US2283118A - Deep well pump assembly - Google Patents

Description

May l2, 1,942.A A. ARu-ruNoFF DEEP WELL PUMP ASSEMBLY Filed May 22, 1940 2 Sheets-Sheet l 'INVENTOR ,4wd/.5 ,4m/#waff IIIIl ay 12, 1942. A ARUTUNOFF 2,283,118

DEEP wELL PUMP ASSEMBLY Filed May 22, 1940 2 sheets-sheet 2 T m f r QJ MM E 1:1. r l 7 Si; r j, E

Patented May 12, 1942 TENT FEC

DEEP WELL PUMP ASSEMBLY mais Aruumea, Bartlesville, okla., esslgner te Reda Pump Company, Bartlesville, Okla., a.

corporation of Delaware 7 Claims.

My invention relates to a deep well pump assembly and more particularly to a novel assembly for pumping uids from deep wells such as oil wells and the like.

In many areas, after the gas pressure in a field has been depleted, oil must be removed by pumping. At present, there are two types of pumpingequipment available. One is known as the Reda pump which comprises a multi-stage centrifugal pump and motor assembly. The assembly is adapted to be lowered into the well and to pump oil out of the WelPWithOut--the necessity of using a long string of sucker rods. The instant invention is particularly adapted to this type of equipment. The other type of pumping equipment available comprises a reciprocating pump which is actuated through a string of sucker rods operated Vby any suitable'means such as a motor driven walking beam. The pumping of oil with sucker rods has many disadvantages. The cost of a string of rods and the time consumed in placing the rods and removing them when it is necessary to replace valves and the like is considerable. Sucker rods frequently break, resulting in the shutting down of pumping operations and the necessity of shing for the broken rod string. The power consumed in reciprocating a long string of rods is so 'much waste in so far as the removal of oil from the well is concerned.

In deep oil wells, the temperature is elevated above atmospheric temperature and the work done by' the motor in a motor pump assembly, such as the Reda, generates heat. The heating of the motor may result in failures in insulation, necessitating the removal of the unit from the well. I

One object of my invention is to provide a novel motor pump assembly in which the fluid being pumped is used to cool oil in an oil reservoir communicating with the motor so that the motor will be at once lubricated and cooled by heat exchange with the eduction oil being pumped.

Other and further objects of my invention will appear from the following description. In the accompanying drawings which form part of the instant specification and are to be4 read in conjunction therewith and in which like reference numerals are used to indicate like parts in the various views;

Figure l isa side elevation, with parts broken away, of a motor pump assembly showing one embodiment of my invention.

Figure 2 is a sectional elevation, on an enlarged scale, of the upper portion of the assembly shown in Figure 1..

Figure 3 is an enlarged sectional view of the l portion of the assembly shown in Figure 1, which is below that shown in Figure 2.

Figure 4'is a sectional view takenon the line scale, of the assembly shown in Figure 5, taken just below the sectional view shown in Figure 6.

Figure 8 is a sectional view taken on the line 8 8 of Figure 7.

More particularly referring now to the drawings, a motor section I is coupled to a pump section 2, the entire assembly being lowered into a well. The motor section I contains an electric motor, to which power is supplied through a cable 3. Oil being pumped by the pump flows upwardly through tubing 6. 1n the form shown in Figure 2, tubing communicates with a heat exchange coil 5, which conducts the oil into a passageway 6 which communicates with an eduction tubing l. The heat exchange coil 5 is lodged in a housing 8 which forms a reservoir for oil 9.

The oil reservoir communicates with the interior of the motor housing I through a plurality of ducts I0 as can readily be seen by reference to Figures 3 and 4. The motor housing contains a laminated stator II, provided with a winding I2. The rotor I3 is secured to the motor shaft It. Oil is adapted to circulate around the motor armature I3 and through the duct I5 formed in the shaft I. Oil 9 in housing 8 will rise by convection as the temperature rises and will be cooled by heat exchange with the eduction iluid being pumped through heat exchange coil 5. In this manner, the oil acts not only as a lubricant for the motor bearings but also acts as a cooling agent to keep the'motor cool, the heat being ultimately removed from the well with the eduction fluid.

Referring'now to Figure 5, I have shown another form of my invention, in which the heat exchange coil 5 is replaced with a tube I6 with which the'eduction pipe 4 communicates. The pipe I6 is lodged within the housing 8, forming an annular oil reservoir for oil 9 therewith and permitting heat exchange to take place between the oil 9 and the eduction uid being pumped. As can readily be seen by reference to Figure 6, the upper end of the' housing 8, in the form of the invention shown ln Figures 5, 6, '7 and 8, ls provided with a stuiilng box I1, which seals the oil reservoir. Due to the fact that the tempera.- ture of the eduction fluid may vary over wide llmits, some provision must be made for expansion of the heat exchange tube carrying the eduction fluid. In Figure 2, it will be noted that a spiral tube 5 is provided, forming a helical coil which is suliiciently resilient in and of itself to accommodate the expansion caused by changes of temperature.

