Abstract:
An oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A flow channel into the well bore enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area. A pumping mechanism is provided on the tool body, the pumping mechanism includes upper and lower impeller devices. The upper impeller device is driven by the working fluid. The lower impeller device is rotated by the upper impeller device. Each upper and lower impeller devices are connected with a shaft. A specially configured flow diverter directs the working fluid to an impeller blade in between the top and bottom of an upper impeller device.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This is a nonprovisional Patent Application of U.S. Provisional Patent Application Ser. No. 61/566,312, filed 2 Dec. 2011, which is hereby incorporated herein by reference. 
     Priority of U.S. Provisional Patent Application Ser. No. 61/566,312, filed 2 Dec. 2011, incorporated herein by reference, is hereby claimed. 
    
    
     STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT 
     Not applicable 
     REFERENCE TO A “MICROFICHE APPENDIX” 
     Not applicable 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to oil well pumps. More particularly, the present invention relates to a downhole oil well pump apparatus that uses a circulating working fluid to drive a specially configured pump that is operated by the working fluid and wherein the pump transmits oil from the well to the surface by commingling the pumped oil with the working fluid, oil and the working fluid being separated at the wellhead or earth&#39;s surface. Even more particularly, the present invention relates to an oil well pump that is operated in a downhole cased, production pipe environment that utilizes a pump having a single pump shaft that has impeller devices at each end of the pump shaft, one of the impeller devices being driven by the working fluid, the other impeller device pumping the oil to be retrieved. 
     2. General Background of the Invention 
     In the pumping of oil from wells, various types of pumps are utilized, the most common of which is a surface mounted pump that reciprocates between lower and upper positions. Examples include the common oil well pumpjack, and the Ajusta® pump. Such pumps reciprocate sucker rods that are in the well and extend to the level of producing formation. One of the problems with pumps is the maintenance and repair that must be performed from time to time. 
     BRIEF SUMMARY OF THE INVENTION 
     The present invention provides an improved pumping system from pumping oil from a well that provides a downhole pump apparatus that is operated with a working fluid that operates a specially configured pumping arrangement that includes a common shaft. One end portion of the shaft is an impeller that is driven by the working fluid. The other end portion of the shaft has an impeller that pumps oil from the well. In this arrangement, both the oil being pumped and the working fluid commingle as they are transmitted to the surface. A separator is used at the earth&#39;s surface to separate the working fluid (for example, water) and the oil. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a flow diverter structure mounted in the tool body, the flow diverter structure including a bearing and a vertically extending portion that extends down from the bearing, a pumping mechanism on the tool body, the pumping mechanism including a first pair of impellers that are driven by the working fluid and a second pair of impellers that are rotated by the first impellers, the second impellers pumping oil from the well via the tool body, each pair of impellers having blades that engage so that one impeller rotates with the other for each of said pairs, the first pair of impellers rotatably attached to the bearing part of the flow diverter, wherein the working fluid flows downwardly through the flow diverter and then to the first impellers, wherein the vertically extending portion of the flow diverter has a plurality of discharge ports including at least two discharge ports that form an obtuse angle and that direct fluid flow to the outer half of the impeller blades, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     In one embodiment, the apparatus further comprises a filter in the tool body that is positioned to filter the working fluid before it reaches the pumping mechanism. 
     In one embodiment, the apparatus further comprises a filter in the tool body that is positioned to filter the oil being pumped before it reaches the pumping mechanism. 
     In one embodiment, the working fluid is water or oil or a mixture of oil and water. 
     In one embodiment, the working fluid is a fluid mixture of oil and water. 
