CN110925189B - Double-air cushion damping whole cylinder pump and application method thereof - Google Patents
Double-air cushion damping whole cylinder pump and application method thereof Download PDFInfo
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- CN110925189B CN110925189B CN201911396646.5A CN201911396646A CN110925189B CN 110925189 B CN110925189 B CN 110925189B CN 201911396646 A CN201911396646 A CN 201911396646A CN 110925189 B CN110925189 B CN 110925189B
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- 238000013016 damping Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 238000007789 sealing Methods 0.000 claims abstract description 22
- 239000011796 hollow space material Substances 0.000 claims description 40
- 239000012530 fluid Substances 0.000 claims description 38
- 239000000853 adhesive Substances 0.000 claims description 11
- 230000001070 adhesive effect Effects 0.000 claims description 11
- 230000035939 shock Effects 0.000 claims description 9
- 230000009977 dual effect Effects 0.000 claims description 8
- 238000009434 installation Methods 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 239000003129 oil well Substances 0.000 abstract description 11
- 229910018503 SF6 Inorganic materials 0.000 description 12
- WMIYKQLTONQJES-UHFFFAOYSA-N hexafluoroethane Chemical compound FC(F)(F)C(F)(F)F WMIYKQLTONQJES-UHFFFAOYSA-N 0.000 description 12
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 description 12
- 229960000909 sulfur hexafluoride Drugs 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000003139 buffering effect Effects 0.000 description 4
- 238000000605 extraction Methods 0.000 description 2
- 230000002028 premature Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000003313 weakening effect Effects 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
- 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
- F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
-
- 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
-
- 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
- F04B53/001—Noise damping
- F04B53/003—Noise damping by damping supports
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention provides a double-air cushion damping whole cylinder pump and an application method thereof, which are mainly realized by sealing and connecting a double-air cushion damping device at the bottom end surface of a plunger, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion and an outer air cushion; meanwhile, in the descending process, the double-air cushion damping device firstly contacts the liquid level, and the stress is more uniform when the double-air cushion damping device contacts the liquid level due to the different pressures of the inner air cushion and the outer air cushion, so that the double-air cushion damping device is more suitable for different impact speeds and forces, the liquid impact action of the liquid level on the oil pump and even the whole oil well pipe string is greatly slowed down, and the purpose of prolonging the service lives of the oil pump and the oil well pipe string is achieved.
Description
Technical Field
The invention belongs to the field of oil and gas field oil extraction equipment, and particularly relates to a double-air cushion damping whole cylinder pump and an application method thereof.
Background
At present, an integral pump is generally adopted for oil extraction of an oil field pumping well, a plunger can impact the liquid surface at a high speed when going downwards, so that fluid load is suddenly transferred to an oil pipe from a rod column, and meanwhile, strong shock waves are generated to damage the whole pumping system. This effect is more pronounced especially for oil wells with insufficient fluid supply. With the oil well with the stroke frequency of 5 times, the number of liquid strokes occurring every day is 7200 times, and continuous liquid strokes can cause premature fatigue failure of a sucker rod string, premature damage of a valve ball and a valve seat of an oil pump, accelerated abrasion of a plunger and a pump barrel, and sudden stretching of an oil pipe under the action of liquid strokes can be caused, so that threads of the oil pipe are loosened, and leakage or disconnection faults occur.
Disclosure of Invention
The embodiment of the invention provides a double-air cushion damping whole cylinder pump and an application method thereof, and aims to solve the problem that the existing whole cylinder pump is easy to damage under the continuous liquid impact effect; the second purpose is to solve the problem of oil pipe leakage or disconnection caused by sudden stretching of the oil pipe due to continuous liquid impact.
In order to solve the technical problems, the invention provides a double-air cushion damping whole cylinder pump, which comprises a plunger and an axial center oil passing channel at the center of the plunger, and also comprises a double-air cushion damping device positioned right below the plunger, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion and an outer air cushion, the outer air cushion is sleeved on the outer wall of the inner air cushion, and the center of the inner air cushion is provided with a fluid channel which is mutually communicated with the axial center oil passing channel of the plunger in a sealing way;
the upper end face of the inner air cushion and the upper end face of the outer air cushion are both in sealing connection with the bottom end face of the plunger.
