U.S. patent application number 15/291250 was filed with the patent office on 2018-04-12 for jet pump lift system for producing hydrocarbon fluids.
The applicant listed for this patent is Weatherford Technology Holdings, LLC. Invention is credited to Manish AGARWAL, Jeffrey John LEMBCKE.
Application Number | 20180100382 15/291250 |
Document ID | / |
Family ID | 60083144 |
Filed Date | 2018-04-12 |
United States Patent
Application |
20180100382 |
Kind Code |
A1 |
AGARWAL; Manish ; et
al. |
April 12, 2018 |
JET PUMP LIFT SYSTEM FOR PRODUCING HYDROCARBON FLUIDS
Abstract
A jet pump lift system for use with a tubing disposed in a
casing includes a jet pump installed in the tubing; a one way valve
for communicating a power fluid into the jet pump; and a safety
valve configured to block fluid communication through the tubing
and disposed above the jet pump.
Inventors: |
AGARWAL; Manish; (Cypress,
TX) ; LEMBCKE; Jeffrey John; (Cypress, TX) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Weatherford Technology Holdings, LLC |
Houston |
TX |
US |
|
|
Family ID: |
60083144 |
Appl. No.: |
15/291250 |
Filed: |
October 12, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
E21B 33/12 20130101;
E21B 34/08 20130101; E21B 23/03 20130101; E21B 34/10 20130101; E21B
2200/05 20200501; E21B 34/06 20130101; E21B 43/124 20130101 |
International
Class: |
E21B 43/12 20060101
E21B043/12; E21B 34/08 20060101 E21B034/08 |
Claims
1. A jet pump lift system for use with a tubing disposed in a
casing, comprising: a jet pump installed in the tubing; a one way
valve for communicating a power fluid into the jet pump; and a
safety valve configured to block fluid communication through the
tubing and disposed above the jet pump.
2. The system of claim 1, wherein the one way valve comprises a
check valve.
3. The system of claim 1, wherein the safety valve comprises a
flapper valve.
4. The system of claim 1, wherein the one way valve allows fluid
communication from an annular area between the tubing and the
casing to the jet pump.
5. The system of claim 1, wherein the one way valve is positioned
below the safety valve.
6. The system of claim 1, wherein the safety valve is positioned at
a depth of 3,000 ft. or less.
7. The system of claim 6, wherein the one way valve is positioned
at a depth of 6,000 ft. or more.
8. The system of claim 1, wherein the one way valve is positioned
at a depth of 6,000 ft. or more.
9. The system of claim 1, further comprising an annular packer
located below the one way valve.
10. The system of claim 1, wherein the one way valve is installed
in a side pocket of the tubing.
11. A method of producing hydrocarbon fluids, comprising;
installing a jet pump in a production tubular; maintaining a safety
valve located above the jet pump in an open position; supplying a
power fluid through a one way valve and into the jet pump; urging a
production fluid into the jet pump; and flowing the production
fluid and the power fluid past the safety valve.
12. The method of claim 11, wherein the production tubular is
disposed in a casing, and the power fluid is supplied down an
annular area between the production tubular and the casing.
13. The method of claim 12, wherein the one way valve controls
power fluid flow into the production tubular.
14. The method of claim 11, wherein the power fluid flows into the
jet pump via a side port.
15. The method of claim 11, wherein the safety valve comprises a
flapper valve.
16. The method of claim 11, wherein the one way valve comprises a
check valve.
17. The method of claim 11, wherein the safety valve is located a
depth of 3,000 ft. or less.
Description
BACKGROUND OF THE INVENTION
Field of the Invention
[0001] Embodiments of the present invention generally relate to
artificially lifting fluid from a wellbore. More particularly,
embodiments of the present invention relate to artificially lifting
fluid from a wellbore using a jet pump lift system.
Description of the Related Art
[0002] To obtain hydrocarbon fluids from an earth formation, a
wellbore is drilled into the earth to intersect an area of interest
within a formation. The wellbore may then be "completed" by
inserting casing within the wellbore and setting the casing therein
using cement. In the alternative, the wellbore may remain uncased
(an "open hole wellbore"), or may become only partially cased.
