EP3058167B1 - Hydrocarbon production plant, production process and upgrading process - Google Patents
Hydrocarbon production plant, production process and upgrading process Download PDFInfo
- Publication number
- EP3058167B1 EP3058167B1 EP14784222.3A EP14784222A EP3058167B1 EP 3058167 B1 EP3058167 B1 EP 3058167B1 EP 14784222 A EP14784222 A EP 14784222A EP 3058167 B1 EP3058167 B1 EP 3058167B1
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- Prior art keywords
- well
- production
- pump
- pressurized gas
- hydrocarbon
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- 238000004519 manufacturing process Methods 0.000 title claims description 120
- 150000002430 hydrocarbons Chemical class 0.000 title claims description 87
- 229930195733 hydrocarbon Natural products 0.000 title claims description 85
- 239000004215 Carbon black (E152) Substances 0.000 title claims description 57
- 238000000034 method Methods 0.000 title claims description 23
- 230000008569 process Effects 0.000 title description 2
- 238000002347 injection Methods 0.000 claims description 55
- 239000007924 injection Substances 0.000 claims description 55
- 230000009347 mechanical transmission Effects 0.000 claims description 7
- 230000000750 progressive effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 description 96
- 238000009434 installation Methods 0.000 description 25
- 230000014509 gene expression Effects 0.000 description 10
- 238000001816 cooling Methods 0.000 description 8
- 230000002706 hydrostatic effect Effects 0.000 description 8
- 230000004913 activation Effects 0.000 description 7
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- 230000008021 deposition Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
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- 238000005516 engineering process Methods 0.000 description 1
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- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
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- 238000012423 maintenance Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000003380 propellant Substances 0.000 description 1
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Images
Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/122—Gas lift
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/128—Adaptation of pump systems with down-hole electric drives
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK 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
- E21B43/129—Adaptations of down-hole pump systems powered by fluid supplied from outside the borehole
Definitions
- the present invention relates to a plant and a method for producing hydrocarbons.
- the present invention also relates to a method of upgrading a hydrocarbon production facility.
- curves 112 and 122 thus correspond to wells of Lg lower than the characteristic well represented by curve 102, the Lg of curve well 122 being itself lower than the Lg of curve well 112.
- the curves 104 and 114 of the figure 1 correspond respectively to the performance of a gas lift said light and the performance of a gas lift said strong.
- the so-called light gas lift has two operating points with the curve well 102 of which point 106 allowing a larger flow, Q, production of the well.
- the so-called lightweight gas lift has no operating point with the lower Lg wells like the wells of curves 112 and 122.
- the gas lift said weak thus allows the exploitation of wells of Lg between 0.6 and 1, 0.
- the introduction of the so-called heavy gas lift then ensures the operation of the curve well 112 at the operating point 112 but does not make it possible to operate the curve well 122 with which it has no operating point.
- the gas lift says strong allows the exploitation of wells of Lg between 0.3 and 0.5. In other words the gas lift, even strong, is insufficient to exploit the wells of Lg too low.
- the document WO-A2-2013 / 011307 relates to a method of positioning a pump in a well for generating an artificial lift effect in which the pump is coupled to a turbine driven by a propellant.
- the installation comprises a mechanical transmission shaft connecting the pneumatic motor to the pump.
- the pneumatic motor is an electric generator.
- the pump in the well is of the electric submersible type or of the progressive cavity type.
- the pump is disposed at the bottom of the well.
- the injection line opens at the bottom of the well, preferably in the production tube of the hydrocarbon production line.
- the pneumatic motor is at the wellhead.
- the pneumatic motor is at the bottom of the well.
- the injection line opens into the evacuation tube of the production line, downstream of the circulation pump.
- the gas under pressure is at a pressure greater than or equal to 70 bars before the expansion.
- the pressurized gas is expanded by the pneumatic motor at a pressure of less than or equal to 30 bars.
- the hydrocarbon production facility comprises a hydrocarbon well 22.
- the installation comprises a production line having a production tube 24 in the well 22 and a tube 26 on the discharge surface from the production tube 24.
- the tube 26 on the surface allows for example the evacuation to a reservoir 28 for storing the hydrocarbon product.
- the tube 26 at the surface can also be used to evacuate the products 82, brought up by the production tube 24 and comprising hydrocarbons 80, to devices (not shown) for separating the products 82.
- These product separation devices 82 can in particular separate water, gas and oil.
- the installation 20 comprises a hydrocarbon circulation pump of the well 22 in the production line making it easier to raise the hydrocarbons 80 by the production tube 24.
- This pump 40 can be placed at the bottom of the well 22 and is the remainder of this document referred to as the "bottom pump".
- Such a bottom pump 40 makes it possible to ensure or increase a production of hydrocarbons by the well 22, in particular in cases where the activation by injection of gas under pressure is insufficient to obtain a lowering of the hydrostatic pressure. or against pressure, of the well 22 making it possible to exploit the well 22.
- the pump 40 may be disposed in the tube 26 for evacuation at the surface. Such an arrangement of the pump 40 also makes it possible to increase the production by lowering the back pressure of the well 22 while facilitating the maintenance of the pump 40 which is then more accessible.
- the pump 40 is driven by a turbine 30.
- the positioning of the turbine 30 is embodied in the figures on the one hand by means of discontinuous lines and on the other hand by the schematic representation of blades 32 of the turbine 30.
- This turbine 30 is disposed in a line 36 of gas 38 under pressure so as to be rotated by the expansion of the gas 38 under pressure.
- the turbine 30 supplies the pump 40 with energy, this energy coming from the expansion of the gas 38 under pressure.
- the turbine 30 can be replaced by any other type of pneumatic motor, an engine pneumatic converter converting stored energy in a compressed gas into mechanical energy.
- the turbine can be replaced by any other hydrodynamic-type tire or a pneumatic type volumetric motor, the air motor then comprises a relaxation chamber whose volume is variable.
