CN105275406B - Heat-insulated completion system and heat-insulated completion method - Google Patents
Heat-insulated completion system and heat-insulated completion method Download PDFInfo
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- CN105275406B CN105275406B CN201410276147.3A CN201410276147A CN105275406B CN 105275406 B CN105275406 B CN 105275406B CN 201410276147 A CN201410276147 A CN 201410276147A CN 105275406 B CN105275406 B CN 105275406B
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Abstract
The present invention relates to a kind of heat-insulated completion system and heat-insulated completion method.The heat-insulated completion system, including outer tube, the outer tube includes thermal insulation areas and make-up area adjacent with thermal insulation areas and in thermal insulation areas downstream in its upstream portion, the inner sleeve being arranged in outer tube, inner sleeve includes the make-up fitting area coordinated with make-up area in portion downstream and the heat-insulated fitting area in make-up fitting area upstream, after inner sleeve is installed in outer tube, make-up fitting area is engaged with make-up area, and continuous heat-insulation chamber is formed between heat-insulated fitting area and thermal insulation areas.The good heat-insulation effect of this heat-insulated completion system, and be easily changed.
Description
Technical field
The present invention relates to Oil/gas Well field, more particularly to a kind of heat-insulated completion system.The invention further relates to using it is this every
The method that hot completion system is thermally shielded completion.
Background technology
Geothermal exploitation and thick oil thermal extraction usually require to inject steam into pit shaft, this require pit shaft have preferably every
Thermal effect.Heat-insulated preferably pit shaft can reduce steam quality and heat that thermal loss of the steam along well bore wall ensures injection stratum
Enthalpy, improve thermal recovery effect.The relation of research recovery ratio and shaft bottom mass dryness fraction can be seen that：Higher recovery ratio is obtained, shaft bottom is steamed
Vapour mass dryness fraction will be maintained at more than 40%.
Current thermally insulating the borehole device, which can summarize, is divided into two classes：One kind is that oil pipe is heat-insulated；One kind is that sleeve pipe is heat-insulated.For this
A little thermally insulating the borehole devices, due to box cupling be present, after the steam soak of excessive round, effect of heat insulation can be deteriorated, and heat loss is tight
Weight.
Therefore, it is necessary to a kind of heat-insulated completion system of effect of heat insulation well.
The content of the invention
In view of the above-mentioned problems, the present invention proposes a kind of heat-insulated completion system.The effect of heat insulation of this heat-insulated completion system
It is good, and be easily changed.The invention further relates to the method for being thermally shielded completion using this heat-insulated completion system.
According to the first aspect of the invention, it is proposed that a kind of heat-insulated completion system, including：Outer tube, the outer tube include
Thermal insulation areas and make-up area adjacent with thermal insulation areas and in thermal insulation areas downstream in its upstream portion, are arranged on interior in outer tube
Sleeve pipe, inner sleeve include the make-up fitting area coordinated with make-up area in portion downstream and in make-up fitting area upstream every
Hot fitting area, after inner sleeve is installed in outer tube, make-up fitting area engages with make-up area, heat-insulated fitting area with it is heat-insulated
Continuous heat-insulation chamber is formed between area.
The apparatus according to the invention, only by the heat-insulation chamber that cooperatively forms of outer tube and inner sleeve, and heat-insulation chamber is connects
It is continuous.This heat-insulation chamber causes the heat in inner sleeve to have to pass through heat-insulation chamber conduction, without other heat transfer elements, substantially reduces
Heat in inner sleeve outwards conducts, and reduces thermal loss.After the steam soak of excessive round, heat-insulation chamber will not be sent out
Raw any change, therefore heat-insulated completion system can still keep good effect of heat insulation.In addition, the heat-insulated completion system bag of the present invention
The part included is less, and manufacturing cost is low, and use is also relatively simple.After oil well is scrapped, inner sleeve can also be taken out to repeat
Utilize, it is cost-effective, it equally also can easily change inner sleeve.
