CN107725345B - Load-relieving structure and pumping unit with it - Google Patents
Load-relieving structure and pumping unit with it Download PDFInfo
- Publication number
- CN107725345B CN107725345B CN201610658897.6A CN201610658897A CN107725345B CN 107725345 B CN107725345 B CN 107725345B CN 201610658897 A CN201610658897 A CN 201610658897A CN 107725345 B CN107725345 B CN 107725345B
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- load
- relieving structure
- casing
- seal pipe
- pipe
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- 238000005086 pumping Methods 0.000 title claims abstract description 23
- 230000008676 import Effects 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 abstract description 21
- 230000000694 effects Effects 0.000 abstract description 8
- 239000007788 liquid Substances 0.000 description 12
- 241001023788 Cyttus traversi Species 0.000 description 5
- 208000001953 Hypotension Diseases 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000036543 hypotension Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B47/00—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
-
- 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Pressure Circuits (AREA)
- Actuator (AREA)
Abstract
The present invention provides a kind of load-relieving structure and with its pumping unit, including casing and the seal pipe being arranged in casing, lightening piston is provided in seal pipe, annular chamber is formed between lightening piston and seal pipe, the spiracle of the lumen for being connected to annular chamber and casing is provided in seal pipe, load-relieving structure further include: on-off control valve, on-off control valve are mounted at spiracle, for controlling the flow path on-off between annular chamber and the lumen of casing.Load-relieving structure in the present invention solves the problems, such as the size of the relief force of load reducer in the prior art by lag effects between casing pressure and oil pressure.
Description
Technical field
The present invention relates to field of petroleum exploitation, in particular to a kind of load-relieving structure and with its pumping unit.
Background technique
With the extension of oil exploitation time and the increase of recovery percent of reserves, petroleum resources are increasingly exhausted, and developing way is gradually
To deeply buried reservoir, energy is low, oil reservoir transfer of poor permeability, flood effectiveness difference.The technical difficulty of oil exploitation also constantly increases
Greatly, in order to realize deep extract, it must just deepen pump and hang, and pump setting depth increases, and will lead to oil pumping machine polished rod load increase.
Currently, the load of pumping unit has basically reached maximum under existing pump setting depth.If increasing pump setting depth
Words, it is necessary to replace larger number pumping unit, this can bring the adverse consequences of the increase of energy consumption, cost raising etc. again.To
In the case where unchanged face equipment, deepens pump extension, increase oil production, must just use the underground work with Load Alleviation Function
Tool, to mitigate oil pumping machine polished rod load.
The working principle of existing load reducer are as follows: when work, plunger tube, lightening piston and sucker rod link together, with
Rod string moves up and down together, the lower end surface and off-load due to the closure of upper and lower seal pipe and lightening piston, in upper seal pipe
An annular space is formed between the upper surface of piston, this annular space is connected to by spiracle with oil jacket annulus, therefore annular
The pressure in space and the pressure of oil jacket annulus are identical.And the lower end surface of lightening piston is in the liquid in oil pipe, pit shaft fluid column
The pressure of the identical i.e. lightening piston lower end surface of pressure in the endface.
It is in respectively due to the upper and lower end face of lightening piston in the different pressures system of oil pipe and casing, so in off-load
The upper and lower endface of piston generates a pressure difference, which generates a upward thrust --- relief force, the off-load masterpiece
Used in the lower end surface of lightening piston.
When pumping unit horsehead uplink, relief force auxiliary horse head drives sucker rod to move upwards, and mitigates polished rod load, together
When also mitigate pulling force suffered by lightening piston upper sucker rod, accelerate the speed uplink of pumping unit；When under pumping unit horsehead
When row, lightening piston moves downward under the drive of sucker rod, since relief force still remains, so the downlink of pumping unit horsehead
Speed slows down, this has also conformed exactly to the energy-saving principle that pumping unit uplink is fast, downlink is slow.
When the rod string for installing load reducer so moves back and forth above and below, horse head polished rod load is alleviated, to reach
Increase the purpose of pump setting depth.
