13 proses eksplorasi

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EXPLORATIONEXPLORATION PROCESSES

Eksplorasi

Eksplorasi dalam migas adalah semua kegiatan dari permulaansampai akhir dalam usaha pencarian dan penambahan cadangan

i bmigas yang baru.

Urutan suatu operasi eksplorasi meliputi proses sebagai berikut: Perencanaan eksplorasi (exploration planning) Operasi survey lapangan Penilaian dan prognosis prospek Pemboran eksplorasi

P b d l i d h Pengembangan dan reevaluasi daerah.

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Exploration Review Regional Studies

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Exploration Processes


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Exploration Review Analog Modelling



Bachtiar, dkk., 2003

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Exploration Review Geophysical


Exploration Review Prospect Generation

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Exploration Review Drilling Proposal

OPERASI

PEMBORAN

Gambar 3.9. Operasi Pemboran Sumur Nilam H25-35 Vico

Indonesia;A. Well proposal

Sumur Nilam H25-35; B. Rig pemboran;

C. Rotary table; D. Bahan untuk

membuat lumpur pemboran; E. Shale

shaker untuk memisahkan cutting;

F. Peralatan pengamatan cutting

dan oil show.

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Drilling Operations

z to test the HC potential of the objectives in a safe and reliablemanner

z to acquire data in cost effective manner

Mud LoggingMud LoggingMWDMWDMWDMWDLWDLWD

Wireline LoggingWireline LoggingFormation TestingFormation Testing

CoresCoresSamplesSamples

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Exploration Review Classification

z Exploration (wild-cat) Drillingto testto acquire date

z Evaluation/Delineation Drillingto determine (delineate) the extent of a discovery

z Development/ Extraction Drillingto extract/ exploit of a previously discovered HCp p y

z Injection Drillingto inject fluids into subsurface (EOR, dump or HC storage)

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Rig System Circulation 1

1 Sl h 1. Slush pump2. Swivel3. Kelly4. Bit5. Annular space6. Mud stream down ward7. Shale shaker

(tempat limpahan keratan sumur)8. Suction tank

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Rig type

Rig type - Jackups

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Rig Type - Submersibles

Rig Type - Drillship

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Rig Type Platform (production)

Rig Type - Onshore

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Laser Drilling A Concept

RIGSITE CONTRACTOR

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WELLSITE GEOLOGIEST: JOB PURPOSES

REFERENCE DEPTH

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WELL PROFILES

Drilling Operation - Sequences

30 pile driven until refusal

drill with 17 , enlarge with26 bit

20 conductor casing 120-15026 bit

drill with 12 , enlarge with 17 bit

drill with 12 bit

meter

13 3/8 surface casing surfacelogging

9 5/8 intermediate casingintermediate logging

drill with either 8 3/8 or 8 5/8 bit 7liner final/TD logging

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Well Logging

Process of all recording well/ formation data during drilling and after drilling of the well

Categories:Drilling Operation Logs : mud logs

MWDLWD

After Drilling /Wireline Logs : electricalacousticradioactivel t tielectromagnetic

Open-hole loggingCased-hole loggingProduction Logging

Well logging - Purposes

To answer the followings:

z existence of the reservoirsz location (depth) of the reservoirsz thickness of the reservoirsz lithology of the reservoirsz properties of the reservoirs (porosity, homogenity)z vertical and lateral distribution of the reservoirsz type of contained fluid in the reservoirsz fluid saturation and properties (salinity, temperature, pressure)p p ( y, p , p )

Key for well decision

13 proses eksplorasi

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