CN107524431A - The conveying device for the material that mobility varies with temperature - Google Patents
The conveying device for the material that mobility varies with temperature Download PDFInfo
- Publication number
- CN107524431A CN107524431A CN201710624898.3A CN201710624898A CN107524431A CN 107524431 A CN107524431 A CN 107524431A CN 201710624898 A CN201710624898 A CN 201710624898A CN 107524431 A CN107524431 A CN 107524431A
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- Prior art keywords
- inner sleeve
- outer tube
- sleeve
- temperature
- electric
- Prior art date
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- 239000000463 material Substances 0.000 title claims abstract description 49
- 239000004020 conductor Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 238000009413 insulation Methods 0.000 claims description 14
- 230000006978 adaptation Effects 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 239000003921 oil Substances 0.000 description 16
- 238000000605 extraction Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 10
- 239000010779 crude oil Substances 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 6
- 230000007812 deficiency Effects 0.000 description 4
- 230000008023 solidification Effects 0.000 description 4
- 238000007711 solidification Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000008014 freezing Effects 0.000 description 2
- 238000007710 freezing Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 208000005168 Intussusception Diseases 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000010792 warming Methods 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
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
-
- 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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)
- Resistance Heating (AREA)
Abstract
The conveying device of the material varied with temperature the invention discloses mobility, including power-supply system, inner-outer sleeve jointed tubular workpieces group and electric-conductor；The inner-outer sleeve jointed tubular workpieces group includes inner sleeve and the outer tube being socketed in outside inner sleeve, the inner sleeve and outer tube are made up of energy conductive material, the electric-conductor electricity connects the inner sleeve first end and outer tube first end positioned at the same side, inner sleeve and outer tube electricity are connect by electric-conductor, electricity connects the end of inner sleeve second and the end of outer tube second respectively at the power-supply system the two poles of the earth, make current direction outer tube, electric-conductor and inner sleeve, the inner-outer sleeve jointed tubular workpieces group heating power and heated material are with the mobility of improving material.It has the following advantages that：The electric current of power-supply system can flow to outer tube, electric-conductor and inner sleeve, and simultaneously heated material is with the mobility of improving material for inner-outer sleeve jointed tubular workpieces group heating power, to reduce material and cover the viscosity between tube wall, so that material conveys.
Description
Technical field
The present invention relates to a kind of conveying device of material, more particularly to the conveying of material that a kind of mobility varies with temperature
Device.
Background technology
The extraction extraction or conveying of the conveying for the material that mobility varies with temperature, such as crude oil, because material fluidity is poor,
Viscosity is larger, causes the difficulty in extraction extraction or course of conveying big, illustrates below by taking the extraction extraction or conveying of crude oil as an example
It is insufficient existing for background technology.
Oil field can meet viscous crude plot (viscous crude is the precious resources in crude oil because density is big) in recovery process, thick
The physicochemical properties of oil determine that its extraction and transport have extreme difficulty.For example, NORTHWEST CHINA area just has what is enriched
Viscous crude resource, the freezing point of viscous crude are generally 42 degree or so, i.e., play solidification in 2000 meters of stratum depth, after solidification viscous crude and tube wall it
Between can form big cohesive force, therefore be difficult to from stratum extract and produce, in order to extract the viscous crude from stratum, in its recovery process
In, typically produce and extract using following three kinds of traditional handicrafts.
Traditional handicraft one is：Thin oil (light oil through refining) dilution method.This method be the light oil that will refine or
Light crude oil injects stratum using well casing from ground and dissolves each other and dilute with the viscous crude in stratum, according to the denseness of stratum viscous crude,
The injection rate of the light oil of dilution is at 2-6 times.This method there are following deficiency：1st, the fortune of ground light oil is increased
Defeated cost；2nd, the cost that miscella is extracted from more than 2000 meters depth of stratums is improved；3rd, the damage for causing the stratum of thin oil to permeate
Consumption wastes.
Traditional handicraft two is：Water vapour stratum heating method.This method is to utilize power plant's heat in surface construction big power station
A large amount of high-temperature steams can be produced, and the high-temperature steam is separately bored into vertical shaft and is forced through viscous crude wellblock, make the viscous crude wellblock
The stratum of 2000 meters of deep left and right is maintained at 50 degree or so, viscous crude is not cooled down and is solidified by decompression, and extraction ground is extracted to reach
Purpose.This method there are following deficiency：1st, invest huge；2nd, because local warming's system is extremely complex, therefore can largely waste
Energy, increase investment；If the 3rd, directly using the bore for the well head well casing that expansion drilling well certainly will be needed to oil pipe heating, and in depth
Drilling cost caused by expanding well casing bore in well drilling well will be huger；4th, former water content in oil is caused to increase, so as to increase
Produce cost and water-oil separating cost.
