CA2261415C - Method and apparatus for extracting oil - Google Patents
Method and apparatus for extracting oil Download PDFInfo
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- CA2261415C CA2261415C CA 2261415 CA2261415A CA2261415C CA 2261415 C CA2261415 C CA 2261415C CA 2261415 CA2261415 CA 2261415 CA 2261415 A CA2261415 A CA 2261415A CA 2261415 C CA2261415 C CA 2261415C
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- motive
- downhole pump
- pump according
- flow
- conduit
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Abstract
A downhole pump for the extraction of oil/petroleum comprises a motive fluid conduit for the conveyance of a motive flow, and a transport conduit connected to the motive fluid conduit for the conveyance of the induced flow and motive flow to the surface. The transport pipe includes a suction inlet for intake of the induced fluid, and houses a jet pump. The transport pipe and/or motive fluid pipe are configured to produce an annular or cylindrical motive jet through the nozzle, whereby an axial induced flow is produced through the suction inlet. The downhole pump therefore comprises an annular jet pump.
Description
METHOD AND APPARATUS FOR EXTRACTING OIL
The present invention relates to a method and apparatus for extracting oil, and more particularly to apparatus comprising a downhole pump, and a method of operating the same.
One source of oil is from wells which have a depth of less than 3000m, and which are not artesian, i.e. in which the oil will not reach the ground surface unaided. Oil from such sources may be extracted by raising it from a static level (i.e. the level to which oil will rise in the casing) to the surface by means of a pump sent down a borehole at, or close to, the depth of the oil-bearing stratum.
At present, mechanically driven pumps, such as rotodynamic (axial flow turbine) and positive displacement (travelling cavity) are used to raise the oil. Of these, the former type is quickly destroyed by grit present in the oil and latter is similarly damaged, although perhaps less quickly.
Hydraulically driven pumps, such as double-acting piston or jet pumps, are also used. Of these, the former type tend to become blocked, are quickly worn out by grit, and are suited only to low production rates.
In a jet pump, pressure energy in a motive fluid is converted to kinetic energy by passing it through a nozzle.
The resulting jet of motive fluid leaves the nozzle at high velocity, and crosses an entrainment zone, where an induced flow (including the matter to be extracted) is drawn into the jet. The two flows are mixed in a mixing chamber, and the pressure of the resultant fluid is increased in a diffuser, in order to drive the pipeline, and carry the
The present invention relates to a method and apparatus for extracting oil, and more particularly to apparatus comprising a downhole pump, and a method of operating the same.
One source of oil is from wells which have a depth of less than 3000m, and which are not artesian, i.e. in which the oil will not reach the ground surface unaided. Oil from such sources may be extracted by raising it from a static level (i.e. the level to which oil will rise in the casing) to the surface by means of a pump sent down a borehole at, or close to, the depth of the oil-bearing stratum.
At present, mechanically driven pumps, such as rotodynamic (axial flow turbine) and positive displacement (travelling cavity) are used to raise the oil. Of these, the former type is quickly destroyed by grit present in the oil and latter is similarly damaged, although perhaps less quickly.
Hydraulically driven pumps, such as double-acting piston or jet pumps, are also used. Of these, the former type tend to become blocked, are quickly worn out by grit, and are suited only to low production rates.
In a jet pump, pressure energy in a motive fluid is converted to kinetic energy by passing it through a nozzle.
The resulting jet of motive fluid leaves the nozzle at high velocity, and crosses an entrainment zone, where an induced flow (including the matter to be extracted) is drawn into the jet. The two flows are mixed in a mixing chamber, and the pressure of the resultant fluid is increased in a diffuser, in order to drive the pipeline, and carry the
-2-fluid to the surface.
In current arrangements for downhole pumps, a motive fluid is arranged to form a "central jet", so defined because of the axial solid-prismatic form of the jet. The pump configuration is such that the induced fluid enters laterally or circumferentially and is entrained by the outer surface of the motive jet.
As a jet pump includes no moving parts, it might appear to be particularly suitable for transporting abrasive matter, such as oil from a borehole.
However, conventional jet pump designs incorporate small passage diameters through which the induced fluid passes, so that it may be introduced to the motive jet laterally.
