EP0306407B1 - Dispositif d'injection d'additifs inhibiteurs de corrosion ou de dépôts dans un puits géothermal d'exhaure - Google Patents

Dispositif d'injection d'additifs inhibiteurs de corrosion ou de dépôts dans un puits géothermal d'exhaure Download PDF

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Publication number
EP0306407B1
EP0306407B1 EP88402197A EP88402197A EP0306407B1 EP 0306407 B1 EP0306407 B1 EP 0306407B1 EP 88402197 A EP88402197 A EP 88402197A EP 88402197 A EP88402197 A EP 88402197A EP 0306407 B1 EP0306407 B1 EP 0306407B1
Authority
EP
European Patent Office
Prior art keywords
injection tube
well
injection
tube
fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP88402197A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0306407A1 (fr
Inventor
Olivier Goyeneche
Gilbert Martin
Gérard Longin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
FRANCAISE POUR LE DEVELOPPEMENT de la GEOTHERMIE ET DES ENERGIES NOUVELLES Cie SA
Original Assignee
FRANCAISE POUR LE DEVELOPPEMENT de la GEOTHERMIE ET DES ENERGIES NOUVELLES Cie SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by FRANCAISE POUR LE DEVELOPPEMENT de la GEOTHERMIE ET DES ENERGIES NOUVELLES Cie SA filed Critical FRANCAISE POUR LE DEVELOPPEMENT de la GEOTHERMIE ET DES ENERGIES NOUVELLES Cie SA
Priority to AT88402197T priority Critical patent/ATE74998T1/de
Publication of EP0306407A1 publication Critical patent/EP0306407A1/fr
Application granted granted Critical
Publication of EP0306407B1 publication Critical patent/EP0306407B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
    • E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells

Definitions

  • the present invention relates to a device for injecting additives that inhibit corrosion or deposit in a geothermal dewatering well.
  • the present invention aims to provide an injection device for treating all the casing from the reservoir, that is to say at the bottom of the well, thereby allowing protection of all of the works and better control of the phenomena.
  • this device for injecting additives that inhibit corrosion or deposits in a geothermal dewatering well, in which the dewatering of the geothermal fluid is ensured by a submerged pumping unit, lowered into the well, comprising a tube injection suspended in the casing of the well, opening at its lower end near the bottom of the well and being connected by a flexible hose to a source of additive located on the surface, is characterized in that the tube d injection, of composite material of the glass-resin type, is fixed to a hooking device mounted under the pumping group and to which is connected the flexible pipe extending to the source of additive on the surface, this device 'hooking comprising holes establishing communication between the upper end of the injection tube and the lower end of the flexible pipe.
  • Figure 1 is a vertical axial sectional view of a corrosion inhibitor additive injection device at the bottom of a geothermal well according to the invention.
  • Figure 2 is a vertical axial sectional view, on a larger scale, of a device for connecting the injection tube under the pumping unit.
  • Figure 3 is a vertical axial sectional view of a centering device during descent of the injection tube.
  • Figure 4 is an axial sectional view of an alternative embodiment of the device for connecting the injection tube under the pumping unit.
  • Figure 5 is an axial sectional view of an alternative embodiment of the injection head at the bottom of the well.
  • the device shown in Figure 1 is placed inside the casing 1 of a geothermal well.
  • the injection device itself is fixed to the lower part of a submerged pumping unit 2 suspended from a flange 3 placed at the upper end of the casing 1 of the well.
  • the production pumping unit 2 may include a submerged pump 4 rotated by an electric motor 5 located under the pump, a turbopump or even a long shaft pump with a surface drive motor.
  • the pump 4 is connected to the surface by a dewatering tube 6.
  • the injection device according to the invention which is installed in the production well, comprises a vertical injection tube 7 which extends from the depth chosen injection system, near the bottom of the well, to the lower end of the submerged motor pump group 4, 5, a device 8 for attaching the injection tube 7 to the engine 5 and a flexible connecting pipe 9 which extends between the upper end of the injection tube and the flange 3 for suspending the pumping group 2.
  • This flexible hose 9 is connected to a source of additive on the surface.
  • the injection tube 7 passes through a positive centering device 11 which guides the injection tube through the various reductions or casing 1 of the well, during the descent of the injection tube 7 into the well.
  • This centering device 11 comprises a vertical sleeve 12 through which the injection tube passes, with a certain radial clearance.
  • the bore of this sleeve is flared outward at its two ends and this sleeve 12 is extended outward by radial wings 13.
  • the centering device 11 is retained axially on the tube 7 by a crown 14 fixed to the lower part of the injection tube 7.
  • the lower end tube section of the injection tube which is open at its lower front end, is also preferably perforated over a part of its length so as to allow good distribution of the additive injected into the geothermal fluid, even if the end of the injection tube 7 becomes blocked.
  • the injection tube 7 consists of a succession of tubular sections assembled with each other by screwing.
  • Each tubular section is made of a composite material formed from glass fibers and a bonding resin between the fibers.
  • the resin which is particularly suitable for the present use is a furan resin produced by the resinification of furfuric alcohol in the presence of a catalyst acid, generally with addition of heat, until the degree of desired polymerization is achieved.
  • the characteristic properties of composite materials of the glass fiber-furan resin type are physical properties equivalent to those of polyester resin composites resistant to corrosion, offline resistance to corrosion against solvents (aliphatic, aromatic, chlorinated hydrocarbons) but also good resistance under acidic and alkaline conditions, and good heat resistance.
  • the outer surface of the tube 7 is covered with a film of pure waterproof resin.
  • this film of pure furan resin also covers the ends and the threaded parts by machining in the mass which serve for the connection of the tubular sections.
  • the tube 7 also advantageously comprises an inner coating consisting of a film of pure furan resin waterproof.
  • the winding angle of the glass fibers relative to the axis of the tube must be chosen according to the mechanical characteristics desired for the tube sections.
  • the device 8 for hooking the upper end of the injection tube 7 to the submerged motor 5 comprises, as shown in FIG. 2, a block 15 provided, at its upper part, a transverse flange 16 which is pierced with holes through which screws 17 are screwed into the underside of the motor 5, to secure the attachment device 8 under the motor 5.
  • the block 15 has, in its lower face, a central boss 18 ending in a male thread 19 on which is screwed the tapped upper end of the injection tube 7.
  • a blind axial bore 21 extends vertically in the block 15, opening into the lower front face of the boss 18; this vertical bore 21 communicates with a horizontal and radial bore 22 opening, by a recess 23, into the lateral surface of the block 15.
  • This recess 23 forms a stitching for fixing the lower end of the flexible pipe 9 extending up to on the surface.
  • the flexible pipe 9 provides the hydraulic connection between the upper end of the injection tube 7 and the injection metering pump (not shown) located on the ground surface. To this end, the flexible pipe 9 has, at its two ends, hydraulic connections allowing them to be fixed to a nozzle fitted on the suspension flange 3 of the dewatering column and to the nozzle 23 provided in the block 15 fixed to the motor 5.
  • the flexible pipe 9 is made of a synthetic material suitable for the geothermal fluid and the various additives chosen. It is delivered to the production site wound on a reel.
  • the device for hanging the injection tube 7 is made in two parts, namely an upper base 24 fixed under the engine 5 and a lower lifting head 25
  • the upper base 24 has an upper flange by which is fixed to the motor 5, by means of screws, and from which extend downwards two parallel vertical wings 24a, 24b forming a yoke.
  • the lifting head 25 is pierced with a conduit axial blind 26 opening in its face lower and which communicates with a lateral recess 27 forming a nozzle for the connection of the flexible pipe 9.
  • FIG. 5 represents an alternative embodiment of the injection head 28 fixed to the lower end of the injection tube 7.
  • This injection head 28 has a conical lower end part 28a, with rounded end, and, in its upper part, a conical tapping 28b ensuring connection to the injection tube 7.
  • a conical tapping 28b In the central part of the tapping 28b opens an axial blind pipe 29 which communicates, at its lower part, with several horizontal and radial holes 31 which open at the outside and which ensure the exit of the additive.
  • the injection device according to the invention is installed using cranes or drilling masts used during maintenance operations (raising and lowering of pump units submerged in dewatering), these devices need not be modified.
  • the device 8 for attaching the injection tube 7 is first screwed onto the upper end of the upper tubular section of this tube 7. It is then fixed to the lower front face of the engine 5, for example by bolting by means screws 17.
  • the flexible injection pipe 9 is then fixed to the hooking device 8 at the location of the nozzle 23.
  • the next operation consists of a conventional installation of the submerged motor pump group during which the flexible pipe 9 is unwound from its drum and is fixed against the production column, together with the electric power supply cable of the motor 5, by means of collars.
  • the upper end of the flexible pipe 9 is finally connected to the metering pump through the lower flange of the well head 3.
  • the passage thus formed is equipped with a tap ensuring sealing. This connection is made after placing the wellhead at the upper end of the production column.

