CN107476797A - A kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type - Google Patents
A kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type Download PDFInfo
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- CN107476797A CN107476797A CN201710725015.8A CN201710725015A CN107476797A CN 107476797 A CN107476797 A CN 107476797A CN 201710725015 A CN201710725015 A CN 201710725015A CN 107476797 A CN107476797 A CN 107476797A
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- 238000003032 molecular docking Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000015572 biosynthetic process Effects 0.000 claims abstract description 13
- 239000004927 clay Substances 0.000 claims abstract description 12
- 239000011152 fibreglass Substances 0.000 claims description 26
- 239000004568 cement Substances 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 15
- 239000010959 steel Substances 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 12
- 239000003208 petroleum Substances 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 10
- 239000012774 insulation material Substances 0.000 claims description 8
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 6
- 239000011083 cement mortar Substances 0.000 claims description 6
- 239000011496 polyurethane foam Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 238000007789 sealing Methods 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 claims description 3
- 235000011613 Pinus brutia Nutrition 0.000 claims description 3
- 241000018646 Pinus brutia Species 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000011010 flushing procedure Methods 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 239000004575 stone Substances 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims 1
- 231100000241 scar Toxicity 0.000 claims 1
- 239000003673 groundwater Substances 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 6
- 239000011435 rock Substances 0.000 description 4
- 238000004140 cleaning Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
-
- 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
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
-
- 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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- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Geochemistry & Mineralogy (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Physics & Mathematics (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Earth Drilling (AREA)
Abstract
A kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type provided by the invention, first in ground surface perforate, pierce in stable clay layer or below bedrock surface, straight well one is formed to drive a well eye, then two are proceeded by open from the drive a well bottom of eye of straight well one, until piercing thickness in purpose heat reservori>Below 6m any shale layer, form straight well two and drive a well eye；Then perforate is being proceeded by from the floor surface position away from straight well well head center at least 250m, pierce in stable clay layer or below bedrock surface, the horizontal engineering well one of formation drives a well eye, then two are proceeded by open from the drive a well bottom of eye of horizontal engineering well one, the horizontal engineering well two of formation drives a well eye, and it is being docked and connected with the eye that drives a well of straight well two, and then make it that horizontal engineering well shaft and straight well pit shaft slitless connection form U-typed pipeline, the structure cuts that surface area is big, amount of heat exchange water is big and heat exchange amount is big；The present invention only realizes heat exchange using cold and hot water circulation, and groundwater abstraction, water conservation, while not polluted underground water, not green.
Description
Technical field
The invention belongs to geothermal energy development technical field, is related to a kind of casing programme of the horizontal docking geothermal well of heat exchange type
Construction method.
Background technology
The domestic exploitation at present to 1500~3000m mid-deep strata geothermal resource of hydrothermal types has three kinds of modes：The first is to bore
A bite straight well, therefrom direct extraction geothermal water, not recharge；Second is to bore a bite straight well as extraction well, and periphery bores more mouthfuls
Straight well is combined as inverted well, extraction with recharge；The third is to bore a bite straight well, the tripping in concentric tube in well, using concentric
Pipe is inside and outside to carry out cold and hot water circulation heat exchange.Problems be present in these three development schemes：1. all by aqueous heat reservori (sand layers)
As target zone, aqueous heat reservori tripping in filter pipe completion (filter pipe by seamless steel cased bore-bole after stainless steel outer packed drainage
Net composition), thus do not completely cut off between pit shaft and heat reservori, hydraulic connection be present；2. have and different degrees of directly or indirectly take out
Underground water is taken, and excessive groundwater abstraction is easily caused surface subsidence aggravation, ground fissure activity increase；3. influenceed by formation properties,
Recharge underground water less effective, it is difficult to reach and adopt filling balance, while the easy polluted underground water of recharge water；4. straight well concentric tube heat exchange by
Casing programme size limits, and the concentric tube caliber of tripping in is smaller, and circulating water flow and heat exchange amount are smaller.In general, at present
Development scheme can not reach or can not be fully achieved the purpose of " only taking heat not fetch water ".
The content of the invention
It is an object of the invention to provide a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type, solve
The problem of existing mid-deep strata geothermal resource of hydrothermal type development scheme " both having taken heat or water intaking ", it is truly realized and " only takes heat not take
The purpose of water ".
