CN108590580A - A kind of hot dry rock production practice and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency - Google Patents
A kind of hot dry rock production practice and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 88
- 238000012546 transfer Methods 0.000 title claims abstract description 60
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title claims abstract description 19
- 239000013529 heat transfer fluid Substances 0.000 claims abstract description 59
- 239000012530 fluid Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000002627 tracheal intubation Methods 0.000 claims abstract description 9
- 238000005553 drilling Methods 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000012856 packing Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 20
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 235000019441 ethanol Nutrition 0.000 claims description 2
- 238000011017 operating method Methods 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 18
- 238000011161 development Methods 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 238000003860 storage Methods 0.000 abstract 1
- 238000002513 implantation Methods 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000003014 reinforcing effect Effects 0.000 description 5
- 238000005338 heat storage Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 230000006378 damage Effects 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 238000012937 correction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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
-
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G7/00—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for
- F03G7/04—Mechanical-power-producing mechanisms, not otherwise provided for or using energy sources not otherwise provided for using pressure differences or thermal differences occurring in nature
-
- 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
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- Engineering & Computer Science (AREA)
- Geology (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A kind of hot dry rock production practice and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency, belongs to the technical field of geothermal energy development.Method is：The position for determining hot dry rock reservoir drills out vertical section, horizontal segment with drilling tool；Vertical section tripping in conventional cannula, horizontal segment tripping in inner wall are equipped with the horizontal wellbore of fin heat exchange element；Cementing concrete ring is set in vertical section, heat-transfer fluid is injected between horizontal wellbore and hot dry rock；In shaft bottom sealing intubation packing storage；Tripping in insulated tubing forms the closed cycle of annular space oil pipe；Low temperature heat transfer fluid is pumped into annular space on ground, and produces the high temperature heat transfer fluid after heating in oil pipe；The present invention is full of heat-transfer fluid between horizontal wellbore and rock, its heat transfer property is got well than cement sheath, not only there is heat transfer to also have thermal convection current effect with the heat exchange in horizontal wellbore, so that the heat of hot dry rock is quickly passed in annular space and takes hot fluid, increase hot dry rock exploitation adopts the thermal efficiency, reduces cost.
Description
Technical field
The present invention relates to a kind of hot dry rock production practices and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency, belong to ground
The technical field of thermal energy exploitation.
Background technology
As economic increases rapidly, demand of the China to the energy is increasing, especially for geothermal energy, it is this can be again
Raw clean energy resource.Hot dry rock is widely distributed in China, wherein containing a large amount of geothermal energy, has great development potentiality, is
The important goal of geothermal energy resources future development.But hot dry rock buried depth is more than 200 DEG C in 2-6km, temperature, periphery geological activity
More active, development difficulty is very big.
Current hot dry rock exploitation mainly forms artificial heat storage in the earth formation by technologies such as hydraulic fracturings, then passes through producing well
Hot water in the artificial heat storage of exploitation generates electricity.But since hot dry rock generally buries relatively deeply, rock mass is fine and close, and permeability is low, because
This large-scale hydraulic fracturing process is more difficult.In addition, hydraulic fracturing cost is higher, the destruction of pollution and stratum to environment
It is larger.
Chinese patent CN105909214A discloses a kind of long horizontal well self-loopa of utilization and exploits fine and close dry-hot-rock geothermal energy
Method, this method is using the long horizontal well of single port in hot dry rock reservoir, under not pressure break hot dry rock reservoir conditions, using its oil
Pipe-annular circulation structure, the cycle note for take thermal medium is adopted, to carry out underground heat exploitation.This method avoid pressure breaks to cause
Fluid loss problem, long horizontal sections are even more to effectively increase the contact area of pit shaft and reservoir.But there are following for this method
Shortcoming：Thermal energy is transmitted to casing by stratum by cement mortar, then is delivered heat to by casing and taken thermal medium, this process fully relies on Jie
Heat exchange between matter, heat transfer efficiency is limited in system；In addition horizontal wells hot dry rock, the heat transfer of hot dry rock and stratum are used
Relatively slowly, it is relatively low to adopt the thermal efficiency, horizontal segment needs several kms long, and well-digging and Completion cost are higher, and economy is poor.Therefore, it is necessary to
Strengthen the heat transfer type of pit shaft, the thermal efficiency is adopted in raising, improves development effectiveness of the horizontal well closed cycle to dry-hot-rock geothermal, such
Improving has important theory and application value.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of hot dry rocks for strengthening horizontal wellbore heat transfer efficiency to exploit work
Skill；
The present invention also provides the horizontal wellbores of the hot dry rock exploitation of above-mentioned reinforcing horizontal wellbore heat transfer efficiency.