However, between the size and hydrodynamic face of relief force, there is such relationships: in well head, relief force is in hydrodynamic face
Zero；With being gradually reduced for hydrodynamic face, relief force is gradually increased, when hydrodynamic face reaches load reducer breathing hole site, relief force
Reach maximum；When hydrodynamic face is below spiracle, relief force is constant.Disadvantage is that the size of relief force in addition to by
The influence of liquid level in wellbore is also influenced by gap between casing pressure and oil pressure.
Summary of the invention
The main purpose of the present invention is to provide a kind of load-relieving structure and with its pumping unit, to solve in the prior art
Load reducer relief force size by between casing pressure and oil pressure the problem of lag effects.
To achieve the goals above, it according to an aspect of the invention, there is provided a kind of load-relieving structure, including casing and sets
The seal pipe in casing is set, lightening piston is provided in seal pipe, forms annular chamber between lightening piston and seal pipe, is sealed
The spiracle of the lumen for being connected to annular chamber and casing, load-relieving structure are provided on pipe further include: on-off control valve, on-off control
Valve processed is mounted at spiracle, for controlling the flow path on-off between annular chamber and the lumen of casing.
Further, on-off control valve is check valve, and the lumen of import towards the seal pipe of check valve is arranged.
Further, on-off control valve is shut-off valve.
Further, on-off control valve is hydraulic control on-off valve.
Further, on-off control valve is automatically controlled on-off valve.
Further, load-relieving structure further include: oil pipe, oil pipe be arranged in casing, seal pipe be connected on oil pipe and with
The lumen of oil pipe is connected to.
Further, load-relieving structure further includes plunger tube, and lightening piston is arranged on plunger tube.
Further, the sucker rod of plunger tube and pumping unit connects.
Further, seal pipe has the upper end wall and lower end wall for the upper/lower terminal for being located at its tube body, on-off control
Valve is arranged in the upper end wall of seal pipe.
The present embodiment additionally provides a kind of pumping unit, including load-relieving structure, and load-relieving structure is above-mentioned load-relieving structure.
Load-relieving structure in the present invention includes casing and the seal pipe that is arranged in casing, is subtracted due to being provided in seal pipe
Piston is carried, and forms annular chamber between lightening piston and seal pipe, is provided with on-off control valve in the spiracle of seal pipe, it can
To control the flow path on-off between annular chamber and the lumen of casing by the on-off for controlling the on-off control valve, and then in off-load
During the downlink of piston, makes the hypotension even zero in annular chamber, lightening piston is pressed downward to eliminate casing pressure
Power solves the problems, such as the size of the relief force of load reducer in the prior art by lag effects between casing pressure and oil pressure.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide further understanding of the present invention, and of the invention shows
Examples and descriptions thereof are used to explain the present invention for meaning property, does not constitute improper limitations of the present invention.In the accompanying drawings:
Fig. 1 shows the structural schematic diagram of the embodiment of load-relieving structure according to the present invention；
Fig. 2 shows the state diagrams that the lightening piston of load-relieving structure moves down；And
Fig. 3 shows the partial enlarged view of the load-relieving structure in Fig. 2.
Wherein, the above drawings include the following reference numerals:
10, casing；20, seal pipe；21, annular chamber；30, lightening piston；40, on-off control valve；50, oil pipe；60, plunger
Pipe；70, sucker rod.
Specific embodiment
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
The present invention provides a kind of load-relieving structures, please refer to Fig. 1 to Fig. 3, which includes that casing 10 and setting exist
Seal pipe 20 in casing 10 is provided with lightening piston 30 in seal pipe 20, forms ring between lightening piston 30 and seal pipe 20
Shape chamber 21 is provided with the spiracle of the lumen for being connected to annular chamber 21 and casing 10, load-relieving structure in seal pipe 20 further include:
On-off control valve 40, on-off control valve 40 are mounted at spiracle, for controlling between annular chamber 21 and the lumen of casing 10
Flow path on-off.