In one embodiment, it is provided with the inner surface of thermal insulation areas and/or on the outer surface of heat-insulated fitting area hot anti-
Penetrate layer.In a preferred embodiment, heat-reflecting layer is by the inner surface of thermal insulation areas and/or on the outer surface of heat-insulated fitting area
Silvering, aluminium coat, one or more formation in zinc coating and aluminium foil.The brightness of this heat-reflecting layer is very high, drops significantly
The blackness of the outer surface of the low inner surface of thermal insulation areas and/or heat-insulated fitting area, so as to reduce heat radiation, and then is substantially reduced
Heat in inner sleeve outwards conducts, and reduces thermal loss.
In one embodiment, the internal diameter of thermal insulation areas is more than the internal diameter in make-up area, and the external diameter of heat-insulated fitting area is less than make-up
The external diameter of fitting area, make-up fitting area are connected with make-up area by screw thread.Threaded connection easily can rotate inner sleeve in well head
Make-up fitting area, is connected by pipe so as to realize with make-up area.In addition, the turnning circle by calculating inner sleeve, can determine pair
Whether button fitting area reaches the predetermined degree that is connected firmly with make-up area, facilitates construction.
In one embodiment, it is provided with centralizer at the heat-insulated fitting area of inner sleeve.By this structure, by
After sleeve pipe is assembled to the inside of outer tube, centralizer can be present in inside heat-insulation chamber so that inner sleeve is placed in the middle in outer tube, side
Just subsequent work progress.In a preferred embodiment, centralizer is nonmetallic centralizer, to reduce heat transfer.
In one embodiment, outer tube also include in make-up area downstream installing zone, inner sleeve also include in pair
The installation fitting area in fitting area downstream is detained, after inner sleeve is installed in outer tube, installing zone connects with installation fitting area
Close.By setting installing zone on outer tube, installation fitting area is set on inner sleeve so that between outer tube and inner sleeve not
But it is connected with each other, is also connected with each other by installing zone and installation fitting area so that inner sleeve by make-up area and make-up fitting area
The inside of outer tube can be more stably in.In a preferred embodiment, on the composition surface of installation fitting area and installing zone
On be provided with lip ring.Lip ring can prevent that cement mortar enters in installation fitting area and installing zone during well cementation,
So that inner sleeve no longer keeps stable.
According to the second aspect of the invention, it is proposed that a kind of use is thermally shielded according to heat-insulated completion system described above
Completion method.This method includes, step 1：The tripping in outer tube into well；Step 2：The tripping in inner sleeve into outer tube, and
The make-up fitting area of inner sleeve is engaged with the make-up area of outer tube, formed between heat-insulated fitting area and thermal insulation areas continuous
Heat-insulation chamber；Step 3：External casing cementing；Step 4：Pulling force is applied to inner sleeve in well head, inner sleeve is elongated.
The method according to the invention, continuous heat-insulation chamber is formd between outer tube and inner sleeve, without other biographies
Thermal element, the heat greatly reduced in inner sleeve outwards conduct, and reduce thermal loss.In addition, after completion, steam leads to
Road is full-bore, reduces steam injection frictional resistance and steam injection pressure.
In one embodiment, the ratio between original length of the increment of inner sleeve and inner sleeve is 0.0001 to 0.001.It is logical
Cross and elongate inner sleeve in advance, the heated and caused length increase of the inner sleeve when conveying steam can be greatly reduced.So it is avoided that
The multiple length change of inner sleeve caused by more round steam soaks, also avoids the destruction to heat-insulated completion system,
Extend the service life of heat-insulated completion system.
In one embodiment, heat-barrier material is filled with heat-insulation chamber.Heat-barrier material can further improve device
Thermal insulation, the heat reduced in inner sleeve outwards conduct, and reduce thermal loss.
In this application, term " upstream " refers to the direction towards ground, and " downstream " refers to the direction opposite with upstream.
