EP0910724B1 - Systeme de separateur cyclone en condition de fond - Google Patents

Systeme de separateur cyclone en condition de fond Download PDF

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Publication number
EP0910724B1
EP0910724B1 EP97932768A EP97932768A EP0910724B1 EP 0910724 B1 EP0910724 B1 EP 0910724B1 EP 97932768 A EP97932768 A EP 97932768A EP 97932768 A EP97932768 A EP 97932768A EP 0910724 B1 EP0910724 B1 EP 0910724B1
Authority
EP
European Patent Office
Prior art keywords
hydrocyclone
downhole
pump
overflow
water
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
EP97932768A
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German (de)
English (en)
Other versions
EP0910724A1 (fr
Inventor
Frank Skilbeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baker Hughes Ltd
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Baker Hughes Ltd
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Filing date
Publication date
Application filed by Baker Hughes Ltd filed Critical Baker Hughes Ltd
Publication of EP0910724A1 publication Critical patent/EP0910724A1/fr
Application granted granted Critical
Publication of EP0910724B1 publication Critical patent/EP0910724B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E21B43/385—Arrangements for separating materials produced by the well in the well by reinjecting the separated materials into an earth formation in the same well

Definitions

  • An increasingly important technique in producing oil from high cut water wells involves carrying out a pre-separation of the oil and water down hole, pumping the oil component to the surface and injecting the water component back into the well.
  • the oil component which is pumped to the surface is still very wet and there is a need to reduce the water content of the oil component further.
  • It is possible to separate the fluid to produce a much drier oil component for pumping to the surface by utilizing as the pre-separator a hydrocyclone which is appropriately set up by the choice of overflow and underflow orifices sizes and working pressures, but only if a significant proportion of oil is accepted in the water component leaving the underflow of the hydrocyclone.
  • This method enables the amount of water which is pumped to the surface to be reduced whilst maintaining substantially clean water for reinjection into the production zone.
  • Two pumps are needed, one to pump the production fluid into the inlet of the first hydrocyclone, this pumping being necessary to ensure that the substantially clean water component leaving the underflow of the second hydrocylone is at a higher pressure than that of the production fluid.
  • the other pump is necessary for pumping the substantially dry oil component to the surface.
  • the invention also includes an apparatus for use downhole in an oil well, the apparatus comprising first and second hydrocyclone, the underflow of the first hydrocyclone being connected to the inlet of the second hydrocyclone; a first pump for pumping production fluid into the inlet of the first hydrocyclone; and a second pump for pumping liquid form the overflow of the first hydrocyclone, in use to the surface; the overflow of the second hydrocyclone being connected to the inlet of the first pump, or to the inlet of the second party, and the underflow outlet of the second hydrocylone being arranged to discharge, in use, into the well.
  • the apparatus A is mounted within a conventional well bore 3, having production perforations 4 and injection perforations 5 separated by a packer 6.
  • production fluid flows through the perforations 4 into the well bore and is them pumped by an injection pump 7 into the inlet of a first hydrocyclone 8.
  • the substantially dry oil component leaves the overflow of the hydrocyclone 8 through a line 9 which leads to the inlet of a production pump 10 which pumps the oil component through a line 11 to the surface.
  • the underflow of the hydrocyclone 8 is connected to the inlet of a second hydrocyclone 12, the overflow of which is either is fed through a conduit indicated by the arrow 13 to the inlet of the injection pump 7, and hence is recycled through the first hydrocyclone 8.
  • the substantially clean water leaving the underflow of the hydrocyclone 12 is discharged below the packer 6, as indicated by the arrows 15, and hence through the injection perforations 5 back into the production zone.
  • Both pumps 7 and 11 are driven by a common motor 16 separated from the motors by conventional protectors 17 and 18.
  • the following oil/water ratios may be helpful.
  • the pump 7 will pump 21 parts oil and 84 parts water into the inlet of the first hydrocyclone 8.
  • acceptably dry oil component leaving the overflow of the first hydrocyclone 8 might then contain 20 parts oil and four parts water, the remaining one part oil and 80 parts water leaving the underflow of the hydrocylone 8 and entering the inlet of the second hydrocyclone 12. Allowing for the continued recycling of one part oil and four parts water from the overflow of the second hydrocyclone 12, this leaves 76 parts water to leave the underflow of the second hydrocyclone 12 for reinjection into the well.