     In one embodiment, the working fluid is oil. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a flow diverter carried in the tool body and positioned to receive flow from the flow channel, the flow diverter including a disk and a vertically extending portion attached to the disk and having a generally vertically oriented flow bore, a pumping mechanism on the tool body, the pumping mechanism including a first impeller that is driven by the working fluid and a second impeller that is rotated by the first impeller, the second impeller pumping oil from the well via the tool body, each impeller having radially extending blades, wherein the vertically extending portion of the flow diverter has a plurality of discharge ports including at least two discharge ports that form an obtuse angle and that direct fluid flow to the outer half of the impeller blades, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, the tool body having a tool body bore and upper and lower end portions, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a flow diverter that occupies the tool body bore at the upper end portion of the tool body and positioned to receive flow from the flow channel, the flow diverter having a transverse disk and a downwardly extending member having discharge ports, a pumping mechanism on the tool body, the pumping mechanism including a first impeller that is driven by the working fluid and a second impeller that is rotated by the first impeller, the second impeller pumping oil from the well via the tool body, wherein each impeller has impeller teeth, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area, and wherein the flow diverter has a plurality of discharge ports that are vertically spaced apart to direct fluid to the first impeller at upper and lower positions. 
     In one embodiment, the apparatus further comprises a swab cup on the tool body that enables the tool body to be pumped to the well head area using the working fluid. 
     In one embodiment, the apparatus further comprises a swab cup on the tool body that enables the tool body to be pumped into the well bore via the production tubing string using the working fluid. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a pumping mechanism on the tool body, the pumping mechanism including a first impeller that is driven by the working fluid and a second impeller that is rotated by the first impeller, the second impeller pumping oil from the well via the tool body, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area, and a flow diverter that received flow from the flow channel and transmits that received flow to the impellers at first upper and second lower positions. 
     In one embodiment, the impellers include upper and lower pairs of impellers, each upper impeller connected to a lower impeller by a common shaft. 
     In one embodiment, the impellers include upper and lower impellers connected by a common shaft. 
     In one embodiment, the pumping mechanism includes upper and lower impeller mechanisms, each impeller mechanism having an inner rotor having multiple lobes that interfaces with an outer rotor having more lobes than the inner rotor. 
     In one embodiment, the apparatus further comprises a check valve positioned on the tool body above the pumping mechanism that prevents oil flow inside the tool body above the pumping mechanism. 
     In one embodiment, the apparatus further comprises a check valve positioned below the pumping mechanism that prevents the flow of the working fluid inside the tool body to a position below the tool body. 
     In one embodiment, the impellers include upper and lower impellers connected by only one common shaft. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a pumping mechanism on the tool body, the pumping mechanism including a first impeller that is driven by the working fluid and a second impeller that is rotated by the first impeller, the second impeller pumping oil from the well via the tool body, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     In one embodiment, the apparatus further comprises a check valve on the tool body that prevents oil flow inside the tool body above the pumping mechanism. 
     In one embodiment, the apparatus further comprises a check valve on the tool body that prevents the flow of the working fluid inside the tool body to a position below the tool body. 
     In one embodiment, the impellers include upper and lower impellers connected by a common shaft. 
     In one embodiment, the pumping mechanism includes a impeller mechanism. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a pumping mechanism on the tool body, the pumping mechanism including a first impeller device that is driven by the working fluid and a second impeller device that is powered by the first impeller device, the second impeller device pumping oil from the well via the tool body, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     The present invention provides an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a flow diverter structure mounted in the tool body, the flow diverter structure including a bearing and a vertically extending portion that extends down from the bearing, a pumping mechanism on the tool body, the pumping mechanism including a first pair of impellers that are driven by the working fluid and a second pair of impellers that are rotated by the first impellers, the second impellers pumping oil from the well via the tool body, each pair of impellers having blades that engage so that one impeller rotates with the other for each of said pairs, the first pair of impellers rotatably attached to the bearing part of the flow diverter, wherein the working fluid flows downwardly