CA2388191A1 - Multi-intake progressive cavity pump - Google Patents
Multi-intake progressive cavity pump Download PDFInfo
- Publication number
- CA2388191A1 CA2388191A1 CA 2388191 CA2388191A CA2388191A1 CA 2388191 A1 CA2388191 A1 CA 2388191A1 CA 2388191 CA2388191 CA 2388191 CA 2388191 A CA2388191 A CA 2388191A CA 2388191 A1 CA2388191 A1 CA 2388191A1
- Authority
- CA
- Canada
- Prior art keywords
- pump
- intake
- stator
- inlets
- progressive cavity
- 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.)
- Abandoned
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
- F04C2/107—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth
- F04C2/1071—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type
- F04C2/1073—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member with helical teeth the inner and outer member having a different number of threads and one of the two being made of elastic materials, e.g. Moineau type where one member is stationary while the other member rotates and orbits
- F04C2/1075—Construction of the stationary member
Abstract
A multi-intake progressive cavity pump which has a series of secondary liquid flow inlets along the bottom of the stator to increase the number of inlets to the pump. Fluid is drawn into the secondary inlets along the outside of the stator barrel. The secondary inlets allow continued operation should the primary inlet become blocked. The provision of multiple inlets causes much-needed turbulence within the well bore which will keep the sand in suspension and help the bore from sand bridging.
Description
;a j. ., ;
TITLE OF THE INVENTION:
Multi-Intake Progressive Cavity Pump FIELD OF THE INVENTION
The present invention relates to a multi-intake progressive cavity pump BACKGROUND OF THE INVENTION
In a conventional progressive cavity pump application lOfluid is drawn into the pump through one inlet at the bottom of the pump. The fluid has to travel through a tag bar, which is attached to the bottom of the stator. There is to date no means of allowing fluid into the pump cavities if there is any restriction into the bottom inlet on the stator. Premature pc l5pump failure often occurs due to lack of inflow into the pump inlet.
SUMMARY OF THE INVENTION
What is required is a progressive cavity pump which is not 20as susceptible to flow restrictions or blockages.
According to the present invention there is provided a multi-intake progressive cavity pump which includes a tubular stator housing having a primary inlet at one end. A rotor is 25 mounted for rotation within the stator housing. A plurality of progressive cavities are formed between the rotor and the stator. Several secondary liquid flow inlets are progressively positioned through the stator housing adjacent to the primary inlet.
With the multi-intake progressive cavity pump, as described above, the secondary inlets allow continued operation should the primary inlet become blocked. The provision of multiple inlets causes much-needed turbulence within the well 35bore which will keep the sand in suspension and help the bore from sand bridging.
r Ith r::~ - t ~ ~, i BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose 5of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a longitudinal axial section of a multi-intake progressive cavity pump constructed in accordance with the lOteachings of the present invention.
FIGURE 2 is a longitudinal axial section of the multi-intake progressive cavity pump illustrated in FIGURE l, in operation.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a multi-intake progressive cavity pump generally identified by reference numeral 100, will now be described with reference to FIGURES 1 through 2.
Structure:
Referring to Figure 1, this invention is used in conjunction with a Progressive Cavity (PC) Pump to increase overall pump life and efficiencies. The pc pump consists of two major components, a rotor (1) and stator (2) . The rotor is the steel rotary member and is usually in the form of a single external helix. The stator is the stationary member and consists of a steel tube housing with a resilient, abrasion resistant elastomer with a dual internal helix design. When 30the rotor is placed inside the stator a series of sealed cavities are formed. In the present invention rotor (1) installed in the stator (2) , which has elastomer (3) bonded to the inside (9) of the stator barrel. A tag bar (4) is threaded to the bottom of the stator (2). Conventional fluid intake (5) 35is achieved through the bottom of the tag bar (4) and then drawn into the main pump inlet (10). Fluid can also be drawn I~d " ., , I ~ a in through slots (11) in the tag bar (4).
In order to improve fluid flow, multi-intakes (6,7,8) are shown drilled radially into the side of the stator (2). The 5hole passes through the metal barrel (12) and through the elastomer ( 3 ) into the cavity of the stator ( 13 ) . The holes are countersunk (14) to allow for a non-interrupted flow into .
the inlet. The multi-intakes (6,7,8) are positioned such that a low pressure is developed in the cavity (13) between the l0 stages of intakes (6, 7, 8) . This low pressure that is developed in the cavities (13) insures that the fluid is going to travel to the multi-intakes (6,7,8). Pressure is also developed between the intakes, within the cavity (13) to also force fluid out of the openings in the stator to agitate the fluid in the 15 wellbore. Inflow and outflow through the multi-intakes (6, 7, 8) is dependent upon the position of the rotor in its rotation.
Fluid will be pulled in and pushed out.
