Anomaly Marker Method for Gas-Lift Wells
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1 35 th Gas-Lift Workshop Houston, Texas, USA February 6 10, 2012 Anomaly Marker Method for Gas-Lift Wells Carrie-Anne Taylor, Echometer Company Lynn Rowlan, Echometer Company Feb. 6-10, Gas-Lift Workshop 1
2 Anomaly Marker Method Purpose Accurately calculate the distance to the liquid level plus other downhole reflectors such as gas lift valves, tubing collars, subsurface safety valves and possible holes or other problems. Distances Determined using echoes from gas-lift valves at known distances from the wellhead. Accounts for Variations of acoustic velocity commonly observed in most wellbores due to variations of temperature, pressure and gas composition as a function of depth. Feb. 6-10, Gas-Lift Workshop 2
3 Anomalies are Markers in the Well at Known Distances Anomaly distances are entered as Well Marker Info Initially based on an estimated acoustic velocity, tick marks along the depth axis are located at distances that would correspond to the location of the anomaly echoes. Anomalies don t match echoes, relocates each tick mark to match exactly the beginning of the echo for a specific anomaly. Anomaly echoes are fixed to known depths by starting from the first anomaly, then from the first anomaly to the second anomaly and so on until the distance to the liquid level is accurately determined. Feb. 6-10, Gas-Lift Workshop 3
4 Computed Distance to Liquid Level Distance to the liquid level is computed: Start at distance to deepest anomaly Last interval distance to liquid level equals Acoustic Velocity * Time/2 Add anomaly distance plus interval distance to liquid level LL = DA + ((RTTT from DA to LL*AV)/2) Feb. 6-10, Gas-Lift Workshop 4
5 Anomaly Example Noisy Initial Acoustic Trace With Anomaly Echoes Collars Anomaly Echo Feb. 6-10, Gas-Lift Workshop 4
6 See Echoes Better by Removing Noise From Acoustic Trace Scale up trace to see better.
7 Identify/Select Correct Liquid Level Echo Move the LL marker to the knee of the kick.
8 Liquid Level Depth is Approximate
9 Known Depth of Anomalies
10 Make Depth Accurate by Identifying Each Anomaly SSSV
11 Next Anomaly Automatically Selected At first glance, it appears the automatic pick of marker is a little to the left of the kick.
12 Fine Tune Location of Selected Anomaly But we also see a kick to the left of the marker. Some quick calculations tell us that this is not a repeat. Select Interval Left to get a clear picture of the reflection located just below the 6 second mark.
13 Examine the Acoustic Trace and Select Correct Echo This is a much more likely position for the placement of the next marker.
14 Continue Down Trace Selecting Anomaly Echoes If the correct marker is not selected, then move window to see the marker echo.
15 Continue Down Trace Selecting Anomaly Echoes
16 Continue Down Trace Selecting Anomaly Echoes Scale UP if needed to verify that this is the last marker before the liquid level.
17 Anomaly Echoes Below the Liquid Level are Negligible Gas Lift Mandrel 8 and the Packer are below the liquid level marker so these last two markers can be skipped.
18 Accurate Distance to Liquid Level Using Anomaly Depths
19 Old Reliable Paper Strip Chart S LL Must Analyze by Hand Calculating Depths and Acoustic Velocities
20 Sometimes, the liquid level is not immediately obvious. It is then necessary to identify the kicks down the shot trace. What to look for: Repeating echoes Repeating time intervals Whether kicks are going up or down Rate of reflection echoes on high liquid levels Wellbore Schematic Important!!! Feb. 6-10, Gas-Lift Workshop 20
21 Can Be Confusing Due To Lots of Echoes and Repeats Casing Liquid Level Feb. 6-10, Gas-Lift Workshop LL 21
22 Analysis Considerations 1) Sound reflection hits the liquid level, indicating a decrease in cross-sectional area which will show up as a downward kick on the shot trace. 2) Make sure the marker is placed at the knee of the kick the moment the kick begins its downward movement. 3) If markers have not yet been placed, the liquid level depth may reflect an unreasonable result. Place the marker at the appropriate kick, then place the anomaly markers. Feb. 6-10, Gas-Lift Workshop 22
23 Reflections after LL In almost every case, it is not possible to see below the liquid level. Any echoes showing up after a liquid level are repeat reflections. Always identify and eliminate echoes that are repeats. All anomalies can repeat. Example of repeats below liquid level. LL Feb. 6-10, Gas-Lift Workshop 23
24 Conclusion New Technology Does the Calculations on the Acoustic Trace for You Identifying Anomaly Echoes is Simplified Marker Depths are Automatically Determined Manual Adjustments Required For Accuracy Data is digital and not on a Strip of Paper, so Safe Backup of Information is Done Recall of Data and Re-analysis is a Straight Forward Process Feb. 6 10, Gas-Lift Workshop 24
25 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. Feb Gas-Lift Workshop 25
26 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. Feb. 6 10, Gas-Lift Workshop 26
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