CN112878963B - Heavy oil well is with annotating agent wax deposition equipment - Google Patents
Heavy oil well is with annotating agent wax deposition equipment Download PDFInfo
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- CN112878963B CN112878963B CN202110275450.1A CN202110275450A CN112878963B CN 112878963 B CN112878963 B CN 112878963B CN 202110275450 A CN202110275450 A CN 202110275450A CN 112878963 B CN112878963 B CN 112878963B
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- external screw
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- oil well
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- 239000000295 fuel oil Substances 0.000 title claims abstract description 16
- 239000003795 chemical substances by application Substances 0.000 title claims description 8
- 230000008021 deposition Effects 0.000 title description 13
- 238000007789 sealing Methods 0.000 claims abstract description 36
- 239000003129 oil well Substances 0.000 claims abstract description 23
- 238000010438 heat treatment Methods 0.000 claims description 33
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims 3
- 239000001993 wax Substances 0.000 description 35
- 239000003921 oil Substances 0.000 description 24
- 239000003208 petroleum Substances 0.000 description 8
- 239000012188 paraffin wax Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000001556 precipitation Methods 0.000 description 6
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005086 pumping Methods 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000004018 waxing Methods 0.000 description 5
- 239000010779 crude oil Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
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- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing or limiting, e.g. eliminating, the deposition of paraffins or like substances
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
-
- 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
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
Abstract
The invention provides an agent-injecting and wax-proofing device for a heavy oil well. This novel wax equipment is prevented to viscous crude well oiling, including sealed urceolus, sealed urceolus top end face is provided with first thread groove, the supporting end plate that is provided with of first thread groove, sealed urceolus is kept away from first thread groove end and is provided with the mounting groove, be provided with the cartridge heater in the mounting groove, sealed urceolus terminal surface is close to the mounting groove position and is provided with the connection pad, the first external screw thread ring of end plate bottom end face fixedly connected with, the end plate is located first external screw thread ring terminal surface and runs through and is provided with first through-hole, the end plate terminal surface is located the first external screw thread ring outside and evenly is provided with a plurality of first connecting holes. The invention forms the body of the thick oil well by connecting a plurality of connecting discs and a plurality of sealing outer cylinders, and the top and the bottom of the thick oil well are connected with the end discs, so that the thick oil well is integral.
Description
Technical Field
The invention relates to the technical field of wax deposition prevention equipment for thick oil wells, in particular to an agent injection wax deposition prevention equipment for thick oil wells.
Background
The wax precipitation of oil well includes two processes, that is, the wax is separated from the oil and then is gathered and adhered to the wall of the oil pipe. The wax originally dissolved in petroleum is condensed out in the process of exploitation because the dissolving capacity of petroleum to the wax is reduced. The dissolving power of a certain amount of petroleum is also certain when the composition, temperature and pressure of the petroleum are not changed, and a certain amount of paraffin can be dissolved. When the oil composition, temperature and pressure change and the dissolving power is reduced, a part of wax is separated out from the oil. We next studied petroleum.
Composition of petroleum
Under the same temperature condition, the wax dissolving power of the light oil is larger than that of the heavy oil, the more light fraction contained in the crude oil, the lower the crystallization temperature of the wax, namely the wax is not separated out, and the more the wax is kept in a dissolved state. The amount of wax dissolved by any one of the petroleum oils decreases with decreasing temperature. Therefore, at high temperatures, the amount of dissolved wax is partly condensed out as the temperature drops. Under the same wax content, the wax crystallization temperature of heavy oil is higher than that of light oil, so that petroleum with less light components is obtained and wax is easy to condense out.
Mechanical impurities in crude oil
Tiny sand grains and mechanical impurities in the oil become crystal cores precipitated by the paraffin, so that wax crystals are easy to coalesce and grow up, and the wax precipitation process is accelerated. When the water content in the oil is increased, the heat capacity of water is greater than that of the oil, so that the temperature reduction of the liquid flow can be reduced, and in addition, due to the increase of the water content, a continuous water film is easily formed on the wall of the oil pipe, and paraffin is not easy to deposit on the pipe wall. Thus, as the water content of the well increases, the extent of wax deposition is reduced. However, wax precipitation is more serious when the water content is low, because the salt in the water is precipitated and deposited on the pipe wall, which is beneficial to the aggregation of wax crystals.
