Abstract
Production flow profiles in a large population of U.S. unconventional lateral wells continue to exhibit what can be considered as inefficient behavior. Flow rates of gas or liquids can vary drastically from stage to stage and even from cluster to cluster in drain holes which are thought to be drilled and completed in essentially homogeneous pay from heel to toe. State-of-the-art production surveys using both fiber optic and wireline technology have illustrated this since the early days of horizontal completions in mud rocks. This is a recognized phenomenon, and the underlying engineering and geoscience causes are thought to be many and varied, and difficult to pinpoint. Adding to the uncertainty, production laterals, while penetrating continuously longer and longer intervals of the target reservoir, seldom have more extensive petrophysical data acquisition than directional GR measurements for well placement operations. Thus, it is a reasonable conjecture that the assumption of target formation homogeneity is less applicable, as there is no clear assessment of reservoir properties in the region near the borehole along the trajectory for the vast majority of unconventional wells.
We have implemented a recently published mechanistic model that describes wideband EM phenomena in earth formations. For practical application, we input petrophysical analysis results from field logs in pilot holes, and in rare cases, in laterals where some advanced logging has been done, to this model and simulate logs of dielectric permittivity and conductivity at wireline laterolog, induction, and dielectric tool frequencies, and at LWD tool frequencies.
We are also in a field-testing phase of a vendor-neutral process to directly invert the measured attenuation and phase shift data from LWD tool acquisition to obtain formation conductivity and permittivity. The inversion must be separately performed at each operating frequency to account for dispersion. The algorithm was developed anew from previously published work by rederiving the solution from Maxwell’s equations in a more computationally efficient manner. The inversion provides independent conductivity/resistivity log curves and permittivity log curves at the various LWD tool frequencies used.
This study presents the utilization of this new forward simulation and the new LWD inversion algorithm. These two complementary algorithms relate the measured conductivity and permittivity, and attendant dispersion, to water-filled porosity, salinity, and other key reservoir properties such as CEC, formation factor, and permeability. The results are self-consistent: the forward simulation followed by the inversion reliably reproduces the original input results and vice versa. The LWD in version can be performed on legacy data that has been acquired in pilot holes, high-angle, and lateral production wellbores to gain new insight into the nature of the reservoir in production. And it can be part of any planned LWD resistivity acquisition in new unconventional wells.
Speaker Biography
Scott Jacobsen is currently Vice President of Interpretation Development with NoHiddenPay, LLC, in Houston. His primary focus is on resistivity and EM technology log modeling and interpretation, and subsequent application to well productivity. Prior to this, he spent 10 years as a Technical Expert – Petrophysics at Southwestern Energy, working with both exploration and then asset development teams in most U.S. unconventional plays, from Niobrara to Marcellus. He began his career with Schlumberger as a field engineer in 1975 and held many application development positions in the US, North Sea, and the Middle East. He retired from Schlumberger as a Petrophysics Advisor and the Petrophysics Domain Champion for the US Land Unit. Scott is a member of SPWLA and SPE. He has a BS in Electronics Technology from Northern Ill. U. and a BS in Electrical Engineering from the U. of Notre Dame.
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Regular luncheon reservation: 
Vegetarian luncheon reservation:
Use one of the PayPal links above to make your luncheon reservation.
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, April 19, 2022
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
Advanced Surface Logging Techniques Provide Cost-Optimized Solutions for Reservoir Characterization
Isaac Easow
Geolog Americas Inc.
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From the President
Yulia Faulkner
What an unprecedented time we live in, the war that started over a month ago shook us all, not in a million years I would think this would happen, our thoughts go to Ukrainian families, refugees, soldiers, mothers, friends – we stand with you!
Uncertainties are a new normal! We don’t know what this war will mean for Oil and Gas in the US, it seems that we can produce more to support the demand, but have we recovered as an industry from the COVID drawback, negative Oil prices, and having to reduce stuff significantly? I try to keep in touch with many colleagues within the Oil and Gas industry and we all seem to wear different hats lately, due to a lack of help and support, the companies have not recovered, there is a waitlist to get a drilling rig, to get the tools, to complete the well. And yet capital expenditure is 3 times lower than what we had back in 2012, at the same Oil price as we have now. What will happen to Oil and Gas prices with the new Covid variant that started to spread in the US?
DWLS is extremely happy to host a 2 day Spring Workshop, April 13-14th, details are on the DWLS website. Thank you DWLS board for making this happen, thank you for volunteering time, and for great teamwork!
Last call for DWLS 2022/2023 volunteers. Electronic voting will take place before the April luncheon. Please reach out if you would like to be part of the DWLS board.
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From the VP - Technology
Jenny LaGesse
Thank you to our March speaker, Robert Lieber of Corsair Petrophysics, for sharing his insights on the Lyons Sandstone with us at the Wynkoop last month. We’re rounding the corner on the last luncheons before our summer break with two engaging speakers left.
Our final presenters of the year:
- April 19, 2022: Scott Jacobson, NoHiddenPay LLC, “Dielectric-Spectroscopy Observations while Drilling in U.S. Unconventional Reservoirs”
- May 17, 2022: Isaac Easow, Geolog Americas Inc., “Advanced Surface Logging Techniques Provide Cost-Optimized Solutions for Reservoir Characterization”
Please register online and we look forward to seeing you there.
The DWLS 2022 Spring Workshop on Cased Hole Formation Evaluation (CHFE) is just over a week away! The last day to register is April 6th.
This year we are honored to present Jim Hemingway (NoHiddenPay, LLC), who is both a former SPWLA President (2020–2021), and a former SPE Distinguished Speaker. Jim will lead the short course, which will cover older CHFE methods as well as newer technologies, focusing specifically on formation evaluation applications.
It will be a 2-day half-day workshop held April 13–14, 2022 at the Tabor Center in downtown Denver, from 7:30 am-12 pm each day.
The cost will be $125 for members, $175 for non-members, and $50 for students, and will include a PDF of course materials, and breakfast. A detailed course description and links to register have been emailed to members and are available on the DWLS website.
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Calendar of Events
Click the calendar to the right to view events on the web.
Other Important Events
2022 SPWLA Annual Symposium, June 13-15, 2022 (Stavanger, Norway)
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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 * |
277 |
314 |
| # that are New members |
1 |
15 |
| # that are Students * |
8 |
7 |
| # that are Lifetime Members * |
256 |
261 |
| September luncheon meeting attendance |
25 |
46 |
| October luncheon meeting attendance |
17 |
37 |
| November luncheon meeting attendance |
34 |
28 |
| Holiday party attendance |
n/a |
38 |
| January luncheon meeting attendance |
28 |
43 |
| February luncheon meeting attendance |
24 |
54 |
| March luncheon meeting attendance |
31 |
38** |
| April luncheon meeting attendance |
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43** |
| May luncheon meeting attendance |
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48 |
* 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.
** These numbers are skewed due to COVID-19 luncheon cancellations.
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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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