- the pneumatic type volumetric motor proposed can thus correspond to a pneumatic piston engine circumferential.
- the air motor such as in the form of the turbine 30, may be provided with a deflection, otherwise known as " bypass ".
- bypass a deflection
- the proposed installation may comprise a speed controller integrated in the pneumatic motor.
- the speed of the turbine or the pneumatic motor can be transmitted on the surface in the form of a sound via the production tube 24 of the well 22. impact frequency at each rotation of the pneumatic motor to be characteristic of the rotational speed of the pneumatic motor.
- the transmission of the kinetic energy of the turbine 30 to the pump can be carried out using a shaft 42 (shown in broken lines) rotated.
- This shaft 42 of mechanical transmission connects the turbine 30 to the pump 40.
- the mechanical connection between the turbine 30 and the pump 40 comprises a gear 44 for modulating the speed of rotation of the shaft 42 causing the actuation of the pump 40.
- the shaft 42 is then split into two parts, a part connecting the turbine 30 to the gearbox 44 and another portion connecting the gearbox 44 to the pump 40.
- Such a gearbox may be of the magnetic type to obtain a high conversion ratio.
- the mechanical connection between the turbine 30 and the pump 40 may also include a clutch (not shown).
- the shaft 42 may comprise various hinges 46.
- the transmission to the pump 40 of the energy recovered by the turbine 30 is then achieved without additional energy conversion.
- the turbine 30 may be an electric generator.
- the energy transmitted from the turbine 30 to the pump 40 is then electrical to overcome the mechanical constraints associated with the use of the shaft 42 of mechanical transmission especially when the trajectory of the well 22 is too aggressive.
- the bottom pump 40 may be of the electric submersible type (pump type also referred to as " Electric Submersible Pump “ abbreviated as "ESP” ).
- the bottom pump 40 may be of the progressive cavity type (pump type also referred to as " Progressive Cavity Pump “ abbreviated as "PCP” ).
- the use of a progressive cavity pump makes it possible to stabilize the well 22 by allowing a direct control of the flow rate of the well 22.
- the mechanical transmission of the power of the pneumatic motor in the form of a turbine 30 at the pump 40 limits the presence of electrical equipment downhole. In such a case of mechanical power transmission, the life of the installation is improved due to the independence of the proposed installation to such electrical equipment downhole 22.
- the pressurized gas 38 driving the turbine 30 comes from a source 34 of pressurized gas, at the surface with respect to the well 22, the source illustrated here in the form of a reservoir.
- sources 34 of pressurized gas are generally available on the surface in known hydrocarbon production facilities.
- the presence of pressurized gas sources on the surface is particularly required in the case of installations activated by injection of pressurized gas into the production line (production process also known as " gas lift "). .
- the proposed installation 20 allows the driving of the bottom pump 40 facilitating the production of hydrocarbons and this in the absence of additional power distribution network.
- the proposed installation 20 is particularly advantageous when the production facility is remote from any electrical production site or inhabited place.
- the upgrade of a hydrocarbon production facility corresponds to the adaptation of existing facilities to the previously described solution.
- the devices already present before the upgrade of the installation are for example the well 22, the production line, the source 34 of pressurized gas and the injection line 36 of the pressurized gas 38 in the production line.
- Such an upgrading method adds the bottom pump 40, or the surface pump, and the turbine 30 or other pneumatic motor to these devices already present in the installation to be leveled.
- the method comprises placing the pump 40 in the well 22 or on the surface and placing it on the injection line 36 of the turbine 30 for supplying the pump with energy.
- the upgrading method can of course include the implementation of any other device described in this document and in particular the establishment of one, more or all devices in interaction with the pump 40 and / or with the turbine 30, such as for example the mechanical transmission shaft 42 and the gearbox 44.
- Such a method firstly comprises supplying pressurized gas 38 from the source 34 of pressurized gas, at the surface. This step allows the recovery of energy already available on production facilities by gas lift.
- the source 34 may for example provide the gas 38 before expansion at a pressure greater than or equal to 70 bars or of the order of 65 bars.
- the pressurized gas 38 may be expanded by the turbine 30 to a pressure of less than or equal to 30 bar.
- This energy recovered in kinetic form is retransmitted in this form or in another form, such as in the form of electrical energy, to the pump 40 in the well 22 for its actuation.
- the bottom pump 40 contributes to the surface rise of the hydrocarbons 80 of the production well via the hydrocarbon production line to the tank 28.
- the gas 38 after expansion can be injected into the hydrocarbon production line.
- the gas under pressure 38 after expansion then has a lower injection pressure compared to the case where the pressurized gas 38 is injected into the production line without prior expansion or too high pressure such as 70 or 65 bar.
- the lower injection pressure makes it possible to avoid excessive instantaneous flow (also known as steam break through ).
- instantaneous flow also known as steam break through
- the lower injection pressure also makes it possible to avoid runaway in the event of instantaneous vaporization (also known as the " steam flashing " phenomenon).
- the system makes it possible to limit without risk the over-cooling, difference between the hydrocarbon temperature and the evaporation temperature of these hydrocarbons at the same pressure (over-cooling corresponding to the English term "sub-cool” ).
- the over-cooling can then be lower without risk of runaway, that is to say without risk of spraying.
- the hydrocarbons to be produced are hotter, less viscous and therefore easier to extract.
- the gas injection line 36 opens at the surface into the evacuation tube 26 of the production line.
- the expanded pressurized gas 38 is thus injected into the surface portion of the production line referred to as "flow line” (of the English expression " flow line” ). Injection of the pressurized gas 38 into the surface portion of the production line makes it possible to reduce the hydrostatic pressure of the production line even when the pressure after expansion is low.
- the pressurized gas 38 is provided to be injected into the production line at the production tube 24, so as to activate the production of hydrocarbons 80.