As the extracted fluid is a mixture of, inter alia, oil and grit, these passages have a tendency to become blocked. In these circumstances, functioning of the pump ceases, and the pump must be brought back to the surface for maintenance.
Furthermore, because of the small passage diameters, existing designs of jet pump are unsuitable for the heavier grades of oil which have higher viscosities.
Also, efficient functioning of existing jet pumps for oil extraction rely upon high fluid velocities, which results in a high rate of wear, particularly in the mixing chamber, due to the abrasive nature of the mixture of grit and fluid being extracted.
It has been established that the viability of many holes and fields is marginal, but that the viability would be disproportionately improved if a reduction in operating
In current arrangements for downhole pumps, a motive fluid is arranged to form a "central jet", so defined because of the axial solid-prismatic form of the jet. The pump configuration is such that the induced fluid enters laterally or circumferentially and is entrained by the outer surface of the motive jet.
As a jet pump includes no moving parts, it might appear to be particularly suitable for transporting abrasive matter, such as oil from a borehole.
However, conventional jet pump designs incorporate small passage diameters through which the induced fluid passes, so that it may be introduced to the motive jet laterally.
As the extracted fluid is a mixture of, inter alia, oil and grit, these passages have a tendency to become blocked. In these circumstances, functioning of the pump ceases, and the pump must be brought back to the surface for maintenance.
Furthermore, because of the small passage diameters, existing designs of jet pump are unsuitable for the heavier grades of oil which have higher viscosities.
Also, efficient functioning of existing jet pumps for oil extraction rely upon high fluid velocities, which results in a high rate of wear, particularly in the mixing chamber, due to the abrasive nature of the mixture of grit and fluid being extracted.
It has been established that the viability of many holes and fields is marginal, but that the viability would be disproportionately improved if a reduction in operating
-3-costs could be achieved, and/or if downtime could be reduced by increasing the reliability of the operation of the extraction pump. This would result in the viability of oil production of a particular field being less sensitive to variations in the well-head price of oil.
It is therefore an object of the present invention to provide a jet pump arrangement better suited to downhole oil production; and/or to provide improvements in relation to one or more matters discussed above; and/or to provide improvements generally.
According to an aspect of the present invention there is provided a downhole pump for the extraction of oil/petroleum comprising a motive fluid conduit for the conveyance of a motive flow, and a transport conduit connected to the motive fluid conduit for the conveyance of the induced flow and motive flow to the surface; the transport pipe comprising a suction inlet for intake of the induced fluid, and housing a jet pump comprising a nozzle, a mixing chamber and a diffuser; the transport pipe and/or motive fluid pipe being configured to produce an annular or cylindrical motive jet through the nozzle, whereby an axial induced flow is produced through the suction inlet. The downhole pump therefore comprises an annular jet pump.
By providing an annular or hollow jet of motive fluid, and ensuring that the induced flow passes through the centre of the jet, the induced flow passes through larger passage clearances than is the case in prior art jet pumps.
Therefore, the pump arrangement may be configured to eliminate the thin annuli, which are required in prior art pumps to produce an annular flow of the induced fluid. By eliminating the thin annuli, the likelihood of internal blockage by induced grit, which is common in central-type
It is therefore an object of the present invention to provide a jet pump arrangement better suited to downhole oil production; and/or to provide improvements in relation to one or more matters discussed above; and/or to provide improvements generally.
According to an aspect of the present invention there is provided a downhole pump for the extraction of oil/petroleum comprising a motive fluid conduit for the conveyance of a motive flow, and a transport conduit connected to the motive fluid conduit for the conveyance of the induced flow and motive flow to the surface; the transport pipe comprising a suction inlet for intake of the induced fluid, and housing a jet pump comprising a nozzle, a mixing chamber and a diffuser; the transport pipe and/or motive fluid pipe being configured to produce an annular or cylindrical motive jet through the nozzle, whereby an axial induced flow is produced through the suction inlet. The downhole pump therefore comprises an annular jet pump.
By providing an annular or hollow jet of motive fluid, and ensuring that the induced flow passes through the centre of the jet, the induced flow passes through larger passage clearances than is the case in prior art jet pumps.
