EP0435716B1 - Vorrichtung zur Separation eines Gas-Flüssigkeitsgemisches als Zufuhr einer Imbohrlochpumpe - Google Patents

Vorrichtung zur Separation eines Gas-Flüssigkeitsgemisches als Zufuhr einer Imbohrlochpumpe Download PDF

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Publication number
EP0435716B1
EP0435716B1 EP90403476A EP90403476A EP0435716B1 EP 0435716 B1 EP0435716 B1 EP 0435716B1 EP 90403476 A EP90403476 A EP 90403476A EP 90403476 A EP90403476 A EP 90403476A EP 0435716 B1 EP0435716 B1 EP 0435716B1
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EP
European Patent Office
Prior art keywords
pump
separation
intake
accordance
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90403476A
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English (en)
French (fr)
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EP0435716A1 (de
Inventor
Henri Cholet
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IFP Energies Nouvelles IFPEN
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IFP Energies Nouvelles IFPEN
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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/34—Arrangements for separating materials produced by the well
    • E21B43/38—Arrangements for separating materials produced by the well in the well
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • E21B43/121—Lifting well fluids

Definitions

  • the present invention relates to a device for separating a mixture of gas and liquid, this mixture possibly being constituted by hydrocarbons, at the intake of a pump connected to a lower end of a tubular column at the bottom of a drilled well.
  • Hydrocarbon production installations use, after the installation of wells drilled towards the reservoir of the geological formation, pumping systems intended to bring the oil up to the surface.
  • a tubular column serving as a conduit for producing the hydrocarbons is lowered into the drilled well, at the end of which is a pump.
  • the pumps used can be of different types: piston pumps, centrifugal pumps, hydraulic pumps, balance pumps, rotary positive displacement pumps (commercially called “MOINEAU pump”).
  • the present invention aims to overcome the aforementioned drawbacks by avoiding in a simple and practical manner the dry operation of the pumps.
  • the present invention relates to a device for separating a mixture of free gas and liquid at the intake of a pump connected to a lower end of a tubular column at the bottom of a drilled well, the pump being connected to the tubular column by an intermediate production tube and being introduced into a device fluid inlet with one lower end closed off, said lower end comprising at least one valve and one upper end comprising fluid introduction orifices, said pump being placed inside said intake device, near its lower end.
  • the intake device comprises a cylindrical tube and that the device forming at least one valve (21, 22) is placed on the cylindrical walls of said intake device.
  • the intake device may comprise an intake duct coaxially surrounding the intermediate production tube and the pump, the intake duct being extended by a separation duct provided circumferentially with orifices and held around said tubular column by a piece of fixation.
  • the intermediate production tube and the pump can be kept coaxial with the intake duct by centralizers.
  • the device forming at least one valve may comprise a shutter, such as a ball or a valve, constantly urged by elastic means in blocking of an opening for introducing fluid into the intake duct.
  • the elastic means may have a compression resistance at a minimum pressure, said minimum pressure corresponding to a level of liquid in the intake duct above the pump.
  • the intake duct and the separation duct can be held in the well drilled by stabilizers.
  • the length of the fluid intake device may be chosen so as to develop a pressure difference of a few bars between the intake level of the pump and the level of the orifices for introducing the fluid into said device.
  • the present invention applies to a pumping installation in a drilled well comprising a separation device, has a low zone whose orientation varies from vertical to a steep inclination.
  • FIG. 1 represents a drilled well 1 into which is introduced a pump 3 placed in an active position at the bottom of the well by a tubular conduit or column 2.
  • the drilled well comprises near its surface a practically vertical zone extended downwards by a part deflected to become, at the bottom, strongly inclined in an area with a high content of withdrawable fluid.
  • the present invention applies very particularly in the case of highly deviated wells, but it also retains all of its advantages in the case of vertical wells.
  • the pump 3 fixed at the end of the column 2 is introduced from the surface and progresses into the well by the addition of tubular sections.
  • a set of drive rods 30 placed end to end whose rotation is controlled by a drive head 23 connected to a motor 24 which may be of a type commonly used in pumping installations.
  • the rotation of the rods 30 initiates the pumping device 3 which brings up the fluid circulating at the bottom of the well by the tubular column 2 to be evacuated towards the storage pipes 27.
  • Valves 25 regulate the distribution of the pumped fluid on the surface.
  • Pump 3 is introduced at the end of the column tubular 2 in a separation device 17 aimed at bringing the free gas suspended in the liquid to the surface, while the latter is sucked towards the bottom of the separation device at the inlet of the pump 3.
  • the reference 31 designates a shutter device of the valve type.
  • the lower end of the tubular column 2 at the bottom of the well is attached around its circumference to one end of an intermediate production tube 6.
  • the other end of this intermediate tube is connected to the outlet of the pumping device.
  • a "MOINEAU" type pump is used, but it is understood that the advantages of the present invention would apply equally favorably in the case of a piston pump, a centrifugal pump, or a pendulum pump.