Further, the inner air cushion is of an annular cylindrical structure formed by coaxially sleeving a first inner cylinder and a first outer cylinder, the axial center of the first inner cylinder is a fluid channel which is used for passing through liquid up and down, and a sealed first annular hollow space is formed between the outer cylinder wall of the first inner cylinder and the inner cylinder wall of the first outer cylinder.
Further, the outer air cushion is of a circular cylinder structure formed by coaxially sleeving a second inner cylinder and a second outer cylinder, the axial center of the second inner cylinder is a nesting channel which is used for being embedded into the inner air cushion and penetrates up and down, and a sealed second annular hollow space is formed between the outer cylinder wall of the second inner cylinder and the inner cylinder wall of the second outer cylinder.
Further, the outer cylinder wall of the first outer cylinder and the inner cylinder wall of the second outer cylinder are outwards protruded or inwards recessed to form concave-convex alternate structures, and when the inner air cushion is nested in the outer air cushion, the concave-convex alternate structures on the two cylinder walls are mutually extruded and meshed.
Preferably, the concave-convex alternate structure is composed of block-shaped protrusions and grooves in a staggered manner.
Preferably, the concave-convex alternate structure is composed of annular grooves and annular protrusions, the outer cylinder wall of the first outer cylinder is provided with a plurality of annular grooves and annular protrusions from top to bottom at intervals, and the inner cylinder wall of the second outer cylinder is provided with a plurality of annular grooves and annular protrusions from top to bottom at intervals.
Further, the first annular hollow space and the second annular hollow space may each be filled with any one of a gas, a fluid, a semi-fluid, or a liquid.
Preferably, the internal pressure of the first annular hollow space is greater than the internal pressure of the second annular hollow space.
Further, the upper end surface of the inner air cushion, which is in contact with the bottom end surface of the plunger, and the upper end surface of the outer air cushion, which is in contact with the bottom end surface of the plunger, are coated with an adhesive, and the outer cylinder wall of the first outer cylinder is coated with the adhesive.
The embodiment also provides an application method of the double-air cushion damping whole cylinder pump, which comprises the following steps:
firstly, embedding an inner air cushion into an outer air cushion to ensure that the inner air cushion and the outer air cushion are coaxially sleeved;
Then, filling gas or liquid into the first annular hollow space of the inner air cushion and the second annular hollow space of the outer air cushion respectively, so that the pressure of the inner air cushion is higher than that of the outer air cushion, and the concave-convex alternate structures of the two are mutually extruded and meshed to form a sealing structure;
And finally, fixedly connecting the double-air cushion damping device to the bottom end surface of the plunger, ensuring that the oil passing channel in the axial center of the plunger is communicated with the fluid channel of the inner air cushion, and completing the installation of the double-air cushion damping device.
The beneficial effects of the invention are as follows:
The invention relates to a double-air cushion damping whole cylinder pump and an application method thereof, which are mainly realized by sealing and connecting a double-air cushion damping device at the bottom end surface of a plunger, wherein the double-air cushion damping device is formed by coaxially sleeved inner air cushion and outer air cushion; meanwhile, in the descending process, the double-air cushion damping device firstly contacts the liquid level, and the stress is more uniform when the double-air cushion damping device contacts the liquid level due to the different pressures of the inner air cushion and the outer air cushion, so that the double-air cushion damping device is more suitable for different impact speeds and forces, the liquid impact action of the liquid level on the oil pump and even the whole oil well pipe string is greatly slowed down, and the purpose of prolonging the service lives of the oil pump and the oil well pipe string is achieved.
In order to make the above-mentioned objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of a dual air cushion shock absorbing whole cylinder pump.
Fig. 2 is a schematic structural view of the inner cushion.
Fig. 3 is a schematic structural view of the outer cushion.
Fig. 4 is a schematic structural view of the first concave-convex alternate structure.
Fig. 5 is a schematic structural view of a second concave-convex alternate structure.
