WO1998057032A1 - A method and a system for improving the utilization of oil deposits from an underwater well at low reservoir pressure - Google Patents

A method and a system for improving the utilization of oil deposits from an underwater well at low reservoir pressure Download PDF

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Publication number
WO1998057032A1
WO1998057032A1 PCT/NO1998/000165 NO9800165W WO9857032A1 WO 1998057032 A1 WO1998057032 A1 WO 1998057032A1 NO 9800165 W NO9800165 W NO 9800165W WO 9857032 A1 WO9857032 A1 WO 9857032A1
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WO
WIPO (PCT)
Prior art keywords
well
petroleum
wells
gas
injection well
Prior art date
Application number
PCT/NO1998/000165
Other languages
French (fr)
Inventor
Terje GRØSFJELL
Johnny GRØSFJELL
Original Assignee
Grosfjell Invent As
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Filing date
Publication date
Application filed by Grosfjell Invent As filed Critical Grosfjell Invent As
Priority to AU80411/98A priority Critical patent/AU8041198A/en
Publication of WO1998057032A1 publication Critical patent/WO1998057032A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/12—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 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
    • E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
    • 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
    • E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
    • E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well

Definitions

  • This invention relates to a method and a system for improving the utilization of oil deposits from at least one underwater well at a low reservoir pressure, in order thereby to enable recovery of residual oil which, otherwise, could not have been transferred to a surface position.
  • the invention aims at injecting fluid, preferably gaseous fluid, under pressure in such a well that works at low - or too low - reservoir pressure, in order to establish a socalled “gas lift” or a socalled “mammoth pump” for, through an ejector or pump effect within the underwater well, to start an upwardly directed flow of gas which, into the stream thereof draws in and brings with it also oil which, otherwise, hardly would have let itself be transferred to the surface due to failing pressure of the reservoir.
  • fluid preferably gaseous fluid
  • U.S. 5 016 710 discloses in one embodiment a drain channel or pipeline perforated over a substantial longitudinal portion.
  • This drain channel is drilled slopingly from the seabed and terminates at certain distances from an underwater well, spaced both in the horizontal and vertical direction.
  • the drain channel conveys a stimulation agent which is leaked out into a formation through which the drain channel extends in a direction towards the underwater well.
  • stimulation of underwater formation aims at widening old channels or making new channels in production formations in an underwater well.
  • the effect of the stimulation agent is to cause a reduction in the flowing-out amount of oil to be produced, adjacent the drain channel.
  • the flowing-out oil to be produced will then, in accordance with conventional theory, flow towards the underwater well through the drain channel itself.
  • a displacement agent is used; in one case this agent is injected down into the annulus between the production riser and the casing and, in another case, it is leaked out into the formation through perforations in the underwater well.
  • this agent is injected down into the annulus between the production riser and the casing and, in another case, it is leaked out into the formation through perforations in the underwater well.
  • U.S. 5 016 710 one does not work with a gas lift.
  • stimulation of production formations is an expensive process, it being assumed that stimulation will be poorly adapted to the purpose and object of the present invention, namely to favour oil recovery at low reservoir pressure.
  • U.S. 4 682 652 discloses an installation or arrangement comprising two vertical underwater wells in combination with an underlying horizontal well and, contrary to the present invention, aims at realizing optimal oil recovery in the formation area defined by the three wells.
  • GB patent application 2 072 242 discloses two vertical wells lowermost connected to each other through a horizontal, preferably perforated well. Such a system can not be used in connection with the present invention either.
  • the object of the present invention has been to point out a rational method and an appropriate system for favouring oil recovery from one or more relatively closely placed underwater wells at low, respectively insufficient, reservoir pressure, wherein a gaseous fluid is injected into the underwater well(s) for the establishment of a gas lift which, upon upwardly flowing in underwater well/production riser string brings with it an amount of oil in addition to the one the prevailing reservoir pressure is capable of transferring to the surface, and without reducing the flow area in the underwater well/production riser string.
  • the starting-point is two adjacent underwater wells which may have produced oil for a long time, before the production rate eventually has been reduced significantly, so that it is desirable to increase the recovery rate.
