CA2285035A1 - Dual tubing system for producing wells - Google Patents
Dual tubing system for producing wells Download PDFInfo
- Publication number
- CA2285035A1 CA2285035A1 CA 2285035 CA2285035A CA2285035A1 CA 2285035 A1 CA2285035 A1 CA 2285035A1 CA 2285035 CA2285035 CA 2285035 CA 2285035 A CA2285035 A CA 2285035A CA 2285035 A1 CA2285035 A1 CA 2285035A1
- Authority
- CA
- Canada
- Prior art keywords
- drive
- aperture
- pump
- production
- bottom end
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 230000009977 dual effect Effects 0.000 title claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 61
- 239000012530 fluid Substances 0.000 claims abstract description 42
- 210000002445 nipple Anatomy 0.000 claims description 7
- 239000010687 lubricating oil Substances 0.000 claims description 4
- 239000004576 sand Substances 0.000 description 14
- 239000003921 oil Substances 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000005461 lubrication Methods 0.000 description 3
- 238000012856 packing Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/18—Pipes provided with plural fluid passages
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A dual tubing adapter for use in wells producing fluid comprises a Y-block having a top surface and a bottom surface.
A drive aperture extends from the top surface to the bottom surface. A production aperture extends from the top surface to at a mid-point of the drive aperture. Means are provided to connect a pump to the bottom end of the drive aperture such that fluid pumped thereby enters the bottom end of the drive aperture. A drive tubing string is connectable to the top end of the drive aperture, and a production tubing string is connectable to the top end of the production aperture . A seal is operational to prevent fluid pumped by the pump into the bottom end of the drive aperture from reaching the top end of the drive aperture, thereby directing same up through the production aperture. Means to drive the pump passes through the seal and the drive aperture. A system using the adapter is also disclosed.
A drive aperture extends from the top surface to the bottom surface. A production aperture extends from the top surface to at a mid-point of the drive aperture. Means are provided to connect a pump to the bottom end of the drive aperture such that fluid pumped thereby enters the bottom end of the drive aperture. A drive tubing string is connectable to the top end of the drive aperture, and a production tubing string is connectable to the top end of the production aperture . A seal is operational to prevent fluid pumped by the pump into the bottom end of the drive aperture from reaching the top end of the drive aperture, thereby directing same up through the production aperture. Means to drive the pump passes through the seal and the drive aperture. A system using the adapter is also disclosed.
Description
F&K 666-02-01 DUAL TUBING SYSTEM FOR PRODUCING WELLS
This invention is in the field of producing fluid from wells and, in particular, provides a dual tube system for producing fluid from wells.
BACKGROUND
Conventionally, oil is produced from wells by lowering a pump into the producing zone of the well on the end of a string of tubing. The means to drive the pump passes down the inside of the tubing string to the pump and the pump pushes the oil up the inside of this tubing string through the annulus between the drive means and the inside surface of the tubing. The pump drive means is conventionally a series of sucker rods connected by rod boxes to form a rod string. The sucker rods can either act up or down vertically to activate the pump or rotate within the tubing to activate the pump. Hydraulic F&K 666-02-O1 drive pumps are also known, wherein pressurized hydraulic oil passes through one or more conduits on the inside of the tubing string to the pump and the produced oil passes up the inside of the tubing string around the pressurized hydraulic fluid conduits.
Producing a well through the annulus requires a packing seal around the moving sucker rods where the rods enter the tubing string. Such seals are subject to wear and leaks.
to In many oil fields, the fluid produced and pumped to the surface through the inside of the tubing string is a mixture of gas, sand, water and oil. A common problem is encountered when, for any reason, the pump stops and the fluid sits motionless inside the tubing string for any extended length of time. In such cases where considerable sand is being pumped with the fluid, the sand can pack in the annulus between the inside wall of the tubing string and the sucker rods, and essentially lock the sucker rods so that they cannot move to 2o restart production. Fixing this problem often involves pulling the whole production string out of the well, or flushing the well by unseating a bottom hole pump in order to remove the sand from the system. This is a costly and time F&K 666-02-01 consuming process.
Similarly where the drive means is a conduit, the sand may pack so tight that the pump can not exert sufficient pressure to restart the flow.
Conventionally, the sucker rod string supports the weight of the pump rotor in a rotary pump as well as the considerable downwards force exerted by the oil being raised under pressure 1o to the surface. These forces cause the rod string to stretch, and reduce the useful life of the rod string.
ln~here the produced fluid contains sand and water as well as oil, lubrication between the rod boxes and the tubing string is is poor which can cause wear on the tubing from contact with the moving rod boxes. Eventually holes can be worn in the tubing leading to down-hole leaks. The produced fluid also can contain corrosive gases, water and oil which affect the life of the sucker rods.