Compared with prior art, the advantage of the invention is that：(1) apparatus according to the invention, heat-insulation chamber cause to be continuous
Heat in inner sleeve has to pass through heat-insulation chamber conduction, without other heat transfer elements, greatly reduces the heat in inner sleeve
Outwards conduction, reduces thermal loss.(2) after the steam soak of excessive round, any change will not occur for heat-insulation chamber, because
This heat-insulated completion system can still keep good effect of heat insulation.(3) after oil well is scrapped, inner sleeve can also be taken out to repeat
Utilize, it is cost-effective, it equally also can easily change inner sleeve.In addition, the part that includes of heat-insulated completion system of the present invention compared with
Few, manufacturing cost is low, and use is also relatively simple.
Brief description of the drawings
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein：
Fig. 1 is schematically according to the structure of the heat-insulated completion system of the present invention；
Fig. 2 schematically shows the structure of the outer tube according to the present invention；
Fig. 3 schematically shows the structure of the inner sleeve according to the present invention；
Figure 4 and 5 schematically show state of the device of the present invention in practice of construction；
Fig. 6 schematically shows the state of the device of the present invention in production.
In the accompanying drawings, identical part uses identical reference.Accompanying drawing is not according to the ratio of reality.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 shows the structural representation of the heat-insulated completion system 10 according to the present invention.As shown in figure 1, heat-insulated completion dress
Putting 10 includes outer tube 20 and inner sleeve 30.In use, inner sleeve 30 is assemblied in the inside of outer tube 20, i.e., is coaxially enclosed on
Together.Outer tube 20 and inner sleeve 30 are discussed in detail separately below.
Fig. 2 shows the structural representation of the outer tube 20 according to the present invention.As shown in Fig. 2 outer tube 20 is tubular knot
Structure, it includes thermal insulation areas 21, the make-up area 22 in pars intermedia and the installing zone in downstream portion 23 in upstream portion.It is heat-insulated
The internal diameter D21 in area 21 is more than the internal diameter D22 in make-up area 22, and the internal diameter D23 of installing zone 23 is minimum.Thermal insulation areas 21 is used for and inner sleeve
30 respective regions cooperatively form heat-insulation chamber 11 (as shown in Figure 1), and make-up area 22 is used for the respective regions make-up with inner sleeve 30
Together, installing zone 23 is used to the respective regions of inner sleeve 30 be connected to carry inner sleeve 30.
Fig. 3 shows the structural representation of the inner sleeve 30 according to the present invention.As shown in figure 3, it is similar with outer tube 20, it is interior
Sleeve pipe 30 is also tubular structure, and inner sleeve 30 includes heat-insulated fitting area 31, the make-up in pars intermedia in upstream portion
Fitting area 32 and the installation fitting area 33 in downstream portion.The outer diameter D 31 of heat-insulated fitting area 31 is less than the outer of make-up fitting area 32
Footpath D32.In the confined state shown in Fig. 1, make-up fitting area 32 is combined with make-up area 22, and installs fitting area 33 and peace
Dress area 23 is combined.Because the external diameter of heat-insulated fitting area 31 is less than the external diameter of make-up fitting area 32, therefore heat-insulated fitting area 31
The inevitable internal diameter D21 again smaller than thermal insulation areas 21 of outer diameter D 31, so as to be formd between heat-insulated fitting area 31 and thermal insulation areas 21 continuously
Heat-insulation chamber 11.After the steam soak of excessive round, any change will not occur for continuous heat-insulation chamber 11, therefore heat-insulated complete
Well device 10 can still keep good effect of heat insulation.
Installing zone 23 and install fitting area 33 composition surface on be provided with lip ring 36 with to make-up fitting area 32 with
The connection in make-up area 22 and heat-insulation chamber 11 play a protective role.
In order to reduce the capacity of heat transmission of heat-insulation chamber 11, heat-barrier material will be filled with heat-insulation chamber 11.In one embodiment,
Heat-barrier material can be aerogel blanket, polyurethane foamed material, polystyrene foamed material etc..The heat-proof quality of these materials is very
Well, price is relatively low, and density is smaller, helps to reduce the weight of whole device.In addition, also in the inner surface of thermal insulation areas 21
It is upper to be provided with heat-reflecting layer 24, and it is also provided with heat-reflecting layer 34 on the outer surface of heat-insulated fitting area 31.So, heat-insulation chamber
Heat-reflecting layer 14 is provided with 11 inwall, so as to further reduce the capacity of heat transmission of heat-insulation chamber 11.In one embodiment,
One or more formation in heat-reflecting layer silvering, aluminium coat, zinc coating and aluminium foil.The brightness of this heat-reflecting layer is very high,
The blackness of the inwall of heat-insulation chamber 11 is greatly reduced, so as to reduce heat radiation, and then greatly reduces the heat conduction energy of heat-insulation chamber 11
Power, reduce thermal loss.