Fin heat exchange element enhancing casing is arranged on the basis of horizontal wells hot dry rock in the present invention on horizontal wellbore
With the heat transfer efficiency of fluid in annular space；In net horizontal section casing（Horizontal wellbore）Between rock existing skill is replaced with heat-transfer fluid
Cement in art increases thermal convection current on the basis of heat transfer, enhances the heat transfer efficiency between hot dry rock and casing.
Technical scheme is as follows：
A kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency, including steps are as follows：
1）The position for determining hot dry rock reservoir drills out vertical section with drilling tool；
2）After vertical well section is bored up to hot dry rock reservoir, using deflecting tool deflecting, horizontal segment is drilled out；
3）Tripping in production casing in the wellbore, vertical section tripping in conventional cannula；
4）Cementing concrete ring is set in vertical section, in shaft bottom sealing intubation packing reservoir and heat-transfer fluid；
5）Tripping in insulated tubing forms the closed cycle of annular space-oil pipe；
6）Low temperature heat transfer fluid is pumped into annular space on ground, and by the high temperature heat transfer stream after the heating of hot dry rock reservoir in oil pipe
Body produces；
7）Annular space is injected using the thermal energy in high temperature heat transfer fluid, and by the low temperature heat transfer fluid formed after cooling, forms cycle.
It is characterized in that, in the step 3）It further include the horizontal wellbore that heat exchange element is equipped in horizontal segment tripping in inner wall；
The step 4）Further include injecting heat-transfer fluid between the horizontal wellbore and hot dry rock of horizontal well.
The advantage designed herein is, using horizontal well circulating heat conduction, compares hydraulic fracturing technology, can reduce cost, prevent
Only damage of the fracturing fluid to reservoir prevents fluid loss in artificial heat storage.Full of heat transfer between net horizontal section casing and rock
Fluid, heat transfer property are got well than conventional cement ring, and the heat of hot dry rock is enable quickly to pass to the heat transfer stream in annular space
Body, increase hot dry rock exploitation adopts the thermal efficiency.
Another side disclosed by the invention, the heat-transfer fluid are water or ethyl alcohol or ethylene glycol or supercritical CO2。
Another side disclosed by the invention, the step 4）Operating method be：After setting of casing, injection displacement fluid will
Drilling mud replaces out pit shaft, and the heel end of injection cement mortar to horizontal segment injects heat-transfer fluid after cement slurry sets from shaft bottom
Make the gap between the casing and hot dry rock of its fullness level section, while insulating heat-transfer fluid in shaft bottom tripping in sealing intubation.
If heat-transfer fluid has leakage, heat transfer fluid can be supplemented to casing annulus by sealing intubation.
The advantage designed herein is, prior art filling concrete between horizontal segment pit shaft and hot dry rock, cement conduct
Fixed material, when the heat of hot dry rock is transmitted to low temperature heat transfer fluid in horizontal bush, heat exchange between the two is only
By heat transfer, and this technology replaces cement using heat-transfer fluid, cryogenic heat transfer in the heat-transfer fluid and horizontal bush in annular space
There is only heat transfer between fluid there is also thermal convection current, and heat transfer efficiency greatly increases, while increasing adopting for hot dry rock exploitation yet
The thermal efficiency saves funds.
Strengthen the horizontal wellbore of the hot dry rock exploitation of horizontal wellbore heat transfer efficiency as described above, is set in the horizontal wellbore
It is equipped with fin heat exchange element, the fin heat exchange element is arranged radially in the inside of the horizontal wellbore.
The advantage designed herein is that fin heat exchange element can increase the heat-transfer surface of casing wall and heat-transfer fluid in annular space
Product and convection transfer rate, increase the heat transfer efficiency of hot dry rock and fluid with this.
The arrangement packing density of another side disclosed by the invention, the fin heat exchange element is 30-50/m.
Fin is arranged on the fin heat exchange element in another side disclosed by the invention in a ring, and the height of the fin is
8-12mm, the spacing between fin are 13-17mm.