An improved system which would allow flushing of packed sand without removing the production string from the hole would be beneficial and reduce the cost of producing oil. Such a F&K 666-02-O1 system that removed the need for a packing seal on the production string at the surface would be further beneficial in reducing leaks at the surface. Such a system that improved lubrication between the rod boxes and the tubing wall would be beneficial as well . Such a system that removed or reduced the downward forces exerted on the rod string would be further beneficial.
STJNmA,RY OF THE INVENTION
It is an object of the present invention to provide a system for producing wells which allows flushing of packed sand without removing the production string from the hole. It is a further object of the present invention to provide such a system that removes the need for a packing seal on the production string at the surface. It is a further object of the present invention to provide such a system that improves lubrication between the rod boxes and the tubing wall. It is 2o a further object of the present invention to provide such a system that reduces the downward forces exerted on the rod string. It is a further object of the present invention to F&K 666-02-01 provide such a system that removes the produced fluids from contact with the drive means, thereby substantially reducing corrosion thereof.
The present invention provides a dual tubing adapter for use in wells producing fluid, the adapter providing means to connect a drive means from the inside of one tubing string to a pump and connect the pump output to a separate tubing string.
The present invention also provides a dual tubing system for producing fluid from wells using such an adapter and dual tubing strings.
The invention accomplishes its objects providing in one aspect a dual tubing adapter for use in wells producing fluid comprising a Y-block having a top surface and a bottom surface; a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface; a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture; means to connect a pump to said bottom end of the F&K 666-02-O1 drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture; means to connect a drive tubing string to said top end of the drive aperture; means to connect a production tubing string to said top end of the production aperture; and a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture; wherein said seal and said drive aperture are adapted to accommodate a means to drive said pump passing therethrough.
to In a second aspect the invention provides a dual tubing system for producing fluid from wells comprising a Y-block comprising a top surface and a bottom surface; a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface; a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture; a pump connected to said bottom end of the drive aperture such 2o that fluid pumped thereby enters said bottom end of the drive aperture; a drive tubing string connected to said top end of the drive aperture; a production tubing string connected to said top end of the production aperture; a seal operational F&K 666-02-O1 to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture, said fluid thereby being directed to flow through said production aperture and up said production tubing string;
s and means to drive said pump passing through said drive tubing string, said seal and said drive aperture.
The dual tubing system thereby utilizes two side by side tubing strings in a well casing. Generally the drive tubing 1o string will be threaded into the Y-block and thereby support the Y-block and pump in the desired vertical location in the well. The drive tubing string also houses the pump drive means which could be any known means such as a sucker rod string, either rotating or moving up and down along its axis;
15 one or more conduits carrying pressurized fluid, either liquid or gas; or such other drive means as is appropriate to the pump being used. No produced fluid passes through the annulus between the inside wall of the drive tubing string and the drive means, thereby reducing the diameter of drive tubing 2o required, and removing the possibility that sand or such other foreign material will jam in the annulus and prevent a rod from moving. The drive string may be filled with lubricating oil to prevent wear between rod boxes and the tubing wall.
F&K 666-02-O1 The produced fluid pumped passes to the ground surface through the production tubing string. Since the Y-block is supported in position by the drive tubing string, it is possible to releasably connect the production tubing string to the Y-block, so that it may be disconnected from the surface if it fills with sand and back-flushed to clean out the sand. While a threaded connection might be used, it will generally be advantageous to use a known "sting-in" connection, where the production tubing is slidingly engaged in the Y-block and may be pulled out of such engagement when sufficient force is applied thereto. The sting-in connection will not require rotating the string and the twisting problems associated therewith. The lower end of the production tubing string may be freed so that sand may be flushed out. The production tubing string may then be reconnected to the Y-block without pulling the Y-block from the well.
Alternatively the production tubing string may be flushed in place with an endless tubing unit, as there is no drive string 2o down the center thereof to interfere with the operation.
While the disclosure is addressed to oil wells, it is contemplated that similar application may be had in wells F&K 666-02-O1 producing other fluids such as water.