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type provided by the invention, including following step
Suddenly：
The first step, perforate is proceeded by from floor surface, drills topsoil and unconsolidated formation, until piercing in stable clay layer
Or below bedrock surface, form straight well one and drive a well eye；
Second step, straight well one drive a well intraocular place straight well one drive sleeve pipe；
3rd step, to straight well one drive sleeve pipe and straight well one drive a well eye the borehole wall between filling straight well one open cementing concrete, directly
Cementing concrete is opened to straight well one to return to ground；
4th step, proceed by two from the drive a well bottom of eye of straight well one and open, until piercing thickness in purpose heat reservori>6m's
Below any shale layer, form straight well two and drive a well eye；
5th step, drive a well eye in straight well two and straight well one is opened and straight well two is placed in sleeve pipe drives sleeve pipe；
6th step, to straight well two drive sleeve pipe and straight well two drive a well eye and straight well one drive sleeve pipe between filling straight well two open well cementation
Cement, until straight well two is opened cementing concrete and returned to ground；
7th step, perforate is proceeded by from the floor surface position away from straight well well head center at least 250m, drills topsoil
And unconsolidated formation, until pierce in stable clay layer or below bedrock surface, the horizontal engineering well one of formation drives a well eye；
8th step, sleeve pipe is driven in the horizontal engineering well one horizontal engineering well one of intraocular placement that drives a well；
9th step, to horizontal engineering well one drive sleeve pipe and horizontal engineering well one drive a well eye the borehole wall between fill level engineering
Well one opens cementing concrete, until horizontal engineering well one is opened cementing concrete and returned to ground；
Tenth step, proceeding by two from the drive a well bottom of eye of horizontal engineering well one and open, the horizontal engineering well two of formation drives a well eye,
Wherein, horizontal engineering well two eye that drives a well includes vertical section, inclination section and horizontal segment, and is followed successively by vertical section, deflecting from top to bottom
Section and horizontal segment, bottom and the straight well two of horizontal segment drive a well eye and straight well two is driven sleeve pipe and is docked and connected；
11st step, drive a well eye in horizontal engineering well two and horizontal engineering well one is opened the horizontal engineering well two of placement in sleeve pipe and opened
Sleeve pipe；
12nd step, opens that sleeve pipe and horizontal engineering well two drive a well eye and horizontal engineering well one drives sleeve pipe to horizontal engineering well two
Between fill level engineering well two open cementing concrete, until horizontal engineering well two is opened cementing concrete and returned to ground；
13rd step, horizontal engineering well two are opened after cementing concrete reaches the cementing time, and tripping in drilling tool is swept in horizontal engineering well
Except residual cement in pit shaft and horizontal engineering well two open the casing hardware of cannula end, until two well shafts communicate, under straight well is interior
Enter residual cement in drilling tool cleaning pit shaft, until straight well artificial bottom of a well；
14th step, well-flushing is carried out to straight well and horizontal engineering well shaft, water sand removal is washed till and uses up.
Preferably, in the first step, straight well one drive a well eye use drill bit a diameter of 444.5mm；In 4th step, straight well two
The a diameter of 241.3mm for the drill bit that the eye that drives a well uses；In 7th step, horizontal engineering well one drive a well eye use drill bit it is a diameter of
311.1mm；In tenth step, horizontal engineering well two drive a well eye use drill bit a diameter of 215.9mm.
Preferably, in second step, straight well one open sleeve pipe by several external diameters be 339.7mm, wall thickness 9.65mm, material be
The petroleum casing pipe of J55 grade of steels is spliced；
In 5th step, straight well two open sleeve pipe by several external diameters be 177.8mm, wall thickness 8.05mm, material be J55 grade of steels
Petroleum casing pipe be spliced；
In 8th step, horizontal engineering well one open sleeve pipe by several external diameters be 244.5mm, wall thickness 8.94mm, material be
The petroleum casing pipe of J55 grade of steels is spliced；
In 11st step, horizontal engineering well two open sleeve pipe by several external diameters be 139.7mm, wall thickness 7.72mm, material
Petroleum casing pipe for J55 grade of steels is spliced.
Preferably, the 5th step, straight well two open that sleeve pipe drives sleeve pipe including the first straight well two, the second straight well two drives sleeve pipe and glass
Steel sleeve, wherein, the first straight well two is driven sleeve pipe and is arranged on from ground to straight well and at horizontal engineering well docking port；Glass reinforced plastic sleeve
It is arranged at straight well and horizontal engineering well docking port；Second straight well two is driven sleeve pipe and is arranged on from straight well and horizontal engineering well docking port
Place to straight well two drives a well the bottom of eye.
Preferably, the first straight well two drives sleeve pipe and is enclosed with polyurethane foam heat insulation material, and poly- ammonia close to the one end on ground
The packages length of ester cellular insulant is no more than the length that straight well one drives sleeve pipe.
Preferably, in the tenth step, when the horizontal engineering well two of carry out is opened, crept into first with plumbness to kickoff point (KOP), it
Crept into afterwards with the deflecting the boring rate of engineering design to landing point, be finally drilled into and be docked and connected a little, and with the glass reinforced plastic sleeve of straight well
It is docked and connected.
