CN108505971A - A kind of downhole fluid electric heater - Google Patents
A kind of downhole fluid electric heater Download PDFInfo
- Publication number
- CN108505971A CN108505971A CN201810357458.0A CN201810357458A CN108505971A CN 108505971 A CN108505971 A CN 108505971A CN 201810357458 A CN201810357458 A CN 201810357458A CN 108505971 A CN108505971 A CN 108505971A
- Authority
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- China
- Prior art keywords
- valve body
- shell
- tapered
- central tube
- heater
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 238000010438 heat treatment Methods 0.000 claims abstract description 35
- 239000007787 solid Substances 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000000178 monomer Substances 0.000 claims description 5
- 238000010792 warming Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 10
- 229930195733 hydrocarbon Natural products 0.000 description 10
- 150000002430 hydrocarbons Chemical class 0.000 description 10
- 239000004215 Carbon black (E152) Substances 0.000 description 6
- 239000004058 oil shale Substances 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 238000010992 reflux Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003027 oil sand Substances 0.000 description 1
- 239000003079 shale oil Substances 0.000 description 1
- -1 viscous crude Substances 0.000 description 1
- 238000003911 water pollution 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/04—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones using electrical heaters
-
- 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
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)
- Details Of Valves (AREA)
Abstract
The invention discloses a kind of downhole fluid electric heaters, including shell, central tube, continuous helical deflecting plate, heating rod, eddy-current coils, insulating layer, seal closure, terminal box and check valve.The present invention utilizes eddy current effect indirectly heat fluid, and the efficiency of heating surface and the rate of heat addition of downhole fluid are improved by the way that eddy current effect and continuous helical deflecting plate heat exchange structure to be combined.Heater realizes that the secondary linkage of heater outlet seals in the operational process of underground, by changing input current, effectively downhole fluid can be avoided to be back in heater.
Description
Technical field
The present invention relates to a kind of downhole fluid electric heaters, are related to oil shale, heavy oil, viscous crude, oil-sand, gas hydrates
Equal unconventional energy resource field.
Background technology
Under current position the utilization technology of hydrocarbon resources be divided into earth's surface utilize technology and converted in-situ technology.Earth's surface utilization technology
It is the underground hydro carbons development of resources technology of current relative maturity, but there are mining cost height using technology for earth's surface；Air and underground
Water pollution is big, and water consumption is big；The shortcomings of being not suitable for the exploitation of deep hydrocarbon resources.Converted in-situ technology refers to underground hydro carbons ore bed
Situ heat treatment is carried out, underground hydrocarbon resources is made to be pyrolyzed.Converted in-situ technology, which has, does not destroy earth's surface, environmentally safe, fits
The advantages that closing the exploitation of deep hydrocarbon resources.
Converted in-situ heating means have heat transfer, thermal convection current, three kinds of heat radiation.Heat transfer heating means are by resistance heating
Device, which is placed in wellbore, directly heats destination layer, as United States Patent (USP) US2548360 describes a kind of electricity being placed in wellbore viscous oil
Viscous oil is heated and is diluted by heating element, the heating element, so that the viscosity of oil is reduced, to be pumped to earth's surface；Patent
CN1676870A describes a kind of Convective Heating method, which injects oil shale layer by high-temperature steam, makes the kerogen cracking be
Shale oil gas；United States Patent (USP) US6023554 describes a kind of electrical heating elements in casing, which passes through heat
Radiant heating casing, and the filler between casing and stratum, and then heating oil shale layer are filled in by casing heating.
Since the thermal coefficient of underground hydrocarbon resources is relatively low, there are heating speeds for single heat transfer and heat radiation mode
Slowly, the low problem of efficiency, and the contact area of above-mentioned Convective Heating technology high temperature fluid and oil shale layer is big, heat convection face
Product is big, can faster heating oil shale layer.Chinese patent：CN1676870A, high temperature fluid generating unit therein are deposited in earth's surface
In the problem of big along journey heat loss, not applicable deep oil shale is developed.
Underground hydro carbons ore bed is heated in underground, there is no from ground to the heat loss of hydro carbons ore bed, improves capacity usage ratio.