When the applicant applies the invention, through retrieval, a Chinese patent is found to disclose a 'pumping wax-proof device for a heavy oil well', the application number of which is '201810728047.8', and the patent comprises a sealing outer cylinder, a sand-proof short joint, a sealing sleeve, a sealing piston, a flowing outer cylinder, a spring mandrel, an adjusting gasket and a lower joint. The thick oil well pumping wax-proof device is connected to the lower part of the pumping pipe column, and when the liquid column in the oil pipe rises to a preset height, the thick oil well pumping wax-proof device is automatically closed, so that bottom hole liquid is prevented from continuously flowing into the pipe column, crude oil is prevented from reaching a wax precipitation point, and a pumping tool is guaranteed to be smoothly lifted and lowered in the oil pipe.
The oil layer permeability is reduced due to the high wax content of the crude oil. In oil and gas exploitation, wax is separated and precipitated from oil, and continuous wax precipitation causes blockage of an oil production layer, reduction of oil well yield and even production stoppage, and brings troubles to production. The wax deposition of the oil well is one of the outstanding problems affecting the high and stable yield of the oil well, and the problem of the oil and gas production is urgently needed to be solved by seeking a more reasonable method. Therefore, the device for injecting the agent and preventing the wax for the thick oil well is provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides the wax deposition prevention device for the injection agent for the thick oil well, which solves the problem of wax deposition in the thick oil well.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme:
the utility model provides a thickened oil well is with annotating agent and preventing waxing equipment, includes sealed urceolus, sealed urceolus top end face is provided with first thread groove, the supporting end disc that is provided with of first thread groove, sealed urceolus is kept away from first thread groove end and is provided with the mounting groove, be provided with the cartridge heater in the mounting groove, sealed urceolus terminal surface is close to the mounting groove position and is provided with the connection pad.
Preferably, the end disc bottom end face is fixedly connected with a first external thread ring, the end disc is located the first external thread ring end face and penetrates through and is provided with a first through hole, the end disc end face is located the first external thread ring outer side and is evenly provided with a plurality of first connecting holes, the first external thread ring is matched with the first thread groove in position, and the first external thread ring is in threaded connection with the first thread groove.
Preferably, the bottom end face of the connecting plate is fixedly connected with a second external thread ring, the top end face of the connecting plate is fixedly connected with a third external thread ring, the third external thread ring is identical to the second external thread ring in outer diameter, the connecting plate is located on the end face of the second external thread ring and penetrates through a second through hole, a plurality of second connecting holes are uniformly formed in the position, located on the outer side of the second external thread ring, of the connecting plate end face, the third external thread ring is matched with the mounting groove in position, and the third external thread ring is in threaded connection with the mounting groove.
Preferably, the heating cylinder terminal surface evenly is provided with a plurality of mounting holes, and the mounting hole is embedded setting, the supporting heating pipe that is provided with in mounting hole position, heating pipe and mounting hole sliding connection, the solid fixed ring of heating pipe terminal surface is connected with the connecting piece, the connecting piece is embedded setting with the heating cylinder.
Preferably, the heating cylinder inner side wall is uniformly and fixedly connected with a plurality of connecting columns, the connecting columns penetrate through the sealing outer cylinder, and the connecting columns are far away from the heating cylinder end and are fixedly connected with the sealing inner cylinder.
Preferably, the sealing inner cylinder is made of 38CrMoAl round steel, and the inner wall of the sealing inner cylinder is smooth.
