origin spring gully

7/31/2019 Origin Spring Gully

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SPRING GULLY PROJECT


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SPRING GULLY DEVELOPMENT AREA

Gas Plant3x3500 HP compression36TJ/d capacity

Pipeline89km transmission pipeline147km gathering system

Wellhead42 wells

Evaporation Pond15-20,000 kl/d capacity


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Delivered under EPCM project management philosophywith key disciplines managed by Origin employees

Origin is Project Manager

Multiple Contracting Philosophy

Shedden Uhde Management System

Cost Control

Contracting/Procurement/Expediting

Engineering Design

Origin Staff Imbedded throughout Team under OriginProject Director

Operations Staff Employed from Start

Field Supervision engaged by Origin


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Spring Gully Project Schedule

June 2005July 2005First gas

May 2005April 2005Complete Gas Plant

March 2005Nov 2004Complete PipelineConstruction

Feb 2005Feb 2005Complete GatheringSystem

Oct 2004Jul 2004Complete DetailedEngineering

Actual DateForecast Date


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Environmental Approvals

Extensive baseline environmental

studies completed. Hydrology Flora/Fauna Soils Groundwater European Heritage

Noise Environmental Management Plan

approved by regulatory authorityand environmental licence issued.

Baseline studies identified twoecosystems and two fauna speciesprotected by CommonwealthLegislation (EPBC Act).

The development was referred forapproval under the EPBC Act andfound to be a not controlledaction.

Brigalow Scaly Foot

Squatter Pigeon


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Native Title & Cultural Heritage Approvals

Cultural Heritage Agreements have been reachedwith the relevant Native Title parties for the area.

Representatives of Traditional Owner groups areemployed to checkall proposed newdisturbances andmonitor earthworksactivities.

An Indigenous LandUse Agreement (ILUA)

was reached with theNative Title party for

PL204.


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How CSG is trapped

Unlike conventional natural gas reservoirs, where gas is trapped bybuoyancy underneath a sealing rock within the pores (holes) in thereservoir rock, gas in coals is adsorbed onto the surface of the coals(micropores and fractures) and held in place by the water pressure. This

means a structural trap is not necessary to retain CSG, howeverundersaturation with gas can occur if the water pressure is higher than inthe past, meaning more water must be produced to obtain the same gasvolume

SAND GRAIN

PORE SPACE

FACE CLEAT

BEDDING PLANE

BUTT CLEAT


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CSG Vs Conventional Production

Because the micropore surface area of coals is much larger than theporosity in conventional reservoirs, coals can retain much larger volumes

of gas over the same thickness and area. However the productioncharacteristics of a coal is more dominated by the fracture network(cleats and joints) and this means drilling is generally targeted towardareas with a higher chance of dense, open fractures

StableProductionDewatering Decline

Methane

Pro

duction

Time

Water

Methane

Production

Time

Water

CSG Production Profile Conventional ProductionProfile

Typical conventional sandstone field(6.5m thick, 1500m depth) in theSurat Basin contains 2.2 PJ/km2 ofrecoverable gas

Typical CSG field (20 mthick, 500m depth) in theSurat Basin contains 5.1PJ/km2 of recoverable gas


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WELLHEAD & SEPARATOR

WELLHEAD & SEPARATOR

TYPICAL WELL SPACING 1.0 - 1.5km2

COALDEPTH~700 -800m

UNDER REAMING

PUMP

PUMP

FLARESTACK

GAS FACILITY

EVAPORATION PONDS

GasL

ine

Barren Rock

Coal Seams

Overburden

Barren Rock

WATER PUMP

WELL CASING

CASING

Water

Line

SalesGasLine

WaterLi

ne

GasLi

ne


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Spring Gully Gathering Facilities

Water

Gathering

Flowlines

Permeate (Salt Water)to Evaporation Ponds

Fresh Water

to irrigation orcreek discharge

Gas and Water Gathering Flowlines

Possible re-injection of pond brine

to depleted coal seams

Reverse Osmosis F ield Trial

Sales Gas Compressor

Gas

Gathering

Flowlines

Evaporation Pond & Storage

Pigging Facility

Sales Gas Pipeline

Wellhead & Separator

Irrigation

Creek Discharge


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Wellhead

Drive Head

RemoteTelemetry

Unit

Water & Gas Metering System

Water & Gas Separator

Gas fired hydraulicdrive unit

UNDER-REAMHOLE

WATER

PUMP

CASING

CEMENT TOSURFACE

OVERBURDEN G

ASGAS

TA

RGET

S

EAM


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Cavitation Rig Layout

COAL COLLECTIONPITS

CATWALK ANDPIPE RACKS

BLOOIE LINE

CAVITATION RIG BOP STACK

RIGFLOOR

MUDTANKS


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Cavitation - Well Schematic

PLAN VIEW

SHEARFAILUREZONE

TENSILEFAILUREZONE

ORIGINALWELLBORE

CAVITY

ENHANCED PERMEABILITY ZONEEQUALS PRODUCTION INCREASE


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Fracture Stimulation Well Schematic

origin spring gully

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