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CBM wellsite facilities - SPE workshop 2009

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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
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Page 1: CBM wellsite facilities - SPE workshop 2009

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

Page 2: CBM wellsite facilities - SPE workshop 2009

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

Page 3: CBM wellsite facilities - SPE workshop 2009

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

Page 4: CBM wellsite facilities - SPE workshop 2009

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

Page 5: CBM wellsite facilities - SPE workshop 2009

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

Page 6: CBM wellsite facilities - SPE workshop 2009

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

Page 7: CBM wellsite facilities - SPE workshop 2009

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

Page 8: CBM wellsite facilities - SPE workshop 2009

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

Page 9: CBM wellsite facilities - SPE workshop 2009

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

Page 10: CBM wellsite facilities - SPE workshop 2009

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

Page 11: CBM wellsite facilities - SPE workshop 2009

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

Page 12: CBM wellsite facilities - SPE workshop 2009

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

Page 13: CBM wellsite facilities - SPE workshop 2009

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

Page 14: CBM wellsite facilities - SPE workshop 2009

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

Page 15: CBM wellsite facilities - SPE workshop 2009

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)

Page 16: CBM wellsite facilities - SPE workshop 2009

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

Page 17: CBM wellsite facilities - SPE workshop 2009

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


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