Chinese patent：CN106304446A, borehole fluid electric heater therein export only single using spring force as check valve
Fastening force, spring elastic extenuation under long-term worst hot case is serious, there are problems that sealing effect cannot be reached.By electric whirlpool
Stream effect and continuous helical deflecting plate structure are combined, and can not only improve the rate of heat addition of downhole fluid heater, are led to simultaneously
Cross change electric current, moreover it is possible to which the effective leakproofness for improving heater outlet prevents downhole fluid reflux corrosion heater body knot
Structure.
Invention content
The object of the present invention is to provide a kind of Novel down-hole electric heater for fluid, solve the existing donwhole heater rate of heat addition
The problems such as low, fluid pressure loss is big, and heater outlet sealing effect is poor.
The present invention by shell, central tube, continuous helical deflecting plate, heating rod, eddy-current coils, insulating layer, seal closure, connect
Wire box, check valve composition.
The upper part of the housing is provided with tapered internal thread, for being connect with central tube, and seals；Tapered internal thread
Outside is provided with power string holes, for across power line.Tapered internal thread lower part is provided with a step, for placing gasket, to shell
The junction of body and central tube is sealed.The lower part of the housing is provided with tapered external screw thread, for being connect with check valve；It is described
Lower part of the housing is provided with bellmouth, for upper valve body fitted seal heater outlet, prevent downhole fluid from flowing back.
The central tube top is provided with tapered internal thread, for being connect with external tool, facilitates tripping in heater.It is tapered
Internal thread lower end boss outer rim is provided with tapered external screw thread, for being connect with shell.It is set in central tube boss lower circumference direction
Injecting hole there are six setting, for injecting downhole fluid into heater.Central tube injecting hole lower part is solid tubing string, solid tubing string
For strengthening eddy current effect when heating fluid and when coil is passed through direct current, the magnetism of strengthening the center pipe improves center
Pipe attracts the reliability of upper valve body, and then improves the Reliability of Microprocessor of check valve.
The continuous helical deflecting plate welds together with central tube, and continuous helical deflecting plate is welded as by baffle plate monomer
One entirety.By the way that continuous helical deflecting plate is split as baffle plate monomer, the accuracy of manufacture of continuous helical deflecting plate can be improved,
The installation difficulty of heater is reduced simultaneously.
The heating rod passes through continuous helical deflecting plate, and welds together with continuous helical deflecting plate, and heating rod is real
The heart.
Eddy-current coils are wrapped in hull outside, are placed between shell and seal closure, and eddy-current coils are encouraged for high temperature resistant
Magnetic coil.
Insulating layer is located at shell and between seal closure, which still has good insulation performance, energy at high temperature
Ensure that coil works normally.
Terminal box is welded on case top, and terminal box is used for sealed motive force line and signal wire, prevents connecting part from short circuit occur.
Check valve includes valve seat, upper valve body, spring, lower valve body and temperature sensor.Valve seat top is provided with tapered interior spiral shell
Line, for being connect with shell.Valve support chamber is provided with gauge hole close to the position of valve seat lower boss, for across temperature sensing
Device.Valve seat lower boss center is provided with through-hole, for placing upper valve body.Go out there are six being uniformly arranged on the outside of valve seat boss centre bore
Stomata passes through for high temperature fluid.Valve seat lower part is provided with conical socket, is used for and lower valve body fitted seal venthole.Upper valve
Body top is tapered for achieving the purpose that closed feed water heater exports with the cooperation of the bellmouth of shell.Upper valve body lower part is uniformly provided with
Four threaded holes, for fixing lower valve body.Spring is placed between upper valve body and valve seat lower boss, in tripping in heater
Closed feed water heater exports.Lower valve body is tapered, achievees the purpose that seal venthole with the tapered groove cooperation in valve seat lower part.Lower valve body
Centre is uniformly driveed there are four hole, for being connect with upper valve body, fixed lower valve body.
In gas injection, fluid forces upper valve body while, drives lower valve body, when fluid flows through check valve upper valve body and under
Opening force is generated at valve body two respectively, upper valve body and lower valve body form two-stage opening force to improve the reliable of check valve breakdown action
Property.When being sealed to heater outlet, stops input AC electricity, persistently inject hot fluid to be added, reduce heater body knot
The temperature of structure.Input dc power again, central tube attracts upper valve body uplink at this time, while driving lower valve body uplink.Lower valve body uplink
With the venthole of the tapered groove fitted seal valve seat of valve seat, primary seal is carried out to heater；Upper valve body uplink and shell
Coniform hole fitted seal heater outlet carries out secondary seal to heater.Secondary linkage by upper valve body and lower valve body is close
Envelope, can effectively improve the sealing reliability of heater outlet.