Traditional handicraft three is：Directly stratum is heated to tap in advance with electric heating or steam heat below 2000 meters, meter
The loss heat energy that the heating viscous crude is drawn into ground in 2000 meters of depth extraction has been calculated, viscous crude is extracted to ground before solidification
Face.This method there are following deficiency：1st, amount of investment is big；2nd, technical difficulty is high, it is difficult to commercial application.
The content of the invention
A kind of conveying device of the material varied with temperature the invention provides mobility, which overcomes in background technology and flows
The deficiency present in material conveying that dynamic property varies with temperature.
The present invention solve its technical problem used technical scheme be：
The conveying device for the material that mobility varies with temperature, including power-supply system (10), inner-outer sleeve jointed tubular workpieces group and lead
Electric part (40)；The inner-outer sleeve jointed tubular workpieces group includes inner sleeve (20) and is socketed in the outer tube (30) of inner sleeve (20) outside, and this is interior
Sleeve pipe (20) and outer tube (30) by can conductive material be made, the electric-conductor (40) electricity connects the inner sleeve (20) the positioned at the same side
One end and outer tube (30) first end, connect inner sleeve (20) and outer tube (30) electricity by electric-conductor (40), the power-supply system
(10) electricity connects the end of inner sleeve (20) second and the end of outer tube (30) second respectively at the two poles of the earth, makes current direction outer tube (30), conduction
Part (40) and inner sleeve (20), the inner-outer sleeve jointed tubular workpieces group heating power and heated material are with the mobility of improving material.
Among one embodiment：The electric-conductor (40) is conduction collar, and the conduction collar is socketed in inner sleeve (20) first end
Between outer tube (30) first end.
Among one embodiment：Also include the insulation collar (50), the insulation collar (50) is at least adapted to and is socketed in inner sleeve
Between (20) second ends and the end of outer tube (30) second.
Among one embodiment：The insulation collar (50) number is multiple, and the plurality of insulation collar (50) interval is located inside and outside
It is socketed in pipe fitting group, and adaptation is socketed between inner sleeve (20) and outer tube (30).
Among one embodiment：Gap is left between the inner sleeve (20) and outer tube (30).
Among one embodiment：Inner sleeve (20) area of section is less than outer tube (30) area of section.
Among one embodiment：The pipe wall thickness of the inner sleeve (20) is less than the pipe wall thickness of outer tube (30).
Among one embodiment：The insulation collar (50), which is adopted, to be made of resin.
Among one embodiment：The inner sleeve (20) is used to convey material, at least inner sleeve in the inner-outer sleeve jointed tubular workpieces group
(20) heating power and heated material are with the mobility of improving material.
Compared with background technology, it has the following advantages that the technical program：
The electric current of power-supply system can flow to outer tube, electric-conductor and inner sleeve, and inner-outer sleeve jointed tubular workpieces group heating power simultaneously adds
Thermal material is with the mobility of improving material, to reduce material and cover the viscosity between tube wall, so that material conveys.
Electric-conductor is conduction collar, and conduction collar is socketed between inner sleeve first end and outer tube first end, it is ensured that two
Person's electricity connects, easy to assembly, and cost is low.
Inner sleeve area of section is less than outer tube area of section, inner sleeve resistance value is more than outer tube resistance value, inner sleeve
Pipe heating amount is more than outer tube heating amount, reduces energy consumption, improves energy utilization rate, improves the efficiency of heating surface.
Brief description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the structural representation of the conveying device of the present invention.