Regardless of the form of the wellbore, production tubing is
typically run into the wellbore primarily to convey production
fluid (e.g., hydrocarbon fluid, which may also include water) from
the area of interest within the wellbore to the surface of the
wellbore.
[0003] Often, pressure within the wellbore is insufficient to cause
the production fluid to naturally rise through the production
tubing to the surface of the wellbore. Thus, to carry the
production fluid from the area of interest within the wellbore to
the surface of the wellbore, artificial lift means is sometimes
necessary.
[0004] Some artificially-lifted wells are equipped with sucker rod
lifting systems. Sucker rod lifting systems generally include a
surface drive mechanism, a sucker rod string, and a downhole
positive displacement pump. Fluid is brought to the surface of the
wellbore by pumping action of the downhole pump, as dictated by the
drive mechanism attached to the rod string.
[0005] One type of sucker rod lifting system is a rotary positive
displacement pump, typically termed a progressive cavity pump
("PCP"). The progressive cavity pump lifts production fluid by a
rotor disposed within a stator. The rotor rotates relative to the
stator by use of a sucker rod string.
[0006] An additional type of sucker rod lifting system is a rod
lift system, with which fluid is brought to the surface of the
wellbore by reciprocating pumping action of the drive mechanism
attached to the rod string. Reciprocating pumping action moves a
traveling valve on the positive displacement pump, loading it on
the down-stroke of the rod string and lifting fluid to the surface
on the up-stroke of the rod string.
[0007] Sucker rod lifting systems include several moving mechanical
components. Specifically, the rod strings of sucker rod lifting
systems must be reciprocated or rotated to operate the lifting
systems. In some applications, the moving parts are
disadvantageous. When a subsurface safety valve is employed within
the wellbore, such as within an offshore well, a sucker rod string
cannot be placed through the subsurface safety valve. Additionally,
moving parts are susceptible to failure or damage, potentially
causing the sucker rod lifting systems to become inoperable.
[0008] An alternative lift system involves using a jet pump. As
shown in FIG. 1, a production tubing 10 having a jet pump 20 is
installed in a casing 15. The jet pump 20 includes a nozzle
section, a venturi section, and inlets ports in fluid communication
with the venturi section. A ported sub 22 fluidly connects the
bottom of the venturi section with the annular area between the
tubing 10 and the casing 15. Production fluid flowing up the tubing
10 can flow into the venturi section via the inlet ports.
[0009] In operation, power fluid is directed down the tubing 10
toward the nozzle section of the jet pump 20. Power fluid exiting
the nozzle section is directed through the venturi section. As the
power fluid passes from the nozzle section to the venturi section,
production fluid is drawn into the venturi section via the inlet
ports. The combined power fluid and production fluid leave the
venturi section via the ported sub 22 and enter the annular area,
where the combined fluids flow upward to the surface.
[0010] In many of these operations, a safety valve is attached to a
landing nipple 23 disposed below the jet pump 20. The safety valve
serves as a safety barrier for both the tubing 10 and the casing 15
by blocking communication through the bore of the tubing 10. In
some instances, the jet pump is installed at depths of 8,000 ft. or
more. Because the safety valve is below the jet pump, the safety
valve must be rated for use at these depths. The safety valves
required for these depths are usually much more expensive than
safety valves rated for use at shallower depths; in some instances,
more than double or triple the costs. The cost associated with
control lines for operating the safety valves also increase with
depth.
[0011] There is, therefore a need for an improved lift system for
producing hydrocarbon fluids. There is also need for a lift system
that allows a safety valve to be installed above a jet pump.
SUMMARY OF THE INVENTION
[0012] In one embodiment, a jet pump lift system for use with a
tubing disposed in a casing includes a jet pump installed in the
tubing; a one way valve for communicating a power fluid into the
jet pump; and a safety valve configured to block fluid
communication through the tubing and disposed above the jet
pump.