- the injection line 36 is in the form of an annulus around the production tube 24.
- the gas 38 is expanded by the turbine 30 before being injected into the production line of the well 22.
- the production of hydrocarbons is facilitated on the one hand by the bottom pump 40 and on the other hand by the injection of gas.
- the injection of gas into the production line of the well 22 as illustrated in FIG. figure 3 corresponds to a gas lift technique , ie activation by gas injection.
- the injection of the expanded gas 38 is carried out "downhole" above the location of the bottom pump 40, directly in the production line at the level of the production tube 24.
- gas injection is performed downstream of the pump in the production line.
- the term "downhole” is used in this document as characterizing a positioning close to the geological layers forming the reservoir of the hydrocarbon reservoir exploited by the well 22. This expression is used in opposition to the expressions “wellhead "and” on the surface ".
- the term “surface” characterizes in this document a positioning at ground level, above the ground or immediately below the ground. A device disposed on the surface can thus correspond to a device buried at a negligible depth relative to the depth of the well.
- the expression “at the wellhead” characterizes in this document a “surface” positioning, in line with the well, that is to say at the vertical of the well. Thus the distance between a "wellhead” positioning and a “well bottom” positioning is substantially equal to the length of the trajectory of the well 22.
- the mixed lines modeling the interrupted view of the well 22 in the figures separate from the one part the wellhead and the surface, above the mixed lines, the well bottom 22 on the other hand, below the mixed lines.
- the turbine 30 is disposed at the wellhead 22.
- the arrangement of the turbine 30 at the surface makes it possible to prevent the expansion of the pressurized gases 38 at the turbine 30 from cooling the hydrocarbon 80 downhole 22.
- the cooling of the hydrocarbon 80 by the gas can for example, to cause deposition formation, such as paraffin deposition formation for paraffinic hydrocarbons, otherwise referred to as paraffinic crude.
- the embodiments illustrated in figures 2 and 3 then have the advantage of facilitating the management of the deposit formation risk which is limited at the level of the injection of the expanded gas 38 into the production line, either at the surface of the well or at the wellhead, respectively.
- the embodiment illustrated in figure 3 possibly allows to have more diameter.
- Such an embodiment is then particularly preferred for the production of hydrocarbons present in the form of "heavy oil".
- the bottom pump 40 is preferably of the PCP type.
- the use of the PCP type pump 40 for the production of "heavy oil” makes it possible to stabilize the activation by gas injection and better control of the flow, especially at the beginning of production after the injection of the gas under pressure. in the production line.
- the pressurized gas 38 can be heated after having been expanded by the turbine 30.
- the surface positioning of the turbine 30 also contributes to facilitating the architecture of the installation. Indeed, in the mechanical transmission variants of the energy of the turbine 30 to the pump 40, the gearbox 44 can be very bulky, particularly in the case where the gear 44 is of the magnetic type.
- the surface arrangement of the turbine 30 then allows the surface arrangement of the gearbox 44 between the turbine 30 and the pump 40, the surface being less subject to space constraints than the bottom of the well 22.
- the proposed installation allows a lowering of the pressure in the well 22 according to the diagram of the figure 4 .
- the figure 4 shows a diagram of the evolution of the pressure, P, as a function of the vertical depth, H, in the well 22.
- the point BH abbreviation of the expression English "Bottom Hole ", corresponds to the vertical depth at the bottom of the well.
- the installation illustrated in figure 3 allows the pressure to follow the curve 140 having a pressure decrease 142 to the depth at which the pump 40 is disposed. This reduction in pressure 142 makes it possible to obtain a low downhole pressure at point 144.
- This low pressure at point 144 is to be compared with the pressure obtained at point 132, which is the hydrostatic pressure of the hydrocarbons at the bottom of the well.
- Point 132 is the point of the hydrostatic pressure curve in broken lines 130 at the depth at the bottom of the well.
- the curve 130 corresponds to the evolution of the pressure in the well in the natural state, that is to say in the absence of particular devices in the well to facilitate the production of the well.
- the downhole pressure obtained using the proposed installation corresponds, with respect to hydrostatic pressure point 132 downhole 22, to a pressure drop 146 (also referred to as " draw down”). ) promoting the extraction of hydrocarbons from the well 22.
- the use of a portion of the energy of the gas under pressure to actuate the bottom pump 40 and the other part of the pressurized gas energy used in gas lift allows double- strand extraction of hydrocarbons from well 22 from a single source.
- the pressure as a function of the depth follows the curve in thin line 134 to reach a downhole pressure at point 136.
- This pressure at the bottom of the well 22 allows a lower pressure drop 138 than the pressure drop 146 allowed by the proposed installation.
- the double-effect extraction from a single source then allows a greater production of the well 22 in comparison with the use of all the energy of the pressurized gas gas lift.
- the injection of the pressurized gas after the expansion corresponds in fact to a use of the gas lift in its effective range, such as for pressures of the order of or less than 30 bar, the excess energy being used in the form of mechanical energy for driving the pump 40.
- pressure levels of the pressurized gas 38 of the order of 70 bars or 65 bars can be achieved with pressure levels of the pressurized gas 38 of the order of 70 bars or 65 bars.
- the use of pressure levels of the order of 70 bar or 65 bar limits the risk of wear of the installation and increases the number of usable technologies compared to the use of higher pressures in gas lift to obtain a efficiency comparable to that of the proposed double-effect extraction.
- the figure 5 shows an embodiment of the installation where the turbine 30 is disposed downhole.
- This embodiment is particularly advantageous when the hydrocarbons 80 to produce are very hot.
- the heat of the hydrocarbons 80 to be produced limits the influence on the production of the cooling of the hydrocarbons 80 by the injection of the pressurized gas 38 expanded.