Load-relieving structure in the present invention includes casing 10 and the seal pipe 20 that is arranged in casing 10, due in seal pipe 20
Be provided with lightening piston 30, and between lightening piston 30 and seal pipe 20 formed annular chamber 21, the spiracle of seal pipe 20 it is upper
It is provided with on-off control valve 40, the pipe of annular chamber 21 and casing 10 can be controlled by controlling the on-off of the on-off control valve 40
Flow path on-off between chamber, and then during the downlink of lightening piston 30, make the hypotension even zero in annular chamber 21,
To eliminate casing pressure to the downward pressure of lightening piston 30, the size for solving the relief force of load reducer in the prior art is covered
Between pressure and oil pressure the problem of lag effects.
In one embodiment of the invention, on-off control valve 40 is check valve, and the import of check valve is towards seal pipe
20 lumen setting.In this way, can more easily make lightening piston 30 when moving downward, do not enter liquid in annular chamber 21
Body guarantees to be vacuum state in it, and then guarantees relief force.Specifically, when the pressure in annular chamber 21 is greater than the pressure on the outside of it
When power (pressure i.e. in casing), check valve is opened, and flows out the oil liquid in annular chamber 21 from the check valve.
In a second embodiment of the present invention, on-off control valve 40 is shut-off valve.When lightening piston 30 moves upwards,
Shut-off valve is opened, and annular chamber 21 and the inner cavity of casing 10 is connected；When lightening piston 30 moves downward, shut-off valve is closed, and is made
The inner cavity of annular chamber 21 and casing 10 disconnects.Specifically, when the pressure in annular chamber 21 is greater than the pressure on the outside of it (i.e. in casing
Pressure) when, shut-off valve is opened, and flows out oil liquid in annular chamber 21 from the shut-off valve.
In third embodiment of the invention, on-off control valve 40 is hydraulic control on-off valve.It is transported upwards in lightening piston 30
When dynamic, hydraulic control on-off valve is opened, and annular chamber 21 and the inner cavity of casing 10 is connected；When lightening piston 30 moves downward, hydraulic control
On-off valve is closed, and the inner cavity of annular chamber 21 and casing 10 is disconnected.Specifically, when the pressure in annular chamber 21 is greater than on the outside of it
When pressure (pressure i.e. in casing), hydraulic control on-off valve is opened, and flows out the oil liquid in annular chamber 21 from the hydraulic control on-off valve.
In the 4th embodiment of the invention, on-off control valve 40 is automatically controlled on-off valve.It is transported upwards in lightening piston 30
When dynamic, automatically controlled on-off valve is opened, and annular chamber 21 and the inner cavity of casing 10 is connected；It is automatically controlled when lightening piston 30 moves downward
On-off valve is closed, and the inner cavity of annular chamber 21 and casing 10 is disconnected.Specifically, when the pressure in annular chamber 21 is greater than on the outside of it
When pressure (pressure i.e. in casing), automatically controlled on-off valve is opened, and flows out the oil liquid in annular chamber 21 from the automatically controlled on-off valve.
In the present embodiment, as shown in Figure 1 to Figure 3, load-relieving structure further include: oil pipe 50, oil pipe 50 are arranged in casing 10
Interior, seal pipe 20 is connected on oil pipe 50 and is connected to the lumen of oil pipe 50.
Specifically, there are two seal pipes 20, two seal pipes 20 to set gradually above and below along oil pipe 50 for setting on oil pipe 50,
Lightening piston is arranged in the seal pipe of upside.
In the present embodiment, as shown in Figure 1, load-relieving structure further includes plunger tube 60, lightening piston 30 is arranged in plunger tube
On 60.Preferably, lightening piston 30 is the peripheral outer lips of plunger tube 60.
In the present embodiment, plunger tube 60 is connect with the sucker rod 70 of pumping unit.In this way, by making plunger tube 60 and oil pumping
Bar 70 connects, and plunger tube 60 can be made to connect with sucker rod 70.
Specifically, seal pipe 20 has the upper end wall and lower end wall for the upper/lower terminal for being located at its tube body, on-off control
Valve 40 is arranged in the upper end wall of seal pipe 20.In this manner it is ensured that fluid is flowed out from pneumostome as much as possible.In this scheme
Signified "upper", "lower" be using pumping unit in normal mounting state as reference.