Embodiment
It refer to Fig. 1, the conveying device for the material that mobility varies with temperature, including power-supply system 10, inside and outside socket pipe
Part group and electric-conductor 40.The inner-outer sleeve jointed tubular workpieces group includes an inner sleeve 20 and one for being used to convey material and is socketed in inner sleeve 20
Outer outer tube 30, the inner sleeve 20 and outer tube 30 by can conductive material be made, such as ironware or steel part or other metal materials,
The shape of the internal and external casing is indefinite, can circular tube, can tube bundle with square section, can straight tube, flexible tube etc..The electricity of electric-conductor 40
The first end of inner sleeve 20 and the first end of outer tube 30 positioned at the same side are connect, inner sleeve 20 and outer tube 30 are made by electric-conductor 40
Electricity connects, i.e. among the present embodiment, direct conduction does not connect the inner sleeve 20 with outer tube 30, such as inner sleeve 20 and outer tube
Gap is left between 30, and, also only connect by the electricity of electric-conductor 40.Electricity connects the end of inner sleeve 20 second respectively at the two poles of the earth of power-supply system 10
With the end of outer tube 30 second, power-supply system 10, outer tube 30, electric-conductor 40 and inner sleeve 20 is set to form the circuit of a closed loop,
Allow current to flow outer tube 30, electric-conductor 40 and inner sleeve 20, the outer tube 30, the heating power of inner sleeve 20 and heated material with
The mobility of improving material, especially by the heated material of inner sleeve 20 contact or close on the part of inner sleeve 20, the part
Low-viscosity layer can be referred to as, low-viscosity layer mobility gets a promotion, and (low-viscosity layer can drive it to wrap up in the other parts surrounded
Flow together, wrapped up in band other parts it is internally positioned therefore even if can equally be wrapped up in also in denseness high state band conveying, no
The conveying of material can be influenceed).
Among the present embodiment：The electric-conductor 40 is conduction collar, and the conduction collar is socketed in the first end of inner sleeve 20 and outer
Between the first end of sleeve pipe 30, the first end of inner sleeve 20 and the first end of outer tube 30 are connect with electricity.
Among the present embodiment：Also include the insulation collar 50,50 numbers of the insulation collar are multiple, the plurality of insulation collar 50
Interval is located in inner-outer sleeve jointed tubular workpieces group, and adaptation is socketed between inner sleeve 20 and outer tube 30, moreover, at least one is
Adaptation is socketed between the end of inner sleeve 20 second and the end of outer tube 30 second.The insulation collar 50 has high-strength corrosion-resisting special
Property, its material such as resin material.
Among the present embodiment：The area of section of inner sleeve 20 is less than the area of section of outer tube 30, e.g., the pipe of the inner sleeve 20
Wall wall thickness is less than the pipe wall thickness of outer tube 30.Because the area of section of inner sleeve 20 is less than the area of section of outer tube 30, then inner sleeve
The resistance value of pipe 20 is more than the resistance value of outer tube 30, the caloric value of inner sleeve 20 is more than the caloric value of outer tube 30, reduces energy consumption, improves
Energy utilization rate.
Among the present embodiment：The power-supply system 10 is connect as included power supply and regulation circuit, the power supply by adjusting circuit electricity
Inner-outer sleeve jointed tubular workpieces group, then it can be adjusted by adjusting circuit and flow through the parameters such as curtage at inner-outer sleeve jointed tubular workpieces group
Value.As needed, it may also include short-circuit protection.As needed, the power supply can be dc generator or ac rectifying power source.
As needed, the power delivery circuit and electric control gear that the electric current is transported to inner-outer sleeve jointed tubular workpieces group be may also include.
Illustrated below exemplified by applying and being recovered the oil below 2000 meters：The power-supply system 10 be located at ground (or pipeline fortune
Defeated base station)；The outer tube 30 is a support oil-well wall to prevent the outer shield steel sleeve to cave in；The inner sleeve 20 is one
The interior steel sleeve of oil plant can be extracted from stratum；The parallel intussusception arrangement of the internal and external casing, and go deep into stratum always more than 2000 meters.
The insulation collar 50 and electric-conductor 40 are used to ensure that the current lead-through point of internal and external casing to be electric-conductor 40, in addition to firing point not
Conducting.The conducting ring sectional area of the electric-conductor 40 is more than or equal to outer tube sectional area, to ensure conduction.Using original crude oil
The purpose extracted by the i.e. achievable viscous crude of a small amount of transformation is only needed in the case of mining system；Certainly, if the oil of stepout well
Well, so that it may by the bore of Precise spraying internal and external casing and the material of tubing with Precise spraying and the resistance of configuration inner tubal wall
To reach the purpose of control and regulation inner tube wall temperature.