through the flow diverter and then to the first impellers, wherein the vertically extending portion of the flow diverter has a plurality of discharge ports including at least two discharge ports that form an obtuse angle and that direct fluid flow to the outer half of the impeller blades, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead, a well bore, and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a working fluid that can be pumped into the production tubing, a flow channel in the well bore that enables the working fluid to be circulated via the production tubing to the tool body at a location in the well and then back to the wellhead area, a flow diverter carried in the tool body and positioned to receive flow from the flow channel, the flow diverter including a disk and a vertically extending portion attached to the disk and having a generally vertically oriented flow bore, a pumping mechanism on the tool body, the pumping mechanism including first impellers that are driven by the working fluid and second impellers that are rotated by the first impellers, the second impellers pumping oil from the well via the tool body, wherein the vertically extending portion of the flow diverter has a plurality of discharge ports including at least two discharge ports that form an obtuse angle and that direct fluid flow to the impellers, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     In one embodiment, the impellers include upper and lower pairs of impellers, each upper impeller connected to and rotating with a lower impeller. 
     In one embodiment, the working fluid is water. 
     In one embodiment, the working fluid is oil. 
     In one embodiment, the working fluid is a mixture of water and a material that is not water. 
     The present invention includes an oil pump apparatus for pumping oil from an oil well having a wellhead, a well bore, casing, and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a working fluid that can be pumped into the production tubing, a flow channel in the well bore that enables the working fluid to be circulated via the production tubing to the tool body at a location in the well and then back to the wellhead area, a pumping mechanism on the tool body, the pumping mechanism including one or more upper impellers that are driven by the working fluid and one or more lower impellers that are rotated by the upper impellers, the lower impellers pumping oil from the well via the tool body, each impeller having a top and a bottom, a diverter that extends along the upper impellers and having one or more discharge openings that discharge the working fluid to the upper impeller at a position in between the top and bottom of the upper impeller, wherein the tool body has flow conveying portions that mix the working fluid and the oil as the oil is pumped, and wherein the pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area. 
     In one embodiment, the working fluid is water or oil or a mixture of water and another material that is not water. 
     The present invention provides an oil pump apparatus for pumping oil from an oil well having a wellhead and a well bore with casing and a production tubing string, comprising a tool body that is sized and shaped to be lowered into the production tubing string of an oil well, a casing and production tubing, a working fluid that can be pumped into the production tubing, a prime mover for pumping the working fluid, a flow channel in the well bore that enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area, a pumping mechanism on the tool body, the pumping mechanism including an upper impeller device that is driven by the working fluid and a lower impeller device that is powered by the first impeller device, the lower impeller device pumping oil from the well via the tool body, and a diverter that extends along the upper impellers and having one or more discharge openings that discharge the working fluid to the upper impeller at a position in between the top and bottom of the upper impeller. 
     The present invention provides an oil well pumping apparatus for pumping oil from a well to a wellhead provides a tool body that is sized and shaped to be lowered into the production tubing string of the oil well. A working fluid is provided that can be pumped into the production tubing. A prime mover is provided for pumping the working fluid. A flow channel into the well bore enables the working fluid to be circulated from the prime mover via the production tubing to the tool body at a location in the well and then back to the wellhead area. A pumping mechanism is provided on the tool body, the pumping mechanism includes upper and lower spur gear or gears. The upper spur gear is driven by the working fluid. The lower spur gear is rotated by the first spur gear. The upper and lower spur gears are connected with a common shaft. If upper pairs and lower pairs of spur gears are employed, each upper and lower gear are connected via a common shaft. The tool body has flow conveying portions that mix the working fluid and the produced oil as the oil is pumped. The pumping mechanism transmits the commingled fluid of oil and working fluid to the wellhead area where they are separated and the working fluid recycled. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       For a further understanding of the nature, objects, and advantages of the present invention, reference should be had to the following detailed description, read in conjunction with the following drawings, wherein like reference numerals denote like elements and wherein: 
