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CORING OPERATIONCORING OPERATION

CORING OPERATIONCORING OPERATION

WHY CORING ?WHY CORING ?

BRING TO SURFACE A COLUMNOF THE DRILLED FORMATION

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Kapan Harus coring?

CORING OPERATIONCORING OPERATION

EXPLORATIONWELLS

CORING

DELINEATION &DEVELOPMENT WELLS

CORING

Coring ketika pengeboran menenbus reservoir Dan ada sumber potensi minyak

Dari cuting yang ada di bak penampungan bahwapengeboran telah menembus reservoir

WHEN UNKNOWN or UNEXPECTEDGEOLOGICAL CONTEXT

FOR BASEMENT IDENTIFICATION (TD CORING)

FOR PRODUCTIVITY ANALYSIS

FOR GEOLOGICAL MODELLING,

Mata Mata BorBor MenghasilkanMenghasilkanLumpur Lumpur BorBor

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Mata Mata BorBor CORINGCORING

CORING OPERATIONCORING OPERATIONCoring: What For ?(aims)

GEOLOGICAL ENVIRONTMENT

Facies deposition Matrix: Rhoma Phi0 m n PLUGS (surface cond ):

RESERVOIR CHARACTERIZATIONSTATIC C parameter D DYNAMIC

Facies deposition Sedimentary sequences Fracturation network Dip (apparent, structural) Thin sections,

microfossils, mineralogy, petrography

Matrix: Rhoma, Phi0 m, n & a coeff.

Water Saturation Sw Shaliness distribution =>

barriers Correlations

PLUGS (surface cond.):- Phi, K (horiz. and vert.)

SCAL (downhole cond.):- Irreducible SwIrr- Relative permeabilities- Kro, Krw => wettability

SEDIMENTOLOGIST,LOG ANALYST RESERVOIR Eng.

SEDIMENTOLOGIST,PALEONTOLOGIST,

YES. almostARE THESE ENOUGH

PURPOSESand/or REASONS TO TAKE

GREAT CAREDURING & AFTER

CORING? in view of the GEOLOGICAL MODEL

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CoringTechniquesCORING OPERATIONCORING OPERATION

AXIAL CORING LATERAL CORING

CORE BARREL SIDEWALL

ADVANTAGES CONTINUOUS RECORD Possible ORIENTATED (Dip.

Azimuth) PETRPHYSICAL PROPERTIES

minimally disturbed Various INNER TUBES:

Alumunium, FibreglassRubber sleeve, Sponge,

WIRELINE ACQUISITION FAST & CHEAP RUN AT ANYTIME (preferably

at TD) SELECTED SAMPLES (AFTER

LOGGING) PERCUSSION or MECHANICAL

bullets Mineralogy Studies,gy ,

LIMITATIONS SLOW and EXPENSIVE possible POOR RECOVERY

along: FRACTURED zones UNCONSOLIDATED formations

DISCONTINUOUS RECORD MODERATE RECOVERY

(flushed zone) NO Phi-k ANALYZES

DRILLING Departments prefer not to core: but they want (BHI Coring Seminar)

CORING OPERATIONCORING OPERATIONCoring Equipment

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CORING OPERATIONCORING OPERATIONCoring Equipment

CORING OPERATIONCORING OPERATIONClose Future SELECTIVE CORING

Initially called Selective Coring After Logging: SCAL?BENEFIT & ADVANTAGESCombinable with LWD/MWDCoring while drilling (up to 27 ft)-sleeping module into BHACirculation through whipstockPuncher for unconsolodated form.Cost reduction (POOH,RIH)

then, Selective Coring Engineering B SCORE

Actual whipstock angle: 20

(future: up to 50? with packer?)

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CORING OPERATIONCORING OPERATIONCoring & Mudlogging Assistance

B UNDER WELLSITE GEOLOGIST RESPONSIBILITY

1. BEFORE Coring CHECK (or prepare) CORE TRAYS on rig floor and/or CORE BOXES:=>Quantity

(length cored + 10 %), Order (numbering & labeling) DATABASE: INCREASE SAMPLING RATE =>every 0.5m, instead of 1m CHECK SPP & FR : before dropping the ball: mud cirlulates through the inner tube after dropping the bal : mud circulates in annulus, between outer barrel-inner

tube

2. WHILE Coring ADJUST coring param (reduced compare to drilling phase) according to Core-

man, RECORD & MONITOR, as usual, all parameters (including lithological control), DETECT eventual troubleshootings : core jammed/ broken, connections, worn

bit,in order to stop coring, if necessary.