Claims (5)

  1. Procédé de séparation des mélanges de pétrole et d'eau d'un fluide de production d'un gisement pétrolifère en fond de trou dans un trou de forage de puits (3) en une composante pétrolifère substantiellement sèche destinée à être délivrée à la surface et une composante aqueuse substantiellement propre destinée à être réinjectée en fond de trou, ce procédé utilisant une séparation par hydrocyclones en fond de trou au sein du trou de forage de puits (3), le procédé comprenant les étapes consistant à :
    prévoir un premier hydrocyclone (8) conçu pour produire un sur-écoulement de composante pétrolifère à partir du fluide de production, ayant une première pompe (7) à son entrée et une deuxième pompe (10) au niveau de son sur-écoulement, de façon à délivrer la composante pétrolifère à la surface;
    prévoir un deuxième hydrocyclone (12) disposé en série, du point de vue de l'écoulement, par rapport au premier hydrocyclone (8), recevant le sous-écoulement du premier hydrocyclone (8) et conçu pour produire un sous-écoulement de composante aqueuse; et
    réinjecter le sous-écoulement du deuxième hydrocyclone (12) en tant que composante aqueuse en fond de trou dans le trou de forage du puits;
       l'amélioration comprenant les étapes consistant à :
    mettre en oeuvre le premier hydrocyclone (8) de façon à produire un sur-écoulement de composante pétrolifère substantiellement sèche, mais avec un sous-écoulement d'eau sale;
    mettre en oeuvre le deuxième hydrocyclone (12) de façon à produire un sous-écoulement d'eau propre, mais avec un sur-écoulement d'eau sale; et
    envoyer le sur-écoulement d'eau sale du deuxième hydrocyclone (12) à l'entrée de la première pompe (7) pour créer un écoulement sous pression du sur-écoulement d'eau sale à l'entrée du premier hydrocyclone, afin d'obtenir un meilleur degré de séparation du fluide de production de gisement pétrolifère en une composante pétrolifère sèche destinée à être délivrée à la surface et une composante aqueuse propre destinée à être réinjectée en fond de trou, tout ceci s'effectuant au sein du trou de forage de puits (3).
  2. Procédé selon la revendication 1, dans lequel la première pompe (7) et la deuxième pompe (10) sont entraínées toutes les deux à l'aide d'un moteur commun (16) positionné en fond de trou.
  3. Dispositif en fond de trou de séparation des mélanges de pétrole et d'eau d'un fluide de production en une composante pétrolifère substantiellement sèche destinée à être délivrée à la surface et une composante aqueuse substantiellement propre destinée à être réinjectée en fond de trou, ce dispositif utilisant une séparation par hydrocyclones en fond de trou au sein du trou de forage de puits (3), le dispositif comprenant :
    un premier hydrocyclone (8) destiné à séparer une composante pétrolifère du fluide de production devant être délivrée à la surface;
    une première pompe (7) à l'entrée du premier hydrocyclone (8) et une deuxième pompe (10) au niveau de son sous-écoulement de façon à délivrer la composante pétrolifère sèche à la surface ; et
    un deuxième hydrocyclone (12) disposé en aval du premier hydrocyclone (8), recevant le sous-écoulement du premier hydrocyclone (8) et séparant le sous-écoulement en une composante aqueuse destinée à être réinjectée en fond de trou;
       l'amélioration étant telle que :
    le premier hydrocyclone (8) est conçu de façon à produire un sur-écoulement de composante pétrolifère substantiellement sèche, mais avec un sous-écoulement d'eau sale;
    le deuxième hydrocyclone (12) est conçu de façon à produire un sous-écoulement d'eau propre, mais avec un sur-écoulement d'eau sale; et
    le dispositif comprend en outre une connexion d'écoulement de fluide pour recycler le sur-écoulement d'eau sale du deuxième hydrocyclone (12) à l'entrée de la première pompe (7) afin de créer un écoulement sous pression du sur-écoulement d'eau sale à l'entrée du premier hydrocyclone (8), afin d'obtenir un meilleur degré de séparation du fluide de production de gisement pétrolifère en une composante pétrolifère sèche destinée à être délivrée à la surface et une composante aqueuse propre destinée à être réinjectée en fond de trou, tout ceci s'effectuant au sein du trou de forage de puits (3).
  4. Dispositif selon la revendication 3, comprenant en outre un seul moteur (16) entraínant tant la première pompe (7) que la deuxième pompe (10).
  5. Dispositif selon la revendication 4, dans lequel le moteur (16), les pompes (7, 10) et les hydrocyclones (8, 12) sont rassemblés dans un train de tiges en fond de trou.
EP97932768A 1996-07-12 1997-07-02 Systeme de separateur cyclone en condition de fond Expired - Lifetime EP0910724B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB9614675.8A GB9614675D0 (en) 1996-07-12 1996-07-12 Oil well production
GB9614675 1996-07-12
PCT/EP1997/003445 WO1998002637A1 (fr) 1996-07-12 1997-07-02 Systeme de separateur cyclone en condition de fond