The working principle is as follows: the device is characterized in that the device is connected through a plurality of connecting discs and a plurality of sealing outer cylinders to form a thick oil well main body, the top and the bottom of the thick oil well are connected with end discs to form a thick oil well whole body, the sealing inner cylinder is made of 38CrMoAl round steel, the inner wall of the sealing inner cylinder is smooth, the wax deposition of the sealing inner cylinder is reduced, the heating is carried out through an internal heating pipe, heat energy is transferred to the sealing inner cylinder, the wax deposition phenomenon of the sealing inner cylinder caused by low temperature is prevented, a gap is formed between the sealing outer cylinder and the sealing inner cylinder and used for injecting water resource, the heat capacity of water is larger than that of oil, the reduction of liquid flow temperature can be reduced, in addition, due to the increase of water content, a continuous water film is easily formed on the wall of an oil pipe, paraffin cannot be deposited on the pipe wall, and the wax deposition degree is reduced; if more serious wax deposition occurs, hot water is injected for heating treatment, so that the production stop of an oil well is prevented.
(III) advantageous effects
The invention provides an agent-injecting and wax-proofing device for a heavy oil well. The method has the following beneficial effects:
1. the invention provides an injection anti-waxing device for a heavy oil well, which is characterized in that a plurality of connecting discs and a plurality of sealing outer cylinders are connected to form a heavy oil well main body, the top and the bottom of the heavy oil well are connected with end discs to form a whole heavy oil well, the structure is simple, the sealing inner cylinder is made of 38CrMoAl round steel, the inner wall is smooth, and the waxing of the sealing inner cylinder is reduced.
2. The invention provides an agent injection wax-proofing device for a heavy oil well, which is provided with a heating cylinder, wherein the heating cylinder is used for heating through an internal heating pipe and transferring heat energy to a sealing inner cylinder, so that the wax-proofing device can prevent the wax-proofing phenomenon of the sealing inner cylinder caused by low temperature.
3. The invention provides an agent-injecting and paraffin-preventing device for a heavy oil well, wherein a gap is arranged between a sealing outer cylinder and a sealing inner cylinder and used for injecting water resources, the heat capacity of water is greater than that of oil, the reduction of the liquid flow temperature can be reduced, and in addition, due to the increase of the water content, a continuous water film is easily formed on the wall of an oil pipe, so that paraffin cannot be deposited on the pipe wall, and the paraffin-preventing degree is reduced.
Drawings
FIG. 1 is a schematic structural diagram of an agent-injecting and wax-proofing device for a heavy oil well, provided by the invention;
FIG. 2 is a schematic structural view of the end disk of FIG. 1;
FIG. 3 is a schematic three-dimensional structure of FIG. 2;
FIG. 4 is a schematic structural diagram of the connecting disc in FIG. 1;
FIG. 5 is a schematic three-dimensional structure of FIG. 4;
FIG. 6 is a schematic structural view of the heat block of FIG. 1;
FIG. 7 is a front view of FIG. 6;
FIG. 8 is a schematic structural diagram of the heating pipe in FIG. 1;
fig. 9 is a schematic structural view of the connector.
Wherein, 1, the outer cylinder is sealed; 11. a first thread groove; 12. mounting grooves; 2. an end disc; 21. a first externally threaded ring; 22. a first connection hole; 3. a connecting disc; 31. a second externally threaded ring; 32. a third externally threaded ring; 33. a second connection hole; 4. a heating cylinder; 41. mounting holes; 42. heating a tube; 43. a connecting member; 44. connecting columns; 45. and sealing the inner cylinder.
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.
The first embodiment is as follows:
as shown in fig. 1 to 9, an embodiment of the present invention provides an agent-injection wax-proofing device for a heavy oil well, including a sealing outer cylinder 1, and characterized in that: the end face of the top of the sealed outer cylinder 1 is provided with a first thread groove 11, the end disc 2 is arranged on the first thread groove 11 in a matched mode, the end, away from the first thread groove 11, of the sealed outer cylinder 1 is provided with a mounting groove 12, a heating cylinder 4 is arranged in the mounting groove 12, and the end face of the sealed outer cylinder 1 is provided with a connecting disc 3 close to the mounting groove 12.
