Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
  • F04B47/06—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth
  • F04B47/08—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps having motor-pump units situated at great depth the motors being actuated by fluid
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04B15/06—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts for liquids near their boiling point, e.g. under subnormal pressure
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/14—Pistons, piston-rods or piston-rod connections
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
  • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
  • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
  • F04B9/109—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers
  • F04B9/117—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other
  • F04B9/1172—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having plural pumping chambers the pumping members not being mechanically connected to each other the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor

Definitions

• the invention relates to a device for pumping a multiphase fluid in particular suitable for the production of hydrocarbons in an environment where human intervention is difficult, if not impossible, and which requires, among other things, high reliability of the equipment. .
• the invention applies, in particular, to the production of hydrocarbons from at least one submerged wellhead equipping a deposit, such as a deposit located offshore, these hydrocarbons comprising a multiphase mixture, generally gas- hydrocarbon-water liquid, under pressure.
• the invention also applies, in particular, to the production of hydrocarbons from at least one wellhead arranged in an environment difficult to access, such as virgin forest.
• the device according to the invention allows in particular the pumping of a liquid phase and a gaseous phase in a single pipe and thereby avoids the use of a phase separator and two separate pipes for conveying fluids pumped separately.
• the device according to the invention is also suitable for pumping a multiphase fluid comprising a dispersed solid phase, such as sand or rock debris. It is known to use multiphase rotary pump-compressors, but their cost is very high and their performance moderate, in particular because of the significant friction losses, these losses being inter alia linked to the high speed of rotation and the volumes pumped.
• the device according to the present invention makes it possible to pump multiphase fluids while retaining good efficiency.
• the multiphase fluid pumping device comprises in combination a supply line for the fluid to be pumped and a delivery line for the pumped fluid, at least a first variable-volume chamber adapted to pump the fluid, this chamber is defined by a first cylinder head, a first cylinder and a first piston.
• the piston moves along the longitudinal axis of the cylinder in said cylinder.
• the device according to the invention further comprises at least a first motor member adapted to move said piston in said cylinder, and a casing enveloping at least the space swept by the piston, this space is placed opposite to said chamber with respect to to the piston.
• This housing contains a gaseous fluid.
• the first drive member may be a first hydraulic cylinder.
• the device according to the invention may include a second variable volume chamber adapted to pump said fluid.
• This second chamber is defined by a second cylinder head, a second cylinder and a second piston.
• the second piston moves along the longitudinal axis of said second cylinder in said second cylinder.
• the casing further envelops the space swept by the second piston, this space being opposite the second chamber relative to said second piston.
• This device may also include a second hydraulic cylinder, the first cylinder being secured to the first piston, the second cylinder will be secured to said second piston.
• it may include means for controlling the first and second actuator adapted to reduce the volume of the first chamber while increasing the volume of the second chamber and adapted to reduce the volume of the second chamber while increasing the volume of the first bedroom and this alternately.
• the control means can trigger an increase in the volume of one of the two chambers only if the other of the two chambers has reached its maximum volume, and the control means can trigger a reduction in the volume of a chamber only if the the other of the two bedrooms has reached its maximum volume.
• the device according to the invention may comprise a high pressure generator delivering hydraulic fluid under high pressure and a low pressure generator delivering hydraulic fluid under a pressure lower than said high pressure, said high pressure generator supplying each of said cylinders when they produce a reduction in the volume of their associated chamber, said low pressure generator supplying each of said jacks when they produce an increase in the volume of their associated chamber.
• Said casing according to the invention can be closed and communicate only with the suction pipe or only with the discharge pipe.
• the device according to the invention may have the first or the second actuator which comprises a body, this body possibly being at least partially outside the casing.
• the device according to the invention may include several pumping chambers, but in even number.
• the casing may be waterproof.
• the above device could advantageously be applied to the pumping of petroleum effluents, and in particular to the aquatic production of these effluents, such as marine production, the device being located at the bottom of an aqueous medium as well as to terrestrial production in a hostile medium. .
• the present invention also relates to a multi-phase fluid pumping device which comprises, in combination, a supply line for the fluid to be pumped and a delivery line for the pumped fluid, at least one variable-volume chamber adapted to pump the fluid, this chamber being defined by a cylinder head, a cylinder and a piston.
