EP0694676A1 - Installation for oil well - Google Patents

Installation for oil well Download PDF

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Publication number
EP0694676A1
EP0694676A1 EP95401776A EP95401776A EP0694676A1 EP 0694676 A1 EP0694676 A1 EP 0694676A1 EP 95401776 A EP95401776 A EP 95401776A EP 95401776 A EP95401776 A EP 95401776A EP 0694676 A1 EP0694676 A1 EP 0694676A1
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EP
European Patent Office
Prior art keywords
well
casing
hydrocarbons
installation
chamber
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Granted
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EP95401776A
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German (de)
French (fr)
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EP0694676B1 (en
Inventor
Jean-Louis Beauquin
Pierre Lemetayer
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Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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Societe National Elf Aquitaine
Societe Nationale Elf Aquitaine Production SA
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Publication of EP0694676A1 publication Critical patent/EP0694676A1/en
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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
    • E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
    • 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

Definitions

  • the present invention relates to an installation for an oil well and more particularly, but not exclusively, to an installation for an activated oil well, a well in which the flow of hydrocarbons from the bottom to the surface is assisted, temporarily or continuously by an activation means, for example a pump, the outlet of which is disposed at the bottom of the well.
  • an activation means for example a pump
  • an assistance system or well activation system can be used.
  • a pump at the lower end of a production tube located in the well. This pump, fitted with an electric motor immersed at the bottom of the well and supplied by a cable arranged in the annular space between the casing and the casing of the well, sends hydrocarbons under pressure from the bottom to the surface.
  • the power cable of the electric motor as well as the connections at each of its ends, extend in an aggressive environment, and often hot and corrosive, and are subjected to strong variations in gas pressure and thus undergo rapid deterioration. . Replacing this electrical equipment is an expensive operation which also implies production losses during the shutdown of the well.
  • the present invention relates to an installation for an oil well offering increased flexibility in controlling the flow of hydrocarbons and which makes it possible to define, in the well, a chamber isolated from the hydrocarbons coming from the bottom of the well.
  • the invention provides an installation for an oil well extending from the surface to a layer of petroleum rock, comprising a first casing disposed in the well and forming a flow path towards the surface for the hydrocarbons coming from the layer of petroleum rock characterized in that it comprises a second casing disposed in the well and forming a second flow path towards the surface, for the hydrocarbons coming from the same layer of rock, the installation further comprising a chamber between the casings and the wall of the well, which does not contain hydrocarbons from the rock layer.
  • the second casing is provided with an electric pump, the supply cable of which largely extends in the chamber.
  • an oil well 10 extends between the surface 12 and a layer of petroleum rock 14.
  • the well is provided with perforations 16 opening in the petroleum rock which allow the flow of hydrocarbons towards the inside the well 10.
  • the well 10 has a casing 18 which makes the well tight with respect to the layers of rock through which the well passes.
  • the first casing 20 which extends between a well head, shown diagrammatically at 24, and a seal 26, more commonly known as a "packer", disposed, for example, about 100 m above the level of the oil rock 14
  • the first casing 20 is optionally provided with a safety valve 28 towards its upper end, for example 50 m from the ground.
  • the second casing 22, also supported by the well head and optionally provided with a safety valve 29, extends parallel to the first casing 20 and immediately adjacent to the latter.
  • the diameter of the second casing 22 is preferably less than that of the first casing 20.
  • the second casing 22 comprises a pumping assembly, generally represented at 30, which comprises a pump 32 rotated by an electric motor 34.
  • the electric motor 34 is supplied by an electric cable 36 disposed outside casings 20, 22.
  • the cable 36 extends in the vicinity of the two casings 20, 22, as shown in FIG. 1B, thus sheltered from mechanical shocks which can occur during well repair operations. .
