U.S. patent application number 12/088693 was filed with the patent office on 2009-02-12 for downhole electric driven pump unit.
This patent application is currently assigned to Anatoly Konstantinovich PONOMAREV. Invention is credited to Aleksandr Nikolaevich Antonnikov, Anatoly Konstantinovich Ponomarev.
Application Number | 20090041596 12/088693 |
Document ID | / |
Family ID | 37906389 |
Filed Date | 2009-02-12 |
United States Patent
Application |
20090041596 |
Kind Code |
A1 |
Ponomarev; Anatoly Konstantinovich
; et al. |
February 12, 2009 |
Downhole Electric Driven Pump Unit
Abstract
A downhole electric driven pump unit for oil production
comprises a submersible electric motor (1), a driven oil pump (2),
a working plunger pump (4), an oil tank (7) provided with a
secondary oil filter (8), an oil volume expansion compensator (9)
and a hydraulic engine (10). Above-piston and under-piston cavities
(11, 12) of the hydraulic engine cylinder (13) are connected to the
oil pump suction and discharge sides (15, 16) through a distributor
(14). The hydraulic engine piston (17) is connected to the plunger
(18) of the working pump. The electric motor is provided with a
protector (19) and is cinematically linked with the driven pump
shaft by means of the protector shaft. The working pump cylinder
(20) is provided with a sealed cylindrical diaphragm (21) made of
elastic material such that oil filled cavity (22) is formed. The
working pump plunger (18) is mounted such that it is
reciprocatingly displaceable in the cavity (22). A pressure valve
(31) is arranged above the discharge valve (6) such that a cavity
(23) is formed. The compensator (6) is in the form of a cylinder
(24) provided with a cylindrical diaphragm (25) which is placed
therein such that an internal sealed cavity (26) communicating with
the oil tank (7) and an annular cavity (27) is formed. Said
invention makes it possible to increase the performance factor and
reliability of the unit.
Inventors: |
Ponomarev; Anatoly
Konstantinovich; (Moscow, RU) ; Antonnikov; Aleksandr
Nikolaevich; (Strezhevoi, RU) |
Correspondence
Address: |
PATENTTM.US
P. O. BOX 82788
PORTLAND
OR
97282-0788
US
|
Assignee: |
PONOMAREV; Anatoly
Konstantinovich
Moscow
RU
ANTONNIKOV; Aleksandr Nikolaevich
Tyumenskaya obl., g. Strezhevoi
RU
MOISEEV; Vladimir Vladimirovich
Moscow
RU
EGOROV; Yuri Ivanovich
Moscow
RU
|
Family ID: |
37906389 |
Appl. No.: |
12/088693 |
Filed: |
July 24, 2006 |
PCT Filed: |
July 24, 2006 |
PCT NO: |
PCT/RU2006/000393 |
371 Date: |
March 31, 2008 |
Current U.S.
Class: |
417/375 |
Current CPC
Class: |
F04B 47/08 20130101;
E21B 43/128 20130101 |
Class at
Publication: |
417/375 |
International
Class: |
F04B 47/08 20060101
F04B047/08 |
Foreign Application Data
Date |
Code |
Application Number |
Oct 3, 2005 |
RU |
2005130527 |
Claims
1. The electric hydraulically actuated well pump consisting of a
submersible electric motor, engine-driven oil pump, plunger working
pump with suction and pressure valves, oil tank with fine media oil
filters, oil expansion joint and hydraulic motor, and head-piston
and bottom-piston cylinder chambers, which are connected through
the control valve to the suction and pressure sides of the oil
pump, (the latter of which is equipped with a safety valve), and a
hydraulic motor piston connected to the working pump plunger is
unique in that the electric motor is equipped with a protector, the
shaft of which kinematically connects the electric motor shaft to
the shaft of the engine-driven oil pump. An axial piston pump is
used as the engine-driven oil pump, and the plunger working pump
cylinder is equipped with a hermetic cylindrical flexible
diaphragm, which forms a chamber filled with oil. The working pump
plunger is capable of reciprocal motion within this chamber, and a
lift valve is installed over the plunger working pump pressure
valve to form a chamber. The oil expansion joint is made in the
form of a cylinder, within which is a flexible cylindrical
diaphragm forming an internal hermetic chamber connected to the oil
tank and an annular chamber surrounding the flexible diaphragm. The
oil expansion joint cylinder is equipped with suction and pressure
valves; the suction valve is connected on its inlet side with the
external space around the pump, and the pressure valve is connected
on its exit side by means of a pipe with the chamber between the
plunger working pump pressure valve and the lift valve.
2. The electric hydraulically actuated well pump under Clause 1 is
unique in that the pump is equipped with additional suction valves
placed coaxially in the cylinder walls of the plunger working pump
and oil expansion joint in one or multiple rows.
Description
[0001] The invention applies to the field of mechanical
engineering, particularly to well pumps for extracting oil.
PREVIOUS TECHNOLOGY
[0002] Electric hydraulically actuated diaphragm well pump for
extracting oil (see Patent RU No. 2062906, Class F 04 B 47/06, Jun.
