CA2331932A1 - The mechanical load equalizer - Google Patents
The mechanical load equalizer Download PDFInfo
- Publication number
- CA2331932A1 CA2331932A1 CA002331932A CA2331932A CA2331932A1 CA 2331932 A1 CA2331932 A1 CA 2331932A1 CA 002331932 A CA002331932 A CA 002331932A CA 2331932 A CA2331932 A CA 2331932A CA 2331932 A1 CA2331932 A1 CA 2331932A1
- Authority
- CA
- Canada
- Prior art keywords
- sucker rods
- piston
- inner cylinder
- mechanical load
- load equalizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000005086 pumping Methods 0.000 claims abstract description 15
- 230000006835 compression Effects 0.000 claims abstract description 14
- 238000007906 compression Methods 0.000 claims abstract description 14
- 239000012530 fluid Substances 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 10
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 claims description 5
- 229910052753 mercury Inorganic materials 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims 1
- 235000020681 well water Nutrition 0.000 claims 1
- 239000002349 well water Substances 0.000 claims 1
- 239000003208 petroleum Substances 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000009434 installation Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
- E21B43/126—Adaptations of down-hole pump systems powered by drives outside the borehole, e.g. by a rotary or oscillating drive
-
- 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
- F04B47/02—Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
- F04B47/026—Pull rods, full rod component parts
Landscapes
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
Abstract
The mechanical load equalizer concerns to petroleum engineering. It could be used in the mechanical pumping system. The mechanical load equalizer consists in a reduction of loading of the sucker rods by helical compression springs mounted in it. The failures of the sucker rod string are due to the weight of well-pumped fluids on the piston of the bottom-reciprocating pump. The reduction of the failures of sucker rods results in their increase of work services.
The sucker rods in a reciprocating pumping system are the most important elements between the bottom reciprocating pump and superficial mechanical pumping unit.
The mechanical load equalizer is a unique mechanism, which is installed over the reciprocating pump to reduce the stress of the sucker rods.
The sucker rods are submitted to many efforts in the pumping process that act into failures. They have many connections and are actually the weakest part of this artificial lifting system. The weight on the sucker rods develops of the following basic forces: 1) static load from weight of sucker rods and fluids on it.
The friction forces of sucker rods on the inner surface of the pipelines and the friction force between the piston and surrounding casing cylinder of reciprocating pump. 2) A force of inertia of driving weights; 3) various dynamic loads.
The sucker rods could be broken due to metallic fatigue.
During the pumping process the production pipelines work in a considerable safe range of load. A packer connects the mechanical load equalizer with the production pipelines thus, it helps to sucker rods to decrease the stress forces.
The sucker rods in a reciprocating pumping system are the most important elements between the bottom reciprocating pump and superficial mechanical pumping unit.
The mechanical load equalizer is a unique mechanism, which is installed over the reciprocating pump to reduce the stress of the sucker rods.
The sucker rods are submitted to many efforts in the pumping process that act into failures. They have many connections and are actually the weakest part of this artificial lifting system. The weight on the sucker rods develops of the following basic forces: 1) static load from weight of sucker rods and fluids on it.
The friction forces of sucker rods on the inner surface of the pipelines and the friction force between the piston and surrounding casing cylinder of reciprocating pump. 2) A force of inertia of driving weights; 3) various dynamic loads.
The sucker rods could be broken due to metallic fatigue.
During the pumping process the production pipelines work in a considerable safe range of load. A packer connects the mechanical load equalizer with the production pipelines thus, it helps to sucker rods to decrease the stress forces.
Description
2. THE MECHANICAL LOAD EQUALIZER
The mechanical load equalizer in a reciprocating pumping system for the operation of oil wells is represented with a mechanism, which is located between the reciprocating pump and a string of production pipE~lines.
The mechanical equalizer contains a main cylinder with longitudinal channels, an inner cylinder with packers, a inner helical compression springs, a top removable flange with apertures, a bottom removable flange, an inner piston, a polished bars, a protecting piston fluid (it could be the mercury;) The mechanical load equalizer is a novel that consists in the load reduction of sucker rods of the reciprocating pumping system.
Figs. 1-2 show the mechanical load equalizer acting upwards and downwards.
The mechanical equalizer is connected from the top with the production pipelines and from the bottom with the reciprocating pump (not shown).
When the pumping process is acting, the exti°acted well fluids by the reciprocating pump pass through the longitudinal channels of the mechanical load equalizer from the bottom to the top and continue going up through the pipelines to the ground surface.
The piston is connected with the polished bar fronn the top and bottom. The bottom-polished bar is connected with reciprocating pump piston (not shown).