DESCRIPTION OF THE DRAWINC~38:
While the invention is claimed in the concluding portions hereof, preferred embodiments are provided in the accompanying detailed description which may be best understood in conjunction with the accompanying diagrams where like parts in to each of the several diagrams are labeled with like numbers, and where:
Figure 1 is a side view of an embodiment of a system for use with a stator and rotor type pump;
Figure 2 is a partial section along 2-2 of Figure 1;
Figure 3 is a partial section along 3-3 of Figure 1;
2o Figure 4 is a side view of an embodiment of the adapter used in Figures 1-3;
F&K 666-02-O1 Figure 5 is a sectional view along 5-5 of Figure 4;
Figure 6 is a side view of an embodiment of a system for use with a piston type pump;
Figure 7 is a partial section along 7-7 of Figure 6;
Figure 8 is a partial section along 8-8 of Figure 6;
io Figure 9 is a side view of an embodiment of the adapter used in Figures 6-8;
Figure 10 is a sectional view along 10-10 of Figure 9;
Figure 11 is a side view of an embodiment of a system for use with a hydraulic motor driven pump;
Figure 12 is a partial section along 12-12 of Figure 11;
2o Figure 13 is a partial section along 13-13 of Figure 11;
Figure 14 is a side view of an embodiment of the adapter used in Figures 11-13;
F&K 666-02-O1 Figure 15 is a sectional view along 15-15 of Figure 14;
Figure 16 is an perspective view of the adapter of Figure 4.
DETAILED DESCRIPTION OF THE ILLUSTRATED BMBODINENTS:
A dual tubing adapter for use in wells producing fluid is to illustrated in Figure 16, comprising a Y-block 1 having a top surface 2 and a bottom surface 3. In the illustrated embodiment the top surface 2 is stepped to form an upper top surface 2a and a lower top surface 2b. The Y-block 1 must slide down inside a well casing and so must be kept to a certain size. The stepped top surface 2 provides for connection of the drive tubing 10 and production tubing 11 at different levels so that the connection points are not aligned, thereby providing slightly more room.
2o The Y-block 1 defines a drive aperture 4 extending from a top end 4a thereof at the lower top surface 2b of the Y-block 1 to a bottom end 4b thereof at the bottom surface 3. The Y-F&K 666-02-O1 block 1 also defines a production aperture 5 extending from a top end 5a thereof at the upper top surface 2a to a bottom end 5b at a mid-point of the drive aperture 4.
In the embodiment of Figures 1-5 the pump illustrated is a conventional rotary pump 8 comprising a stator 6 and a rotor 7. Means to connect the pump stator 6 to the bottom end 4a of the drive aperture 4 such that fluid pumped thereby enters the bottom end 4a of the drive aperture 4 is provided by a 1o threaded connection 9. In the illustrated embodiment, there is a short tube 12 threaded into the bottom end 4a of the drive aperture 4, and the stator 6 is in turn threaded onto the short tube 12.
is Means to connect a string of drive tubing 10 to the top end 4a of the drive aperture 4 is provided by a threaded connectionl3. Means to connect a string of production tubing 11 to the top end 5a of the production aperture 5 is provided by a sting-in connection 14 whereby the male member 14a of the 20 sting in connection 14, which is attached to the bottom end of the production tubing 11, slides into the female member 14b of the sting in connection 14, which is essentially the top end 5a of the production aperture 5. Production seals 15, of any F&K 666-02-O1 conventional design, prevent leakage from the sting-in connection 14.
During installation, which is more fully explained below, the pump rotor 7, attached to the end of a drive rod 16, is lowered through the drive aperture 4 and short tube 12 and into proper engagement with the pump stator 6. Two bearings 17 are attached to the drive rod 16 and the lower bearing 17b is supported on a seat nipple 18 at a mid-point of the drive 1o aperture 4 above the bottom end 5b of the production aperture 5. A drive seal 19, of any conventional design, seals the area between the drive rod 16 and the walls of the drive aperture 4, and is operational to prevent fluid pumped by the pump 8 into the bottom end 4b of the drive aperture 4 from reaching the top end 4a of the drive aperture 4. The fluid then is directed into the bottom end 5b of the production aperture 5 and up the production tubing 11 to the surface.
In operation the short tube 12 and stator 6 are threaded into 2o the bottom end 4b of the drive aperture 4 while on the surface. The drive tubing 10 is threaded into the top end 4a of the drive aperture 4 and the Y-block 1, with attached stator 6, is lowered into the well casing on a string of F&K 666-02-O1 drive tubing 10 to the desired vertical location.
Rotor 7 is attached to the bottom of a drive rod 16, and bearing 17 and drive seal 19 are attached to the drive rod 16 s and lowered down the inside of the drive tubing 10. The rotor 7 passes through the drive aperture 4 and engages the stator 6. The bearing 17 and drive seal 19 are attached to the drive rod 16 at the proper vertical location so that the rotor 7 is in proper vertical relationship to the stator 6 when the to bearing 17 contacts the seat nipple 18 and stops.
Finally the male member 14a of the sting in connection 14 is attached to the bottom end of the production tubing 11 and lowered into the well casing on a string of production tubing 1s 11, beside the drive tubing 10. The male member 14a is inserted into the female member 14b of the sting-in connection 14 at the top end 5a of the production aperture 5, completing the assembly.