  • the electric motor is surrounded by a jacket 38 provided with a tubular extension 40 which extends to a level below the perforations 16.
  • the function of the pump is to suck up the heaviest hydrocarbons, the lightest tending to rise naturally through the casing 20.
  • the two casings 20 and 22 are secured by seals 46.
  • a first fraction of the hydrocarbons passes through the first casing 20 which, having a large diameter, promotes the natural flow of the hydrocarbons with friction minimum.
  • This path has a downward flow section which favors the gravity elimination of the free gas present in the liquid, by difference in phase density.
  • the passage of liquid hydrocarbons around the engine 34 before reaching the pump 32 ensures the cooling of the engine.
  • conduits 20 'and 22' are connected by a conduit 48 which opens into a venturi 50 disposed in the conduit 22 'and whose function is to enhance the suction of light hydrocarbons in the conduit 22'.
  • the conduit 48 is provided with a non-return valve 52.
  • the venturi 50 is adjustable.
  • This assembly can also be installed in the well, before the bifurcation, at a depth determined as a function of optimal hydraulic conditions and in particular under the seal 26 if it is desired to save a double well head and casing in the upper part. In this case, this assembly can be put in place or replaced by a light intervention, for example using a cable.
  • the flow of the second fraction in the conduit 22 'through the venturi 50 creates a vacuum which reinforces the suction of the first fraction flowing in the conduit 20'. For this reason on the one hand, and because it reduces the pressure at the bottom of the well, pumping, or other method of flow of the second fraction in the conduit 22 ', serves to increase the flow capacity of the first fraction in the conduit 20'.
  • pumping or other method of flow of the second fraction in the conduit 22 ', serves to increase the flow capacity of the first fraction in the conduit 20'.
  • it is possible to control the flow rate in the first conduit for example by varying the flow rate in the casing 22.
  • the volume outside the casings 20, 22 in the casing 18 between the seal 26 and the well head 24 constitutes a chamber 51 which is filled with a chemically inert product which, in a preferred embodiment is a good thermal insulating gel, intended to reduce thermal convection in the chamber 51.
  • a chemically inert product which, in a preferred embodiment is a good thermal insulating gel, intended to reduce thermal convection in the chamber 51.
  • the electric cable 36 and the hydraulic lines (not shown) leading to the safety valves 28, 29 extend in a non-corrosive environment, which considerably prolongs their service life. Only the last section of the electric cable, extending between the seal 26 and the motor 34, is in a corrosive environment. Given its short length, this section can be protected by more expensive protective means, for example by placing it in a reinforced or armored metal sheath.
  • the casings 20 and 22 are connected to each other upstream of the safety valves 28, 29 at one or more points by hydraulic conduits, shown diagrammatically at 54, provided with a control valve (not shown) which can be interchanged with the cable from the surface.
  • hydraulic conduits shown diagrammatically at 54, provided with a control valve (not shown) which can be interchanged with the cable from the surface.
  • These hydraulic conduits can advantageously be incorporated in a seal 46 mechanically joining the two casings.
  • the installation in the well 10 of the two casings 20 and 22 also offers the possibility of assisting the flow of the hydrocarbons by injection of gas towards the bottom of the well in order to lighten the column of hydrocarbons.
  • this gas injection more commonly known as a "gas lift”
  • this gas injection is carried out through the casing 22 of smaller diameter in order to cause the hydrocarbons to flow through the casing 20 of larger diameter. It is also possible to inject gas from the casing 20 to the casing 22 in order to relieve the pump in operation.
  • the installation according to the invention allows numerous punctual operations simultaneous with pumping, by accessing the bottom of the well using apparatus hung on the cable such as measurements of bottom parameters, for example, flow rate, temperature or pressures. .
  • the installation also makes it possible to make perforations while depressurizing the bottom of the well with the pump, which has the advantage of promoting the evacuation of shooting debris and therefore improving the permeability of the holes thus made in the casing.
  • the perforation barrel is lowered to the cable by the second casing.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Jet Pumps And Other Pumps (AREA)
  • Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)

