2015 ARKH-P3-Production Facilities
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SEPARATOR (skid mounted)
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GAS TREATMENT
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GAS PROCESSING
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COMPOUNDS |
PROBLEMS |
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WATER |
Hydrates (with free water) |
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Gas Water Dew Point |
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ACID GASES |
Corrosion (with free water) |
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(H2S and/or CO2) |
Safety (H2S content) |
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Gas Calorific Value (CO2 content) |
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HEAVY COMPONENTS |
Condensation (Transportation line) |
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(C5+) |
Gas Hydrocarbon Dew Point |
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Gas Calorific Value (too high C5+ content) |
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Hydrates at 25°C = gas + water
DIRTY ICE : water lattice in which methane, ethane, propane, butane, CO2, H2S molecules are embedded (CLATHRATES) Specific gravity = 0.96 to 0.98
Normally form with hydrocarbon stream containing free water dispersed or not, but may form in hydrocarbon gases saturated with water vapor without free water
STABLE AT HIGH PRESSURE ( >10 bar ) AND LOW TEMPERATURE ( < 25 °C )
BLOCK flowlines, chokes, valves, instrumentation
FOUL and PLUG heat exchangers ERODE chokes, control valves, turbo expander
REMOVING HYDRATE PLUGS BY DEPRESSURISATION
CAN REQUIRE DAYS OF FLOW INTERRUPTION
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Hydrates = gas ice
H20 particles around CH4
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GAS TREATMENT
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DEHYDRATION: GLYCOL UNIT PRINCIPLE
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DEHYDRATION: ON SITE TEG UNIT
Saih Rahwl – Oman, 1998 "One of the biggest glycol units in the world"
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PRODUCTION WATER TREATMENT
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SIMPLE GRAVITATIONAL TECHNIQUES: API TANK
HC recoveryLevel maintenance
Tranquillisation Settling
Inlet compartment |
Basin proper |
Outlet compartment |
T Residence 1 hour minimum
EXAMPLE: for 3000 m3/d ≈ 25 m long
≈ 3 m wide ONSHORE ONLY!!!!!
≈ 2 m depth
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