[0013] In another embodiment, a method of producing hydrocarbon
fluids includes installing a jet pump in a production tubular;
maintaining a safety valve located above the jet pump in an open
position; supplying a power fluid through a one way valve and into
the jet pump; urging a production fluid into the jet pump; and
flowing the production fluid and the power fluid past the safety
valve.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] So that the manner in which the above recited features of
the present invention can be understood in detail, a more
particular description of the invention, briefly summarized above,
may be had by reference to embodiments, some of which are
illustrated in the appended drawings. It is to be noted, however,
that the appended drawings illustrate only typical embodiments of
this invention and are therefore not to be considered limiting of
its scope, for the invention may admit to other equally effective
embodiments.
[0015] FIG. 1 shows a prior art artificial lift system using a jet
pump.
[0016] FIG. 2 shows an exemplary artificial lift system using a jet
pump and a one way valve.
[0017] FIG. 2A is an enlarged partial view of the lift system of
FIG. 2.
[0018] FIG. 3 illustrates an exemplary embodiment of a one way
valve.
DETAILED DESCRIPTION
[0019] Embodiments of the present disclosure relate to an
artificial lift system using a jet pump and a one-way valve for
fluid communication between the jet pump and a power fluid source.
In one aspect, the jet pump driven system advantageously allows a
safety valve to be installed above the jet pump.
[0020] FIG. 2 shows an exemplary artificial lift system for
producing a hydrocarbon fluid. FIG. 2A is an enlarged partial view
of FIG. 2. A jet pump 120 is installed in a production tubing 110
disposed in a casing 115. A packer 117 blocks the annular area
between the tubing 110 and the casing 115 below the jet pump
120.
[0021] The jet pump 120 includes a tubular housing 121 having an
inlet located at a lower end and an outlet located at an upper end.
The outer surface of the two ends of the tubular housing 121
sealingly engages the inner surface of the bore of the tubing 110.
In this respect, production fluid flowing up the bore is directed
into the inlet of the housing 121. In one embodiment, the ends may
be sealed using one or more sealing members 111 such as o-rings and
chevron seals.
[0022] An annular chamber 118 is defined between the two sealed
ends and between the tubing 110 and the housing 121 of the jet pump
120. A one way valve 160 is used to control fluid communication
between the annular chamber 118 and the annular area 113 between
the tubing 110 and the casing 115. The one way valve 160 is
configured to allow fluid in the annular area 113 to flow into the
annular chamber 118. In this respect, the one way valve 160
prevents pressure increases, such as a blow-out condition, from
being communicated into the casing 115. An exemplary one way valve
is a check valve. It is contemplated that a single or a plurality
of one way valves may be used to communication fluid into the
annular chamber 118. In one example, the one way valve 160 can be
located at any location between the jet pump and the power fluid
source. In another example, the one way valve 160 is located below
the valve 180, as shown in FIG. 2. In yet another example, the one
way valve 160 is located at a depth between 6,000 ft. and 30,000
ft., such as between 8,000 ft. and 20,000 ft. In a further example,
the one way valve is located at a depth between 6,000 ft. and the
depth of perforation.
[0023] In one embodiment, the jet pump 120 is installed in a tubing
110 having a side pocket mandrel 114, as disclosed in U.S. Pat. No.
7,228,909, which patent is incorporated by reference, in
particular, FIGS. 1, 2A, 2B, 3, and 5, and the corresponding
description.
[0024] FIG. 3 illustrate an exemplary embodiment of a one way valve
335 suitable for use with a side pocket of the tubing. The one way
valve 335 includes a tubular body 305 having a generally
longitudinal central bore 336 therethrough and having an upper end
301 and a lower end 302. The lower end 302 includes an outlet port
313 for ejecting fluid from the bore 336, and the upper end 301
includes a connector for connecting the one way valve to a latching
mechanism for retrieval. The tubular body 305 includes two inlet
ports 331A, 331B fluidly connecting the central bore 336 to the
outside of the one way valve 335. Seal assemblies 328, 329 form a
seal path for the fluid to enter the inlet ports 331A, 331B. A
first ball and seat mechanism 340 is used to control fluid
communication between the inlet ports 331A, 331B and the bore 336.