3. STOP Coring BREAK the core by pulling up (the core catcher retains the core in the inner

tube) when the core barrel is full or if no more penetration is observed, PULLING OUT the core assembly WITHOUT CIRCULATING at TD

CORING OPERATIONCORING OPERATIONCoring Operation: Recovery

UNSLEEVED CORE SLEEVED CORE

inner tubes => main use:CONVENTIONAL PRACTICE

LAY DOWN on

DRILL-FLOOR

LAY DOWN on

PIPE-RACK/ WALKAWAYHammer,

Plaseic Bags Electric saw + caps & clips to seal each section

Bottom

RUBBER SLEEVE: soft/ unconsol. FmFIBER GLASS: more and more usedALUMUNIUM: high Temp FmORIENTED CORING dip. fracture, direct. K, Sponge: Fluid recovery (?)

T1B1Catching

core

CORE-BARREL

BETTER OBSERVATIONS ON RIGSITE

BETTER PRESERVATIONS FOR TRANSPORTATION

B ALWAYS UNDER WELLSITE GEOLOGIST RESPONSIBILITY

TopTop

Bottom

Tn B1

TnBn

core Boxes

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SLEEVED CORESLEEVED CORE

CORE TRANSPORTATIONk d

CORE RECOVERY

inner tubes => main use:

METHOLOGHY

1. CLEAR a.s.a.p. pipe rack area, and move2. DEFINITIVE CORE BOXES to ML Unit3. COLLECT core chips every meter and place

chips inside plastic bags for examination

CORE MARKING4. DRAW/ underlined Orientation lines T=> B5. NOTCH up with saw each segment/ inner tube

=> for orientation inside inner tubes6. Clean with rags & mark depths on tubes7. % recovery = (Recov. Length/ interv. cored)

x 100

CORE PACKAGING

LAY DOWN on

PIPE-RACK/ WALKAWAY

Electric saw + caps & clips to seal each section

RUBBER SLEEVE: soft/ unconsol. FmFIBER GLASS: more and more usedALUMUNIUM: high Temp FmORIENTED CORING dip. fracture, direct. K, Sponge: Fluid recovery (?)

CORE PACKAGING8. SEAL with caps and clip each segments ends9. Subsidiary, Core Nb, Well Name, Box nb

note: Never write depths outside boxes

CHIPS EXAMINATION10. A/A and fill in Core D Description Sheet

BETTER PRESERVATIONS FOR TRANSPORTATION

Top Bottom

Tn B1

UNSLEEVED CORE

CORE TRANSPORTATION1. DEFINITIVE CORE BOXES to ML Unit2. Rough SHOWS Observation:

=> Oil staining & bleeding + UV light: Dir. Fluo.

METHOLOGHY

CONVENTIONAL PRACTICE

LAY DOWN on

DRILL-FLOOR

Hammer, Plaseic Bags

BottomT1

B1Catching core

CORE-BARREL

CORE MARKING3. Soft washing with RAGS, BRUSH, Humid Sponge4. Pieces MATCHING & ORIENTING from Top to Bottom

into DEFINITIVE CORE BOXES5. DRAW Orientation lines from Top to Bottom6. Meassuring core & mark depths7. % recovery = (Recov. Length/ Interv. Cored) x 100

CHIPS EXAMINATION8. Detailed SHOWS9. Litho, description, including sedimentary features,10. Labo analyses: calcim, Cut fluo, thin sections,

BETTER OBSERVATIONS ON RIGSITE

Top Tn Bn

core Boxes

10. Labo analyses: calcim, Cut fluo, thin sections,

CORE PACKAGING11. Subsidiary, Well Name, Core Nb, Box Nb, TBB=> note: Never write depths outside boxes

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CORING OPERATIONCORING OPERATIONCoring: Orienting & LabelingCoring: Orienting & Labeling

Top

2

3

4 Left: BLUEor BLACK

Orientationlines

Pieces matching

Right:RED

Starting Depth:1818.7m

Meassurefrom

Top Down3-4

Good fit

2-3Poor fit

(one line each side of break)

50 cm

Bottom

1

1-2No fit

(two lines each side of break)

1 m

Coring OperationCoring and Laboratory

SLABBED SECTIONSPLUGS

3 SCRATHES FORORIENTED CORING

PREFERABLY CUT AT THESAME DEPTH

CHIPS USED FOR

THIN SECTIONS

HORIZONTALVERTICAL

VPLUG

HPLUG

CORE

STRUCTURAL DIP and/ or HOLE DEVIATIONNOT TAKEN INTO ACCOUNT

SMALL CORES CUT INSIDEMAIN CORE

LONGITUDINAL CROSS SECTIONS

(for partners, ref.,,,,)

THIN SECTIONS

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AplikasiAplikasi daridari OperasiOperasi CoringCoring

PoperasiPoperasi Coring Coring SangatSangat mahalmahal DalamDalam pelaksanaannyapelaksanaannya harusharus

direncanakandirencanakan dengandengan matangmatang dandanditanganiditangani dengandengan hatihati--hatihati

HasilHasil yang yang didapatdidapat iniini akanakan mempengaruhimempengaruhikeputusankeputusan akhirakhirkeputusankeputusan akhirakhir

HarusHarus sangatsangat hatihati--hatihati bilabila bekerjabekerja dengandengancoringcoring

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