Abstract

The installation, for use in a well (10) extending from the surface to an oil-bearing rock layer (14), consists of a first tube (20) and a second tube (22) for carrying hydrocarbons from the rock layer to the surface, and a chamber (51) between the two tubes and the well wall (18) which contains no hydrocarbons. The second tube (22) is also equipped with an electric pump (32, 34) with its feed cable (36) located mainly in the chamber (51). The chamber (51) is filled with an inert substance such as a gel with a high level of thermal insulation, and the two tubes are connected at a point (48) on the surface (12) or inside the well. The connection is in the form of a duct from the first tube which joins the second tube inside a Venturi unit (50). <IMAGE>

Description

La présente invention se rapporte à une installation pour un puits pétrolier et plus particulièrement, mais pas exclusivement, à une installation pour un puits pétrolier activé, puits dans lequel l'écoulement des hydrocarbures du fond à la surface est assisté, temporairement ou en continu par un moyen d'activation, par exemple une pompe dont la sortie est disposée au fond du puits.The present invention relates to an installation for an oil well and more particularly, but not exclusively, to an installation for an activated oil well, a well in which the flow of hydrocarbons from the bottom to the surface is assisted, temporarily or continuously by an activation means, for example a pump, the outlet of which is disposed at the bottom of the well.

Dans certains puits pétroliers, l'écoulement naturel des hydrocarbures du fond à la surface s'avère insuffisant pour permettre ou maintenir une production commerciale. Ceci est dû soit à la viscosité importante des hydrocarbures, soit à une trop faible pression naturelle au fond du puits ou encore à une combinaison des deux. Afin de permettre la mise en production du puits à une échelle commerciale, on peut utiliser un système d'assistance ou système d'activation du puits. Par exemple, on peut disposer une pompe à l'extrémité inférieure d'un tube de production situé dans le puits. Cette pompe, munie d'un moteur électrique immergé au fond du puits et alimenté par un câble disposé dans l'espace annulaire entre le tubage et le cuvelage du puits, envoie des hydrocarbures sous pression du fond à la surface. Le câble d'alimentation du moteur électrique, ainsi que les connections à chacune de ses extrémités, s'étendent dans un milieu agressif, et souvent chaud et corrosif, et sont soumis à de fortes variations de pression de gaz et subissent ainsi une détérioration rapide. Le remplacement de ces équipements électriques est une opération coûteuse qui implique, de plus, des pertes de production pendant l'arrêt de fonctionnement du puits.In some oil wells, the natural flow of hydrocarbons from the bottom to the surface is insufficient to allow or maintain commercial production. This is due either to the high viscosity of the hydrocarbons, or to a too low natural pressure at the bottom of the well or to a combination of the two. In order to allow the well to be put into production on a commercial scale, an assistance system or well activation system can be used. For example, there may be a pump at the lower end of a production tube located in the well. This pump, fitted with an electric motor immersed at the bottom of the well and supplied by a cable arranged in the annular space between the casing and the casing of the well, sends hydrocarbons under pressure from the bottom to the surface. The power cable of the electric motor, as well as the connections at each of its ends, extend in an aggressive environment, and often hot and corrosive, and are subjected to strong variations in gas pressure and thus undergo rapid deterioration. . Replacing this electrical equipment is an expensive operation which also implies production losses during the shutdown of the well.

L'utilisation d'un moteur électrique en fond de puits présente d'autres inconvénients au niveau du câble d'alimentation car il nécessite une étanchéité performante au point où le câble pénètre dans une partie du puits en contact avec les effluents émanant de la roche pétrolifère, ou traverse l'ensemble de tête de puits disposé à la surface. Cette étanchéité, difficile à réaliser, est souvent la cause de courts-circuits détériorant l'installation et la rendant inopérante.The use of an electric motor at the bottom of a well has other disadvantages in terms of the supply cable because it requires an effective seal at the point where the cable enters a part of the well in contact with the effluents emanating from the rock. petroleum, or passes through the wellhead assembly disposed at the surface. This tightness, difficult to achieve, is often the cause of short circuits damaging the installation and rendering it inoperative.

De plus, dans ce type d'installation, dans lequel un seul tubage est mis en place, le fonctionnement est souvent handicapé par la présence de gaz que l'on peut être amené à séparer des liquides et acheminer par l'espace annulaire.In addition, in this type of installation, in which a single casing is put in place, the operation is often handicapped by the presence of gas which may have to be separated from liquids and conveyed through the annular space.