  • the "MOINEAU” pump 3 comprises a stator 4 provided with a tubular protective steel casing, covering an elastomer part or active part of the stator internally producing a helical gear.
  • a set of rods 30 placed end to end is disposed inside the tubular column 2, passes through the intermediate production tube 6, and supports a rotor 5 so as to transmit to it a rotary movement controlled at the surface.
  • This rotor 5 has on its surface a helical gear associated with the stator 4.
  • the pump / intermediate production tube assembly is introduced into an intake duct 7, produced in the form of a tubular pipe open at its two ends.
  • a first end is extended by a separation conduit 8 consisting of a tubular strainer provided with orifices 9 for introducing the fluid inside the conduit 7.
  • the separation duct 8 and the intake duct 7 are connected to each other by a circular ring 15.
  • the separation duct 8 is kept fixed around the intermediate production tube by a connecting member 16, this member comprising a threaded interior zone into which the upper end of the separation duct 8 is screwed.
  • This member 16 also ensures coaxial maintenance and end-to-end positioning of the tubular column 2 and of the intermediate production tube 6.
  • centering devices 10 are placed around these elements. These centering devices are, for example of the blade type, well known in drilling techniques soils. Other types of centralizers can also be used, for example rubber centralizers. These centralizers also have the advantage of limiting the oscillation movement of the pump along a section of the well.
  • Stabilizers 11 of the aforementioned type are also placed around the intake duct 7 to place the assembly in the axis of the well.
  • the lower end of the intake duct is provided with a closure device 31 comprising a part 20 providing a closure in which a valve is formed.
  • This valve consists of a ball 21 constantly urged to block an opening for introducing fluid 23 by elastic means, such as, for example, a helical spring 22.
  • the embodiment of Figure 3 avoids this risk.
  • the device according to this embodiment comprises one or more valves arranged circumferentially on the lateral or cylindrical walls of the lower end of the intake duct, the requisite being to be below the intake level of the pump.
  • the shutter system 32 shown in FIG. 3 comprises two shutter devices 33 and 34 positioned under the pump 3 and oriented in diametrically opposite directions.
  • the closure devices 33 and 34 are superimposed relative to the axis of the intake duct 7.
  • the operational safety of the obturation device is reinforced, since it suffices that one of the two obturation devices operates to ensure a continuous supply of fluid to the pump.
  • the shutter device 33 comprises a shutter 35 having a conical bearing surface 36 which cooperates with a conical seat 37 secured to the intake duct at its lower end.
  • the shutter 35 is guided by a cylindrical rod 38 which cooperates with a cylindrical housing 39 also carried by the intake duct 7.
  • Return means 40 such as a helical spring surrounding the rod 38, applies the shutter 35 to its seat 37.
  • the orientation of the conical surfaces of the shutter 35 and of the seat 37 is such that the shutter device prevents the flow of a fluid coming from inside the intake duct 7 and going towards the annular space 41 defined by the walls of the well and the external surface of the intake duct 7.
  • the gas / liquid mixture rises in the well and meets the closure device which keeps the ball in blocking of the opening 23.
  • the mixture progresses laterally around the intake duct 7 to the separation duct 8.
  • the assembly pumping device has been lowered into the well, so that the dynamic level of the mixture (represented by line A in FIG. 1) is substantially above the separation pipe.
  • the orifices regularly arranged around the duct of separation 8 allow the introduction of the fluid into the intake duct.
  • a degassing phenomenon occurs at the level of the mixing surface; the gas escaping to the surface through the well and the fluid falling back into the intake duct.
  • This pressure difference implies a force against the ball which moves away from its seat and allows the entry of the fluid / gas mixture directly through the lower end of the assembly.
  • the pump is therefore constantly supplied with fluid. It then only remains to operate on the operating conduits, or reduce the speed of rotation and therefore the flow rate of the pump to promote an increase in the dynamic level at the height of the separation conduit 8.
  • the pressures balance then between the outside and the inside of the intake duct 7, the ball comes to rest on its seat to block the opening and the separation phenomenon can again take place.
  • This pressure balancing process is also carried out when the assembly is initially lowered and the intake duct 7 is empty of any fluid. In this state the pump is not yet running and when pressure balancing is completed, the pump is commissioned.
  • This pressure difference implies a force against the shutter 35, which moves away from its seat 37 and allows the entry of the fluid / gas mixture directly through the lower end of the assembly.
  • the pump is therefore constantly supplied with fluid.
  • the intake duct 7 has a length L of practically 60 meters and the intermediate production tube 6 has a length of 45 approximately meters, the pump and a fluid reservoir then having a length 1 of 15 meters.
  • the separation conduit 8 has a length of 1 meter.
  • the length of the intake duct 7 can be adapted in the case of a different well orientation, so as to constantly achieve a pressure difference of a few bars between the intake level of the pump 3 and the level of the orifices. 9 of the separation duct.
  • the present invention is particularly applicable in the case of highly deviated wells which can approach substantially the horizontal. However, it finds the same applications in the case of vertical wells.

