How does an unstable GLV affect the producing zones?
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1 37 th Gas-Lift Workshop Houston, Texas, USA February 3 7, 2014 How does an unstable GLV affect the producing zones? Frode Hveding Vice President Reservoir 2014 Gas-Lift Workshop 1
2 Agenda Description of a new intervention service Z-System Fiber optics conveyed safely within a semi-stiff Carbon Rod Measuring principle Operation principle Applications Principle of GLV operation How can distributed measurements help? Tuning of production Unstable GLV any effect on production? 2014 Gas-Lift Workshop 2
3 Fiber optic High Resolution Sensing DTS Distributed Temperature Sensing DAS Distributed Acoustic Sensing Point sensors (calibrated) Pressure Temperature Vibration 4 x Single- and 2 x multimode optical fibres Feb. 4 8, Gas-Lift Workshop 3 ft Bull nose with Pressure, Temperature & Vibration placed at the end of 6 km long Carbon Rod
4 All the well All the time Real Time Feb. 4 8, Gas-Lift Workshop
5 Applications of fiber optic intervention Leak detection Flow allocation Overburden integrity Fracturing / Stimulation Restrictions Flow pattern diagnostic Flow behind casing Microseismic Gas Lift Optimization Vertical Seismic Profiling Real time flow and production understanding 2014 Gas-Lift Workshop 5
6 Gas lift valve principle 2014 Gas-Lift Workshop 7
7 What are we measuring Distributed Temperature Sensing Gas flow through narrow orifice Cooling Joule Thomson effect the rate of change of temperature with respect to pressure μ JT = T P H = V C p αt 1 μ JT = Joule-Thomson coefficient H = constant enthalpy V = Volume of Gas C p = Heat capacity α = Coefficient of thermal expansion 2014 Gas-Lift Workshop 8
8 Gas lift valve Well 1 Temperature Acoustic Filter: Hz 2014 Gas-Lift Workshop 9
9 Gas lift valve Well 1 Temperature Acoustic Filter: Hz 2014 Gas-Lift Workshop 10
10 Gas lift valve Well 2 Temperature Acoustic Filter: Hz 2014 Gas-Lift Workshop 12
11 Gas lift valve Well 2 Temperature Acoustic Filter: Hz 2014 Gas-Lift Workshop 13
12 Gas lift valve differences Well 1 Orifice size 0.28in Injection rate m 3 /d Well 2 Orifice size 0.25in Injection rate m 3 /d 2014 Gas-Lift Workshop 14
13 Gas rate vs amplitude & frequency SPE McKinley et.al (1973) 5 psi/in 300 psi/in 40 psi/in 2014 Gas-Lift Workshop 15
14 Slugging GLV Effect on Reservoir? Cyclic production 2014 Gas-Lift Workshop
15 Starting up gas injection - DTS Feb Gas-Lift Workshop 17
16 Starting up gas injection - DAS Feb Gas-Lift Workshop 18
17 Stabilized? Feb Gas-Lift Workshop 19
18 How does the GLV behave? Feb Gas-Lift Workshop 20
19 Unstable conditions from where? Feb Gas-Lift Workshop 21
20 Flow regime consideration Tune the GLV in order to: Determine optimal gas injection rate & orifice size for highest liquid rate Ensure we have the correct flow regime in addition to highest possible liquid rate Understand if the pressure drop is sufficient for the lift required Distributed measurements are important to fully understand the actual effect 2014 Gas-Lift Workshop 22
21 ALL the well, ALL the time in REAL TIME Tune injection rate until stable production Improve GLV strategy Implement this method for ESP Gas Lift valve 2014 Gas-Lift Workshop 23
22 Summary Distributed Acoustic Sensing (DAS) and Distributed Temperature Sensing (DTS) are important tools for real time tuning with its capability of seeing «All the well All the time» in real time Important to ensure a safe and easy method to deploy fiber optics as an intervention service Tuning of the parameters to observe improvements is now possible: Zonal contribution Flow regime determination Pressure drop and pressure regime analysis 2014 Gas-Lift Workshop 24
23 Thank you!
24 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-inafter 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, noninfringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose Gas-Lift Workshop 26
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