Therefore, the pump arrangement may be configured to eliminate the thin annuli, which are required in prior art pumps to produce an annular flow of the induced fluid. By eliminating the thin annuli, the likelihood of internal blockage by induced grit, which is common in central-type
-4-jet pumps at present in use, is greatly reduced.
The configuration of the present invention also allows larger passage clearances for the oil in the induced flow, than is the case with existing designs of central jet pump.
The apparatus is therefore intrinsically more able to handle the heavier oils, i.e. those of greater viscosity, which are unable to flow freely through very narrow passages.
Preferably, the transport fluid conduit comprises a tube located inside the motive fluid conduit, which also comprises a tube, thereby defining an annulus which forms a path for the motive fluid.
It is preferred that the motive fluid pipe and the transport fluid pipe be concentric. In this way, the configuration of the pump apparatus takes maximum advantage of a given borehole (casing) diameter, than in some prior art systems in which the motive flow conduit and the transport conduit are located adjacent one another.
Perforations are provided to allow oil to enter the casing.
This embodiment also has the advantage that the pump apparatus may readily be installed down a cased borehole for the production of oil, the casing being the cylindrical metal conduit comprising the borehole. In an embodiment, the outer tube forming the motive fluid conduit comprises the casing. In an alternative embodiment, a separate casing is provided.
In an embodiment, the motive fluid, or power fluid, comprises either a light oil or water. In an embodiment the motive fluid comprises produced water, i.e. the water recovered with the oil product from the borehole system in
The configuration of the present invention also allows larger passage clearances for the oil in the induced flow, than is the case with existing designs of central jet pump.
The apparatus is therefore intrinsically more able to handle the heavier oils, i.e. those of greater viscosity, which are unable to flow freely through very narrow passages.
Preferably, the transport fluid conduit comprises a tube located inside the motive fluid conduit, which also comprises a tube, thereby defining an annulus which forms a path for the motive fluid.
It is preferred that the motive fluid pipe and the transport fluid pipe be concentric. In this way, the configuration of the pump apparatus takes maximum advantage of a given borehole (casing) diameter, than in some prior art systems in which the motive flow conduit and the transport conduit are located adjacent one another.
Perforations are provided to allow oil to enter the casing.
This embodiment also has the advantage that the pump apparatus may readily be installed down a cased borehole for the production of oil, the casing being the cylindrical metal conduit comprising the borehole. In an embodiment, the outer tube forming the motive fluid conduit comprises the casing. In an alternative embodiment, a separate casing is provided.
In an embodiment, the motive fluid, or power fluid, comprises either a light oil or water. In an embodiment the motive fluid comprises produced water, i.e. the water recovered with the oil product from the borehole system in
-5-the induced flow. The induced mixture will generally comprise oil, produced water and grit ("grit" refers to all solid matter, from clays to gravel).
The produced water is a convenient source of fluid which may be readily pressurised to form the motive fluid, and which has a low viscosity, so that it may readily pass through the nozzle of the jet pump to form the annular jet.
In an embodiment, the jet pump is of the free type, i.e. it is not attached to the casing of the borehole and is dropped into position under its own weight. Such an embodiment has the advantage that the pump may be recovered e.g. for maintenance purposes, without the need to remove tubing or casing.
It is preferred that an extraction sleeve may be fitted to the pump body, for example to the diffuser, which is adapted to co-operate with a retrieval tool. This enables the apparatus to be withdrawn readily for inspection and maintenance, minimising operational downtime and increasing the financial viability of a site.
In an embodiment, the spacing between the nozzle and the mixing chamber is adjustable, as is the annular nozzle gap.
This enables the pump to be adjusted to suit the required conditions of lift and flow.
In an embodiment there is provided anti-arching means to prevent external blockage of the suction inlet by solid material at the point of entering the pump. Arching refers to the arch formed by inter-particle contact in a non-linear flow of liquid containing solid particles. Either differential acceleration of the phases causes the volumetric concentration to rise until contact occurs or
The produced water is a convenient source of fluid which may be readily pressurised to form the motive fluid, and which has a low viscosity, so that it may readily pass through the nozzle of the jet pump to form the annular jet.
