CN111852843A - Elastic gap sealing device for deep well oil pump - Google Patents
Elastic gap sealing device for deep well oil pump Download PDFInfo
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- CN111852843A CN111852843A CN201910362242.8A CN201910362242A CN111852843A CN 111852843 A CN111852843 A CN 111852843A CN 201910362242 A CN201910362242 A CN 201910362242A CN 111852843 A CN111852843 A CN 111852843A
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- 238000007789 sealing Methods 0.000 title claims abstract description 51
- 239000003129 oil well Substances 0.000 claims abstract description 27
- 238000003825 pressing Methods 0.000 claims description 20
- 238000007667 floating Methods 0.000 claims description 19
- 238000005299 abrasion Methods 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000004576 sand Substances 0.000 description 42
- 239000003921 oil Substances 0.000 description 19
- 238000013461 design Methods 0.000 description 16
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 9
- 239000012530 fluid Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 3
- 230000002706 hydrostatic effect Effects 0.000 description 3
- 238000007790 scraping Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000005489 elastic deformation Effects 0.000 description 2
- 239000013013 elastic material Substances 0.000 description 2
- 229920006351 engineering plastic Polymers 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 238000010795 Steam Flooding Methods 0.000 description 1
- 238000010793 Steam injection (oil industry) Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/02—Packing the free space between cylinders and pistons
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/10—Valves; Arrangement of valves
- F04B53/1002—Ball valves
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- 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
- F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
- F04B53/14—Pistons, piston-rods or piston-rod connections
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
The invention provides an elastic gap sealing device for a deep well oil pump, which comprises: at least one single-stage sealing unit, the single-stage sealing unit comprising: a pump barrel (1) and a thin-wall plunger (2); and a non-contact elastic gap seal is formed between the thin-wall plunger (2) and the pump barrel (1). According to the invention, the existing plunger is changed into the thin-wall plunger, so that a non-contact elastic gap seal is formed between the thin-wall plunger and the pump barrel, the leakage of the whole pump can be greatly reduced, the efficiency of an oil well pump is improved, and the problems of serious abrasion of the pump barrel and the plunger and short pump detection period caused by the existing contact soft seal are avoided.
Description
Technical Field
The invention relates to the field of oil exploitation, in particular to an elastic gap sealing device for a deep well oil pump.
Background
At present, in the field of oil exploitation, a gap seal is adopted between a plunger and a pump barrel of a common oil pump, the existing gap seal is a rigid gap generally, and when the oil exploitation is carried out, because the underground temperature is higher than the ground temperature, the rising of the temperature can cause a certain amount of thermal deformation of parts such as the pump barrel, the plunger and the like, so that the gap becomes nonuniform, the initial gap value is greatly changed, and the pump is blocked in the working process of the pump. In addition, when the oil well pump works, the pump barrel and the plunger generate radial deformation under the action of internal pressure, external pressure and axial force, and the initial clearance between the plunger and the pump barrel is changed.
Based on above-mentioned problem, current sand production well is preventing that the clearance seal design in the aspect of the oil-well pump card sand mainly is:
(1) adopt the design of scraping sand or sand setting structure, the problem of scraping sand structure lies in: the plunger and the pump barrel are in clearance seal, liquid flow is inevitably generated in the clearance seal, so sand inevitably enters the clearance seal between the plunger and the pump barrel, and the design method only relieves the problem of pump blockage caused by sand to a certain extent and cannot fundamentally solve the problem. The sand setting structure adopts a sand setting two-way joint and a pump-down sand setting pipe, and settled sand is stored in the pump-down sand setting pipe, but the storage space of the sand setting pipe is limited, and the problem cannot be fundamentally solved.
(2) Adopt clearance seal to be the soft seal design of zero, the problem lies in: the plunger sealing element is made of various non-metal elastic materials such as rubber and engineering plastics, and is always in a wear state with the pump barrel, and the soft sealing element and the pump barrel bear wear for a long time, so that the pump detection period is limited, and the design is only suitable for oil wells with serious sand production.
