EP3546694B1 - Device and method for collecting debris of deposits in a wellbore - Google Patents
Device and method for collecting debris of deposits in a wellbore Download PDFInfo
- Publication number
- EP3546694B1 EP3546694B1 EP18164037.6A EP18164037A EP3546694B1 EP 3546694 B1 EP3546694 B1 EP 3546694B1 EP 18164037 A EP18164037 A EP 18164037A EP 3546694 B1 EP3546694 B1 EP 3546694B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- debris
- wellbore
- deposits
- assembly
- storing module
- 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.)
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Links
- 238000000034 method Methods 0.000 title claims description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 22
- 239000007789 gas Substances 0.000 claims description 14
- 239000012530 fluid Substances 0.000 claims description 9
- 238000011084 recovery Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 description 11
- 239000007788 liquid Substances 0.000 description 11
- 238000011282 treatment Methods 0.000 description 9
- 238000003860 storage Methods 0.000 description 6
- 230000035939 shock Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 241000282887 Suidae Species 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
Images
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
- E21B27/00—Containers for collecting or depositing substances in boreholes or wells, e.g. bailers, baskets or buckets for collecting mud or sand; Drill bits with means for collecting substances, e.g. valve drill bits
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
Definitions
- the field of the invention relates to well boring and, more particularly, to a device and a method for removing deposits from a wellbore wall or an equipment arranged in a wellbore of a subterranean formation in order to improve the recovery of formation fluids and/or gases.
- the device and method according to the invention may advantageously be used to remove deposits from e.g. a wellbore wall, a casing, a tubing or a well completion equipment.
- a borehole is drilled into the earth through an oil or gas producing subterranean formation or, for some purposes, through a water bearing formation or a formation into which water or gas or other liquids are to be injected.
- Completion of a well may be carried out in a number of ways dependent upon the nature of the formation of interest.
- a casing into the wellbore to control formation elements.
- the casing is then perforated in a plurality of areas for allowing the passage of oil and/or gas from the formation into the casing.
- completion strings are arranged in the borehole.
- Such a completion string generally comes as a production tubing which comprises a plurality of different equipment such as e.g. safety valves, sliding side doors, side pocket mandrels, etc.
- deposits can cause significant problems, because of their composition and the fact that they can precipitate under certain conditions (pressure, temperature, composition).
- These materials of mineral or organic origins either together with chemicals from water, normally produced with the oil, such as calcium carbonate, calcium sulfate, barium sulfate, sulfur and the like, or such chemicals themselves have a tendency to form extremely hard deposits on the wellbore wall and/or different parts of wellbore equipment.
- Such deposits can thus adhere to the wellbore wall and/or various equipment arranged in a borehole or a pipeline, restricting their use seriously and/or reducing or completely preventing the flow of fluids or gases through the completion string or the pipeline. For example, deposits may prevent opening or closing safety valves or sliding side doors, etc.
- Such deposits are difficult to dissolve by known chemical means or to dislodge by known mechanical means.
- chemical treatments such as, treatments with acids, surface active agents and the like have been utilized in order to clean out scaled wellbore wall or equipment.
- Such techniques while less expensive than a complete workover, are substantially less effective, since they are incapable, in most cases, of dissolving significant amounts of the plugging materials.
- Another technique which can be classified as a mechanical technique and has also been suggested for the purpose of cleaning wellbore equipment, includes using brushes, scrapers or pigs. Such technique allows only removing most of the encrusted deposits in areas of the wellbore equipment which are easily accessible.
- brushes, scrapers or pigs are quite inefficient removing encrusted deposits in areas of the wellbore equipment accessible with difficulty or inaccessible. Consequently, it is often necessary to rework the well and replace one or several equipment of the completion string or the pipeline. Such tactics are, of course, both time-consuming and expensive.
- the electrical discharge generating device comprises electrodes in between which a high-voltage current is discharged.
- the discharge of said high-voltage current generates high-energy shock waves that transmit in the borehole toward a well completion equipment and/or a tubing and/or a casing, the wellbore wall and the subterranean formation.
- the present invention concerns an assembly according to claim 1.
- the collecting device allows collecting debris falling by gravity when deposits are removed (i.e. cleaned) from a wellbore wall and/or an equipment arranged in a wellbore. Thus, the collecting device allows thus avoiding debris to fall into the wellbore and block said wellbore and/or some wellbore equipment.
- the device also allows extracting quickly deposits from a wellbore.
- the deflector comprises a tubular portion comprising a first end connected to the debris storing module and a second end configured for collecting debris, said tubular portion being adapted to convey debris from said second end into the debris storing module through said first end.
- the deflector comprises a connecting shaft mounted on the second end of the tubular portion and configured for attaching the collecting device to a cleaning device.
- the deflector comprises at least one annular portion extending from the second end of the tubular portion.
- the at least one annular portion extends radially from the second end of the tubular portion.
- the at least one annular portion is flexible or pliable. This allows said at least one annular portion to abut against the surface to be cleaned, for example a casing or the wellbore wall, in order to avoid debris falling between said surface and the deflector into the wellbore.
- the deflector comprises three annular portions extending from the second end of the tubular portion.
- the debris storing module comprises at least one tubular section configured for storing debris.