         FIG. 1  is a perspective view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 2  is a sectional view taken along lines  2 - 2  of  FIG. 1 ; 
         FIG. 3  is a sectional view taken along lines  3 - 3  of  FIG. 1 ; 
         FIG. 4  is a sectional view taken along lines  4 - 4  of  FIG. 1 ; 
         FIG. 5  is a sectional view taken along lines  5 - 5  of  FIG. 1 ; 
         FIG. 6  is a sectional view taken along lines  6 - 6  of  FIG. 1 ; 
         FIG. 7  is a sectional view taken along lines  7 - 7  of  FIG. 1 ; 
         FIG. 8  is a fragmentary perspective view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 9  is a sectional view taken along lines  9 - 9  of  FIG. 8 ; 
         FIG. 10  is a sectional view taken along lines  10 - 10  of  FIG. 8 ; 
         FIG. 11  is a sectional view taken along lines  11 - 11  of  FIG. 8 ; 
         FIG. 12  is an exploded perspective view of a preferred embodiment of the apparatus of the present invention; 
         FIGS. 12A-12B  are fragmentary views illustrating the gears or impellers; 
         FIG. 12C  is a sectional view taken along lines  12 C- 12 C of  FIG. 12A ; 
         FIG. 12D  is a sectional view taken along lines  12 D- 12 D of  FIG. 12A ; 
         FIG. 12E  is a sectional view taken along lines  12 E- 12 E of  FIG. 12B ; 
         FIG. 12F  is a sectional view taken along lines  12 F- 12 F of  FIG. 12B ; 
         FIG. 13  is a sectional elevation view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 14  is a sectional view taken along lines  14 - 14  of  FIG. 13 ; 
         FIG. 15  is a sectional view taken along lines  15 - 15  of  FIG. 13 ; 
         FIG. 16  is a sectional elevation view of a preferred embodiment of the apparatus of the present invention; 
         FIGS. 17-21  are sectional elevation views of a preferred embodiment of the apparatus of the present invention and wherein lines A-A of  FIGS. 17-18  are match lines, lines B-B of  FIGS. 18-19  are match lines, lines C-C of  FIGS. 19-20  are match lines, and lines D-D of  FIGS. 20-21  are match lines; 
         FIG. 22  is a fragmentary perspective view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 23  is a sectional view taken along lines  23 - 23  of  FIG. 22 ; 
         FIG. 24  is a sectional view taken along lines  24 - 24  of  FIG. 22 ; 
         FIG. 25  is a sectional view taken along lines  25 - 25  of  FIG. 22 ; 
         FIG. 26  is a partial sectional elevation view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 27  is a partial sectional elevation view of a preferred embodiment of the apparatus of the present invention; 
         FIG. 28  is a schematic diagram showing operation of the apparatus and method of the present invention in a pumping position; 
         FIG. 29  is a schematic diagram showing operation of the apparatus and method of the present invention in a retrieval position; and 
         FIG. 30  is a schematic diagram showing operation of the apparatus and method of the present invention in a neutral position. 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Oil well pump apparatus as shown in  FIGS. 1-30 , designated generally by the numeral  10 . Oil well pump  10  is to be used in a well casing  11  that surrounds production tubing  12 . A packer  13  is set in between casing  11  and production tubing  12  as shown in  FIGS. 21 and 28 . Landing nipple or seating nipple  14  is positioned above packer  13 . The landing nipple  14  receives the lower end portion  17  of tool body  15  as shown in  FIGS. 17-21 and 29 . Tool body  15  has upper end portion  16 . Tool body  15  can be pumped hydraulically or lowered into the production tubing  12  bore  18  using a work string (not shown) that grips neck portion  25  at tool body  15  upper end  16 . Neck portion  25  can have annular shoulder  56  for assisting in forming a connection with a work string (see  FIG. 17 ). 
     The apparatus  10  of the present invention provides an oil well pump  10  that has a tool body  15  that is elongated to fit inside of the bore  18  of production tubing  12  as shown in  FIGS. 17-21 . A well annulus  19  is that space in between casing  11  and production tubing  12 . During use, a working fluid such as water, “lease” water, or an oil water mixture can be used to power pump mechanism  26  (see  FIGS. 28-30 ). This working fluid follows the path that is generally designated by the arrows  49 ,  50  in  FIG. 16 . The working fluid is pumped from the wellhead area using a prime mover  121 . 
     The prime mover  121  can be a commercially available pump (e.g., positive displacement pump) that receives working fluid via flowline  122  from reservoir  123  at wellhead area  120 . Reservoir  123  is supplied with the working fluid such as water via flowline  124  that exits oil/water separator  125  (see  FIGS. 28-30 ). 