The operation principle and process of the present invention：
Heat injection well is crept into from earth's surface to underground hydrocarbon resources.It in this heater lower going-into-well, will be passed through hot fluid to be added, realized
Heating to fluid.By the data of temperature sensor feedback, the ginsengs such as the injection rate of the power of alternating current, frequency and fluid are adjusted
Number.When stopping heating, high-frequency alternating current is first closed, continues to inject cryogen to be heated；When the outlet temperature of cryogen
When less than 200 DEG C, it is passed through direct current, slowly reduces the injection rate of hot fluid to be added, realizes the sealing to heater outlet, sealing
Direct current is closed after the completion.
Beneficial effects of the present invention：
The present invention improves donwhole heater by the way that eddy current effect and continuous helical deflecting plate heat exchange structure to be combined
The rate of heat addition, reduce the pressure loss of fluid.By changing input current, heater outlet sealing effect is effectively raised
Fruit.The present invention can be achieved to exploit the superheated steam exploitation of formation at target locations, hot gas.
Description of the drawings
Fig. 1 is the diagrammatic cross-section of the present invention.
Fig. 2 is the schematic diagram that heating rod of the present invention uses polygon arrangement.
Specific implementation mode
It please refers to Fig.1 with shown in Fig. 2, the present invention includes shell 1, central tube 2, continuous helical deflecting plate 3, heating rod 4, electricity
Eddy current coil 5, insulating layer 6, seal closure 7, terminal box 8 and check valve 9；
1 top of the shell is provided with tapered internal thread, for being connect with central tube 2, and seals；Tapered interior spiral shell
It is provided with power string holes on the outside of line, for across power line；Tapered internal thread lower part is provided with a step, for placing gasket 11,
Shell 1 and the junction of central tube 2 are sealed.1 lower part of the shell is provided with tapered external screw thread, is used for and check valve 9
Connection；1 lower part of the shell is provided with bellmouth, for 92 fitted seal heater outlet of upper valve body, prevent downhole fluid
Reflux.
2 top of the central tube is provided with tapered internal thread, for being connect with external tool, facilitates tripping in heater.Cone
Type internal thread lower end boss outer rim is provided with tapered external screw thread, for being connect with shell 1.In 2 boss lower circumference side of central tube
To setting, there are six injecting holes, for injecting downhole fluid into heater.2 injecting hole lower part of central tube is solid tubing string, real
Heart tubing string is for strengthening eddy current effect when heating fluid and when coil is passed through direct current, the magnetism of strengthening the center pipe carries
High central tube attracts the reliability of upper valve body 92, and then improves the reliability of check valve 9.
The continuous helical deflecting plate 3 welds together with central tube 2, and continuous helical deflecting plate 3 is welded by baffle plate monomer
It is connected in an entirety.By the way that continuous helical deflecting plate is split as baffle plate monomer, the manufacture of continuous helical deflecting plate can be improved
Precision, while reducing the installation difficulty of heater.
The heating rod 4 passes through continuous helical deflecting plate 3, and welds together with continuous helical deflecting plate 3, heating rod 4
It is solid.
The eddy-current coils 5 are wrapped in 1 outside of shell, are placed between shell 1 and seal closure 7.
The insulating layer 6 is located at shell 1 and between seal closure 7, which still has good insulation at high temperature
Performance can ensure that coil works normally.
The terminal box 8 is welded on 1 top of shell, and terminal box 8 is used for sealed motive force line and signal wire, prevents connecting part from going out
Existing short circuit.
