UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGINGdwls.spwla.org/2018-03-20 DWLS...

transcript

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

Audience Survey:

• Title

• Petrophysicist?

• Engineer?

• Geosteerer/Directional Driller?

• Geologist?

• Mudlogger

• Geophysicist?

• Account Manager?

• Investor?

Survey

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

AKW Analytics/Range Resources

Mudlogging

defines and

helps stay in

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

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

of 44© Donovan Brothers Incorporated

3/6/2018Unconventional Reservoir Assessment using Mudlogging

3/6/2018 Unconventional Reservoir Assessment using Mudlogging

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

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

3/6/2018Slide 22 of 44

Matthies/

Sonnenberg

Examples-HCF Normalization

DENVER-JULESBURG

WELD COUNTY, CO

3/6/2018Slide 23 of 44

Matthies/

Sonnenberg

3/6/2018Slide 24 of 44

Longman

3/6/2018Slide 25 of 44

Matthies/

Sonnenberg

Examples-HCF NormalizationPASSEY/XRD

0 TOC 8

3/6/2018Slide 26 of 44

MUDLOGGED in 1953

3/6/2018Slide 27 of 44

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

3/6/2018Slide 28 of 44

3/6/2018Slide 29 of 44

3/6/2018Slide 30 of 44

3/6/2018

3/6/2018Slide 32 of 44

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

Larson

SUMMARY AND DISCUSSION

3/6/2018Slide 42 of 44

3/6/2018Slide 44 of 44

SUMMARY AND DISCUSSIONTHANK YOU FOR YOUR INTEREST

CONTACT ME IF YOU HAVE ANY COMMENTS OR QUESTIONS

Bill Donovan

donovan@petroleum-eng.com

(720-351-7470)

THANK YOU

DENVER WELL LOGGING SOCIETY

THE END

UNCONVENTIONAL RESERVOIR ASSESSMENT USING MUDLOGGINGdwls.spwla.org/2018-03-20 DWLS...

Documents