Claims (8)

  1. Vorrichtung zur Trennung eines Gemisches aus freiem Gas und Flüssigkeit zur Beaufschlagung einer Pumpe (3), die mit einem unteren Ende einer röhrenförmigen Kolonne (2) am Boden eines gebohrten Bohrloches verbunden ist, wobei die Pumpe (3) mit der röhrenförmigen Kolonne (2) über ein Produktionszwischenrohr (6) verbunden ist und in eine Fluideinlaßvorrichtung (7, 8) eingeführt ist, von dem ein unteres Ende verschlossen ist, wobei das untere Ende wenigstens ein Ventil und ein oberes Ende Öffnungen (9) zum Einführen von Fluid aufweist, und die Pumpe im Inneren der Einlaßvorrichtung benachbart ihrem unteren Ende angeordnet ist, dadurch gekennzeichnet, daß diese Einlaßvorrichtung ein zylindrisches Rohr umfaßt und daß diese wenigstens ein Ventil (21, 22) bildende Vorrichtung auf den zylindrischen Wandungen dieser Einlaßvorrichtung angeordnet ist.
  2. Trennvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß diese Einlaßvorrichtung eine Einlaßleitung (7) umfaßt, welche koaxial das Produktionszwischenrohr (6) und die Pumpe (3) umschließt, wobei die Einlaßleitung verlängert über eine Trennleitung (8) ist, die über den Umfang mit Öffnungen (9) versehen und um diese röhrenförmige Kolonne (2) durch ein Befestigungsstück (16) gehalten ist.
  3. Trennvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das Produktionszwischenrohr (16) und die Pumpe (3) koaxial zur Einlaßleitung über Zentrierstücke (10) gehalten sind.
  4. Trennvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die wenigstens ein Ventil bildende Vorrichtung ein Verschlußglied, beispielsweise eine Kugel oder eine Klappe (21) umfaßt, die konstant durch elastische Mittel (22) zum Blockieren einer Einführungsöffnung (23) von Fluid in die Einlaßleitung beaufschlagt ist.
  5. Trennvorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß die elastischen Mittel (22) einen Kompressionswiderstand bei Minimumdruck umfassen, wobei der Minimumdruck einem Flüssigkeitsniveau in der Einlaßleitung oberhalb der Pumpe entspricht.
  6. Trennvorrichtung nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß die Einlaßleitung (7) und die Trennleitung (8) in dem gebohrten Loch durch Stabilisatoren (11) gehalten sind.
  7. Trennvorrichtung nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß die Länge der Einlaßvorrichtung (7, 8) des Fluids derart gewählt wird, daß eine Druckdifferenz von etlichen bar zwischen dem Einlaßniveau der Pumpe (3) und dem Niveau der Einführungsöffnungen (9) des Fluids in diese Vorrichtung entwickelt wird.
  8. Pumpinstallation in einem Bohrloch mit einer Trennvorrichtung nach einem beliebigen der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß dieses Bohrloch eine untere Zone umfaßt, deren Orientierung von der Vertikalen bis zu einer starken Neigung variiert.
EP90403476A 1989-12-28 1990-12-06 Vorrichtung zur Separation eines Gas-Flüssigkeitsgemisches als Zufuhr einer Imbohrlochpumpe Expired - Lifetime EP0435716B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917520A FR2656652B1 (fr) 1989-12-28 1989-12-28 Dispositif de separation d'un melange de gaz libre et de liquide a l'admission d'une pompe au fond d'un puits fore.
FR8917520 1989-12-28

Publications (2)

Publication Number Publication Date
EP0435716A1 EP0435716A1 (de) 1991-07-03
EP0435716B1 true EP0435716B1 (de) 1994-10-05

