well conditions change or are unpredictable: – And lift gas via the operating valve becomes unachievable – Then the unloading valve should be capable of: Reliably acting as an operating valve

4 IPO Unloading valve operation reminder Ball and seat valve set in side pocket mandrel Also incorporates a check valve ( not shown here): – To provide tubing > casing integrity Held closed by an N2 charged dome Annulus (P1) and Tubing (P2) pressure trying to open it P1 acts on large bellows area P2 acts on the valve port: – When pressures are high enough valve opens – Injection pressure dominates....but tubing pressure still has an impact

5 The industry wish list for tomorrows unloading valves Improved Integrity: – Well barrier performance in line with packers and plugs Improved Reliability: – Life of well longevity – Fail safe architecture Reduced well commissioning costs Higher throughput for faster unloading Ability to pressure test tubing and annulus with live valves in the well Improved Performance: – High pressure rating to enable deeper installations – Reduced valve throttling and chattering – Flexibility to use as an operating valve if well conditions change Without compromising integrity or reliability

6 What’s different about PTC unloading valves Well Integrity Incorporates well barrier accredited check valve module: – Optimised flow paths and long valve travel – Minimal erosion – Patented orifice check dart linkage Chattering virtually eliminated:

7 What’s different about PTC unloading valves Well Integrity

8 Incorporates well barrier accredited check valve module: – Optimised flow paths and long valve travel – Minimal erosion – Patented orifice check dart linkage Chattering virtually eliminated: – Spring location (around dart) & size Robust and requires 25 psi dp to open Achieved V1( <20 cc /10 mins based on ISO 14310), even: – As part of an unloading valve – After flowing erosive fluid through the valve A well barrier is for life not just to pass a FAT

9 What’s different about PTC unloading valves Reliability In addition to well barrier accredited check valves The PTC IPO valves use a revolutionary bellows design All dome seals and inflation valves are metal / metal: – Reduces likelihood of dome pressure leakage: Bellows rated to psi – Usually operating well within range No dp across bellows – Tested up to cycles without failure: Very low load rate ( flexible even at psi ) – Long stem travel / large valve opening – Little throttling / erosion / chattering Valve held closed by spring – Not by bellows pressure as is more common – Active fail safe closure mechanism in the event of dome pressure leak bellows failure – No multi-pointing

10 What’s different about PTC unloading valves Reduced well commissioning costs Faster unloading rates – Long stem travel in both unloading and check valve modules: – Designed using computational fluid dynamics Faster completion pressure testing – Shearable unloading valves – Avoids the need to run dummy valves for tubing and annulus testing – Patented shear mechanism external to valve Works even with multiple valves in the well

11 What’s different about PTC unloading valves Improved performance Bellows area larger than in most unloading valves: – Low R factor......less tubing pressure sensitive More predictable performance Bellows load rate ( stiffness) lower than in most unloading valves: – Even at psi – Valve fully opens quickly with long stem travel Less throttling / chattering: – Ideal where conditions are uncertain or may change Unloader module becomes “practically invisible” Unloader can be used as a shallow operating valve – Without compromising well integrity or reliability 10 k psi pressure rating: – Valves can be used in deep or high pressure applications Deeper lift depth results in higher production

12 Conclusions A new generation of IPO valves are now available: – Their design is revolutionary and in many ways unique They are now delivering a step change in: – Well integrity Unique well barrier capability even after erosion testing – Reliability Unique high pressure low load rate bellows – Commissioning costs reduction Unique shearable unloaders – Performance Unique flexibility to use as an operating valve

13 Feb , Gas-Lift Workshop13 Copyright Rights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Gas-Lift Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the American Society of Mechanical Engineers (ASME), rights to: – Display the presentation at the Workshop. – Place it on the web site, with access to the site to be as directed by the Workshop Steering Committee. – Place it on a CD for distribution and/or sale as directed by the Workshop Steering Committee. Other uses of this presentation are prohibited without the expressed written permission of the company(ies) and/or author(s) who own it and the Workshop Steering Committee.

14 Feb , Gas-Lift Workshop14 Disclaimer The following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Gas-Lift Workshop Web Site. The Artificial Lift Research and Development Council and its officers and trustees, and the Gas-Lift Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Gas-Lift Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained. The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials. The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose.


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