Therefore, there is a need to develop a sealing method between the plunger and the pump barrel of an oil well pump, which is suitable for deep wells and sand production wells, can improve the pumping efficiency of the oil well pump and can prolong the pump checking period, so as to meet the technical requirements of the lifting process of deep wells and sand production wells.
Disclosure of Invention
In order to improve the pumping efficiency of the oil well pump and prolong the pump checking period, the invention provides an elastic gap sealing device of the deep well oil well pump, which comprises: at least one single-stage sealing unit, the single-stage sealing unit comprising: a pump barrel 1 and a thin-wall plunger 2;
and a non-contact elastic gap seal is formed between the thin-wall plunger 2 and the pump barrel 1.
Further, the apparatus further comprises: a center rod 3;
the single-stage sealing units are connected through the central rod 3 and are connected in series to form a multi-stage sealing structure.
Further, the apparatus further comprises: pressing sleeve 4;
the thin-wall plunger 2 is connected with the pressing sleeve 4 through threads and a first pin 7.
Furthermore, a thin-wall plunger 2, a pressing sleeve 4 and a central rod 3 are arranged on the inner wall side close to the pump barrel 1 in sequence.
Further, the apparatus further comprises: a floating valve ball 6;
the floating valve ball 6 is fixedly connected to the central rod 3.
Further, the apparatus further comprises: a traveling valve seat 5;
the floating valve seat 5 is connected with the pressing sleeve 4 through threads and a second pin 8.
Further, the thin-wall plunger 2 and the floating valve seat 5 are fixedly connected to the pressing sleeve 4.
Further, the wall thickness of the thin-walled plunger 2 is 2.6mm-4.1 mm.
Further, a non-contact elastic gap seal is formed between the thin-wall plunger 2 and the pump barrel 1 and is 0.07mm-0.09 mm.
Further, the number of the single-stage sealing units is three.
According to the invention, the existing plunger is changed into the thin-wall plunger, so that a non-contact elastic gap seal is formed between the thin-wall plunger and the pump barrel, the leakage of the whole pump can be greatly reduced, the efficiency of an oil well pump is improved, and the problems of serious abrasion of the pump barrel and the plunger and short pump detection period caused by the existing contact soft seal are avoided.
In order to make the aforementioned and other objects, features and advantages of the invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a single-stage sealing unit according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the pumping system of the sucker rod pump, a conventional tubular oil pump is used as a main extracting solution tool and is widely applied to various oil field exploitation areas in China. Along with the enhancement of oil field exploitation intensity, the oil well sand production problem is more and more serious to become the important reason that causes the oil-well pump inefficacy gradually, mainly show for sand card pump and sanding plunger and pump cylinder etc. cause the effective production cycle of oil well to shorten, the operation is frequent, and manufacturing cost promotes by a wide margin.
The existing common oil pump adopts clearance seal between a plunger and a pump barrel, the clearance seal is theoretically a rigid clearance, after an initial clearance of the pump is selected, the initial clearance value is changed due to the influences of the temperature of an oil well, the depth of a lower pump, abrasion and the like when the pump works in the oil well, and actually, the clearance value of the pump in the working process is a variable and gradually increases along with the abrasion clearance. For a deep well oil pump, the factors influencing the clearance mainly comprise two aspects of the oil well temperature and the lower pump depth:
1. Influence of temperature on the gap
The initial clearance value of the plunger and the pump barrel is measured at normal temperature (20 ℃), and the downhole temperature is higher than the surface temperature. If the average temperature gradient of the oil well is 3 ℃/100m, the temperature of the well head is 30 ℃, the well entry depth of the oil pump is 2000m, and the working temperature of the pump reaches 90 ℃. For a thermal oil production well, when steam injection thermal oil production processes such as steam huff and puff, steam flooding and the like are adopted, the bottom temperature reaches more than 200 ℃, the temperature rise can cause certain thermal deformation of parts such as a pump barrel, a plunger and the like, for example, the shape of the cross section in the pump barrel is changed from a circle to an ellipse, so that gaps are changed to be uneven, the initial gap value is greatly changed, and the pump is blocked in the working process.
