FINAL Larry Hall

8/12/2019 FINAL Larry Hall

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2 2011 HAL LIBURTON. ALL RIGHTS RESERVED.

Full Diameter (Whole Core) Coring - drillstring-conveyed BHA to recover a continuous column offormation material Conventional Coring with standard core barrel BHA must trip the entire drillstring Thru-Drillstring Wireline Retrievable Coring can trip the inner components and

core via wireline

Sidewall Coring traditional wireline tools to cut discrete plug samples of formation material fromthe wellbore Rotary Percussion

4 OD Whole Core Samples 1 OD Sidewall Sample6 OD Core Barrel

CORING: Defined as the downhole acquisit ion and recovery tosurface of reservoir formation material mainly by two methods.


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CORING is a key component of Formation Evaluation (FE) andprovides formation material needed for: Hands-on laboratory testing and evaluation - core analysis Geological descriptions - lithological and petrographic

evaluations Geomechanical testing / geochemistry In other words

Defining and describing the reservoir Integrating, interpreting, and calibrating all types of well logs

Verifying hydrocarbon reserves in place

Why Coring?


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A leading global coring serviceprovider with over 40 years ofservice to the industryPerforming over 400 jobs / year,cutting 70,000+ feet ofwhole coreTypically core for ~170 customersin 48 countriesNo LTi for over 13 years

Achieving 94%+ core recoveryFull range of coring servicesRe-entered the NA coringmarket in 2011

Halliburton DBS Conventional Coring SystemsWho we are


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Halliburton Coring Systems

Conventional Coring Services and Technology for Shale ReservoirsHeavy Duty Threadform (HDT) high-torque core barrels 2, 3, 4 and 5 cores Extended reach barrels Aluminum inner barrels frequently vented

RockStrong Swivel System to mitigate the formations of jamsState-of-the-art PDC and impregnated core bitsOriented coringThru-tubing Wireline Coring with Latch-Les (2 core) and RockSwift (3 core) systemsSponge Coring (we were the original developers of this technology)

Wireline Coring Rotary Sidewall CoringHRSCT 60 cores 1.0 OD x 2.12 LHRSCT 30 cores 1.5 OD x 2.50 L (samples suitable for rock mechanics analysis)


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STABILIZERS

OUTER ASSEMBLY

ADJUSTABLE

SAFETY JOINT

TURNING

A HANDLE

SWIVEL

ASSEMBLY

BALL

SEAT

DISPOSABLE

INNER TUBE

SHOE

ASSEMBLY

HIGH

PERFORMANCECOREHEAD

CORECATCHER

Typical spring-type core c atcher

Steel outer barrel

Aluminum inner barrel

Drilling fluid

Core

Cross section of a core barrel Aluminum i nner barrels

PDC core bit

Standard Core BarrelHDT Core Barrel: 30-ft in length


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Jamming in the core barrel is a principal cause of low coringefficiency and premature trips-out-of-hole.Jamming occurs in the: Throat of the core bit Inner barrel

The various shales have their own behavior regarding jamming potential

Eagle Ford may be forgiving can run longer barrels Haynesville may not be stay with shorter barrels

Methods to mitigate jamming are: RockStrong Swivel System to absorb axial vibrations of the

inner barrel MaxBHA pre-job modeling to optimize the

coring BHA

Jam MitigationPreventing premature tripping-out-of-hole


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Conventional Wireline-Retrievable Coring SystemsWireline retrieval of the inner barrel

There are limitations and concerns regarding w ireline retrievable systems:

WL systems typically cut smaller diameter cores than conventional tools

WL systems that cut cores >2-in diameter require non-standard drill pipe Drift must be >4.125-in to allow pass-through of internal components.

The cost of drill pipe rental is high Mobilization of drill pipe adds days-on-hole to the coring program(rig cost issues)

Rapid WL retrieval can lead to gas expansion fracturing of the core This leads to falsely optimistic core analysis results e.g., higher porosity Slow retrieval negates an advantage of the tool

Conventional coring tools can cut longer cores in one run WL runs of 30 - 60-ft are typical Conventional runs of >180-ft are common


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So consider the objectives of the coring program:

Need core quality; concerned about the effect of the coring program on coreproperties?

Looking only for gas saturation and not too concerned about core quality?

Coring very long intervals in one well e.g., 3000-ft of coring?FYI we are currently cutting ~4000-ft of shale from one well inColombia with our RockSwift system

Then determine the proper coring process.

Conventional vs. Wireline Coring Systems


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Each 30-ft section must be carefullyprocessed no bending or flexing thatwould damage the core

Each section is strapped into a Lay

Down Cradle or Shuttle

Laying Down the Core-Filled Inner BarrelWellsite core processing to ensure core quality


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Cutting the Core-Filled Inner BarrelWellsite core processing

Each 30-ft section is cut into 3-ftsegments for shipment to the lab

Core Saws are used to cut the innerbarrel and core

The 3-ft segments are packaged in aCore Safe then shipped to the lab


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Halliburton Rotary Wireline SystemsCore plugs taken at discrete intervals

Wireline logging toolsRecover 30 - 60 core plugs in one WL run

Tools have a single electrically-driven core bit

Standard tool cut 1-in OD x 1.5-in long plugs

The new HRSCT tool is delivering 1.5-in ODx ~3-in long samples Depending upon length, delivers 2X to 3X

more pore volume than 1.0 tool

There is a strong demand for this sizecore plug in rock mechanics analyses


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When cor ing in shale gas reservoirs:Consider your coring objectives why are you taking the core?

Select the proper coring system

Remember that Halliburton provides the solutions to meet yourcoring objectives: Conventional coring Wireline coring Rotary Sidewall Coring

Closing Thoughts on Coring UnconventionalReservoirs (Shales Gas)


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Thank You. Questions?

FINAL Larry Hall

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