In an embodiment, the jet pump is of the free type, i.e. it is not attached to the casing of the borehole and is dropped into position under its own weight. Such an embodiment has the advantage that the pump may be recovered e.g. for maintenance purposes, without the need to remove tubing or casing.
It is preferred that an extraction sleeve may be fitted to the pump body, for example to the diffuser, which is adapted to co-operate with a retrieval tool. This enables the apparatus to be withdrawn readily for inspection and maintenance, minimising operational downtime and increasing the financial viability of a site.
In an embodiment, the spacing between the nozzle and the mixing chamber is adjustable, as is the annular nozzle gap.
This enables the pump to be adjusted to suit the required conditions of lift and flow.
In an embodiment there is provided anti-arching means to prevent external blockage of the suction inlet by solid material at the point of entering the pump. Arching refers to the arch formed by inter-particle contact in a non-linear flow of liquid containing solid particles. Either differential acceleration of the phases causes the volumetric concentration to rise until contact occurs or
- 6 -differential velocity of fine and coarse particle sizes causes a concentration of the fine within the coarse until the space occupied becomes effectively solid.
It is preferred that the anti-arching means comprises anti-arching jets.. High velocity jets blast are used to disrupt establishment of a incipient arches. In an embodiment, anti-arching jets are supplied from the motive fluid supply.
It has been found that anti-archi.ng jets may be supplied from the main motive fluid., without significantly effecting the performance of the main pump. In this way, the need to provide a separate fluid supply in the borehole to power the anti-aching jets is avoided..
The. anti-arching means may comprise additionally or alte.rnatively a re'-entrant or Borda design of suction inlet., which also serves to deny the arch-a springing, to reduce or prevent arching.
In accordance with a first aspect of the present invention-, there is provided a downhole pump for use in association with a borehole casing for the extraction of oil from a borehole., the downhole pump comprising a motive fluid conduit constructed and arranged to be located inside and spaced apart from an inner perimetric surface of the borehole casing, and a transport conduit located inside and connected to the motive fluid conduit, and comprising a suction inlet, and housing a jet pump comprising a nozzle, a mixing chamber and a diffuser, wherein -6a-(i) an inner surface of the motive fluid conduit and an outer surface of the transport conduit together define a motive flow input path;
(ii) at least one of the motive fluid conduit and the transport conduit are configured to produce a motive jet of the motive flow through the nozzle;
(iii) the suction inlet is constructed and arranged to convey an induced flow of oil therethrough in response to the motive flow; and (iv) the transport conduit is constructed and arranged to convey the motive flow and the induced flow to a discharge outlet.
1.5 An embodiment of the invention will now be described by way of example only with reference to the following illustrative drawing in which:
20. Figure 1 is a section through a down hole jet pump arrangement according to the present invention..
As can be seen in Figure 1, downhole pump apparatus 10 for the extraction of oil/petroleum according to the present 25 invention is provided. ."Downhole" refers to the location of the extraction pump.. It need not be at or near the bottom of the hole since there may be more than one oil-bearing stratum, and the borehole may also penetrate aquifers. A
borehole is formed by a casing 20. Perforations allow oil 30 to enter the casing 20. Packers (not shown) are used to
It is preferred that the anti-arching means comprises anti-arching jets.. High velocity jets blast are used to disrupt establishment of a incipient arches. In an embodiment, anti-arching jets are supplied from the motive fluid supply.
It has been found that anti-archi.ng jets may be supplied from the main motive fluid., without significantly effecting the performance of the main pump. In this way, the need to provide a separate fluid supply in the borehole to power the anti-aching jets is avoided..
The. anti-arching means may comprise additionally or alte.rnatively a re'-entrant or Borda design of suction inlet., which also serves to deny the arch-a springing, to reduce or prevent arching.