La présente invention a pour objet une installation pour puits pétrolier offrant une flexibilité accrue du contrôle de l'écoulement des hydrocarbures et qui permet de définir, dans le puits, une chambre isolée des hydrocarbures en provenance du fond de puits.The present invention relates to an installation for an oil well offering increased flexibility in controlling the flow of hydrocarbons and which makes it possible to define, in the well, a chamber isolated from the hydrocarbons coming from the bottom of the well.

Pour ce faire, l'invention propose une installation pour puits pétrolier s'étendant de la surface vers une couche de roche pétrolifère, comprenant un premier tubage disposé dans le puits et formant une voie d'écoulement vers la surface pour les hydrocarbures provenant de la couche de roche pétrolifère caractérisé en ce qu'elle comprend un second tubage disposé dans le puits et formant une seconde voie d'écoulement vers la surface, pour les hydrocarbures provenant de la même couche de roche, l'installation comprenant de plus une chambre entre les tubages et la paroi du puits, qui ne contient pas d'hydrocarbures en provenance de la couche de roche.To do this, the invention provides an installation for an oil well extending from the surface to a layer of petroleum rock, comprising a first casing disposed in the well and forming a flow path towards the surface for the hydrocarbons coming from the layer of petroleum rock characterized in that it comprises a second casing disposed in the well and forming a second flow path towards the surface, for the hydrocarbons coming from the same layer of rock, the installation further comprising a chamber between the casings and the wall of the well, which does not contain hydrocarbons from the rock layer.

Selon un deuxième aspect de l'invention, le second tubage est muni d'une pompe électrique dont le câble d'alimentation en grande partie s'étend dans la chambre.According to a second aspect of the invention, the second casing is provided with an electric pump, the supply cable of which largely extends in the chamber.

D'autres caractéristiques et avantages de la présente invention ressortiront plus clairement à la lecture de la description ci-après faite en référence aux dessins annexés sur lesquels :

  • la figure 1A est une vue schématique en coupe d'un puits pétrolier activé selon l'invention ; et
  • la figure 1B est une section prise selon la ligne 1B-1B de la figure 1A.
Other characteristics and advantages of the present invention will emerge more clearly on reading the description below made with reference to the appended drawings in which:
  • FIG. 1A is a schematic sectional view of an activated oil well according to the invention; and
  • Figure 1B is a section taken along line 1B-1B of Figure 1A.

Comme représenté sur la figure 1, un puits pétrolier 10 s'étend entre la surface 12 et une couche de roche pétrolifère 14. Le puits est muni de perforations 16 s'ouvrant dans la roche pétrolifère qui permettent l'écoulement des hydrocarbures vers l'intérieur du puits 10. Le puits 10 comporte un cuvelage 18 qui rend le puits étanche par rapport aux couches de roches traversées par le puits.As shown in FIG. 1, an oil well 10 extends between the surface 12 and a layer of petroleum rock 14. The well is provided with perforations 16 opening in the petroleum rock which allow the flow of hydrocarbons towards the inside the well 10. The well 10 has a casing 18 which makes the well tight with respect to the layers of rock through which the well passes.