- the debris storing module comprises a plurality of tubular sections connected together along a same longitudinal axis.
- each tubular section comprises a plurality of slots for evacuating liquids and/or gases from the inner part of the debris storing module.
- the collecting device further comprises an unloading plug connected to the debris storing module and being configured for switching between a first position in which the unloading plug prevents the debris stored in the debris storing module to leave said debris storing module and a second position in which the unloading plug allows the debris stored in the debris storing module to leave said debris storing module.
- the unloading plug comprises a trap door allowing the unloading plug to switch (i.e. move) between the first position and the second position (and vice-and-versa).
- the trap door is removable to easily evacuate debris stored in the debris storing module.
- the unloading plug comprises a tubular portion delimiting an internal opening, the trap door being configured to be moved between a blocking position, in which the trap door obstructs said internal opening, and a free position in which debris stored into the debris storing module may flow though said internal opening to unload the said debris storing module.
- an assembly for removing deposits from a wellbore wall or an equipment arranged in a wellbore of a subterranean formation and for collecting debris of said deposits, said assembly comprising a cleaning device configured for removing deposits from said wellbore wall or said equipment and a collecting device as previously presented, said collecting device being attached below said cleaning device in order to collect debris from deposits removed by the cleaning device.
- the cleaning device and the collecting device extend along a same longitudinal axis in order to ease the use of the assembly in the wellbore, in particular to insert or withdraw the assembly from the wellbore.
- the invention also relates to a method for collecting debris of deposits in a wellbore of a subterranean formation in order to improve the recovery of formation fluids and/or gases, method according to claim 12.
- the collecting step comprises deflecting the debris so that said debris are received by the second end of the tubular portion of the deflector, conveying the debris from the second end of the deflector to the debris storage module through said tubular portion of the deflector and storing the debris into the debris storage module.
- the unloading step comprises opening or removing a trap door to open the unloading plug and unload the collecting device.
- the invention is described hereunder in reference to a well for producing formation fluids or gases such as e.g. oil. This does not limit the scope of the present invention which may be used with any type of formation.
- FIGURE 1 shows a subterranean formation 1 comprising a treatment zone 3.
- a treatment zone 3 may be made of rock.
- the treatment zone 3 may comprise a porous zone that constitutes a reservoir of hydrocarbons, such as oil or gas.
- the porous zone is accessible through a wellbore 5 extending from the surface through to the treatment zone 3.
- the treatment zone 3 interfaces with the wellbore 5 at wellbore wall 5A and extends radially from wellbore 5.
- a wellbore equipment constituted of a metallic casing 7 is arranged in the wellbore 5.
- This casing 7 may comprise perforations that allow creating some flow paths within the treatment zone 3 adjacent to the wellbore 5.
- the wellbore equipment could be for example a completion string equipment, a production tubing element or any type of equipment arranged in the wellbore 5.
- an electrical discharge generating device 10 is arranged in the wellbore 5.
- the electrical discharge generating device 10 is configured for generating electrical discharges that propagate shock waves 11 ( FIGURE 12 ), in particular for cleaning the casing 7 in order to improve the recovery of formation fluids and/or gases.
- the electrical discharge generating device 10 constitutes a source of electrohydraulic energy that can be arranged into the wellbore 5 near (i.e. next to) a part of the casing 7 that needs cleaning, in particular to remove deposits 8 stuck on or inside said casing 7 as shown on FIGURE 12 .
- an example of collecting device 20 is attached to the bottom end 10A of the electrical discharge generating device 10 in order to collect debris 8A of deposits 8 that are removed from the casing 7 by said electrical discharge generating device 10 as shown on FIGURE 12 .
- FIGURES 2 to 5 show an exemplary embodiment of a collecting device 20 according to the invention.
- the collecting device 20 according to the invention allows collecting debris 8A of deposits 8 while said deposits 8 are being removed from the casing 7 in order to improve the recovery of formation fluids and/or gases.
- the deflector 210 comprises a connecting shaft 214 extending from the second end 212B of the tubular portion 212 and comprising a free end 214A which is configured for attaching the collecting device 20 to the electrical discharge generating device 10.
- the free end 214A of the connecting shaft 214 may comprise a hollow central portion which allow inserting a rod (not shown) protruding from the bottom end 10A of the electrical discharge generating device 10.
- the dimensions of the slots 2200 are adapted to allow liquids that enter into the debris storing module 220 via the deflector 210 to be evacuated while debris 8A stored inside the first tubular section 220A, second tubular section 220B and/or third tubular section 220C remain inside the debris storing module 220.
- the adapter 215 comprises a plurality of pins 215C ( FIGURE 7 ) which are configured to fit into corresponding plurality of holes (not visible) forms onto the end 220A1 of the first tubular section 220A.
- the adapter 215 also comprise two grooved portions 215D formed on opposite parts of the side wall of the adapter 215 for carrying the collecting device 20 with a lifting tool such as e.g. a crane or a forklift.
- the collecting device 20 also comprises a first section connector 221-1 and a second section connector 221-2.
- the first section connector 221-1 allows connecting the first tubular section 220A and the second tubular section 220B.
- the second section connector 221-2 allows connecting the second tubular section 220B and the third tubular section 220C.
