CN110145287A - A kind of compound oil extraction system of heavy oil heating viscosity reduction - Google Patents
A kind of compound oil extraction system of heavy oil heating viscosity reduction Download PDFInfo
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- CN110145287A CN110145287A CN201910479000.7A CN201910479000A CN110145287A CN 110145287 A CN110145287 A CN 110145287A CN 201910479000 A CN201910479000 A CN 201910479000A CN 110145287 A CN110145287 A CN 110145287A
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- 239000003921 oil Substances 0.000 title claims abstract description 129
- 238000010438 heat treatment Methods 0.000 title claims abstract description 94
- 239000000295 fuel oil Substances 0.000 title claims abstract description 23
- 238000000605 extraction Methods 0.000 title claims abstract description 21
- 150000001875 compounds Chemical class 0.000 title claims abstract description 19
- 238000011084 recovery Methods 0.000 claims abstract description 39
- 238000002347 injection Methods 0.000 claims abstract description 24
- 239000007924 injection Substances 0.000 claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000005065 mining Methods 0.000 claims abstract description 8
- 210000003781 tooth socket Anatomy 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 3
- 230000037431 insertion Effects 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 239000005439 thermosphere Substances 0.000 claims 1
- 239000010779 crude oil Substances 0.000 abstract description 17
- 238000000034 method Methods 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 abstract description 8
- 230000007423 decrease Effects 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 13
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005485 electric heating Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000003129 oil well Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 229920002620 polyvinyl fluoride Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002633 protecting effect Effects 0.000 description 1
- 230000005855 radiation Effects 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
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/023—Arrangements for connecting cables or wirelines to downhole devices
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/04—Couplings; joints between rod or the like and bit or between rod and rod or the like
- E21B17/042—Threaded
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/166—Injecting a gaseous medium; Injecting a gaseous medium and a liquid medium
- E21B43/168—Injecting a gaseous medium
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
- E21B43/24—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection
- E21B43/2401—Enhanced recovery methods for obtaining hydrocarbons using heat, e.g. steam injection by means of electricity
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Resistance Heating (AREA)
- Earth Drilling (AREA)
Abstract
The invention discloses a kind of compound oil extraction systems of heavy oil heating viscosity reduction, including producing well column, surface mining system；The surface mining system includes production tree, producing well, gas injection device, power supply unit；The producing well column includes gas injection pipeline, oil pipe section, casing；Annular space is formed between described sleeve pipe and oil pipe section, annular space top is connected to gas injection device by gas injection pipeline；The oil pipe section is formed by connecting by more thickened oil recovery oil pipes.The thickened oil recovery tube inner wall is equipped with composite heating pipe, and composite heating pipe is respectively equipped with wear-resistant liner and heating layer from inside to outside.The present invention keeps crude oil temperature in lifting process not reduce, there are certain annular spaces between oil pipe and casing, thinner can be filled by this annular space, further decrease crude oil formation viscosity, improve crude oil formation mobility, the safety and stability of downhole cable can be effectively improved, while not influencing the structure of oil channel, in the case where ensureing electric cable heating, the oil recovery efficiency of oil pipe is improved.
Description
Technical field
The present invention relates to the Technology of Heavy Oil Recovery field, specifically a kind of compound oil extraction system of heavy oil heating viscosity reduction.