A l'intérieur du puits 10 s'étendent deux tubages de production 20 et 22 qui peuvent être de diamètres différents. Dans l'exemple illustré, les tubages 20 et 22 s'étendent de façon parallèle, mais les tubages peuvent être disposés de manière concentrique, l'un dans l'autre. Le premier tubage 20 qui s'étend entre une tête de puits, représentée schématiquement en 24, et un joint 26, plus communément appelé "packer", disposé, par exemple, à environ 100 m au-dessus du niveau de la roche pétrolifère 14. Le premier tubage 20 est éventuellement muni d'une vanne de sécurité 28 vers son extrémité supérieure, par exemple à 50 m du sol. Le deuxième tubage 22, également soutenu par la tête de puits et muni éventuellement d'une vanne de sécurité 29, s'étend parallèle au premier tubage 20 et immédiatement adjacent à ce dernier. Le diamètre du deuxième tubage 22 est préférablement inférieur à celui du premier tubage 20.Inside the well 10 extend two production casings 20 and 22 which may be of different diameters. In the example illustrated, the casings 20 and 22 extend in parallel, but the casings can be arranged concentrically, one inside the other. The first casing 20 which extends between a well head, shown diagrammatically at 24, and a seal 26, more commonly known as a "packer", disposed, for example, about 100 m above the level of the oil rock 14 The first casing 20 is optionally provided with a safety valve 28 towards its upper end, for example 50 m from the ground. The second casing 22, also supported by the well head and optionally provided with a safety valve 29, extends parallel to the first casing 20 and immediately adjacent to the latter. The diameter of the second casing 22 is preferably less than that of the first casing 20.

Vers son extrémité inférieure, le deuxième tubage 22 comporte un ensemble de pompage, représenté généralement en 30, qui comprend une pompe 32 mise en rotation par un moteur électrique 34. Le moteur électrique 34 est alimenté par un câble électrique 36 disposé à l'extérieur des tubages 20, 22. De préférence, le câble 36 s'étend au voisinage des deux tubages 20, 22, comme représenté sur la figure 1B, à l'abri ainsi de chocs mécaniques qui peuvent se produire lors des opérations de réparation du puits.Towards its lower end, the second casing 22 comprises a pumping assembly, generally represented at 30, which comprises a pump 32 rotated by an electric motor 34. The electric motor 34 is supplied by an electric cable 36 disposed outside casings 20, 22. Preferably, the cable 36 extends in the vicinity of the two casings 20, 22, as shown in FIG. 1B, thus sheltered from mechanical shocks which can occur during well repair operations. .

Dans l'exemple illustré, le moteur électrique est entouré d'une chemise 38 munie d'une prolongation tubulaire 40 qui s'étend jusqu'à un niveau en-dessous des perforations 16. La pompe a pour fonction d'aspirer les hydrocarbures les plus lourds, les plus légers tendant à remonter naturellement par le tubage 20. Les deux tubages 20 et 22 sont solidarisés par des joints 46.In the example illustrated, the electric motor is surrounded by a jacket 38 provided with a tubular extension 40 which extends to a level below the perforations 16. The function of the pump is to suck up the heaviest hydrocarbons, the lightest tending to rise naturally through the casing 20. The two casings 20 and 22 are secured by seals 46.

L'installation pour puits pétrolier ainsi décrite peut être mise en production de plusieurs façons.The oil well installation thus described can be put into production in several ways.

Dans le cas d'un puits au moins faiblement éruptif, une première fraction des hydrocarbures, légère car comportant une quantité importante de gaz, passe par le premier tubage 20 qui, ayant un diamètre important, favorise l'écoulement naturel des hydrocarbures avec une friction minimum.In the case of an at least weakly eruptive well, a first fraction of the hydrocarbons, light because it contains a large quantity of gas, passes through the first casing 20 which, having a large diameter, promotes the natural flow of the hydrocarbons with friction minimum.

Les hydrocarbures les plus lourds, provenant de la roche pétrolifère, suivent un chemin représenté par des flèches 42 vers la partie tubulaire 40, qui communique avec des entrées 44 de la pompe 32. Ce chemin comporte une section d'écoulement descendant qui favorise l'élimination gravitaire du gaz libre, présent dans le liquide, par différence de densité de phase. Le passage des hydrocarbures liquides autour du moteur 34 avant d'atteindre la pompe 32 assure le refroidissement du moteur.The heaviest hydrocarbons, coming from petroleum rock, follow a path represented by arrows 42 towards the tubular part 40, which communicates with inlets 44 of the pump 32. This path has a downward flow section which favors the gravity elimination of the free gas present in the liquid, by difference in phase density. The passage of liquid hydrocarbons around the engine 34 before reaching the pump 32 ensures the cooling of the engine.

