Product and operations
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 liquidnitrogen. 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. Liquidnitrogen 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.
APPLICATIONS OF NITROGEN PUMPING UNIT AP-II
CIDIZING AND FRACTURING:
N2 added to fluids promotes flow back without swabbing. Quicker return to production, better clean-up, improved productivity will result.
N2 displacement of well fluids prior to perforating eliminates swabbing, prevents formation contamination and reduces rig time.
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.
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.
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.
Inert N 2. used for purging of vessels and pipelines eliminates internal explosion hazard during start ups or facility repairs.
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|
|Year of production||1988.|
|Weight with liquid nitrogen||23 810 Kg|
|Weight without liquid nitrogen||15 350 Kg|
|Number of axles||two|
|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|