Publications (2)

Publication Number Publication Date
EP0910724A1 EP0910724A1 (fr) 1999-04-28
EP0910724B1 true EP0910724B1 (fr) 2001-10-31

Family

ID=10796804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97932768A Expired - Lifetime EP0910724B1 (fr) 1996-07-12 1997-07-02 Systeme de separateur cyclone en condition de fond

Country Status (7)

Country Link
EP (1) EP0910724B1 (fr)
AT (1) ATE208005T1 (fr)
AU (1) AU3620097A (fr)
DE (1) DE69707880D1 (fr)
GB (1) GB9614675D0 (fr)
NO (1) NO990125L (fr)
WO (1) WO1998002637A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002002908A1 (fr) 2000-07-06 2002-01-10 Shell Internationale Research Maatschappij B.V. Appareil et procede permettant la separation de fluides de puits
NO312978B1 (no) * 2000-10-20 2002-07-22 Kvaerner Oilfield Prod As Fremgangsmåter og anlegg for å produsere reservoarfluid
US7621339B2 (en) 2007-02-14 2009-11-24 Schlumberger Technology Corporation Downhole production and injection pump system
CN103742124A (zh) * 2013-12-28 2014-04-23 中国石油天然气股份有限公司 对井下油水分离同井注采井的采出液再分离方法
WO2015112394A1 (fr) 2014-01-22 2015-07-30 Saudi Arabian Oil Company Système de séparation pétrole/eau de fonds de puits destiné à améliorer l'injectivité et la récupération du réservoir

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MX167588B (es) * 1984-11-28 1993-03-31 Conoco Specialty Prod Aparato para procesar petroleo
US5302294A (en) * 1991-05-02 1994-04-12 Conoco Specialty Products, Inc. Separation system employing degassing separators and hydroglyclones
US5456837A (en) * 1994-04-13 1995-10-10 Centre For Frontier Engineering Research Institute Multiple cyclone apparatus for downhole cyclone oil/water separation

Also Published As

Publication number Publication date
ATE208005T1 (de) 2001-11-15
EP0910724A1 (fr) 1999-04-28
NO990125L (no) 1999-03-12
GB9614675D0 (en) 1996-09-04
AU3620097A (en) 1998-02-09
NO990125D0 (no) 1999-01-12
DE69707880D1 (de) 2001-12-06
WO1998002637A1 (fr) 1998-01-22

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