CN109025918A - Fixed tubular column changes a layer pumping means - Google Patents
Fixed tubular column changes a layer pumping means Download PDFInfo
- Publication number
- CN109025918A CN109025918A CN201811077785.7A CN201811077785A CN109025918A CN 109025918 A CN109025918 A CN 109025918A CN 201811077785 A CN201811077785 A CN 201811077785A CN 109025918 A CN109025918 A CN 109025918A
- Authority
- CN
- China
- Prior art keywords
- valve
- orbitron
- sealing device
- pass joint
- reversing cover
- 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.)
- Granted
Links
- 238000005086 pumping Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims abstract description 39
- 239000007788 liquid Substances 0.000 claims abstract description 17
- 210000003746 feather Anatomy 0.000 claims abstract description 16
- 238000003780 insertion Methods 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims description 12
- 238000007373 indentation Methods 0.000 claims description 3
- 239000003129 oil well Substances 0.000 abstract description 13
- 239000010410 layer Substances 0.000 description 36
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 7
- 238000011161 development Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/14—Obtaining from a multiple-zone well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/12—Methods or apparatus for controlling the flow of the obtained fluid to or in wells
- E21B43/121—Lifting well fluids
Abstract
A kind of fixed tubular column changes a layer pumping means, including outer cylinder, it is inserted into sealing device, sucker rod, pump barrel, plunger, delivery valve, inlet valve, reversing cover, connecting tube, orbitron, sliding sealing device, inline pass joint, external connection pass joint, block valve, the oil liquid of oil well lower layer can be entered in pump by block valve, the linked hole is closed by sliding sealing device, the oil liquid on oil well upper layer not can enter, it can only pumping lower layer oil liquid, the interior feather key of reversing cover is in the top of the long track of orbitron at this time, when needing to change layer oil pumping, above mention, transfer the top for the short track that sucker rod makes the interior feather key of reversing cover be in orbitron, sliding sealing device cannot reach at the linked hole, the linked hole is in the open state, the oil liquid on oil well upper layer can enter in pump barrel, the body of rod of the lower part of inline pass joint has left truncation at this time Valve, the valve ball in block valve rises to be sealed with valve seat cooperation, and the oil liquid of oil well lower layer cannot flow upwardly into pump barrel.
Description
Technical field
The invention belongs to the equipment of oil extraction in oil field, the device being mounted in pumpingh well, specifically a kind of fixed tubular column
Change a layer pumping means.
Background technique
Oil well has penetrated out multiple layers of position, due to interlayer difference, needs separately to recover the oil each oil reservoir, to eliminate interlayer
Interference.Current main oil production by layer method is tripping in separate-layer production string, production horizon is closed, by oil production by layer
Tubing string will need production horizon position and pit shaft connection, realize oil production by layer.Since the oil-gas migration and judgement of oil reservoir are inaccurate, also
Injection-production program adjustment, it is sometimes desirable to change production layer position.Separate-layer production string all must be risen with current separate-layer string,
Then tripping in produces the flow string of another outer horizon again.This method for replacing layers needs construction teams, change that layer operation need when
Between it is long, operating cost is high, and the oil well off-time is long.To solve the above-mentioned problems, scientific research personnel has developed fixed tubular column and changes a layer skill
Art, this technology are the tripping in floor switches on separate-layer string, have track on switch, are suppressed by ground, make the pin on track
Nail converts position in orbit, realizes the on or off of floor switch, realizes fixed tubular column layering production with this.But this layering
The reliability of floor switch in flow string is not high, there is spring, sliding sleeve, sealing ring on floor switch, is depended on pressure and area
The different on or off for realizing floor switch of difference.Since each layer of pressure is estimated inaccurate, the elastic force of spring is limited by mineshaft diameter
System can not be designed very big, the problem of spring does not push track pin to commutate often occur, and make to change layer failure；It is this to change layer
There are one the gap centres that problem is sliding sleeve to be easy to fall into sundries for method, and so that it is stuck can not achieve switch, also make to change layer
Failure；This method for replacing layers is still another problem is that sealing ring wants band to press through relief hole when switching, it is easy to be damaged, also make to change layer
Failure.This to change layer technology multilayer is mixed to adopt due to occurring after changing layer failure, oil recovery data can equally change, and cause ground
Face is bad to be judged whether to change layer success, is brought misjudgement to establishment development plan, is brought very big loss through oil field development.