     In the pumping mode of  FIG. 28 , working fluid (e.g., water) moves from the reservoir  123  to the prime mover  121 . The prime mover  121  can be a positive displacement pump that pumps the working fluid through three way valve  130 . In the pumping mode, three way valve  130  handle  131  is in the down position as shown in  FIG. 28 , allowing the working fluid or power fluid into the tubing  12 . The working fluid pumps the tool body  15  into the seating nipple  14  and then provided swab cups or a seal or seals  57 . If swab cups are used, they flare outwardly sealing against the tubing  12 . In either case (swab cups or seal) a seal  57  causes the power fluid to then enter the channels  58  at the upper end  16  of the tool body  15  (see  FIGS. 17, 28 ). The working fluid travels through bore  60  of tool section  47  and the center of the stacked disk upper filter  59  into the top or upper end  21  of pump housing section  20  of tool body  15 . The upper impellers  27 ,  28  rotate and, in turn, cause the shafts  42 ,  43  to rotate which causes the lower impellers  29 ,  30  to turn (see  FIGS. 13, 17-20, 26-28 ). 
     When the lower impellers  29 ,  30  turn, they pump produced oil into the well casing annulus  19  (see arrows  53 ,  54  in  FIG. 16 ; see also  FIGS. 26-28 ).  FIGS. 17-21  show the flow of working fluid (arrows  127 ) and oil (arrows  129 ). In annulus  19 , the oil commingles with the working fluid and returns to the surface (see arrows  129 ,  127  in  FIG. 28 ). At the surface or wellhead  120 , the oil and water (working fluid) enters flow line  126  (arrows  127 ) and is transmitted to oil/water separator  125 . Separator  125  separates produced oil into a selected storage tank via flow line  128  (see arrow  129 ) and recirculates the power fluid into the reservoir to complete the cycle. 
     In the retrieval mode of  FIG. 29 , working fluid moves from the reservoir  123  to the prime mover  121 . The positive displacement prime mover  121  pumps the working fluid through the three way valve  130 . In the retrieval mode, the three way valve handle  131  is in an upper position (as shown in  FIG. 29 ) that allows the working fluid to enter the casing annulus  19 . 
     The working fluid enters the perforated production tubing  12  but does not pass the packer  13 . This working fluid that travels in the annulus  19  flares a swab cup or seal  57  against the production tubing  12  causing a seal. The tool body  15  can provide check valves  101 ,  102  to prevent circulation of the working fluid through the tool body  15  to the oil producing formation that is below packer  13  (see  FIGS. 17, 21 and 29 ). This arrangement causes the tool body  15  to lift upward and return to the wellhead  120  where it can be removed using an overshot. In  FIG. 29 , the tool body  15  can thus be pumped to the surface or wellhead area  120  for servicing or replacement. The power fluid or working fluid circulates through the three way valve  130  to the oil separator  125  and then to the reservoir  123  completing the cycle. 
     In  FIG. 30 , a neutral mode is shown. When the tool body  15  is captured with an overshot, for example, the three way valve  130  is placed in a middle or neutral position as shown in  FIG. 30 . The  FIG. 30  configuration causes the power fluid or working fluid to circulate through the three way valve  130  and directly to the separator  125  and then back to the reservoir  123 . The configuration of  FIG. 30  produces substantially zero pressure on the tubing  12 . A hammer union can be loosened to remove the tool body  15  and release the overshot. The tool body  15  can be removed for servicing or replacement. A replacement pump can then be placed in the tubing  12  bore  18 . A well operator then replaces the hammer union and places the handle  131  of the three way valve  130  in the down position of  FIG. 28 . The tool body  15  is then pumped to the seating nipple  14  as shown in  FIG. 28 , seating in the seating nipple  14  so that oil production can commence. 
     In  FIGS. 1, 6-7, 12-21  the housing  20  provides an upper end portion  21  having internal threads  22  that enable a connection to be made with upper retainer  32 . Housing  20  provides a lower end portion  23  having internal threads  24  that enable a connection to be made with external threads of lower retainer  33 . 
     Pump mechanism  26  ( FIGS. 12-16 and 19 ) provides a plurality of impellers or spur gears. These impellers or spur gears include an upper pair of spur gears  27 ,  28  and a lower pair of spur gears  29 ,  30 . Flow diverter structure  31  (see  FIGS. 9-16, 19, 22-27 ) is positioned above gears  27 ,  28 , held in place with a retainer  32 . Lower retainer  33  and lower bearing  35  are positioned below lower gears  29 ,  30 . Gears  27 ,  28  are held within upper cavity  36 . Gears  29 ,  30  are held within lower cavity  37  (see  FIGS. 6-7 ). The pair of upper spur gears  27 ,  28  are contained within upper cavity  36  of housing  20 . The lower spur gears  29 ,  30  are contained in the lower cavity  37  of pump mechanism housing section  20 . 