Both, piston and polished bar of the mechanical load equalizer reduce the load of the above sucker rods because the inner helical corr~pression springs helps it to lift up the weight. The helical compression springs push up the piston located on its top and the sucker rods are going at the same time up. It will be understood that the helical compression springs helps the sucker rods to lift up the well mixture. The springs are compressed when the piston of the reciprocating pump (not shown) is going down due to the load on it The sucker rods could work with less stress due i:o installation of the helical compression springs.
The inner sealing packers of the mechanical load equalizer seal the passageway forward through the inner annular zone between the inner cylinder and inner cylinder of the main cylinder. They block the passageway of the bottom well mixture forward and force it to pass through the longii:udinal channels.
From the top, the inner cylinder has a removable cover flange with the four apertures. It is fixed in the inner cylinder on screw threats.
The apertures serve to release the pressure caused by the solid piston inside the inner cylinder. The inner cylinder is filled up with the protecting fluid.
This protecting fluid could be the mercury. The well mixture (water, oil and sand) enters into the inner cylinder through the apertures of the cover removable flange and could wear off the surfaces of the inner piston arid the outside surface of the helical compression springs, which are moved on the inner surface of the inner cylinder.
The sealing removable flange isolates the bottom side of the inner cylinder.
The bottom flange compresses the stufFng material ta~ avoid the leakage of the protecting material from the inner cylinder. The compressed stuffing material is installed between the sealing flange and bottom sealing removable flange.
The mechanical load equalizer is a unique mechanism, which reduces the weight on the reciprocating pump piston due to the springs.
The mechanical load equalizer Figs.1-2 has a main cylinder 1 with an outside diameter of D=4.0 in, inside diameter d = 2.9 in, and length L=65.6 Feet. The inner cylinder T has outside diameter is D=2.6 in, inside diameter is d=2.3 in and the length 62 Feet. The main cylinder 1 has in the bottom an inner ring 20 with diameter = 2.6 in and thickness S =4 in (on distance of 10 in from the bottom edge). The inner cylinder 7 with packers 6,10,11 is stopped in this ring.
The mechanical load equalizer in a reciprocating pumping system for the operation of oil wells is represented with a mechanism, which is located between the reciprocating pump and a string of production pipE~lines.
The mechanical equalizer contains a main cylinder with longitudinal channels, an inner cylinder with packers, a inner helical compression springs, a top removable flange with apertures, a bottom removable flange, an inner piston, a polished bars, a protecting piston fluid (it could be the mercury;) The mechanical load equalizer is a novel that consists in the load reduction of sucker rods of the reciprocating pumping system.
Figs. 1-2 show the mechanical load equalizer acting upwards and downwards.
The mechanical equalizer is connected from the top with the production pipelines and from the bottom with the reciprocating pump (not shown).
When the pumping process is acting, the exti°acted well fluids by the reciprocating pump pass through the longitudinal channels of the mechanical load equalizer from the bottom to the top and continue going up through the pipelines to the ground surface.
The piston is connected with the polished bar fronn the top and bottom. The bottom-polished bar is connected with reciprocating pump piston (not shown).
Both, piston and polished bar of the mechanical load equalizer reduce the load of the above sucker rods because the inner helical corr~pression springs helps it to lift up the weight. The helical compression springs push up the piston located on its top and the sucker rods are going at the same time up. It will be understood that the helical compression springs helps the sucker rods to lift up the well mixture. The springs are compressed when the piston of the reciprocating pump (not shown) is going down due to the load on it The sucker rods could work with less stress due i:o installation of the helical compression springs.
The inner sealing packers of the mechanical load equalizer seal the passageway forward through the inner annular zone between the inner cylinder and inner cylinder of the main cylinder. They block the passageway of the bottom well mixture forward and force it to pass through the longii:udinal channels.
From the top, the inner cylinder has a removable cover flange with the four apertures. It is fixed in the inner cylinder on screw threats.
The apertures serve to release the pressure caused by the solid piston inside the inner cylinder. The inner cylinder is filled up with the protecting fluid.
This protecting fluid could be the mercury. The well mixture (water, oil and sand) enters into the inner cylinder through the apertures of the cover removable flange and could wear off the surfaces of the inner piston arid the outside surface of the helical compression springs, which are moved on the inner surface of the inner cylinder.
The sealing removable flange isolates the bottom side of the inner cylinder.
The bottom flange compresses the stufFng material ta~ avoid the leakage of the protecting material from the inner cylinder. The compressed stuffing material is installed between the sealing flange and bottom sealing removable flange.