Reference numerals illustrate:
1. A plunger; 2. an inner air cushion; 3. an outer air cushion; 4. a concave-convex alternate structure; 5. an adhesive;
101. an axial center oil passage;
201. A fluid channel; 202. a first inner cylinder; 203. a first outer cylinder; 204. a first annular hollow space;
301. Nesting channels; 302. a second inner cylinder; 303. a second outer cylinder; 304. a second annular hollow space.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples.
In the present invention, the upper, lower, left and right directions in the drawings are regarded as the upper, lower, left and right directions of the double-air cushion shock absorbing whole cylinder pump described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
First embodiment:
The first embodiment of the invention relates to a double-air cushion damping whole cylinder pump, referring to fig. 1, comprising a plunger 1 and an axial center oil passing channel 101 at the center of the plunger 1, and further comprising a double-air cushion damping device positioned right below the plunger 1, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion 2 and an outer air cushion 3, the outer air cushion 3 is sleeved on the outer wall of the inner air cushion 2, and the center of the inner air cushion 2 is provided with a fluid channel 201 which is mutually communicated with the axial center oil passing channel 101 of the plunger 1 in a sealing way;
The upper end face of the inner air cushion 2 and the upper end face of the outer air cushion 3 are both in sealing connection with the bottom end face of the plunger 1.
The working process of the double-air cushion damping whole cylinder pump protected by the embodiment is as follows:
As shown in fig. 1, the inner air cushion 2 is embedded into the outer air cushion 3, so that the inner air cushion 2 and the outer air cushion 3 are ensured to be coaxially sleeved; filling gas or liquid into the first annular hollow space 204 of the inner air cushion 2 and the second annular hollow space 304 of the outer air cushion 3 respectively, so that the pressure of the inner air cushion 2 is higher than the pressure of the outer air cushion 3, and the two forms a sealing structure; fixedly connecting the double-air cushion damping device to the bottom end surface of the plunger 1, ensuring that the axial center oil passing channel 101 of the plunger 1 is communicated with the fluid channel 201 of the inner air cushion 2, and completing the installation of the double-air cushion damping device;
The double-air cushion damping whole cylinder pump is connected to the tail part of the oil pipe and falls into the shaft, when the plunger 1 descends, the double-air cushion damping device firstly contacts with the liquid level, namely, the double-air cushion damping device is subjected to liquid impact, however, as the double-air cushion damping device has a good damping effect, the action time of the plunger on the liquid level impact when the plunger of the oil pump descends is prolonged, so that the liquid impact of the liquid level on the oil pump and even the whole oil well pipe string is greatly slowed down, and the purpose of prolonging the service lives of the oil pump and the oil well pipe string is achieved.
In this embodiment, considering that the liquid needs to flow through the axial center oil passage 101 of the plunger 1 regardless of whether the plunger 1 is ascending or descending, and the dual air cushion damping device is connected to the lower end surface of the plunger 1, the liquid must flow through the dual air cushion damping device first, so the fluid passage 201 is opened in the center of the inner air cushion 2, and in order to avoid the occurrence of the throttling or expanding phenomenon, the diameter of the fluid passage 201 is preferably the same as the diameter of the axial center oil passage 101 in this embodiment.
The inner air cushion 2 and the outer air cushion 3 are mutually sleeved to form a double-layer air cushion structure, compared with a single air cushion, the double-layer air cushion structure has better damping effect, and the action time of the plunger to the liquid level impact when the plunger of the oil pump goes down can be prolonged, so that the liquid impact action of the liquid level to the oil pump and even the whole oil well pipe string is greatly slowed down.
Second embodiment:
The embodiment relates to a double-air cushion damping whole cylinder pump, referring to fig. 1, comprising a plunger 1 and an axial center oil passing channel 101 in the center of the plunger 1, and further comprising a double-air cushion damping device positioned right below the plunger 1, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion 2 and an outer air cushion 3, the outer air cushion 3 is sleeved on the outer wall of the inner air cushion 2, and the center of the inner air cushion 2 is provided with a fluid channel 201 which is mutually communicated with the axial center oil passing channel 101 of the plunger 1 in a sealing way; the upper end face of the inner air cushion 2 and the upper end face of the outer air cushion 3 are both in sealing connection with the bottom end face of the plunger 1.