Internal thread is provided with make-up area 22, external screw thread is provided with make-up fitting area 32.So constructing
Cheng Zhong, the connection between make-up area 22 and make-up fitting area 32 can be realized by rotating inner sleeve 30 in well head, i.e. screw thread connects
Connect.Threaded connection can reach advantages below：By the turnning circle for calculating inner sleeve 30, it becomes possible to determine make-up fitting area 32 with
Whether make-up area 22 reaches the predetermined degree that is connected firmly, and facilitates construction.In addition, after oil well is scrapped, can also be by inner sleeve
Pipe 30 is taken out to reuse, cost-effective, equally also can easily change inner sleeve 30.
Preferably, it is provided with centralizer 35 at the heat-insulated fitting area 31 of inner sleeve 30.Centralizer 35 can ensure inner sleeve
30 is placed in the middle in outer tube 20, and heat-insulation chamber 11 turns into uniform toroidal, and this can make it that subsequent construction process is more convenient.
In one preferred embodiment, centralizer 35 is nonmetallic centralizer, to reduce heat transfer.
Describe to be thermally shielded completion method using heat-insulated completion system 10 below according to Fig. 4, Fig. 5 and Fig. 6.
Step 1：The tripping in outer tube 20 into well, as shown in Figure 4.Step 2：The tripping in inner sleeve 30 into outer tube 20,
And the make-up fitting area 32 of inner sleeve 30 is engaged with the make-up area 22 of outer tube 20, so heat-insulated fitting area 31 with it is heat-insulated
Continuous heat-insulation chamber 11 is formed between area 21, as shown in Figure 5.Step 3：Outer tube 20 is cemented the well, forms cementing concrete ring 51.
Step 4：Pulling force is applied to inner sleeve 30 in well head, inner sleeve 30 is elongated.
Preferably, the ratio between original length of the increment of inner sleeve 30 and inner sleeve 30 is 0.0001 to 0.001.For example,
At 300 DEG C, length is that 1000 meters of inner sleeve 30 can be elongated 0.3 meter.By elongating inner sleeve 30 in advance, can greatly reduce
30 heated and caused length of the inner sleeve increase when conveying steam.Inner sleeve caused by so avoiding more round steam soaks
More than 30 length change of pipe, also avoids the destruction to heat-insulated completion system 10, extends heat-insulated completion system 10
Service life.
Fig. 6 schematically shows the state of the heat-insulated completion system 10 of the present invention in production.In geothermal exploitation or thick
During oily thermal recovery, the heat loss for the steam that the inside tripping in oil pipe 60 to heat-insulated completion system 10 is injected with reduction in oil pipe 60.
Although by reference to preferred embodiment, invention has been described, is not departing from the situation of the scope of the present invention
Under, various improvement can be carried out to it and part therein can be replaced with equivalent.Especially, as long as being rushed in the absence of structure
Prominent, the every technical characteristic being previously mentioned in each embodiment can combine in any way.The invention is not limited in text
Disclosed in specific embodiment, but all technical schemes including falling within the scope of the appended claims.
Claims (9)
1. a kind of heat-insulated completion system, including：
Outer tube, the outer tube include thermal insulation areas in its upstream portion and adjacent with the thermal insulation areas and in described heat-insulated
The make-up area in area downstream,
The inner sleeve being arranged in the outer tube, the inner sleeve include coordinating with the make-up area in portion downstream
Make-up fitting area and the heat-insulated fitting area in the make-up fitting area upstream,
After the inner sleeve is installed in outer tube, the make-up fitting area engages with the make-up area, described heat-insulated
Continuous heat-insulation chamber is formed between fitting area and the thermal insulation areas；
The internal diameter of the thermal insulation areas is more than the internal diameter in the make-up area, and the external diameter of the heat-insulated fitting area coordinates less than the make-up
The external diameter in area, the make-up fitting area are connected with the make-up area by screw thread.
2. device according to claim 1, it is characterised in that on the inner surface of the thermal insulation areas and/or heat-insulated cooperation
Heat-reflecting layer is provided with the outer surface in area.
3. device according to claim 2, it is characterised in that the heat-reflecting layer by the inner surface of thermal insulation areas and/or
One or more formation in silvering, aluminium coat, zinc coating and aluminium foil on the outer surface of heat-insulated fitting area.
4. the device according to any one of Claim 1-3, it is characterised in that in the heat-insulated fitting area of the inner sleeve
Place is provided with centralizer.
5. the device according to any one of Claim 1-3, it is characterised in that the outer tube is also included in described
The installing zone in make-up area downstream, the inner sleeve also include the installation fitting area in the make-up fitting area downstream,
After the inner sleeve is installed in outer tube, the installing zone engages with installation fitting area.
6. device according to claim 5, it is characterised in that set on the composition surface of the installation fitting area and installing zone
It is equipped with lip ring.
7. a kind of heat-insulated completion system of use according to any one of claim 1 to 6 is thermally shielded completion method, bag
Include,
Step 1：The tripping in outer tube into well；
Step 2：The tripping in inner sleeve into the outer tube, and make the make-up fitting area of the inner sleeve and the outer tube
Make-up area engage, form continuous heat-insulation chamber between the heat-insulated fitting area and the thermal insulation areas；
Step 3：The outer tube is cemented the well；
Step 4：Pulling force is applied to the inner sleeve in well head, the inner sleeve is elongated.
8. according to the method for claim 7, it is characterised in that the increment of the inner sleeve is original with the inner sleeve
Length ratio is 0.0001 to 0.001.
9. the method according to claim 7 or 8, it is characterised in that heat-barrier material is filled with the heat-insulation chamber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410276147.3A CN105275406B (en) | 2014-06-19 | 2014-06-19 | Heat-insulated completion system and heat-insulated completion method |
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| CN201410276147.3A CN105275406B (en) | 2014-06-19 | 2014-06-19 | Heat-insulated completion system and heat-insulated completion method |
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| CN105275406B true CN105275406B (en) | 2017-12-26 |
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| CN106401567B (en) * | 2016-08-30 | 2019-08-02 | 湖南中大经纬地热开发科技有限公司 | A kind of water-level and water-temperature automatic monitoring system based on geothermal well |
| CN106437628B (en) * | 2016-08-30 | 2018-12-18 | 湖南中大经纬地热开发科技有限公司 | Based on farinose argillic horizon, boulder bed, argillaceous siltstoue multilayer geology geothermal well |
| CN106321023B (en) * | 2016-08-30 | 2018-12-07 | 湖南中大经纬地热开发科技有限公司 | The geothermal well of diluvial formation is rushed based on the 4th system |
| CN106246142B (en) * | 2016-08-30 | 2018-10-12 | 湖南中大经纬地热开发科技有限公司 | A kind of geothermal well based on complicated ground stratum |
| CN106194148B (en) * | 2016-08-30 | 2018-08-17 | 湖南中大经纬地热开发科技有限公司 | A kind of geothermal well based on wind and rain playground |
| CN106194124B (en) * | 2016-08-30 | 2018-10-19 | 湖南中大经纬地热开发科技有限公司 | Geothermal well based on Bedrock Geology |
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| CN201090202Y (en) * | 2007-09-24 | 2008-07-23 | 辽河石油勘探局 | Heat insulation pipe without coupling |
| DE102009028306A1 (en) * | 2009-08-06 | 2011-02-24 | Tpr Fiberdur Gmbh & Co. Kg | double tube |
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| CN105275406A (en) | 2016-01-27 |
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