The mechanical load equalizer is a unique mechanism, which reduces the weight on the reciprocating pump piston due to the springs.
The mechanical load equalizer Figs.1-2 has a main cylinder 1 with an outside diameter of D=4.0 in, inside diameter d = 2.9 in, and length L=65.6 Feet. The inner cylinder T has outside diameter is D=2.6 in, inside diameter is d=2.3 in and the length 62 Feet. The main cylinder 1 has in the bottom an inner ring 20 with diameter = 2.6 in and thickness S =4 in (on distance of 10 in from the bottom edge). The inner cylinder 7 with packers 6,10,11 is stopped in this ring.
The main cylinder 1 has four longitudinal channels 9 with diameter 0.7 in and length 64 Feet. The longitudinal channels 9 have outlet ports and inlet ports with diameters of 0.7 in each one.
The inner cylinder 7 has inside a piston 4 diameter of 2.3 in and length of 10 in. It has two apertures 5 diameter of 3 in.
The inner solid piston 4 is connected with the polished bars 2 and 15 diameter of 1 in and length of 37.5 Feet from the top and the bottom sides. The inner cylinder 7 is frlled up with a protecting fluid (Mercury).
The inner cylinder 7 has an inner sealing flange 12 'with outside diameter of 2.3 in, inside diameter of 1 in and thickness of 2 in. It is fixed on 6 in from the bottom edge. The removable flange 14 has outside diameter of 2.3 in, inside diameter of 1 in and thickness of 2 in. It is installed in the bottom of the inner cylinder 7. This flange 14 can slide on the surface of the inner cylinder 7. The stuffing material 13 is installed and compressed between the sealing flange 12 and the sliding flange 14 by the cover removable flange 15. This cover rem~avable flange 15 is mounted on a base flange of the inner cylinder 7 by bolts (eight bolts). The cover removable flange has outside diameter of 2.7 in, inside diameter of 1 in, and thickness of 3 in.
The top removable flange 3 close by screw threai~s, the topside of the inner cylinder 7 has an outside diameter of 2.6 in, inside diameter of 1 in, and thickness of 3 in.
Between the outside diameter and the inside diametE~r, the top removable flange has two apertures diameter 1.4 in each one. The apertures serve to release the inner pressure of the inner cylinder 7 that could be caused by the piston 4.
The novel of this invention is to increase the sucker rod work service. It reduces the sucker rod stress and the its breaks.
The sucker rods in a reciprocating pumping systern have to work in the safe range of stress. The sucker rods are ~exible due to the heavy weight, which it has to lift up. By time of services the sucker rod:. wilt break due to metallic fatigue. The mechanical load equalizer helps the sucker rods of the reciprocating pump (not shown) to lift up the well mixture (well fluids -water and oil- and sand in it).
The mechanical load equalizer for the reciprocating pumping system is represented in the Fig. 1- The mechanical load equalizer acting upwards. The Fig. 2- The mechanical load equalizer acting downwards.
The mechanical load equalizer helps the reduction of the load on the head of the pumping unit as well. Because, the mechanical load equalizer is connected with the reciprocating pump and pump with the bottom :pealing packer. The bottom-sealing packer (not shown} is installed on the casing pipelines. It means that the bottom-sealing packer (not shown) supports part of the well-extracted mixture.
The scheme of the connections from the bottom to the top is the following:
first is installed the bottom-sealing packer. With it is installed the reciprocating pump and with the reciprocating pump is connected the mechanical load equalizer.
The mechanical load equalizer is connected from the top with the production pipelines.
When the sucker rods of the reciprocating pump (noiu shown) act upwards by the pumping unit, which is located on the ground surface, the reciprocating pump pumps up the bottom well mixture into the longitudinal channels 9 of the mechanical load equalizer. The mixture flows upwards through the pipelines forward to the ground surface.
The inner cylinder 7 is fixed into the inner surtace of the main cylinder 1 by three packers 6,10,11. (Figs. 1-2). The inner cylinder 7 i:; stopped by a stopper 19, which is installed inside of the main cylinder 1. The cylinder 1 is connected from the top with the production pipeline 17 and from the k>ottom with the reciprocating pump on threats 18.
When the sucker rods move down (The sucker rods. are connected with the top polished bar of the mechanical load equalizer) then piston 4 compresses the helical compression springs 8. The springs 8 are mounted in the inner cylinder 7.
The springs are manufactured with outside diameter of 2.2 in and length of 1 Feet each one (In total the mechanical load equalizer has 60 springs). The active coils of the springs have a diameter of coil 0.6 in and the coil pitch is 0.6 in as well. The helical compression springs are made vrith Squared ends ground share.