- the pump 40 may be of rotodynamic type at high speed, preferably a high temperature electric submersible pump (pump type also designated by the expression English " Electric Submersible Pump High Temperature " abbreviated " ESP-HT ”) more expensive.
- the arrangement of the turbine 30 downhole can also be considered when it is planned to preheat the pressurized gas 38 in the annular portion of the injection line 36, to limit the cooling of the hydrocarbons to be produced. In all cases, because of the positioning at the bottom of the well of the turbine, the gas under pressure before expansion is hotter than in the embodiments described above with reference to figures 2 and 3 .
- the embodiment illustrated in figure 5 with the downhole air motor 22, shown as a turbine 30, is preferred to the embodiment illustrated in FIG. figure 3 with the engine at the wellhead for the aforementioned phase of stimulation of the well 22 when the hydrocarbons are heavy oils.
- the embodiment illustrated in figure 5 is also preferred for wells 22 of standard crudes.
- the embodiment illustrated in figure 3 is preferred for the aforementioned phase of ramping up the operation of the well 22 when the hydrocarbons are heavy oils.
- the injection of gases under expanded pressure can be carried out for the same hydrocarbon production facility both in the production tube 24 downhole and in the discharge tube 26 at the surface.
- Such a variant thus corresponds to the combination of the embodiments illustrated by the figure 2 and by figure 3 .
- the injection line of the pressurized gas may comprise one or more boosters (not shown) to increase the pressure of the gas under pressure upstream of the turbine.
- boosters also known as the boosters to increase the pressure of the gas under pressure upstream of the turbine. This increase in pressure allowed by the boosters makes it possible to have more energy for the turbine and / or more energy after the expansion performed for the turbine for the activation of the well by injection of the expanded gas. This increase in pressure by the boosters ultimately allows an even greater improvement in the production of the well.
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Description
La présente invention concerne une installation et un procédé de production d'hydrocarbures. La présente invention se rapporte aussi à un procédé de mise à niveau d'une installation de production d'hydrocarbures.The present invention relates to a plant and a method for producing hydrocarbons. The present invention also relates to a method of upgrading a hydrocarbon production facility.
Dans le domaine de la production des hydrocarbures, il est connu de recourir à l'injection de gaz sous pression dans un puits de production d'hydrocarbures pour améliorer la production de ce puits. Les documents
La
- Lg est le gradient de portance naturelle du puits ;
- BHP est la pression de fond de puits en bars (abréviation de l'expression anglaise équivalente "Bottom Hole Pressure")
- THP est la pression à la tête du puits en bars (abréviation issue de l'expression anglaise "Tubing Hanger Pressure") ;
- H est la profondeur verticale du puits en m.
- Lg is the natural lift gradient of the well;
- BHP is the downhole pressure in bars (abbreviation of the equivalent English expression "Bottom Hole Pressure ")
- THP is the pressure at the wellhead in bars (abbreviation from the English term "Tubing Hanger Pressure ");
- H is the vertical depth of the well in m.
Les caractéristiques de courbes 112 et 122 correspondent ainsi à des puits de Lg plus faible que le puits de caractéristique représentée par la courbe 102, le Lg de du puits de courbe 122 étant lui-même plus faible que le Lg du puits de courbe 112.The characteristics of
Les courbes 104 et 114 de la
De plus, le document
Il existe donc un besoin pour un procédé et une installation de production d'hydrocarbures dans le cas où l'activation par injection de gaz est insuffisante pour obtenir un abaissement de la pression hydrostatique du puits permettant d'exploiter le puits.There is therefore a need for a process and a facility for producing hydrocarbons in the case where activation by gas injection is insufficient to obtain a lowering of the hydrostatic pressure of the well making it possible to exploit the well.
Pour cela, l'invention propose une installation de production d'hydrocarbures, comprenant :
- un puits d'hydrocarbures ;
- une ligne de production d'hydrocarbures comprenant :
- * dans le puits, un tube de production, et
- * en surface, un tube d'évacuation depuis le tube de production ;
- en surface, une source de gaz sous pression ;
- une ligne d'injection du gaz sous pression dans la ligne de production d'hydrocarbures, la ligne d'injection étant reliée à la source de gaz sous pression ;
- une pompe de circulation d'hydrocarbures du puits dans la ligne de production d'hydrocarbures ;
- un moteur pneumatique d'alimentation en énergie de la pompe, disposé sur la ligne d'injection du gaz sous pression et adapté à être entrainé en rotation par détente du gaz sous pression.
- a hydrocarbon well;
- a hydrocarbon production line comprising:
- * in the well, a production tube, and
- * on the surface, an evacuation tube from the production tube;
- on the surface, a source of gas under pressure;
- a line for injecting the gas under pressure into the hydrocarbon production line, the injection line being connected to the source of gas under pressure;
- a hydrocarbon circulation pump of the well in the hydrocarbon production line;
- a pneumatic pump power supply motor, disposed on the injection line of the gas under pressure and adapted to be rotated by expansion of the gas under pressure.
Selon une variante, l'installation comprend un arbre de transmission mécanique reliant le moteur pneumatique à la pompe.According to a variant, the installation comprises a mechanical transmission shaft connecting the pneumatic motor to the pump.
Selon une variante, le moteur pneumatique est un générateur électrique.According to one variant, the pneumatic motor is an electric generator.
Selon une variante, la pompe dans le puits est du type submersible électrique ou du type progressive à cavité.According to one variant, the pump in the well is of the electric submersible type or of the progressive cavity type.
Selon une variante, la pompe est disposée en fond de puits.According to one variant, the pump is disposed at the bottom of the well.
Selon une variante, la ligne d'injection débouche en fond de puits, de préférence dans le tube de production de la ligne de production d'hydrocarbures.According to a variant, the injection line opens at the bottom of the well, preferably in the production tube of the hydrocarbon production line.
Selon une variante, le moteur pneumatique est en tête de puits.According to one variant, the pneumatic motor is at the wellhead.