A la surface 12, au-delà de la tête de puits 24, les tubages 20 et 22 bifurquent formant des conduits 20' et 22' respectivement. Les conduits 20' et 22' sont reliés par un conduit 48 qui débouche à l'intérieur d'un venturi 50 disposé dans le conduit 22' et dont la fonction est de renforcer l'aspiration des hydrocarbures légères dans le conduit 22'. Le conduit 48 est muni d'un clapet anti-retour 52. De préférence, le venturi 50 est réglable. Ce montage peut aussi être implanté dans le puits, avant la bifurcation, à une profondeur déterminée en fonction des conditions hydrauliques optimales et notamment sous le joint 26 si l'on souhaite économiser une tête de puits double et un tubage dans la partie supérieure. Dans ce cas, ce montage peut être mis en place ou remplacé par une intervention légère, par exemple à l'aide d'un câble.At the surface 12, beyond the well head 24, the casings 20 and 22 branch off forming conduits 20 'and 22' respectively. The conduits 20 'and 22' are connected by a conduit 48 which opens into a venturi 50 disposed in the conduit 22 'and whose function is to enhance the suction of light hydrocarbons in the conduit 22'. The conduit 48 is provided with a non-return valve 52. Preferably, the venturi 50 is adjustable. This assembly can also be installed in the well, before the bifurcation, at a depth determined as a function of optimal hydraulic conditions and in particular under the seal 26 if it is desired to save a double well head and casing in the upper part. In this case, this assembly can be put in place or replaced by a light intervention, for example using a cable.

L'écoulement de la seconde fraction dans le conduit 22' à travers le venturi 50 crée une dépression qui renforce l'aspiration de la première fraction s'écoulant dans le conduit 20'. Pour cette raison d'une part, et parce qu'il réduit la pression au fond du puits, le pompage, ou autre méthode d'écoulement de la seconde fraction dans le conduit 22', sert à augmenter la capacité d'écoulement de la première fraction dans le conduit 20'. Ainsi, il est possible de contrôler le débit d'écoulement dans le premier conduit par exemple en faisant varier le débit d'écoulement dans le tubage 22.The flow of the second fraction in the conduit 22 'through the venturi 50 creates a vacuum which reinforces the suction of the first fraction flowing in the conduit 20'. For this reason on the one hand, and because it reduces the pressure at the bottom of the well, pumping, or other method of flow of the second fraction in the conduit 22 ', serves to increase the flow capacity of the first fraction in the conduit 20'. Thus, it is possible to control the flow rate in the first conduit for example by varying the flow rate in the casing 22.

Selon un autre aspect de l'invention, le volume à l'extérieur des tubages 20,22 dans le cuvelage 18 entre le joint 26 et la tête de puits 24 constitue une chambre 51 qui est emplie d'un produit chimiquement inerte qui, dans un mode de réalisation préféré, est un gel bon isolant thermique, destiné à réduire la convection thermique dans la chambre 51. Ainsi, le câble électrique 36 et les lignes hydrauliques (non représentées) menant aux vannes de sécurité 28,29 s'étendent dans un milieu non corrosif, ce qui prolonge considérablement leur durée de vie. Seule la dernière section du câble électrique, s'étendant entre le joint 26 et le moteur 34, se trouve dans un milieu corrosif. Compte tenu de sa faible longueur, cette section peut être protégée par des moyens protecteurs plus onéreux, par exemple en le disposant dans une gaine métallique renforcée ou blindée.According to another aspect of the invention, the volume outside the casings 20, 22 in the casing 18 between the seal 26 and the well head 24 constitutes a chamber 51 which is filled with a chemically inert product which, in a preferred embodiment is a good thermal insulating gel, intended to reduce thermal convection in the chamber 51. Thus, the electric cable 36 and the hydraulic lines (not shown) leading to the safety valves 28, 29 extend in a non-corrosive environment, which considerably prolongs their service life. Only the last section of the electric cable, extending between the seal 26 and the motor 34, is in a corrosive environment. Given its short length, this section can be protected by more expensive protective means, for example by placing it in a reinforced or armored metal sheath.