The check valve 9 includes valve seat 91, upper valve body 92, spring 93, lower valve body 94 and temperature sensor 95.On valve seat 91
Portion is provided with tapered internal thread, for being connect with shell 1.Valve support chamber is provided with gauge hole close to the position of valve seat lower boss,
For passing through temperature sensor.Valve seat lower boss center is provided with through-hole, for placing upper valve body 92.Outside valve seat boss centre bore
Side is uniformly arranged there are six venthole, is passed through for high temperature fluid.91 lower part of valve seat is provided with cone tank, is used for and lower valve body 94
Fitted seal venthole.92 top of upper valve body is tapered for reaching closed feed water heater outlet with the cooperation of the bellmouth of shell 1
Purpose.92 lower part of upper valve body is uniformly opened there are four threaded hole, for fixing lower valve body 94.Spring 93 is placed in upper valve body 92 and valve
Between 91 lower boss of seat, for the closed feed water heater outlet in tripping in heater.Lower valve body 94 is tapered, with 91 lower part of valve seat
Tapered slot cooperation achievees the purpose that seal venthole.94 centre of lower valve body is uniformly driveed there are four hole, is used for and upper valve body 92
Connection, fixed lower valve body 94.
Central tube 2, continuous helical deflecting plate 3 and the heating rod 4 of bringing-up section are solid, for improving continuous helical baffling
The surface temperature of plate heat exchange structure, and then the coefficient of heat transfer of shell-side fluid is improved, improve the rate of heat addition of heater.
The arrangement mode of the heating rod 4 is that fork is arranged, and according to the different setting Multi-layer warming sticks of donwhole heater diameter, is added
The circumferencial direction that is arranged in of hot pin is polygonal arrangement.
The opening and closing of the check valve 9 are realized by upper valve body 91 and the secondary linkage of lower valve body 94, are improved unidirectional
The Reliability of Microprocessor of valve.
Claims (4)
1. a kind of downhole fluid electric heater, it is characterised in that：Including shell (1), central tube (2), continuous helical deflecting plate
(3), heating rod (4), eddy-current coils (5), insulating layer (6), seal closure (7), terminal box (8) and check valve (9)；
Shell (1) top is provided with tapered internal thread, for being connect with central tube (2), and seals；Tapered interior spiral shell
It is provided with power string holes on the outside of line, for across power line；Tapered internal thread lower part is provided with a step, for placing gasket
(11), shell (1) and the junction of central tube (2) are sealed；Shell (1) lower part is provided with tapered external screw thread, for
Check valve (9) connects；Shell (1) lower part is provided with bellmouth, for upper valve body (92) fitted seal heater outlet, prevent
Downhole fluid flows back；
Central tube (2) top is provided with tapered internal thread, for being connect with external tool；Outside tapered internal thread lower end boss
Edge is provided with tapered external screw thread, for being connect with shell (1)；There are six gas injections for the setting of central tube (2) boss lower circumference direction
Hole, for injecting downhole fluid into heater；Central tube (2) injecting hole lower part is solid tubing string；
The continuous helical deflecting plate (3) welds together with central tube (2), and continuous helical deflecting plate (3) is by baffle plate monomer
It is welded as a whole；
The heating rod (4) passes through continuous helical deflecting plate (3), and welds together with continuous helical deflecting plate (3), heating rod
(4) it is solid；
The eddy-current coils (5) are wrapped on the outside of shell (1), are placed between shell (1) and seal closure (7)；
The insulating layer (6) is located at shell (1) and between seal closure (7)；
The terminal box (8) is welded at the top of shell (1), and terminal box (8) is used for sealed motive force line and signal wire, prevents connecting part
There is short circuit；
The check valve (9) includes valve seat (91), upper valve body (92), spring (93), lower valve body (94) and temperature sensor (95)；
Valve seat (91) top is provided with tapered internal thread, for being connect with shell (1)；Valve support chamber is opened close to the position of valve seat lower boss
There is gauge hole, for across temperature sensor；Valve seat lower boss center is provided with through-hole, for placing upper valve body (92)；Valve
Venthole there are six being uniformly arranged on the outside of seat boss centre bore, passes through for high temperature fluid；Valve seat (91) lower part is provided with taper
Slot is used for and lower valve body (94) fitted seal venthole；Upper valve body (92) top is that the tapered bellmouth for shell (1) is matched
Conjunction achievees the purpose that closed feed water heater exports；Upper valve body (92) lower part is uniformly opened there are four threaded hole, for fixing lower valve body
(94)；Spring (93) is placed between upper valve body (92) and valve seat (91) lower boss, for the heated sealed in tripping in heater
Device exports；Lower valve body (94) is tapered, achievees the purpose that seal venthole with the tapered groove cooperation in valve seat (91) lower part；Lower valve body
(94) centre is uniformly driveed there are four hole, for being connect with upper valve body (92), fixed lower valve body (94).