2o If desired, the drive tubing 10 may be filled with lubricating oil 21, reducing friction between the rod boxes 22, which connect the sections of drive rod 16 to form the string, and the inside walls of the drive tubing 10.
F&K 666-02-O1 As can be seen, the weight of the string of drive rod 16, and the downward force thereon caused by the fluid being forced to the surface, is borne by the seat nipple 18 in the Y-block 1, and thus by the drive tubing 10. Stress on the string of drive rod 16, and stretching thereof, is greatly reduced.
None of the produced fluid contacts the drive rod 16 above the drive seal 19, thereby reducing damage from corrosive gases, sand and so forth.
1o Should sand become packed in the production tubing 11, upward force on the production tubing 11 can unseat the male member 14a from the female member 14b of the sting-in connection 14 so that the production tubing 11 can be flushed out through the open bottom of the male member 14a.
A conventional no-turn device could be added to the system to prevent rotation down-hole if required.
Similarly, the embodiment of Figures 6-10 illustrates the use of the invention with a piston type pump 30. Pump cylinder 31 is threaded into the bottom end 4b of the drive aperture 4 at threaded connection 34. The piston type pump 30 is driven by a piston rod 32 which moves up and down, and passes through F&K 666-02-01 rod seals 35 in the drive aperture 4 . The bottom end of the piston rod 32 is attached to a pump piston 33 which moves up and down with the piston rod 32 and forces oil into the bottom end 4b of the drive aperture 4 and then into the production aperture 5 and up the production tubing 11. In this embodiment, the production tubing 11 is threaded into the top end 5a of the production aperture 5 at threaded connection 37 , showing an alternative to the sting-in connection 14 illustrated in Figure 3.
The piston type pump 30 is assembled to the Y-block 1 at the surface and attached to the drive tubing 10. The top end of the piston rod 32 extends somewhat into the drive tubing 10 and is threaded so that the string of drive rod 16 may be lowered down the inside of the drive tubing 10 and rotated into engagement with the piston rod 32. Similarly the production tubing 11 is lowered and threaded into the top end 5a of the production aperture 5. Again the drive tubing 10 may be filled with lubricating oil 21 to reduce friction.
Figures 11 - 15 illustrate the invention in use with a hydraulically driven pump 50. In this illustration, the top surface of the Y-block 1 is not stepped but flat . The Y-block F&K 666-02-01 1 and pump 50 are assembled at the surface such that hydraulic lines 51 are connected to drive the pump 50, and the fluid produced by the pump will flow into the bottom end 5a of the drive aperture 4 and up the production aperture 5 into the s production tubing 11. The hydraulic lines 51 are attached to hydraulic apertures 53a and 53b through drive aperture block 52, which seals off the drive aperture 4. The assembly is lowered on the drive tubing 10 and then drive conduit 54 is lowered inside the drive tubing 10 and threaded into the top 1o end of hydraulic aperture 53a. Hydraulic fluid to drive the pump 50 flows down the drive conduit 54, through hydraulic aperture 53a and hydraulic line 51a to the pump 50 and then up the return hydraulic line 51b, through hydraulic aperture 53b and back to the surface through the annulus 55 between the 15 drive conduit 54 and the inner wall of the drive tubing 10.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous changes and modifications will readily occur to those skilled in the 2o art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all such suitable changes or modifications in structure or operation which may be resorted to are intended F&K 666-02-01 to fall within the scope of the claimed invention.
This invention is in the field of producing fluid from wells and, in particular, provides a dual tube system for producing fluid from wells.
BACKGROUND
Conventionally, oil is produced from wells by lowering a pump into the producing zone of the well on the end of a string of tubing. The means to drive the pump passes down the inside of the tubing string to the pump and the pump pushes the oil up the inside of this tubing string through the annulus between the drive means and the inside surface of the tubing. The pump drive means is conventionally a series of sucker rods connected by rod boxes to form a rod string. The sucker rods can either act up or down vertically to activate the pump or rotate within the tubing to activate the pump. Hydraulic F&K 666-02-O1 drive pumps are also known, wherein pressurized hydraulic oil passes through one or more conduits on the inside of the tubing string to the pump and the produced oil passes up the inside of the tubing string around the pressurized hydraulic fluid conduits.