Les tubages 20 et 22 sont reliés l'un à l'autre en amont des vannes de sécurité 28,29 en un ou plusieurs points par des conduits hydrauliques, représentés schématiquement en 54, muni d'une vanne de contrôle (non représentée) qui peut être interchangée au câble depuis la surface. Ces conduits hydrauliques peuvent avantageusement être incorporés dans un joint 46 solidarisant mécaniquement les deux tubages.The casings 20 and 22 are connected to each other upstream of the safety valves 28, 29 at one or more points by hydraulic conduits, shown diagrammatically at 54, provided with a control valve (not shown) which can be interchanged with the cable from the surface. These hydraulic conduits can advantageously be incorporated in a seal 46 mechanically joining the two casings.

L'installation dans le puits 10 des deux tubages 20 et 22 offre également la possibilité d'assister l'écoulement des hydrocarbures par injection de gaz vers le fond du puits afin d'alléger la colonne d'hydrocarbures. De préférence, cette injection de gaz, plus communément appelée "gas-lift", s'effectue par le tubage 22 de plus faible diamètre afin de faire écouler les hydrocarbures par le tubage 20 de diamètre plus important. Il est également possible d'injecter le gaz du tubage 20 vers le tubage 22 dans le but de soulager la pompe en fonctionnement.The installation in the well 10 of the two casings 20 and 22 also offers the possibility of assisting the flow of the hydrocarbons by injection of gas towards the bottom of the well in order to lighten the column of hydrocarbons. Preferably, this gas injection, more commonly known as a "gas lift", is carried out through the casing 22 of smaller diameter in order to cause the hydrocarbons to flow through the casing 20 of larger diameter. It is also possible to inject gas from the casing 20 to the casing 22 in order to relieve the pump in operation.

Les deux techniques peuvent être utilisées simultanément.Both techniques can be used simultaneously.

Ces deux possibilités de "gas-lift" constituent aussi d'éventuels recours, ou systèmes d'activation relais, évitant des pertes de production importante si un délai est nécessaire pour remplacer la pompe quand celle-ci est en panne, ou bien si l'effluent en provenance de la roche change de caractéristique (plus de gaz ou plus d'eau) rend inadapté la pompe en place.These two "gas-lift" possibilities also constitute possible recourse, or relay activation systems, avoiding significant production losses if it is necessary to replace the pump when it is broken, or else if the 'effluent from the rock changes in characteristic (more gas or more water) makes the pump in place unsuitable.

L'installation, selon l'invention, permet de nombreuses opérations ponctuelles simultanées au pompage, en accédant au fond du puits à l'aide d'appareils pendus au câble telles que mesures de paramètres de fond, par exemple, débit, température ou pressions.The installation according to the invention allows numerous punctual operations simultaneous with pumping, by accessing the bottom of the well using apparatus hung on the cable such as measurements of bottom parameters, for example, flow rate, temperature or pressures. .

L'installation permet également de faire des perforations tout en dépressurisant le fond de puits avec la pompe, ce qui a l'avantage de favoriser l'évacuation des débris de tirs et donc d'améliorer la perméabilité des trous ainsi effectuée dans le cuvelage. Le canon de perforation est descendu au câble par le deuxième tubage.The installation also makes it possible to make perforations while depressurizing the bottom of the well with the pump, which has the advantage of promoting the evacuation of shooting debris and therefore improving the permeability of the holes thus made in the casing. The perforation barrel is lowered to the cable by the second casing.