2. a kind of downhole fluid electric heater according to claim 1, it is characterised in that：The central tube (2) of bringing-up section connects
Continuous helical baffles (3) and heating rod (4) are solid.
3. a kind of downhole fluid electric heater according to claim 1, it is characterised in that：The arrangement of the heating rod (4)
Mode is that fork is arranged, and according to the different setting Multi-layer warming sticks of donwhole heater diameter, the circumferencial direction that is arranged in of heating rod is more
Side shape arrangement.
4. a kind of downhole fluid electric heater according to claim 1, it is characterised in that：The unlatching of the check valve (9)
It is realized by upper valve body (91) and the secondary linkage of lower valve body (94) with closing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357458.0A CN108505971B (en) | 2018-04-20 | 2018-04-20 | Downhole fluid electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357458.0A CN108505971B (en) | 2018-04-20 | 2018-04-20 | Downhole fluid electric heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108505971A true CN108505971A (en) | 2018-09-07 |
| CN108505971B CN108505971B (en) | 2023-09-22 |
Family
ID=63383119
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810357458.0A Active CN108505971B (en) | 2018-04-20 | 2018-04-20 | Downhole fluid electric heater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108505971B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101220740A (en) * | 2008-01-25 | 2008-07-16 | 朱成林 | Electric heating apparatus of hollow sucker rod |
| CN101235711A (en) * | 2007-01-31 | 2008-08-06 | 辽宁华孚石油高科技股份有限公司 | Hollow sucker rod electric heater unit |
| CN102943647A (en) * | 2012-11-23 | 2013-02-27 | 天津正本自控系统有限公司 | Oil well thick oil heating system |
| CN105064956A (en) * | 2015-07-30 | 2015-11-18 | 西安石油大学 | Screw type efficient oil pumping device |
| CN105443096A (en) * | 2015-12-29 | 2016-03-30 | 中国石油天然气股份有限公司 | Underground electric heating steam generating device |
| WO2016178046A1 (en) * | 2015-05-05 | 2016-11-10 | Total Sa | Downhole heating device to be introduced in a well bored in an underground formation containing a solid hydrocarbonaceous layer, related installation, and method |
| CN106304446A (en) * | 2016-10-14 | 2017-01-04 | 吉林大学 | A kind of borehole fluid electric heater |
| CN106869859A (en) * | 2015-12-11 | 2017-06-20 | 天津振达泵业有限公司 | A kind of well head heats component |
| CN107288583A (en) * | 2017-08-07 | 2017-10-24 | 吉林大学 | A kind of tandem varying pitch downhole fluid electric heater |
| CN208168849U (en) * | 2018-04-20 | 2018-11-30 | 吉林大学 | A kind of downhole fluid electric heater |
-
2018
- 2018-04-20 CN CN201810357458.0A patent/CN108505971B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101235711A (en) * | 2007-01-31 | 2008-08-06 | 辽宁华孚石油高科技股份有限公司 | Hollow sucker rod electric heater unit |
| CN101220740A (en) * | 2008-01-25 | 2008-07-16 | 朱成林 | Electric heating apparatus of hollow sucker rod |
| CN102943647A (en) * | 2012-11-23 | 2013-02-27 | 天津正本自控系统有限公司 | Oil well thick oil heating system |
| WO2016178046A1 (en) * | 2015-05-05 | 2016-11-10 | Total Sa | Downhole heating device to be introduced in a well bored in an underground formation containing a solid hydrocarbonaceous layer, related installation, and method |
| CN105064956A (en) * | 2015-07-30 | 2015-11-18 | 西安石油大学 | Screw type efficient oil pumping device |
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| CN105443096A (en) * | 2015-12-29 | 2016-03-30 | 中国石油天然气股份有限公司 | Underground electric heating steam generating device |
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| CN107288583A (en) * | 2017-08-07 | 2017-10-24 | 吉林大学 | A kind of tandem varying pitch downhole fluid electric heater |
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| Title |
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| Publication number | Publication date |
|---|---|
| CN108505971B (en) | 2023-09-22 |
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