Another side disclosed by the invention, the fin heat exchange element are that spiral fins heat exchange element or rippled fin change
Thermal element.
Another side disclosed by the invention, a diameter of 200-400mm of the horizontal wellbore, heat transfer fluid circulation amount are 300-
900m3The temperature of/d, pit shaft are 80-220 DEG C.
Beneficial effects of the present invention are：
1, the present invention is full of heat-transfer fluid between horizontal wellbore and rock, and heat transfer property is got well than cement sheath and horizontal well
Heat exchange in cylinder not only has heat transfer to also have thermal convection current effect, and the heat of hot dry rock is enable quickly to pass in annular space
Take hot fluid, increase hot dry rock exploitation adopts the thermal efficiency, reduces cost.
2, the present invention uses horizontal wells hot dry rock, compares hydraulic fracturing technology, can reduce cost, prevent fracturing fluid pair
The damage of reservoir prevents fluid loss in artificial heat storage.
3, the inner wall of horizontal wellbore of the present invention is provided with fin heat exchange element, can increase horizontal tube wall and annular space
The heat exchange area and convection transfer rate of middle heat-transfer fluid, increase the heat transfer efficiency of hot dry rock and fluid with this.
Description of the drawings
Fig. 1 is the schematic diagram of the embodiment of the present invention 1；
In Fig. 1,1, cap rock；2, hot dry rock reservoir；3, horizontal wellbore；4, cementing concrete ring；5, insulated tubing；6, heat-transfer fluid；
7, heat exchange element；8, sealing intubation.
Specific implementation mode
The present invention is described in detail with reference to embodiment and Figure of description, but not limited to this.
Embodiment 1
A kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency, including steps are as follows：
1）The position for determining hot dry rock reservoir 2 drills out vertical section with drilling tool；
2）After vertical well section is bored up to hot dry rock reservoir, using deflecting tool deflecting, horizontal segment is drilled out；
3）Tripping in production casing in the wellbore, vertical section tripping in conventional cannula；
4）In vertical section setting cementing concrete ring 4, in shaft bottom 8 packing reservoir of sealing intubation and heat-transfer fluid 6；
5）Tripping in insulated tubing 5 forms the closed cycle of annular space-oil pipe；
6）Low temperature heat transfer fluid is pumped into annular space on ground, and by the high temperature after the heating of hot dry rock reservoir in insulated tubing 5
Heat-transfer fluid produces；
7）Annular space is injected using the thermal energy in high temperature heat transfer fluid, and by the low temperature heat transfer fluid formed after cooling, forms cycle.
It is characterized in that, in the step 3）It further include the horizontal wellbore that heat exchange element 7 is equipped in horizontal segment tripping in inner wall
3；The step 4）Further include injecting heat-transfer fluid between the horizontal wellbore 3 and hot dry rock of horizontal well.
Embodiment 2
A kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency as described in Example 1, difference lies in the biographies
Hot fluid 6 is water.
Embodiment 3
A kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency as described in Example 1, difference lies in steps 4）
Described in heat-transfer fluid 6 is injected between the horizontal wellbore and hot dry rock of horizontal well, in the side of vertical section setting cementing concrete ring 4
Method is：After setting of casing, drilling mud is replaced out pit shaft by injection displacement fluid, the heel end of injection cement mortar to horizontal segment,
After cement slurry sets, from shaft bottom, injection heat-transfer fluid 6 makes the gap between its fullness level pit shaft and hot dry rock, while in well
It is beneath enter sealing intubation 8 heat-transfer fluid 6 is insulated, if heat-transfer fluid 6 has leakage, 8 pipes can be inserted by sealing to outside casing
Annular space supplements heat transfer fluid 6.
Embodiment 4
Horizontal wellbore used in a kind of hot dry rock production practice of reinforcing horizontal wellbore heat transfer efficiency as described in embodiment 1-3,
Fin heat exchange element 7 is provided in the horizontal wellbore 3, the fin heat exchange element 7 is arranged radially in the horizontal wellbore 3
Inside.
Embodiment 5
Horizontal wellbore used in a kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency as described in Example 4,
Difference lies in the fin heat exchange element 7 is the fin heat exchange element of screw type.
Embodiment 6
Horizontal wellbore used in a kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency as described in Example 4,
Difference lies in the fin heat exchange element 7 is rippled fin heat exchange element, and the fin heat exchange element 7 is on horizontal wellbore
Arrangement packing density be 50/m；Fin is set in a ring on the fin heat exchange element 7, and the height of the fin is
10mm, the spacing between fin are 15mm；A diameter of 400mm of the horizontal wellbore, heat transfer fluid circulation amount are 800m3/ d,
The temperature of pit shaft is 200 DEG C.
Embodiment 7
One kind as described in a kind of hot dry rock production practice of reinforcing horizontal wellbore heat transfer efficiencys of embodiment 1-3 and embodiment 4-6
Strengthen the horizontal wellbore used in the hot dry rock production practice of horizontal wellbore heat transfer efficiency, difference lies in the xeothermic of, producing area
The buried depth of rock reservoir 2 is 3000m, and reservoir pressure 31MPa, reservoir temperature is 250 DEG C.In net horizontal section rock and casing
Between injection water be used as heat-transfer fluid 6, vertical well segment length 3000m is set, and extended horizontal depth 2600m is changed using fin is not provided with
The common horizontal wellbore of thermal element 7, is tested.The prior art that cement mortar is injected with the present embodiment contrast level well section, is adopted
Thermal efficiency correction data is shown in Table 1.
1 comparative example 7 of table and the prior art adopt the thermal efficiency
| Low temperature heat transfer fluid Implantation temperature | Injection speed Degree | 7 gained well of embodiment Mouth high temperature heat transfer fluid Temperature | Well head obtained by the prior art is high Warm heat-transfer fluid temperature | This method compares the prior art, Adopt hot temperature increase |
| 25℃ | 300m3/d | 210℃ | 202℃ | 8℃ |
| 25℃ | 600m3/d | 168℃ | 157℃ | 11℃ |
| 25℃ | 900m3/d | 141℃ | 127℃ | 14℃ |
As shown in table 1, into annular space, water filling is as low temperature heat transfer fluid at well head, and the implantation temperature of well head is 25 DEG C, injection
Speed is 300m3/ d, the cold water of injection produce ground in net horizontal section by ground layer for heating, and by insulated tubing, realize that water exists
Closed cycle in horizontal well annular space-oil pipe, dry-hot-rock geothermal is exploited with this.Can be reached by being computed wellhead temperature by 210 DEG C, with
The prior art that cryogen replaces cement mortar is not used to compare, well head hot water temperature can improve 8 DEG C.When injection rate is
600m3When/d, wellhead temperature can reach 168 DEG C, than not using intensified heat transfer method to improve 11 DEG C；When injection rate is
900m3When/d, wellhead temperature can reach 141 DEG C, than not using intensified heat transfer method to improve 14 DEG C.
It can be known by contrast experiment, water is injected only between net horizontal section rock and casing as heat-transfer fluid 6, without adopting
The improvement feature for adopting the thermal efficiency can be increased with another of the invention, can also realize the increase for adopting hot temperature.
Embodiment 8
One kind as described in a kind of hot dry rock production practice of reinforcing horizontal wellbore heat transfer efficiencys of embodiment 1-3 and embodiment 4-6
Strengthen the horizontal wellbore used in the hot dry rock production practice of horizontal wellbore heat transfer efficiency, difference lies in the xeothermic of, producing area
The buried depth of rock reservoir 2 is 3000m, and reservoir pressure 31MPa, reservoir temperature is 250 DEG C.Vertical well segment length 3000m is set,
Extended horizontal depth 2600m, using the horizontal wellbore for being provided with fin heat exchange element 7, but net horizontal section rock and casing it
Between cement sheath is set, comparison adopts thermal efficiency comparison number using 8 the method for the prior art and the present embodiment of common horizontal wellbore
According to being shown in Table 2.