The inner cylinder 7 has inside a piston 4 diameter of 2.3 in and length of 10 in. It has two apertures 5 diameter of 3 in.
The inner solid piston 4 is connected with the polished bars 2 and 15 diameter of 1 in and length of 37.5 Feet from the top and the bottom sides. The inner cylinder 7 is frlled up with a protecting fluid (Mercury).
The inner cylinder 7 has an inner sealing flange 12 'with outside diameter of 2.3 in, inside diameter of 1 in and thickness of 2 in. It is fixed on 6 in from the bottom edge. The removable flange 14 has outside diameter of 2.3 in, inside diameter of 1 in and thickness of 2 in. It is installed in the bottom of the inner cylinder 7. This flange 14 can slide on the surface of the inner cylinder 7. The stuffing material 13 is installed and compressed between the sealing flange 12 and the sliding flange 14 by the cover removable flange 15. This cover rem~avable flange 15 is mounted on a base flange of the inner cylinder 7 by bolts (eight bolts). The cover removable flange has outside diameter of 2.7 in, inside diameter of 1 in, and thickness of 3 in.
The top removable flange 3 close by screw threai~s, the topside of the inner cylinder 7 has an outside diameter of 2.6 in, inside diameter of 1 in, and thickness of 3 in.
Between the outside diameter and the inside diametE~r, the top removable flange has two apertures diameter 1.4 in each one. The apertures serve to release the inner pressure of the inner cylinder 7 that could be caused by the piston 4.
The novel of this invention is to increase the sucker rod work service. It reduces the sucker rod stress and the its breaks.
The sucker rods in a reciprocating pumping systern have to work in the safe range of stress. The sucker rods are ~exible due to the heavy weight, which it has to lift up. By time of services the sucker rod:. wilt break due to metallic fatigue. The mechanical load equalizer helps the sucker rods of the reciprocating pump (not shown) to lift up the well mixture (well fluids -water and oil- and sand in it).
The mechanical load equalizer for the reciprocating pumping system is represented in the Fig. 1- The mechanical load equalizer acting upwards. The Fig. 2- The mechanical load equalizer acting downwards.
The mechanical load equalizer helps the reduction of the load on the head of the pumping unit as well. Because, the mechanical load equalizer is connected with the reciprocating pump and pump with the bottom :pealing packer. The bottom-sealing packer (not shown} is installed on the casing pipelines. It means that the bottom-sealing packer (not shown) supports part of the well-extracted mixture.
The scheme of the connections from the bottom to the top is the following:
first is installed the bottom-sealing packer. With it is installed the reciprocating pump and with the reciprocating pump is connected the mechanical load equalizer.
The mechanical load equalizer is connected from the top with the production pipelines.
When the sucker rods of the reciprocating pump (noiu shown) act upwards by the pumping unit, which is located on the ground surface, the reciprocating pump pumps up the bottom well mixture into the longitudinal channels 9 of the mechanical load equalizer. The mixture flows upwards through the pipelines forward to the ground surface.
The inner cylinder 7 is fixed into the inner surtace of the main cylinder 1 by three packers 6,10,11. (Figs. 1-2). The inner cylinder 7 i:; stopped by a stopper 19, which is installed inside of the main cylinder 1. The cylinder 1 is connected from the top with the production pipeline 17 and from the k>ottom with the reciprocating pump on threats 18.
When the sucker rods move down (The sucker rods. are connected with the top polished bar of the mechanical load equalizer) then piston 4 compresses the helical compression springs 8. The springs 8 are mounted in the inner cylinder 7.
The springs are manufactured with outside diameter of 2.2 in and length of 1 Feet each one (In total the mechanical load equalizer has 60 springs). The active coils of the springs have a diameter of coil 0.6 in and the coil pitch is 0.6 in as well. The helical compression springs are made vrith Squared ends ground share.
Claims (11)
1. A mechanical load equalizer
2. The said mechanical load equalizer contains a main cylinder with longitudinal channels, an inner cylinder, a inner piston, a polished bars, a cover removable flanges of the inner cylinder, a helical compression springs, a sealing packers and stuffing material, a protecting fluid (mercury).
3. According to claim 1,2 a said main cylinder wherein said helical compression springs are mounted inside the inner cylinder and between the piston and stopper ring 19. The helical compression springs are compressed due to well load mixture when the piston of the reciprocating pump (not shown) is going down. The helical compression springs kept the energy meanwhile the piston of the reciprocating pump is pulled up by the sucker rods, the energy of helical compression springs helps to lift up the well load mixture.