  • one plugs one underwater well whereafter one drills an injection well from the plugged underwater well to the adjacent underwater well, from a place above the plug to a place preferably just above the reservoir of the adjacent underwater well for, thereafter, to supply a gaseous fluid to the plugged well and, from there, through the injection well to said adjacent well.
  • the outlet end portion of the injection well may point in any suitable direction in relation to said adjacent underwater well the oil recovery rate of which one desires to increase, i.e. that the angle the outlet axis of the injection well forms with the axis of the adjacent well at said outlet's connection point at the well is not critical for the mode of operation of the invention, because the amount of gas supplied to said adjacent underwater well per time unit just above the reservoir will cause a strong upwardly directed gas flow - the socalled gas lift -favouring the oil recovery in said adjacent well by compensating for a low reservoir pressure.
  • the injection well in such a direction at the outlet portion that the same passes into the adjacent upwardly directed well portion, pointing upwardly, so that gas supplied at the connection between the injection well and the underwater well creates an ejector effect.
  • An advantageous orientation of the opposite end portion of the injection well is achieved by letting it continue in the same or approximately the same direction as the underwater well portion from where said opposite injection well end portion emanates. Exhibiting such an orientation, the two end portions of an injection well may cause the latter to take an approximately U-shaped course concavely in an upward direction at two substantially vertical underwater wells having a somewhat gradual slope towards respective reservoir.
  • the producing underwater well when it has become unprofitable, it may be plugged below the injection well's connection end, the plugging of the hitherto plugged well then being neutralized, whereafter the gas flowing direction is reversed: Pressurized gas is supplied through the hitherto utilized well, through the injection well in the opposite direction, to the hitherto plugged underwater well.
  • the invention may, in accordance with another aspect thereof, utilize a template on the seabed, said template receiving gas from a surface position, to distribute the gas among said parallel wells, an injection well for each of the parallel wells being drilled from the template, each of said injection wells, preferably, exhibiting an upright connection portion coupled to the respective underwater well.
  • Figure 1 shows in side elevational view and vertical section a platform, two underwater wells extending downwardly from seabed level, the lower portions thereof diverging mutually, extending towards the respective reservoir thereof;
  • Figure 2 shows in a corresponding side elevational view and vertical section a platform, wherein four underwater wells extend downwardly from seabed level, and wherein on the seabed, horizontally spaced from the platform legs, is disposed a template equipped with a gas distributor and with gas supply from the platform.
  • the injection well 18 takes an upwardly concave, U-shaped course, so that it at both end portions takes place an uniform transition from and to, respectively, the well orientation.
  • the upwardly directed orientation of the outlet portion 18' of the injection well 18 from said first well will create a more typical ejector action at the connection place between the injection well 18 and said second underwater well 14 than when the gas is supplied in a downward direction. In all cases, the gas flow will turn upwardly upon arbitrary gas supply direction and form the desired gas lift.
  • FIG 2 In figure 2, four downwardly directed underwater wells 20, 22, 24 and 26 extend from a platform 10. It is desired to increase the recovery rate through the establishment of a gas lift within each well.
  • a template 28 On the seabed HB, a template 28 is disposed.
  • the template 28 is equipped with a gas distributor, gas being supplied thereto from the platform 10 or from somewhere else.
  • injections wells 30, 32 and 34 are drilled, one for each of three wells 22, 24, 26.
  • Each injection well 30, 32 and 34 has an upwardly directed outlet part.

Abstract

An account has been given of a method and a system for increasing the petroleum recovery rate in at least one (14) of two or more adjacent underwater wells (12, 14), in which the reservoir pressure has become so low that it within short is expected to be unsatisfactory for bringing petroleum from the formation up to the surface. To this end, it is known per se to inject gas into the first-mentioned underwater well (14), causing, however, a substantial, undesired reduction of the cross-sectional through flow area in the well (14) upon gas supply through coilable tubing. Therefore, it is intended to provide a rational petroleum recovery rate increase without any reduction of respective well's (14) cross-sectional through flow area, utilizing a preferably adjacent well (12), which is plugged (at 16) close to the reservoir. Above the plugged well portion (16), an injection well (18) is drilled to the first-mentioned well (14), whereafter gaseous fluid under pressure is supplied through said adjacent well (12) to the injection well (18, 18') and, from there, to the well whose petroleum recovery rate is to be favoured through the gas lift established within the well (14).