2 comparative example 8 of table and the prior art adopt the thermal efficiency
| Low temperature heat transfer fluid Implantation temperature | Injection speed Degree | 8 gained well of embodiment Mouth high temperature heat transfer fluid Temperature | Well head obtained by the prior art is high Warm heat-transfer fluid temperature | Embodiment 8 compares existing skill Art adopts hot temperature increase |
| 25℃ | 300m3/d | 215℃ | 202℃ | 13℃ |
| 25℃ | 600m3/d | 175℃ | 157℃ | 18℃ |
| 25℃ | 900m3/d | 149℃ | 127℃ | 22℃ |
As shown in table 2, into annular space, the pico- low temperature heat transfer fluid of water filling, the implantation temperature of well head are 25 DEG C at well head, injection
Speed is 300m3/ d, the cold water of injection produce ground in net horizontal section by ground layer for heating, and by insulated tubing, realize that water exists
Closed cycle in horizontal well annular space-oil pipe, dry-hot-rock geothermal is exploited with this.Can be reached by being computed wellhead temperature by 215 DEG C, with
It is compared without using the prior art for the horizontal wellbore for being provided with fin heat exchange element, well head hot water temperature can improve 13 DEG C.When
Injection rate is 600m3When/d, wellhead temperature can reach 175 DEG C, than not using intensified heat transfer method to improve 18 DEG C；Work as injection
Speed is 900m3When/d, wellhead temperature can reach 149 DEG C, than not using intensified heat transfer method to improve 22 DEG C.
It can be known by contrast experiment, using only the horizontal wellbore for being provided with fin heat exchange element 7, without using the present invention
Another can increase the improvement feature for adopting the thermal efficiency, can also realize the increase for adopting hot temperature.
Embodiment 9
One kind as described in a kind of hot dry rock production practice of reinforcing horizontal wellbore heat transfer efficiencys of embodiment 1-3 and embodiment 4-6
Strengthen the horizontal wellbore used in the hot dry rock production practice of horizontal wellbore heat transfer efficiency, difference lies in the xeothermic of, producing area
The buried depth of rock reservoir 2 is 3000m, and reservoir pressure 31MPa, reservoir temperature is 250 DEG C.Vertical well segment length 3000m is set,
Extended horizontal depth 2600m is noted using the horizontal wellbore for being provided with fin heat exchange element 7 between net horizontal section rock and casing
Enter water as heat-transfer fluid 6.The prior art and the present embodiment the method are compared, thermal efficiency correction data is adopted and is shown in Table 3.
3 comparative example 9 of table and the prior art adopt the thermal efficiency
| Low temperature heat transfer fluid Implantation temperature | Injection rate | 9 gained well of embodiment Mouth high temperature heat transfer stream Temperature | Well head obtained by the prior art is high Warm heat-transfer fluid temperature | Embodiment 9 compares existing skill Art adopts hot temperature increase |
| 25℃ | 300m3/d | 224℃ | 202℃ | 22℃ |
| 25℃ | 600m3/d | 186℃ | 157℃ | 29℃ |
| 25℃ | 900m3/d | 165℃ | 127℃ | 38℃ |
As shown in table 3, into annular space, the pico- low temperature heat transfer fluid of water filling, the implantation temperature of well head are 25 DEG C at well head, injection
Speed is 300m3/ d, the cold water of injection produce ground in net horizontal section by ground layer for heating, and by insulated tubing, realize that water exists
Closed cycle in horizontal well annular space-oil pipe, dry-hot-rock geothermal is exploited with this.Can be reached by being computed wellhead temperature by 224 DEG C, with
The prior art of intensified heat transfer method is not used to compare, well head hot water temperature can improve 22 DEG C.When injection rate is 600m3/d
When, wellhead temperature can reach 186 DEG C, than not using intensified heat transfer method to improve 29 DEG C；When injection rate is 900m3When/d,
Wellhead temperature can reach 165 DEG C, than not using intensified heat transfer method to improve 38 DEG C.
By contrast experiment it is found that simultaneously using the horizontal wellbore for being provided with fin heat exchange element 7, net horizontal section rock with
Water is injected between casing as heat-transfer fluid 6, is adopted hot temperature increase higher, is adopted thermal efficiency higher.
Claims (8)
1. a kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency, including steps are as follows：
1）The position for determining hot dry rock reservoir drills out vertical section with drilling tool；
2）After vertical well section is bored up to hot dry rock reservoir, using deflecting tool deflecting, horizontal segment is drilled out；
3）Tripping in production casing in the wellbore, vertical section tripping in conventional cannula；
4）Cementing concrete ring is set in vertical section, in shaft bottom sealing intubation packing reservoir and heat-transfer fluid；
5）Tripping in insulated tubing forms the closed cycle of annular space-oil pipe；
6）Low temperature heat transfer fluid is pumped into annular space on ground, and by the high temperature heat transfer stream after the heating of hot dry rock reservoir in oil pipe
Body produces；
7）Annular space is injected using the thermal energy in high temperature heat transfer fluid, and by the low temperature heat transfer fluid formed after cooling, forms cycle,
It is characterized in that, in the step 3）It further include the horizontal wellbore that heat exchange element is equipped in horizontal segment tripping in inner wall；It is described
Step 4）Further include injecting heat-transfer fluid between the horizontal wellbore and hot dry rock of horizontal well.
