6 - nitrogen pumping

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  • Italfluid Egypt ConfidentialNitrogen Pumping

    INTRODUCTION TONITROGENPUMPING

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Overview

    Nitrogen characteristics

    Nitrogen pumping unit - Operating instructions and main components

    - Operations (Tanks filling, Assembly and Tests, Cool-down, Pumping)

    Main applications in oilfield:- Pressurizations, Replacement/Purging, Gas lift

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen characteristicsNitrogen:Nitrogen: odourless, colourless, and inert gas, present in nature at elementary

    state; indeed it constitutes 78% of the earth atmosphere in wich molecule N2 can be found.

    Chemical symbol NAtomic number 7Atomic weight 14,007Fusion temperature -210 CBoilling temperature -196 CGas density 1,251 Kg/m3

    Liquid density 808,2 Kg/m3

    Critical temperature 126,1K (-147,1C)Critical pressure 34,6 bar

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Industrially, nitrogen is prepared through fractioned distillation of liquid air

    Nitrogen characteristics

    On the market, nitrogen can be found in: Gaseous state, stored inside gas-cylinders with pressure of 150-200 bar Liquid state, stored in boiling state, inside special thermal insulated tanks at

    -196C with pressure of 3 bar

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unit

    Nitrogen PumpNitrogen Pump

    Nitrogen TankNitrogen Tank

    Pipes and componentsPipes and components

    Operating instructions and main component

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Cryogenic unit which pumps liquid nitrogen at very low temperature (-196C) and pressures up to 10000 psi, and coverts it into a gas (max 70C) by means of vaporizer

    Nitrogen pumpNitrogen pump

    Operating instructions:

    Main components:

    Engine / Transmission

    Return and suction manifold section - Liquid nitrogen suction line system - Tanks return line system

    Triplex pump section - Cold ends - Warm end

    Intake manifold section (high pressure line system) - Liquid nitrogen high pressure line system - Vaporizer - Gaseous nitrogen high pressure line system

    Coolant circuit (water brake)

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumpNitrogen pump

    Nitrogen pumping unitOperating instructions and main component

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Engine / TransmissionEngine / Transmission It supplies the necessary power for the movement of the triplex pump, and to carry out additional functions

    It is directly connected to the waterbrake and different hydraulic pumps

    Hydraulic pumps supply power to the hydraulic engines of the circuits of the triplex pump, centrifugal pump, coolant and lubrication

    It is equipped with air start-up

    The compressor, activated by diesel engine, keeps the pressure of the air circuit around 8 bar

    Main components

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Return and suction manifold sectionReturn and suction manifold section(Low pressure line system)(Low pressure line system)

    A line is present at the outlet side of the centrifugal pump (centrifugal pump's recirculation) which by-passes the triplex pump for the recirculation of the liquid nitrogen inside the tank during the cool-down phase

    It is connected to the intake line of the nitrogen tank through cryogenic flexible pipes

    Liquid nitrogen suction line system:

    It supplies liquid nitrogen to the triplex pump with a pressure of 40-100 psi

    A centrifugal pump (boost pump) is installed on the line, in order to bring the liquid nitrogen from the pressure outgoing from the tank (generally 10-20 psi) to that entering the triplex pump (40-100 psi)

    Nitrogen pumps are usually equipped with a by-pass line of the boost pump

    Main components

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Return and suction manifold sectionReturn and suction manifold section(Low pressure line system)(Low pressure line system)

    It is connected to the nitrogen tanks return line through cryogenic flexible pipes

    Tanks return line system:

    It allows the return of non-pumped liquid nitrogen inside the tank

    A quick cool-down line is installed on the line to fill the pump

    A line is installed on the outlet of triplex pump for the recirculation of liquid nitrogen during cool-down phase

    Main components

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Triplex pump sectionTriplex pump section

    Those are pistons that suck liquid nitrogen with low pressure and discharge liquid

    nitrogen with high pressure. The cold ends are connected and guided by the warm end

    Cold ends:

    It is a 3-piston pump, whose task is to increase the pressure of liquid nitrogen until a maximum operating pressure of 10000 psi

    It is enabled through the hydraulic transmission: the diesel engine enables a pump with variable displacement which convoys the oil under pressure to the engine with fixed displacement

    The speed of the triplex pump (and therefore the nitrogen output) is regulated by changing the displacement of the pump with variable displacement

    It is made up by the following parts:

    Warm ends:

    It is the section that guides the cold end

    Main components

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Intake manifold sectionIntake manifold section(High pressure line system)(High pressure line system)

    It is constituted by lines outgoing from the triplex pumps cold ends (intake lines)

    Liquid nitrogen high pressure line systemIt is the line section that connects the cold ends to the vaporizer; the nitrogen that flows inside is pressurized but still at liquid state

    Main components

    It is made up by the following parts:

    Gaseous nitrogen high pressure line system

    Vaporizer

    It is that line section outgoing from the vaporizer; the nitrogen that flows is pressurized and at gaseous state, ready to be pumped; a plug valve (hydraulically actuated) is installed at the end of this line

    It is a particular heat exchanger, constituted by a cylindrical chamber filled up by a pipe bundle inside of which liquid nitrogen flows. The coolant fills the chamber and flows around the coiled tubes at a pressure of 80-150 psi. When the liquid nitrogen (-196C) circulates through the coil, it changes into gaseous state.

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Intake manifold sectionIntake manifold section(High pressure line system)(High pressure line system)

    Main components

    The temperature of gaseous nitrogen is controlled by the coolant's output and temperature. The gas temperature is kept between 60 and 70F (15-20C). The temperature of the coolants circuit is controlled manually to keep the vaporizers temperature constant between 100 and 120F (38-49C).

    The output of the outgoing gas is measured in scfm (standard cubic feet per minute) or in Nm3/min (normal cubic metres per minute)

    A line is present at the cold ends outlet which allows the liquid nitrogen, by opening a proper valve (tempering valvetempering valve), to by-pass the vaporizer and convoy liquid nitrogen inside the line (to use only in case of extreme need to rapidly cool the out flowing nitrogen)

    Another line, always mounted at the outlet of the cool ends, allows to re-circulate the liquid nitrogen inside the tanks by opening a specific valve (prime valveprime valve) during the cool-down operation

    Nitrogen pumpNitrogen pump

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumpNitrogen pump

    Nitrogen pumping unitOperating instructions and main component

  • Italfluid Egypt ConfidentialNitrogen Pumping

    Nitrogen pumping unitOperating instructions and main component

    Coolant circuitCoolant circuit

    Main components

    It is a water-glycol recirculation system that supplies (through thermal exchange with the vaporizer) the heat needed to cause the evaporation of the liquid nitrogen. The circulation of fluid inside the circuit takes place through a water pump enabled by a hydraulic engine.

    The coolant (water-glycol) draws heat from the following sources:

    WaterbrakeHydraulic circuit

    Lubrication circuits of

    triplex pump, etc.

    Engines cooling circuitIt is a hydraulic brake assembled on an axis of the engines power take-off.By sending liquid to the waterbrake, the engine goes under load, and in this way, the engines power is converted in heat.

    The coolant, flows through the coolant/hydraulic oil heat exchanger, from which it draws heat. In a cold environment, a reverse thermal exchange is possible: the coolant, heated up by the waterbrake, transfers heat to the hydraulic oil; this allows a quicker heating up of the unit.

    The exchange between the two circuits takes place throug

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