The present invention also provides a kind of pumping unit, including load-relieving structure, load-relieving structure is above-mentioned load-relieving structure.In the present invention
Load reducer relief force size not by between casing pressure and oil pressure the problem of lag effects.
The present embodiment is to be mentioned for the relief force of existing load reducer by pit shaft liquid level and oil pressure and the influence of casing pressure gap
Improved method out, this method can overcome the gap between liquid level in wellbore and oil pressure and casing pressure, make relief force only by
Oil pressure is one-side to be influenced to expand the scope of application of load reducer, same position off-load effect be better than existing load reducer and
The deeper off-load effect of its installation site is more obvious.
On the basis of the load reducer of the present embodiment in the prior art, check valve is installed in spiracle.Assemble this load reducer
Afterwards, when load reducer piston can move up and down pumping unit with sucker rod at work, when it is in down stroke due to piston
Pressure is tubing pressure P1, and upper end pressure is made of two parts.A part is that internal piston is generated by fluid column and oil pressure
Downward pressure P2, another part are formed by closed chamber (annular chamber) pressure in piston bush and produce for upper piston area and check valve
Raw downward pressure P3.Check valve can be discharged chamber indoor gas or liquid when load reducer piston stroking upward, and check valve closes when downlink
It closes.Therefore, this chamber pressure P3 is 0.Therefore, relief force P=P1-P2 caused by this load reducer.
Compared with the background art compared with because the application design load reducer without spiracle and by check valve substitute spiracle into
And casing pressure is eliminated to lightening piston downward pressure.Therefore, the relief force that this load reducer is generated in same position is compared with technical background
Involved in relief force it is bigger.In addition, this load reducer is not influenced by casing pressure, therefore installation site will not be by the shadow of pit shaft liquid level
It rings, installation site is deeper, and generation relief force is bigger.
The application can open in inspection pump maintenance at sealing nut and empty when moving on to top on piston and then make to subtract
Carry piston makes sealing piston upper end surface in class vacuum state when moving up and down.Piston is to be fixedly connected but connect with sucker rod
Socket part position communicates liquid above and below and can flow freely.
In well in structure, piston is by two active forces, and wherein piston lower portion oil pressure generates upper phase separation power, piston to it
Top oil pressure generates down force to piston, and piston and upper and lower side and the oily area difference contacted and lower end contact surface relatively on
End is big.Therefore, oil pressure acts on the relief force that i.e. load reducer generates thus of pressure caused by the difference of upper and lower contact surface.
It can be seen from the above description that the above embodiments of the present invention realized the following chievements:
Load-relieving structure in the present invention includes casing and the seal pipe that is arranged in casing, is subtracted due to being provided in seal pipe
Piston is carried, and forms annular chamber between lightening piston and seal pipe, is provided with on-off control valve in the spiracle of seal pipe, it can
To control the flow path on-off between annular chamber and the lumen of casing by the on-off for controlling the on-off control valve, and then in off-load
During the downlink of piston, makes the hypotension even zero in annular chamber, lightening piston is pressed downward to eliminate casing pressure
Power solves the problems, such as the size of the relief force of load reducer in the prior art by lag effects between casing and oil pressure.
These are only the preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification,
Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of load-relieving structure, including casing (10) and the seal pipe (20) being arranged in described sleeve pipe (10), the seal pipe
(20) it is provided with lightening piston (30) in, forms annular chamber (21) between the lightening piston (30) and the seal pipe (20),
The spiracle of the lumen for being connected to the annular chamber (21) and described sleeve pipe (10) is provided on the seal pipe (20), it is special
Sign is, the load-relieving structure further include:
On-off control valve (40), the on-off control valve (40) is mounted at the spiracle, for controlling the annular chamber
(21) the flow path on-off between the lumen of described sleeve pipe (10).
2. load-relieving structure according to claim 1, which is characterized in that the on-off control valve (40) is check valve, described
The lumen of the import of check valve towards the seal pipe (20) is arranged.