     Locking pins can be used to prevent disassembly of either of the retainers  32 ,  33  from pump mechanism housing  20 . Longitudinally extending slots or slotted openings  38 ,  39  are provided in pump housing section  20  as shown in  FIGS. 1, 3, 5-7, 12 and 16 . Shaft openings  40 ,  41  are provided in housing section  20  and communicating in between upper cavity  36  and lower cavity  37  (see  FIGS. 12-13 ). The shaft openings  40 ,  41  enable shafts  42 ,  43  to extend between upper spur gear  27 , and lower spur gear  29  (see  FIGS. 12, 12A-12F and 13 ). In  FIGS. 12, 12A-12F and 13 , upper spur gear  27  is connected to lower spur gear  29  with shafts  42 ,  43 . Upper spur gear  28  does not have to be connected to lower spur gear  30  with a shaft (see  FIG. 12B ). The upper spur gear  27  rotates with lower spur gear  29 . The gears  28 ,  30  rotate, driven by the gears  27 ,  29 . Each gear  27 ,  28  has circumferentially spaced, radially extending teeth  46 . The teeth  46  of spur gear  27  engage the teeth  46  of spur gear  28  as seen in  FIG. 14 . Similarly, the teeth  46  of spur gear  29  engage the teeth of spur gear  30  (see  FIG. 15 ). Thus gear  27  rotates and drives rotator gear  28 . Gear  29  rotates and drives/rotates gear  30 . 
     Each shaft  42 ,  43  has a generally cylindrically shaped section  44  and a splined section  45 . The cylindrically shaped section  44  of each shaft  42 ,  43  is connected to a bearing  34  or  35  as shown in  FIGS. 12, 13 . The splined sections  45  of each shaft  42 ,  43  interlock to connect one section  45  (of shaft  42 ) to the other splined section  45  of shaft  43  as seen in  FIGS. 12A-12F . Each of the spur gears  27 - 30  can have the same number of longitudinally extending and radially extending, circumferentially spaced apart teeth  46  as shown in  FIGS. 12-16 . Each gear  27 - 30  is contained within a shaped section of cavity  36  or  37  (see  FIGS. 6-7 ). 
       FIGS. 12A-12F  show the impellers or spur gears  27 - 30  in more detail. Spur gear  27  has an upper end portion that provides cylindrically shaped section  99 . Similarly, the spur gear  29  provides a lower end portion having a cylindrically shaped section  99 . Each of the spur gears  28 ,  30  has end portions that are cylindrically shaped. The spur gear or impeller  28  has cylindrically shaped end portions  100 . Similarly, the spur gear or impeller  30  has cylindrically shaped sections  100 . The cylindrically shaped sections  99  are part of shaft  42 ,  43  as shown in  FIG. 12A . Similarly, the cylindrically shaped sections  100  of impellers  28 ,  30  are parts of shaft  43 . The lower end portion of shaft  43 , cylindrically shaped section  99  rests in a cylindrically shaped opening  41  of lower bearing/shaft support  35  (see  FIG. 13 ). The upper end portion  99  of spur gear  27  is placed in shaft opening  40  of diverter structure  31  or  31 A. Each of the splined sections  45  and cylindrically shaped sections  44  of shafts  42 ,  43  occupy a cylindrically shaped opening  98  that is in the transverse plate  79  section of body  20  (see  FIGS. 4-8, 12-14 ). The lower end portion of shaft  43  which is cylindrically shaped section  100  also occupies a cylindrically shaped opening  98  as shown in  FIGS. 3-4 and 12-13 . The upper end portion of impeller or gear  30  provides cylindrically shaped section  100  that also occupies cylindrically shaped opening  98  of body  20  as shown in  FIGS. 3-7, 13 . Notice in  FIG. 13  that the shafts  43  of spur gears  28  and  30  do not necessarily have to meet. There can be a gap there between as shown in  FIG. 13 . In this fashion, the spur gear  27  rotates with and drives the spur gear  28 . Similarly, the spur gear  29  rotates with and drives the spur gear  30 . 
     Each of the upper and lower cavities  36 ,  37  provides a section that is shaped to hold diverter structure  31 .  FIGS. 8-16 and 19  show the diverter structure  31  in more detail. Diverter structure  31  has an upper end portion  61  connected to lower end portion  62  at joint  63 . Upper end portion  61  is in the form of a disk or upper bearing  34  as shown in  FIGS. 8, 9 and 11 . The disk  34  has upper surface  64  and lower surface  65 . Internally threaded opening  66  is provided on disk  34  at upper surface  64  as shown in  FIGS. 8-9 and 11 . The internally threaded opening  66  enables the diverter structure  31  to be removed for servicing or replacement. An externally threaded shaft or tool can be connected to the internally threaded opening  66  for enabling the diverter structure  31  to be lifted upwardly from pump housing section  20 . Diverter structure  61  has a vertical or longitudinal section  68  having an internal flow channel  67 . The flow channel  67  communicates with channel opening  48  as shown in  FIGS. 8-9 and 11 . 
     Ports are provided for discharging fluid from the vertical or longitudinal section  68 . The ports  69 ,  70  discharge fluid in opposing directions as indicated by the reference lines  72  and  73  at  FIG. 10 . These ports  69 , 70  are thus angularly oriented, preferably forming an obtuse angle which would be the angle between the reference lines  72  and  73  in  FIG. 10 . 
