Cryogenic Gas Plants
Efficient ethane and propane recovery from produced gas
APPLICATIONS
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Natural gas liquids (NGL) recovery
and hydrocarbon dew pointing
ADVANTAGES
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Recovery rates of more than 97%
for ethane and 99.9% for propane
Greater tolerance to carbon dioxide (CO2)
in the feed gas
For NGL extraction, improved ethane and propane recovery is essential. Efficiently separating them
from natural gas requires a cryogenic process. Our preengineered cryogenic gas plants are capable
of recovering ethane from natural gas streams at rates that can exceed 97%. Compared with
conventional systems, this represents a 10% improvement in production revenue.
Standard cryogenic plant offerings
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75-MMcf/d plant: 60–90 MMcf/d
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200-MMcf/d plant: 160–225 MMcf/d
Easy modulation between ethane recovery
and ethane rejection modes of operation
Typical Inlet Gas Conditions
Modular approach enables faster assembly
on site, accelerating time to market
for operators
Nitrogen
Methane
Carbon dioxide
Ethane
Propane
Isobutane
n-butane
Isopentane
n-pentane
Full scope of supply
Global network of life-of-field services
with 24/7 availability
Single-source OEM supplier
n-hexane plus
Hydrocarbon dew point,
galUS per 1,000-m3 C2+
Rich Mol %
1.24
73.77
0.04
14.29
7.55
0.73
1.84
0.23
0.21
0.10
100.00
6.90
Moderate Mol %
0.73
80.56
0.67
9.36
4.92
0.70
1.23
0.53
0.47
0.85
100.00
5.18
200-MMscf/d standard unit with simple and faster assembly on site.
Lean Mol %
0.35
85.94
0.62
8.61
2.35
0.37
0.72
0.22
0.28
0.55
100.00
3.71
Cryogenic Gas Plants
Key benefits
Standards
Speed to market
■■ Preengineered packages enables quicker installation
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Pressure vessels: ASME BPVC, Section VIII, Div 1 or 2
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Heat exchangers: TEMA C
Manufacturing capabilities for process equipment
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Electrical: API RP 500, NEC
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Piping: ASME B31.3
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Insulation: ASTM (onshore standards)
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Increased project economics
■■ Higher NGL recovery
Lower horsepower requirements
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Structural steel: AISC, ASCE 7-95
Flexibility to operate in ethane rejection mode
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Foundations: ACI 318
Complete life-of-field services
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Painting: ASTM/NACE (onshore standards)
Faster installation by modular design
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Galvanizing: ASTM A-123
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Inlet pressure condition range: 800 to 1,050 psi
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Engineering expertise
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Recovery of up to 97% C2 and 99.9% C3 when operating in ethane
recovery mode
Target recovery of 10% C2 and greater than 95% C3 when operating
in ethane rejection mode
Reflux exchanger
Residue
aftercooler
Subcooler
Booster
compressor
Residue gas
Residue
compressor
Expander
Reflux
separator
Inlet
separator
Demethanizer
Inlet gas
Cold
separator
Reboilers
NGL
Cryogenic flow diagram.
slb.com/gas-treatment
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