Selon une variante, le moteur pneumatique est en fond de puits.According to one variant, the pneumatic motor is at the bottom of the well.
Selon une variante, la ligne d'injection débouche dans le tube d'évacuation de la ligne de production, en aval de la pompe de circulation.According to a variant, the injection line opens into the evacuation tube of the production line, downstream of the circulation pump.
L'invention propose aussi un procédé d'exploitation d'un puits de production d'hydrocarbures activé par injection de gaz, comprenant :
- a) la fourniture d'un gaz sous pression à partir d'une source en surface de gaz sous pression ;
- b) la récupération d'énergie par la détente du gaz sous pression à l'aide d'un moteur pneumatique ;
- c) l'actionnement d'une pompe de circulation d'hydrocarbures du puits au moyen de l'énergie récupérée à l'étape b) ;
- d) l'injection du gaz sous pression détendu dans une ligne de production d'hydrocarbures.
- a) supplying a gas under pressure from a surface source of gas under pressure;
- b) the recovery of energy by the expansion of the gas under pressure using a pneumatic motor;
- c) actuating a hydrocarbon circulation pump of the well by means of the energy recovered in step b);
- d) injection of the pressurized gas expanded in a hydrocarbon production line.
Selon une variante, le gaz sous pression est à une pression supérieure ou égale à 70 bars avant la détente.According to a variant, the gas under pressure is at a pressure greater than or equal to 70 bars before the expansion.
Selon une variante, le gaz sous pression est détendu par le moteur pneumatique à une pression inférieure ou égale à 30 bars.According to a variant, the pressurized gas is expanded by the pneumatic motor at a pressure of less than or equal to 30 bars.
L'invention propose encore un procédé de mise à niveau d'une installation de production d'hydrocarbures, l'installation comprenant :
- un puits d'hydrocarbures ;
- une ligne de production d'hydrocarbures comprenant :
- * dans le puits, un tube de production, et
- * en surface, un tube d'évacuation depuis le tube de production ;
- en surface, une source de gaz sous pression ;
- une ligne d'injection du gaz sous pression dans la ligne de production d'hydrocarbures, la ligne d'injection étant reliée à la source de gaz sous pression ;
- la mise en place d'une pompe de circulation d'hydrocarbures du puits ; et
- la mise en place, sur la ligne d'injection du gaz sous pression, d'un moteur pneumatique d'alimentation en énergie de la pompe, adapté à être entrainé en rotation par détente du gaz sous pression.
- a hydrocarbon well;
- a hydrocarbon production line comprising:
- * in the well, a production tube, and
- * on the surface, an evacuation tube from the production tube;
- on the surface, a source of gas under pressure;
- a line for injecting the gas under pressure into the hydrocarbon production line, the injection line being connected to the source of gas under pressure;
- the installation of a hydrocarbon circulation pump of the well; and
- the introduction, on the injection line of the pressurized gas, of a pneumatic motor for supplying the pump with energy, adapted to be rotated by expansion of the gas under pressure.
D'autres caractéristiques et avantages de l'invention apparaîtront à la lecture de la description détaillée qui suit des modes de réalisation de l'invention, donnés à titre d'exemple uniquement et en référence aux dessins qui montrent :
-
Figure 1 , un diagramme de différentes caractéristiques de productivité en relation avec la pression d'écoulement au fond du puits et le débit d'écoulement ; -
Figure 2 , une vue schématique en coupe d'un mode de réalisation d'une installation de production d'hydrocarbures ; -
Figure 3 , une vue schématique en coupe d'un mode de réalisation avec gas lift de l'installation de production d'hydrocarbures ; -
Figure 4 , un diagramme d'évolution de la pression en fonction de la profondeur dans un puits pour différentes méthodes d'exploitation du puits ; -
Figure 5 , une vue schématique en coupe d'un autre mode de réalisation avec gas lift de l'installation de production d'hydrocarbures.
-
Figure 1 a diagram of different productivity characteristics in relation to well bottom flow pressure and flow rate; -
Figure 2 , a schematic sectional view of an embodiment of a hydrocarbon production facility; -
Figure 3 , a schematic sectional view of an embodiment with gas lift of the hydrocarbon production facility; -
Figure 4 , a graph of pressure versus depth in a well for different methods of well exploitation; -
Figure 5 , a schematic sectional view of another embodiment with gas lift of the hydrocarbon production facility.