In Figure 6, the heat exchange tube I5 may Yexpand by sliding movement through the stumng box E'I. It Will be appreciated that, in a deep well, it is highly important that the lubricating oil and heat exchange medium 9 must not become contaminated by the fluid being pumped.

It will be seen that I have accomplished the p objects of my invention. I haveprovided a method of lubricating and cooling the motor for a deep well pump assembly which Will enable the temperature of the motor to be kept at all times within normal limits, avoiding the danger ,of

raising the temperature to a point at which both efficiency is reduced and danger of rupturing the insulation exists.

It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other features and sub-combinations. This is contemplated by and is within the scope of my claims. It is further obvious that various changes may be made in details within the 'scope of my claims without v departing from the spirit of my invention. It is,

therefore, to be understood that my invention is not to be limited to the specic details shown and described.

Having thus described my invention, I claim;

1. In a deep well motor pump assembly having an electric motor and a pump driven thereby, an oil reservoir adapted to contain alubricating oil arranged above the motor and in direct communication therewith so that the lubricating fluids in the motor will circulate through the reservoir by convection, a heat exchange tube in said oil reservoir, and means for passing they iiuid being pumped through said heat exchange tube to cool the oil in said oil reservoir.

2. In a deep well motor pump assembly having an electric motor and a pump driven thereby, anoil reservoir adapted to contain a lubricating oil, means providing communication between said oil reservoir and said motor, the arrangement being such that the motor heat will create convection currents vin the lubricating fluids of the l motor and cause the same to circulate through the said reservoir, a heat exchange tube in said oil reservoir, and means for passing the fluid being pumped through said heat exchange tube to cool the oil in said oil reservoir, said heat exchange tube being provided With means to accommodate expansion thereof due to temperature changes.

3. In a deep well motor pump assembly having an electric motor and 'a pump driven thereby, an oil reservoir adapted to vcontain a lubricating oil, means providing communication between said oil reservoir and said motor, the arrangement being such that heat generated by the motor will create convection currents in the lubricating fluids of the motor and cause the same to circulate through the said reservoir, a. heat exchange tube in said oil reservoir, and means for passing the fluid being pumped through said heat exchange tube to cool the oil in said oil reservoir, said heat exchange tube having a loop to accommodate for expansion and contraction thereof due to temperature changes.

4,. In a deep well motor pump assembly having an electric motor and a pump driven thereby, an oil reservoir adapted to contain a lubricating oils, means providing communication between said oil reservoir and said motor, the arrangement being such that heat generated by the motor will create convection currents in the lubricating fluids of the motor and cause the same to circulate through the said reservoir, a heat exchange tube in said oil reservoir, and means for passing the :duid being pumped through said heat exchange tube to cool the oil in said oil reservoir, said heat exchange tube being formed in a spiral to permit accommodation for expansion and contraction thereof due to temperature changes.

5. In a deep well motor pump assembly having anl electric motor and a pump driven thereby, an oil reservoir adapted to contain a lubricating oil, means providing communication between said oil reservoir and said motor, a heat exchange tube in said oil reservoir, and means for passing the fluid being pumped through said heat exchange tube to cool the oil in said oil reservoir, said heat exchange tube being provided with means-to accommodate for expansion thereof due to temperature changes, said means comprising a stuffing box secured to the upper end of said oil reservoir, said heat exchange tube slidable passing through said stuffing box.

6. In a deep well motor pump assembly, an electric motor having an armature mounted on a rotatable tubular shaft, an oil reservoir at one end of the motor communicating with the motor housing through connecting ducts and with the internal bore of the armature shaft, a heat exchange tube in said oil reservoir, and means for passing the uid being pumped through the heat exchangetube, the arrangement being such that heat ,generated by the 'motor will create convection currents in the fluid filling the motor and reservoir whereby all of the fluid 4in the motor` and reservoir will be chilled by the fluid in the heat exchange tube.

7. In a deep Well motor pump assembly, an electric motor having an armature mounted on a. rotatable tubular shaft, an oil reservoir at one end of the motor communicating with the motor housing through connecting ducts and with the internal bore of the armature shaft, a heat exchange tube in said oil reservoir, said tube being convoluted to substantially ll the reservoir, and means for passing the fluid being pumped through the heat exchange tube, the arrangement being such that heat generated by the motor will create convection currents in the' fluid filling the motor and reservoir whereby the fluid in the motor will flow through the tubular armature shaft into the reservoir, circulate about the heat exchange tube to dissipate its heat, and return in a relatively chilled condition to the motor by way of the said connecting ducts.

ARMAIS ARUTUNOFF.

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