     Flow channel  67  has a lower or closed end  71 . Therefore, when the working fluid reaches the diverter structure  31 , it enters the channel  67  by way of opening  48 . Flow in channel  67  is discharged through the ports  69  and  70  as illustrated by the arrows  74 ,  75  in  FIG. 14 . In this fashion, the working fluid discharged through port  69  engages the teeth  46  of impeller  27 . The flow discharged from channel  67  through port  70  engages the teeth  46  of impeller  28  (see  FIGS. 11, 12 and 13 ). 
     Diverter structure  31  vertical or longitudinal section  68  has a rear surface  76  and a front surface  77 . The front surface  77  is part of a dam  78  that prevents working fluid from flowing to the interface or interlock at  95  of the impellers  27 ,  28  (see  FIGS. 10, 14 ). The gears are impellers  27 ,  28  thus rotate in the direction of arrows  74 ,  75  respectively as shown in  FIG. 14 . 
     Pump housing section  20  provides a transverse plate  79  that segregates or separates the upper and lower cavities  36 ,  37  as shown in  FIGS. 2-7, 13 and 16 . The pump housing section  20  can be provided with flat surfaces at  80 ,  81 , and  82  (see  FIGS. 2-5 ). The flat surfaces  81 ,  82  can be tool receptive surfaces for enabling a user to rotate the pump housing section  20  relative to the tool body section  15  such as during assembly or disassembly with other parts such as those shown in  FIG. 12 . 
     Each of the upper and lower cavities  36 ,  37  has three lobes or partial cylindrical sections. For example, in  FIGS. 2-3 , there can be seen partial cylindrical sections  83 ,  84 ,  85  which are a part of upper cavity  36 . In  FIG. 5 , the lower cavity  37  is comprised of three partial cylindrical sections  86 ,  87 ,  88 . In the upper cavity  36 , each of the lobes  84 ,  85  carries a spur gear or impeller  26  or  27 . The lobe or portion cylindrical section  83  carries the vertical or longitudinal section  68  of diverter structure  31 . In lower cavity  37 , each of the lobes or partial cylindrical sections  87 ,  88  carries a spur gear or impeller  29  or  30 . The lobe or partial cylindrical section  86  provides a channel for the transport of oil to be pumped as illustrated by arrows  53  and  54  in  FIG. 16 . 
     The oil to be pumped travels upwardly as it is pumped by the rotating impellers  29 ,  30 . The direction of the lower impellers  29 ,  30  can be seen in  FIG. 15  and marked with the arrows  96 ,  97 . 
     Lower bearing  35  has a pair of spaced apart shaft openings  41  through a receptive of the shafts  43  of impellers  29  and  30  (see  FIG. 13 ). 
     Lower retainer  33  has an opening  90  through which oil flows as illustrated by the arrow  53  in  FIG. 16 . Lower bearing  35  provides a flow opening  89  through which oil can flow in order to reach the impellers  29 ,  30  as shown in  FIG. 13, 16 . 
     An alternate embodiment of the diverter structure is seen in  FIGS. 22-27 , designated by the numeral  31 A. In  FIGS. 22-27 , the diverter structure  31 A provides a structure that is basically the same as the diverter structure  31 , the difference being the provision of a beveled annular surface  92  on a frusto conical disk  91  and a correspondingly shaped beveled annular surface  132  on housing  20 A. The disk  91  provides the same opening  48 , shaft openings  40 , and vertical/longitudinal section  68  as the diverter structure  31  with flow channel  67  and ports  69 ,  70 . In  FIGS. 23 and 25 , the frusto conical disk  91  has beveled angular surface  92  which forms an angle  93  that is an acute angle with upper surface  64 . Internally threaded opening  94  accepts a threaded tool (e.g. bolt) for removing diverter  31 A from pump housing body  20 A. 
     Influent working fluid travels from influent channel opening  48  downwardly in the direction of arrows  49 ,  50  in  FIG. 16 . This influent fluid that follows arrows  49 ,  50  is the working fluid, the same working fluid described with respect to  FIGS. 28-30 . The working fluid travels in the direction of arrows  49 ,  50  from rear section of upper cavity  36  and through upper spur gears  27 ,  28  as indicated by arrow  49 ,  50  in  FIG. 16 . This fluid flow rotates the gear  27  in the direction of arrow  51  and the gear  28  in the direction of arrow  52  as shown in  FIGS. 14, 15 . This rotation of the upper gears  27 ,  28  also rotates the lower gears  29 ,  30 . 
     Oil to be pumped travels in the direction of arrows  53 ,  54  into oil inlet opening/perforation  55  and into the rear section of lower cavity  37  and through the gears  29 ,  30 . The flowing working fluid which follows the direction of arrows  49 ,  50  in  FIG. 16  exits the upper cavity  36  via upper slot  38 . The oil being pumped travels in the direction of arrows  53 ,  54  and exits lower slot  39 , mixing with the working fluid. The working fluid and oil pass through perforations  55 , returning to the surface area via annulus  19  (see arrows  127 ). 
     The following is a list of suitable parts and materials for the various elements of a preferred embodiment of the present invention. 
     