27, 1996).
[0003] The known design has shortcomings of low efficiency, short
service life for the flexible plane diaphragm due to high stroke
frequency, low pump lift performance, inability to extract oil with
low water cut due to the suction valves' poor carrying
capacity.
[0004] The closest technical solution is the electric hydraulically
actuated well pump consisting of a submersible electric motor,
engine-driven oil pump, plunger working pump with suction and
pressure valves, oil tank with fine media oil filters, oil
expansion joint and hydraulic motor. Head-piston and bottom-piston
cylinder chambers of the hydraulic motor are connected through the
control valve to the suction and pressure sides of the oil pump
(the latter of which is equipped with a safety valve), and a
hydraulic motor piston connected to the working pump plunger (see
Patent RU No. 2166668, Class F 04 B 47/08, May 10, 2001). The
drawback of this design is wear and tear of the working pump
plunger seals, which decreases the pump's capacity and lift
performance.
DISCLOSURE OF INVENTION
[0005] The invention is intended to solve the problem of increasing
working pump service life and pump lift performance and capacity.
The technical result achieved by solving said problem is increasing
efficiency and operating reliability of the electric hydraulically
actuated well pump.
[0006] The stated problem is solved and the technical result is
achieved due to the fact that the electric hydraulically actuated
well pump consists of a submersible electric motor, engine-driven
oil pump, plunger working pump with suction and pressure valves,
oil tank with fine media oil filters, oil expansion joint and
hydraulic motor. Head-piston and bottom-piston cylinder chambers of
the hydraulic motor are connected through the control valve to the
suction and pressure sides of the oil pump, (the latter of which is
equipped with a safety valve), and the hydraulic motor piston is
connected to the working pump plunger. The electric motor is
equipped with a protector, the shaft of which kinematically
connects the electric motor shaft to the shaft of the engine-driven
oil pump. An axial piston pump is used as the engine-driven oil
pump, and the plunger working pump cylinder is equipped with a
hermetic cylindrical flexible diaphragm, which forms a chamber
filled with oil. The working pump plunger is capable of reciprocal
motion within this chamber, and a lift valve is installed over the
plunger working pump pressure valve to form a chamber. The oil
expansion joint is made in the form of a cylinder, within which is
a flexible cylindrical diaphragm forming an internal hermetic
chamber connected to the oil tank and an annular chamber
surrounding the flexible diaphragm. The oil expansion joint
cylinder is equipped with suction and pressure valves; the suction
valve is connected on its inlet side with the external space around
the pump, and the pressure valve is connected on its exit side by
means of a pipe with the chamber between the plunger working pump
pressure valve and the lift valve.
[0007] The pump can be equipped with additional suction valves,
which can be placed coaxially in the cylinder walls of the plunger
working pump and oil expansion joint in one or multiple rows.
Making the oil expansion joint with suction and pressure valves and
connecting it to the chamber between the working pump pressure
valve and the lift valves doubles the pump's capacity by pumping
oil on the hydraulic motor piston's reciprocal stroke, avoids wear
and tear on the working pump plunger seals (as they operate in oil
and do not directly contact the pump medium), and increases the
pump's lift performance. The pump end effector is a cylindrical
diaphragm made of a flexible material such as rubber reinforced
with glass fiber or Kevlar, which increases the membrane's
durability. The plunger working pump end effector is a hermetic
oil-filled chamber bounded by a cylindrical flexible diaphragm,
within which the plunger moves reciprocally; this decreases the
cyclical load on the diaphragm (as compared with the diaphragm pump
indicated above) and thereby increases the plunger working pump's
operating reliability. Another advantage of the proposed technical
solution is that the pump lift performance and capacity can vary
widely by changing the working pump plunger diameter.
[0008] Making the pump with additional suction valves increases the
pump's carrying capacity and makes the pump design more compact,
which is particularly important for installations used in
wells.
BRIEF DESCRIPTION OF DESIGNS
[0009] FIG. 1 shows a longitudinal section of the electric
hydraulically actuated well pump.
[0010] FIG. 2 shows the variant of suction valve made with
additional suction valves for the electric hydraulically actuated
well pump, using the plunger working pump cylinder with suction
valves as an example.
PREFERRED EMBODIMENT OF INVENTION
[0011] The electric hydraulically actuated well pump consists of
submersible electric motor 1, engine-driven oil pump 2, plunger
working pump 4 with suction 5 and pressure 6 valves, oil tank 7
with fine media oil filters 8, oil expansion joint 9 and hydraulic
motor 10, and head-piston 11 and bottom-piston 12 chambers of
cylinder 13, which are connected through control valve 14 to the
suction 15 and pressure 16 sides of oil pump 2, (the latter of
which is equipped with safety valve 3), and piston 17 of hydraulic
motor 10 is connected to plunger 18 of working pump 4. Electric
motor 1 is equipped with protector 19, the shaft of which
kinematically connects the shaft of electric motor 1 to the shaft
of engine-driven oil pump 2. An axial piston pump is used as
engine-driven oil pump 2, and cylinder 20 of plunger working pump 4
is equipped with hermetic cylindrical flexible diaphragm 21, which
forms chamber 22 filled with oil in cylinder 20. Plunger 18 of
working pump 4 is capable of reciprocal motion within chamber 22.