- the unloading plug 230 is connected to the debris storing module 220 and is configured to be placed in a first configuration, in which the unloading plug 230 prevents the debris 8A stored in the debris storing module 220 to leave said debris storing module 220, and a second configuration, in which the unloading plug 230 allows the debris 8A stored in the debris storing module 220 to leave said debris storing module 220.
- the unloading plug 230 comprises a connecting end 231A, a tubular portion 231 delimiting an internal opening 232, a free end 231B and a trap door 235.
- the connecting end 231A comprises pins 233 protruding from said connecting end 231A, which are configured to engage with holes formed in the end 220C1 of the third tubular section 220C in order to fix the unloading plug 230 on the third tubular section 220C by clipping.
- the tubular portion 231 comprises a slot 234 formed in the side wall of said tubular portion 231, which is configured for receiving the trap door 235.
- the trap door 235 when the trap door 235 is mounted in the slot 234 of the tubular portion 231, in a position called blocking position, the trap door 235 obstruct entirely the internal opening 232 of the tubular portion 231 to prevent the debris 8A from leaving the debris storing module 220 (first configuration of the unloading plug 230).
- the internal opening 232 of the tubular portion 231 allows debris 8A to leave the debris storing module 220 to empty said debris storing module 220 from debris 8A (second configuration of the unloading plug 230).
- the electrical discharge generating device 10 When the electrical discharge generating device 10 is arranged near a portion of the casing 7 which needs to be cleaned from deposits 8, the electrical discharge generating device 10 is activated to generate electrical discharges that propagate shock waves 11 to remove deposits 8 from the casing 7 internal wall in a step S2.
- the assembly 300 formed of the electrical discharge generating device 10 and the collecting device 20 may then be moved toward another portion of the casing 7 that needs to be cleaned from deposits 8.
- the assembly 300 may be pulled out of the wellbore 5 and the trap door 235 may be open, by removing screw 236, to unload debris 8A stored in the debris storing module 220 in a step S5.
Description
- The field of the invention relates to well boring and, more particularly, to a device and a method for removing deposits from a wellbore wall or an equipment arranged in a wellbore of a subterranean formation in order to improve the recovery of formation fluids and/or gases. The device and method according to the invention may advantageously be used to remove deposits from e.g. a wellbore wall, a casing, a tubing or a well completion equipment.
- In the art of well boring, a borehole is drilled into the earth through an oil or gas producing subterranean formation or, for some purposes, through a water bearing formation or a formation into which water or gas or other liquids are to be injected.
- Completion of a well may be carried out in a number of ways dependent upon the nature of the formation of interest. In particular, it is known to arrange a casing into the wellbore to control formation elements. Once installed into the wellbore, the casing is then perforated in a plurality of areas for allowing the passage of oil and/or gas from the formation into the casing. In order to produce formation fluids or gases, completion strings are arranged in the borehole. Such a completion string generally comes as a production tubing which comprises a plurality of different equipment such as e.g. safety valves, sliding side doors, side pocket mandrels, etc.
- In any event, after a period of production, injection or transportation of fluids or gases, there is a tendency for the wellbore wall and/or different wellbore equipment to become plugged with various types of deposits like e.g. residues. For example, organic residues like scale, paraffin, asphalts and other gummy residues of petroleum origin often cause plugging problems.
- Usually these deposits can cause significant problems, because of their composition and the fact that they can precipitate under certain conditions (pressure, temperature, composition). These materials of mineral or organic origins either together with chemicals from water, normally produced with the oil, such as calcium carbonate, calcium sulfate, barium sulfate, sulfur and the like, or such chemicals themselves have a tendency to form extremely hard deposits on the wellbore wall and/or different parts of wellbore equipment. Such deposits can thus adhere to the wellbore wall and/or various equipment arranged in a borehole or a pipeline, restricting their use seriously and/or reducing or completely preventing the flow of fluids or gases through the completion string or the pipeline. For example, deposits may prevent opening or closing safety valves or sliding side doors, etc.
- Such deposits are difficult to dissolve by known chemical means or to dislodge by known mechanical means. For example, chemical treatments, such as, treatments with acids, surface active agents and the like have been utilized in order to clean out scaled wellbore wall or equipment. However, such techniques, while less expensive than a complete workover, are substantially less effective, since they are incapable, in most cases, of dissolving significant amounts of the plugging materials. Another technique, which can be classified as a mechanical technique and has also been suggested for the purpose of cleaning wellbore equipment, includes using brushes, scrapers or pigs. Such technique allows only removing most of the encrusted deposits in areas of the wellbore equipment which are easily accessible. However, brushes, scrapers or pigs are quite inefficient removing encrusted deposits in areas of the wellbore equipment accessible with difficulty or inaccessible. Consequently, it is often necessary to rework the well and replace one or several equipment of the completion string or the pipeline. Such tactics are, of course, both time-consuming and expensive.
- Another method used for removing deposits consists in using an electrical discharge generating device which generates shock waves for creating an electrohydraulic effect. More precisely, in an existing solution, the electrical discharge generating device comprises electrodes in between which a high-voltage current is discharged. The discharge of said high-voltage current generates high-energy shock waves that transmit in the borehole toward a well completion equipment and/or a tubing and/or a casing, the wellbore wall and the subterranean formation.
