Abstract
Characterizing reservoirs in cased hole formations has numerous advantages. Pulsed Neutron cased-hole wireline logging tools are slim, can be operated with relatively fast logging speeds, and are easily deployed in both stable and flowing boreholes with pre- and post-frac acquisitions. Such tools can be run in multiple logging modes with data from both time and energy spectra. The resulting data can easily be combined with that from other technologies in a variety of borehole environments, and in simple and complex completions, some of which are extremely challenging.
To determine the formation parameters in challenging environments, a workflow involving four major components is required. These include 1) data acquisition, 2) choice of the proper evaluation model, 3) consistency in the interpretation, and 4) validation of the results. Cased Hole Pulsed Neutron Logging (PNL) data provide formation parameters based on the selected logging mode and are useful to simulate and/or predict data that is lacking from other wireline technologies. In many cases they can complete the petrophysical interpretation while also supporting the understanding of offset wells. The choice of a prediction model depends upon the complexity of formation properties and the required resolution. The final evaluation of the integrated data set can be both qualitative and quantitative in nature. For complex and unconventional formations, the qualitative interpretation can provide a stronger link for the final determination of reservoir characteristics including a learning curve of how to quantify from qualitative analysis. What is perhaps most important is consistency in the interpretation of cased hole logging. This involves proper tool calibration, evaluation of the borehole environment, logging speed, choice of logging tools, and the selected modes of operation. These are all fundamental for understanding the final petrophysical analysis.
The basic PNL logging modes include Sigma, Carbon-Oxygen (C/O), and Gas Saturation Analysis. The standard application of these technologies is well known; however, for complex and unconventional formations, their application provides direction for exploiting the full potential of nuclear logging. In this presentation, workflow logic will be discussed along with field examples from complex and unconventional formations.
Speaker Biography
Natasa Mekic is a principal Geoscientist/Petrophysicist within the Global Research and Development group at Weatherford Wireline based in Houston, Texas. Her principle work and expertise is focused on the development of cased-hole pulsed neutron technology, interpretation algorithms, formation evaluation workflows, technology integration and the global support and training of the Geoscience team. Throughout her 17 years of industry experience, she has worked with Baker Hughes, Halliburton, and Weatherford and been based in both Denver and Houston. Her assignments have included multiple Geoscience roles ranging from Operations through R&D while primarily focused on integrated Petrophysical studies (Open and Cased Hole) for complex and unconventional formations. Natasa has authored and co-authored multiple published papers and industry related patents. She received her BS and MS in Geophysics/Geology from the University of Belgrade, Serbia.
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Regular luncheon reservation: 
Vegetarian luncheon reservation:
Use one of the PayPal links above to make your luncheon reservation. Note: see the From the Editor article below if you'd like to pay for the entire year!
If you are registering for someone else or using a PayPal account that is not in your name, please click here to send us an email with the correct registrant information. You should also use this link if you are registering multiple people; please provide the name and company affiliation for each registrant.
Forward this newsletter to a friend to invite them to the luncheon.
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When
Tuesday, September 17, 2019
11:20 am - 1:30 pm
Where
Wynkoop Brewing Company
(tell me how to get there)
Cost
$25 per person
$30 at the door (space permitting)
Next Month's Talk
Continuous Improvement of Well ROI
Don Herman
Cordax Evaluation Services
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From the President
Patricia Rodrigues
Welcome to the 2019-2020 Denver Well Logging Society new year. I hope summer treated you well and that you are ready for the new season!
First of all, I would like to thank the new members of the board, without everyone’s commitment we wouldn’t be able to make all this happen. This year we added a position of Director of Technology, as we recognize that the position of Vice President of Technology requires a greater commitment and we want to ensure that we all have similar responsibilities.
Last season was a very successful one for the society and we will work hard to provide members with another great season. This year besides our monthly luncheons, we will continue to provide a joint workshop with RMAG in the Fall, and our DWLS workshop in the Spring. The RMAG-DWLS workshop on Multiscale Imagining is approaching fast, it will be held October 22nd at the Sheraton Denver West and it comes with sponsorship and exhibitors opportunities please visit the event’s website for registration and sponsorship information.
This month we will start planning our DWLS Spring workshop, if you have topic ideas or suggestions we are eager to hear them, please contact our VP of Technology.
Please don’t hesitate to contact me with any questions, suggestions or ideas.
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From the VP - Technology
Jenny LaGesse
2019-2020 Luncheon Series
Welcome back from summer everyone, and welcome to the 2019-2020 luncheon series. As we greet September and our new luncheon speaker lineup, I’m interested to hear from you while I recruit new speakers to bring to our Denver petrophysical community. What topics, tools, basins, technologies or workflows do you want to learn more about this season? What do you want thrown to the rubbish pile? Please send me an email at VP_Technology@dwls.spwla.org with your comments, suggestions and critiques and let me know. I will strive to find interesting topics for you, and I welcome your feedback.
I recently searched and found the first (recorded) DWLS talk – from September 1985. It was presented by William Hendricks of NL Technology Systems on the topic of “Formation Evaluation Using Measurements Recorded While Drilling”. If we had our time traveling machine ready to take us back 34 years, what key insights about MWD interpretations would we want to impart to that 1985 audience? While I don’t expect any time travelers to speak this season, I think it’s valuable to think about each topic in a similar light: what key piece of information, or new technique is just around the corner in our future that will take us to the next level of petrophysical analysis and reservoir characterization? Every luncheon offers new opportunities to ask and to try and answer that question.
