UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGINGdwls.spwla.org/2018-03-20 DWLS...
Transcript of UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGINGdwls.spwla.org/2018-03-20 DWLS...
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018
UNCONVENTIONAL RESERVOIR
ASSESSMENT USING MUDLOGGING
Bill DonovanDonovan Brothers Incorporated/Automated Mudlogging Systems
March 20, 2018
DENVER WELL LOGGING SOCIETY
Denver, CO
Slide 1 of 44
Audience Survey:
• Title
• Petrophysicist?
• Engineer?
• Geosteerer/Directional Driller?
• Geologist?
• Mudlogger
• Geophysicist?
• Account Manager?
• Investor?
Survey
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Audience Survey:
• Duties
• Formation Evaluation?
• Mudlogging?
• Geosteering/Directional Drilling?
• Reserve Reporting?
• Data Mining/Regression/Neural Nets?
• Calculating volumetics?
• Completions/Recompletions?
• Sales?
• Investing?
Survey
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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?
Survey
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Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018
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 DISCUSSIONSlide 5 of 44
•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)
OVERVIEW-Purpose
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OVERVIEW-Purpose
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AKW Analytics/Range Resources
Mudlogging
defines and
helps stay in
zone
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.
MUDLOG MEASUREMENTS
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MUDLOG MEASUREMENTS
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 Debra Higley
MUDLOG PROS AND CONS
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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
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MUDLOG PROS AND CONS
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
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MUDLOG PROS AND CONS
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
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MUDLOG PROS AND CONS
© Donovan Brothers Incorporated
3/6/2018 Unconventional Reservoir Assessment using Mudlogging
Walt
Kelly
Slide 14 of 44
MUDLOG PROS AND CONS
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Unconventional Reservoir Assessment using Mudlogging Slide 15 of 44
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
MUDLOG PROS AND CONS
Ty Taylor’s
Clemson
MS Thesis
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Examples-Production Normalization
Ty Taylor’s
Clemson
MS Thesis
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Examples-Production Normalization
Ty Taylor’s
Clemson
MS Thesis
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Examples-Production Normalization
NORMALIZE MUDLOGS ON
MATAHANGO SH
Ty Taylor’s
Clemson
MS Thesis
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Examples-Production Normalization
Ty Taylor’s
Clemson
MS Thesis
)
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Examples-Production Normalization
Ty Taylor’s
Clemson
MS Thesis
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Examples-Production Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018Slide 22 of 44
Matthies/
Sonnenberg
Examples-HCF Normalization
DENVER-JULESBURG
BASIN
WELD COUNTY, CO
Examples-HCF Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
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Matthies/
Sonnenberg
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Longman
Examples-HCF Normalization
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Matthies/
Sonnenberg
Examples-HCF NormalizationPASSEY/XRD
0 TOC 8
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Examples-HCF Normalization
MUDLOGGED in 1953
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
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Owl Creek 48, Codell Interval, Induction, Density and Mud Logs
Examples-HCF Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
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Examples-HCF Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
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Examples-HCF Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
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Examples-HCF Normalization
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018
Examples-HCF Normalization
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Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018Slide 32 of 44
Examples-HCF Normalization
55 wells with Mudlog Gas Content (GC) (green)
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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)
ρb = bulk density (gm/cc)
GC = gas content (scf/ton)
GCHA3597.1Gb
××××ρρρρ××××××××××××====
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Examples-Gas Markers
(((( ))))bHA3597.1
GGCρρρρ××××××××××××
====
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 ρb are from logs
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Examples-Gas Markers
55 wells with Mudlog Gas Content (GC) (green)
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Examples-Gas Markers
Mudlog GC (green)Cumulative Production GC (blue)
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Examples-Gas Markers
Mudlog GC (green)Cum Prod GC (blue)EUR GC (red)
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Examples-Gas Markers
55 wells with Mudlog GC (green)Cumulative Production GC (blue)
Estimated Ultimate Recovery GC (red)Isotherm Estimated GC (purple)
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Examples-Gas Markers
School for
Gifted
MUDLOGGERS
After
Gary
Larson
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SUMMARY AND DISCUSSION
© Donovan Brothers Incorporated
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SUMMARY AND DISCUSSION
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3/6/2018Slide 42 of 44
SUMMARY AND DISCUSSION
55 wells with Mudlog Gas Content (GC) (green)
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SUMMARY AND DISCUSSION
Unconventional Reservoir Assessment using Mudlogging© Donovan Brothers Incorporated
3/6/2018Slide 44 of 44
SUMMARY AND DISCUSSIONTHANK YOU FOR YOUR INTEREST
CONTACT ME IF YOU HAVE ANY COMMENTS OR QUESTIONS
Bill Donovan
(720-351-7470)
THANK YOU
DENVER WELL LOGGING SOCIETY
THE END