In accordance with a first aspect of the present invention-, there is provided a downhole pump for use in association with a borehole casing for the extraction of oil from a borehole., the downhole pump comprising a motive fluid conduit constructed and arranged to be located inside and spaced apart from an inner perimetric surface of the borehole casing, and a transport conduit located inside and connected to the motive fluid conduit, and comprising a suction inlet, and housing a jet pump comprising a nozzle, a mixing chamber and a diffuser, wherein -6a-(i) an inner surface of the motive fluid conduit and an outer surface of the transport conduit together define a motive flow input path;
(ii) at least one of the motive fluid conduit and the transport conduit are configured to produce a motive jet of the motive flow through the nozzle;
(iii) the suction inlet is constructed and arranged to convey an induced flow of oil therethrough in response to the motive flow; and (iv) the transport conduit is constructed and arranged to convey the motive flow and the induced flow to a discharge outlet.
1.5 An embodiment of the invention will now be described by way of example only with reference to the following illustrative drawing in which:
20. Figure 1 is a section through a down hole jet pump arrangement according to the present invention..
As can be seen in Figure 1, downhole pump apparatus 10 for the extraction of oil/petroleum according to the present 25 invention is provided. ."Downhole" refers to the location of the extraction pump.. It need not be at or near the bottom of the hole since there may be more than one oil-bearing stratum, and the borehole may also penetrate aquifers. A
borehole is formed by a casing 20. Perforations allow oil 30 to enter the casing 20. Packers (not shown) are used to
-7-isolate sections of the casing. They fill and seal the annulus between casing and tubing inside the casing which forms the conduits to convey materials up or down the borehole.
The downhole pump apparatus 10 comprising a motive fluid conduit in the form of a cylindrical outer tube 22 for the conveyance of a motive flow A, and a concentric transport conduit in the form of cylindrical inner tube 24, of smaller diameter than the outer tube 22, for the conveyance of the induced flow and motive flow B to the surface.
The inner tube 24 comprising a suction inlet 26 for the intake of the induced fluid from the casing 20. The inlet 26 is in the form of a re-entrant or Borda inlet, that is an inlet in which the inlet conduit projects into the space containing the fluid to be induced. Such an inlet has been found to minimised arching around the inlet tube 26, as discussed above.
Both inner tube 24 and outer tube 22 are connected through foot 28 which may also incorporate arch-breaker nozzles 30. The inner tube 24 houses a jet pump 32 comprising a nozzle 34, a mixing chamber 36 and a diffuser 38. The nozzle 34 is an extension of the inlet 26, and serves to convert the pressure energy in the motive fluid A into kinetic energy, such that the fluid leaves the nozzle in a high energy stream. The mixing chamber 36 refers to the conduit in which energy is shared between the motive and induced flows. The annular gap between nozzle 34 and the mixing chamber 36 forms the motive jet. The diffuser 38 is the divergent taper employed in hydraulic devices to recover pressure energy from velocity energy.
The spacing of the nozzle 34 and mixing chamber 36 is
The downhole pump apparatus 10 comprising a motive fluid conduit in the form of a cylindrical outer tube 22 for the conveyance of a motive flow A, and a concentric transport conduit in the form of cylindrical inner tube 24, of smaller diameter than the outer tube 22, for the conveyance of the induced flow and motive flow B to the surface.
The inner tube 24 comprising a suction inlet 26 for the intake of the induced fluid from the casing 20. The inlet 26 is in the form of a re-entrant or Borda inlet, that is an inlet in which the inlet conduit projects into the space containing the fluid to be induced. Such an inlet has been found to minimised arching around the inlet tube 26, as discussed above.
Both inner tube 24 and outer tube 22 are connected through foot 28 which may also incorporate arch-breaker nozzles 30. The inner tube 24 houses a jet pump 32 comprising a nozzle 34, a mixing chamber 36 and a diffuser 38. The nozzle 34 is an extension of the inlet 26, and serves to convert the pressure energy in the motive fluid A into kinetic energy, such that the fluid leaves the nozzle in a high energy stream. The mixing chamber 36 refers to the conduit in which energy is shared between the motive and induced flows. The annular gap between nozzle 34 and the mixing chamber 36 forms the motive jet. The diffuser 38 is the divergent taper employed in hydraulic devices to recover pressure energy from velocity energy.