Producing a well through the annulus requires a packing seal around the moving sucker rods where the rods enter the tubing string. Such seals are subject to wear and leaks.
to In many oil fields, the fluid produced and pumped to the surface through the inside of the tubing string is a mixture of gas, sand, water and oil. A common problem is encountered when, for any reason, the pump stops and the fluid sits motionless inside the tubing string for any extended length of time. In such cases where considerable sand is being pumped with the fluid, the sand can pack in the annulus between the inside wall of the tubing string and the sucker rods, and essentially lock the sucker rods so that they cannot move to 2o restart production. Fixing this problem often involves pulling the whole production string out of the well, or flushing the well by unseating a bottom hole pump in order to remove the sand from the system. This is a costly and time F&K 666-02-01 consuming process.
Similarly where the drive means is a conduit, the sand may pack so tight that the pump can not exert sufficient pressure to restart the flow.
Conventionally, the sucker rod string supports the weight of the pump rotor in a rotary pump as well as the considerable downwards force exerted by the oil being raised under pressure 1o to the surface. These forces cause the rod string to stretch, and reduce the useful life of the rod string.
ln~here the produced fluid contains sand and water as well as oil, lubrication between the rod boxes and the tubing string is is poor which can cause wear on the tubing from contact with the moving rod boxes. Eventually holes can be worn in the tubing leading to down-hole leaks. The produced fluid also can contain corrosive gases, water and oil which affect the life of the sucker rods.
An improved system which would allow flushing of packed sand without removing the production string from the hole would be beneficial and reduce the cost of producing oil. Such a F&K 666-02-O1 system that removed the need for a packing seal on the production string at the surface would be further beneficial in reducing leaks at the surface. Such a system that improved lubrication between the rod boxes and the tubing wall would be beneficial as well . Such a system that removed or reduced the downward forces exerted on the rod string would be further beneficial.
STJNmA,RY OF THE INVENTION
It is an object of the present invention to provide a system for producing wells which allows flushing of packed sand without removing the production string from the hole. It is a further object of the present invention to provide such a system that removes the need for a packing seal on the production string at the surface. It is a further object of the present invention to provide such a system that improves lubrication between the rod boxes and the tubing wall. It is 2o a further object of the present invention to provide such a system that reduces the downward forces exerted on the rod string. It is a further object of the present invention to F&K 666-02-01 provide such a system that removes the produced fluids from contact with the drive means, thereby substantially reducing corrosion thereof.
The present invention provides a dual tubing adapter for use in wells producing fluid, the adapter providing means to connect a drive means from the inside of one tubing string to a pump and connect the pump output to a separate tubing string.
The present invention also provides a dual tubing system for producing fluid from wells using such an adapter and dual tubing strings.
The invention accomplishes its objects providing in one aspect a dual tubing adapter for use in wells producing fluid comprising a Y-block having a top surface and a bottom surface; a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface; a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture; means to connect a pump to said bottom end of the F&K 666-02-O1 drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture; means to connect a drive tubing string to said top end of the drive aperture; means to connect a production tubing string to said top end of the production aperture; and a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture; wherein said seal and said drive aperture are adapted to accommodate a means to drive said pump passing therethrough.
to In a second aspect the invention provides a dual tubing system for producing fluid from wells comprising a Y-block comprising a top surface and a bottom surface; a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface; a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture; a pump connected to said bottom end of the drive aperture such 2o that fluid pumped thereby enters said bottom end of the drive aperture; a drive tubing string connected to said top end of the drive aperture; a production tubing string connected to said top end of the production aperture; a seal operational F&K 666-02-O1 to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture, said fluid thereby being directed to flow through said production aperture and up said production tubing string;
s and means to drive said pump passing through said drive tubing string, said seal and said drive aperture.
The dual tubing system thereby utilizes two side by side tubing strings in a well casing. Generally the drive tubing 1o string will be threaded into the Y-block and thereby support the Y-block and pump in the desired vertical location in the well. The drive tubing string also houses the pump drive means which could be any known means such as a sucker rod string, either rotating or moving up and down along its axis;
15 one or more conduits carrying pressurized fluid, either liquid or gas; or such other drive means as is appropriate to the pump being used. No produced fluid passes through the annulus between the inside wall of the drive tubing string and the drive means, thereby reducing the diameter of drive tubing 2o required, and removing the possibility that sand or such other foreign material will jam in the annulus and prevent a rod from moving. The drive string may be filled with lubricating oil to prevent wear between rod boxes and the tubing wall.
F&K 666-02-O1 The produced fluid pumped passes to the ground surface through the production tubing string. Since the Y-block is supported in position by the drive tubing string, it is possible to releasably connect the production tubing string to the Y-block, so that it may be disconnected from the surface if it fills with sand and back-flushed to clean out the sand. While a threaded connection might be used, it will generally be advantageous to use a known "sting-in" connection, where the production tubing is slidingly engaged in the Y-block and may be pulled out of such engagement when sufficient force is applied thereto. The sting-in connection will not require rotating the string and the twisting problems associated therewith. The lower end of the production tubing string may be freed so that sand may be flushed out. The production tubing string may then be reconnected to the Y-block without pulling the Y-block from the well.
