CN109441392B - Packing box for wellhead of oil pumping unit - Google Patents
Packing box for wellhead of oil pumping unit Download PDFInfo
- Publication number
- CN109441392B CN109441392B CN201811522992.9A CN201811522992A CN109441392B CN 109441392 B CN109441392 B CN 109441392B CN 201811522992 A CN201811522992 A CN 201811522992A CN 109441392 B CN109441392 B CN 109441392B
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- Prior art keywords
- polished rod
- packing
- box body
- rubber
- oil
- Prior art date
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- 238000012856 packing Methods 0.000 title claims abstract description 82
- 238000005086 pumping Methods 0.000 title claims abstract description 18
- 238000007790 scraping Methods 0.000 claims abstract description 37
- 238000003825 pressing Methods 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 26
- 238000007789 sealing Methods 0.000 claims description 27
- 239000004576 sand Substances 0.000 claims description 20
- 210000004907 gland Anatomy 0.000 claims description 12
- 229920000742 Cotton Polymers 0.000 claims description 8
- 230000000694 effects Effects 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000011084 recovery Methods 0.000 abstract description 4
- 238000010030 laminating Methods 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 43
- 239000010687 lubricating oil Substances 0.000 description 21
- 239000010779 crude oil Substances 0.000 description 8
- 230000008034 disappearance Effects 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000009837 dry grinding Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000035508 accumulation Effects 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 210000001138 tear Anatomy 0.000 description 1
Images
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
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/02—Surface sealing or packing
- E21B33/03—Well heads; Setting-up thereof
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (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)
- Sealing Devices (AREA)
Abstract
The invention relates to the technical field of oilfield exploitation equipment, and discloses a packing box for a wellhead of a pumping unit, which comprises a box body, wherein a pressing sleeve is arranged at the top of an inner cavity of the box body, a pressing cover is arranged at the top of the box body, a cover plate is arranged at the top of the pressing cover, a polished rod is arranged at the top of the cover plate, the bottom end of the polished rod sequentially penetrates through the cover plate, the pressing cover, the pressing sleeve and the box body, and a storage cavity is formed in the pressing cover. Through the setting of seting up the bell mouth inside the scraping rubber, make the top and the polished rod surface laminating of scraping rubber inner wall, and then when making polished rod downstream, scraping rubber can scrape the grit on polished rod surface, avoid the grit to get into and between the polished rod along with the polished rod motion, make and form the sanding between sealed packing and the polished rod, the problem that leads to sealed packing wearing and tearing speed to accelerate, the life of sealed packing has been prolonged, the frequency of changing sealed packing has been reduced, the shut-in time has been shortened, make oil recovery efficiency improve, and production cost reduces.
Description
Technical Field
The invention relates to the technical field of oilfield exploitation equipment, in particular to a packing box for a wellhead of an oil pumping unit.
Background
The packing box is the device that seals up the polished rod at the beam-pumping unit well head, be the important component part that prevents oil excessive, mainly by pressing the cap, press the cover, the box body, bush and packing etc. are constituteed, the cover is established in the outside of beam-pumping unit polished rod, the lower extreme is fixed in on the wellhead assembly, when the operation of pumping, the relative packing box up-and-down repetitive motion of beam-pumping unit polished rod, its theory of operation is through pressing the cap will press the cover box body of impressing, press the cover to extrude the packing, make packing axial and radial emergence be out of shape, and then make the packing hug closely polished rod and box body outer wall, realize sealing, but current packing box still has following problem:
1. the packing box is all installed in the open air, and the sand blown by the wind adheres to the surface at the polished rod, gets into between packing and the polished rod along with the polished rod, makes and forms the sanding between polished rod and the packing for the wearing and tearing speed of packing, form the gap very fast between packing and the polished rod and run out oil, packing life is very short, needs frequently to stop the beam-pumping unit and change the packing, makes the short-term shut down of oil well, has increased the operation number of times and shut down the well time, makes oil recovery efficiency reduce, and manufacturing cost increases.
2. Take out the packing after soaking in lubricating oil and install in the packing box to reduce the frictional force between packing and the polished rod, nevertheless, lubricating oil in the packing can reduce gradually at the in-process of polished rod up-and-down motion, makes to form between packing and the polished rod and dry and grinds, leads to the packing wearing and tearing speed to accelerate, has shortened the life of packing.
Aiming at the problems, the invention provides a packing box for a wellhead of an oil pumping unit.