Claims (6)

1 - Installation pour puits pétrolier (10) s'étendant de la surface (12) vers une couche de roche pétrolifère (14), comprenant un premier tubage (20) disposé dans le puits et formant une voie d'écoulement vers la surface pour les hydrocarbures provenant de la couche de roche pétrolifère (14) caractérisé en ce qu'elle comprend un second tubage (22) disposé dans le puits et formant une seconde voie d'écoulement vers la surface, pour les hydrocarbures provenant de la même couche de roche, l'installation comprenant de plus une chambre (51) entre les tubages (20,22) et la paroi (18) du puits, qui ne contient pas d'hydrocarbures en provenance de la couche de roche. 1 - Installation for an oil well (10) extending from the surface (12) to a layer of petroleum rock (14), comprising a first casing (20) disposed in the well and forming a flow path towards the surface for the hydrocarbons coming from the layer of petroleum rock (14) characterized in that it comprises a second casing (22) disposed in the well and forming a second flow path towards the surface, for the hydrocarbons coming from the same layer of rock, the installation further comprising a chamber (51) between the casings (20,22) and the wall (18) of the well, which does not contain hydrocarbons from the layer of rock. 2 - Installation selon la revendication 1 caractérisée en ce que le second tubage (22) est muni d'une pompe électrique (32,34) dont le câble d'alimentation en grande partie s'étend dans la chambre (51). 2 - Installation according to claim 1 characterized in that the second casing (22) is provided with an electric pump (32,34), the power cable of which largely extends in the chamber (51). 3 - Installation selon la revendication 1 ou 2, caractérisée en ce que la chambre (51) est emplie d'un produit inerte. 3 - Installation according to claim 1 or 2, characterized in that the chamber (51) is filled with an inert product. 4 - Installation selon la revendication 3 caractérisée en ce que le produit inerte est un gel bon isolant thermique. 4 - Installation according to claim 3 characterized in that the inert product is a good thermal insulating gel. 5 - Installation selon l'une des revendications 1 à 4 caractérisée en ce que les tubages communiquent entre eux en un point (48) à la surface (12) ou à l'intérieur du puits. 5 - Installation according to one of claims 1 to 4 characterized in that the casings communicate with each other at a point (48) on the surface (12) or inside the well. 6 - Installation selon la revendication 5 caractérisée en ce que la communication entre les tubages s'effectuant par un conduit (48) qui débouche dans le second tubage (22) à l'intérieur d'un venturi (50) disposé dans le second tubage. 6 - Installation according to claim 5 characterized in that the communication between the casings is effected by a conduit (48) which opens into the second casing (22) inside a venturi (50) disposed in the second casing .
EP95401776A 1994-07-29 1995-07-27 Installation for oil well Expired - Lifetime EP0694676B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9409455A FR2723143B1 (en) 1994-07-29 1994-07-29 INSTALLATION FOR OIL WELL
FR9409455 1994-07-29

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EP0694676A1 true EP0694676A1 (en) 1996-01-31
EP0694676B1 EP0694676B1 (en) 1998-06-03

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US (1) US5657821A (en)
EP (1) EP0694676B1 (en)
CA (1) CA2154994C (en)
FR (1) FR2723143B1 (en)
NO (1) NO308867B1 (en)
OA (1) OA10174A (en)

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EP0866212A1 (en) * 1997-03-18 1998-09-23 Elf Exploration Production Installation for production well

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US6135210A (en) * 1998-07-16 2000-10-24 Camco International, Inc. Well completion system employing multiple fluid flow paths
US6260626B1 (en) 1999-02-24 2001-07-17 Camco International, Inc. Method and apparatus for completing an oil and gas well
US6817409B2 (en) 2001-06-13 2004-11-16 Weatherford/Lamb, Inc. Double-acting reciprocating downhole pump
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US7673676B2 (en) * 2007-04-04 2010-03-09 Schlumberger Technology Corporation Electric submersible pumping system with gas vent
US8950476B2 (en) * 2011-03-04 2015-02-10 Accessesp Uk Limited Coiled tubing deployed ESP

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Also Published As

Publication number Publication date
FR2723143A1 (en) 1996-02-02
CA2154994A1 (en) 1996-01-30
US5657821A (en) 1997-08-19
OA10174A (en) 1996-12-18
CA2154994C (en) 2005-04-12
NO953000D0 (en) 1995-07-28
FR2723143B1 (en) 1996-09-27
NO308867B1 (en) 2000-11-06
EP0694676B1 (en) 1998-06-03
NO953000L (en) 1996-01-30

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