       
         
               
             
               
               
             
           
               
                   
               
               
                 PARTS LIST 
               
             
          
           
               
                 Part Number 
                 Description 
               
               
                   
               
               
                 10 
                 oil well pump apparatus 
               
               
                 11 
                 well casing 
               
               
                 12 
                 production tubing 
               
               
                 13 
                 packer 
               
               
                 14 
                 landing/seating nipple 
               
               
                 15 
                 tool body 
               
               
                 16 
                 upper end portion 
               
               
                 17 
                 lower end portion 
               
               
                 18 
                 bore 
               
               
                 19 
                 well annulus 
               
               
                 20 
                 pump housing section 
               
               
                     20A 
                 housing 
               
               
                 21 
                 upper end portion 
               
               
                 22 
                 internal threads 
               
               
                 23 
                 lower end portion 
               
               
                 24 
                 internal threads 
               
               
                 25 
                 neck 
               
               
                 26 
                 pump mechanism 
               
               
                 27 
                 impeller/spur gear, upper 
               
               
                 28 
                 impeller/spur gear, upper 
               
               
                 29 
                 impeller/spur gear, lower 
               
               
                 30 
                 impeller/spur gear, lower 
               
               
                 31 
                 diverter structure 
               
               
                     31A 
                 diverter structure 
               
               
                 32 
                 retainer, upper 
               
               
                 33 
                 retainer, lower 
               
               
                 34 
                 disk/upper bearing 
               
               
                 35 
                 lower bearing/shaft support 
               
               
                 36 
                 upper cavity 
               
               
                 37 
                 lower cavity 
               
               
                 38 
                 slot/slotted opening 
               
               
                 39 
                 slot/slotted opening 
               
               
                 40 
                 shaft opening 
               
               
                 41 
                 shaft opening 
               
               
                 42 
                 shaft 
               
               
                 43 
                 shaft 
               
               
                 44 
                 cylindrically shaped section 
               
               
                 45 
                 splined section 
               
               
                 46 
                 teeth 
               
               
                 47 
                 tool section 
               
               
                 48 
                 channel opening 
               
               
                 49 
                 arrow 
               
               
                 50 
                 arrow 
               
               
                 51 
                 arrow 
               
               
                 52 
                 arrow 
               
               
                 53 
                 arrow 
               
               
                 54 
                 arrow 
               
               
                 55 
                 perforation/inlet opening 
               
               
                 56 
                 annular shoulder 
               
               
                 57 
                 seal 
               
               
                 58 
                 channel 
               
               
                 59 
                 stacked disk filter 
               
               
                 60 
                 bore 
               
               
                 61 
                 upper end portion 
               
               
                 62 
                 lower end portion 
               
               
                 63 
                 joint 
               
               
                 64 
                 upper surface 
               
               
                 65 
                 lower surface 
               
               
                 66 
                 internally threaded opening 
               
               
                 67 
                 flow channel 
               
               
                 68 
                 vertical/longitudinal section 
               
               
                 69 
                 port 
               
               
                 70 
                 port 
               
               
                 71 
                 closed end of channel 
               
               
                 72 
                 reference line 
               
               
                 73 
                 reference line 
               
               
                 74 
                 arrow 
               
               
                 75 
                 arrow 
               
               
                 76 
                 rear surface 
               
               
                 77 
                 front surface 
               
               
                 78 
                 dam 
               
               
                 79 
                 transverse plate 
               
               
                 80 
                 flat surface 
               
               
                 81 
                 flat surface 
               
               
                 82 
                 flat surface 
               
               
                 83 
                 lobe/partial cylindrical section 
               
               
                 84 
                 lobe/partial cylindrical section 
               
               
                 85 
                 lobe/partial cylindrical section 
               
               
                 86 
                 lobe/partial cylindrical section 
               
               
                 87 
                 lobe/partial cylindrical section 
               
               
                 88 
                 lobe/partial cylindrical section 
               
               
                 89 
                 opening 
               
               
                 90 
                 opening 
               
               
                 91 
                 frusto conical disk 
               
               
                 92 
                 beveled annular surface 
               
               
                 93 
                 angle 
               
               
                 94 
                 internally threaded opening 
               
               
                 95 
                 interface/interlock 
               
               
                 96 
                 arrow 
               
               
                 97 
                 arrow 
               
               
                 98 
                 cylindrically shaped opening 
               
               
                 99 
                 cylindrically shaped section 
               
               
                 100  
                 cylindrically shaped section 
               
               
                 101  
                 check valve 
               
               
                 102  
                 check valve 
               
               
                 120  
                 wellhead area 
               
               
                 121  
                 prime mover 
               
               
                 122  
                 flowline 
               
               
                 123  
                 reservoir 
               
               
                 124  
                 flowline 
               
               
                 125  
                 separator 
               
               
                 126  
                 flowline 
               
               
                 127  
                 arrow 
               
               
                 128  
                 flowline 
               
               
                 129  
                 arrow 
               
               
                 130  
                 three way valve 
               
               
                 131  
                 handle 
               
               
                 132  
                 beveled annular surface 
               
               
                   
               
             
          
         
       
     
     The foregoing embodiments are presented by way of example only; the scope of the present invention is to be limited only by the following claims.