Disclosure of Invention
The invention provides a packing box for a wellhead of a pumping unit, which can remove gravel attached to the surface of a polished rod, avoid the problem that the gravel enters between a sealing packing and the polished rod to form sand grinding between the polished rod and the sealing packing, and simultaneously can supplement lubricating oil for the sealing packing to avoid the problem that the lubricating oil in the sealing packing is consumed up to form dry grinding between the sealing packing and the polished rod.
The invention provides the following technical scheme: the utility model provides a packing box for beam-pumping unit well head, includes the box body, the top of box body inner chamber is equipped with the pressure cover, the top of box body is equipped with the gland, the top of gland is equipped with the apron, the top of apron is equipped with the polished rod, the bottom of polished rod runs through apron, gland, pressure cover and box body in proper order, the storage chamber has been seted up to the inside of gland, the outside activity of polished rod has been cup jointed and has been separated oil pipe, separate oil pipe's bottom and be connected with the bottom surface in storage chamber, the outside activity of polished rod has cup jointed the rubber bag, the top of rubber bag is equipped with the frictioning rubber, the left and right sides face of gland all is equipped with the installation handle, the top of box body inner wall is equipped with the seal groove, the inside of seal groove is equipped with O type sealing washer, the outside winding of polished.
Further, the cover plate is fixedly connected with the gland through bolts.
Further, an oil storage tank is formed between the inner wall of the storage cavity and the outer wall of the oil separation pipe.
Furthermore, the bottom surface of the storage cavity is provided with an annular cotton block positioned in the oil isolating pipe, and the annular cotton block is movably sleeved with the polish rod.
Further, the inner diameter value of the oil isolating pipe is larger than the outer diameter value of the rubber bag.
Furthermore, the shape of the scraping rubber is conical, and the diameter value of the bottom surface of the scraping rubber is larger than the outer diameter value of the oil separating pipe.
Furthermore, the inside of the scraping rubber is provided with a tapered hole, the diameter value of the top of the tapered hole is smaller than that of the polish rod, and the diameter value of the bottom of the tapered hole is the same as that of the inner diameter of the rubber bag.
The invention has the following beneficial effects:
1. through the setting of seting up the bell mouth inside the scraping rubber, make the top and the polished rod surface laminating of scraping rubber inner wall, and then when making polished rod downstream, scraping rubber can scrape the grit on polished rod surface, avoid the grit to get into and between the polished rod along with the polished rod motion, make and form the sanding between sealed packing and the polished rod, the problem that sealed packing wearing and tearing speed is accelerated, the life of sealed packing has been prolonged, the frequency of changing sealed packing has been reduced, the shut-in time has been shortened, make oil recovery efficiency improve, and production cost reduces.
2. Be greater than the setting of oil separator outside diameter value for conical setting and sand scraping rubber bottom surface diameter value through sand scraping rubber, make the grit that is struck off along sand scraping rubber's surface landing to the oil storage tank in, and then make the lubricating oil overflow in the oil storage tank to the inside of oil separator pipe, make lubricating oil along the polished rod with the gland with press the clearance between the cover to dip in the sealed packing, the lubricating oil of disappearance in the supplementary sealed packing, it is serious to avoid lubricating oil disappearance in the sealed packing, make to form dry grinding between sealed packing and the polished rod, lead to the problem that sealed packing wearing and tearing speed accelerates, the life of sealed packing has been prolonged.
3. Through the setting of separating oil pipe, make the crude oil that sealed packing wearing and tearing run out at first get into the inside that separates oil pipe, utilize the buoyancy of rubber bag in crude oil to promote the rubber rebound of scraping sand, make the top of scraping sand rubber live with the clearance seal between polished rod and the apron, avoid crude oil to reveal, strive for sufficient maintenance duration for the maintenance personal simultaneously.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the internal structure of FIG. 1;
FIG. 3 is a schematic cross-sectional view taken along line A-A of FIG. 1;
FIG. 4 is a schematic structural diagram of a seal packing when worn out and running oil;
fig. 5 is a schematic view of the internal structure of the scraping rubber in fig. 2.
In the figure: 1-box body, 2-pressing sleeve, 3-pressing cover, 4-cover plate, 5-polish rod, 6-storage cavity, 7-oil separating pipe, 8-annular cotton block, 9-rubber bag, 10-scraping rubber, 11-mounting handle, 12-sealing groove, 13-O-shaped sealing ring, 14-sealing packing and 15-gasket.