Il est proposé une installation de production d'hydrocarbures. En référence à la
L'installation 20 comprend une pompe 40 de circulation d'hydrocarbures du puits 22 dans la ligne de production permettant de faciliter la remontée des hydrocarbures 80 par le tube de production 24. Cette pompe 40 peut être disposée au fond du puits 22 et est dans la suite de ce document désignée par l'expression "pompe de fond". Une telle pompe de fond 40 permet d'assurer ou d'augmenter une production d'hydrocarbures par le puits 22, en particulier dans les cas où l'activation par injection de gaz sous pression est insuffisante pour obtenir un abaissement de la pression hydrostatique, ou contre pression, du puits 22 permettant d'exploiter le puits 22. En alternative non illustré, la pompe 40 peut être disposée dans le tube 26 d'évacuation en surface. Une telle disposition de la pompe 40 permet aussi d'augmenter la production en abaissant la contre pression du puits 22 tout en facilitant la maintenance de la pompe 40 qui est alors plus accessible.The
Selon le mode de réalisation illustré en
La transmission de l'énergie cinétique de la turbine 30 à la pompe peut être réalisée à l'aide d'un arbre 42 (représenté en traits discontinus) entrainé en rotation. Cet arbre 42 de transmission mécanique relie la turbine 30 à la pompe 40. Telle qu'illustrée en
Selon le mode de réalisation illustré en
Le gaz 38 sous pression entraînant la turbine 30 provient d'une source 34 de gaz sous pression, en surface par rapport au puits 22, source illustrée ici sous la forme d'un réservoir. Or des sources 34 de gaz sous pression sont généralement disponibles en surface dans les installations connues de production d'hydrocarbures. En effet, la présence de sources de gaz sous pression en surface est notamment requise dans le cas d'installations activées par injection de gaz sous pression dans la ligne de production (procédé de production également désigné par l'expression anglaise "gas lift").The
En définitive, une telle source d'énergie étant déjà présente sur les installations connues de production d'hydrocarbures, l'installation proposée 20 permet l'entraînement de la pompe de fond 40 facilitant la production d'hydrocarbures et ce en l'absence de réseau supplémentaire de distribution de puissance.Ultimately, as such a power source is already present on known hydrocarbon production facilities, the proposed
En se passant de réseau supplémentaire de distribution de puissance, l'installation proposée 20 est particulièrement avantageuse lorsque l'installation 20 de production est éloignée de tout site de production électrique ou de lieu habité.By dispensing with additional power distribution network, the proposed
Il est particulièrement proposé un procédé de mise à niveau d'installation de production d'hydrocarbures. La mise à niveau d'une installation de production d'hydrocarbures correspond à l'adaptation des installations existantes à la solution précédemment décrite. Les dispositifs déjà présents avant la mise à niveau de l'installation sont par exemple le puits 22, la ligne de production, la source 34 de gaz sous pression et la ligne d'injection 36 du gaz sous pression 38 dans la ligne de production. Un tel procédé de mise à niveau rajoute la pompe de fond 40, ou la pompe en surface, et la turbine 30 ou tout autre moteur pneumatique à ces dispositifs déjà présents dans l'installation à mettre à niveau. En d'autres termes, le procédé comprend la mise en place de la pompe 40 dans le puits 22 ou en surface et la mise en place sur la ligne d'injection 36 de la turbine 30 d'alimentation en énergie de la pompe. Le procédé de mise à niveau peut bien entendu comprendre la mise en place de tout autre dispositif décrit dans ce document et en particulier la mise en place d'un, de plusieurs ou de tous dispositifs en interaction avec la pompe 40 et/ ou avec la turbine 30, tel que par exemple l'arbre de transmission mécanique 42 et le réducteur 44.It is particularly proposed a method of upgrading a hydrocarbon production facility. The upgrade of a hydrocarbon production facility corresponds to the adaptation of existing facilities to the previously described solution. The devices already present before the upgrade of the installation are for example the well 22, the production line, the
Par ailleurs, il est aussi proposé un procédé de production d'hydrocarbures reprenant les principes de fonctionnement de l'installation 20 de production d'hydrocarbures proposée. Un tel procédé comprend tout d'abord la fourniture du gaz sous pression 38 à partir de la source 34 de gaz sous pression, en surface. Cette étape permet la récupération d'une énergie déjà disponible sur des installations de production par gas lift. La source 34 peut par exemple fournir le gaz 38 avant détente à une pression supérieure ou égale à 70 bars ou de l'ordre de 65 bars.Furthermore, it is also proposed a hydrocarbon production process incorporating the operating principles of the proposed hydrocarbon production facility. Such a method firstly comprises supplying
Cette énergie est ensuite récupérée par la détente du gaz sous pression 38 à l'aide de la turbine 30 ou tout autre moteur pneumatique. Le gaz en sous pression 38 peut être détendu par la turbine 30 jusqu'à une pression inférieure ou égale à 30 bars.This energy is then recovered by the expansion of the
Cette énergie récupérée sous forme cinétique est retransmise sous cette forme ou sous une autre forme, telle que sous forme d'énergie électrique, à la pompe 40 dans le puits 22 pour son actionnement. La pompe de fond 40 contribue à la remontée en surface des hydrocarbures 80 du puits de production par l'intermédiaire de la ligne de production d'hydrocarbures jusqu'au réservoir 28.This energy recovered in kinetic form is retransmitted in this form or in another form, such as in the form of electrical energy, to the
Le gaz 38 après détente peut être injecté dans la ligne de production d'hydrocarbures. Le gaz sous pression 38 après détente présente alors une pression d'injection plus faible par rapport au cas où le gaz sous pression 38 est injecté dans la ligne de production sans détente préalable ou à trop forte pression tel qu'à 70 ou 65 bars.The
Lors d'une phase de montée en régime de l'exploitation du puits (phase également désignée en anglais par le terme "ramp-up"), au début de l'exploitation du puits 22, la pression d'injection plus faible permet d'éviter un débit instantané excessif (phénomène également désigné par l'expression anglaise "steam break through"). Un tel phénomène intervient en effet lorsque la chute de pression procurée en fond de puits par le gas lift est trop importante et nuit à la productivité du puits. La pression d'injection plus faible permet également d'éviter l'emballement en cas de vaporisation instantanée (phénomène également désigné par l'expression anglaise "steam flashing").During a ramp-up phase of well operation (also known as ramp-up ), at the start of the operation of well 22, the lower injection pressure makes it possible to avoid excessive instantaneous flow (also known as steam break through ). Such a phenomenon occurs in fact when the pressure drop provided at the bottom of the well by the gas lift is too great and adversely affects the productivity of the well. The lower injection pressure also makes it possible to avoid runaway in the event of instantaneous vaporization (also known as the " steam flashing " phenomenon).
