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In Queensland, Australia, Coal Seam Gas (CSG) is taking off in a big way. This presentation - on design of wellsite facilities - is from a Society of Petroleum Engineers technical workshop held in that state, 30 March-2April, 2009 (details of workshop at http://www.spe.org/events/09aque/)
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Coal Seam Gas Wellhead Facilities
Some observations & ideas from Australian practice
SPE APPLIED TECHNOLOGY WORKSHOP (ATW)
PRODUCTION MANAGEMENT BEST PRACTICES FOR CBM FIELDS
30 March-2 April 2009 • Queensland, Australia
Geoffrey A . McKee +61 407 456 202 SPE Member 3190919
Overview. . . .
2 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
What do we mean by “wellhead facilities”?
Design. Where do we start?
Benchmarks. What do other operators do?
Example. One design approach for one project.
Some untested new concepts.
CSG Wellhead Facilities
Definition. What are wellhead facilities?
3 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
Produced water
Produced gas
� Mechanical drive for downhole pumps
� Fuel gas filter and drier
� Gas and water lines and fittings
� Gas flow meter (orifice or proprietary)
� Safety relief valves on gas & water lines
� Control panel including flow computer
Gathering systemWellhead Wellhead facilities
Produced water
Produced gas
Above ground Below ground
HDPE
HDPE 150#
150#
API 3000#
API 3000#
� Gas (throttling) control valve?
� Remotely operated gas shutdown valve?
� Separator for de-gassing water?
� Separator for de-watering gas?
� Separator for co-mingled water and gas?
Possible extra items (if justified):-
Basic system:-
CSG Wellhead Facilities
Real schematic #1 – basic system
4 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Real schematic #1. . . . . with separator added for “frothy” water
5 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Produced water downhole
pumps (~300 kPag)
Gas from annulus
(140 kPag)
With high water pumping rates:
� gas drawn into downhole pumps
� problems with gas separating at
high points in water gathering system
Real schematic #2 - characterised by gas pressure control valve
6 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Real schematic #3 – comingled gas + water
7 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Design. Where do we start?
8 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
1
• Design Basis Memorandum
(DBM)
2• Process Flow Diagram (PFD)
3
• Piping & Instrumentation
Diagram (P&ID)
Order equipment only after step 3 is complete!
CSG Wellhead Facilities
Concept schematic – manual gas throttling
9 Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Concept schematic – remote control
1
0
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Concept schematic – frothy water separator added
1
1
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Concept schematic – comingled water + gas through separator
1
2
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
Concept schematic – comingled water + gas through separator
1
3
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
New concept . . . . .
Install nodal separation stations to eliminate wellhead separators
1
4
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Gathering Systems
VERTICAL SEPARATON TANK (MADE FROM LARGE DIAMETER HDPE GAS PIPE)
TO REDUCE HDPE PIPELAYING COST, WITH FAVOURABLE SLOPING GRADIENT CAN
HAVE SINGLE 2-PHASE GAS+WATER LINE FROM SELECTED WELLS
New concept . . . .
Use of PCPump power for boosting gas pressure of weak wells
1
5
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Wellhead Facilities
HIGH PRESSURE WATER
(FROM DOWNHOLE PC PUMP
WELLHEAD
EJECTOR
VERY LOW POSITIVE PRESSURE
(OR VACUUM)
IN CASING
2-PHASE HDPE WATER+GAS LINE
TO NODAL SEPARATION STATION
(NEEDS TO HAVE SLIGHT
DOWNWARD SLOPING
GRADIENT)
New concept . . . . .
Eliminate inlet & oily water handling at central compression plant
1
6
Production Management Best Practices for CBM Fields, SPE Applied Technology Workshop, Queensland, 30 March - 2 April, 2009
CSG Gathering Systems & Central Gas Processing Facilities
NODAL (INFIELD)
COMPRESSION STATION
HEAT
EXCHANGER
SKID
DX CHILLER
PACKAGE*
“DRY” PIPELINE TO
CENTRAL PLANT
* IF ELECTRICAL POWER NOT READILY AVAILABLE, USE NH3 ABSORPTION CHILLER POWERED BY COMPRESSOR ENGINE WASTE HEAT
Coal Seam Gas Wellhead Facilities
Some observations & ideas from Australian practice
Thank you for listening!
Any questions?
Geoffrey A . McKee +61 407 456 202 SPE Member 3190919