- When deposits are removed for an equipment or a wellbore wall using these methods, the deposits fall in the wellbore and may block said wellbore or equipment, therefore reducing or preventing the efficiency of oil recovery.
GB 2 499 953 A US 6 745 839 B disclose prior art assemblies of a cleaning device and a collecting device. - It is therefore an object of the present invention to provide a device and method for avoiding blocking a wellbore or a wellbore equipment with debris of deposits removed from the wellbore wall and/or a wellbore equipment.
- To this end, the present invention concerns an assembly according to
claim 1. - The collecting device allows collecting debris falling by gravity when deposits are removed (i.e. cleaned) from a wellbore wall and/or an equipment arranged in a wellbore. Thus, the collecting device allows thus avoiding debris to fall into the wellbore and block said wellbore and/or some wellbore equipment. The device also allows extracting quickly deposits from a wellbore.
- According to the invention, the deflector comprises a tubular portion comprising a first end connected to the debris storing module and a second end configured for collecting debris, said tubular portion being adapted to convey debris from said second end into the debris storing module through said first end.
- According to the invention, the deflector comprises a connecting shaft mounted on the second end of the tubular portion and configured for attaching the collecting device to a cleaning device.
- Preferably, the deflector comprises at least one annular portion extending from the second end of the tubular portion.
- In an embodiment, the at least one annular portion extends radially from the second end of the tubular portion.
- Preferably, the at least one annular portion is flexible or pliable. This allows said at least one annular portion to abut against the surface to be cleaned, for example a casing or the wellbore wall, in order to avoid debris falling between said surface and the deflector into the wellbore.
- In an embodiment, the deflector comprises three annular portions extending from the second end of the tubular portion.
- Advantageously, the debris storing module comprises at least one tubular section configured for storing debris.
- In an embodiment, the debris storing module comprises a plurality of tubular sections connected together along a same longitudinal axis.
- Advantageously, each tubular section comprises a plurality of slots for evacuating liquids and/or gases from the inner part of the debris storing module.
- In an embodiment, the collecting device further comprises an unloading plug connected to the debris storing module and being configured for switching between a first position in which the unloading plug prevents the debris stored in the debris storing module to leave said debris storing module and a second position in which the unloading plug allows the debris stored in the debris storing module to leave said debris storing module.
- According to an aspect of the invention, the unloading plug comprises a trap door allowing the unloading plug to switch (i.e. move) between the first position and the second position (and vice-and-versa).
- Advantageously, the trap door is removable to easily evacuate debris stored in the debris storing module.
- In a preferred embodiment, the unloading plug comprises a tubular portion delimiting an internal opening, the trap door being configured to be moved between a blocking position, in which the trap door obstructs said internal opening, and a free position in which debris stored into the debris storing module may flow though said internal opening to unload the said debris storing module.
- Also disclosed is an assembly for removing deposits from a wellbore wall or an equipment arranged in a wellbore of a subterranean formation and for collecting debris of said deposits, said assembly comprising a cleaning device configured for removing deposits from said wellbore wall or said equipment and a collecting device as previously presented, said collecting device being attached below said cleaning device in order to collect debris from deposits removed by the cleaning device.
- The cleaning device and the collecting device extend along a same longitudinal axis in order to ease the use of the assembly in the wellbore, in particular to insert or withdraw the assembly from the wellbore.
- The invention also relates to a method for collecting debris of deposits in a wellbore of a subterranean formation in order to improve the recovery of formation fluids and/or gases, method according to
claim 12. - Advantageously, the collecting step comprises deflecting the debris so that said debris are received by the second end of the tubular portion of the deflector, conveying the debris from the second end of the deflector to the debris storage module through said tubular portion of the deflector and storing the debris into the debris storage module.
- In an embodiment, the method further comprises a step of unloading the debris stored in the debris storage module.
- In a preferred embodiment, the unloading step comprises opening or removing a trap door to open the unloading plug and unload the collecting device.
- These and other features, aspects, and advantages of the present invention are better understood with regard to the following Detailed Description of the Preferred Embodiments, appended Claims, and accompanying Figures, where:
-
FIGURE 1 schematically illustrates a cross-sectional view of a wellbore comprising a casing in which is arranged an embodiment of an assembly according to the invention; -
FIGURE 2 schematically illustrates a side view of an embodiment of a collecting device according to the invention; -
FIGURE 3 schematically illustrates a perspective view of the collecting device ofFIGURE 2 ; -
FIGURE 4 schematically illustrates another perspective view of the collecting device ofFIGURE 2 ; -
FIGURE 5 schematically illustrates a partial exploded view of the collecting device ofFIGURE 2 ; -
FIGURE 6 schematically illustrates a perspective view of the deflector of the collecting device ofFIGURE 2 ; -
FIGURE 7 schematically illustrates a perspective view of the adapter of the collecting device ofFIGURE 2 ; -
FIGURE 8 schematically illustrates a perspective view of a section connector of the collecting device ofFIGURE 2 ; -
FIGURE 9 schematically illustrates a perspective view of the unloading plug of the collecting device ofFIGURE 2 ; -
FIGURE 10 schematically illustrates a perspective view of the trap door of the unloading plug of the collecting device ofFIGURE 2 ; -
FIGURE 11 schematically illustrates a cross-sectional view of the unloading plug ofFIGURE 9 , the trap door ofFIGURE 10 being mounted on said unloading plug; -
FIGURE 12 schematically illustrates a collection of debris using the collecting device ofFIGURE 2 ; -
FIGURE 13 schematically illustrates an exemplary embodiment of the method according to the invention. - In the accompanying Figures, similar components or features, or both, may have the same or a similar reference label.