The end face of the bottom of the connecting disc 3 is fixedly connected with a second external thread ring 31, the end face of the top of the connecting disc 3 is fixedly connected with a third external thread ring 32, the third external thread ring 32 is the same as the external diameter of the second external thread ring 31, the connecting disc 3 is located on the end face of the second external thread ring 31 and is provided with a second through hole in a penetrating mode, the end face of the connecting disc 3 is located on the outer side of the second external thread ring 31 and is evenly provided with a plurality of second connecting holes 33, the third external thread ring 32 is matched with the position of the mounting groove 12, and the third external thread ring 32 is in threaded connection with the mounting groove 12.
The end face of the heating cylinder 4 is uniformly provided with a plurality of mounting holes 41, the mounting holes 41 are arranged in an embedded manner, the mounting holes 41 are provided with heating pipes 42 in a matched manner, the heating pipes 42 are slidably connected with the mounting holes 41, a fixing ring on the end face of the heating pipes 42 is connected with a connecting piece 43, and the connecting piece 43 and the heating cylinder 4 are arranged in an embedded manner.
The sealing inner cylinder 45 is made of 38CrMoAl round steel, and the inner wall of the sealing inner cylinder is smooth.
Connect through a plurality of connection pads 3 and a plurality of sealed urceolus 1, form the viscous crude well main part, and be connected with end plate 2 at viscous crude well top and bottom, it forms the viscous crude well wholly, its simple structure, sealed inner tube 45 adopts 38CrMoAl round steel, the inner wall is smooth, reduce sealed inner tube 45 waxing phenomenon, be provided with cartridge heater 4 in the mounting groove 12 in sealed urceolus 1 simultaneously, heat through the inside heating pipe 42 of cartridge heater 4, and give sealed inner tube 45 with heat energy transfer, the preventing means causes the waxing phenomenon that sealed inner tube 45 appears because of low temperature.
Example two:
a plurality of connecting columns 44 are uniformly and fixedly connected to the inner side wall of the heating cylinder 4, the connecting columns 44 penetrate through the sealing outer cylinder 1, and the sealing inner cylinder 45 is fixedly connected to the connecting columns 44 far away from the heating cylinder 4; a gap is arranged between the sealing outer cylinder 1 and the sealing inner cylinder 45 and is used for injecting water resources, the heat capacity of water is greater than that of oil, the reduction of the liquid flow temperature can be reduced, and in addition, due to the increase of the water content, a continuous water film is easily formed on the wall of an oil pipe, so that paraffin cannot be deposited on the pipe wall, and the paraffin precipitation degree is reduced to a certain extent; if more serious wax deposition occurs, hot water is injected for heating treatment, so that the production stop of an oil well is prevented.
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 heavy oil well is with annotating agent and preventing wax bonding equipment, includes sealed urceolus (1), its characterized in that: a first thread groove (11) is formed in the end face of the top of the sealing outer cylinder (1), an end disc (2) is arranged on the first thread groove (11) in a matched mode, an installation groove (12) is formed in the end, far away from the first thread groove (11), of the sealing outer cylinder (1), a heating cylinder (4) is arranged in the installation groove (12), and a connecting disc (3) is arranged on the end face of the sealing outer cylinder (1) close to the installation groove (12);
the end face of the heating cylinder (4) is uniformly provided with a plurality of mounting holes (41), the mounting holes (41) are arranged in an embedded mode, the mounting holes (41) are provided with heating pipes (42) in a matched mode, the heating pipes (42) are connected with the mounting holes (41) in a sliding mode, the end face of each heating pipe (42) is fixedly connected with a connecting piece (43), and the connecting pieces (43) and the heating cylinder (4) are arranged in an embedded mode;
the even fixedly connected with of cartridge heater (4) inside wall a plurality of spliced poles (44), and a plurality of spliced poles (44) all run through sealed urceolus (1), and are a plurality of cartridge heater (4) end fixedly connected with seals inner tube (45) is kept away from in spliced pole (44), is provided with the clearance between sealed urceolus (1) and the sealed inner tube (45) for pour into the water resource.