Lors d'une phase de stimulation du puits (phase également désignée par le terme anglais "boosting"), mise en oeuvre quand la production du puits 22 commence à décliner, le système permet de limiter sans risque le sur-refroidissement, différence entre la température des hydrocarbures et la température d'évaporation de ces hydrocarbures à la même pression (sur-refroidissement correspondant au terme anglais "sub-cool"). Le sur-refroidissement peut alors être plus faible sans risque d'emballement, c'est-à-dire sans risque de vaporisation. En limitant le sur-refroidissement, les hydrocarbures à produire sont plus chaud, moins visqueux et donc plus facile à extraire.During a phase of stimulation of the well (also known as " boosting " phase), implemented when the production of the well 22 begins to decline, the system makes it possible to limit without risk the over-cooling, difference between the hydrocarbon temperature and the evaporation temperature of these hydrocarbons at the same pressure (over-cooling corresponding to the English term "sub-cool" ). The over-cooling can then be lower without risk of runaway, that is to say without risk of spraying. By limiting the over-cooling, the hydrocarbons to be produced are hotter, less viscous and therefore easier to extract.
La suite de ce document expose particulièrement les différences entre les modes de réalisation d'installations 20 de production d'hydrocarbures fonctionnant selon le procédé précédent.The remainder of this document particularly sets out the differences between the embodiments of hydrocarbon production installations operating according to the preceding method.
Conformément au mode de réalisation de l'installation de production spécifiquement illustré en
Selon un autre mode de réalisation illustré en
L'expression "en fond de puits" est utilisée dans ce document comme caractérisant un positionnement proche des couches géologiques formant le réservoir du gisement d'hydrocarbures exploité par le puits 22. Cette expression est utilisée en opposition avec les expressions "en tête de puits" et "en surface". L'expression "en surface" caractérise dans ce document un positionnement au niveau du sol, au-dessus du sol ou immédiatement en-dessous du sol. Un dispositif disposé en surface peut ainsi correspondre à un dispositif enfoui à une profondeur négligeable par rapport à la profondeur du puits. L'expression "en tête de puits" caractérise dans ce document un positionnement "en surface", à l'aplomb du puits, c'est-à-dire à la verticale du puits. Ainsi la distance entre un positionnement "en tête de puits" et un positionnement "en fond du puits" est sensiblement égale à la longueur de la trajectoire du puits 22. Les traits mixtes modélisant la vue interrompue du puits 22 dans les figures séparent d'une part la tête de puits et la surface, au-dessus des traits mixtes, du fond de puits 22 d'autre part, en-dessous des traits mixtes.The term "downhole" is used in this document as characterizing a positioning close to the geological layers forming the reservoir of the hydrocarbon reservoir exploited by the well 22. This expression is used in opposition to the expressions "wellhead "and" on the surface ". The term "surface" characterizes in this document a positioning at ground level, above the ground or immediately below the ground. A device disposed on the surface can thus correspond to a device buried at a negligible depth relative to the depth of the well. The expression "at the wellhead" characterizes in this document a "surface" positioning, in line with the well, that is to say at the vertical of the well. Thus the distance between a "wellhead" positioning and a "well bottom" positioning is substantially equal to the length of the trajectory of the well 22. The mixed lines modeling the interrupted view of the well 22 in the figures separate from the one part the wellhead and the surface, above the mixed lines, the well bottom 22 on the other hand, below the mixed lines.
Dans le mode de réalisation illustré en
En outre, le mode de réalisation illustré en
Le positionnement en surface de la turbine 30 contribue aussi à faciliter l'architecture de l'installation. En effet, dans les variantes de transmission mécanique de l'énergie de la turbine 30 à la pompe 40, le réducteur 44 peut être très volumineux, particulièrement dans le cas où le réducteur 44 est du type magnétique. La disposition en surface de la turbine 30 permet alors la disposition en surface du réducteur 44 entre la turbine 30 et la pompe 40, la surface étant moins soumise à des contraintes d'encombrement que le fond du puits 22.The surface positioning of the
L'installation proposée, notamment telle qu'illustrée en
Lors de la mise en place d'un gas lift classique dans le puits 22, c'est-à-dire à l'aide du même gaz sous pression 38 mais sans détente avant injection, la pression en fonction de la profondeur suit la courbe en trait fin 134 pour atteindre une pression en fond de puits au point 136. Cette pression au fond du puits 22 permet une chute de pression 138 moins importante que la chute de pression 146 permise par l'installation proposée. L'extraction par double effet à partir d'une source unique permet alors une production plus importante du puits 22 en comparaison à l'utilisation de la totalité de l'énergie du gaz sous pression en gas lift. L'injection du gaz sous pression après la détente correspond en effet à une utilisation du gas lift dans son domaine efficace, tel que pour des pressions de l'ordre de ou inférieure à 30 bars, l'énergie excédentaire étant utilisée sous forme d'énergie mécanique pour l'entraînement de la pompe 40.When setting up a conventional gas lift in the well 22, that is to say using the same
Par ailleurs, cette production plus importante peut être réalisée avec des niveaux de pression du gaz sous pression 38 de l'ordre 70 bars ou 65 bars. L'utilisation de niveaux de pression de l'ordre de 70 bars ou 65 bars limite les risques d'usure de l'installation et augmente le nombre de technologies utilisables en comparaison à l'utilisation de pressions plus élevées en gas lift pour obtenir une efficacité comparable à celle de l'extraction par double effet proposée.Moreover, this larger production can be achieved with pressure levels of the
En alternative au positionnement de la turbine 30 en surface, la
Le mode de réalisation illustré en
Bien entendu, la présente invention n'est pas limitée aux exemples et aux modes de réalisation décrits et représentés, mais elle est susceptible de nombreuses variantes accessibles à l'homme de l'art.Of course, the present invention is not limited to the examples and embodiments described and shown, but it is capable of numerous variants accessible to those skilled in the art.