Summary of the invention
The purpose of the present invention is designing a kind of fixed tubular column to change a layer pumping means, overcome the problems, such as above-mentioned, eliminates not
Insecure problem present in dynamic tubing string layering production technology, reduces the operation process of layering production, improves the exploitation in oil field
Benefit.
The object of the present invention is achieved like this: including outer cylinder, insertion sealing device, sucker rod, pump barrel, plunger, fuel-displaced
Valve, inlet valve, reversing cover, connecting tube, orbitron, sliding sealing device, inline pass joint, external connection pass joint, block valve, truncation
The top of valve is connect with the lower part of external connection pass joint, there is linked hole, the top of external connection pass joint and connecting tube on external connection pass joint
Lower part connection, the top of the lower part of outer cylinder and connecting tube connects, and the lower part of sucker rod connect with plunger, installs on plunger fuel-displaced
Valve, sucker rod, plunger, delivery valve are put into pump barrel, and the interior feather key of reversing cover is placed in the track of orbitron, make reversing cover set
On orbitron, the track of orbitron has long track and short track, and the interior feather key of reversing cover can be from the long track on orbitron
It switches tracks to short track, reversing cover is enable to be in the top or lower part of orbitron, be inserted into sealing device, pump barrel, inlet valve, track
Pipe, sliding sealing device, inline pass joint are sequentially connected in rear tripping in outer cylinder, when reversing cover is on the long track of orbitron,
Sliding sealing device blocks the linked hole on external connection pass joint, and the lower part body of rod of inline pass joint passes through the valve seat on block valve,
By the valve ball pressure in block valve from valve seat engaged therewith, keep block valve in the open state, insertion sealing device enters outer cylinder
Interior to cooperate sealing with it, the inner wall of the outer wall indentation connecting tube of reversing cover is temporarily fixed to reversing cover in connecting tube, plunger
Outer diameter is greater than the internal diameter of insertion sealing device, and when lifting sucker rod, plunger can hang insertion sealing device and move up, and make rail
Deferent uplink makes the interior feather key of reversing cover be in the bottom of the track on orbitron, then transfers sucker rod, the interior feather key of reversing cover
It will shift in the short track of orbitron, sliding sealing device is on the linked hole on connection connector, makes the linked hole
It is opened, the lower part body of rod of inline pass joint leaves the valve ball in block valve, and block valve is closed, and liquid stream cannot flow from bottom to top
Cross block valve.
The beneficial effects of the present invention are: the oil liquid of oil well lower layer can be entered in pump by block valve, the oil liquid on oil well upper layer
It can be entered in pump by the linked hole on connection connector, block valve and linked hole can be made alternately to open and close by putting sucker rod
It closes.When needing to change layer oil pumping, it need to only lift from the top and put down sucker rod and achieve that fixed tubular column changes layer oil pumping, the present invention is in fixed tubular column
Movement when changing layer oil pumping not against spring, sliding sleeve, sealing ring under pressure, thus high reliablity, overcome in the prior art
There are the problem of, reduce the operation process of layering production, the development benefit in oil field can be improved, there is significant economic effect
Benefit.
Detailed description of the invention
Fig. 1 is structure chart of the invention (being broken into two).
Fig. 2 is the surface development of orbitron.
Specific embodiment
The embodiment of the present invention is illustrated with reference to the accompanying drawing.