Preferably, the well of landing point is horizontal, and when being connected with being docked and connected, well is horizontal.
Preferably, the location determining method of kickoff point (KOP) and landing point：Horizontal engineering well two eye that drives a well uses standardCircular arc rail
Road, from the symmetry of circular arc, the vertical depth TVD of connection docking point and kickoff point (KOP)15-TVD13With landing point and kickoff point (KOP)
Horizontal displacement difference VS14-VS13Relation of equal quantity, i.e. TVD be present15-TVD13=VS14-VS13；
If the distance between straight well well head and horizontal engineering well well head are d,
If 250m≤d≤346m,：190≤(TVD15-TVD13=VS14-VS13)≤d-60；
If d>346m, then：190≤(TVD15-TVD13=VS14-VS13)≤286。
Preferably, in the 12nd step, when horizontal engineering well two opens well cementation, mud is filled in straight well pit shaft, first closes installation
Be used for the pressure control device valve of control pressure in straight well well head, when in horizontal engineering well shaft cement mortar from being docked and connected a little
Position drive a well eye into horizontal engineering well two and when horizontal engineering well two opens the annular space between sleeve pipe, open straight well well head pressure control
Device valve processed, by straight well pit shaft calculation of capacity, the mud in more than 50m straight well pit shafts is discharged, cement sealing is docked and connected
Straight well pit shaft at point.
Preferably, when horizontal engineering well and straight well are docked and connected, using directly docked with glass reinforced plastic sleeve or
Glass reinforced plastic sleeve is docked after manufacturing a cave, wherein, the position in the cave below the circle of shale layer top at 1.5~2m from opening
Begin, diameter 500mm, 2~3m of height.
Compared with prior art, the beneficial effects of the invention are as follows：
The construction method of the casing programme of the horizontal docking geothermal well of a kind of heat exchange type provided by the invention, first in ground surface
Perforate, pierce in stable clay layer or below bedrock surface, form straight well one and drive a well eye, then complete straight well one and drive a well eye well cementation,
Then two are proceeded by open from the drive a well bottom of eye of straight well one, until piercing thickness in purpose heat reservori>6m any shale layer
Hereinafter, form straight well two to drive a well eye, then complete straight well two and drive a well the well cementation of eye；Then from away from straight well well head center at least
250m floor surface position proceeds by perforate, pierces in stable clay layer or below bedrock surface, forms horizontal engineering well one
Drive a well eye, and then the horizontal engineering well one of completion drives a well eye well cementation, is then proceeded by from the drive a well bottom of eye of horizontal engineering well one
Two open, and the horizontal engineering well two of formation drives a well eye, while the horizontal engineering well two of completion drives a well the well cementation of eye, and are driven a well eye with straight well two
It is being docked and connected, and then is causing horizontal engineering well shaft to form U-typed pipeline with straight well pit shaft slitless connection, using pit shaft in itself
As heat exchanger channels, section surface area is big, and amount of heat exchange water is big, and heat exchange amount is big；Solves existing mid-deep strata geothermal resource of hydrothermal type
The problem of development scheme " both having taken heat or water intaking ", it is truly realized the purpose of " only taking heat not fetch water "；Meanwhile the present invention only uses
Cold and hot water circulation realizes heat exchange, not groundwater abstraction, water conservation, while not polluted underground water, green.
Further, it is 177.8mm that straight well two, which opens sleeve outer, and it is 139.7mm that horizontal engineering well two, which opens sleeve outer, two
After well connection docking, horizontal engineering well two is opened sleeve pipe cross section and can be completely embedded among the longitudinal section that straight well two drives sleeve pipe, matches somebody with somebody
Cement is cemented the well, and realization insulates completely with stratum, and pit shaft will not produce hydraulic connection with heat reservori.
Further, straight well two opens that sleeve pipe drives sleeve pipe including the first straight well two, the second straight well two drives sleeve pipe and fiber glass reinforced plastic cover
Pipe, and glass reinforced plastic sleeve is arranged at straight well and horizontal engineering well docking port.Using the purpose of glass reinforced plastic sleeve, first, its shearing resistance
Intensity is weak compared with steel sleeve, is easy to be drilled by drill bit；Second, itself does not have magnetic, also it is unaffected by the magnetic field, will when being docked and connected
Receive in the measuring instrument tripping in glass reinforced plastic sleeve of strong magnetic signal, can uninterruptedly receive the rotation that strong magnetic joint is sent at drill bit
Turn magnetic signal, ensure being smoothed out for connection butt-joint operation.