The present invention can produce the principle of heat energy using electric current by pipe fitting, i.e. produce heat energy using the resistance of pipe fitting
Method, pass through current strength control come reach tube wall generate heat to the temperature needed for technique, to reduce between viscous crude and tube wall
Viscosity, so that the purpose with pipeline is extracted in extraction.The present invention, by pipe fitting, makes pipe fitting tube wall keep a perseverance using electric current
Constant temperature degree, making to be formed a low-viscosity layer between viscous crude and tube wall, (periphery of conveying material forms low-viscosity layer, and inside can retain viscous crude
State) method, to realize that viscous crude is extracted out ground easily from more than 2000 meters of stratum depth, and similar to well casing using pipeline
Principle and method reach purpose in ground pipeline.The present invention can form overburden using electric current by pipe fitting to be caused
The principle of electric conductor heating, ingenious different from the caliber of inner sleeve with reference to oil well outer tube and the tube section product moment of formation excessively stream
The degree of heat is poor, to realize the purpose of the controllable heating of pumping well pipe tube wall.China and foreign countries' bushing temperature of the present invention is far below inner sleeve temperature
Degree only makes tube wall reach the temperature of technological requirement without wasting electric energy, makes between the gap that viscous crude contacts with inner sleeve tube wall
Thick viscosity forms low-friction coefficient layer in other words because temperature does not reach freezing point, and viscous crude is in the gap contacted with inner sleeve tube wall
Between will not produce cohesive force more than light oil, and make viscous crude (viscous crude be also to maintain thick knot solidification outside from well casing tube wall gap
State) ground (can be extracted, or, smooth because of the viscosity reduction desaturation in tube wall and the gap of viscous crude block by smooth export in well casing
Flowing).Heating tube wall of the present invention is not to need whole viscous crude in heating tube, but tube wall is kept certain temperature,
The temperature only makes to form a minimum gap (low-viscosity layer) between tube wall and viscous crude, and the gap spacing is to keep viscous crude smooth
Ground movement in shop is limited, therefore present invention, avoiding unnecessarily going to heat all crude oil viscous crude that need to be produced, a large amount of energy can be saved
Amount consumption, is accurate mode of heating.The present invention is without addition and transforms existing well casing and other facilities too much, you can transformation makes
With, and energy consumption is low, science simple to operate, is a kind of advanced technology with high social and economic significance.It is of the invention special
The technology of profit can be widely applied to crude oil, viscous crude oil field exploitation and conveying, it can also be used to the high original such as pitch one kind denseness
The pipeline of oil product.
It is described above, only present pre-ferred embodiments, therefore the scope that the present invention is implemented can not be limited according to this, i.e., according to
The equivalent changes and modifications that the scope of the claims of the present invention and description are made, all should still it belong in the range of the present invention covers.
Claims (9)
1. the conveying device for the material that mobility varies with temperature, it is characterised in that：Including power-supply system (10), inside and outside socket pipe
Part group and electric-conductor (40)；The inner-outer sleeve jointed tubular workpieces group includes inner sleeve (20) and is socketed in the outer tube of inner sleeve (20) outside
(30), the inner sleeve (20) and outer tube (30) are made up of energy conductive material, and the electric-conductor (40) electricity is connect in the same side
Sleeve pipe (20) first end and outer tube (30) first end, connect inner sleeve (20) and outer tube (30) electricity by electric-conductor (40),
Electricity connects the end of inner sleeve (20) second and the end of outer tube (30) second respectively at power-supply system (10) the two poles of the earth, makes current direction outer tube
(30), electric-conductor (40) and inner sleeve (20), the inner-outer sleeve jointed tubular workpieces group heating power and heated material are with the stream of improving material
Dynamic property.
2. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The electric-conductor
(40) it is conduction collar, the conduction collar is socketed between inner sleeve (20) first end and outer tube (30) first end.
3. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：Also include exhausted
The edge collar (50), the insulation collar (50) be at least adapted to be socketed in the end of inner sleeve (20) second and the end of outer tube (30) second it
Between.
4. the conveying device for the material that mobility according to claim 3 varies with temperature, it is characterised in that：The insulation sleeve
Ring (50) number is multiple, and the plurality of insulation collar (50) interval is located in inner-outer sleeve jointed tubular workpieces group, and adaptation is socketed in inner sleeve
Manage between (20) and outer tube (30).
5. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The inner sleeve
(20) gap is left between outer tube (30).
6. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The inner sleeve
(20) area of section is less than outer tube (30) area of section.
7. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The inner sleeve
(20) pipe wall thickness is less than the pipe wall thickness of outer tube (30).
8. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The insulation sleeve
Ring (50), which is adopted, to be made of resin.
9. the conveying device for the material that mobility according to claim 1 varies with temperature, it is characterised in that：The inner sleeve
(20) it is used to convey material, at least inner sleeve (20) heating power and heated material is with improving material in the inner-outer sleeve jointed tubular workpieces group
Mobility.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624898.3A CN107524431A (en) | 2017-07-27 | 2017-07-27 | The conveying device for the material that mobility varies with temperature |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710624898.3A CN107524431A (en) | 2017-07-27 | 2017-07-27 | The conveying device for the material that mobility varies with temperature |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107524431A true CN107524431A (en) | 2017-12-29 |
Family
ID=60680240
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710624898.3A Pending CN107524431A (en) | 2017-07-27 | 2017-07-27 | The conveying device for the material that mobility varies with temperature |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107524431A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043539A (en) * | 1988-12-19 | 1990-07-04 | 河北省阜城县石油热采器厂 | The down-hole hot extractor of oil-well pump of oil well |
| CN1078015A (en) * | 1993-02-22 | 1993-11-03 | 大港石油管理局石油机械厂 | Electrically heated pumping unit |
| CN2145858Y (en) * | 1993-02-22 | 1993-11-10 | 大港石油管理局石油机械厂 | Electrothermal pumping unit |
| CN2276555Y (en) * | 1996-09-04 | 1998-03-18 | 冶金工业部鞍山热能研究院 | Bore oil-reservior frequency-modulated heater |
| US6142707A (en) * | 1996-03-26 | 2000-11-07 | Shell Oil Company | Direct electric pipeline heating |
| US20030020499A1 (en) * | 2001-07-20 | 2003-01-30 | Bass Ronald M. | Method for commissioning and operating an electrically heated pipe-in-pipe subsea pipeline |
| US20030178842A1 (en) * | 2000-08-08 | 2003-09-25 | John Gallagher | Pipe assembly |
| CN1715612A (en) * | 2004-07-04 | 2006-01-04 | 金德健 | Inner oil tube with heater of underwell oil pumping pipe |
| CN201137486Y (en) * | 2007-08-20 | 2008-10-22 | 曲景宽 | Underground cable-free electromagnetic electric heating film compound heating oil production device |
| US20130108251A1 (en) * | 2010-05-05 | 2013-05-02 | Technip France | Pipeline |
| CN207296980U (en) * | 2017-07-27 | 2018-05-01 | 方明环保科技(漳州)有限公司 | A kind of conveying device for the material that mobility varies with temperature |
-
2017
- 2017-07-27 CN CN201710624898.3A patent/CN107524431A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1043539A (en) * | 1988-12-19 | 1990-07-04 | 河北省阜城县石油热采器厂 | The down-hole hot extractor of oil-well pump of oil well |
| CN1078015A (en) * | 1993-02-22 | 1993-11-03 | 大港石油管理局石油机械厂 | Electrically heated pumping unit |
| CN2145858Y (en) * | 1993-02-22 | 1993-11-10 | 大港石油管理局石油机械厂 | Electrothermal pumping unit |
| US6142707A (en) * | 1996-03-26 | 2000-11-07 | Shell Oil Company | Direct electric pipeline heating |
| CN2276555Y (en) * | 1996-09-04 | 1998-03-18 | 冶金工业部鞍山热能研究院 | Bore oil-reservior frequency-modulated heater |
| US20030178842A1 (en) * | 2000-08-08 | 2003-09-25 | John Gallagher | Pipe assembly |
| US20030020499A1 (en) * | 2001-07-20 | 2003-01-30 | Bass Ronald M. | Method for commissioning and operating an electrically heated pipe-in-pipe subsea pipeline |
| CN1715612A (en) * | 2004-07-04 | 2006-01-04 | 金德健 | Inner oil tube with heater of underwell oil pumping pipe |
| CN201137486Y (en) * | 2007-08-20 | 2008-10-22 | 曲景宽 | Underground cable-free electromagnetic electric heating film compound heating oil production device |
| US20130108251A1 (en) * | 2010-05-05 | 2013-05-02 | Technip France | Pipeline |
| CN207296980U (en) * | 2017-07-27 | 2018-05-01 | 方明环保科技(漳州)有限公司 | A kind of conveying device for the material that mobility varies with temperature |
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