• the piston moves along the longitudinal axis of the cylinder in the cylinder.
• the piston has a housing opening onto an upper part of the piston, and the cylinder head has a projection penetrating into said housing when said piston approaches said cylinder head.
• the piston and the cylinder head cooperate together to produce a jet of fluid directed towards at least one exhaust orifice of said multiphase fluid.
• the housing and the projection may have substantially complementary frustoconical shapes.
• the housing and said projection may be arranged in the vicinity of the axis of said cylinder.
• the chamber may include a fluid supply orifice disposed at the top of said projection.
• the cylinder head may comprise at least two exhaust orifices arranged at substantially equal distances from the axis of said cylinder.
• FIG. 1 shows a partial sectional view of the pumping device according to the invention
• FIG. 2 shows an overall sectional view of a device comprising four pumping elements and arranged in a pumping module in particular suitable for underwater production, and
• FIG. 3 shows schematically the hydraulic control of two cylinders of the pumping device.
• the reference 1 designates as a whole a first pumping element of the device according to the invention, the reference 1a being relative to a second pumping element of this same device identical to the first element.
• This pumping element 1 comprises a chamber 2 delimited by a cylinder head 3, a cylinder 4 and a piston 5.
• the piston 5 slides in the cylinder 4 by means of a jack 6 coupled by the rod 7 of the jack 6 and an axis 8
• the piston includes sealing means 9, such as segments or such as lip seals used for example on the mud pump pistons, which cooperates with the cylinder 4 to ensure the compression of the fluid.
• the cylinder head 3 has a projection 10 located on the axis of the frustoconical cylinder flared at its base 10a, and a fluid supply port 11 at its top 10b.
• the supply orifice 11 comprises a seat which is closed by a valve 12 during the filling phase of the chamber 2 so as to allow the flyid from the supply duct 13 to penetrate therein.
• the fluid enters the chamber because of the difference in the pressure forces existing on either side of the valve 12 and which is sufficient to oppose the return means 14 of the valve 12.
• the fluid which is compressed by reducing the volume of chamber 2, escapes from chamber 2 through four discharge orifices 15 provided with non-return valves 16 comprising valves 17 cooperating with seats integral with the cylinder head and springs 18 ensuring the obturation of the evacuation orifices during the supply phase of the chamber 2.
• the evacuation orifices 15 are connected to an evacuation pipe 19.
• the projection 10 penetrates into the housing 20 of the piston so as to produce a jet of fluid directed towards the discharge orifices 15.
• the substantially complementary and frustoconical shapes of the housing 20 and of the projection 10 allow the production of a high speed jet on the walls of the housing 20 of the piston 5, of the cylinder head 3 (in particular of its projection 10) and of the cylinder 4 so as to facilitate the evacuation of the fluid and the cleaning of deposits which would become encrusted there in the absence of this advantageous arrangement.
• the central arrangement of the projection 10 and of the housing 20 also allows a distribution of the fluid, as soon as it is introduced into the chamber, favorable to its compression.
• the jack 6 is connected through two orifices 21 and 22 to hydraulic generators adapted to produce the movements of the jack and the variations in volume of the chamber 2.
• the element 1 of the pumping device further comprises a casing, designated 23 as a whole, which envelops the space swept by the piston 5 and opposite with respect to the piston 5, to the chamber 2, as well as the free space between the piston and the body or fixed part of the cylinder 6.
• This casing 23 communicates with the homologous casing 23a of the pumping element 1a.
• the housings 23, 23a of the elements contain gaseous fluid, the pressure of which is in particular adapted to reduce or even cancel the leaks of multiphase fluid between the chamber 2 and the casing, and / or to reduce the thickness of the casing or housings 23, 23a. .. having to withstand any hydrostatic pressure from the environment surrounding the pumping device.
• this external pressure can be that produced by a seawater column 1000m high.
• this pressure can be that of the supply line or that of the discharge line.
• the casing can be connected to, or even traversed by, one or the other of these pipes. Fluid leaks between the chamber 2 and the casing 23 can then mix with the pumped or pumped fluid.
• crankcase we can also pressurize the crankcase at a pressure close to the external pressure, however gas leaks from the crankcase to the pumping chamber means that the gas must be renewed. This renewal requires, when the device is used underwater at great depth, a gas generator which complicates the operation of the device while reducing its reliability.
• FIG. 2 shows in section a pumping device comprising four elements and arranged in a pumping module which can be submerged at the bottom of the sea, for example to a depth of 100m.
• the pumping module 25 is adapted to be positioned on a base 26 by means of four guide posts integral with the base cooperating with guide cones integral with the module. the descent of this module on the base is guided by guide lines mounted at the tops of the posts, the lines cooperating with said guide cones.
• This connector 27 cooperates with a collar 28 integral with the pumping module 25. From this collar 28, the supply line 13 joins the casing 23 of the first pumping element. The pumped fluid passes through the casings 23 and 23b of a third pumping element as well as the assembly flange 24 before being led by the line 13 to a distribution box 29 which distributes the fluid in each of the pumping chambers.
• the fluid leaves the different chambers via the pipes 19, collects in different collection boxes 30, 31 before being directed, still through the discharge pipe to the collar 28 and the connector 27.