Lift valve 31 is installed over pressure valve 6 of plunger working
pump 4 to form chamber 23. Oil expansion joint 9 is made in the
form of cylinder 24, within which is flexible cylindrical diaphragm
25 forming internal hermetic chamber 26 connected to oil tank 7 and
annular chamber 27 surrounding flexible diaphragm 25. Cylinder 24
of oil expansion joint 9 is equipped with suction 28 and pressure
29 valves; suction valve 28 is connected on its inlet side with the
external space around the pump, and pressure valve 29 is connected
on its exit side by means of pipe 30 with chamber 23 between
pressure valve 6 of plunger working pump 4 and lift valve 31. The
electric hydraulically actuated well pump is installed on
production string 32.
[0012] The pump can be equipped with additional suction valves 5
and 28; suction valves 5 and 28 can be placed coaxially in the
walls of cylinders 20 and 24 of plunger working pump 4 and oil
expansion joint 9, respectively, in one or multiple rows.
[0013] Control valve 14 is connected by pipe 33 and channel 34,
respectively, to head-piston chamber 11 and rod-piston chamber 12
of cylinder 13 of hydraulic motor 10.
[0014] The mechanical position switch of control valve 14 consists
of push rod 35 and stop 36 with spring 37.
[0015] The oil leaks through the seals from chamber 22 return to
oil tank 7 through pipe 38.
[0016] Production string 32 with the pump assembly is lowered into
the casing string, which is sunk into the well. Power is supplied
to the submersible electric motor through cable 39, which is
attached to production string 32 by clamps (not shown). The
electric hydraulically actuated well pump operates as follows.
[0017] Upon submersion of the pump into the well, the chambers of
electric motor 1 with protector 19 and the hydraulic drive system
are filled with filtered oil in accordance with the operating
temperature specification.
[0018] Upon submersion of the pump in the oil reservoir, the
extracted fluid flows into the chambers of cylinders 24 and 20
through suction valves 28 and 5, respectively. Under hydrostatic
pressure, pressure valves 29 and 6 and lift valve 31 open and the
fluid fills production string 32 to the reservoir level.
[0019] When electric motor 1 is engaged, engine-driven oil pump 2
begins to operate, supplying oil through control valve 14 to one of
the chambers of cylinder 13 of hydraulic motor 10.
[0020] If the oil is fed beneath piston 17, plunger 18 moves
upward, filling oil chamber 22 and stretching diaphragm 21 under
oil pressure, thereby forcing the fluid out of cylinder 20 through
pressure valve 6 into chamber 23 and further through lift valve 31
into production string 32. When piston 17 moves upward, the oil in
chamber 26 of oil expansion joint 9 decreases by the volume of
plunger 18 issuing from cylinder 13 of hydraulic motor 10;
therefore, the fluid from suction valve or valves 28 fills chamber
27 of cylinder 24 of expansion joint 9.
[0021] The difference between the volume flow of the oil pumped
into and expelled by cylinder 13 of hydraulic motor 10 caused by
plunger 18 in head-piston chamber 11 is compensated by changing the
volume of oil in oil tank 4 and chamber 26 of expansion joint 9,
limited by diaphragm 25.
[0022] When piston 17 of hydraulic motor 10 moves downward, the
volume of oil under diaphragm 25 in chamber 26 increases and the
fluid from cylinder 24 moves into production string 32 through
pressure valve 29, pipe 30 and lift valve 31.
[0023] Cylinder 20 of plunger working pump 4 simultaneously fills
with fluid from suction valve or valves 5. When piston 17 of the
hydraulic motor reaches the defined upper or lower position, the
switch of control valve 14 engages, and the reciprocal stroke is
completed and the operating cycle described above repeats.
[0024] Control valve 14 is switched upon movement of piston 17 by
the action of push rod 35 on the control valve at the piston's
extreme positions. Stop 36 with spring 37 prevents the control
valve from `sticking` in the middle position because the spring is
compressed, holding a certain potential energy, so that it
overcomes the stop's resistance and moves push rod 35 and thereby
the valve into one of the extreme positions.
[0025] The mechanical switch can also have other variations both
alone and in combination with the hydraulic control valve
commanding the main control valve.
[0026] Upon reduction of the dynamic level of well fluid, the
security clearance is established at submersible electric motor 1
control station for the electric current corresponding to the
maximum allowable level according to the pump depth and power
shutoff.
[0027] Otherwise, the pump is stocked with an electric motor with
regulated revolutions per minute, which are reduced with lower
dynamic level and correspondingly lower pump capacity, controlled
by an annulus pressure sensor installed in the electric motor.
INDUSTRIAL APPLICABILITY
[0028] The invention can be used in the oil extraction industry and
other industries where fluids are extracted from wells.
* * * * *