Background technique
Petroleum industry is the basis of modern energy chemical industry supply, thick with gradually decreasing for conventional light petroleum resources
Oily resource will play very important effect in future world energy supply.Viscous crude is the biggish crude oil of viscosity, thick exploiting
It when oily, needs to take viscosity reduction measure, to reduce the viscosity of viscous crude, enhances its mobility.The usual viscosity reduction measure includes: to burn
Oil reservoir, chemical viscosity reduction, mixes dilute technique etc. at steam soak.In particular, for the viscous crude of ultradeep well, due to deeply buried reservoir
Degree is more than 5000m, and formation temperature is up to 130 degrees Celsius or more, and therefore, crude oil has preferable mobility in reservoir.But
It is that crude oil enters after pit shaft during flowing to the ground, as close to ground, temperature in wellbore is reduced, and the viscosity of viscous crude is therewith
Increase, mobility will be gradually lost, therefore, it is difficult to pass through traditional approach exploitation to earth's surface.And it described mix dilute technique and is mainly used in
Crude oil is since heat loss is than more serious in pit shaft during lifting to the ground, and with the reduction of temperature, viscosity of crude increases
And the oil well of mobility is gradually lost, and crude oil can also be solidified in wax deposition.Dilute technique is mixed mainly to mix in viscous crude
Thin oil can reduce pit shaft Central Plains oil viscosity after mixing low-density thin oil in viscous crude；Simultaneously when low-density thin oil and ground
Density is less than former viscous crude density after layer viscous crude mixing, can reduce pit shaft head of liquid, increase producing pressure differential, so as to effective
Viscous crude is lifted extraction pit shaft by ground.Also have and glutinous technology is dropped using heating in crude oil extraction on thick well, glutinous skill drops in existing heating
Technology that there are many arts, steam-heated method is mainly used, hot gas injection method is usually used: injecting from well head to underground and infuses
Enter hot steam, according to hole condition, the temperature of hot steam is heated in 200-400 degree by heavy oil tested layer of the hot steam to underground,
After stewing well diffusion, temperature decline, the problem is that: first, since the vapor (steam) temperature of injection is high, to environment, personnel
Required with equipment it is higher, second, due at earth's surface inject steam, by well depth at 1000-3000 meters, even more deeply, this
In the process of moving, temperature will decline sample, and when passing through heavy oil tested layer, temperature further declines, this will generate well head pressure
Height is unfavorable for kill-job, to be easy to cause gusher, and then serious accident occurs；Third, since there are three types of sides for hot transmitting
Formula: conduction, convection current and radiation, since well depth is at 1000-3000 meters, in this way, the temperature of well head is high, the temperature at heavy oil tested layer
It is low, conduction heating is only existed, in this way, the thermal efficiency is low.
In view of the above-mentioned problems, thering is part related personnel to develop corresponding scheme, in Publication No. 203223214U
State's patent, provides a kind of mode of electric cable heating, but its method be for coiled tubing, and at present scene for cost etc. because
Element, the multiple-tubing string being much still link together, and in this case, using electric cable heating, electricity are laid in oil pipe
Cable, and need to guarantee the efficiency and stability of the work of cable, especially safety, be it is extremely difficult, cable itself is easy
High temperature and pressure height friction under damage, the Chinese patent of Publication No. 108119114 provide a kind of pair of cable itself into
Row reinforces the scheme thickeied, and but its structure is complex, with high costs, and is affected to runner, and live practical value is limited.
Summary of the invention
In view of the above-mentioned problems, keeping crude oil it is an object of the present invention to provide a kind of compound oil extraction system of heavy oil heating viscosity reduction
Temperature does not reduce in lifting process, and there are certain annular spaces between oil pipe and casing, thinner can be filled by this annular space, into one
Step reduces crude oil formation viscosity, improves crude oil formation mobility, can effectively improve the safety and stability of downhole cable, together
When do not influence the structure of oil channel and improve the oil recovery efficiency of oil pipe in the case where ensureing electric cable heating.
Technical scheme is as follows:
A kind of compound oil extraction system of heavy oil heating viscosity reduction, including producing well column, surface mining system；
The surface mining system includes production tree, producing well, gas injection device, power supply unit；
The producing well column includes gas injection pipeline, oil pipe section, casing；Annular space, ring are formed between described sleeve pipe and oil pipe section
Empty top is connected to gas injection device by gas injection pipeline；
The oil pipe section is formed by connecting by more thickened oil recovery oil pipes, and every thickened oil recovery tubing length is 8-12m, viscous crude
Production tubing internal diameter is 62-88.6mm；
The thickened oil recovery tube inner wall is equipped with composite heating pipe, and composite heating pipe is respectively equipped with wear-resistant liner from inside to outside
And heating layer, heating layer inside are equipped with cable, cable includes upper cable and subjacent cable, and middle part is heating cable, top
The upper cable of thickened oil recovery oil pipe be connected to power supply unit.