Alternatively the production tubing string may be flushed in place with an endless tubing unit, as there is no drive string 2o down the center thereof to interfere with the operation.
While the disclosure is addressed to oil wells, it is contemplated that similar application may be had in wells F&K 666-02-O1 producing other fluids such as water.
DESCRIPTION OF THE DRAWINC~38:
While the invention is claimed in the concluding portions hereof, preferred embodiments are provided in the accompanying detailed description which may be best understood in conjunction with the accompanying diagrams where like parts in to each of the several diagrams are labeled with like numbers, and where:
Figure 1 is a side view of an embodiment of a system for use with a stator and rotor type pump;
Figure 2 is a partial section along 2-2 of Figure 1;
Figure 3 is a partial section along 3-3 of Figure 1;
2o Figure 4 is a side view of an embodiment of the adapter used in Figures 1-3;
F&K 666-02-O1 Figure 5 is a sectional view along 5-5 of Figure 4;
Figure 6 is a side view of an embodiment of a system for use with a piston type pump;
Figure 7 is a partial section along 7-7 of Figure 6;
Figure 8 is a partial section along 8-8 of Figure 6;
io Figure 9 is a side view of an embodiment of the adapter used in Figures 6-8;
Figure 10 is a sectional view along 10-10 of Figure 9;
Figure 11 is a side view of an embodiment of a system for use with a hydraulic motor driven pump;
Figure 12 is a partial section along 12-12 of Figure 11;
2o Figure 13 is a partial section along 13-13 of Figure 11;
Figure 14 is a side view of an embodiment of the adapter used in Figures 11-13;
F&K 666-02-O1 Figure 15 is a sectional view along 15-15 of Figure 14;
Figure 16 is an perspective view of the adapter of Figure 4.
DETAILED DESCRIPTION OF THE ILLUSTRATED BMBODINENTS:
A dual tubing adapter for use in wells producing fluid is to illustrated in Figure 16, comprising a Y-block 1 having a top surface 2 and a bottom surface 3. In the illustrated embodiment the top surface 2 is stepped to form an upper top surface 2a and a lower top surface 2b. The Y-block 1 must slide down inside a well casing and so must be kept to a certain size. The stepped top surface 2 provides for connection of the drive tubing 10 and production tubing 11 at different levels so that the connection points are not aligned, thereby providing slightly more room.
2o The Y-block 1 defines a drive aperture 4 extending from a top end 4a thereof at the lower top surface 2b of the Y-block 1 to a bottom end 4b thereof at the bottom surface 3. The Y-F&K 666-02-O1 block 1 also defines a production aperture 5 extending from a top end 5a thereof at the upper top surface 2a to a bottom end 5b at a mid-point of the drive aperture 4.
In the embodiment of Figures 1-5 the pump illustrated is a conventional rotary pump 8 comprising a stator 6 and a rotor 7. Means to connect the pump stator 6 to the bottom end 4a of the drive aperture 4 such that fluid pumped thereby enters the bottom end 4a of the drive aperture 4 is provided by a 1o threaded connection 9. In the illustrated embodiment, there is a short tube 12 threaded into the bottom end 4a of the drive aperture 4, and the stator 6 is in turn threaded onto the short tube 12.
is Means to connect a string of drive tubing 10 to the top end 4a of the drive aperture 4 is provided by a threaded connectionl3. Means to connect a string of production tubing 11 to the top end 5a of the production aperture 5 is provided by a sting-in connection 14 whereby the male member 14a of the 20 sting in connection 14, which is attached to the bottom end of the production tubing 11, slides into the female member 14b of the sting in connection 14, which is essentially the top end 5a of the production aperture 5. Production seals 15, of any F&K 666-02-O1 conventional design, prevent leakage from the sting-in connection 14.
During installation, which is more fully explained below, the pump rotor 7, attached to the end of a drive rod 16, is lowered through the drive aperture 4 and short tube 12 and into proper engagement with the pump stator 6. Two bearings 17 are attached to the drive rod 16 and the lower bearing 17b is supported on a seat nipple 18 at a mid-point of the drive 1o aperture 4 above the bottom end 5b of the production aperture 5. A drive seal 19, of any conventional design, seals the area between the drive rod 16 and the walls of the drive aperture 4, and is operational to prevent fluid pumped by the pump 8 into the bottom end 4b of the drive aperture 4 from reaching the top end 4a of the drive aperture 4. The fluid then is directed into the bottom end 5b of the production aperture 5 and up the production tubing 11 to the surface.