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.
Referring to fig. 1-5, a packing box for a well head of a pumping unit comprises a box body 1, a pressing sleeve 2 is arranged at the top of an inner cavity of the box body 1, a pressing cover 3 is arranged at the top of the box body 1, a cover plate 4 is arranged at the top of the pressing cover 3, a polish rod 5 is arranged at the top of the cover plate 4, the bottom end of the polish rod 5 sequentially penetrates through the cover plate 4, the pressing cover 3, the pressing sleeve 2 and the box body 1, the exterior of the polish rod 5 is movably sleeved with the cover plate 4, the pressing cover 3, the pressing sleeve 2 and the box body 1, a storage cavity 6 is arranged inside the pressing cover 3, an oil separating pipe 7 is movably sleeved outside the polish rod 5, the bottom end of the oil separating pipe 7 is connected with the bottom surface of the storage cavity 6, a rubber bag 9 is movably sleeved outside the polish rod 5, sand scraping rubber 10 is arranged at the top of the rubber bag 9, mounting handles 11 are arranged on the, the inside of seal groove 12 is equipped with O type sealing washer 13, the outside winding of polished rod 5 has the sealed packing 14 that is located box body 1 inside, the bottom surface of the 1 inner chamber of box body is equipped with liner 15, and liner 15 activity cup joints the outside at polished rod 5.
Apron 4 passes through bolt and 3 fixed connection of gland, makes people can dismantle gland 3 and apron 4 and open, makes things convenient for people to clear up the inside grit of storage chamber 6, avoids 6 inside accumulations too many grits of storage chamber, makes grit and polished rod 5 contact, wears and teares polished rod 5, leads to the problem of frictional force increase between polished rod 5 and the sealed packing 14, has prolonged the life of sealed packing 14.
An oil storage groove is formed between the inner wall of the storage cavity 6 and the outer wall of the oil separation pipe 7, and the oil storage groove plays a role in storing lubricating oil and accommodating gravel.
The bottom surface of storage chamber 6 is equipped with and is located the cotton piece 8 of annular that separates oil pipe 7 inside, the cotton piece 8 of annular cup joints with the activity of polished rod 5, utilizes the inside clearance of the cotton piece 8 of annular to advance to separate the inside lubricating oil of oil pipe 7 to the overflow and filters, with the gravel filtering in the lubricating oil, avoids floating between the gravel on lubricating oil surface gets into polished rod 5 and sealed packing 14 along with lubricating oil, makes the problem that forms the sanding between polished rod 5 and the sealed packing 14, has prolonged the life of sealed packing 14.
The internal diameter value of oil separating pipe 7 is greater than the external diameter value of rubber bag 9, makes rubber bag 9 can the up-and-down motion in the inside of oil separating pipe 7, ensures that sealed packing 14 wearing and tearing, and crude oil gets into oil separating pipe 7 back, and rubber bag 9 can float in crude oil, makes rubber bag 9 promote the upward movement of scraping sand rubber 10, live the gap seal between polished rod 5 and apron 4, avoids crude oil to reveal, strives for sufficient maintenance duration simultaneously for the maintenance personal.
The shape of scraping sand rubber 10 is the toper, the diameter value of scraping sand rubber 10 bottom surface is greater than the external diameter value of oil separating pipe 7, make the grit that is scraped by scraping sand rubber 10 slide to the oil storage tank along scraping sand rubber 10's surface, and then make the inside of the lubricating oil overflow to oil separating pipe 7 in the oil storage tank, make lubricating oil along the polished rod with gland 3 and the clearance between the pressure sleeve 2 dip in sealed packing 14, the lubricating oil of disappearance in the supplementary sealed packing 14, it is serious to avoid lubricating oil disappearance in the sealed packing 14, make and form dry grinding between sealed packing 14 and the polished rod 5, lead to the problem that sealed packing 14 wearing and tearing speed accelerates, sealed packing 14's life has been prolonged.
The bell mouth has been seted up to the inside of scraping rubber 10, the diameter value at bell mouth top is less than the diameter value of polished rod 5, the diameter value of bell mouth bottom is the same with the internal diameter value of rubber bag 9, makes the inside of scraping rubber 10 have a restoring force, laminates the top and polished rod 5 of scraping rubber 10 inner wall, ensures that the grit on polished rod 5 surface is struck off, reduces the area of scraping rubber 10 inner wall and polished rod 5 contact simultaneously, reduces the frictional force between scraping rubber 10 and the polished rod 5, prolongs the life of scraping rubber 10, reduces and maintains the number of times, shortens the shut-in time, makes oil recovery efficiency improve, and manufacturing cost reduces.