Specifically, as shown in fig. 2, the inner air cushion 2 is a cylindrical structure formed by coaxially sleeving a first inner cylinder 202 and a first outer cylinder 203, the axial center of the first inner cylinder 202 is a fluid channel 201 for passing through liquid up and down, a sealed first annular hollow space 204 is formed between the outer cylinder wall of the first inner cylinder 202 and the inner cylinder wall of the first outer cylinder 203, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the first annular hollow space 204.
Referring to fig. 3, the outer air cushion 3 is a circular cylindrical structure formed by coaxially sleeving a second inner cylinder 302 and a second outer cylinder 303, the axial center of the second inner cylinder 302 is a nesting channel 301 which is used for being embedded into the inner air cushion 2 and penetrates up and down, a sealed second annular hollow space 304 is formed between the outer cylinder wall of the second inner cylinder 302 and the inner cylinder wall of the second outer cylinder 303, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the second annular hollow space 304.
As shown in fig. 1, the inner cushion 2 filled with gas (liquid) is fitted into the outer cushion 3, specifically, the first outer cylinder 203 and the second outer cylinder 303 are ensured to be in sealing contact, and the contact and the lamination between the two cylinder walls are ensured.
In particular, when filling the first annular hollow space 204 and the second annular hollow space 304 with gas/liquid, it is necessary to ensure that the internal pressure of the first annular hollow space 204 is greater than the internal pressure of the second annular hollow space 304, that is, that the pressure of the outer air cushion 3 is smaller than the pressure of the inner air cushion 2, in comparison, the outer air cushion 3 is softer and the inner air cushion 2 is harder, and the purpose is that when the outer air cushion 3 and the inner air cushion 2 are subjected to liquid impact, the outer air cushion 3 and the inner air cushion 2 have different buffering effects due to different hardness, and the double-layer buffering effect superposition further improves the buffering effect of the double-air cushion damping device.
Third embodiment:
The embodiment relates to a double-air cushion damping whole cylinder pump, referring to fig. 1, comprising a plunger 1 and an axial center oil passing channel 101 in the center of the plunger 1, and further comprising a double-air cushion damping device positioned right below the plunger 1, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion 2 and an outer air cushion 3, the outer air cushion 3 is sleeved on the outer wall of the inner air cushion 2, and the center of the inner air cushion 2 is provided with a fluid channel 201 which is mutually communicated with the axial center oil passing channel 101 of the plunger 1 in a sealing way; the upper end face of the inner air cushion 2 and the upper end face of the outer air cushion 3 are both in sealing connection with the bottom end face of the plunger 1.
Specifically, as shown in fig. 2, the inner air cushion 2 is a cylindrical structure formed by coaxially sleeving a first inner cylinder 202 and a first outer cylinder 203, the axial center of the first inner cylinder 202 is a fluid channel 201 for passing through liquid up and down, a sealed first annular hollow space 204 is formed between the outer cylinder wall of the first inner cylinder 202 and the inner cylinder wall of the first outer cylinder 203, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the first annular hollow space 204.
Referring to fig. 3, the outer air cushion 3 is a circular cylindrical structure formed by coaxially sleeving a second inner cylinder 302 and a second outer cylinder 303, the axial center of the second inner cylinder 302 is a nesting channel 301 which is used for being embedded into the inner air cushion 2 and penetrates up and down, a sealed second annular hollow space 304 is formed between the outer cylinder wall of the second inner cylinder 302 and the inner cylinder wall of the second outer cylinder 303, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the second annular hollow space 304.
Referring to fig. 2 and 3, the outer cylinder wall of the first outer cylinder 203 and the inner cylinder wall of the second outer cylinder 303 are both protruded outwards or recessed inwards to form a concave-convex alternate structure 4, and when the inner air cushion 2 is nested in the outer air cushion 3, the concave-convex alternate structures 4 on the two cylinder walls are mutually pressed and meshed.
Similar to gear engagement or mortise and tenon structure in building structure, the embodiment selects concave-convex fit to tightly clamp the first outer cylinder 203 and the second outer cylinder 303, namely, the inner air cushion 2 is sealed and nested in the outer air cushion 3, thereby avoiding the separation of the two air cushions caused by overlarge hydraulic impact pressure and further weakening the buffering effect.