Sizing of the intakes (6,7,8) is dependent on the inlet 20area created by the pump. Number of holes is dependent on the displacement of pc pump, lift of PC Pump and well conditions.
Operation:
Figure 2 illustrates the multi-intakes (6,7,8) in a 25wellbore. The pc pump is shown in a typical wellbore, the rotor (1) is suspended and rotated from surface through a string of rods (17). The stator (2) is head stationary and is supported from surface through the tubing string (16).
30 Production fluid (19) enters the wellbore (20) through the perforations (18). The PC Pump can pick up the fluid from different intakes, axially along the stator. The intakes (6,7,8) are located such that there is a co-mingling of fluid.
If the well slugs sand or gas slugs, the multi-intakes (6,7,8) 35wi11 allow fluid to be picked up through the various openings in the pump. Sand bridging will be reduced due to the I~ Ivl., 1d ; I I
TITLE OF THE INVENTION:
Multi-Intake Progressive Cavity Pump FIELD OF THE INVENTION
The present invention relates to a multi-intake progressive cavity pump BACKGROUND OF THE INVENTION
In a conventional progressive cavity pump application lOfluid is drawn into the pump through one inlet at the bottom of the pump. The fluid has to travel through a tag bar, which is attached to the bottom of the stator. There is to date no means of allowing fluid into the pump cavities if there is any restriction into the bottom inlet on the stator. Premature pc l5pump failure often occurs due to lack of inflow into the pump inlet.
SUMMARY OF THE INVENTION
What is required is a progressive cavity pump which is not 20as susceptible to flow restrictions or blockages.
According to the present invention there is provided a multi-intake progressive cavity pump which includes a tubular stator housing having a primary inlet at one end. A rotor is 25 mounted for rotation within the stator housing. A plurality of progressive cavities are formed between the rotor and the stator. Several secondary liquid flow inlets are progressively positioned through the stator housing adjacent to the primary inlet.
With the multi-intake progressive cavity pump, as described above, the secondary inlets allow continued operation should the primary inlet become blocked. The provision of multiple inlets causes much-needed turbulence within the well 35bore which will keep the sand in suspension and help the bore from sand bridging.
r Ith r::~ - t ~ ~, i BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, the drawings are for the purpose 5of illustration only and are not intended to in any way limit the scope of the invention to the particular embodiment or embodiments shown, wherein:
FIGURE 1 is a longitudinal axial section of a multi-intake progressive cavity pump constructed in accordance with the lOteachings of the present invention.
FIGURE 2 is a longitudinal axial section of the multi-intake progressive cavity pump illustrated in FIGURE l, in operation.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The preferred embodiment, a multi-intake progressive cavity pump generally identified by reference numeral 100, will now be described with reference to FIGURES 1 through 2.
Structure:
Referring to Figure 1, this invention is used in conjunction with a Progressive Cavity (PC) Pump to increase overall pump life and efficiencies. The pc pump consists of two major components, a rotor (1) and stator (2) . The rotor is the steel rotary member and is usually in the form of a single external helix. The stator is the stationary member and consists of a steel tube housing with a resilient, abrasion resistant elastomer with a dual internal helix design. When 30the rotor is placed inside the stator a series of sealed cavities are formed. In the present invention rotor (1) installed in the stator (2) , which has elastomer (3) bonded to the inside (9) of the stator barrel. A tag bar (4) is threaded to the bottom of the stator (2). Conventional fluid intake (5) 35is achieved through the bottom of the tag bar (4) and then drawn into the main pump inlet (10). Fluid can also be drawn I~d " ., , I ~ a in through slots (11) in the tag bar (4).
In order to improve fluid flow, multi-intakes (6,7,8) are shown drilled radially into the side of the stator (2). The 5hole passes through the metal barrel (12) and through the elastomer ( 3 ) into the cavity of the stator ( 13 ) . The holes are countersunk (14) to allow for a non-interrupted flow into .
the inlet. The multi-intakes (6,7,8) are positioned such that a low pressure is developed in the cavity (13) between the l0 stages of intakes (6, 7, 8) . This low pressure that is developed in the cavities (13) insures that the fluid is going to travel to the multi-intakes (6,7,8). Pressure is also developed between the intakes, within the cavity (13) to also force fluid out of the openings in the stator to agitate the fluid in the 15 wellbore. Inflow and outflow through the multi-intakes (6, 7, 8) is dependent upon the position of the rotor in its rotation.
Fluid will be pulled in and pushed out.
Sizing of the intakes (6,7,8) is dependent on the inlet 20area created by the pump. Number of holes is dependent on the displacement of pc pump, lift of PC Pump and well conditions.
Operation:
Figure 2 illustrates the multi-intakes (6,7,8) in a 25wellbore. The pc pump is shown in a typical wellbore, the rotor (1) is suspended and rotated from surface through a string of rods (17). The stator (2) is head stationary and is supported from surface through the tubing string (16).