In operation the short tube 12 and stator 6 are threaded into 2o the bottom end 4b of the drive aperture 4 while on the surface. The drive tubing 10 is threaded into the top end 4a of the drive aperture 4 and the Y-block 1, with attached stator 6, is lowered into the well casing on a string of F&K 666-02-O1 drive tubing 10 to the desired vertical location.
Rotor 7 is attached to the bottom of a drive rod 16, and bearing 17 and drive seal 19 are attached to the drive rod 16 s and lowered down the inside of the drive tubing 10. The rotor 7 passes through the drive aperture 4 and engages the stator 6. The bearing 17 and drive seal 19 are attached to the drive rod 16 at the proper vertical location so that the rotor 7 is in proper vertical relationship to the stator 6 when the to bearing 17 contacts the seat nipple 18 and stops.
Finally the male member 14a of the sting in connection 14 is attached to the bottom end of the production tubing 11 and lowered into the well casing on a string of production tubing 1s 11, beside the drive tubing 10. The male member 14a is inserted into the female member 14b of the sting-in connection 14 at the top end 5a of the production aperture 5, completing the assembly.
2o If desired, the drive tubing 10 may be filled with lubricating oil 21, reducing friction between the rod boxes 22, which connect the sections of drive rod 16 to form the string, and the inside walls of the drive tubing 10.
F&K 666-02-O1 As can be seen, the weight of the string of drive rod 16, and the downward force thereon caused by the fluid being forced to the surface, is borne by the seat nipple 18 in the Y-block 1, and thus by the drive tubing 10. Stress on the string of drive rod 16, and stretching thereof, is greatly reduced.
None of the produced fluid contacts the drive rod 16 above the drive seal 19, thereby reducing damage from corrosive gases, sand and so forth.
1o Should sand become packed in the production tubing 11, upward force on the production tubing 11 can unseat the male member 14a from the female member 14b of the sting-in connection 14 so that the production tubing 11 can be flushed out through the open bottom of the male member 14a.
A conventional no-turn device could be added to the system to prevent rotation down-hole if required.
Similarly, the embodiment of Figures 6-10 illustrates the use of the invention with a piston type pump 30. Pump cylinder 31 is threaded into the bottom end 4b of the drive aperture 4 at threaded connection 34. The piston type pump 30 is driven by a piston rod 32 which moves up and down, and passes through F&K 666-02-01 rod seals 35 in the drive aperture 4 . The bottom end of the piston rod 32 is attached to a pump piston 33 which moves up and down with the piston rod 32 and forces oil into the bottom end 4b of the drive aperture 4 and then into the production aperture 5 and up the production tubing 11. In this embodiment, the production tubing 11 is threaded into the top end 5a of the production aperture 5 at threaded connection 37 , showing an alternative to the sting-in connection 14 illustrated in Figure 3.
The piston type pump 30 is assembled to the Y-block 1 at the surface and attached to the drive tubing 10. The top end of the piston rod 32 extends somewhat into the drive tubing 10 and is threaded so that the string of drive rod 16 may be lowered down the inside of the drive tubing 10 and rotated into engagement with the piston rod 32. Similarly the production tubing 11 is lowered and threaded into the top end 5a of the production aperture 5. Again the drive tubing 10 may be filled with lubricating oil 21 to reduce friction.
Figures 11 - 15 illustrate the invention in use with a hydraulically driven pump 50. In this illustration, the top surface of the Y-block 1 is not stepped but flat . The Y-block F&K 666-02-01 1 and pump 50 are assembled at the surface such that hydraulic lines 51 are connected to drive the pump 50, and the fluid produced by the pump will flow into the bottom end 5a of the drive aperture 4 and up the production aperture 5 into the s production tubing 11. The hydraulic lines 51 are attached to hydraulic apertures 53a and 53b through drive aperture block 52, which seals off the drive aperture 4. The assembly is lowered on the drive tubing 10 and then drive conduit 54 is lowered inside the drive tubing 10 and threaded into the top 1o end of hydraulic aperture 53a. Hydraulic fluid to drive the pump 50 flows down the drive conduit 54, through hydraulic aperture 53a and hydraulic line 51a to the pump 50 and then up the return hydraulic line 51b, through hydraulic aperture 53b and back to the surface through the annulus 55 between the 15 drive conduit 54 and the inner wall of the drive tubing 10.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous changes and modifications will readily occur to those skilled in the 2o art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all such suitable changes or modifications in structure or operation which may be resorted to are intended F&K 666-02-01 to fall within the scope of the claimed invention.