2. Influence of hydrostatic pressure on clearance
When the oil pump works, the plunger and the pump cylinder bear axial forces such as self gravity, tail pipe gravity, friction force between the plunger and the pump cylinder and the like, and more importantly bear axial forces caused by internal pressure and external pressure under the action of an internal hydrostatic column and an external hydrostatic column of the pump. The pump barrel and the plunger generate radial deformation under the action of internal pressure, external pressure and axial force, and the initial gap between the plunger and the pump barrel is changed. When the deep well oil pump is lowered to a well depth of 2800m, the sinking degree is usually shallow, and in this case, the initial clearance value between the plunger and the pump barrel is changed greatly, which usually increases greatly, resulting in increased leakage and reduced pump efficiency.
For a sand production well, in the aspect of preventing the oil well pump from blocking sand, the existing clearance seal design generally adopts the following steps:
1. the design principle of the sand scraping structure is to prevent or reduce sand grains from entering a clearance seal between the plunger and the pump barrel so as to avoid or reduce the possibility of sand blocking the pump. The design is applied more at present, but well fluid containing sand is suspended in the fluid and moves along with the fluid, a gap is formed between the plunger and the pump cylinder, and the gap seal inevitably has fluid flow, so the sand inevitably enters the gap seal between the plunger and the pump cylinder. The sand setting structure adopts a sand setting two-way joint and a pump-down sand setting pipe, and settled sand is stored in the pump-down sand setting pipe, but the storage space of the sand setting pipe is limited, so that the problem cannot be fundamentally solved.
2. And a soft seal design method with zero clearance seal is adopted. The design principle is to allow sand grains to enter any space in the pump, and the sand pump has the characteristics of small leakage amount, high pump efficiency and the like, and can thoroughly solve the problem of sand jamming. However, the plunger sealing element is made of various non-metal elastic materials such as rubber and engineering plastics, and is always in a wear state with the pump barrel, the soft sealing element and the pump barrel are worn for a long time, the pump detection period is limited, and the plunger sealing element is only suitable for oil wells with serious sand production.
The above design can not solve the problems of sand jamming pump, sand grinding plunger and pump barrel. In order to solve the above problems, the present invention provides an elastic gap sealing device for a deep well pump, as shown in fig. 1, fig. 1 is a schematic view of a single-stage sealing unit according to an embodiment of the present invention, wherein the elastic gap sealing device for a deep well pump comprises: at least one single-stage sealing unit, the single-stage sealing unit comprising: a pump barrel 1 and a thin-wall plunger 2;
and a non-contact elastic clearance seal is formed between the thin-wall plunger 2 and the pump barrel 1.
Specifically, the formula for calculating the oil leakage amount by applying the flow equation of the gap flow is as follows:
or
Wherein q is a leakage amount, m3/s；
D is the diameter of the plunger or the pump cylinder, m;
to a relative eccentricity
g＝9.8m/s2；
A single-sided gap, m;
delta p is the pressure difference between the upper part and the lower part of the plunger piston, Pa;
Ldm is the working fluid level depth;
l is plunger length, m;
u is the maximum speed of the plunger, m/s;
v is kinematic viscosity, m2/s；
μ is dynamic viscosity, pas.
Assuming that the plunger is concentric with the pump barrel, e is 0, the plunger is stationary, and U is 0, equation (2) is simplified as:
as can be seen from the formula (3), under the same other well conditions, the leakage q of the pump is proportional to the differential pressure Δ p between the top and bottom of the plunger and the cube of the clearance value, and as Δ p increases, the leakage q increases rapidly, and the pump efficiency decreases significantly, and if the clearance value can be made to be a variable of the size of the automatic compensation, the pump efficiency can be ensured.