As shown in Figure 1, the embodiment of the present invention includes including outer cylinder 1, insertion sealing device 2, sucker rod 3, pump barrel 4, column
Fill in 5, delivery valve 6, inlet valve 7, reversing cover 8, connecting tube 9, orbitron 10, sliding sealing device 12, inline pass joint 13, external connection
The top of pass joint 14, block valve 15, block valve 15 is connect with the lower part of external connection pass joint 14, has connection on external connection pass joint 14
The top in hole 11, external connection pass joint 14 is connect with the lower part of connecting tube 9, and the lower part of outer cylinder 1 is connect with the top of connecting tube 9, is taken out
The lower part of beam hanger 3 is connect with plunger 5, and it can be two that delivery valve 6(delivery valve is installed on plunger 5, is connected to the upper and lower of plunger 5
Both ends), sucker rod 3, plunger 5, delivery valve 6 are put into pump barrel 4, and the interior feather key of reversing cover 8 is placed in the track of orbitron 10,
It is sleeved on reversing cover 8 on orbitron 10, the track of orbitron 10 has long track 10-1 and short track 10-2, as shown in Fig. 2, changing
It can switch tracks to the interior feather key of set 8 from the long track 10-1 on orbitron 10 to short track 10-2, reversing cover 8 is enable to be in orbitron
Sealing device 2, pump barrel 4, inlet valve 7, orbitron 10, sliding sealing device 12, inline pass joint are inserted into 10 top or lower part
13 are sequentially connected in rear tripping in outer cylinder 1, when reversing cover 8 is on the long track 10-1 of orbitron 10,12 envelope of sliding sealing device
Linked hole 11 on stifled external connection pass joint 14, the lower part body of rod of inline pass joint 13 pass through the valve seat on block valve 15, will be truncated
Valve ball pressure in valve 15 keeps block valve 15 in the open state from valve seat engaged therewith, and insertion sealing device 2 enters outer cylinder 1
Interior to cooperate sealing with it, the inner wall of the outer wall indentation connecting tube 9 of reversing cover 8 makes reversing cover 8 be temporarily fixed to (change in connecting tube 9
It is interference fit to the contact surface between set 8 and connecting tube 9), the outer diameter of plunger 5 is greater than the internal diameter of insertion sealing device 2, lifting
When sucker rod 3, plunger 5 can hang insertion sealing device 2 and move up, and make 10 uplink of orbitron, make the interior feather key of reversing cover 8
The bottom of track on orbitron 10, then sucker rod 3 is transferred, the interior feather key of reversing cover 8 will shift to the short rail of orbitron 10
In road 10-2, sliding sealing device 12 is on the linked hole 11 on connection connector 14, and the linked hole 11 is made to be opened,
The lower part body of rod of inline pass joint 13 leaves the valve ball in block valve 15, and block valve 15 is closed, and liquid stream cannot flow from bottom to top
Cross block valve 15.
The lower part body of rod of inline pass joint 13 leaves block valve 15, and the power for increase the valve ball on block valve 15 comes from spring
Or the buoyancy of valve ball, it can also come to other strength.Regardless of which kind of rising manner to be in protection scope of the present invention using.
The lower part union tail of block valve 15 has packer on tail pipe, and packer separates two oil reservoirs, the well of upper oil reservoir
For annular space of the liquid through tail pipe and casing through the linked hole 11 into pump, the well liquid of lower oil reservoir flows up into pump through tail pipe.
The oil liquid on oil well upper layer can be entered in pump by the linked hole 11 on external connection pass joint 14, the oil liquid energy of oil well lower layer
Entered in pump by block valve 15.Fig. 1 is lower layer's oil state figure of pumpingh well, and the linked hole 11 is by sliding sealing device
12 close, and the oil liquid on oil well upper layer not can enter, and the interior feather key of reversing cover 8 is in the upper of the long track 10-1 of orbitron 10 at this time
Portion.When needing to change layer oil pumping, put-on and delegated sucker rod 3 makes the interior feather key of reversing cover 8 be in the short track 10-2 of orbitron 10
Top, sliding sealing device 12 cannot reach at the linked hole 11, and the linked hole 11 is in the open state, on oil well
The oil liquid of layer can enter in pump barrel 4.The body of rod of the lower part of inline pass joint 13 has left block valve 15 at this time, in block valve 15
Valve ball rise and sealed with valve seat cooperation, the oil liquid of oil well lower layer cannot flow upwardly into pump barrel 4.Therefore, the present invention is by mentioning
It puts sucker rod and achieves that fixed tubular column changes layer oil pumping.
