NS Services Well

Nitrogen Unit

Nitrogen pumping unit AP-II

THIS NITROGEN PUMPING UNIT  IS MOUNTED ON A TRAILER AND CONSISTS OF THREE MAIN COMPONENTS; STORAGE TANK, PUMPING SYSTEM AND HEATER (VAPORIZER).

Liquid nitrogen is stored in a special pressure vessel at -1950 C. (-3200 F.). The vessel is actually no more than a large twin shelled "thermos bottle. The inner tank is a stainless steel pressure vessel which holds the liquid nitrogen. While the outer steel shell provides the insulating space on which a near vacuum is drawn. Approximately 8" of special "perlite" insulation and polished inner surfaces further help reduce radiant heat transfer. Liquid nitrogen in storage does loose a small percentage of product continuously to vaporization, but can be stored for an extended number of weeks with minimal product loss. Liquid nitrogen from the tank flows to a "boost pump" through stainless steel pipes. This boost pump is a hydraulic centrifugal pump with cryogenic liquid handling capabilities. The boost pump raises the pressure of the liquid nitrogen up to 827 kPa (120 PSI). The nitrogen at 827 kPa (120 PSI) is then fed to a high pressure cryogenic pump. This pump is a positive displacement "Triplex" pump that can deliver pressures up to 10,000 PSI (70 mpa). The "Triplex" pump raises the pressure of the liquid nitrogen up to required working pressures. From the high pressure pump the liquid nitrogen is forced through a series of stainless steel coils which are heated by hot air from a diesel burner. The liquid nitrogen in these coils absorbs heat and is gasified. This gaseous nitrogen at 100 - 650 C. (500 – 1500 F.) is the final product which flows down the line for its various service applications.

WTS-NitrogenUnit-1

APPLICATIONS OF NITROGEN PUMPING UNIT   AP-II

ACIDIZING AND FRACTURING:        

  • N2 added to fluids promotes flow back without swabbing. 
  • Quicker return to production, better clean-up, improved productivity will result. 

DRY SHOOTING:

  • N2 displacement of well fluids prior to perforating eliminates swabbing, prevents formation contamination and reduces rig time. 

HYDRAULIC PERFORATING:

  • N2 gives up to 300 percent increase in penetration, results in greater well production and reduces the need, in some cases, for stimulation.

KICKING A WELL IN:

  • For completion, swabbing is eliminated, and rig time is reduced when the well is brought in by circulation with N2 gas. 

OPERATING TOOLS AND PACKERS:

  • Use of N2 eliminates failures during setting ef inflatable packer, prevents dilution orcontaminationofformation fluids. 

CORROSION INHIBITION

  • N2 greatly increases speed of treatment, provides uniform inhibitor contact, eliminates swabbing. 

DRILL STEM TESTING:

  • N2 eliminates sample contamination and reduces packer failures during drill stem testing, providing a true sample of reservoir fluids. 

GASEOUS DRILLING:

  • N2 drilling eliminates danger of downhole explosions, and reduces compression requirements.

COMBATTING LOST CIRCULATION:

  • N2 quickly reduces mud column weight yet gives easy removal of gas when mud weight needs to be restored. In related industries to the oilfield, nitrogen is seeing increasing application in natural gas plants, refineries and pipelines. 

PURGING:

  • Inert N 2. used for purging of vessels and pipelines eliminates internal explosion hazard during start ups or facility repairs. 

PRESSURE TESTING:

  • N2 provides a quick, dry test without internal explosion hazard, and with no test fluids left in lines or vessels. 
NITROGEN PUMPING UNIT  
Manufacturer CANADIAN FRACMASTER LTD.
Model Trailer mounted nitrogen unit 055
Serial number CFM 01988001
Year of production  1988.
Weight with liquid nitrogen 23 810 Kg
Weight without liquid nitrogen 15 350 Kg

 

TRAILER  
Manufacturer FRUEHAUF
Serial number 2H8V03629KT000101
Number of axles two/td>
Number of tires eight + one
Dimension of tires 11 X R22.5
Pressure in tires 700 Kpa

 

NITROGEN PUMING UNIT CAPACITY  
Volume of gaseous nitrogen for cold end ID 2" 15 300 Sm 3 /h on 686 bar
Volume of gaseous nitrogen for cold end ID 2.5" 9 300 Sm 3 /h on 535 bar

 

CRYOGENIC STORAGE TANK  
Manufacturer LOX EQUIPMENT COMPANY
Serial number 30197
Tank volume 11.35 m 3 (3000 gal.)
Maximum work volume of liquid nitrogen 10.2 m 3
Weight of liquid nitrogen 8230 Kg
Gaseous nitrogen volume 7000 Nm 3
Pressure in tank during storage and transport 105 Kpa (15 psi)
Working pressure 275 Kpa (40 psi)
Test pressure 440 Kpa (64 psi)
Vacuum between walls of tank 1 – 10 Pa
Nitrogen storage lost 40 – 80 kg/day

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BOOST PUMP  
Manufacturer AIRCO CRYOGENICS 
Type 1 1/2"  x 2 1/2" x 6"
Serial number 88659931
Maximum pressure 827 Kpa (120 psi)
Maximum flow rate 378 l/min (100 GPM)
Maximum power 5.5 Kw (7.5 Ks)
Hydraulic drive motor VOLVO F11-5
Hydraulic pressure 13 790 Kpa (2000 psi)

HIGH PRESSURE "TRIPLEX" PUMP  
Manufacturer AIRCO CRYOGENICS 
Type 3-LMPD with gear box
Serial number 821434719
Gear box ratio 1:2.615
Maximum RPM 900 rev./min
Maximum power 350 Kw (476 Ks)
Pistons stroke 50.8 mm (2")
Piston OD 50.8 mm (2") and 63.5 mm (2.5")
Maximum LN 2 flow rate 236 l/min and 370 l/min
Maximum WP 686 bar (10 000 psi)
Lube pressure 410 – 550 Kpa ( 60-80 psi)
Oil volume 180 l

VAPORIZER BURNERS   
Fan Centrifugal with hydraulic motor
Hydraulic pressure 13 790 Kpa ( 2000 psi)
Maximum RPM 2700 rev./min
Combustion chamber Single chamber with turbulent blend
Maximum fuel pressure 3445 Kpa (500 psi)
Fuel consumption @ 3 flames 284 l/h ( 75 gal/h)
Fuel Diesel
Vaporizer section With stainless steel coiled tubes manifold
Serial number 81133641
Maximum pressure 137 Mpa

ENGINE  
Manufacturer DIESEL ALISON
Type GM 12V-71
Serial number 12VA083037
Power 360 Kw (480 Ks) on 2100 rev./min
Maximum fuel consumption 100 l/min
Oil pressure 105 – 5480 Kpa (15 – 80 psi)
Oil volume 59 l (15.5 gal.)
Cold fluid volume 113 l (30 gal.)
Fuel reservoir 1135 l (300 gal)

TRANSMISSION  
Manufacturer DIESEL ALISON
Type CLT 755
Serial number 2510123557
Maximum power 317 Kw (425 Ks) on 2100 rev./min
Oil pressure 890 – 1710 Kpa (130-250 psi)
Oil volume 76.5 l (18 gal.)

HYDRAULIC SYSTEM  
Oil pump Three section
Manufacturer COMMERCIAL SHEARING
Type P50B27860Y615-11BV1C12-1CP30A291SPAB05-22
Oil volume 378 l (100 gal.)