2. a kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency according to claim 1, which is characterized in that
The heat-transfer fluid is water or ethyl alcohol or ethylene glycol or supercritical CO2。
3. a kind of hot dry rock production practice for strengthening horizontal wellbore heat transfer efficiency according to claim 1, which is characterized in that
The step 4）Operating method be：After setting of casing, drilling mud is replaced out pit shaft by injection displacement fluid, injects cement
Starch to the heel end of horizontal segment, after cement slurry sets, from shaft bottom injection heat-transfer fluid make the casing of its fullness level section with it is xeothermic
Gap between rock, while insulating heat-transfer fluid in shaft bottom tripping in sealing intubation.
4. a kind of horizontal wellbore of hot dry rock exploitation that strengthening horizontal wellbore heat transfer efficiency, which is characterized in that the horizontal well
It is provided with fin heat exchange element in cylinder, the fin heat exchange element is arranged radially in the inside of the horizontal wellbore.
5. a kind of horizontal wellbore of hot dry rock exploitation for strengthening horizontal wellbore heat transfer efficiency according to claim 4,
It is characterized in that, the arrangement packing density of the fin heat exchange element is 30-50/m.
6. a kind of horizontal wellbore of hot dry rock exploitation for strengthening horizontal wellbore heat transfer efficiency according to claim 4,
Be characterized in that, fin be set in a ring on the fin heat exchange element, the height of the fin is 8-12mm, between fin between
Away from for 13-17mm.
7. a kind of horizontal wellbore of hot dry rock exploitation for strengthening horizontal wellbore heat transfer efficiency according to claim 4,
It is characterized in that, the fin heat exchange element is spiral fins heat exchange element or rippled fin heat exchange element.
8. a kind of horizontal wellbore of hot dry rock exploitation for strengthening horizontal wellbore heat transfer efficiency according to claim 4,
It is characterized in that, a diameter of 200-400mm of the horizontal wellbore, heat-transfer fluid flow is 300-900m3The temperature of/d, pit shaft is
80-220℃。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340176.XA CN108590580A (en) | 2018-04-16 | 2018-04-16 | A kind of hot dry rock production practice and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810340176.XA CN108590580A (en) | 2018-04-16 | 2018-04-16 | A kind of hot dry rock production practice and its horizontal wellbore for strengthening horizontal wellbore heat transfer efficiency |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110952928A (en) * | 2019-09-27 | 2020-04-03 | 中煤科工集团西安研究院有限公司 | Well completion device and method for efficiently developing and utilizing hot dry rock |
| CN111287672A (en) * | 2020-04-16 | 2020-06-16 | 东北石油大学 | Heat exchange and heat insulation sleeve for exploiting terrestrial heat by utilizing waste oil well |
| CN114876439A (en) * | 2022-06-28 | 2022-08-09 | 张�林 | Geothermal well body structure for well wall heat exchange and well cementation method |
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| CN206647084U (en) * | 2017-02-27 | 2017-11-17 | 中国地质大学（武汉） | A kind of dry-hot-rock geothermal quarrying apparatus |
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| CN110952928A (en) * | 2019-09-27 | 2020-04-03 | 中煤科工集团西安研究院有限公司 | Well completion device and method for efficiently developing and utilizing hot dry rock |
| CN110952928B (en) * | 2019-09-27 | 2022-02-01 | 中煤科工集团西安研究院有限公司 | Well completion device and method for efficiently developing and utilizing hot dry rock |
| CN111287672A (en) * | 2020-04-16 | 2020-06-16 | 东北石油大学 | Heat exchange and heat insulation sleeve for exploiting terrestrial heat by utilizing waste oil well |
| CN114876439A (en) * | 2022-06-28 | 2022-08-09 | 张�林 | Geothermal well body structure for well wall heat exchange and well cementation method |
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Application publication date: 20180928 |