Preferably, as shown in fig. 4, the concave-convex alternating structure 4 is composed of a block-shaped protrusion and a groove in a staggered manner.
The block-shaped protrusions of the inner air cushion 2 are inserted into the grooves of the outer air cushion 3, and the block-shaped protrusions of the outer air cushion 3 are inserted into the grooves of the inner air cushion 2, so that the inner air cushion 2 is sealed and nested in the outer air cushion 3.
Preferably, as shown in fig. 5, the concave-convex alternate structure 4 is composed of annular grooves and annular protrusions, the outer cylinder wall of the first outer cylinder 203 is provided with a plurality of annular grooves and annular protrusions from top to bottom, and the inner cylinder wall of the second outer cylinder 303 is provided with a plurality of annular grooves and annular protrusions from top to bottom.
The annular bulge of the inner air cushion 2 is inserted into the annular groove of the outer air cushion 3, and the annular bulge of the outer air cushion 3 is inserted into the annular groove of the inner air cushion 2, so that the inner air cushion 2 is sealed and nested in the outer air cushion 3.
Fourth embodiment:
On the basis of the above embodiment, referring to fig. 2 and 3, the upper end surface of the inner air cushion 2 in contact with the bottom end surface of the plunger 1 and the upper end surface of the outer air cushion 3 in contact with the bottom end surface of the plunger 1 are coated with the adhesive 5, and the outer cylinder wall of the first outer cylinder 203 is coated with the adhesive 5.
In order to ensure a sealed connection of the plunger 1 and the double air cushion damper, the present embodiment preferably uses an adhesive 5, and as shown in fig. 2 and 3, all outer surfaces contacting the plunger 1, for example, an upper end surface of the inner air cushion 2, an upper end surface of the outer air cushion 3, and an outer cylinder wall of the first outer cylinder 203 are coated with the adhesive 5.
Fifth embodiment:
the embodiment protects an application method of the double-air cushion damping whole cylinder pump, which comprises the following steps:
firstly, embedding an inner air cushion 2 into an outer air cushion 3 to ensure that the inner air cushion 2 and the outer air cushion 3 are coaxially sleeved;
then, filling gas or liquid into the first annular hollow space 204 of the inner air cushion 2 and the second annular hollow space 304 of the outer air cushion 3 respectively, so that the pressure of the inner air cushion 2 is higher than that of the outer air cushion 3, and the concave-convex alternate structures 4 of the two are mutually extruded and meshed to form a sealing structure;
Finally, the double-air cushion damping device is fixedly connected to the bottom end surface of the plunger 1, so that the axial center oil passing channel 101 of the plunger 1 is ensured to be communicated with the fluid channel 201 of the inner air cushion 2, and the double-air cushion damping device is installed.
The double-air cushion damping whole cylinder pump comprises a plunger 1, an axial center oil passing channel 101 in the center of the plunger 1, and a double-air cushion damping device positioned right below the plunger 1, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion 2 and an outer air cushion 3, the outer air cushion 3 is sleeved on the outer wall of the inner air cushion 2, and a fluid channel 201 which is communicated with the axial center oil passing channel 101 of the plunger 1 in a sealing manner is formed in the center of the inner air cushion 2; the upper end face of the inner air cushion 2 and the upper end face of the outer air cushion 3 are both in sealing connection with the bottom end face of the plunger 1.
Specifically, as shown in fig. 2, the inner air cushion 2 is a cylindrical structure formed by coaxially sleeving a first inner cylinder 202 and a first outer cylinder 203, the axial center of the first inner cylinder 202 is a fluid channel 201 for passing through liquid up and down, a sealed first annular hollow space 204 is formed between the outer cylinder wall of the first inner cylinder 202 and the inner cylinder wall of the first outer cylinder 203, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the first annular hollow space 204.