When the device works, firstly, the polish rod 5 moves upwards under the driving of the oil pumping unit to enable the polish rod 5 to be exposed in the air, outdoor gravel is attached to the surface of the polish rod 5 under the pushing of wind, then the polish rod 5 moves downwards to enable the sand scraping rubber 10 to move relative to the polish rod 5, the gravel on the surface of the polish rod 5 is scraped, the gravel is prevented from entering between the sealing packing 14 and the polish rod 5 along with the movement of the polish rod 5, sanding is formed between the sealing packing 14 and the polish rod 5, the problem of acceleration of the abrasion speed of the sealing packing 14 is solved, the service life of the sealing packing 14 is prolonged, the frequency of replacing the sealing packing 14 is reduced, the well stopping time is shortened, the oil extraction efficiency is improved, the production cost is reduced, then the scraped gravel slides down to the oil storage tank along the surface of the sand scraping rubber 10, lubricating oil in the oil storage tank overflows to the inside of the oil isolating pipe 7, and the lubricating oil flows into the inside of the box body 1 along the gaps between the polish rod 5 and the gland Inside the sealing packing 14, the lubricating oil of the inside disappearance of the sealing packing 14 is supplemented, the lubricating oil disappearance in the sealing packing 14 is avoided serious, the dry grinding is formed between the sealing packing 14 and the polished rod 5, the problem of the accelerated abrasion speed of the sealing packing 14 is caused, and the service life of the sealing packing 14 is prolonged.
After the sealing packing 14 is worn and torn by using for a period of time, crude oil emerges through the gap between the sealing packing 14 and the polish rod 5, enters the inside of the oil separating pipe 7 through the gaps between the polish rod 5 and the pressing sleeve 2 and between the polish rod 5 and the pressing cover 3, an upward buoyancy is provided for the rubber bag 9, the rubber bag 9 pushes the sand scraping rubber 10 to move upwards, the top of the sand scraping rubber 10 enters the gap between the polish rod 5 and the cover plate 4 and seals the gap between the polish rod 5 and the cover plate 4, crude oil leakage is avoided, and meanwhile, enough maintenance time is strived for maintenance personnel.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (4)
1. The utility model provides a packing box for beam-pumping unit well head, includes box body (1), its characterized in that: the sand scraping box is characterized in that a pressing sleeve (2) is arranged at the top of an inner cavity of the box body (1), a pressing cover (3) is arranged at the top of the box body (1), a cover plate (4) is arranged at the top of the pressing cover (3), a polished rod (5) is arranged at the top of the cover plate (4), the bottom end of the polished rod (5) sequentially penetrates through the cover plate (4), the pressing cover (3), the pressing sleeve (2) and the box body (1), a storage cavity (6) is formed in the pressing cover (3), an oil separating pipe (7) is sleeved on the outer portion of the polished rod (5), the bottom end of the oil separating pipe (7) is connected with the bottom surface of the storage cavity (6), a rubber bag (9) is sleeved on the outer portion of the polished rod (5), sand scraping rubber (10) is arranged at the top of the rubber bag (9), mounting handles (11) are arranged on the left side surface and the right, an O-shaped sealing ring (13) is arranged inside the sealing groove (12), a sealing packing (14) positioned inside the box body (1) is wound outside the polish rod (5), and a gasket (15) is arranged on the bottom surface of the inner cavity of the box body (1);
the cover plate (4) is fixedly connected with the gland (3) through bolts;
an oil storage tank is formed between the inner wall of the storage cavity (6) and the outer wall of the oil separation pipe (7);
the bottom surface of storage chamber (6) is equipped with and is located the cotton piece of annular (8) inside oil separating pipe (7), cotton piece of annular (8) and polished rod (5) activity cup joint.
2. The packing box for the wellhead of the pumping unit according to claim 1, characterized in that: the inner diameter value of the oil separating pipe (7) is larger than the outer diameter value of the rubber bag (9).
3. The packing box for the wellhead of the pumping unit according to claim 1, characterized in that: the shape of the scraping rubber (10) is conical, and the diameter value of the bottom surface of the scraping rubber (10) is larger than the outer diameter value of the oil separating pipe (7).