- The invention is described hereunder in reference to a well for producing formation fluids or gases such as e.g. oil. This does not limit the scope of the present invention which may be used with any type of formation.
-
FIGURE 1 shows asubterranean formation 1 comprising atreatment zone 3. For example, such atreatment zone 3 may be made of rock. Thetreatment zone 3 may comprise a porous zone that constitutes a reservoir of hydrocarbons, such as oil or gas. The porous zone is accessible through awellbore 5 extending from the surface through to thetreatment zone 3. Thetreatment zone 3 interfaces with thewellbore 5 atwellbore wall 5A and extends radially fromwellbore 5. - In the example illustrated on
FIGURE 1 , a wellbore equipment constituted of ametallic casing 7 is arranged in thewellbore 5. Thiscasing 7 may comprise perforations that allow creating some flow paths within thetreatment zone 3 adjacent to thewellbore 5. In another embodiment, the wellbore equipment could be for example a completion string equipment, a production tubing element or any type of equipment arranged in thewellbore 5. - The
wellbore 5 may be partially filled with a liquid, called "wellbore liquid" 6 that reaches a givenwellbore liquid 6 level in such a manner that some parts of thecasing 7 are arranged above said wellbore liquid level (i.e. in a dry volume of the wellbore 5), whereas some parts of thecasing 7 are arranged under thewellbore liquid 6 level. Alternatively, thewellbore 5 could be completely dry (i.e. deprived of liquid). - As illustrated on
FIGURE 1 , an electricaldischarge generating device 10 is arranged in thewellbore 5. The electricaldischarge generating device 10 is configured for generating electrical discharges that propagate shock waves 11 (FIGURE 12 ), in particular for cleaning thecasing 7 in order to improve the recovery of formation fluids and/or gases. In this illustrated example, the electricaldischarge generating device 10 constitutes a source of electrohydraulic energy that can be arranged into thewellbore 5 near (i.e. next to) a part of thecasing 7 that needs cleaning, in particular to removedeposits 8 stuck on or inside saidcasing 7 as shown onFIGURE 12 . - The electrical
discharge generating device 10 is coupled to awireline 12 which is operable to raise and lower said electricaldischarge generating device 10 and to supply power from the surface to said electricaldischarge generating device 10. A voltage source (not shown) located external of thewellbore 5 and an electrical circuit (not shown) mounted within saidwireline 12 allow to connect said voltage source to the electricaldischarge generating device 10. Electrical power is supplied by the low voltage source at a steady and relatively low power from the surface through thewireline 12 to the downhole electricaldischarge generating device 10. - In this exemplary embodiment, the electrical
discharge generating device 10 has a substantially cylindrically shape and may comprises, as already described inUS patent 4,345,650 issued to Wesley orUS patent 6,227,293 issued to Huffman , - a power conversion unit, a power storage unit, a control unit and a discharge unit.
- As illustrated on
FIGURE 1 , an example of collectingdevice 20 according to the invention is attached to thebottom end 10A of the electricaldischarge generating device 10 in order to collectdebris 8A ofdeposits 8 that are removed from thecasing 7 by said electricaldischarge generating device 10 as shown onFIGURE 12 . -
FIGURES 2 to 5 show an exemplary embodiment of a collectingdevice 20 according to the invention. The collectingdevice 20 according to the invention allows collectingdebris 8A ofdeposits 8 while saiddeposits 8 are being removed from thecasing 7 in order to improve the recovery of formation fluids and/or gases. - In this example, as illustrated on
FIGURES 2 to 5 , the collectingdevice 20 is of cylindrical shape having a circular section and comprises a plurality of elements. The collectingdevice 20 comprises adeflector 210 and adebris storing module 220. - The
deflector 210 is configured for deflecting fallingdebris 8A ofdeposits 8 being removed from thecasing 7 by the electricaldischarge generating device 10. - In reference to
FIGURES 5 and 6 , thedeflector 210 comprises atubular portion 212 comprising afirst end 212A, adapted to be connected to thedebris storing module 220 via anadapter 215, and asecond end 212B configured for collectingdebris 8A. Thetubular portion 212 is adapted to conveydebris 8A from saidsecond end 212B through saidfirst end 212A into thedebris storing module 220. - The
deflector 210 comprises a connectingshaft 214 extending from thesecond end 212B of thetubular portion 212 and comprising afree end 214A which is configured for attaching the collectingdevice 20 to the electricaldischarge generating device 10. For example, thefree end 214A of the connectingshaft 214 may comprise a hollow central portion which allow inserting a rod (not shown) protruding from thebottom end 10A of the electricaldischarge generating device 10. - As illustrated on
FIGURE 6 , thesecond end 212B of thetubular portion 212 comprises an annular flange 212B1 from which extend threewings 213 and in which are formed threeopenings 213A delimited between saidwings 213. Thewings 213 allow reinforcing thedeflector 210 and guidingdebris 8A towardopenings 213A into thetubular portion 212. - In the example illustrated on