Referring to fig. 3, the outer air cushion 3 is a circular cylindrical structure formed by coaxially sleeving a second inner cylinder 302 and a second outer cylinder 303, the axial center of the second inner cylinder 302 is a nesting channel 301 which is used for being embedded into the inner air cushion 2 and penetrates up and down, a sealed second annular hollow space 304 is formed between the outer cylinder wall of the second inner cylinder 302 and the inner cylinder wall of the second outer cylinder 303, and any one of gas, fluid, semi-fluid or liquid, preferably SF6 (sulfur hexafluoride) or C2F6 (hexafluoroethane) can be filled in the second annular hollow space 304.
Referring to fig. 2 and 3, the outer cylinder wall of the first outer cylinder 203 and the inner cylinder wall of the second outer cylinder 303 are both protruded outwards or recessed inwards to form a concave-convex alternate structure 4, and when the inner air cushion 2 is nested in the outer air cushion 3, the concave-convex alternate structures 4 on the two cylinder walls are mutually pressed and meshed.
The upper end surface of the inner air cushion 2 contacting the bottom end surface of the plunger 1 and the upper end surface of the outer air cushion 3 contacting the bottom end surface of the plunger 1 are coated with the adhesive 5, and the outer cylinder wall of the first outer cylinder 203 is coated with the adhesive 5.
In summary, the double-air cushion damping whole cylinder pump and the application method thereof are mainly realized by sealing and connecting a double-air cushion damping device on the bottom end surface of the plunger, wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion and an outer air cushion; meanwhile, in the descending process, the double-air cushion damping device firstly contacts the liquid level, and the stress is more uniform when the double-air cushion damping device contacts the liquid level due to the different pressures of the inner air cushion and the outer air cushion, so that the double-air cushion damping device is more suitable for different impact speeds and forces, the liquid impact action of the liquid level on the oil pump and even the whole oil well pipe string is greatly slowed down, and the purpose of prolonging the service lives of the oil pump and the oil well pipe string is achieved.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a whole section of thick bamboo pump of double air cushion shock attenuation, includes plunger (1) and plunger (1) central axial center oil passage (101), its characterized in that: the double-air cushion damping device is formed by coaxially sleeving an inner air cushion (2) and an outer air cushion (3), the outer air cushion (3) is sleeved on the outer wall of the inner air cushion (2), and a fluid channel (201) which is communicated with an axial center oil passing channel (101) of the plunger (1) in a sealing manner is formed in the center of the inner air cushion (2);
the upper end face of the inner air cushion (2) and the upper end face of the outer air cushion (3) are both in sealing connection with the bottom end face of the plunger (1);
The inner air cushion (2) is of a circular cylinder structure formed by coaxially sleeving a first inner cylinder (202) and a first outer cylinder (203), the outer air cushion (3) is of a circular cylinder structure formed by coaxially sleeving a second inner cylinder (302) and a second outer cylinder (303), the outer cylinder wall of the first outer cylinder (203) and the inner cylinder wall of the second outer cylinder (303) are both outwards protruded or inwards recessed to form a concave-convex alternate structure (4), and when the inner air cushion (2) is embedded in the outer air cushion (3), the concave-convex alternate structures (4) on the two cylinder walls are mutually extruded and meshed;
the concave-convex alternate structure (4) is formed by staggered block-shaped bulges and grooves;
The upper end face of the inner air cushion (2) contacted with the bottom end face of the plunger (1) and the upper end face of the outer air cushion (3) contacted with the bottom end face of the plunger (1) are coated with an adhesive (5), and the outer barrel wall of the first outer barrel (203) is coated with the adhesive (5).
2. The dual cushion shock absorbing integral cylinder pump as set forth in claim 1 wherein: the axial center of the first inner cylinder (202) is a fluid channel (201) which is used for passing through liquid up and down, and a sealed first annular hollow space (204) is arranged between the outer cylinder wall of the first inner cylinder (202) and the inner cylinder wall of the first outer cylinder (203).
3. The dual cushion shock absorbing integral cylinder pump as set forth in claim 2 wherein: the axial center of the second inner cylinder (302) is a nesting channel (301) which is used for being embedded into the inner air cushion (2) and penetrates through the inner cylinder from top to bottom, and a second annular hollow space (304) which is sealed is arranged between the outer cylinder wall of the second inner cylinder (302) and the inner cylinder wall of the second outer cylinder (303).