Further, thickened oil recovery oil pipe top is box thread connector, and lower part is male thread connector, box thread connector
Butt end is equipped with the radial outside of male thread connector；
The radial outside butt end of box thread connector is equipped with two sections of symmetrically arranged arc grooves, is equipped with connection in arc groove
Block, link block are connected to heating layer lower section by subjacent cable；
The radial outside butt end of male thread connector is equipped with two sections of symmetrically arranged link slots, and link slot is arcuate structure,
Its radian is greater than the arc groove, and receiving sheet is equipped in link slot, and receiving sheet is connected on heating layer by upper cable
Section.
Further, link block fixinig plate is additionally provided between the link block and subjacent cable.
Further, link block fixinig plate bottom is equipped with multiple tooth sockets, is equipped with multiple rack gears at the top of the link block,
Rack gear corresponds to tooth socket, and the link block and arc groove are interference fitted, and is caught in arc groove and fixes rack gear insertion tooth socket deeply.
Further, receiving sheet is installed, receiving sheet thickness is less than connection groove depth in the link slot.
Further, the link block bottom width is less than top, and link block bottom is flush configuration, and front and back end is
Arcuate structure, link block are copper billet, and the depth of the prominent arc groove in link block bottom is slightly larger than the depth after link slot installation receiving sheet
Degree.
Further, 4 side of receiving sheet side and link slot are equipped with gap, are equipped with supporting block, supporting block in gap
Height slightly larger than link slot installation receiving sheet after depth.
Further, heating cable is equipped in the heating layer, heating cable is equipped with two, is wrapped in by double-spiral structure
Oil pipe inner body wall, two are connected to subjacent cable after upper cable access from top to bottom.
Further, in heating layer bottom, on the inside of male thread connector, heating cable be divided into it is two layers inside and outside, internal layer
After heating cable laying to bottom, by winding the heating cable connection of outer layer of the laying lower part relatively top to position upwards
Cable.
Further, the wear-resistant liner is tightly attached to heating layer inner wall, is equipped in the axial direction of wear-resistant liner outer wall multiple
Supporting block, the supporting block push against at the top of supporting block with oil pipe inner body wall, the gap between supporting block along being axially gear-like
It is passed through for heating cable.
Further, in the oil pipe section, the thickened oil recovery oil pipe of bottommost is no longer equipped with subjacent cable, heats cable
After the entrance of the upper cable at top, spiral drops to the heating cable of bottom and remains one layer, and connects in parallel in bottommost
It is connected to the upper cable of opposite side and spiral to the other side.
The beneficial effects of the present invention are:
1, the present invention provides a kind of compound oil extraction system of heavy oil heating viscosity reduction, is suitable for thickened oil recovery, sets inside oil pipe
There is wear-resistant liner, heating layer is equipped between oil pipe and wear-resistant liner, plays insulation effect.Wear-resistant liner can bear the height in oil well
Pressure, and have good protecting effect to heating layer.Wear-resistant liner and heating layer also act as electrical exhausted other than playing heat insulation effect
The effect of edge；
2, the present invention uses various ways compound action, using heating and injection nitrogen, fills the various modes such as thinner,
Crude oil is improved in the mobility on stratum.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that heavy oil heating viscosity reduction of the present invention meets oil extraction system；
Fig. 2 is the front sectional view of oil pipe provided by the present invention；
Fig. 3 is the detail view of a-quadrant in Fig. 2；
Fig. 4 is the detail view of B area in Fig. 2；
Fig. 5 is the detail view in the region C in Fig. 2；
Fig. 6 is the detail view in the region D in Fig. 2；
Fig. 7 is the top view of oil pipe provided by the present invention；
Fig. 8 is the bottom view of oil pipe provided by the present invention；
Fig. 9 be Fig. 8 in the region oil pipe E with correspondence oil pipe contact after contact face structure schematic diagram；
Figure 10 is the bottom substance schematic diagram of the thickened oil recovery oil pipe of bottommost；
Figure 11 is supporting block part axial section.
In figure:
1 thickened oil recovery oil pipe, 2 casings, 3 gas injection devices, 4 gas injection pipelines, 5 power supply units, 6 annular spaces, 7 oil recovery runners；
101 oil pipe ontologies, 102 heating layers, 1021 heating cables, 103 wear-resistant liners, 1031 supporting blocks, 104 gaskets
Circle, 105 upper cables, 106 subjacent cables, 107 link slots, 108 receiving sheets, 109 sealing blocks, 1010 link block fixinig plates,
1011 link blocks, 1012 are refractory seals glue.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, a kind of compound oil extraction system of heavy oil heating viscosity reduction, including producing well column, surface mining system；It is described
Surface mining system includes production tree, producing well, gas injection device 3, power supply unit 5；The producing well column include gas injection pipeline 4,
Oil pipe section, casing 2；Annular space 6 is formed between described sleeve pipe 2 and oil pipe section, is passed through gas injection pipeline 4 at the top of annular space 6 and is connected to gas injection
Device 3, gas injection device 3 can also fill thinner, have annular space between oil pipe and casing 2, can be filled by this annular space
Thinner reduces the viscosity of crude oil in the earth formation, improves crude oil in the mobility on stratum；Nitrogen can also be injected by this annular space
The high stratum energy of air lift, oil pipe section middle part is oil recovery runner 7.
The oil pipe section is formed by connecting by more thickened oil recovery oil pipes 1, and every 1 length of thickened oil recovery oil pipe is 8-12m, thick
Oily 1 internal diameter of production tubing is 62-88.6mm, and 1 wall thickness of thickened oil recovery oil pipe is 6-10mm.As shown in Fig. 2, the thickened oil recovery oil
1 inner wall of pipe is equipped with composite heating pipe, and composite heating pipe is respectively equipped with wear-resistant liner 103 and heating layer 102 from inside to outside, heats
102 inside of layer is equipped with cable, and cable includes upper cable 105 and subjacent cable 106, and middle part is heating cable 1021, top
The upper cable 105 of thickened oil recovery oil pipe 1 be connected to power supply unit 5.
On the composite heating pipe top of each thickened oil recovery oil pipe 1, also settable seal washer 104, seal washer
104 be refractory seals washer.
The heating layer 102 with a thickness of 1.35mm, heating layer 102 includes nano-high molecule insulating layer and heating cable
1021, nano-high molecule insulating layer is a kind of nanometer of high density polyurethane, apparent density >=0.4g/cm3, heatproof is greater than 200 DEG C.
Resistance to compression is greater than 13Mpa.Thermal coefficient is less than 0.05W/m.k.Anti- insulating capacity >=3Kv/1mm.The heating cable 1021 is one
Kind Aludirome, diameter 0.3mm.There is insulating materials resistant to high temperature outside electric heating wire, insulating materials is polyvinyl fluoride.
The wear-resistant liner 103 is nanometer modified epoxy resin, with a thickness of 1mm.
As shown in figs. 2-9,1 top of thickened oil recovery oil pipe is box thread connector, and lower part is male thread connector, box thread
The radial outside of connector and male thread connector is equipped with butt end；The radial outside butt end of box thread connector is equipped with two sections symmetrically
The arc groove of setting, link block 1011 is equipped in arc groove, and link block 1011 is connected to heating layer by subjacent cable 106
102 lower sections；The radial outside butt end of male thread connector is equipped with two sections of symmetrically arranged link slots 107, and link slot 107 is arc
Shape structure, receiving sheet 108 is equipped in link slot 107, and receiving sheet 108 is connected on heating layer 102 by upper cable 105
Section；The upper cable 105 and subjacent cable 106 are all the holes by processing L type on oil pipe ontology 101, are put into peace
Dress, the hole of L-type is formed from the butt end of oil pipe ontology 101 and 101 inner wall drilling processing of oil pipe ontology respectively.The link block
1011 fixinig plate 1010 of link block is additionally provided between 1011 and subjacent cable 106.Receiving sheet is installed in the link slot 107
108,108 thickness of receiving sheet is less than 107 depth of link slot.1011 bottom width of link block is less than top, and link block
1011 bottoms are flush configuration, and front and back end is arcuate structure, and link block 1011 is copper billet, the prominent arc in 1011 bottom of link block
The depth of slot installs the depth after receiving sheet 108, such as 1mm, it is ensured that link block 1011 can be fitted to and be held slightly larger than link slot 107
In contact pin 108 and transmit electric energy；
Further, as shown in figure 11,1011 fixinig plate of link block, 1010 bottom is equipped with multiple tooth sockets, the connection
Multiple rack gears are equipped at the top of block 1011, rack gear corresponds to tooth socket, and the link block 1011 is interference fitted with arc groove, is caught in arc groove
And fix rack gear insertion tooth socket deeply.Be designed in this way, it can be ensured that 1011 fixinig plate 1010 of link block and link block 1011 it
Between installation it is more stable, it is ensured that power supply is smooth.
Further, it as shown in figure 3,108 side of the receiving sheet, 4 side and link slot 107 are equipped with gap, is installed in gap
There is supporting block 1031, the height of supporting block 1031 installs the depth after receiving sheet 108, such as 2mm, support slightly larger than link slot 107
Block 1031 is refractory seals block 109, and material can press from both sides metal using soft graphite, have certain elasticity, can be in two viscous crude
Production tubing 1 compresses after connecting, it is ensured that link slot 107 and external sealing avoid the influence of outer bound pair circuit.
As Figure 7-8, the radian of link slot 107 is greater than the arc groove, if link slot 107 is 45 °, aforementioned arc groove
It is 10 °, and when designing male thread connector and box thread connector, it is ensured that before two thickened oil recovery oil pipes 1 screw, even
Link slot 107 can be screwed in by connecing block 1011, and when screwing, and link block 1011 can push against the receiving sheet 108 of link slot 107, and
The end of link slot 107 is not bumped against,
As seen in figures 3-6, heating cable 1021, the heating in each thickened oil recovery oil pipe 1 are equipped in the heating layer 102
Cable 1021 is designed with two, snakelike to be wrapped in 101 inner wall of oil pipe ontology by double-spiral structure, and two from upper cable 105
Subjacent cable 106 is connected to after access from top to bottom.In 102 bottom of heating layer, on the inside of male thread connector, cable is heated
1021 points are inside and outside two layers, after the heating cable 1021 of internal layer is routed to bottom, the heating of the outer layer by winding laying upwards
Cable 1021 is connected to the relatively top subjacent cable 106 in position.The wear-resistant liner 103 is tightly attached to 102 inner wall of heating layer,
Multiple supporting blocks 1031 are equipped in the axial direction of 103 outer wall of wear-resistant liner, the supporting block 1031 is along axial for gear-like, support
1031 top of block is pushed against with 101 inner wall of oil pipe ontology, and the gap between supporting block 1031 is passed through for heating cable 1021.
As shown in Figure 10, in the oil pipe section, the thickened oil recovery oil pipe 1 of bottommost is no longer equipped with subjacent cable 106, adds
After the entrance of the upper cable 105 at top, spiral drops to the heating cable 1021 of bottom and remains one layer electric heating cable 1021,
And it is attached in parallel to the upper cable 105 of opposite side and spiral to the other side in bottommost, in the thickened oil recovery oil of bottommost
The heating layer 102 of pipe 1 and 103 bottom of wear-resistant liner are equipped with refractory seals glue 1012, it is ensured that 102 the operation is stable of heating layer.
Working condition of the invention is as follows:
As shown in Figure 1, when carrying out thickened oil recovery using system, thickened oil recovery that power supply unit 5 passes through top
The upper cable 105 of oil pipe 1, send electric power into heating cable 1021, and it is thick then to sequentially enter next stage by subjacent cable 106
Oily production tubing 1, until the thickened oil recovery oil pipe 1 of bottommost, the heating cable 1021 of the thickened oil recovery oil pipe 1 of bottommost from
It is upper and under, then bottommost from bottom to top, expire the thickened oil recovery oil pipe of upper level from the connection of the upper cable 105 of its other side
1 another subjacent cable 106, and upwards in turn, another upper cable 105 of the thickened oil recovery oil pipe 1 until returning to top,
And power supply unit 5 is returned to, heater circuit circuit is formed, to realize the continuous heating to underground.When needed, can also lead to
Injection nitrogen is crossed, or the mode of thinner is added, further decreases crude oil formation viscosity, improves crude oil formation mobility, mentions
High production efficiency.
The power supply unit 5, gas injection device 3 are the available mature scheme of the prior art.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (10)
1. a kind of compound oil extraction system of heavy oil heating viscosity reduction, including producing well column, surface mining system；
The surface mining system includes production tree, producing well, gas injection device, power supply unit；
The producing well column includes gas injection pipeline, oil pipe section, casing；Annular space, annular space top are formed between described sleeve pipe and oil pipe section
Portion is connected to gas injection device by gas injection pipeline；
It is characterized in that, the oil pipe section is formed by connecting by more thickened oil recovery oil pipes, every thickened oil recovery tubing length is 8-
12m, thickened oil recovery pipe aperture are 62-88.6mm；
The thickened oil recovery tube inner wall is equipped with composite heating pipe, and composite heating pipe is respectively equipped with wear-resistant liner from inside to outside and adds
Thermosphere, is equipped with cable inside heating layer, and cable includes upper cable and subjacent cable, and middle part is heating cable, top it is thick
The upper cable of oily production tubing is connected to power supply unit.
2. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 1, which is characterized in that the thickened oil recovery
Oil pipe top is box thread connector, and lower part is male thread connector, and the radial outside of box thread connector and male thread connector is equipped with
Butt end；
The radial outside butt end of box thread connector is equipped with two sections of symmetrically arranged arc grooves, is equipped with link block in arc groove,
Link block is connected to heating layer lower section by subjacent cable；
The radial outside butt end of male thread connector is equipped with two sections of symmetrically arranged link slots, and link slot is arcuate structure, arc
Degree is greater than the arc groove, and receiving sheet is equipped in link slot, and receiving sheet is connected to heating layer upper section by upper cable.
3. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 2, which is characterized in that the link block with
Link block fixinig plate is additionally provided between subjacent cable；
Link block fixinig plate bottom is equipped with multiple tooth sockets, is equipped with multiple rack gears at the top of the link block, and rack gear corresponds to tooth socket,
The link block and arc groove are interference fitted, and are caught in arc groove and are fixed rack gear insertion tooth socket deeply.
4. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 3, which is characterized in that in the link slot
Receiving sheet is installed, receiving sheet thickness is less than connection groove depth.
5. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 3, which is characterized in that the link block bottom
Portion's width is less than top, and link block bottom is flush configuration, and front and back end is arcuate structure, and link block is copper billet, link block
The depth of the prominent arc groove in bottom is slightly larger than the depth after link slot installation receiving sheet.
6. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 5, which is characterized in that the receiving sheet side
4 side of face and link slot are equipped with gap, supporting block are equipped in gap, after the height of supporting block is slightly larger than link slot installation receiving sheet
Depth.
7. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 2, which is characterized in that in the heating layer
Equipped with heating cable, heating cable is equipped with two, is wrapped in oil pipe inner body wall by double-spiral structure, two connect from upper cable
Subjacent cable is connected to after entering from top to bottom.
8. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 4 or 6 or 7, which is characterized in that heating
Layer bottom, on the inside of the male thread connector, heating cable is divided into two layers inside and outside, after the heating cable laying to bottom of internal layer, leads to
Cross the heating cable connection for the outer layer that winding the is laid with upwards subjacent cable relatively top to position.
9. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 8, which is characterized in that the wear-resistant liner
It is tightly attached to heating layer inner wall, multiple supporting blocks is equipped in the axial direction of wear-resistant liner outer wall, the supporting block is along axial for gear
Shape, supporting block top are pushed against with oil pipe inner body wall, and the gap between supporting block is passed through for heating cable.
10. a kind of compound oil extraction system of heavy oil heating viscosity reduction according to claim 9, which is characterized in that the oil pipe section
In, the thickened oil recovery oil pipe of bottommost is no longer equipped with subjacent cable, and heating cable is after the entrance of the upper cable at top, spiral
Drop to the heating cable of bottom and remain one layer, and is attached in parallel to opposite side in bottommost and spiral is to the other side
Upper cable.
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