UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGING
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1 UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGING Bill Donovan Donovan Brothers Incorporated/Automated Mudlogging Systems March 20, 2018 DENVER WELL LOGGING SOCIETY Denver, CO Unconventional Reservoir Assessment using Mudlogging Slide 1of 44
2 Survey Audience Survey: Title Petrophysicist? Engineer? Geosteerer/Directional Driller? Geologist? Mudlogger Geophysicist? Account Manager? Investor? Unconventional Reservoir Assessment using Mudlogging Slide 2 of 44
3 Survey Audience Survey: Duties Formation Evaluation? Mudlogging? Geosteering/Directional Drilling? Reserve Reporting? Data Mining/Regression/Neural Nets? Calculating volumetics? Completions/Recompletions? Sales? Investing? Unconventional Reservoir Assessment using Mudlogging Slide 3 of 44
4 Survey Audience Survey: Wellsite Geology Mudlog Mudlogged? Geosteered? Supervise mudloggers/geosteerers? Purchase mudlogging/geosteering services? Use mudlogs in formation evaluation? Drilling rig Worked on a drilling rig? Visited rig during key operations? Unconventional Reservoir Assessment using Mudlogging Slide 4 of 44
5 OUTLINE PURPOSE MUDLOG MEASUREMENTS MUDLOG PROS and CONS MUDLOGGING INTERPRETATION AND EXAMPLES Marcellus, PA (normalizing for data mining) Niobrara, CO (TOC contribution/data mining) Wyodak Coals, WY (best practices) RESOURCES MEASURED DEFINTIONS THEORY MODEL SUMMARY AND DISCUSSION Unconventional Reservoir Assessment using Mudlogging Slide 5of 44
6 OVERVIEW-Purpose Understand rocks, fluids and flow mechanisms to exploit the oil and gas resources effectively and efficiently Decline Curve Analysis Versus Formation Evaluation Mudlog formation evaluation Predict well performance Corroborate other formation evaluation tools Determine if well performance fully exploits resources Exploration (analogs, ranking, scoring, analytics) When other logs are not available; drilling, HZ wells, Geosteering and supervise OH logging, Coring, DST Other (safety, organized record, second opinion) Unconventional Reservoir Assessment using Mudlogging Slide 6 of 44
7 OVERVIEW-Purpose Mudlogging defines and helps stay in zone AKW Analytics/Range Resources Unconventional Reservoir Assessment using Mudlogging Slide 7 of 44
8 MUDLOG MEASUREMENTS What does mudlogging measure, record and present? The basic mudlog records: 1) drilling rate 2) gas measured at the mudlogging unit 3) cutting properties; lithology and the presence of oil Mudlogging data is recorded over time The mudlog presents the above parameters and others as a function of depth, not time which requires a transform called lagging. Unconventional Reservoir Assessment using Mudlogging Slide 8 of 44
9 MUDLOG MEASUREMENTS Unconventional Reservoir Assessment using Mudlogging Slide 9 of 44
10 MUDLOGGING IS EFFECTIVE BECAUSE: 1-Mudlogging is independent of theories and models 2-Gas is a vapor measured at the surface under STP 3-Gas is insoluble in water and drilling mud 4-Gas expands as it travels to the surface MUDLOG PROS AND CONS Debra Higley Unconventional Reservoir Assessment using Mudlogging Slide 10 of 44
11 MUDLOGGING IS EFFECTIVE BECAUSE: 1-Mudlogging is independent of theories and models 2-Gas is a vapor measured at the surface under STP 3-Gas is insoluble in water and drilling mud 4-Gas expands as it travels to the surface MUDLOG PROS AND CONS Unconventional Reservoir Assessment using Mudlogging Slide 11 of 44
12 MUDLOGGING IS EFFECTIVE BECAUSE: 1-Mudlogging is independent of theories and models 2-Gas is a vapor measured at the surface under STP 3-Gas is insoluble in water and drilling mud 4-Gas expands as it travels to the surface MUDLOG PROS AND CONS Unconventional Reservoir Assessment using Mudlogging Slide 12 of 44
13 MUDLOGGING IS EFFECTIVE BECAUSE: 1-Mudlogging is independent of theories and models 2-Gas is a vapor measured at the surface at STP 3-Gas is insoluble in water and drilling mud 4-Gas expands as it travels to the surface MUDLOG PROS AND CONS Unconventional Reservoir Assessment using Mudlogging Slide 13of 44
14 MUDLOG PROS AND CONS Walt Kelly Unconventional Reservoir Assessment using Mudlogging Slide 14of 44