The spacing of the nozzle 34 and mixing chamber 36 is
-8-maintained by split lantern 40 integrated by garter springs 42. "Lantern" is a metaphoric term applied to cylindrical components having lateral holes for access or flow. Split shims 44 allow adjustment of the annular nozzle gap to suit the required conditions of lift and flow.
The inner tube 24 and outer tube 22 are configured to produce an annular or cylindrical motive jet through the nozzle 34, whereby an axial, or central, induced flow is produced through the suction inlet 26 which is entrained by the inner surface of the motive jet. The jet pump 32 is therefore termed an annular jet pump. The pressure in the motive fluid A is maintained between inlet seal 46 and discharge seal 48.
In use, the pump apparatus 10 is inserted into the borehole by gravity and retrieved by a retrieval device inserted down the inner tubing 24. An extraction sleeve 50 may be fitted to the diffuser 38 to assist in attachment of the retrieval tool.
Motive (power) fluid A is passed down to the pumping apparatus 10 under pressure. The motive fluid comprises produced water, i.e. the water recovered with the oil product from the borehole system. The fluid A flows inside the outer tubing 22 but outside the inner tubing 24. Oil within the casing 20 is induced by the pump 32 to form induced flow B. This flow B will generally contain also produced water and grit.
Flow A and B together form the discharged flow C which is conveyed to the surface inside inner tubing 24.
Some of Flow A will be emitted from the arch-breaker nozzles 30 formed in foot 28. If induced flow is gritty,
The inner tube 24 and outer tube 22 are configured to produce an annular or cylindrical motive jet through the nozzle 34, whereby an axial, or central, induced flow is produced through the suction inlet 26 which is entrained by the inner surface of the motive jet. The jet pump 32 is therefore termed an annular jet pump. The pressure in the motive fluid A is maintained between inlet seal 46 and discharge seal 48.
In use, the pump apparatus 10 is inserted into the borehole by gravity and retrieved by a retrieval device inserted down the inner tubing 24. An extraction sleeve 50 may be fitted to the diffuser 38 to assist in attachment of the retrieval tool.
Motive (power) fluid A is passed down to the pumping apparatus 10 under pressure. The motive fluid comprises produced water, i.e. the water recovered with the oil product from the borehole system. The fluid A flows inside the outer tubing 22 but outside the inner tubing 24. Oil within the casing 20 is induced by the pump 32 to form induced flow B. This flow B will generally contain also produced water and grit.
Flow A and B together form the discharged flow C which is conveyed to the surface inside inner tubing 24.
Some of Flow A will be emitted from the arch-breaker nozzles 30 formed in foot 28. If induced flow is gritty,
-9-then arching around the suction inlet 26 can be a problem.
An arch may be prevented from forming by using the motive flow A to produce additional jets.
It has been found that a downhole pumping apparatus according to the present invention, unlike all central-type jet pumps, has characteristics that accurately match the pumping requirements of downhole pumping.
In addition, as the pump can operate at a lower motive pressure, when compared with conventional central jet pump apparatus, to provide an equal discharge pressure. The lower operating pressure leads to reduced wear rates and greater in-situ life than the central-type jet pumps or travelling cavity pumps at present in use.
Apparatus according to the present invention has also been found to induce product at a higher head ratio than central-type pumps and also at a higher flow ratio at high head ratios, the flow ratio being defined as the ratio of the flow rate of the induced mixture to the flow rate of the motive fluid and the head ratio as the ratio of the head developed by the motive fluid.
An arch may be prevented from forming by using the motive flow A to produce additional jets.
It has been found that a downhole pumping apparatus according to the present invention, unlike all central-type jet pumps, has characteristics that accurately match the pumping requirements of downhole pumping.
In addition, as the pump can operate at a lower motive pressure, when compared with conventional central jet pump apparatus, to provide an equal discharge pressure. The lower operating pressure leads to reduced wear rates and greater in-situ life than the central-type jet pumps or travelling cavity pumps at present in use.
Apparatus according to the present invention has also been found to induce product at a higher head ratio than central-type pumps and also at a higher flow ratio at high head ratios, the flow ratio being defined as the ratio of the flow rate of the induced mixture to the flow rate of the motive fluid and the head ratio as the ratio of the head developed by the motive fluid.