Description

A METHOD AND A SYSTEM FOR IMPROVING THE UTILIZATION OF OIL DEPOSITS FROM AN UNDERWATER WELL AT LOW RESERVOIR PRESSURE
This invention relates to a method and a system for improving the utilization of oil deposits from at least one underwater well at a low reservoir pressure, in order thereby to enable recovery of residual oil which, otherwise, could not have been transferred to a surface position.
Generally, the invention aims at injecting fluid, preferably gaseous fluid, under pressure in such a well that works at low - or too low - reservoir pressure, in order to establish a socalled "gas lift" or a socalled "mammoth pump" for, through an ejector or pump effect within the underwater well, to start an upwardly directed flow of gas which, into the stream thereof draws in and brings with it also oil which, otherwise, hardly would have let itself be transferred to the surface due to failing pressure of the reservoir.
In principle, this is known. According to prior art technique a coilable tubing is passed down into the underwater well, so that the outlet is situated exactly above the reservoir, whereafter "lifting gas" is pumped down through the coilable tubing, this pressurized gas leaving the coilable tubing at the lower outlet thereof for, thereafter, to flow out into the annulus between the underwater well and the coilable tubing as well as upwardly within the annulus.
An obvious disadvantage of such a known method for establishing a gas lift is the significant restriction of the flow area of the underwater well caused by the internal coilable tubing.
U.S. 5 016 710 discloses in one embodiment a drain channel or pipeline perforated over a substantial longitudinal portion. This drain channel is drilled slopingly from the seabed and terminates at certain distances from an underwater well, spaced both in the horizontal and vertical direction. The drain channel conveys a stimulation agent which is leaked out into a formation through which the drain channel extends in a direction towards the underwater well. Generally, stimulation of underwater formation aims at widening old channels or making new channels in production formations in an underwater well. The effect of the stimulation agent is to cause a reduction in the flowing-out amount of oil to be produced, adjacent the drain channel. The flowing-out oil to be produced will then, in accordance with conventional theory, flow towards the underwater well through the drain channel itself. In other embodiments according to this U.S. patent specification, a displacement agent is used; in one case this agent is injected down into the annulus between the production riser and the casing and, in another case, it is leaked out into the formation through perforations in the underwater well. However, according to U.S. 5 016 710 one does not work with a gas lift. Moreover, stimulation of production formations is an expensive process, it being assumed that stimulation will be poorly adapted to the purpose and object of the present invention, namely to favour oil recovery at low reservoir pressure.
U.S. 4 682 652 discloses an installation or arrangement comprising two vertical underwater wells in combination with an underlying horizontal well and, contrary to the present invention, aims at realizing optimal oil recovery in the formation area defined by the three wells.
According to U.S. 4 390 067 horizontal wells are drilled in oil-leading layers, oil being heated in the neighbourhood of the wells, in order to create a "hot floating corridor", in which oil is displaced from one end of the corridor to the other. Such a tecnology is useless in connection with the present invention.
GB patent application 2 072 242 discloses two vertical wells lowermost connected to each other through a horizontal, preferably perforated well. Such a system can not be used in connection with the present invention either.
The object of the present invention has been to point out a rational method and an appropriate system for favouring oil recovery from one or more relatively closely placed underwater wells at low, respectively insufficient, reservoir pressure, wherein a gaseous fluid is injected into the underwater well(s) for the establishment of a gas lift which, upon upwardly flowing in underwater well/production riser string brings with it an amount of oil in addition to the one the prevailing reservoir pressure is capable of transferring to the surface, and without reducing the flow area in the underwater well/production riser string.
Said object is achieved by proceeding in accordance with the following patent claims directed at method, respectively by means of a suitable and efficient system in accordance with the following apparatus claims.
In accordance with one aspect of the present invention, the starting-point is two adjacent underwater wells which may have produced oil for a long time, before the production rate eventually has been reduced significantly, so that it is desirable to increase the recovery rate. In accordance with the invention, one plugs one underwater well, whereafter one drills an injection well from the plugged underwater well to the adjacent underwater well, from a place above the plug to a place preferably just above the reservoir of the adjacent underwater well for, thereafter, to supply a gaseous fluid to the plugged well and, from there, through the injection well to said adjacent well.