In the embodiment of the invention, under the condition that the thickness of the pump cylinder is not changed, the wall thickness of the sealing cylinder matched with the plunger and the pump cylinder is reduced, and the thin-wall plunger is adopted, so that the rigid clearance between the pump cylinder and the plunger is changed into an elastic clearance, and as shown in fig. 1, a non-contact elastic clearance seal is formed between the thin-wall plunger 2 and the pump cylinder 1. For deep well oil pumping, when the well depth reaches 2800mm, the pressure difference Δ p between the upper and lower parts of the plunger is greatly increased, and for a common pump, the clearance value is greatly increased, the leakage amount is sharply increased, and the pump efficiency is obviously reduced. However, for non-contact elastic gap sealing, when the pressure difference delta p is greatly increased, the outer diameter of the thin-wall plunger piston is elastically expanded under the action of liquid column pressure, the gap sealing value is reduced when the liquid column pressure is increased, and the gap sealing value between the plunger piston and the pump barrel is automatically compensated, so that the leakage q is reduced, and the pump efficiency is improved.
The non-contact elastic gap provided by the embodiment of the invention can effectively solve the problem of thermal deformation pump blockage, and the temperature resistance can reach 220 ℃. For a common pump, the temperature is increased to cause thermal deformation of a pump barrel and a plunger, so that the gap value is not uniform, and the pump clamping phenomenon is caused. The thin-wall plunger with the non-contact elastic gap seal has certain elasticity, so that the pump clamping phenomenon can be avoided under the condition that the pump barrel generates thermal deformation, and the thermal production well can normally produce; when sand grains or other mechanical hard impurities enter the clearance seal, the thin-wall plunger can generate elastic deformation, and the sand grains are prevented from damaging the working surfaces of the plunger and the pump cylinder. Meanwhile, the non-contact design can avoid the rapid abrasion caused by the large-area long-term contact of the plunger and the working surface of the pump cylinder. The non-contact elastic gap seal can effectively reduce the leakage loss, can be used for a deeper oil well and is suitable for the well depth of 2800 m; the non-contact design has wide application range: the method is suitable for various complex well conditions such as horizontal wells, highly deviated wells, conventional oil wells, sand producing oil wells, gas containing oil wells, heavy oil thermal recovery wells, deep wells and the like.
According to the embodiment of the invention, the existing plunger is changed into the thin-wall plunger, so that the non-contact elastic gap seal is formed between the thin-wall plunger and the pump barrel, the leakage of the whole pump can be greatly reduced, the efficiency of an oil well pump is improved, and the problems of serious abrasion of the pump barrel and the plunger and short pump inspection period caused by the existing contact soft seal are avoided.
Based on the content of the above embodiments, as an alternative embodiment: the device also includes: a center rod 3;
the single-stage sealing units are connected through the central rod 3 and are connected in series to form a multi-stage sealing structure.
Specifically, as shown in fig. 1, the central rod 3 is fixedly installed in the single-stage sealing units, and in the embodiment of the present invention, the central rod 3 functions to connect each single-stage sealing unit, that is, each single-stage sealing unit is connected in series to form a multi-stage sealing structure. It should be noted that, the number of the single-stage sealing units is not limited by the embodiment of the present invention.
The central rod provided by the embodiment of the invention enables a user to form a multi-stage sealing structure by serially connecting a plurality of single-stage sealing units through the central rod according to actual requirements, thereby facilitating the transportation of pumped fluid.
Based on the content of the above embodiments, as an alternative embodiment: the device also includes: pressing sleeve 4;
The thin-walled plunger 2 is connected with the pressing sleeve 4 through threads and a first pin 7.
Specifically, in fig. 1, the thin-walled plunger 2 is connected with the pressing sleeve 4 in a threaded manner, and in order to reinforce the connection manner of the thin-walled plunger 2 and the pressing sleeve 4, a first pin 7 is used.
Based on the content of the above embodiments, as an alternative embodiment: the side of the inner wall close to the pump barrel 1 is sequentially provided with a thin-wall plunger 2, a pressing sleeve 4 and a central rod 3.
