NGL EXTRACTION SPE - BACK TO BASICS. Ed Wichert Sogapro Engineering Ltd. September 27, 2011
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2 NGL EXTRACTION SPE - BACK TO BASICS Ed Wichert Sogapro Engineering Ltd. September 27, 2011
3 DEFINITIONS NGL - C 2+ LPG - C 3 and C 4 LNG - C 1 Condensate - plant inlet separator hydrocarbon liquid Pentanes-Plus - C 5+ (stabilized condensate)
4 TYPICAL GAS ANALYSIS NGL LPG C 5+
5 CHARACTERIZATIONS Dry Gas Lean Gas Rich Gas Wet (hydrocarbon) Gas Solution Gas Sales Gas or Residue Gas
6 TYPICAL GAS COMPOSITIONS, MOLE PERCENT Component Dry Gas Rich Gas Wet Gas (reservoir comp.) Solution Gas Sales Gas H He N CO H 2 S C C C ic nc ic nc C C Total
7 WHY EXTRACT NGL? Meet Sales Gas Specifications (TCPL) -10 degrees C (at kpa) Make Money
8 NGL EXTRACTION METHODS Short Cycle Dry Desiccant Adsorption Cooling Joule-Thomson Expansion Refrigeration With glycol With methanol Turbo-Expander Lean Oil Absorption
9 RULES OF THUMB REGARDING EXTRACTION PROCESSES For hydrocarbon dewpoint control only: Short cycle adsorption Joule-Thomson expansion Refrigeration to about 20 ⁰C For basic NGL recovery: Refrigeration to about 20 ⁰C Lean oil absorption at ambient temperature Turboexpander without external refrigeration For high NGL recovery, including ethane: Turboexpander Refrigeration to about -30 ⁰C Refrigerated lean oil absorption (not suited for ethane recovery). All require economic comparisons
10 SCHEMATIC OF SHORT CYCLE ADSORPTION PROCESS EQUIPMENT. Regen. Gas Flow Controller Inlet Gas Cooler Separator Adsorption Cooling Heating Water and Condensate Sales Gas Heater
11 SCHEMATIC OF JOULE-THOMSON PROCESS EQUIPMENT Heat Exchanger LT Separator TC Inlet Gas Choke Inlet Separator Sales Gas Gas to Recycle Heater Condensate/Glycol Glycol Separator Reconcentration Condensate to Stabilizer
12 SCHEMATIC OF REFRIGERATION PROCESS EQUIPMENT Sales Gas Propane Chiller Well Production Gas/Gas Heat Exchanger Cold Separator Propane Plant Inlet Separator To Water Tank To Stabiliser Glycol Injection To Fractionator Flash Tank Filter Glycol Regeneration
13 TYPICAL HEAT EXCHANGE AND PROPANE CHILLER EQUIPMENT
14 Prosernat/IFP Group Technologies, Wikipedia
15 SCHEMATIC OF IFPEXCOL PROCESS EQUIPMENT Sales Gas Propane Chiller Well Production Cont r Gas/Gas Heat Exchanger Cold Separator Propane Plant Inlet Separator To Water Tank To Water Tank To Stabiliser To Fractionator Methanol Injection Methanol Storage
16 SCHEMATIC OF TURBOEXPANDER PROCESS EQUIPMENT Recompressor Sales Gas Expander / Compressor Gas Pretreatment (sweetening, drying) Inlet Gas Inlet Separator Primary Chiller Chiller Separator Demethanizer Demethanizer Reboiler Ethane-plus to Fractionation Train
17 SCHEMATIC OF TURBOEXPANDER PROCESS EQUIPMENT Sales Gas Recompressor Separator Expander/ Compressor - 60 C, 3000 kpa Reflux Drum C3 Refrig. Separator Demethanizer Inlet Gas Heat Exchanger - 10 C - 30 C 6200 kpa Heat Exchanger Reboiler Ethane-plus to Fractionation train
18 D. J. Morgan, O&GJ May 3/76 pp
19 VIEW OF TURBOEXPANDER EQUIPMENT
20 VIEW OF TURBOEXPANDER EQUIPMENT
21
22 SCHEMATIC DRAWINGS OF DIFFERENT FRACTIONATION PROCESSES Butane and Lighter Overhead Ethane and Lighter Overhead Feed from Inlet Separator Schematic of Stabilizer Operation Feed from Refrigeration Process Schematic of De-ethanizer Operation C5+ C3+ Product Ethane and Lighter Overhead Propane and Butane Mixture (LPG) Feed from Refrigeration or Turboexpander Process DE-BUTANIZER Schematic of LPG and C5+ Recovery C5+ Product
23 SCHEMATIC DRAWING OF DIFFERENT FRACTIONATION PROCESSES (cont d) Ethane and Lighter Overhead Propane Butane Feed from Refrigeration or Turboexpander Process DE-BUTANIZER C5+ Product
24 SCHEMATIC DRAWING OF DIFFERENT FRACTIONATION PROCESSES (cont d) Ethane and Lighter Overhead Propane Butane Feed from Refrigeration or Turboexpander Process DE-BUTANIZER C5+ Product
25 SCHEMATIC DRAWING OF FRACTIONATION PROCESS EQUIPMENT From De-Ethanizer Source: Part of Chart in O&GJ, June 6, 2011
26 Picture of fractionation tower
27 SCHEMATIC DRAWING OF LEAN OIL ABSORPTION PROCESS Gas to Recycle Sales Gas Reflux Lean Oil Lean Oil Absorber Cooler Stripper Condensate to Fractionator Inlet Gas Lean Oil Tank Heat Rich Oil
28 PHASE DIAGRAMS Representation of dewpoint, bubblepoint and liquid fractions versus pressure and temperature for a gas composition Quickly visualize the level of liquid formation for selecting the desired operating conditions of pressure and temperature for refrigeration
29 TYPICAL GAS COMPOSITIONS, MOLE PERCENT Component Dry Gas Rich Gas Wet Gas (reservoir comp.) Solution Gas Sales Gas H He N CO H 2 S C C C ic nc ic nc C C Total
30
31
32 50 % 20 % 10 % 5 %
33 50 % 20 % 10 % Cooling Path
34 WHY EXTRACT NGL? Meet Sales Gas Specifications (TCPL) -10 degrees C (at kpa) Make Money Demonstrate NGL value with Excel Spreadsheet
35 WHAT ABOUT RESERVOIR CYCLING? Reservoir pressure will drop with production Pressure will drop below dewpoint pressure at reservoir temperature, resulting in loss of heavy components Enhance recovery of NGL s by reservoir cycling
36
37
38 SCEMATIC OF TYPICAL RESERVOIR CYCLING SYSTEM Well production and gathering system Gas Treating Plant - Inlet separation - NGL recovery - Dry gas compression and injection Gas injection wells
39 RESERVOIR CYCLING SCHEMES Major reservoir cycling schemes of the past Kaybob Units 1, 2 and 3 Carson Creek Windfall Brazeau Requirements Wet (hydrocarbon) gas Reservoir quality Large price difference between gas and NGL s
40 CONCLUSIONS Different methods are available for extracting NGL s from natural gas All of the highlighted methods are being used in Alberta At current price difference between oil and gas it is profitable to extract NGL s Energy equivalence: 1 Bbl of oil 6 Mscf of gas (BOE) Monetary equivalence: 1 Bbl of oil 20 Mscf of gas (currently).
41 THE END
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