FIGURE 5 , thedeflector 210 comprises threeannular portion 216 mounted around the annular flange 212B1 and thesecond end 212B of thetubular portion 212. Theannular portion 216 aims thedebris 8A removed from thecasing 7 into the inner flow path ofopenings 213A of thedeflector 210. Theannular portions 216 are made with a pliable or flexible material such that contact is maintained between thedeflector 210 and thewellbore wall 5A or casing 7 (or deposits 8 - seefigure 12 ) so that all material is directed into theopenings 213A and collected by the collectingdevice 20. - As illustrated on
FIGURES 2 to 5 , thedebris storing module 220 comprises three tubular sections, namely a firsttubular section 220A, a secondtubular section 220B and a thirdtubular section 220C connected together along a same longitudinal axis X (FIGURES 2 and5 ). In another embodiment, thedebris storing module 220 could comprise more or less than three tubular sections. As illustrated onFIGURE 5 , each of the firsttubular section 220A, the secondtubular section 220B and the thirdtubular section 220C comprises a plurality ofslots 2200 which allow liquids that enter into thedebris storing module 220 via thedeflector 210 to be evacuated. More precisely, the dimensions of theslots 2200 are adapted to allow liquids that enter into thedebris storing module 220 via thedeflector 210 to be evacuated whiledebris 8A stored inside the firsttubular section 220A, secondtubular section 220B and/or thirdtubular section 220C remain inside thedebris storing module 220. - The
debris storing module 220 is configured to be connected to thedeflector 210 for storingdebris 8A deflected by saiddeflector 210. To this end, the collectingdevice 20 comprises anadapter 215, shown onFIGURE 7 , which allows connecting thefirst end 212A of thetubular portion 212 of thedeflector 210 to an end 220A1 of the firsttubular section 220A as shown onFIGURE 5 . In this example, theadapter 215 comprises afirst end 215A of tubular shape, adapted to receive thefirst end 212A of thetubular portion 212 of thedeflector 210, for example by clipping or press-fitting, and asecond end 215B, also of tubular shape but of a smaller diameter, and which is adapted to be inserted into the corresponding end 220A1 of the firsttubular section 220A. In order to fix the end 220A1 of the firsttubular section 220A to thesecond end 215B of theadapter 215, theadapter 215 comprises a plurality ofpins 215C (FIGURE 7 ) which are configured to fit into corresponding plurality of holes (not visible) forms onto the end 220A1 of the firsttubular section 220A. Theadapter 215 also comprise twogrooved portions 215D formed on opposite parts of the side wall of theadapter 215 for carrying the collectingdevice 20 with a lifting tool such as e.g. a crane or a forklift. - As shown on
FIGURE 5 , the collectingdevice 20 also comprises a first section connector 221-1 and a second section connector 221-2. The first section connector 221-1 allows connecting the firsttubular section 220A and the secondtubular section 220B. The second section connector 221-2 allows connecting the secondtubular section 220B and the thirdtubular section 220C. - As illustrated on
FIGURE 8 , asection connector 221, such as the first section connector 221-1 and the second section connector 221-2, has a tubular shape and comprises twoends tubular section 220A, the secondtubular section 220B and the thirdtubular section 220C. Thesection connector 221 is fixed to the firsttubular section 220A, secondtubular section 220B and thirdtubular section 220C by clipping usingpins 221C protruding from ends 221A, 221B of saidsection connector 221. - In this preferred embodiment, the collecting
device 20 further comprises an unloadingplug 230 that allows evacuating easily thedebris 8A stored in thedebris storage module 220, in particular when thedebris storage module 220 is full and/or when the collectingdevice 20 is pulled out of thewellbore 5. - To this end, the unloading
plug 230 is connected to thedebris storing module 220 and is configured to be placed in a first configuration, in which theunloading plug 230 prevents thedebris 8A stored in thedebris storing module 220 to leave saiddebris storing module 220, and a second configuration, in which theunloading plug 230 allows thedebris 8A stored in thedebris storing module 220 to leave saiddebris storing module 220. - In reference to
FIGURES 9 to 11 , the unloadingplug 230 comprises a connectingend 231A, atubular portion 231 delimiting aninternal opening 232, afree end 231B and atrap door 235. In the example illustrated onFIGURE 9 , the connectingend 231A comprisespins 233 protruding from said connectingend 231A, which are configured to engage with holes formed in the end 220C1 of the thirdtubular section 220C in order to fix theunloading plug 230 on the thirdtubular section 220C by clipping. As shown onFIGURE 11 , thetubular portion 231 comprises aslot 234 formed in the side wall of saidtubular portion 231, which is configured for receiving thetrap door 235. - The
trap door 235, illustrated onFIGURE 10 , may be mounted in a removable manner in theslot 234 of thetubular portion 231. In this exemplary embodiment, thetrap door 235 is a one-piece element comprising aplate portion 235A and aconnection portion 235B extending perpendicularly from saidplate portion 235A and which is configured for receiving a screw 236 (FIGURE 11 ) allowing fixing thetrap door 235 on thetubular portion 231. - Thus, when the