4. According to claim 1,2, a said main cylinder wherein said longitudinal channels serve as passageway of the pumped well mixture by reciprocating pump (not shown) from the bottom to the surface.
5. A said inner cylinder, according to claim 1 has outside three packers, therewith is fixed to the inner surface of the main cylinder 1.
6. A said inner cylinder, according to claim 1, is filled up with the protecting fluid. This protecting fluid should have density much more, than density of sand 2.2 gr/cm3, density of well water ex. 1.2 gr/cm3, and density of oil ex.
0.8 gr/cm3. At meantime the protecting fluid doesn't mix with any substances or materials above described (The mercury could be used).
0.8 gr/cm3. At meantime the protecting fluid doesn't mix with any substances or materials above described (The mercury could be used).
7. A said top removable flange with apertures, according to claims 1 to 6 seals the said inner cylinder from the topside. The said apertures serve to release the pressure in the inner cylinder, which could be caused by the inner solid piston and the helical compression springs.
8. According to claim 1 to 7 a said polished bars are connected with the wherein said piston from the top and bottom sides. They slide through the inner apertures of the removable cover flanges and inner stopper flange of the inner cylinder and inner stopper flange.
9. A said stuffing material according to claim 1 seals the passageway between the inner cylinder and the internal surface of the main cylinder, when it is going on a pumping process of well mixture. The inner stopper flange and bottom removable cover flange of the inner cylinder compresses the said stuffing material. As the stuffing material could be used the same material, which is used in the stuffing box of the artificial lift system by mechanical pumping units.
10. According to claims 1 to 9, a said mechanical load equalizer reduces the weight on the piston of the reciprocating pump. That means it reduce a hydraulic column of the reciprocating pumping system to protect the sucker rods of breaks. The sucker rods have a wear of its material during the work period. The stress forces cause the failures of the sucker rods.
11. A said mechanical load equalizer, according to claims 1 to 10, the mechanical load equalizer is connected with the production pipeline from the top and with a reciprocating pump from the bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002331932A CA2331932A1 (en) | 2001-01-23 | 2001-01-23 | The mechanical load equalizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002331932A CA2331932A1 (en) | 2001-01-23 | 2001-01-23 | The mechanical load equalizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2331932A1 true CA2331932A1 (en) | 2002-07-23 |
Family
ID=4168141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002331932A Abandoned CA2331932A1 (en) | 2001-01-23 | 2001-01-23 | The mechanical load equalizer |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2331932A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852225A (en) * | 2012-11-29 | 2014-06-11 | 中国石油天然气集团公司 | Internal-pressure fatigue test device for well-completion pipe string of underground gas storage reservoir and test method thereof |
| WO2016009302A2 (en) | 2014-07-15 | 2016-01-21 | Yorio Pablo Martín | Load reduction device for deep well pumping systems and pumping system comprising said device |
| CN110542353A (en) * | 2018-05-29 | 2019-12-06 | 昆山东方同创自动化设备有限公司 | body bottom sealing device of paper tube |
| CN114263440A (en) * | 2020-09-16 | 2022-04-01 | 中国石油天然气股份有限公司 | Device for preventing polished rod from dropping |
-
2001
- 2001-01-23 CA CA002331932A patent/CA2331932A1/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103852225A (en) * | 2012-11-29 | 2014-06-11 | 中国石油天然气集团公司 | Internal-pressure fatigue test device for well-completion pipe string of underground gas storage reservoir and test method thereof |
| CN103852225B (en) * | 2012-11-29 | 2016-06-08 | 中国石油天然气集团公司 | The intrinsic pressure fatigue experimental device of underground natural gas storage tank completion tubular column and test method thereof |
| WO2016009302A2 (en) | 2014-07-15 | 2016-01-21 | Yorio Pablo Martín | Load reduction device for deep well pumping systems and pumping system comprising said device |
| CN110542353A (en) * | 2018-05-29 | 2019-12-06 | 昆山东方同创自动化设备有限公司 | body bottom sealing device of paper tube |
| CN110542353B (en) * | 2018-05-29 | 2024-02-20 | 昆山东方同创自动化设备有限公司 | Body back cover device of fiber container |
| CN114263440A (en) * | 2020-09-16 | 2022-04-01 | 中国石油天然气股份有限公司 | Device for preventing polished rod from dropping |
| CN114263440B (en) * | 2020-09-16 | 2023-11-28 | 中国石油天然气股份有限公司 | Device for preventing polished rod from falling |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |