CN107288583A - A kind of tandem varying pitch downhole fluid electric heater - Google Patents
A kind of tandem varying pitch downhole fluid electric heater Download PDFInfo
- Publication number
- CN107288583A CN107288583A CN201710665057.7A CN201710665057A CN107288583A CN 107288583 A CN107288583 A CN 107288583A CN 201710665057 A CN201710665057 A CN 201710665057A CN 107288583 A CN107288583 A CN 107288583A
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- CN
- China
- Prior art keywords
- heating rod
- central tube
- bearing
- cable
- 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 34
- 238000010438 heat treatment Methods 0.000 claims abstract description 159
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000009413 insulation Methods 0.000 claims description 24
- 239000000565 sealant Substances 0.000 claims description 18
- 238000012856 packing Methods 0.000 claims description 17
- 238000007789 sealing Methods 0.000 claims description 16
- 239000000945 filler Substances 0.000 claims description 13
- 230000005611 electricity Effects 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000002265 prevention Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims 1
- 239000004058 oil shale Substances 0.000 abstract description 18
- 230000006378 damage Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 11
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 239000007924 injection Substances 0.000 description 8
- 238000002347 injection Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- 238000011065 in-situ storage Methods 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000003416 augmentation Effects 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000243 solution 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
-
- 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
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/127—Packers; Plugs with inflatable sleeve
-
- 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)
- Resistance Heating (AREA)
Abstract
The invention discloses a kind of tandem varying pitch downhole fluid electric heater, first wire connection cavity, primary heater, the second wire connection cavity, secondary heater, the 3rd wire connection cavity, three-level heater and packer composition, primary heater, secondary heater and three-level heater are sequentially connected and connect, packer is arranged on three-level heater, first wire connection cavity is arranged on primary heater, second wire connection cavity is arranged between primary heater and secondary heater, and the 3rd wire connection cavity is arranged between secondary heater and three-level heater；Present invention reduces the manufacture difficulty of long length helical baffles, the shortcoming that long length helical baffles under worst hot case are also easy to produce heating power destruction is overcome, the pressure loss of fluid is small during heating fluid, and heat transfer coefficient is high.The present invention can realize superheated steam exploitation, the hot gas exploitation to formation at target locations, and the reservoirs such as exploitation combustible ice, oil shale, viscous crude are can also be used for after the heater is optimized.
Description
Technical field
Underground heat injection field, more particularly to a kind of tandem varying pitch downhole fluid are converted the present invention relates to oil shale in-situ
Electric heater.
Background technology
Oil shale development technique is divided into earth's surface retorting technique and underground retoring technology.Earth's surface retorting technique is current China's profit
With the technical way of oil shale, but earth's surface retorting technique has that mining cost is high, and slag is stacked dangerous high；Air and ground
Lower water pollution is big, and water consumption is big；The shortcomings of being not suitable for deep oil shale recovery.Underground retoring technology is called converted in-situ technology,
Converted in-situ technology refers in oil shale ore bed that to oil shale layer progress situ heat treatment it is shale oil gas to make kerogen cracking
Technological means.Converted in-situ technology, which has, does not destroy earth's surface, environmentally safe, is adapted to the advantages of deep oil shale layer is developed.
Oil shale in-situ conversion heating means have heat transfer, thermal convection current, three kinds of heat radiation.Heat transfer heating means are by electricity
Resistance heater, which is placed in well, directly heats destination layer, and such as United States Patent (USP) US2548360 describes one kind and is placed in well viscous oil
In electrical heating elements, viscous oil heats and diluted by the heating element heater, makes the viscosity reduction of oil, so that by its pump to earth's surface；
Patent CN1676870A describes a kind of Convective Heating method, and high-temperature steam is injected oil shale layer, splits kerogen by the invention
Solve as shale oil gas；United States Patent (USP) US6023554 describes a kind of electrical heating elements being located in sleeve pipe, and the heating element heater passes through
Heat radiation heating muff, and the filler being filled between sleeve pipe and stratum, and then heating oil shale layer are heated by sleeve pipe.
Because the thermal conductivity factor of oil shale is relatively low, there is firing rate slowly in single heat transfer and heat radiation mode, efficiency
Low the problem of, and the contact area of above-mentioned Convective Heating technology high temperature fluid and oil shale layer is big, heat convection area is big, energy
Faster heating oil shale layer.Chinese patent：CN1676870A, high temperature fluid generating unit therein exists along journey in earth's surface
Heat loss is big, the problem of inapplicable deep oil shale is developed.
The content of the invention
Present invention aim to address fluid pressure loss during existing donwhole heater heating fluid greatly, long length spiral plate
Heater manufacture difficulty is big, and long length spiral plate is also easy to produce heating power destruction under worst hot case, in the heater second half section due to fluid
It is heated, there is provided a kind of tandem varying pitch downhole fluid electric heater for the problems such as heat transfer coefficient of heater is reduced.
The present invention is by the first wire connection cavity, primary heater, the second wire connection cavity, secondary heater, the 3rd wire connection cavity, three-level
Heater and packer composition, primary heater, secondary heater and three-level heater are sequentially connected and connect, and packer is arranged on three
On level heater, the first wire connection cavity is arranged on primary heater, and the second wire connection cavity is arranged on primary heater and two grades of heating
Between device, the 3rd wire connection cavity is arranged between secondary heater and three-level heater；
First cable passage of the electric heater, the second cable passage, the 3rd cable passage are by two semi-circular pipes
It is welded with central partition plate, forms the passage of two closings, prevents signal wire from high frequency when undiscovered screen layer is damaged occur
Alternating current produces interference to signal wire, prevents three-phase electricity from producing current vortex in the heater, when heater works, from channel inlet
Mouth injection cold air is cooled down to cable passage, it is ensured that cable does not produce high temperature failure, is conducive to heater for a long time in height
Run under warm operating mode；
First wire connection cavity includes lifting lock ring, the first separate terminal enclosure, the first cable tube, the first wiring flexible pipe, the first sealing
Packing ring, lifting lock ring, which is connected through a screw thread, to be arranged on the first heating rod bearing, and fixes the first separate terminal enclosure, the first separate terminal enclosure
Ring lower end caused by lifting is arranged on, the first cable tube is arranged in the first wire connection cavity, and passes through the first separate terminal enclosure, the first cable tube
Lower end is together by a threaded connection with four the first electrically heated rods, is connected on the inside of the first cable tube with the first cable passage,
The top of first cable tube is provided with signal string holes in signal wire channel side, for through signal wire；It is provided with power line channel side
Power string holes, for through power line, being provided with channel inlet mouthful above central partition plate, for being injected to both sides cable passage
Cryogenic gas, reduces channel temperature, prevents signal wire and power line from producing high temperature failure, the first wiring flexible pipe is arranged on First Line
Between cable pipe and the first electrically heated rod, connected, for power line to be isolated from the outside, prevented by underground water by active joint
Erosion, it is to avoid wire connection cavity water inlet occurs accident, the first seal washer is arranged between the first separate terminal enclosure and the first housing, and close
Seal the first wire connection cavity；
Primary heater includes the first heating rod bearing, the first electrically heated rod, the first heating rod locking nut, the first heating
Rod sealant, the first cable passage, the first helical baffles, the first central tube thermal insulation layer, the first central tube, first sensor
Hole, the first housing, the first sealing ring, the first heating rod bearing are arranged on the first case inside, are connected with the first housing by screw thread
Connect, the first electrically heated rod annular is arranged on the first heating rod bearing, and fixed by the first heating rod locking nut, first adds
Hot pin sealant is arranged between the first electrically heated rod and the first heating rod bearing, and is compacted by the first heating rod locking nut,
The upper end of first cable passage passes through the first heating rod bearing, and is connected with the first cable tube, the first cable passage lower end with
Second cable passage upper end welds together, the first central tube thermal insulation layer be arranged on the first cable passage and the first central tube it
Between, play a part of preventing heat from being delivered to the first cable passage from the first central tube, the first central tube is arranged on the first center
Pipe thermal insulation layer outer shroud, through the central tube of the first helical baffles, is connected, in first with the first helical baffles by electric welding
Heart pipe bottom is together with the second central tube upper weld, and the first helical baffles are arranged in first shell body, through in first
Heart pipe and the first electrically heated rod, are connected by being welded, and guide functions, augmentation of heat transfer, first sensor hole are played to institute's hot gas
The first central tube is arranged on close to the position of the first electrically heated rod afterbody, for through sensor, the first housing bottom to be set
There are four bolts hole, for connecting the second connecting bolt；
Second wire connection cavity includes the second seal washer, the second separate terminal enclosure, the second connecting bolt, the second connects bearing, second
Cable tube, the second connection flexible pipe, the second seal washer, the second seal washer be arranged on the first housing and the second connects bearing it
Between, connected by the second connecting bolt, the second separate terminal enclosure is arranged on the outside of the second connects bearing, and spiral shell is passed through with the second connects bearing
Line is connected, and the second connects bearing is arranged between the first housing and the second heating rod bearing, is connected by the second connecting bolt, the
The second seal washer, the second cable tube lower end are respectively arranged between two connects bearings, the first housing and the second heating rod bearing
The connection of flexible pipe upper end is connected with second, power line is hedged off from the outer world, the second wiring flexible pipe upper end and the second cable tube lower end phase
Connection, the second wiring flexible pipe lower end is connected with the second electrically heated rod upper end, the second sealing ring be arranged on the second connects bearing and
Between second heating rod bearing；
Secondary heater includes adding the second heating rod bearing, the second electrically heated rod, the second heating rod locking nut, second to add
Hot pin sealant, the second cable passage, the second helical baffles, the second central tube thermal insulation layer, the second central tube, second sensor
Hole, the second housing and the second sealing ring, the second heating rod bearing are threadedly attached in second shell body, the second heating rod bearing
It is upper that there are four the first heating rod holes and four the first bolts hole, and it is respectively used to the second electrically heated rod of connection and the second connection spiral shell
Bolt, the second electrically heated rod is arranged on the first heating rod hole of the second heating rod bearing, and the second heating rod locking nut is arranged on
At the external screw thread of second electrically heated rod upper end, the second heating rod sealant is arranged between the second electrically heated rod and heating rod hole
In annular space, for being sealed to heating rod hole, the second cable passage passes through the second connects bearing, connects with the second cable tube
Connect, the second cable passage upper end is welded with the first cable passage lower end, the second cable passage lower end and the 3rd cable passage upper end
Connection, the second helical baffles are arranged in second shell body, through the second electrically heated rod and through the second central tube, and with second
Central tube is welded, and guide functions are played to added hot fluid, and the second central tube thermal insulation layer is arranged on the second cable passage outer shroud, prevented
Heat is transferred to the second cable passage from the second central tube, and the second central tube is arranged on the second central tube thermal insulation layer outer shroud, passed through
The central tube of second helical baffles, with the second spiral baffling plate weld, the second central tube top and the first central tube bottom
Weld together, the second central tube lower end welds together with the 3rd central tube upper end, and second sensor hole is arranged in second
On heart pipe, for through sensor, the second housing bottom to be provided with four the second bolts hole, for the 3rd connecting bolt phase
Connection；
3rd wire connection cavity includes the 3rd seal washer, the 3rd separate terminal enclosure, the 3rd connecting bolt, the 3rd connects bearing, the 3rd
Cable tube, the 3rd connection flexible pipe and the 3rd seal washer, the 3rd seal washer are arranged on the second shell end, and the 3rd connection branch
Between seat, connected by the 3rd connecting bolt, the 3rd separate terminal enclosure is arranged on the outside of the 3rd connects bearing, it is logical with the 3rd connects bearing
Threaded connection is crossed, the 3rd connects bearing is arranged between the second housing and the 3rd heating rod bearing, and passes through the 3rd connecting bolt
Connection, the 3rd connects bearing and the second housing are provided with the 3rd seal washer, the 3rd line between the 3rd heating rod bearing respectively
Cable pipe lower end is connected the connection of flexible pipe upper end with the 3rd, and power line is hedged off from the outer world, the 3rd wiring flexible pipe upper end and the 3rd cable
Pipe lower end is connected, and the 3rd wiring flexible pipe lower end is connected with the 3rd electrically heated rod upper end, and the 3rd sealing ring is arranged on the 3rd company
Connect between bearing and the 3rd heating rod bearing；
Three-level heater includes adding the 3rd heating rod bearing, the 3rd electrically heated rod, the 3rd heating rod locking nut, the 3rd to add
Hot pin sealant, the 3rd cable passage, the 3rd helical baffles, the 3rd central tube thermal insulation layer, the 3rd central tube, 3rd sensor
Hole, the first check valve, the 3rd housing, the 3rd sealing ring, the 3rd heating rod bearing are arranged in the 3rd housing, and pass through screw thread phase
There are four the 3rd heating rod holes and four the 3rd bolts hole, respectively with the 3rd electrically heated rod on connection, the 3rd heating rod bearing
It is engaged with the 3rd connecting bolt, the 3rd electrically heated rod is arranged on the 3rd heating rod hole of the 3rd heating rod bearing, the 3rd adds
Hot pin locking nut is arranged at the external screw thread of the 3rd electrically heated rod upper end, and the 3rd heating rod sealant is arranged on the 3rd electrical heating
In annular space between rod and the 3rd heating rod hole, for being sealed to the 3rd heating rod hole, the 3rd cable passage is passed through
3rd connects bearing is connected with the 3rd cable tube, and the 3rd cable passage upper end is welded with the second cable passage lower end, the 3rd spiral
Deflection plate is arranged in the 3rd housing, through the 3rd electrically heated rod and the 3rd central tube, and is welded together with the 3rd central tube,
Guide functions are played to added hot fluid, the 3rd central tube thermal insulation layer is arranged on the 3rd cable passage outer shroud, prevents heat from the 3rd
Central tube is transferred to the 3rd cable passage, and the 3rd central tube is arranged on the 3rd central tube thermal insulation layer outer shroud, through the 3rd spiral folding
The central tube of plate is flowed, with the 3rd spiral baffling plate weld, the 3rd central tube upper end welds together with the second central tube lower end,
3rd sensor hole is arranged on the 3rd central tube, for through sensor, the first check valve to be arranged on the bottom of the 3rd central tube
End, the 3rd housing bottom is provided with four the 3rd bolts hole, and is connected with one-way valve seat；
Packer include connecting bolt, check valve, upper end cover, packing element, packerfoot, set filler, thermometal ring,
Bottom end cover, upper end cover is identical with bottom end cover structure；
Upper end cover includes end cap set, end cap becket, upper end cover set, end cover connecting bolt；
End cap becket is arranged between end cap set and upper end cover set, is connected between end cap set and upper end cover set by end cap
Bolt connection；
Connecting bolt is used to connect check valve and the 3rd housing bottom, and check valve upper end is with the 3rd housing bottom by being connected
Bolt is connected, and check valve lower end is connected with packerfoot, and upper end cover is placed in packerfoot top, is connected through a screw thread,
Packing element is placed between upper end cover and bottom end cover, is provided with the outside of packing element under thermometal ring, packerfoot upper end and check valve
End connection, packerfoot lower end is connected with bottom end cover, sets the annular space that filler is arranged between packerfoot and packing element,
Thermometal ring is placed on the outside of packing element, and bottom end cover is arranged on the lower end of packerfoot；
The first heating rod bearing, the second heating rod bearing, the 3rd heating rod bearing are involute bearing, first shell
Body, the second housing, the 3rd housing are tapering type bearing, the local pressure loss for reducing fluid；
First electrically heated rod, the second electrically heated rod, the 3rd electrically heated rod are screw tube type electrically heated rod, its outer surface
There is shape of threads projection, the heat transfer area for increasing electrically heated rod reduces the boundary layer thickness of heating rod wall fluid, improves and adds
Heat transfer property between hot pin and fluid；
Described the first helical baffles, the second helical baffles and the 3rd helical baffles are continuous helical deflecting plate,
Using three-level pitch, the pitch of the first helical baffles is maximum, and the pitch of the second helical baffles is taken second place, the 3rd helical baffles
Pitch it is minimum, the combination property of heater is improved by improving heat transfer coefficient step by step；
First seal washer, the second seal washer and the 3rd seal washer are graphite gasket；
Second connects bearing and the 3rd connects bearing cross section are in I-shaped；
The filler that sets is the larger temperature-sensitive material of thermal coefficient of expansion, and the expansion of filler large volume is set when heated,
Packing element is expanded outwardly, realization is set, when deblocking, stop heat injection, set filler contraction, realize deblocking；
The end cap becket cross section is I-shaped.
The operation principle and process of the present invention：
This heater is vertically placed in well, air (may also be nitrogen, carbon dioxide, water or other fluid) is passed through as biography
Thermal medium, is passed through air (gas such as nitrogen, carbon dioxide) as cryogen, reduces the temperature in cable passage, then right
Oil shale block carries out drilling well work, and carries out tripping in sleeve pipe in pressure break, well to destination layer；Lower going-into-well after the debugging of this heater
It is interior, and preheat, the parameters of this heater are observed, are reached after requirement, starts gas injection and injection normal temperature air, packer is entered
Row is set；Monitor the parameters of this heater in real time by ground display device, it is to avoid heating rod wall surface temperature exceedes heating
The highest tolerable temperature of rod；When needing to carry this heater, stop heating, continue to inject air, packer solution after a period of time
Envelope, above carries this heater.
Beneficial effects of the present invention：
Present invention reduces the manufacture difficulty of long length helical baffles, long length spiral baffling under worst hot case is overcome
Plate is also easy to produce the shortcoming of heating power destruction, and the pressure loss of fluid is small during heating fluid, and heat transfer coefficient is high.The present invention can be realized pair
Superheated steam exploitation, the hot gas exploitation of formation at target locations.Can also be used for after the heater is optimized exploitation combustible ice, oil shale,
The reservoirs such as viscous crude.
Brief description of the drawings
Fig. 1 is partial cutaway schematic view in the present invention.
Fig. 2 is center section diagrammatic cross-section of the present invention.
Fig. 3 is partial cutaway schematic view under the present invention.
Fig. 4 is A-A in Fig. 2 to sectional view.
Embodiment
Refer to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, the present invention is by the first wire connection cavity 1, primary heater 2, the second wiring
Chamber 3, secondary heater 4, the 3rd wire connection cavity 5, three-level heater 6 and packer 7 are constituted, primary heater 2, secondary heater 4
It is sequentially connected and connects with three-level heater 6, packer 7 is arranged on three-level heater 6, the first wire connection cavity 1 is arranged on one-level heating
On device 2, the second wire connection cavity 3 is arranged between primary heater 2 and secondary heater 4, and the 3rd wire connection cavity 5 is arranged on two grades of heating
Between device 4 and three-level heater 6；
First cable passage 25 of the electric heater, the second cable passage 45, the 3rd cable passage 65 are by two semicircles
Shape pipeline and central partition plate are welded, and form the passage of two closings, prevent signal wire from undiscovered screen layer occur and damaging
When high-frequency alternating current interference is produced to signal wire, prevent that three-phase electricity from producing current vortex in the heater, when heater works, from logical
Road air inlet injection cold air is cooled down to cable passage, it is ensured that cable does not produce high temperature failure, when being conducive to heater long
Between under worst hot case run；
First wire connection cavity 1 include lifting lock ring 11, the first separate terminal enclosure 12, the first cable tube 13, the first wiring flexible pipe 14,
First seal washer 15, lifting lock ring 11 is connected through a screw thread and is arranged on the first heating rod bearing 21, and fixes first and connect
Irdome 12, the first separate terminal enclosure 12 is arranged on the lower end of ring 11 caused by lifting, and the first cable tube 13 is arranged in the first wire connection cavity 1, and
Through the first separate terminal enclosure 12, the lower end of the first cable tube 13 is together by a threaded connection with four the first electrically heated rods 22, and first
The inner side of cable tube 13 is connected with the first cable passage 25, and the top of the first cable tube 13 is provided with signal wire in signal wire channel side
Hole 131, for through signal wire；Power string holes 132 is provided with power line channel side, for through power line, in central partition plate
Top is provided with channel inlet mouthful 133, for injecting cryogenic gas to both sides cable passage, reduces channel temperature, anti-stop signal
Line and power line produce high temperature failure, and the first wiring flexible pipe 14 is arranged between the first cable tube 13 and the first electrically heated rod 22,
Connected by active joint, for power line to be isolated from the outside, prevent from being corroded by underground water, it is to avoid wire connection cavity water inlet hair
Make trouble former, the first seal washer 15 is arranged between the first separate terminal enclosure 12 and the first housing 201, and seal the first wire connection cavity 1；
Primary heater 2 include the first heating rod bearing 21, the first electrically heated rod 22, the first heating rod locking nut 23,
In first heating rod sealant 24, the first cable passage 25, the first helical baffles 26, the first central tube thermal insulation layer 27, first
Heart pipe 28, first sensor hole 29, the first housing 201, the first sealing ring 202, the first heating rod bearing 21 are arranged on first shell
The inner side of body 201, is connected through a screw thread, the annular of the first electrically heated rod 22 is arranged on the first heating rod bearing 21 with the first housing 201
On, and fixed by the first heating rod locking nut 23, the first heating rod sealant 24 is arranged on the first electrically heated rod 22 and
Between one heating rod bearing 21, and it is compacted by the first heating rod locking nut 23, the upper end of the first cable passage 25 passes through first
Heating rod bearing 21, and be connected with the first cable tube 13, the lower end of the first cable passage 25 is welded with the upper end of the second cable passage 45
It is connected together, the first central tube thermal insulation layer 27 is arranged between the first cable passage 25 and the first central tube 28, plays prevention heat
Amount is delivered to the effect of the first cable passage 25 from the first central tube 28, and the first central tube 28 is arranged on the first central tube thermal insulation layer
27 outer shrouds, through the central tube of the first helical baffles 26, are connected, the first central tube with the first helical baffles by electric welding
28 bottoms are together with the upper weld of the second central tube 48, and the first helical baffles 26 are arranged in the first housing 201, through
One central tube 28 and the first electrically heated rod 22, are connected by being welded, and guide functions, augmentation of heat transfer, first are played to institute's hot gas
Gauge hole 29 is arranged on the first central tube 28 close to the position of the afterbody of the first electrically heated rod 22, for through sensor, first
The bottom of housing 201 is provided with four bolts hole, for connecting the second connecting bolt 33；
Second wire connection cavity 3 includes the second seal washer 31, the second separate terminal enclosure 32, the second connecting bolt 33, second connection branch
Seat the 34, second cable tube 35, second connection flexible pipe 36, the second seal washer 37, the second seal washer 31 are arranged on the first housing
201 and second between connects bearing 34, are connected, the second separate terminal enclosure 32 is arranged on the second connects bearing by the second connecting bolt 33
34 outsides, are connected through a screw thread, the second connects bearing 34 is arranged on the first housing 201 and the second heating rod with the second connects bearing
Between bearing 41, connected by the second connecting bolt 33, the second connects bearing 34, the first housing 201 and the second heating rod bearing
The second seal washer 31 is respectively arranged between 41, the lower end of the second cable tube 35 is connected the connection of the upper end of flexible pipe 36 with second, will be dynamic
The line of force is hedged off from the outer world, and the upper end of the second wiring flexible pipe 36 is connected with the lower end of the second cable tube 35, the lower end of the second wiring flexible pipe 36
It is connected with the upper end of the second electrically heated rod 42, the second sealing ring 37 is arranged on the second connects bearing 34 and the second heating rod bearing 41
Between；
Secondary heater 4 includes plus the second heating rod bearing 41, the second electrically heated rod 42, the second heating rod locking nut
43rd, the second heating rod sealant 44, the second cable passage 45, the second helical baffles 46, the second central tube thermal insulation layer 47, second
Central tube 48, second sensor hole 49, the second housing 401 and the second sealing ring 402, the second heating rod bearing 41 are connected by screw thread
It is connected in the second housing 402, there are four the first heating rod holes and four the first bolts hole on the second heating rod bearing, and respectively
For connecting the second electrically heated rod 42 and the second connecting bolt 33, the second electrically heated rod 42 is arranged on the second heating rod bearing 41
On first heating rod hole, the second heating rod locking nut 43 is arranged at the external screw thread of the upper end of the second electrically heated rod 42, and second adds
Hot pin sealant 44 is arranged in the annular space between the second electrically heated rod 42 and heating rod hole, for being carried out to heating rod hole
Sealing, the second cable passage 45 pass through the second connects bearing 34, be connected with the second cable tube 35, the upper end of the second cable passage 45 with
The lower end of first cable passage 25 is welded, and the lower end of the second cable passage 45 is connected with the upper end of the 3rd cable passage 65, the second spiral folding
Stream plate 46 be arranged in the second housing 401, through the second electrically heated rod 42 and through the second central tube 48, and with the second central tube
Welding, guide functions are played to added hot fluid, and the second central tube thermal insulation layer 47 is arranged on the outer shroud of the second cable passage 45, prevents heat
Amount is transferred to the second cable passage 45 from the second central tube 48, and the second central tube 48 is arranged on outside the second central tube thermal insulation layer 47
Ring, through the central tube of the second helical baffles 46, is welded with the second helical baffles 46, the top of the second central tube 48 and the
Together, the lower end of the second central tube 48 welds together the lower weld of one central tube 28 with the 3rd central tube upper end, the second sensing
Device hole 49 is arranged on the second central tube 48, for through sensor, the bottom of the second housing 401 to be provided with four the second bolts
Hole, for being connected with the 3rd connecting bolt 53；
3rd wire connection cavity 5 includes the 3rd seal washer 51, the 3rd separate terminal enclosure 52, the 3rd connecting bolt the 53, the 3rd connection branch
Seat the 54, the 3rd cable tube the 55, the 3rd connection seal washer 57 of flexible pipe 56 and the 3rd, the 3rd seal washer 51 is arranged on the second housing
Between 401 ends, and the 3rd connects bearing 54, connected by the 3rd connecting bolt 53, the 3rd separate terminal enclosure 52 is arranged on the 3rd company
The outside of bearing 54 is connect, is connected through a screw thread with the 3rd connects bearing, the 3rd connects bearing 54 is arranged on the second housing 401 and the 3rd
Between heating rod bearing 61, and connected by the 3rd connecting bolt 53, the 3rd connects bearing 54 and the second housing 401 are respectively with
The 3rd seal washer 51 is provided between three heating rod bearings 61, the lower end of the 3rd cable tube 55 is connected the upper end of flexible pipe 56 company with the 3rd
Connect, power line is hedged off from the outer world, the upper end of the 3rd wiring flexible pipe 56 is connected with the lower end of the 3rd cable tube 55, the 3rd wiring flexible pipe
56 lower ends are connected with the upper end of the 3rd electrically heated rod 62, and the 3rd sealing ring 57 is arranged on the 3rd connects bearing 54 and the 3rd heating rod
Between bearing 61；
Three-level heater 6 includes plus the 3rd heating rod bearing 61, the 3rd electrically heated rod 62, the 3rd heating rod locking nut
63rd, the 3rd heating rod sealant 64, the 3rd cable passage 65, the 3rd helical baffles 66, the 3rd central tube thermal insulation layer the 67, the 3rd
Central tube 68,3rd sensor hole 691, the first check valve 692, the 3rd housing 601, the 3rd sealing ring 602, the 3rd heating rod branch
Seat 61 is arranged in the 3rd housing 601, and is connected by screw thread, has four the 3rd heating rod holes on the 3rd heating rod bearing
With four the 3rd bolts hole, it is engaged respectively with the 3rd electrically heated rod 62 and the 3rd connecting bolt 63, the 3rd electrically heated rod 62 is set
Put on the 3rd heating rod hole of the 3rd heating rod bearing 61, the 3rd heating rod locking nut 63 is arranged on the 3rd electrically heated rod 62
At the external screw thread of upper end, the 3rd heating rod sealant 64 is arranged on the annular between the 3rd electrically heated rod 62 and the 3rd heating rod hole
In space, for being sealed to the 3rd heating rod hole, the 3rd cable passage 65 passes through the 3rd connects bearing 64 and the 3rd cable
Pipe is connected, and the upper end of the 3rd cable passage 65 is welded with the lower end of the second cable passage 35, and the 3rd helical baffles 66 are arranged on the 3rd
In housing 601, weld together through the 3rd electrically heated rod 62 and the 3rd central tube 68, and with the 3rd central tube 68, to added
Hot fluid plays guide functions, and the 3rd central tube thermal insulation layer 67 is arranged on the outer shroud of the 3rd cable passage 65, prevents heat from the 3rd
Heart pipe 68 is transferred to the 3rd cable passage 65, and the 3rd central tube 68 is arranged on the outer shroud of the 3rd central tube thermal insulation layer 67, through the 3rd
The central tube of helical baffles 66, is welded with the 3rd helical baffles 66, the upper end of the 3rd central tube 68 and the second central tube 48
Lower end welds together, and 3rd sensor hole 69 is arranged on the 3rd central tube 68, for through sensor, the first check valve
692 are arranged on the bottom of the 3rd central tube 68, and the bottom of the 3rd housing 601 is provided with four the 3rd bolts hole, and and check valve
Seat 72 is connected；
Packer 7 includes connecting bolt 71, check valve 72, upper end cover 73, packing element 74, packerfoot 75, sets filler
76th, thermometal ring 77, bottom end cover 78, upper end cover 73 are identical with the structure of bottom end cover 78；
Upper end cover 73 includes end cap set 731, end cap becket 732, upper end cover set 733, end cover connecting bolt 734；
End cap becket 732 is arranged between end cap set 731 and upper end cover set 733, end cap set 731 and upper end cover set 733
Between connected by end cover connecting bolt 734；
Connecting bolt 71 is used to connect check valve 72 and the bottom of the 3rd housing 601, the upper end of check valve 72 and the 3rd housing 601
Bottom is connected by connecting bolt 71, and the lower end of check valve 72 is connected with packerfoot 75, and upper end cover 73 is placed in packer branch
Seat top, is connected through a screw thread, packing element 74 is placed between upper end cover 73 and bottom end cover 78, and the outside of packing element 74 is provided with thermometal
Ring, the upper end of packerfoot 75 is connected with the lower end of check valve 72, and the lower end of packerfoot 75 is connected with bottom end cover, sets filler
76 are arranged on the annular space between packerfoot 75 and packing element 74, and thermometal ring 77 is placed in the outside of packing element 74, and bottom end cover 78 is set
Put in the lower end of packerfoot 75；
The first heating rod bearing 21, the second heating rod bearing 41, the 3rd heating rod bearing 61 are involute bearing, the
One housing 201, the second housing 401, the 3rd housing 601 are tapering type bearing, the local pressure loss for reducing fluid；
First electrically heated rod 22, the second electrically heated rod 42, the 3rd electrically heated rod 62 are screw tube type electrically heated rod, its
There is shape of threads projection outer surface, the heat transfer area for increasing electrically heated rod, reduces the boundary layer thickness of heating rod wall fluid,
Improve the heat transfer property between heating rod and fluid；
Described the first helical baffles 26, the second helical baffles 46 and the 3rd helical baffles 66 are rolled over for continuous helical
Plate is flowed, using three-level pitch, the pitch of the first helical baffles 26 is maximum, and the pitch of the second helical baffles 46 is taken second place, the 3rd
The pitch of helical baffles 66 is minimum, and the combination property of heater is improved by improving heat transfer coefficient step by step；
First seal washer 15, the second seal washer 31 and the 3rd seal washer 51 are graphite gasket；
Second connects bearing 34 and the cross section of the 3rd connects bearing 54 are in I-shaped；
The filler that sets is the larger temperature-sensitive material of thermal coefficient of expansion, and the expansion of filler large volume is set when heated,
Packing element 74 is expanded outwardly, realization is set, when deblocking, stop heat injection, set filler contraction, realize deblocking；
The cross section of end cap becket 372 is I-shaped.
The operation principle and process of the present invention：
Refer to shown in Fig. 1, Fig. 2, Fig. 3 and Fig. 4, this heater is vertically placed in well, be passed through air and (may also be nitrogen
Gas, carbon dioxide, water or other fluid) as heat transfer medium, air (gas such as nitrogen, carbon dioxide) is passed through as cryogen,
Reduce the temperature in cable passage, drilling well work then carried out to oil shale block, and pressure break is carried out to destination layer, in well under
Enter sleeve pipe；G.I.H after the debugging of this heater, and preheat, the parameters of this heater are observed, are reached after requirement, start note
Gas and injection normal temperature air, set to packer；Monitor the parameters of this heater in real time by ground display device,
Heating rod wall surface temperature is avoided to exceed the highest tolerable temperature of heating rod；When needing to carry this heater, stop heating, continue to note
Enter air, removing seal for packer after a period of time above carries this heater.
Claims (6)
1. a kind of tandem varying pitch downhole fluid electric heater, it is characterised in that：It is by the first wire connection cavity (1), one-level heating
Device (2), the second wire connection cavity (3), secondary heater (4), the 3rd wire connection cavity (5), three-level heater (6) and packer (7) composition,
Primary heater (2), secondary heater (4) and three-level heater (6) are sequentially connected and connect, and packer (7) is arranged on three-level heating
On device (6), the first wire connection cavity (1) is arranged on primary heater (2), the second wire connection cavity (3) be arranged on primary heater (2) and
Between secondary heater (4), the 3rd wire connection cavity (5) is arranged between secondary heater (4) and three-level heater (6)；
The first cable passage (25) of the electric heater, the second cable passage (45), the 3rd cable passage (65) are by two and half
Circular pipe and central partition plate are welded, and form the passage of two closings；
First wire connection cavity (1) is soft including lifting lock ring (11), the first separate terminal enclosure (12), the first cable tube (13), the first wiring
(14), the first seal washer (15) are managed, lifting lock ring (11), which is connected through a screw thread, to be arranged on the first heating rod bearing (21),
And the first separate terminal enclosure (12) is fixed, the first separate terminal enclosure (12) is arranged on ring (11) lower end caused by lifting, and the first cable tube (13) is set
Put in the first wire connection cavity (1), and pass through the first separate terminal enclosure (12), the first cable tube (13) lower end and four the first electrically heated rods
(22) it is together by a threaded connection, (13 inner sides are connected the first cable tube with the first cable passage (25), the first cable tube
(13) top is provided with signal string holes (131) in signal wire channel side, and power line channel side is provided with power string holes (132), in
Channel inlet mouthful (133) is provided with above septum cordis plate, the first wiring flexible pipe (14) is arranged on the first cable tube (13) and the first electricity
Between heating rod (22), connected by active joint, the first seal washer (15) is arranged on the first separate terminal enclosure (12) and first shell
Between body (201), and seal the first wire connection cavity (1)；
Primary heater (2) includes the first heating rod bearing (21), the first electrically heated rod (22), the first heating rod locking nut
(23), the first heating rod sealant (24), the first cable passage (25), the first helical baffles (26), the first central tube are heat-insulated
Layer (27), the first central tube (28), first sensor hole (29), the first housing (201), the first sealing ring (202), the first heating
Rod bearing (21) is arranged on the inside of the first housing (201), is connected through a screw thread with the first housing (201), the first electrically heated rod
(22) annular is arranged on the first heating rod bearing (21), and fixed by the first heating rod locking nut (23), the first heating
Rod sealant (24) is arranged between the first electrically heated rod (22) and the first heating rod bearing (21), and is locked by the first heating rod
Nut (23) is compacted, and the upper end of the first cable passage (25) passes through the first heating rod bearing (21), and with the first cable tube (13)
It is connected, the first cable passage (25) lower end welds together with the second cable passage (45) upper end, the first central tube thermal insulation layer
(27) it is arranged between the first cable passage (25) and the first central tube (28), plays prevention heat and passed from the first central tube (28)
The effect of the first cable passage (25) is delivered to, the first central tube (28) is arranged on first central tube thermal insulation layer (27) outer shroud, passed through
The central tube of first helical baffles (26), is connected, the first central tube (28) bottom with the first helical baffles by electric welding
Together with the second central tube (48) upper weld, the first helical baffles (26) are arranged in the first housing (201), through the
One central tube (28) and the first electrically heated rod (22), are connected, first sensor hole (29) are arranged on the first central tube by being welded
(28) close to the position of the first electrically heated rod (22) afterbody, for through sensor, the first housing (201) bottom to be provided with four
Individual bolt hole, for connecting the second connecting bolt (33)；
Second wire connection cavity (3) includes the second seal washer (31), the second separate terminal enclosure (32), the second connecting bolt (33), the second company
Connect bearing (34), the second cable tube (35), the second connection flexible pipe (36), the second seal washer (37), the second seal washer (31)
It is arranged between the first housing (201) and the second connects bearing (34), is connected by the second connecting bolt (33), the second separate terminal enclosure
(32) it is arranged on the outside of the second connects bearing (34), is connected through a screw thread with the second connects bearing, the second connects bearing (34) is set
Put between the first housing (201) and the second heating rod bearing (41), connected by the second connecting bolt (33), the second connection branch
The second seal washer (31), the second line are respectively arranged between seat (34), the first housing (201) and the second heating rod bearing (41)
Cable pipe (35) lower end is connected the connection of flexible pipe (36) upper end with second, power line is hedged off from the outer world, on the second wiring flexible pipe (36)
End is connected with the second cable tube (35) lower end, and the second wiring flexible pipe (36) lower end is connected with the second electrically heated rod (42) upper end
Connect, the second sealing ring (37) is arranged between the second connects bearing (34) and the second heating rod bearing (41)；
Secondary heater (4) includes plus the second heating rod bearing (41), the second electrically heated rod (42), the second heating rod locking nut
(43), the second heating rod sealant (44), the second cable passage (45), the second helical baffles (46), the second central tube are heat-insulated
Layer (47), the second central tube (48), second sensor hole (49), the second housing (401) and the second sealing ring (402), second adds
Hot pin bearing (41) is threadedly attached in the second housing (402), has four the first heating rods on the second heating rod bearing
Hole and four the first bolts hole, and the second electrically heated rod of connection (42) and the second connecting bolt (33) are respectively used to, the second electricity adds
Hot pin (42) is arranged on the first heating rod hole of the second heating rod bearing (41), and the second heating rod locking nut (43) is arranged on
At the external screw thread of the second electrically heated rod (42) upper end, the second heating rod sealant (44) is arranged on the second electrically heated rod (42) and added
In annular space between hot pin hole, for being sealed to heating rod hole, the second cable passage (45) connect branch through second
Seat (34), is connected with the second cable tube (35), and the second cable passage (45) upper end is welded with the first cable passage (25) lower end, the
Two cable passages (45) lower end is connected with the 3rd cable passage (65) upper end, and the second helical baffles (46) are arranged on the second housing
(401) in, through the second electrically heated rod (42) and through the second central tube (48), and welded with the second central tube, to being heated
Fluid plays guide functions, and the second central tube thermal insulation layer (47) is arranged on the second cable passage (45) outer shroud, prevents heat from second
Central tube (48) is transferred to the second cable passage (45), and the second central tube (48) is arranged on the second central tube thermal insulation layer (47) outside
Ring, through the central tube of the second helical baffles (46), is welded with the second helical baffles (46), on the second central tube (48)
Portion is together with the first central tube (28) lower weld, and the second central tube (48) lower end is welded on one with the 3rd central tube upper end
Rise, second sensor hole (49) are arranged on the second central tube (48), for through sensor, the second housing (401) bottom
Four the second bolts hole are provided with, for being connected with the 3rd connecting bolt (53)；
3rd wire connection cavity (5) includes the 3rd seal washer (51), the 3rd separate terminal enclosure (52), the 3rd connecting bolt (53), the 3rd company
Connect bearing (54), the 3rd cable tube (55), the 3rd connection flexible pipe (56) and the 3rd seal washer (57), the 3rd seal washer (51)
The second housing (401) end is arranged on, and between the 3rd connects bearing (54), is connected by the 3rd connecting bolt (53), the 3rd
Separate terminal enclosure (52) is arranged on the outside of the 3rd connects bearing (54), is connected through a screw thread with the 3rd connects bearing, the 3rd connects bearing
(54) it is arranged between the second housing (401) and the 3rd heating rod bearing (61), and is connected by the 3rd connecting bolt (53), the
Three connects bearings (54) and the second housing (401) are provided with the 3rd seal washer between the 3rd heating rod bearing (61) respectively
(51), the 3rd cable tube (55) lower end is connected the connection of flexible pipe (56) upper end with the 3rd, and power line is hedged off from the outer world, the 3rd wiring
Flexible pipe (56) upper end is connected with the 3rd cable tube (55) lower end, the 3rd wiring flexible pipe (56) lower end and the 3rd electrically heated rod (62)
Upper end is connected, and the 3rd sealing ring (57) is arranged between the 3rd connects bearing (54) and the 3rd heating rod bearing (61)；
Three-level heater (6) includes plus the 3rd heating rod bearing (61), the 3rd electrically heated rod (62), the 3rd heating rod locking nut
(63), the 3rd heating rod sealant (64), the 3rd cable passage (65), the 3rd helical baffles (66), the 3rd central tube are heat-insulated
Layer (67), the 3rd central tube (68), 3rd sensor hole (691), the first check valve (692), the 3rd housing (601), the 3rd close
Seal (602), the 3rd heating rod bearing (61) is arranged in the 3rd housing (601), and is connected by screw thread, the 3rd heating rod
There are four the 3rd heating rod holes and four the 3rd bolts hole on bearing, spiral shell is connected with the 3rd electrically heated rod (62) and the 3rd respectively
Bolt (63) is engaged, and the 3rd electrically heated rod (62) is arranged on the 3rd heating rod hole of the 3rd heating rod bearing (61), and the 3rd adds
Hot pin locking nut (63) is arranged at the external screw thread of the 3rd electrically heated rod (62) upper end, and the 3rd heating rod sealant (64) is set
In annular space between the 3rd electrically heated rod (62) and the 3rd heating rod hole, for being sealed to the 3rd heating rod hole,
3rd cable passage (65) is connected through the 3rd connects bearing (64) with the 3rd cable tube, the 3rd cable passage (65) upper end and the
Two cable passages (35) lower end is welded, and the 3rd helical baffles (66) are arranged in the 3rd housing (601), through the 3rd electrical heating
Rod (62) and the 3rd central tube (68), and weld together with the 3rd central tube (68), guide functions are played to added hot fluid, the
Three central tube thermal insulation layers (67) are arranged on the 3rd cable passage (65) outer shroud, prevent heat to be transferred to from the 3rd central tube (68)
Three cable passages (65), the 3rd central tube (68) is arranged on the 3rd central tube thermal insulation layer (67) outer shroud, through the 3rd spiral baffling
The central tube of plate (66), is welded with the 3rd helical baffles (66), the 3rd central tube (68) upper end and the second central tube (48)
Lower end welds together, and 3rd sensor hole (69) are arranged on the 3rd central tube (68), for unidirectional through sensor, first
Valve (692) is arranged on the bottom of the 3rd central tube (68), and the 3rd housing (601) bottom is provided with four the 3rd bolts hole, and
It is connected with one-way valve seat (72)；
Packer (7) include connecting bolt (71), check valve (72), upper end cover (73), packing element (74), packerfoot (75),
Filler (76), thermometal ring (77), bottom end cover (78) are set, upper end cover (73) is identical with bottom end cover (78) structure；
Upper end cover (73) includes end cap set (731), end cap becket (732), upper end cover set (733), end cover connecting bolt
(734)；
End cap becket (732) is arranged between end cap set (731) and upper end cover set (733), end cap set (731) and upper end cover set
(733) connected between by end cover connecting bolt (734)；
Connecting bolt (71) is used to connect check valve (72) and the 3rd housing (601) bottom, check valve (72) upper end and the 3rd shell
Body (601) bottom is connected by connecting bolt (71), and check valve (72) lower end is connected with packerfoot (75), upper end cover
(73) packerfoot top is placed in, is connected through a screw thread, packing element (74) is placed between upper end cover (73) and bottom end cover (78), glue
Thermometal ring is provided with the outside of cylinder (74), packerfoot (75) upper end is connected with check valve (72) lower end, packerfoot
(75) lower end is connected with bottom end cover, sets the annular space that filler (76) is arranged between packerfoot (75) and packing element (74),
Thermometal ring (77) is placed on the outside of packing element (74), and bottom end cover (78) is arranged on the lower end of packerfoot (75).