Specifically, as shown in fig. 1, in the pump cylinder 1, components close to the inner wall side thereof are a thin-walled plunger 2, a pressure sleeve 4, and a center rod 3 in this order.
Based on the content of the above embodiments, as an alternative embodiment: the device also includes: a floating valve ball 6;
the floating valve ball 6 is fixedly connected on the central rod 3.
The floating ball valve is a one-way ball valve which is arranged on a plunger of the oil well pump and reciprocates along with the plunger to discharge liquid in the pump. As can be seen from fig. 1, the floating valve ball 6 is connected to the central rod 3 and is fixedly connected thereto.
Based on the content of the above embodiments, as an alternative embodiment: the device also includes: a traveling valve seat 5;
the floating valve seat 5 is connected with the pressing sleeve 4 through threads and a second pin 8.
Specifically, in fig. 1, the floating valve seat 5 is connected to the pressing sleeve 4 in a threaded manner, and a second pin 8 is used to reinforce the connection between the floating valve seat 5 and the pressing sleeve 4.
Based on the content of the above embodiments, as an alternative embodiment: the thin-wall plunger 2 and the floating valve seat 5 are fixedly connected to the pressing sleeve 4.
Specifically, the thin-wall plunger 2 and the floating valve seat 5 are both connected with the pressing sleeve 4 through threads so as to strengthen the connection stability between the thin-wall plunger and the floating valve seat.
Based on the content of the above embodiments, as an alternative embodiment: the wall thickness of the thin-walled plunger 2 is 2.6mm-4.1 mm.
Specifically, the non-contact elastic gap seal needs to be designed into a thin-walled plunger by reducing the wall thickness of the plunger to a certain value in structural consideration. At the moment, the determination of the wall thickness value of the thin-wall plunger is the key for designing the non-contact elastic clearance seal, the deformation is too small due to too large wall thickness value, the leakage reduction effect is not obvious, the expected design effect cannot be achieved, the deformation is too large due to too small wall thickness value, the interference fit is formed between the outer surface of the thin-wall plunger and the inner surface of the pump barrel, and the phenomena of pump blockage or rapid wear occur.
Through repeated research and test, the wall thickness of the thin-wall plunger is determined to be between 2.6mm and 4.1mm corresponding to different pump diameters. The corresponding relation between the wall thickness of the thin-wall plunger and the nominal pump diameter of the oil well pump is shown in table 1, and the table 1 is the corresponding table between the wall thickness of the thin-wall plunger and the nominal pump diameter of the oil well pump.
TABLE 1
| Nominal pump diameter (mm) | 38 | 44 | 57 | 70 | 83 | 95 |
| Thin-wall plunger piston wall thickness (mm) | 2.6 | 2.8 | 3.2 | 3.5 | 3.8 | 4.1 |
According to the embodiment of the invention, the wall thickness of the thin-wall plunger is determined according to a test so as to meet the design requirement of elastic sealing.
Based on the content of the above embodiments, as an alternative embodiment: the non-contact elastic gap seal formed between the thin-wall plunger 2 and the pump barrel 1 is 0.07mm-0.09 mm.
In the embodiment of the invention, through repeated development and test, and considering the conditions of large pump hanging depth, high well temperature and the like, when oil is pumped in an up stroke, the pressure of the inner side of the plunger is higher than that of the outer side, the thin-wall plunger can form elastic deformation outwards, and the processing fit clearance between the thin-wall plunger and the pump barrel is strictly controlled to be 0.07mm-0.09mm, so that non-contact elastic clearance sealing can be formed between the plunger and the pump barrel, and meanwhile, the conditions of clearance interference and abrasion between the plunger and the pump barrel under the pressure difference condition of below 30MPa are avoided.