Claims (14)
1. A downhole pump for use in association with a borehole casing for the extraction of oil from a borehole, the downhole pump comprising a motive fluid conduit constructed and arranged to be located inside and spaced apart from an inner perimetric surface of the borehole casing, and a transport conduit located inside and connected to the motive fluid conduit, and comprising a suction inlet, and housing a jet pump comprising a nozzle, a mixing chamber and a diffuser, wherein (i) an inner surface of the motive fluid conduit and an outer surface of the transport conduit together define a motive flow input path;
(ii) at least one of the motive fluid conduit and the transport conduit are configured to produce a motive jet of the motive flow through the nozzle;
(iii) the suction inlet is constructed and arranged to convey an induced flow of oil therethrough in response to the motive flow; and (iv) the transport conduit is constructed and arranged to convey the motive flow and the induced flow to a discharge outlet.
(ii) at least one of the motive fluid conduit and the transport conduit are configured to produce a motive jet of the motive flow through the nozzle;
(iii) the suction inlet is constructed and arranged to convey an induced flow of oil therethrough in response to the motive flow; and (iv) the transport conduit is constructed and arranged to convey the motive flow and the induced flow to a discharge outlet.
2. A downhole pump according to claim 1, wherein the jet pump is an annular jet pump.
3. A downhole pump according to claim 1 or claim 2, wherein the motive fluid conduit and the transport fluid conduit are concentric.
4. A downhole pump according to any one of claims 1 to 3, further comprising a perforated borehole casing.
5. A downhole pump according to claim 4, wherein the motive fluid conduit is constructed integrally with the casing.
6. A downhole pump according to any one of claims 1 to 5, wherein the motive fluid is selected from the group consisting of light oil, water, and produced water.
7. A downhole pump according to any one of claims 1 to 6, wherein the jet pump is of the free type.
8. A downhole pump according to claim 7, wherein the jet pump has a body fitted with an extraction sleeve constructed and arranged to co-operate with a retrieval tool.
9. A downhole pump according to any one of claims 1 to 8, wherein the nozzle and the mixing chamber are spaced apart from each other and the space therebetween is adjustable.
10. A downhole pump according to any one of claims 1 to 8, further comprising an annular nozzle gap which is adjustable.
11. A downhole pump according to any one of claims 1 to 10, further comprising an anti-arching means constructed and arranged to prevent external blockage of the suction inlet by solid material at a point of entry into the pump.
12. A downhole pump according to claim 11, wherein the anti-arching means comprises anti-arching jets.
13. A downhole pump according to claim 12, wherein the anti-arching jets are supplied from the motive fluid conduit.
14. A downhole pump according to claim 13, wherein the anti-arching means comprises a re-entrant inlet having a conduit constructed and arranged to project into an induced fluid containment region.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9802854.1 | 1998-02-11 | ||
| GBGB9802854.1A GB9802854D0 (en) | 1998-02-11 | 1998-02-11 | Method and apparatus for extracting oil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2261415A1 CA2261415A1 (en) | 1999-08-11 |
| CA2261415C true CA2261415C (en) | 2007-10-23 |
Family
ID=10826782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2261415 Expired - Fee Related CA2261415C (en) | 1998-02-11 | 1999-02-09 | Method and apparatus for extracting oil |
Country Status (2)
| Country | Link |
|---|---|
| CA (1) | CA2261415C (en) |
| GB (1) | GB9802854D0 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103047127B (en) * | 2012-12-18 | 2016-01-20 | 安塞凯源工贸有限责任公司 | A kind of exhaust pump that can solve high liquid level (HLL) exhaust problem |
| CN110284858B (en) * | 2019-06-26 | 2021-08-06 | 大港油田集团有限责任公司 | Tubing string for viscosity reduction and fracturing or acidizing of thickened oil of bidirectional jet pump and combined operation process thereof |
-
1998
- 1998-02-11 GB GBGB9802854.1A patent/GB9802854D0/en not_active Ceased
-
1999
- 1999-02-09 CA CA 2261415 patent/CA2261415C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| GB9802854D0 (en) | 1998-04-08 |
| CA2261415A1 (en) | 1999-08-11 |
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