trap door 235 is mounted in theslot 234 of thetubular portion 231, in a position called blocking position, thetrap door 235 obstruct entirely theinternal opening 232 of thetubular portion 231 to prevent thedebris 8A from leaving the debris storing module 220 (first configuration of the unloading plug 230). - When the
trap door 235 is removed from theslot 234 of the tubular portion 231 (called free position), theinternal opening 232 of thetubular portion 231 allowsdebris 8A to leave thedebris storing module 220 to empty saiddebris storing module 220 fromdebris 8A (second configuration of the unloading plug 230). - An exemplary embodiment of the method according to the invention will now be described in reference to
FIGURE 13 . - In a step S1, the connecting
shaft 214 of the collectingdevice 20 is first attached to thebottom end 10A of the electricaldischarge generating device 10, extending along the same longitudinal axis X, to form anassembly 300 which is then lowered inside thecasing 7 down thewellbore 5 using thewireline 12. - When the electrical
discharge generating device 10 is arranged near a portion of thecasing 7 which needs to be cleaned fromdeposits 8, the electricaldischarge generating device 10 is activated to generate electrical discharges that propagateshock waves 11 to removedeposits 8 from thecasing 7 internal wall in a step S2. - When
debris 8A ofdeposits 8 being removed fall under the effect of gravity, thedeflector 210, and in particular theannular portions 216, deflect saiddebris 8A, in a step S3, toward theopenings 213A so that saiddebris 8A go through thetubular portion 212 up todebris storing module 220 where thedebris 8A are stored in a step S4. - The
assembly 300 formed of the electricaldischarge generating device 10 and the collectingdevice 20 may then be moved toward another portion of thecasing 7 that needs to be cleaned fromdeposits 8. - When the
debris storing module 220 is full or when thecasing 7 is clean fromdeposits 8 or when thedebris storing module 220 is full, theassembly 300 may be pulled out of thewellbore 5 and thetrap door 235 may be open, by removingscrew 236, to unloaddebris 8A stored in thedebris storing module 220 in a step S5. - According to the invention, the cleaning device is an electrical discharge generating device. In an another example, not part of the scope of the claims, the cleaning device could be any type of device adapted to remove the deposits for a
wellbore wall 5A or an equipment arranged in awellbore 5. - The assembly and method according to the invention allow therefore efficiently, rapidly and easily collect deposits that are removed from a wellbore wall and/or a wellbore equipment.
Table of references 1 subterranean formation 3 treatment zone 5 wellbore 6 wellbore liquid 67 casing 8 deposits 8A debris 10 electrical discharge generating device 10A bottom end 11 shock wave 12 wireline 20 collecting device 210 deflector 212 tubular portion 212A first end 212B second end 212B1 annular flange 213 wings 213A openings 214 connecting shaft 214A free end 215 adapter 215A first end 215B second end 215C pin 215D grooved portion 216 annular portion 220 debris storing module 2200 slot 220A first tubular section 220A1 end 220B second tubular section 220C third tubular section 220C1 end 221 section connector 221A end 221B end 221-1 first section connector 221-2 second section connector 221C pin 230 unloading plug 231 tubular portion 231A connecting end 231B free end 232 internal opening 233 pin 234 slot 235 trap door 235A plate portion 235B connection portion 236 screw 300 assembly
Claims (12)
- An assembly (300) for removing deposits (8) from a wellbore wall (5A) or from an equipment (7) arranged in a wellbore (5) of a subterranean formation (1) and for collecting debris (8A) of said deposits (8), said assembly (300) comprising an electrical discharge generating device (10) configured for removing deposits (8) from said wellbore wall (5A) or from said equipment (7) and a collecting device (20), said collecting device (20) comprising:- a deflector (210) configured for deflecting falling debris (8A) of deposits (8) while said deposits (8) are being removed from said wellbore wall (5A) or said wellbore equipment (7), and- a debris storing module (220) connected to said deflector (210), said debris storing module (220) being configured for collecting and storing debris (8A) deflected by said deflector (210),wherein the deflector (210) comprises:- a tubular portion (212) comprising a first end (212A) connected to the debris storing module (220) and a second end (212B) configured for collecting debris (8A), said tubular portion (212) being adapted to convey debris (8A) from said second end (212B) into the debris storing module (220) through said first end (212A), the second end (212B) of the tubular portion (212) comprising an annular flange (212B1) from which extend three wings (213) and in which are formed three openings (213A) delimited between said wings (213),- a connecting shaft (214) mounted on the annular flange (212B1) of the second end (212B) of the tubular portion (212) via the wings (213) and attached to the bottom of the electrical discharge generating device (10) so that the collecting device (20) lays under the electrical discharge generating device (10) to collect debris (8A) of deposits (8) falling by gravity into the deflector (210) while said deposits (8) are being removed from the wellbore wall (5A) or the equipment (7) arranged in the wellbore (5).