In principle, the outlet end portion of the injection well may point in any suitable direction in relation to said adjacent underwater well the oil recovery rate of which one desires to increase, i.e. that the angle the outlet axis of the injection well forms with the axis of the adjacent well at said outlet's connection point at the well is not critical for the mode of operation of the invention, because the amount of gas supplied to said adjacent underwater well per time unit just above the reservoir will cause a strong upwardly directed gas flow - the socalled gas lift -favouring the oil recovery in said adjacent well by compensating for a low reservoir pressure.
However, in certain cases, it may be preferable to drill the injection well in such a direction at the outlet portion that the same passes into the adjacent upwardly directed well portion, pointing upwardly, so that gas supplied at the connection between the injection well and the underwater well creates an ejector effect.
An advantageous orientation of the opposite end portion of the injection well is achieved by letting it continue in the same or approximately the same direction as the underwater well portion from where said opposite injection well end portion emanates. Exhibiting such an orientation, the two end portions of an injection well may cause the latter to take an approximately U-shaped course concavely in an upward direction at two substantially vertical underwater wells having a somewhat gradual slope towards respective reservoir.
After som time, when the producing underwater well has become unprofitable, it may be plugged below the injection well's connection end, the plugging of the hitherto plugged well then being neutralized, whereafter the gas flowing direction is reversed: Pressurized gas is supplied through the hitherto utilized well, through the injection well in the opposite direction, to the hitherto plugged underwater well.
If a plurality of mutually adjacent underwater wells extend substantially parallel, the invention may, in accordance with another aspect thereof, utilize a template on the seabed, said template receiving gas from a surface position, to distribute the gas among said parallel wells, an injection well for each of the parallel wells being drilled from the template, each of said injection wells, preferably, exhibiting an upright connection portion coupled to the respective underwater well.
An examplary embodiment of the subject matter of the invention proper is illustrated on the accompanying drawings, in which:
Figure 1 shows in side elevational view and vertical section a platform, two underwater wells extending downwardly from seabed level, the lower portions thereof diverging mutually, extending towards the respective reservoir thereof;
Figure 2 shows in a corresponding side elevational view and vertical section a platform, wherein four underwater wells extend downwardly from seabed level, and wherein on the seabed, horizontally spaced from the platform legs, is disposed a template equipped with a gas distributor and with gas supply from the platform.
First, reference is made to figure 1, where in association with a platform 10, two underwater wells 12 and 14 extend downwardly from the seabed HB, a first well 12 plugged at 16, just above the reservoir, and a second well 14, in which one in this round, desires to favour the oil recovery rate.
To this end, an injection well 18 having an outlet 18', from a position just above the plug 16, has been drilled, said outlet 18' passing into said second well 14, just above the reservoir thereof.
In the examplary embodiment shown, the injection well 18 takes an upwardly concave, U-shaped course, so that it at both end portions takes place an uniform transition from and to, respectively, the well orientation. The upwardly directed orientation of the outlet portion 18' of the injection well 18 from said first well will create a more typical ejector action at the connection place between the injection well 18 and said second underwater well 14 than when the gas is supplied in a downward direction. In all cases, the gas flow will turn upwardly upon arbitrary gas supply direction and form the desired gas lift.
In figure 2, four downwardly directed underwater wells 20, 22, 24 and 26 extend from a platform 10. It is desired to increase the recovery rate through the establishment of a gas lift within each well. On the seabed HB, a template 28 is disposed. The template 28 is equipped with a gas distributor, gas being supplied thereto from the platform 10 or from somewhere else.
From the template 28, injections wells 30, 32 and 34 are drilled, one for each of three wells 22, 24, 26. Each injection well 30, 32 and 34 has an upwardly directed outlet part.
As with the method and system according to the invention - contrary to the principles of which U.S. 5 016 710 is based, gas shall not leak into the formation for stimulation purposes, injection wells according to the invention extending through permeable formations, are lined and fluid- tight to surrounding formation.