2. The agent-injecting and wax-proofing equipment for the thick oil well is characterized in that: end disc (2) bottom terminal surface fixedly connected with first external screw thread ring (21), end disc (2) are located first external screw thread ring (21) terminal surface and run through and are provided with first through-hole, end disc (2) terminal surface is located first external screw thread ring (21) outside and evenly is provided with a plurality of first connecting holes (22), first external screw thread ring (21) and first thread groove (11) position cooperate, and first external screw thread ring (21) and first thread groove (11) threaded connection.
3. The agent-injecting wax-proofing equipment for the thick oil well, according to claim 1, is characterized in that: connection pad (3) bottom terminal surface fixedly connected with second external screw thread ring (31), connection pad (3) top terminal surface fixedly connected with third external screw thread ring (32), third external screw thread ring (32) are the same with second external screw thread ring (31) external diameter, connection pad (3) are located second external screw thread ring (31) terminal surface and run through and are provided with the second through-hole, connection pad (3) terminal surface is located second external screw thread ring (31) outside and evenly is provided with a plurality of second connecting holes (33), third external screw thread ring (32) cooperate with mounting groove (12) position, and third external screw thread ring (32) and mounting groove (12) threaded connection.
4. The agent-injecting wax-proofing equipment for the thick oil well, according to claim 1, is characterized in that: the sealing inner cylinder (45) is made of 38CrMoAl round steel, and the inner wall of the sealing inner cylinder is smooth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110275450.1A CN112878963B (en) | 2021-03-15 | 2021-03-15 | Heavy oil well is with annotating agent wax deposition equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110275450.1A CN112878963B (en) | 2021-03-15 | 2021-03-15 | Heavy oil well is with annotating agent wax deposition equipment |
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| Publication Number | Publication Date |
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| CN112878963A CN112878963A (en) | 2021-06-01 |
| CN112878963B true CN112878963B (en) | 2023-03-31 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108643872A (en) * | 2018-07-05 | 2018-10-12 | 江苏航天鸿鹏数控机械有限公司 | A kind of heavy oil wells pumping wax-proofing apparatus |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2697313Y (en) * | 2004-04-24 | 2005-05-04 | 林本立 | Wax and oil scraper for borehole pipe |
| CN201209429Y (en) * | 2008-04-18 | 2009-03-18 | 耿涛 | Wax removing and preventing device for electrical heated oil conduit |
| CN202187747U (en) * | 2011-08-04 | 2012-04-11 | 中国石油天然气股份有限公司 | Tubular magnetic wax-proof viscosity-reducing device for oil well |
| CN202578543U (en) * | 2012-06-08 | 2012-12-05 | 山东创佳石油机械制造有限公司 | Vacuum thermal insulation circulating pipe |
| CN203742553U (en) * | 2014-04-02 | 2014-07-30 | 大庆市华禹石油机械制造有限公司 | Oil well paraffin prevention and viscosity reduction device |
| CN208996696U (en) * | 2018-11-12 | 2019-06-18 | 西安石油大学 | A kind of Paraffin Removal device |
| CN209339925U (en) * | 2019-01-23 | 2019-09-03 | 石海鸿 | A kind of heating device with anti-oil well tubing wax |
| CN110617031A (en) * | 2019-10-17 | 2019-12-27 | 大庆天工开物能源科技有限公司 | Shaft wax-proof sand-proof tubular column for oil extraction in oil field |
| CN111119750B (en) * | 2020-02-25 | 2022-03-15 | 刘世江 | Wax removal and prevention oil pipe unit, wax removal and prevention oil pipe and preparation method of wax removal and prevention oil pipe unit |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108643872A (en) * | 2018-07-05 | 2018-10-12 | 江苏航天鸿鹏数控机械有限公司 | A kind of heavy oil wells pumping wax-proofing apparatus |
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