30 Production fluid (19) enters the wellbore (20) through the perforations (18). The PC Pump can pick up the fluid from different intakes, axially along the stator. The intakes (6,7,8) are located such that there is a co-mingling of fluid.
If the well slugs sand or gas slugs, the multi-intakes (6,7,8) 35wi11 allow fluid to be picked up through the various openings in the pump. Sand bridging will be reduced due to the I~ Ivl., 1d ; I I
agitating of the fluid flowing to numerous intakes.
The Multi-Intake Progressive Cavity Pump, as described above, utilizes a simple invention that will allow the PC Pump 5to have more than one intake. Some of the main sources of pumping problems can be directly related to poor pump inflow.
If the flow of fluid can be unrestricted into the pump, better pump performance and pump life can be achieved.
lOSome of the main pumping problems can be attributed to sand bridging, sand slugging, gas locking, higher viscosity fluid and poor inflow. With the above problems, higher operational cost are required to try and combat these problems by using a repetitive load program flushing the 15we11, circulating, foaming and coil tubing jobs.
With the addition of the multi-intake pump the fluid now has more than one direction to flow. The multi-intakes will also agitate the fluid, which will help with sand suspension 20and help the bore from sand bridging. More than one flow path will cause the much-needed turbulence within the well bore. If one intake does become plugged another intake will be utilized thus preventing premature pump failure.
25lncreased pump efficiencies and life can be achieved with the mufti-intake design by preventing the different types of inflow problems. A reduction in operating cost will also be reduced with this invention.
-Reduce sand bridging -Reduce pc pump problems associated with gas locking -Reduce pc pump problems associated with sand slugging -Allows more 35inflow area in higher viscosity wells -Prevents premature pump failure -Increased efficiency due to more intake a,a: . : ; i In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are Snot excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
a
The Multi-Intake Progressive Cavity Pump, as described above, utilizes a simple invention that will allow the PC Pump 5to have more than one intake. Some of the main sources of pumping problems can be directly related to poor pump inflow.
If the flow of fluid can be unrestricted into the pump, better pump performance and pump life can be achieved.
lOSome of the main pumping problems can be attributed to sand bridging, sand slugging, gas locking, higher viscosity fluid and poor inflow. With the above problems, higher operational cost are required to try and combat these problems by using a repetitive load program flushing the 15we11, circulating, foaming and coil tubing jobs.
With the addition of the multi-intake pump the fluid now has more than one direction to flow. The multi-intakes will also agitate the fluid, which will help with sand suspension 20and help the bore from sand bridging. More than one flow path will cause the much-needed turbulence within the well bore. If one intake does become plugged another intake will be utilized thus preventing premature pump failure.
25lncreased pump efficiencies and life can be achieved with the mufti-intake design by preventing the different types of inflow problems. A reduction in operating cost will also be reduced with this invention.
-Reduce sand bridging -Reduce pc pump problems associated with gas locking -Reduce pc pump problems associated with sand slugging -Allows more 35inflow area in higher viscosity wells -Prevents premature pump failure -Increased efficiency due to more intake a,a: . : ; i In this patent document, the word "comprising" is used in its non-limiting sense to mean that items following the word are included, but items not specifically mentioned are Snot excluded. A reference to an element by the indefinite article "a" does not exclude the possibility that more than one of the element is present, unless the context clearly requires that there be one and only one of the elements.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
a
Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
51. A multi-intake progressive cavity pump, comprising:
a tubular stator housing having a primary inlet at one end;
a rotor mounted for rotation within the stator housing;
a plurality of progressive cavities being formed between the rotor and the stator; and several secondary liquid flow inlets progressively positioned through the stator housing adjacent to the primary inlet.
OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
51. A multi-intake progressive cavity pump, comprising:
a tubular stator housing having a primary inlet at one end;
a rotor mounted for rotation within the stator housing;
a plurality of progressive cavities being formed between the rotor and the stator; and several secondary liquid flow inlets progressively positioned through the stator housing adjacent to the primary inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2388191 CA2388191A1 (en) | 2002-05-28 | 2002-05-28 | Multi-intake progressive cavity pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2388191 CA2388191A1 (en) | 2002-05-28 | 2002-05-28 | Multi-intake progressive cavity pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2388191A1 true CA2388191A1 (en) | 2003-11-28 |
Family
ID=29783825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2388191 Abandoned CA2388191A1 (en) | 2002-05-28 | 2002-05-28 | Multi-intake progressive cavity pump |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2388191A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8079753B2 (en) | 2008-11-18 | 2011-12-20 | 1350363 Alberta Ltd. | Agitator tool for progressive cavity pump |
-
2002
- 2002-05-28 CA CA 2388191 patent/CA2388191A1/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8079753B2 (en) | 2008-11-18 | 2011-12-20 | 1350363 Alberta Ltd. | Agitator tool for progressive cavity pump |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Dead |