When the fluid outside the one way valve 335 reaches a
predetermined level, the ball will be urged away from the seat,
thereby allowing fluid, such as power fluid P, to flow into the
bore 336. A second ball and seat mechanism 350 is disposed in the
body 305 between the first ball and seat mechanism 340 and the
outlet port 313. The second ball and seat mechanism 350 allows
fluid flow from the inlet ports 331A, 331B to the outlet port 350,
but does not allow fluid flow in the opposite direction.
[0025] Referring back to FIGS. 2 and 2A, the jet pump 120 includes
a nozzle section 122 spaced apart from a venturi section 124. The
spaced area 125 between the nozzle section 122 and the venturi
section 124 fluidly communicates with the bore of housing 121. This
arrangement allows fluid flowing through the inlet of the housing
121 to flow toward the venturi section 124. A side port 126 formed
in the tubular housing 121 provides fluid communication between the
annular chamber 118 and the interior of the nozzle section 122. The
nozzle section 122 includes a throat 128 having an inwardly tapered
portion that increases the velocity of the power fluid flowing out
of the nozzle section 122. The venturi section 124 is configured to
receive power fluid from the nozzle section 122 and the production
fluid. The venturi section 124 includes an outwardly tapered
portion 129 that increases the pressure of the combined fluids
flowing out of the venturi section 124 while decreasing the
velocity of the combined fluids. Exemplary power fluids include
water, oil, hydrocarbon, and combinations thereof.
[0026] A safety valve 180 is installed in the tubing 110 and above
the jet pump 120. In one embodiment, the safety valve 180 includes
a flapper 181 movable between an open position and a closed
position. The flapper 181 is operated by a flow tube 182 controlled
by a control line. As shown, the flapper 181 is maintained in the
open position by the flow tube 182. To close the flapper 181,
pressure is supplied through the control line to move the flow tube
182 upward, thereby freeing the flapper 181 to pivot into the bore
of the tubing 110 to block fluid communication through the bore. To
open the flapper 181, pressure is supplied through the control line
to move the flow tube 182 downward, thereby pivoting the flapper
181 away from the bore to open fluid communication through the
bore.
[0027] In operation, production fluid 141 in the tubing 110 flows
upward and enters the jet pump 120 via the inlet of the tubular
housing 121. Power fluid 142 is supplied down the annular area 113
between the tubing 110 and the casing 115 toward the jet pump 120.
The power fluid 142 then passes through the one way valve 160 and
enters the annular chamber 118. The power fluid 142 flows through
the side port 126 toward the throat 128 of the nozzle section 122.
As the power fluid 142 is forced through the throat 128, the
velocity of the power fluid 142 is increased. The power fluid 142
exiting the throat 128 passes through the spaced area 125 and
enters the venturi section 124. As the power fluid passes from the
nozzle section 122 to the venturi section 124, production fluid 141
in the spaced area 125 is drawn into the venturi section 124. The
combined fluids 141, 142 then flow through the outwardly tapered
portion 129, where the velocity of the combined fluids is decreased
and the pressure is increased. The combined fluids 141, 142 flows
out of the jet pump 120 and up the tubing 110. The flapper 181 is
retained in the open position to allow the combined fluids 141, 142
to flow to the surface.
[0028] As discussed, embodiments of the jet pump lift system
advantageously allow the safety valve to be installed above the jet
pump. Because the one way valve prevents fluid communication from
the tubing 110 into annular area 113 with the casing 115, the
safety valve only needs to block fluid communication up the tubing
110. In one example, the safety valve is located at 3,000 ft. or
above, such as between 200 ft. and 2,500 ft., between 1,000 ft. and
2,000 ft., and 2,000 ft. or above. Safety valves rated for these
depths cost substantially less than safety valves rated for much
lower depths, such as between 8,000 ft. and 20,000 ft.
[0029] Any directional terms used in the description above are
merely illustrative, for example, the terms "upward", "downward",
etc., and not limiting. It is understood that the production tubing
described above is usable within any orientation of wellbore,
including but not limited to a vertical, horizontal,
directionally-drilled, or lateral wellbore.
[0030] While the foregoing is directed to embodiments of the
present invention, other and further embodiments of the invention
may be devised without departing from the basic scope thereof, and
the scope thereof is determined by the claims that follow.
* * * * *