Track groove on orbitron 10 is similar with the track on Y211 packer, can also use other types of track,
Such as the commutation track on ball pen, as long as achieving the effect that track of the invention, all within the scope of the present invention.
Mountable screen casing outside external connection pass joint 14 prevents sundries from entering in pump through the linked hole 11.
Contact surface between reversing cover 8 and connecting tube 9 is interference fit, can temporarily fix reversing cover 8, upper lifting force is greater than
When being interference fitted the power generated, reversing cover 8 can be suggested therewith from the inner extraction of connecting tube 9.
Claims (1)
1. a kind of fixed tubular column changes a layer pumping means, including outer cylinder (1), insertion sealing device (2), sucker rod (3), pump barrel (4),
Plunger (5), delivery valve (6), inlet valve (7), reversing cover (8), connecting tube (9), orbitron (10), sliding sealing device (12),
Inline pass joint (13), external connection pass joint (14), block valve (15), under the top of block valve (15) and external connection pass joint (14)
Portion connects, and has linked hole (11) on external connection pass joint (14), and the top of external connection pass joint (14) and the lower part of connecting tube (9) connect
It connects, the lower part of outer cylinder (1) is connect with the top of connecting tube (9), and the lower part of sucker rod (3) is connect with plunger (5), on plunger (5)
It installs delivery valve (6), sucker rod (3), plunger (5), delivery valve (6) are put into pump barrel (4), and the interior feather key of reversing cover (8) is placed
In the track of orbitron (10), it is sleeved on reversing cover (8) on orbitron (10), the track of orbitron (10) has long track
The interior feather key of (10-1) and short track (10-2), reversing cover (8) can switch tracks from the long track (10-1) on orbitron (10) to short
Track (10-2), make reversing cover (8) can be in orbitron (10) top or lower part, insertion sealing device (2), pump barrel (4), into
Oil valve (7), orbitron (10), sliding sealing device (12), inline pass joint (13) are sequentially connected in rear tripping in outer cylinder (1), are changed
When being on the long track (10-1) of orbitron (10) to set (8), sliding sealing device (12) is blocked on external connection pass joint (14)
Linked hole (11), the lower part body of rod of inline pass joint (13) passes through the valve seat on block valve (15), and block valve (15) is inner
Valve ball pressure keeps block valve (15) in the open state from valve seat engaged therewith, and insertion sealing device (2) enters in outer cylinder (1)
Cooperate sealing with it, the inner wall of outer wall indentation connecting tube (9) of reversing cover (8) makes reversing cover (8) be temporarily fixed to connecting tube
(9) on, the outer diameter of plunger (5) is greater than the internal diameter of insertion sealing device (2), and when lifting sucker rod (3), plunger (5) can be hung slotting
Enter sealing device (2) to move up, and make orbitron (10) uplink, is in the interior feather key of reversing cover (8) on orbitron (10)
Track bottom, then transfer sucker rod (3), the interior feather key of reversing cover (8) will shift to the short track (10-2) of orbitron (10)
In, sliding sealing device (12) is on the linked hole (11) on connection connector (14), beats the linked hole (11)
It opens, the lower part body of rod of inline pass joint (13) leaves the inner valve ball of block valve (15), and block valve (15) is closed, and liquid stream cannot be from