4. The packing box for the wellhead of the pumping unit according to claim 1, characterized in that: the inside of scraping sand rubber (10) has seted up the bell mouth, the diameter value at bell mouth top is less than the diameter value of polished rod (5), the diameter value of bell mouth bottom is the same with the internal diameter value of rubber bag (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811522992.9A CN109441392B (en) | 2018-12-13 | 2018-12-13 | Packing box for wellhead of oil pumping unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811522992.9A CN109441392B (en) | 2018-12-13 | 2018-12-13 | Packing box for wellhead of oil pumping unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109441392A CN109441392A (en) | 2019-03-08 |
| CN109441392B true CN109441392B (en) | 2020-10-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811522992.9A Active CN109441392B (en) | 2018-12-13 | 2018-12-13 | Packing box for wellhead of oil pumping unit |
Country Status (1)
| Country | Link |
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| CN (1) | CN109441392B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112502657B (en) * | 2020-11-16 | 2022-07-05 | 中国石油天然气股份有限公司 | Packing box, production tree equipment and oil production system |
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| CA2629278A1 (en) * | 2002-08-09 | 2004-02-09 | Oil Lift Technology, Inc. | Stuffing box for progressing cavity pump drive |
| CN202531086U (en) * | 2012-03-22 | 2012-11-14 | 中国石油天然气股份有限公司 | Lubricating type oil sucking machine well mouth polish rod sealing packing case |
| CN203879403U (en) * | 2013-09-25 | 2014-10-15 | 王小波 | Lubricating device for preventing dry grinding of polish rod of rod pumped well |
| CN106917597A (en) * | 2017-04-30 | 2017-07-04 | 张坚 | Oil-field oil pumper packing box |
| CN207960562U (en) * | 2018-02-26 | 2018-10-12 | 延长油田股份有限公司靖边采油厂 | A kind of packing box preventing eccentric wear and oil leak |
| CN108868685A (en) * | 2018-06-05 | 2018-11-23 | 大庆润欣石化科技有限公司 | The vertical well-sealing device of tuningout energy conservation |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2357123Y (en) * | 1998-08-18 | 2000-01-05 | 曾维康 | Self-sealed blow-out preventing box |
| US6394461B1 (en) * | 2000-03-17 | 2002-05-28 | Tom Henderson | Pressure compensated stuffing box for reciprocating pumping units |
| US20140182847A1 (en) * | 2012-12-31 | 2014-07-03 | Knight Information Systems, Llc | Wellhead Sealing System and Method |
| CN203822237U (en) * | 2014-05-21 | 2014-09-10 | 刘胜 | Long-acting wellhead sealing device |
| CN207879294U (en) * | 2018-01-12 | 2018-09-18 | 吉林爱科德科技有限公司 | Oil field shaft mouth sealing device |
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2018
- 2018-12-13 CN CN201811522992.9A patent/CN109441392B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2629278A1 (en) * | 2002-08-09 | 2004-02-09 | Oil Lift Technology, Inc. | Stuffing box for progressing cavity pump drive |
| CN202531086U (en) * | 2012-03-22 | 2012-11-14 | 中国石油天然气股份有限公司 | Lubricating type oil sucking machine well mouth polish rod sealing packing case |
| CN203879403U (en) * | 2013-09-25 | 2014-10-15 | 王小波 | Lubricating device for preventing dry grinding of polish rod of rod pumped well |
| CN106917597A (en) * | 2017-04-30 | 2017-07-04 | 张坚 | Oil-field oil pumper packing box |
| CN207960562U (en) * | 2018-02-26 | 2018-10-12 | 延长油田股份有限公司靖边采油厂 | A kind of packing box preventing eccentric wear and oil leak |
| CN108868685A (en) * | 2018-06-05 | 2018-11-23 | 大庆润欣石化科技有限公司 | The vertical well-sealing device of tuningout energy conservation |
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| Publication number | Publication date |
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| CN109441392A (en) | 2019-03-08 |
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Effective date of registration: 20200918 Address after: 257091 No. 52 Huizhou Road, Dongying District, Dongying City, Shandong Province Applicant after: DONGYING LIDA PETROLEUM ENGINEERING TECHNOLOGY SERVICE Co.,Ltd. Address before: 310016 No. 37, Mugang Road, Jianggan District, Hangzhou City, Zhejiang Province Applicant before: Hu Zhifa |
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