• the pumping module further comprises a hydraulic unit 32, an electrohydraulic container 33, a flexible tarpaulin container 34 and an electronic container 35 all arranged under the pumping chambers between the bodies of the jacks.
• the hydraulic unit 33 transforms the electrical energy coming from the surface into hydraulic energy allowing the displacements of four jacks (6, 6a, 6b and that not shown).
• the electro-hydraulic container 32 distributes the hydraulic fluid between the hydraulic unit 33 and the jacks 6, 6a, 6b, and that not shown.
• the flexible tarpaulin container 34 serves as an expansion tank and as a storage tarpaulin for the hydraulic fluid.
• the electronic container 35 includes the control and measurement circuits of the various sensors, valves of the pumping module.
• the container 35 comprises in particular the circuits for controlling the movements of the jacks, the openings and closings of the valves, the electronic circuits of the pressure, temperature, flow and pollution sensors.
• the upper part of the module includes a shield 36 ensuring the protection of the module against falling objects such as drill pipes.
• the conical shape of the shield 36 makes it possible to use its concave part 37 as an oil trap against pollution.
• the shield 36 is surmounted by a connector 38 allowing the pumping module to be maintained and manipulated by a cable or by a string of rods. the fixing of the various members of the module and the rigidity of the latter is ensured in particular by the support tubes 39, the floors 40, 41, 42.
• Figure 3 shows schematically the hydraulic control of two cylinders 6, 6a associated with the control device.
• the actuators of the device are paired so that the pressure in the casing does not vary due to variations in the volume of the fluid therein, the variations in volumes being produced by the movement of the pistons in the cylinders.
• the hydraulic power unit comprises a high pressure hydraulic generator 50 with a flow rate that can vary but operates at a constant flow rate for given production conditions of the multiphase fluid.
• This generator 50 supplies the hydraulic energy (1 MW) necessary for pumping the fluid during the compression-evacuation phase.
• the power station further comprises a hydraulic generator 51 with a flow rate that can vary but used at a constant flow rate for the aforementioned production conditions.
• This generator 51 provides the energy necessary to supply the chambers 67 for returning the actuator rod and to increase their volume.
• a hydraulic servo generator 52 supplies the fluid necessary for controlling the distribution of the hydraulic fluid of the jacks. These three generators 50, 51, 52 are driven by a motor 53 arranged in an equipression enclosure with the hydraulic unit. 32 in which he is found.
• Each of these generators 50, 51, 52 is provided with a filter having a safety bypass 50a, 51a, 52a respectively and with a differential valve 50b, 51b, 52b limiting the discharge pressure.
• the suction of these pumps is carried out through a filter 54 having a safety bypass in the enclosure of the hydraulic unit 32 serving as a rigid cover for the hydraulic fluid.
• This rigid cover is connected to a flexible cover 55 placed in the container 34.
• Each of the jacks 6, 6a comprises end-of-travel sensors, 56a, 57a, 57a, for example of the magnetic type, which allow the movements of the jacks to be controlled by one another.
• This center 59 which is supplied with hydraulic fluid by the pump 52 and the capacity 60 disposed in bypass of the pump, controls the operation of the distributors 61, 62, 63, 64 by a hydraulic outlet 65.
• These distributors are of a fast switching type so as to avoid the water hammer which would be induced by the changes in the movements of the jacks.
• the distributors alternately communicate the chambers of each of the jacks with the return 66 to the tank, and either the high pressure generator 50 or the low pressure generator 51.
• FIG. 3 shows schematically the operation of the control during the extension of the cylinder 6 and the narrowing of the cylinder 6a, the upper chamber 67 of the cylinder 6 emptying in the return 66 to the tank, the lower chamber 68 of the cylinder 6 is filling with the fluid from the high pressure generator 50, the upper chamber 67a of the cylinder 6a filling with the fluid from the low pressure generator 51, the lower chamber 68a of the cylinder 6a emptying in the return 66 to the tank.
• the control center produces the switching of the distributors 61, 62, 63, 64 so that the upper chamber 67 is supplied by the low pressure generator 51, the lower chamber 68 empties into the return 66, the upper chamber 67a empties into the return 66 and the lower chamber 68a is supplied by the high pressure generator 51.
• the central unit controls the switching of the distributors 61, 62, 63, 64 which is found in the arrangement shown diagrammatically in FIG. 3.
• the return 66 to the tank is provided with a filter 69 comprising a safety bypass and an exchanger 70 adapted to cool the hydraulic fluid.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Reciprocating Pumps (AREA)
• Jet Pumps And Other Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9365962

Family Applications (1)

Country Status (7)

Cited By (1)

Families Citing this family (3)

Family Cites Families (9)

• 1988
  • 1988-05-02 FR FR8805959A patent/FR2630785B1/fr not_active Expired - Lifetime
• 1989
  • 1989-04-26 WO PCT/FR1989/000198 patent/WO1989011038A2/fr active IP Right Grant
  • 1989-04-26 DE DE68916765T patent/DE68916765T2/de not_active Expired - Fee Related
  • 1989-04-26 EP EP89905416A patent/EP0373202B1/de not_active Expired - Lifetime
  • 1989-05-02 CA CA 598411 patent/CA1338695C/fr not_active Expired - Fee Related
  • 1989-12-28 NO NO895300A patent/NO306075B1/no not_active IP Right Cessation
• 1990
  • 1990-01-02 DK DK199000004A patent/DK173571B1/da not_active IP Right Cessation

Non-Patent Citations (1)

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