Flow through block valve (15) upwards down.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811077785.7A CN109025918B (en) | 2018-09-16 | 2018-09-16 | Layer-changing pumping device for stationary pipe column |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811077785.7A CN109025918B (en) | 2018-09-16 | 2018-09-16 | Layer-changing pumping device for stationary pipe column |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109025918A true CN109025918A (en) | 2018-12-18 |
| CN109025918B CN109025918B (en) | 2024-04-05 |
Family
ID=64622433
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811077785.7A Active CN109025918B (en) | 2018-09-16 | 2018-09-16 | Layer-changing pumping device for stationary pipe column |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109025918B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177574A (en) * | 2019-07-02 | 2021-01-05 | 中国石油化工股份有限公司 | Linkage type hydraulic layer changing switch and linkage type layer changing method |
| CN113503144A (en) * | 2021-06-29 | 2021-10-15 | 中国石油大学(华东) | Sliding sleeve rotating-upright post locking type shaft bottom safety valve |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2734995Y (en) * | 2004-09-01 | 2005-10-19 | 向志全 | Production assembly capable of recognizing oil layer hierarchically |
| RU2539053C1 (en) * | 2013-12-30 | 2015-01-10 | Андрей Сергеевич Казанцев | Unit for dual operation of several production facilities at one well (versions) and shutdown valve of revolving type |
| CN106014343A (en) * | 2016-05-16 | 2016-10-12 | 中国石油化工股份有限公司 | Separated injecting and separated mining thickened oil pump |
| CN106150447A (en) * | 2015-04-09 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of roofbolt controls payzone recognition methods |
| RU166990U1 (en) * | 2016-04-21 | 2016-12-20 | Публичное акционерное общество "Татнефть" им. В.Д. Шашина | DEVICE FOR SIMULTANEOUSLY SEPARATE OPERATION OF TWO LAYERS IN A WELL |
| CN205823249U (en) * | 2016-07-20 | 2016-12-21 | 山东成林石油工程技术有限公司 | Portable deciliter layering production controls device |
| CN208777971U (en) * | 2018-09-16 | 2019-04-23 | 东营市汇诚石油工程技术有限责任公司 | Fixed tubular column changes a layer pumping means |
-
2018
- 2018-09-16 CN CN201811077785.7A patent/CN109025918B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2734995Y (en) * | 2004-09-01 | 2005-10-19 | 向志全 | Production assembly capable of recognizing oil layer hierarchically |
| RU2539053C1 (en) * | 2013-12-30 | 2015-01-10 | Андрей Сергеевич Казанцев | Unit for dual operation of several production facilities at one well (versions) and shutdown valve of revolving type |
| CN106150447A (en) * | 2015-04-09 | 2016-11-23 | 中国石油化工股份有限公司 | A kind of roofbolt controls payzone recognition methods |
| RU166990U1 (en) * | 2016-04-21 | 2016-12-20 | Публичное акционерное общество "Татнефть" им. В.Д. Шашина | DEVICE FOR SIMULTANEOUSLY SEPARATE OPERATION OF TWO LAYERS IN A WELL |
| CN106014343A (en) * | 2016-05-16 | 2016-10-12 | 中国石油化工股份有限公司 | Separated injecting and separated mining thickened oil pump |
| CN205823249U (en) * | 2016-07-20 | 2016-12-21 | 山东成林石油工程技术有限公司 | Portable deciliter layering production controls device |
| CN208777971U (en) * | 2018-09-16 | 2019-04-23 | 东营市汇诚石油工程技术有限责任公司 | Fixed tubular column changes a layer pumping means |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112177574A (en) * | 2019-07-02 | 2021-01-05 | 中国石油化工股份有限公司 | Linkage type hydraulic layer changing switch and linkage type layer changing method |
| CN112177574B (en) * | 2019-07-02 | 2023-12-01 | 中国石油化工股份有限公司 | Linkage type hydraulic layer-changing switch and linkage type layer-changing method |
| CN113503144A (en) * | 2021-06-29 | 2021-10-15 | 中国石油大学(华东) | Sliding sleeve rotating-upright post locking type shaft bottom safety valve |
| CN113503144B (en) * | 2021-06-29 | 2023-02-17 | 中国石油大学(华东) | Sliding sleeve rotating-upright post locking type shaft bottom safety valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109025918B (en) | 2024-04-05 |
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