Family

ID=9389198

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90403476A Expired - Lifetime EP0435716B1 (de) 1989-12-28 1990-12-06 Vorrichtung zur Separation eines Gas-Flüssigkeitsgemisches als Zufuhr einer Imbohrlochpumpe

Country Status (6)

Country Link
US (1) US5113937A (de)
EP (1) EP0435716B1 (de)
CA (1) CA2033367A1 (de)
DK (1) DK0435716T3 (de)
FR (1) FR2656652B1 (de)
NO (1) NO301848B1 (de)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2692320B1 (fr) * 1992-06-12 1995-11-24 Inst Francais Du Petrole Dispositif et methode de pompage d'un liquide visqueux comportant l'injection d'un produit fluidifiant, application aux puits horizontaux.
FR2714120B1 (fr) * 1993-12-16 1996-03-15 Inst Francais Du Petrole Systeme de pompage comportant une pompe volumetrique a grand debit
CA2120283C (en) * 1994-03-30 2004-05-18 Bernard Heinrichs Down-hole gas separator
FR2727475B1 (fr) * 1994-11-25 1997-01-24 Inst Francais Du Petrole Methode et systeme de pompage comportant une pompe volumetrique entrainee par un tube continu - application aux puits devies
FR2741382B1 (fr) * 1995-11-21 1997-12-26 Inst Francais Du Petrole Methode et dispositif de production par pompage dans un drain horizontal
US6257333B1 (en) * 1999-12-02 2001-07-10 Camco International, Inc. Reverse flow gas separator for progressing cavity submergible pumping systems
US6715556B2 (en) * 2001-10-30 2004-04-06 Baker Hughes Incorporated Gas restrictor for horizontally oriented well pump
US6705402B2 (en) 2002-04-17 2004-03-16 Baker Hughes Incorporated Gas separating intake for progressing cavity pumps
US7628209B2 (en) * 2006-03-08 2009-12-08 Baker Hughes Incorporated Tubing driven progressing cavity pump and method of pumping well fluid from a well
US7971649B2 (en) 2007-08-03 2011-07-05 Pine Tree Gas, Llc Flow control system having an isolation device for preventing gas interference during downhole liquid removal operations
CA2717366A1 (en) 2008-03-13 2009-09-17 Pine Tree Gas, Llc Improved gas lift system
US7798211B2 (en) * 2008-05-22 2010-09-21 Baker Hughes Incorporated Passive gas separator for progressing cavity pumps
WO2011073203A1 (en) * 2009-12-14 2011-06-23 Shell Internationale Research Maatschappij B.V. Separating multiphase effluents of an underwater well
US8960273B2 (en) * 2011-10-27 2015-02-24 Oilfield Equipment Development Center Limited Artificial lift system for well production
CN106150465B (zh) * 2015-04-28 2018-12-11 中国石油化工股份有限公司 蒸汽驱油井井下注剂注入方法及装置
US10260330B2 (en) 2015-04-29 2019-04-16 General Electric Company Fluid intake for an artificial lift system and method of operating such system

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US1573051A (en) * 1925-06-17 1926-02-16 Shell Company Of California Gas anchor for pumping wells
US2267459A (en) * 1939-01-09 1941-12-23 Fmc Corp Deep well pump
US2810352A (en) * 1956-01-16 1957-10-22 Eugene D Tumlison Oil and gas separator for wells
US2969742A (en) * 1958-07-18 1961-01-31 Reda Pump Company Gas separator for submergible motorpump assemblies
US3128719A (en) * 1960-06-13 1964-04-14 Shell Oil Co Gas anchor
US4386654A (en) * 1981-05-11 1983-06-07 Becker John A Hydraulically operated downhole oil well pump
US4592427A (en) * 1984-06-19 1986-06-03 Hughes Tool Company Through tubing progressing cavity pump
US4664603A (en) * 1984-07-31 1987-05-12 Double R Petroleum Recovery, Inc. Petroleum recovery jet pump pumping system
US4762176A (en) * 1987-03-23 1988-08-09 Miller Orand C Air-water separator
FR2631379A1 (fr) * 1988-05-11 1989-11-17 Inst Francais Du Petrole Dispositif de pompage d'un fluide au fond d'un puits fore notamment a zone basse fortement inclinee ou horizontale

Also Published As

Publication number Publication date
FR2656652B1 (fr) 1995-08-25
FR2656652A1 (fr) 1991-07-05
NO905570D0 (no) 1990-12-21
EP0435716A1 (de) 1991-07-03
US5113937A (en) 1992-05-19
CA2033367A1 (fr) 1991-06-29
NO301848B1 (no) 1997-12-15
NO905570L (no) 1991-07-01
DK0435716T3 (da) 1995-03-27

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