Claims

C l a i m s
1. A method to increase the recovery rate in at least one (14) of two or more adjacent petroleum wells (12, 14) in which the reservoir pressure has become too low to bring recovered petroleum up to a surface position, and wherein gas is injected into said petroleum well (14) for that purpose, c h a r a c t e r i z e d i n that a first well (12) of said petroleum wells (12, 14) is plugged (at 16) above the reservoir, whereafter, above the plug (16) , from said first well (12) , an injection well (18) is drilled and connected to a second well (14) of said petroleum wells (12, 14), and that, after an injection well connection (18) has been established between the first and second petroleum wells (12, 14) , gas is injected from a surface position down through the first petroleum well (12) to above the plugged well portion (16) , further through the injection well (18) and into said second petroleum well (14) , in order to there create a gas lift, as known per se.
2. A method to increase the recovery rate in a plurality of adjacent petroleum wells (20, 22, 24, 26) in which the reservoir pressure has become too low, and where gas is injected into said petroleum wells (22, 24, 26) for that purpose, c h a r a c t e r i z e d i n that, from a template ( 20) on the seabed (HB) , a gas distributing station is established for gas supplied from a surface position, from platform (10) , ship or other surface installation, and that, from the template (28), an injection well (30, 32, 34) is drilled for connection to each of the adjacent underwater wells (22, 24, 26) in which the petroleum recovery rate is desired increased, and that gas is injected into respective underwater wells (22, 24, 26) through the injection well (30, 32, 34) belonging thereto.
3. A system for increasing recovery rate in one of two or more adjacent petroleum wells (12, 14), a first petroleum well (12) and a second petroleum well (14), and where, for the purpose of favouring the petroleum recovery thereof, pressurized gaseous fluid is supplied to e.g. said second petroleum well (14) , in order to create a gas lift therein, for carrying out the method as set forth in claim 1, c h a r a c t e r i z e d b y an injection well (18) extending from one (the first) petroleum well (12) , from a point above a plug (16) placed therein, said plug (16) being positioned above the reservoir, to another (the second) petroleum well (14), and that the injection well (18,18') in permeable formation is lined and fluid-tight to the surrounding formation.
4. A system as set forth in claim 3, c h a r a c t e r i z e d i n that each injection well (18) , at the outlet end (e.g. 18') thereof, has an upwardly directed course.
5. A system as set forth in claim 3 or 4 , c h a r a c t e r i z e d i n that each injection well's (18) inlet end has a downwardly directed course.
6. A system as set forth in claims 3 and 5, c h a r a c t e r i z e d i n that each injection well (18) has a substantially concavely U-shaped course.
PCT/NO1998/000165 1997-06-11 1998-06-04 A method and a system for improving the utilization of oil deposits from an underwater well at low reservoir pressure WO1998057032A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80411/98A AU8041198A (en) 1997-06-11 1998-06-04 A method and a system for improving the utilization of oil deposits from an underwater well at low reservoir pressure

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO972673A NO305719B1 (en) 1997-06-11 1997-06-11 Process and system for increasing recovery rate in one of two existing, nearby petroleum wells
NO972673 1997-06-11

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WO1998057032A1 true WO1998057032A1 (en) 1998-12-17

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010016767A2 (en) * 2008-08-08 2010-02-11 Ziebel As Subsurface reservoir drainage system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072242A (en) * 1980-03-24 1981-09-30 Vann R R Contonuous borehole formed horizontally through a hydrocarbon producing formation
US4390067A (en) * 1981-04-06 1983-06-28 Exxon Production Research Co. Method of treating reservoirs containing very viscous crude oil or bitumen
US5016710A (en) * 1986-06-26 1991-05-21 Institut Francais Du Petrole Method of assisted production of an effluent to be produced contained in a geological formation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2072242A (en) * 1980-03-24 1981-09-30 Vann R R Contonuous borehole formed horizontally through a hydrocarbon producing formation
US4390067A (en) * 1981-04-06 1983-06-28 Exxon Production Research Co. Method of treating reservoirs containing very viscous crude oil or bitumen
US5016710A (en) * 1986-06-26 1991-05-21 Institut Francais Du Petrole Method of assisted production of an effluent to be produced contained in a geological formation

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010016767A2 (en) * 2008-08-08 2010-02-11 Ziebel As Subsurface reservoir drainage system
WO2010016767A3 (en) * 2008-08-08 2010-11-11 Ziebel As Subsurface reservoir drainage system

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Publication number Publication date
AU8041198A (en) 1998-12-30
NO972673L (en) 1998-12-14
NO305719B1 (en) 1999-07-12
NO972673D0 (en) 1997-06-11

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