4. The dual cushion shock absorbing integral cylinder pump as set forth in claim 1 wherein: the concave-convex alternate structure (4) can also be composed of annular grooves and annular protrusions, the outer cylinder wall of the first outer cylinder (203) is provided with a plurality of annular grooves and annular protrusions from top to bottom at intervals, and the inner cylinder wall of the second outer cylinder (303) is provided with a plurality of annular grooves and annular protrusions from top to bottom at intervals.
5. A dual air cushion shock absorbing integral cylinder pump as set forth in claim 3 wherein: the first annular hollow space (204) and the second annular hollow space (304) can be filled with any one of fluid and semi-fluid.
6. The dual cushion shock absorbing integral cylinder pump as set forth in claim 5 wherein: the internal pressure of the first annular hollow space (204) is greater than the internal pressure of the second annular hollow space (304).
7. An application method of a double-air cushion damping whole cylinder pump is characterized by comprising the following steps of:
The double-air cushion damping whole cylinder pump comprises a plunger (1) and an axial center oil passing channel (101) in the center of the plunger (1), and further comprises a double-air cushion damping device positioned right below the plunger (1), wherein the double-air cushion damping device is formed by coaxially sleeving an inner air cushion (2) and an outer air cushion (3), the outer air cushion (3) is sleeved on the outer wall of the inner air cushion (2), and a fluid channel (201) which is communicated with the axial center oil passing channel (101) of the plunger (1) in a sealing manner is formed in the center of the inner air cushion (2);
the upper end face of the inner air cushion (2) and the upper end face of the outer air cushion (3) are both in sealing connection with the bottom end face of the plunger (1);
The inner air cushion (2) is of a circular cylinder structure formed by coaxially sleeving a first inner cylinder (202) and a first outer cylinder (203), the axial center of the first inner cylinder (202) is a fluid channel (201) for passing through liquid up and down, and a sealed first annular hollow space (204) is formed between the outer cylinder wall of the first inner cylinder (202) and the inner cylinder wall of the first outer cylinder (203);
the outer air cushion (3) is of a circular cylinder structure formed by coaxially sleeving a second inner cylinder (302) and a second outer cylinder (303), the axial center of the second inner cylinder (302) is a nesting channel (301) which is used for being embedded into the inner air cushion (2) and penetrates up and down, and a sealed second annular hollow space (304) is formed between the outer cylinder wall of the second inner cylinder (302) and the inner cylinder wall of the second outer cylinder (303);
The outer cylinder wall of the first outer cylinder (203) and the inner cylinder wall of the second outer cylinder (303) are outwards raised or inwards recessed to form a concave-convex alternate structure (4), and when the inner air cushion (2) is nested in the outer air cushion (3), the concave-convex alternate structures (4) on the two cylinder walls are mutually extruded and meshed;
The application method comprises the following steps:
Firstly, embedding an inner air cushion (2) into an outer air cushion (3), and ensuring that the inner air cushion (2) and the outer air cushion (3) are coaxially sleeved;
Then, filling gas or liquid into a first annular hollow space (204) of the inner air cushion (2) and a second annular hollow space (304) of the outer air cushion (3) respectively, so that the pressure of the inner air cushion (2) is higher than that of the outer air cushion (3), and the concave-convex alternative structures (4) of the inner air cushion and the outer air cushion are mutually extruded and meshed to form a sealing structure;
And finally, fixedly connecting the double-air-cushion damping device to the bottom end surface of the plunger (1), ensuring that the oil passing channel (101) in the axial center of the plunger (1) is communicated with the fluid channel (201) of the inner air cushion (2), and finishing the installation of the double-air-cushion damping device.
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| CN2556364Y (en) * | 2002-07-26 | 2003-06-18 | 大庆油田有限责任公司 | Downhole oil-water separating device for continuous oil feeding oil well pump |
| CN205479068U (en) * | 2016-01-22 | 2016-08-17 | 青岛科技大学 | Modular shock absorber |
| CN211874716U (en) * | 2019-12-30 | 2020-11-06 | 中国石油天然气股份有限公司 | Double-air-cushion damping whole barrel pump |
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