2. a kind of tandem varying pitch downhole fluid electric heater according to claims, it is characterised in that：Described
One heating rod bearing (21), the second heating rod bearing (41), the 3rd heating rod bearing (61) are involute bearing, the first housing
(201), the second housing (401), the 3rd housing (601) are tapering type bearing.
3. a kind of tandem varying pitch downhole fluid electric heater according to claims, it is characterised in that：Described
One seal washer (15), the second seal washer (31) and the 3rd seal washer (51) are graphite gasket.
4. a kind of tandem varying pitch downhole fluid electric heater according to claims, it is characterised in that：Described
Two connects bearings (34) and the 3rd connects bearing (54) cross section are in I-shaped；End cap becket (372) cross section is work
Font.
5. a kind of tandem varying pitch downhole fluid electric heater according to claims, it is characterised in that：Described
One electrically heated rod (22), the second electrically heated rod (42), the 3rd electrically heated rod (62) are screw tube type electrically heated rod, and its outer surface has
Shape of threads projection.
6. a kind of tandem varying pitch downhole fluid electric heater according to claims, it is characterised in that：Described
First helical baffles (26), the second helical baffles (46) and the 3rd helical baffles (66) are continuous helical deflecting plate, are adopted
Three-level pitch is used, the pitch of the first helical baffles (26) is maximum, and the pitch of the second helical baffles (46) is taken second place, the 3rd spiral
The pitch of deflection plate (66) is minimum.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710665057.7A CN107288583B (en) | 2017-08-07 | 2017-08-07 | Series-type variable pitch downhole fluid electric heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710665057.7A CN107288583B (en) | 2017-08-07 | 2017-08-07 | Series-type variable pitch downhole fluid electric heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107288583A true CN107288583A (en) | 2017-10-24 |
| CN107288583B CN107288583B (en) | 2023-04-07 |
Family
ID=60104802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710665057.7A Active CN107288583B (en) | 2017-08-07 | 2017-08-07 | Series-type variable pitch downhole fluid electric heater |
Country Status (1)
| Country | Link |
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| CN (1) | CN107288583B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343415A (en) * | 2018-04-20 | 2018-07-31 | 吉林大学 | A kind of underground vortex heater |
| CN108505971A (en) * | 2018-04-20 | 2018-09-07 | 吉林大学 | A kind of downhole fluid electric heater |
| CN112324390A (en) * | 2020-10-30 | 2021-02-05 | 陕西惠泽热能有限公司 | Wax deposition prevention device for petroleum production well |
| CN114810017A (en) * | 2022-03-28 | 2022-07-29 | 吉林大学 | Underground composite heater for underground mineral in-situ development |
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| US20040244982A1 (en) * | 2002-08-15 | 2004-12-09 | Chitwood James E. | Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons |
| US20080002954A1 (en) * | 2002-07-22 | 2008-01-03 | Carr Michael R Sr | Inline downhole heater |
| US20090166032A1 (en) * | 2004-07-07 | 2009-07-02 | Carr Sr Michael Ray | Inline Downhole Heater and Methods of Use |
| CN106304446A (en) * | 2016-10-14 | 2017-01-04 | 吉林大学 | A kind of borehole fluid electric heater |
| CN207093039U (en) * | 2017-08-07 | 2018-03-13 | 吉林大学 | A kind of tandem varying pitch downhole fluid electric heater |
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|---|---|---|---|---|
| GB726091A (en) * | 1953-03-03 | 1955-03-16 | Thermactor Company | Improvements in electric heater for subterranean fluid reservoirs |
| US20080002954A1 (en) * | 2002-07-22 | 2008-01-03 | Carr Michael R Sr | Inline downhole heater |
| US20040244982A1 (en) * | 2002-08-15 | 2004-12-09 | Chitwood James E. | Substantially neutrally buoyant and positively buoyant electrically heated flowlines for production of subsea hydrocarbons |
| US20090166032A1 (en) * | 2004-07-07 | 2009-07-02 | Carr Sr Michael Ray | Inline Downhole Heater and Methods of Use |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108343415A (en) * | 2018-04-20 | 2018-07-31 | 吉林大学 | A kind of underground vortex heater |
| CN108505971A (en) * | 2018-04-20 | 2018-09-07 | 吉林大学 | A kind of downhole fluid electric heater |
| CN108505971B (en) * | 2018-04-20 | 2023-09-22 | 吉林大学 | Downhole fluid electric heater |
| CN108343415B (en) * | 2018-04-20 | 2023-09-22 | 吉林大学 | Underground vortex heater |
| CN112324390A (en) * | 2020-10-30 | 2021-02-05 | 陕西惠泽热能有限公司 | Wax deposition prevention device for petroleum production well |
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| CN114810017A (en) * | 2022-03-28 | 2022-07-29 | 吉林大学 | Underground composite heater for underground mineral in-situ development |
| CN114810017B (en) * | 2022-03-28 | 2023-10-20 | 吉林大学 | Underground composite heater for in-situ development of underground mineral products |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107288583B (en) | 2023-04-07 |
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