Claims (21)
1. A dual tubing adapter for use in wells producing fluid comprising:
a Y-block having a top surface and a bottom surface;
a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface;
a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture;
means to connect a pump to said bottom end of the drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture;
means to connect a drive tubing string to said top end of the drive aperture;
means to connect a production tubing string to said top end of the production aperture; and a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture;
wherein said seal and said drive aperture are adapted to accommodate a means to drive said pump passing therethrough.
a Y-block having a top surface and a bottom surface;
a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface;
a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture;
means to connect a pump to said bottom end of the drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture;
means to connect a drive tubing string to said top end of the drive aperture;
means to connect a production tubing string to said top end of the production aperture; and a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture;
wherein said seal and said drive aperture are adapted to accommodate a means to drive said pump passing therethrough.
2. The invention of Claim 1 wherein said top surface of said Y-block is stepped.
3. The invention of Claim 2 wherein said top end of said production aperture is above said top end of said drive aperture.
4. The invention of Claims 1, 2 or 3 wherein said means to connect a pump comprises a threaded connection.
5. The invention of any of Claims 1 - 4 wherein said means to connect a drive tubing string comprises a threaded connection.
6. The invention of any of Claims 1 - 5 wherein said means to connect a production tubing string comprises a threaded connection.
7. The invention of any of Claims 1 - 5 wherein said means to connect a production tubing string comprises a sting-in connection.
8. The invention of any of Claims 1 - 7 wherein said pump comprises a rotor and a stator.
9. The invention of Claim 8 wherein said stator is connected to said bottom of the drive aperture and wherein said rotor can pass through said drive aperture to engage said stator.
10. The invention of Claim 9 wherein said means to drive a pump comprises a rotatable rod attached to said rotor.
11. The invention of Claim 10 further comprising a bearing attached to said rotatable rod, and wherein said Y-block comprises a seat nipple at a mid-point of said drive aperture above said bottom end of the production aperture, and wherein said bearing is supported by said seat nipple .
12. The invention of any of Claims 1 - 7 wherein said means to drive a pump comprises a push rod adapted to move up and down along its axis within said drive aperture.
13. The invention of Claim 12 wherein said push rod comprises means to attach a rod string down-hole.
14. The invention of any of Claims 1 - 7 wherein said means to drive a pump comprises at least one conduit carrying pressurized fluid.
15. A dual tubing system for producing fluid from wells comprising:
a Y-block comprising a top surface and a bottom surface;
a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface;
a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture;
a pump connected to said bottom end of the drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture;
a drive tubing string connected to said top end of the drive aperture;
a production tubing string connected to said top end of the production aperture;
a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture, said fluid thereby being directed to flow through said production aperture and up said production tubing string; and means to drive said pump passing through said drive tubing string, said seal and said drive aperture.
a Y-block comprising a top surface and a bottom surface;
a drive aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at said bottom surface;
a production aperture defined by said Y-block extending from a top end thereof at said top surface to a bottom end thereof at a mid-point of said drive aperture;
a pump connected to said bottom end of the drive aperture such that fluid pumped thereby enters said bottom end of the drive aperture;
a drive tubing string connected to said top end of the drive aperture;
a production tubing string connected to said top end of the production aperture;
a seal operational to prevent fluid pumped by said pump into said bottom end of the drive aperture from reaching said top end of the drive aperture, said fluid thereby being directed to flow through said production aperture and up said production tubing string; and means to drive said pump passing through said drive tubing string, said seal and said drive aperture.
16. The invention of Claim 15 wherein said means to drive said pump is a rod string.
17. The invention of Claim 16 wherein said drive tubing string is substantially filled with lubricating oil.
18. The invention of Claims 16 or 17 wherein said rod string rotates.
19. The invention of Claim 18 further comprising a bearing attached to said rod string, and wherein said Y-block comprises a seat nipple at a mid-point of said drive aperture above said bottom end of the production aperture, and wherein said bearing is supported by said seat nipple
20. The invention of Claim 16 or 17 wherein said rod string moves up and down along its axis.
21. The invention of Claim 15 wherein said means to drive said pump is at least one conduit carrying pressurized fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2285035 CA2285035A1 (en) | 1999-10-01 | 1999-10-01 | Dual tubing system for producing wells |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2285035 CA2285035A1 (en) | 1999-10-01 | 1999-10-01 | Dual tubing system for producing wells |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2285035A1 true CA2285035A1 (en) | 2001-04-01 |
Family
ID=4164302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2285035 Abandoned CA2285035A1 (en) | 1999-10-01 | 1999-10-01 | Dual tubing system for producing wells |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2285035A1 (en) |
-
1999
- 1999-10-01 CA CA 2285035 patent/CA2285035A1/en not_active Abandoned
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| Date | Code | Title | Description |
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| FZDE | Dead |