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

© Donovan Brothers Incorporated

3/6/2018Unconventional Reservoir Assessment using Mudlogging Slide 2 of 44

Audience Survey:

• Duties

• Formation Evaluation?

• Mudlogging?

• Geosteering/Directional Drilling?

• Reserve Reporting?

• Data Mining/Regression/Neural Nets?

• Calculating volumetics?

• Completions/Recompletions?

• Sales?

• Investing?

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?

Survey




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



OVERVIEW-Purpose



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





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







4-Gas expands as it travels to the surface






2-Gas is a vapor measured at the surface at STP



Slide 13 of 44© Donovan Brothers Incorporated

3/6/2018Unconventional Reservoir Assessment using Mudlogging



3/6/2018 Unconventional Reservoir Assessment using Mudlogging

Walt

Kelly

Slide 14 of 44


© Donovan Brothers Incorporated 3/6/2018

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


Ty Taylor’s

Clemson

MS Thesis



Examples-Production Normalization

Ty Taylor’s

Clemson

MS Thesis




NORMALIZE MUDLOGS ON

MATAHANGO SH

Ty Taylor’s

Clemson

MS Thesis




Ty Taylor’s

Clemson

MS Thesis

)




Ty Taylor’s

Clemson

MS Thesis





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Matthies/

Sonnenberg

Examples-HCF Normalization

DENVER-JULESBURG

BASIN

WELD COUNTY, CO



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Matthies/

Sonnenberg


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Longman



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Matthies/

Sonnenberg

Examples-HCF NormalizationPASSEY/XRD

0 TOC 8


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MUDLOGGED in 1953


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Owl Creek 48, Codell Interval, Induction, Density and Mud Logs



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55 wells with Mudlog Gas Content (GC) (green)



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××××××××××××====




(((( ))))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




Mudlog GC (green)Cumulative Production GC (blue)




Mudlog GC (green)Cum Prod GC (blue)EUR GC (red)




55 wells with Mudlog GC (green)Cumulative Production GC (blue)

Estimated Ultimate Recovery GC (red)Isotherm Estimated GC (purple)




School for

Gifted

MUDLOGGERS

After

Gary

Larson



SUMMARY AND DISCUSSION


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SUMMARY AND DISCUSSIONTHANK YOU FOR YOUR INTEREST

CONTACT ME IF YOU HAVE ANY COMMENTS OR QUESTIONS

Bill Donovan

[email protected]

(720-351-7470)

THANK YOU

DENVER WELL LOGGING SOCIETY

THE END

unconventional reservoir assessment using mudloggingdwls.spwla.org/2018-03-20 dwls...

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