Landscapes

  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Physics & Mathematics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Catching Or Destruction (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Processing Of Solid Wastes (AREA)
EP88402197A 1987-08-31 1988-08-31 Dispositif d'injection d'additifs inhibiteurs de corrosion ou de dépôts dans un puits géothermal d'exhaure Expired - Lifetime EP0306407B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88402197T ATE74998T1 (de) 1987-08-31 1988-08-31 Vorrichtung zur injektion von korrosions- oder ablagerungsinhibitoren in einer geothermalen bohrung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8712086A FR2619851B1 (fr) 1987-08-31 1987-08-31 Dispositif d'injection d'additifs inhibiteurs de corrosion ou de depots dans un puits geothermal d'exhaure
FR8712086 1987-08-31

Publications (2)

Publication Number Publication Date
EP0306407A1 EP0306407A1 (fr) 1989-03-08
EP0306407B1 true EP0306407B1 (fr) 1992-04-15

Family

ID=9354511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88402197A Expired - Lifetime EP0306407B1 (fr) 1987-08-31 1988-08-31 Dispositif d'injection d'additifs inhibiteurs de corrosion ou de dépôts dans un puits géothermal d'exhaure

Country Status (7)

Country Link
EP (1) EP0306407B1 (enExample)
AT (1) ATE74998T1 (enExample)
DE (1) DE3870106D1 (enExample)
ES (1) ES2032583T3 (enExample)
FR (1) FR2619851B1 (enExample)
GR (1) GR3005117T3 (enExample)
TR (1) TR23422A (enExample)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109372473B (zh) * 2018-12-01 2020-11-24 湖南达道新能源开发有限公司 一种能够严防腐蚀和环境污染的深部地热钻井
CN118602472B (zh) * 2024-08-07 2024-10-22 中石化绿源地热能(山东)开发有限公司 一种防腐地热井供暖设备

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580634A (en) * 1984-03-20 1986-04-08 Chevron Research Company Method and apparatus for distributing fluids within a subterranean wellbore
US4625803A (en) * 1985-05-20 1986-12-02 Shell Western E&P Inc. Method and apparatus for injecting well treating liquid into the bottom of a reservoir interval

Also Published As

Publication number Publication date
DE3870106D1 (de) 1992-05-21
FR2619851A1 (fr) 1989-03-03
GR3005117T3 (enExample) 1993-05-24
TR23422A (tr) 1989-12-29
EP0306407A1 (fr) 1989-03-08
FR2619851B1 (fr) 1990-01-12
ATE74998T1 (de) 1992-05-15
ES2032583T3 (es) 1993-02-16

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