This September we begin with a talk from Natasa Mekic from Weatherford International. The title of her talk is “Interpretation of Cased Hole Pulsed Neutron Logs in Complex and Unconventional Formations”. We hope to see you there.
In October, we will host Don Herman from Cordax Evaluation Services with his talk, “Continuous Improvement of Well ROI”.
2019 RMAG DWLS Symposium
The 2019 RMAG & DWLS Fall Symposium will be held on October 22, from 8:00 am to 4:00 pm at the Sheraton Denver West in Lakewood, Colorado. This year’s symposium has 11 outstanding speakers on the topic: “Multiscale Imaging for Reservoir Optimization”. The technical program will be organized topically and will provide cross-disciplinary collaboration between the two societies.
The cost of the symposium is $225 for DWLS and RMAG members, $275 for non-members. Registration includes breakfast, lunch, and a reception to follow the talks.
For registration and list of speakers please visit the website.
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From the Editor
Dominic Holmes
Vegetarian lunches
You'll notice a new option in the reservation section above. The standard link to register for the luncheon as well as a new option to register for a vegetarian meal. We have always allowed people to order a vegetarian meal if desired, but the problem is that we also were paying for the regular luncheon for these folks. So we're going to try to do it this way to eliminate overpaying for additional lunches.
Pay for the Year
Do you find yourself attending the DWLS every month with regularity, but from time to time forget to actually make your reservation? We are bringing back the successful program from last year whereby you pay upfront now for all luncheons for the year, and we give you a break on the total cost. For the entire season of 8 luncheons, you pay only $175 and you won't need to register through the rest of the year. If you want to sign up for this but would like your luncheon to be vegetarian, please just email me to let me know.
If you join this program, you will be getting a separate email from me each month requesting you contact me if you find you cannot make the meeting that month, so we don't order an extra lunch for you.
Small Print
There is no refund should you not be able to attend any of the luncheons. Consider it a generous donation to your favorite local society.
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From the VP - Membership
Stefani Brackenoff
Welcome back to the 2019-2020 DWLS season! We are now accepting DWLS membership dues for the year ($10 for a yearly membership, and $75 for a Lifetime membership). Please visit the DWLS website to pay on-line.
If this is your first year and you would like to be a DWLS member, the first year is FREE!
If you do not know your current membership standing, are a lifetime member that wants to update your information with us, or have any membership questions please email me.
Currently to start the year off this is our membership as it stands:
Active Comp: Contacts in other societies; no dues due, just for information.
Renewal Due: Current year's dues due
Active New: Current year's dues paid, new member
Active Student: Current student
Active: Current year's dues paid
Active Lifetime: lifetime member
Inactive1: Previous year was ACTIVE, but not paid current year before Dec cutoff
Inactive2: Previous year was NEW ACTIVE, but not paid current year before Dec cutoff
Inactive3: Has not paid for at least 2 consecutive years
Inactive4: Was an Active student, and email address no longer active
Unsubscribed: Requested to be taken off of membership list
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From the Director of Beverage Sponsorship
Tyler Izykowski
Call To Action: Monthly Luncheon Beverage Sponsorships
Greetings DWLS community! It is my pleasure to take over for Jesse Havens as the Director of Social Events, Monthly Beverage Sponsorship, and Speaker Gifts. Wow, now that’s a tongue-twister! And what better way to untie one’s tongue than loosening up with a nice cold pint from Wynkoop’s vast selection of craft brews. (Now THAT’S a segue!)
DWLS is looking for beverage sponsors for the monthly luncheons for the 2019-2020 calendar. We are happy to announce that Cordax Evaluation Technologies, Inc. will be sponsoring the September meeting beverages (Thank you Cordax!) but are looking for sponsors for the remaining monthly meetings. The commitment typically amounts to $200-300, though this can vary based on the attendance and thirst of the crowd.
Upcoming Monthly Luncheons:
9/17/2019 – Cordax Evaluation Technologies, Inc.
10/15/2019 – Available for sponsorship
11/19/2019 – Available for sponsorship
1/21/2020 – Available for sponsorship
2/18/2020 – Available for sponsorship
3/17/2020 – Available for sponsorship
4/21/2020 – Available for sponsorship
5/19/2020 – Available for sponsorship
For more information or to sponsor an upcoming meeting, please contact Tyler Izykowski. Cheers!
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Calendar of Events
Click the calendar to the right to view events on the web.
Other Important Events
2020 SPWLA Annual Symposium, June 20-24, 2020 (Banff, Canada)
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DWLS Sponsors
Click here to view the sponsors on the website, or click on any image to contact a sponsor.
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Chapter Statistics
Statistic
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This Year
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3-Year Average
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| # of Active members * |
327 |
364 |
| # that are New members |
2 |
18 |
| # that are Students * |
0 |
9 |
| # that are Lifetime Members * |
263 |
283 |
| September luncheon meeting attendance |
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45 |
| October luncheon meeting attendance |
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44 |
| November luncheon meeting attendance |
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44 |
| Holiday party attendance |
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37 |
| January luncheon meeting attendance |
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72 |
| February luncheon meeting attendance |
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65 |
| March luncheon meeting attendance |
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51 |
| April luncheon meeting attendance |
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48 |
| May luncheon meeting attendance |
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60 |
* Note that we did a thorough cleanup of bad email addresses that resulted in some of our members being removed until they can be tracked down again. So this year's membership numbers are going to be a bit lower.
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The DWLS Newsletter is published monthly September through June by the Denver Well Logging Society. For information on membership or advertising, contact the editor. For other inquiries, contact a member of the Board of Directors.
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