- The assembly (300) according to claim 1, wherein the deflector (210) comprises at least one annular portion (216) extending from the second end (212B) of the tubular portion (212).
- The assembly (300) according to any of the preceding claims, wherein the debris storing module (220) comprises at least one tubular section (220A, 220B, 220C) configured for storing debris (8A).
- The assembly (300) according to claim 3, wherein the debris storing module (220) comprises a plurality of tubular sections (220A, 220B, 220C) connected together along a same longitudinal axis (X).
- The assembly (300) according to any of claim 3 or 4, wherein each tubular section (220A, 220B, 220C) comprises a plurality of slots (2200).
- The assembly (300) according to any of the preceding claims, wherein the collecting device (20) further comprising an unloading plug (230) connected to the debris storing module (220) and being configured for switching between a first position in which the unloading plug (230) prevents the debris (8A) stored in the debris storing module (220) to leave said debris storing module (220) and a second position in which the unloading plug (230) allows the debris (8A) stored in the debris storing module (220) to leave said debris storing module (220).
- The assembly (300) according to claim 6, wherein the unloading plug (230) comprises a trap door (235) allowing the unloading plug (230) to switch between the first position and the second position.
- The assembly (300) according to claim 7, wherein the trap door (235) is removable.
- The assembly (300) according to any of claims 6 and 7, wherein the unloading plug (230) comprises a tubular portion (231) delimiting an internal opening (232).
- The assembly (300) according to claim 9, wherein the trap door (235) is configured to be moved between a blocking position, in which the trap door (235) obstructs said internal opening (232), and a free position in which debris (8A) stored into the debris storing module (220) may flow though said internal opening (232) to unload the said debris storing module (220).
- The assembly (300) according to any of the preceding claims, wherein the electrical discharge generating device (10) and the collecting device (20) extend along a same longitudinal axis (X).
- A method for collecting debris (8A) of deposits (8) in a wellbore (5) of a subterranean formation (1) using an assembly (300) according to any of the preceding claims in order to improve the recovery of formation fluids and/or gases, said method comprising the steps of:- removing (S2) deposits (8) from a wellbore wall (5A) or from an equipment (7) arranged in a wellbore (5) using the electrical discharge generating device (10),- collecting (S3, S4) debris (8A) of said deposits (8) falling by gravity into the deflector (21) of the collecting device (20) of the assembly (300), said collecting device (20) being attached to the bottom of said electrical discharge generating device (10) by the connecting shaft (214) in order to lay under said electrical discharge generating device (10), while said deposits (8) are being removed from said wellbore wall (5A) or said equipment (7) by the electrical discharge generating device (10).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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EP18164037.6A EP3546694B1 (en) | 2018-03-26 | 2018-03-26 | Device and method for collecting debris of deposits in a wellbore |
Applications Claiming Priority (1)
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EP18164037.6A EP3546694B1 (en) | 2018-03-26 | 2018-03-26 | Device and method for collecting debris of deposits in a wellbore |
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EP3546694A1 EP3546694A1 (en) | 2019-10-02 |
EP3546694B1 true EP3546694B1 (en) | 2023-12-27 |
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Citations (2)
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GB2499953A (en) * | 2013-04-10 | 2013-09-04 | Field Marshall Oil And Gas Technologies Ltd | Cleaning tool having a non-rotating stabiliser / centraliser |
NO342058B1 (en) * | 2016-12-06 | 2018-03-19 | Bri Well Services As | Apparatus and method for collecting debris from a wellbore |
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US4345650A (en) | 1980-04-11 | 1982-08-24 | Wesley Richard H | Process and apparatus for electrohydraulic recovery of crude oil |
US6227293B1 (en) | 2000-02-09 | 2001-05-08 | Conoco Inc. | Process and apparatus for coupled electromagnetic and acoustic stimulation of crude oil reservoirs using pulsed power electrohydraulic and electromagnetic discharge |
US7513303B2 (en) * | 2006-08-31 | 2009-04-07 | Baker Hughes Incorporated | Wellbore cleanup tool |
GB2534493B (en) * | 2013-08-13 | 2020-02-26 | Abrado Inc | Combination debris collection and visual validation assembly |
EP2940244B1 (en) * | 2014-04-28 | 2019-07-24 | Blue Spark Energy Inc. | Method and device for removing deposits from a formation fluid or gas transportation means |
NO338348B1 (en) * | 2015-03-31 | 2016-08-08 | Norse Oiltools As | Well cleaning tool and use of tool |
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2018
- 2018-03-26 EP EP18164037.6A patent/EP3546694B1/en active Active
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GB2499953A (en) * | 2013-04-10 | 2013-09-04 | Field Marshall Oil And Gas Technologies Ltd | Cleaning tool having a non-rotating stabiliser / centraliser |
NO342058B1 (en) * | 2016-12-06 | 2018-03-19 | Bri Well Services As | Apparatus and method for collecting debris from a wellbore |
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Title |
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ODFJELL: "The XTractR(TM) BOP Junk Catcher", 10 March 2017 (2017-03-10), pages 1 - 2, XP055768359, Retrieved from the Internet <URL:https://www.odfjellwellservices.com/media/1375/xtractr-bop-junk-catcher_20170310.pdf> [retrieved on 20210125] * |
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