15 MUDLOG PROS AND CONS MUDLOGGING IS INEFFECTIVE BECAUSE: Whole measurement system is not calibrated (rubber ruler) Measurements cannot be repeated No standard methods, sensors, calibration or presentation Flushing in front of bit Surface measurement system not well understood Open drilling/bell nipple allow gas to escape Gas trap not unstable and linear Ambient temperature varies Not well understood by industry Unconventional Reservoir Assessment using Mudlogging Slide 15 of 44
16 Examples-Production Normalization Ty Taylor s Clemson MS Thesis Unconventional Reservoir Assessment using Mudlogging Slide 16 of 44
17 Examples-Production Normalization Ty Taylor s Clemson MS Thesis Unconventional Reservoir Assessment using Mudlogging Slide 17 of 44
18 Examples-Production Normalization Ty Taylor s Clemson MS Thesis Unconventional Reservoir Assessment using Mudlogging Slide 18 of 44
19 Examples-Production Normalization Ty Taylor s Clemson MS Thesis NORMALIZE MUDLOGS ON MATAHANGO SH Unconventional Reservoir Assessment using Mudlogging Slide 19 of 44
20 Examples-Production Normalization ) Ty Taylor s Clemson MS Thesis Unconventional Reservoir Assessment using Mudlogging Slide 20 of 44
21 Examples-Production Normalization Ty Taylor s Clemson MS Thesis Unconventional Reservoir Assessment using Mudlogging Slide 21 of 44
22 Examples-HCF Normalization DENVER-JULESBURG BASIN WELD COUNTY, CO Matthies/ Sonnenberg Unconventional Reservoir Assessment using Mudlogging Slide 22of 44
23 Examples-HCF Normalization Matthies/ Sonnenberg Unconventional Reservoir Assessment using Mudlogging Slide 23of 44
24 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Longman Slide 24of 44
25 Matthies/ Sonnenberg Examples-HCF Normalization PASSEY/XRD 0 TOC 8 Unconventional Reservoir Assessment using Mudlogging Slide 25of 44
26 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging MUDLOGGED in 1953 Slide 26of 44
27 Examples-HCF Normalization Owl Creek 48, Codell Interval, Induction, Density and Mud Logs Unconventional Reservoir Assessment using Mudlogging Slide 27of 44
28 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Slide 28of 44
29 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Slide 29of 44
30 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Slide 30of 44
31 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Slide 31of 44
32 Examples-HCF Normalization Unconventional Reservoir Assessment using Mudlogging Slide 32of 44
33 Examples-Gas Markers 55 wells with Mudlog Gas Content (GC) (green) Unconventional Reservoir Assessment using Mudlogging Slide 33 of 44
34 Examples-Gas Markers Common form of volumetric gas in place for shale and coal G = gas in place (MCF) A = drainage area (acres) H = thickness (feet) ρ b = bulk density (gm/cc) GC = gas content (scf/ton) G = A H ρ GC b Unconventional Reservoir Assessment using Mudlogging Slide 34 of 44
35 Examples-Gas Markers Back calculated gas content is based on cumulative production and/or estimated ultimate recovery (EUR) G is cumulative production or EUR A is the spacing unit H and ρ b are from logs GC = G ( A H ρ ) b Unconventional Reservoir Assessment using Mudlogging Slide 35 of 44
36 Examples-Gas Markers 55 wells with Mudlog Gas Content (GC) (green) Unconventional Reservoir Assessment using Mudlogging Slide 36 of 44
37 Examples-Gas Markers Mudlog GC (green) Cumulative Production GC (blue) Unconventional Reservoir Assessment using Mudlogging Slide 37 of 44
38 Examples-Gas Markers Mudlog GC (green) Cum Prod GC (blue) EUR GC (red) Unconventional Reservoir Assessment using Mudlogging Slide 38 of 44
39 Examples-Gas Markers 55 wells with Mudlog GC (green) Cumulative Production GC (blue) Estimated Ultimate Recovery GC (red) Isotherm Estimated GC (purple) Unconventional Reservoir Assessment using Mudlogging Slide 39 of 44
40 SUMMARY AND DISCUSSION After Gary Larson School for Gifted MUDLOGGERS Unconventional Reservoir Assessment using Mudlogging Slide 40 of 44
41 SUMMARY AND DISCUSSION Unconventional Reservoir Assessment using Mudlogging Slide 41 of 44
42 SUMMARY AND DISCUSSION Unconventional Reservoir Assessment using Mudlogging Slide 42of 44
43 SUMMARY AND DISCUSSION 55 wells with Mudlog Gas Content (GC) (green) Unconventional Reservoir Assessment using Mudlogging Slide 43 of 44
44 SUMMARY AND DISCUSSION THANK YOU FOR YOUR INTEREST CONTACT ME IF YOU HAVE ANY COMMENTS OR QUESTIONS Bill Donovan ( ) THANK YOU DENVER WELL LOGGING SOCIETY THE END Unconventional Reservoir Assessment using Mudlogging Slide 44of 44
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