En particulier, l'injection des gaz sous pression détendu peut être réalisée pour une même installation de production d'hydrocarbures à la fois dans le tube de production 24 en fond de puits et dans le tube de refoulement 26 en surface. Une telle variante correspond ainsi à la combinaison des modes de réalisation illustrés par la
Par ailleurs, en complément de la pompe de fond 40 et de l'éventuel gas lift, la ligne d'injection du gaz sous pression peut comprendre un ou des surpresseurs (non représentés) pour augmenter la pression du gaz sous pression en amont de la turbine. Cette augmentation de pression permise par les surpresseurs permet de disposer de plus d'énergie pour la turbine et/ou de plus d'énergie après la détente réalisée pour la turbine pour l'activation du puits par injection du gaz détendu. Cette augmentation de pression par les surpresseurs permet en définitive une amélioration encore plus importante de la production du puits.Furthermore, in addition to the
Claims (12)
- Hydrocarbon production facility, comprising:- a well (22) of hydrocarbons;- a hydrocarbon production line comprising:* in the well (22), a production tube (24), and* on the surface, an evacuation tube (26) from the production tube (24) ;- on the surface, a source (34) of pressurized gas (38);- an injection line (36) of pressurized gas (38) in the hydrocarbon production line, the injection line (36) being connected to the source (34) of pressurized gas (38) and which opens into the evacuation tube (26) of the production line, downstream of the circulation pump (40);- a pump (40) for circulation of hydrocarbon from the well (22) to the hydrocarbon production line;- a pneumatic motor (30) for supplying power to the pump (40), disposed on the injection line (36) of the pressurized gas (38) and adapted to be rotated by expansion of the pressurized gas (38).
- A facility according to claim 1, comprising a mechanical transmission shaft (42) connecting the pneumatic motor (30) to the pump (40).
- A facility according to claim 1, where the pneumatic motor (30) is an electric generator.
- A facility according to one of claims 1 to 3, wherein the pump (40) in the well (22) is an electric submersible type or a progressive cavity type.
- A facility according to one of claims 1 to 4, wherein the pump (40) is disposed in the well bottom hole.
- A facility according to claim 5, wherein the injection line (36) opens into the well bottom hole (22), preferably in the production tube (24) of the hydrocarbon production line.
- A facility according to claim 6, wherein the pneumatic motor (30) is at the wellhead (22).
- A facility according to claim 6, wherein the pneumatic motor (30) is at the well bottom hole (22).
- A method of operating a hydrocarbon (80) production well (22) activated by gas injection, using the hydrocarbon production facility according to one of the claims 1 to 8 and comprising the well (22), the method comprising:a) providing a pressurized gas (38) from the pressurized gas (38) source (34) at the surface of the facility;b) recovering energy by the expansion of the pressurized gas (38) using the facility pneumatic motor (30);c) actuating the pump (40) for circulation of hydrocarbon from the well (22) using the energy recovered in step b);d) injecting an expanded pressurized gas (38) in a hydrocarbon production line of the facility.
- A method according to claim 9, wherein the pressurized gas (28) is at a pressure higher than or equal to 70 bars prior to expansion.
- A method according to claim 9 or 10, wherein the pressurized gas (38) is expanded by the pneumatic motor (30) at a pressure less than or equal to 30 bars.
- A method of operating a hydrocarbon (80) production well (22) activated by gas injection, using the hydrocarbon production facility according to one of the claims 1 to 8, the method making use of:- a well (22) of hydrocarbons;- a hydrocarbon production line comprising:* in the well (22), a production tube (24), and* on the surface, an evacuation tube (26) from the production tube (24);- on the surface, a source (34) of pressurized gas (38);- an injection line (36) of pressurized gas (38) in the hydrocarbon production line, the injection line (36) being connected to the source (34) of pressurized gas (38) and which opens into the evacuation tube (26) of the production line, downstream of the circulation pump (40);the method comprising the upgrade of the facility by:- positioning a pump (40) for circulation of hydrocarbon from the well (22); and- positioning, on the injection line (36) of pressurized gas (38), a pneumatic motor (30) for supplying power to the pump (40), adapted to be rotated by expansion of the pressurized gas (38).
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PCT/EP2014/072006 WO2015055645A1 (en) | 2013-10-14 | 2014-10-14 | Hydrocarbon production plant, production process and upgrading process |
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US3751192A (en) * | 1971-04-12 | 1973-08-07 | Borg Warner | Submersible pump drive system |
US5488993A (en) * | 1994-08-19 | 1996-02-06 | Hershberger; Michael D. | Artificial lift system |
EP0756065A1 (en) * | 1995-07-24 | 1997-01-29 | Shell Internationale Researchmaatschappij B.V. | System for controlling production from a gas-lifted oil well |
US6032737A (en) * | 1998-04-07 | 2000-03-07 | Atlantic Richfield Company | Method and system for increasing oil production from an oil well producing a mixture of oil and gas |
FR2783557B1 (en) | 1998-09-21 | 2000-10-20 | Elf Exploration Prod | CONDUCT METHOD OF AN ACTIVE HYDROCARBON PRODUCTION WELL BY GAS INJECTION |
GB0128262D0 (en) * | 2001-11-24 | 2002-01-16 | Rotech Holdings Ltd | Artificial lift pump |
US7445049B2 (en) * | 2002-01-22 | 2008-11-04 | Weatherford/Lamb, Inc. | Gas operated pump for hydrocarbon wells |
US20060000357A1 (en) * | 2004-03-23 | 2006-01-05 | Keith Michael | Method and system for producing inert gas from combustion by-products |
FR2944828B1 (en) | 2009-04-23 | 2012-08-17 | Total Sa | PROCESS FOR EXTRACTING HYDROCARBONS FROM A RESERVOIR AND AN EXTRACTION FACILITY FOR HYDROCARBONS |
WO2011127305A1 (en) * | 2010-04-07 | 2011-10-13 | David Randolph Smith | Submersible hydraulic artificial lift systems and methods of operating same |
US20110308812A1 (en) * | 2010-06-22 | 2011-12-22 | Terry Bullen | Artificial lift system |
GB201112460D0 (en) | 2011-07-20 | 2011-08-31 | Downhole Energy Ltd | Downhole pump and method of deployment |
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