The embodiment of the invention determines the clearance range value through tests, can greatly reduce the leakage of the whole pump under the condition of high sand content and the conventional well condition according to the non-contact elastic clearance seal between the thin-wall plunger and the pump barrel, improves the pump efficiency, has the forced sand carrying capacity due to the elastic design of the thin-wall plunger, and can thoroughly solve the problem of sand blocking of the pump.
Based on the content of the above embodiments, as an alternative embodiment: the number of the single-stage sealing units is three.
Specifically, in the embodiment of the invention, the plunger is designed into three sections of thin-wall plungers, each section of which is 300mm and is a single-stage sealing unit, and at the moment, three single-stage sealing units are arranged. As shown in fig. 1, the single-stage sealing unit is designed in two parts, a plunger fixing floating assembly part and a plunger fixing assembly part. The plunger floating assembly consists of a thin-wall plunger 2, a pressing sleeve 4 and a moving valve seat 5, the plunger fixing assembly consists of a central rod 3 and a moving valve ball 6, a non-contact elastic gap seal is formed between the thin-wall plunger 2 of the plunger floating assembly and the pump barrel 1, and three sections of single-stage sealing units are connected in series by the plunger fixing assembly to form a multi-stage sealing structure.
The principle and the implementation mode of the invention are explained by applying specific embodiments in the invention, and the description of the embodiments is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The utility model provides a deep well oil-well pump elastic gap sealing device which characterized in that, the device includes: at least one single-stage sealing unit, the single-stage sealing unit comprising: a pump barrel (1) and a thin-wall plunger (2);
and a non-contact elastic gap seal is formed between the thin-wall plunger (2) and the pump barrel (1).
2. The apparatus of claim 1, further comprising: a central rod (3);
the single-stage sealing units are connected through a center rod (3) and are connected in series to form a multi-stage sealing structure.
3. The apparatus of claim 2, further comprising: a pressing sleeve (4);
the thin-wall plunger (2) is connected with the pressing sleeve (4) through threads and a first pin (7).
4. A device according to claim 3, characterized in that near the inner wall side of the pump barrel (1) there are in turn a thin-walled plunger (2), a pressing sleeve (4), a central rod (3).
5. The apparatus of claim 4, further comprising: a floating valve ball (6);
the floating valve ball (6) is fixedly connected to the central rod (3).
6. The apparatus of claim 5, further comprising: a traveling valve seat (5);
the moving valve seat (5) is connected with the pressing sleeve (4) through threads and a second pin (8).
7. The device according to claim 6, characterized in that the thin-walled plunger (2) and the travelling valve seat (5) are fixedly connected to the pressure sleeve (4).
8. The device according to claim 1, characterized in that the wall thickness of the thin-walled plunger (2) is 2.6-4.1 mm.
9. The device according to claim 1, characterized in that the non-contact elastic gap seal formed between the thin-walled plunger (2) and the pump barrel (1) is 0.07mm-0.09 mm.
10. The apparatus of claim 1, wherein the single stage sealing unit is three.
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| CN201910362242.8A CN111852843A (en) | 2019-04-30 | 2019-04-30 | Elastic gap sealing device for deep well oil pump |
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| CN201910362242.8A CN111852843A (en) | 2019-04-30 | 2019-04-30 | Elastic gap sealing device for deep well oil pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114576147A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气股份有限公司 | Sucker-rod pump lifting downhole suction pressure control device |
| CN116085250A (en) * | 2023-01-10 | 2023-05-09 | 山东大学 | Integrated flow distribution type low-leakage plunger pair device |
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| 陶景明 等: "《采油机械》", 29 February 1988 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114576147A (en) * | 2020-12-01 | 2022-06-03 | 中国石油天然气股份有限公司 | Sucker-rod pump lifting downhole suction pressure control device |
| CN116085250A (en) * | 2023-01-10 | 2023-05-09 | 山东大学 | Integrated flow distribution type low-leakage plunger pair device |
| CN116085250B (en) * | 2023-01-10 | 2023-11-24 | 山东大学 | Integrated flow distribution type low-leakage plunger pair device |
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Application publication date: 20201030 |