3. load-relieving structure according to claim 1, which is characterized in that the on-off control valve (40) is shut-off valve.
4. load-relieving structure according to claim 1, which is characterized in that the on-off control valve (40) is hydraulic control on-off valve.
5. load-relieving structure according to claim 1, which is characterized in that the on-off control valve (40) is automatically controlled on-off valve.
6. load-relieving structure according to claim 1, which is characterized in that the load-relieving structure further include:
Oil pipe (50), in described sleeve pipe (10), the seal pipe (20) is connected to the oil pipe for oil pipe (50) setting
(50) it is connected on and with the lumen of the oil pipe (50).
7. load-relieving structure according to claim 1, which is characterized in that the load-relieving structure further includes plunger tube (60), institute
Lightening piston (30) are stated to be arranged on the plunger tube (60).
8. load-relieving structure according to claim 7, which is characterized in that the sucker rod of plunger tube (60) and pumping unit
(70) it connects.
9. load-relieving structure according to claim 1, which is characterized in that the seal pipe (20), which has, is located at its tube body
Upper/lower terminal upper end wall and lower end wall, the on-off control valve (40) is arranged in the upper end of the seal pipe (20)
On wall.
10. a kind of pumping unit, including load-relieving structure, which is characterized in that the load-relieving structure is any one of claims 1 to 9
The load-relieving structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658897.6A CN107725345B (en) | 2016-08-11 | 2016-08-11 | Load-relieving structure and pumping unit with it |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610658897.6A CN107725345B (en) | 2016-08-11 | 2016-08-11 | Load-relieving structure and pumping unit with it |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107725345A CN107725345A (en) | 2018-02-23 |
| CN107725345B true CN107725345B (en) | 2019-08-02 |
Family
ID=61200564
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610658897.6A Active CN107725345B (en) | 2016-08-11 | 2016-08-11 | Load-relieving structure and pumping unit with it |
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| Country | Link |
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| CN (1) | CN107725345B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1198998A1 (en) * | 1983-07-15 | 1994-12-15 | Татарский государственный научно-исследовательский и проектный институт нефтяной промышленности "ТатНИПИнефть" | Plant for oil recovery from well |
| CN2353932Y (en) * | 1998-03-27 | 1999-12-15 | 欧连贵 | Load reducer for oil-pumping machine |
| CN2654901Y (en) * | 2003-06-12 | 2004-11-10 | 刘景三 | Anti-sand seizing thickening deep-pumping pump |
| CN202157953U (en) * | 2011-07-12 | 2012-03-07 | 东北石油大学 | Load-reduction sucker rod string |
| CN202228051U (en) * | 2011-10-10 | 2012-05-23 | 西南石油大学 | Communication-type load-reducing device suitable for heavy oil production by mixing thin oil |
| CN202900613U (en) * | 2012-10-29 | 2013-04-24 | 陕西联盟物流有限公司 | Speed reducer of oil pumping machine |
-
2016
- 2016-08-11 CN CN201610658897.6A patent/CN107725345B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1198998A1 (en) * | 1983-07-15 | 1994-12-15 | Татарский государственный научно-исследовательский и проектный институт нефтяной промышленности "ТатНИПИнефть" | Plant for oil recovery from well |
| CN2353932Y (en) * | 1998-03-27 | 1999-12-15 | 欧连贵 | Load reducer for oil-pumping machine |
| CN2654901Y (en) * | 2003-06-12 | 2004-11-10 | 刘景三 | Anti-sand seizing thickening deep-pumping pump |
| CN202157953U (en) * | 2011-07-12 | 2012-03-07 | 东北石油大学 | Load-reduction sucker rod string |
| CN202228051U (en) * | 2011-10-10 | 2012-05-23 | 西南石油大学 | Communication-type load-reducing device suitable for heavy oil production by mixing thin oil |
| CN202900613U (en) * | 2012-10-29 | 2013-04-24 | 陕西联盟物流有限公司 | Speed reducer of oil pumping machine |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107725345A (en) | 2018-02-23 |
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