Further, straight well two is opened cannula tip and wrapped up using insulation material, can effectively reduce in straight well pit shaft hot water with
The heat exchange of low temperature formation, improve well head leaving water temperature.
Further, horizontal engineering well inclination section uses 6~9 °/30m build angle rate, and well can be made to keep excellent song
Degree, the pressure of the drill that one side ground is transmitted lose smaller in inclination section, it is ensured that the pressure of the drill is smoothly delivered at drill bit；The opposing party
Face, injury of the drilling tool in well internal rotation to well and drilling tool in itself is smaller, ensure that well and the safety of down-hole equipment.
Further, the casing programme in the present invention, is opened mainly for 1500~3000m mid-deep strata geothermal resource of hydrothermal types
Hair, its heat reservori temperature are generally 50~200 DEG C.The horizontal well drilling eye in this kind of heat reservori rock stratum, rock is by Low temperature drilling fluid
Effect of being expanded with heat and contract with cold caused by influence is smaller, meanwhile, horizontal well two drives a well outside diameter that eye uses as 215.9mm, creeps into
The stability of well is preferable in journey, coordinates the technologies such as mud off, can guarantee that hole stability safety.
Further, the annular space between pit shaft and heat reservori all realizes cement sealing, while the point selection that will be docked and connected exists
In shale layer, it ensure that pit shaft completely cuts off completely with aqueous heat reservori, pit shaft is inside and outside to be not present hydraulic connection.
Further, the eye that drives a well of two due to the horizontal engineering well in the present invention includes tilting section, and the structure is adapted to urban district
Used etc. the area for having place size limitation, also be adapted for field locations of the two well well heads distance no more than 1500m and use.
Brief description of the drawings
Fig. 1 is casing programme schematic diagram；
Wherein, 1, the eye that drives a well that eye 2, straight well one drive sleeve pipe 3, straight well one opens cementing concrete 4, straight well two drives a well of straight well one
5a, the first straight well two open sleeve pipe 5b, the second straight well two is opened sleeve pipe 6, glass reinforced plastic sleeve 7, insulation material 8, straight well two and opened admittedly
Well cement 9, horizontal engineering well one drive a well, and eye 10, horizontal engineering well one drive sleeve pipe 11, horizontal engineering well one opens cementing concrete
12nd, horizontal engineering well two drive a well eye 13, kickoff point (KOP) 14, landing point 15, be docked and connected a little 16, horizontal engineering well two drive sleeve pipe
17th, horizontal engineering well two opens cementing concrete.
Embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
As shown in figure 1, the present invention provides a kind of casing programme of the horizontal docking geothermal well of heat exchange type, including straight well and level
Engineering well, wherein, straight well and horizontal engineering well are docked in bottom and connected, overall U-shaped structure.
Wherein, straight well including straight well one drives a well eye 1 and straight well two drives a well eye 4, and the eye 1 that drives a well of straight well one is opened in ground to steady
Determine between clay layer or basement rock, straight well two drive a well eye 4 be opened in straight well one drive a well eye 1 shaft bottom to some thickness of purpose heat reservori
>Between 6m shale layer.
Straight well one drives a well and is provided with straight well one from the drive a well bottom of eye 1 of ground to straight well one and opens sleeve pipe 2, straight well one in eye 1
Driving sleeve pipe 2 includes the petroleum casing pipe that several external diameters are 339.7mm, wall thickness 9.65mm, material are J55 grade of steels, and oil set
Pipe is connected through a screw thread between any two；Straight well one drives a well the borehole wall of eye 1 and straight well one open opened filled with straight well one between sleeve pipe 2 it is solid
Well cement 3.
Straight well two drives a well and is provided with straight well two from the drive a well bottom of eye 4 of ground to straight well two and drives sleeve pipe in eye 4, wherein, directly
Well two opens that sleeve pipe opens sleeve pipe 5a including the first straight well two, the second straight well two opens sleeve pipe 5b and glass reinforced plastic sleeve 6, and the first straight well two is opened
Sleeve pipe 5a is arranged on from ground to straight well and at horizontal engineering well docking port；Glass reinforced plastic sleeve 6 is arranged on straight well and horizontal engineering
Jing Duijiekouchu；Second straight well two, which is opened sleeve pipe 5b and is arranged on from straight well and horizontal engineering well docking port to straight well two, to drive a well eye 4
Bottom；First straight well two opens sleeve pipe 5a and glass reinforced plastic sleeve 6, the straight well two of glass reinforced plastic sleeve 6 and second are opened between sleeve pipe 5b
It is connected through a screw thread.
Specifically, the first straight well two open sleeve pipe 5a and the second straight well two open sleeve pipe 5b structure it is identical, by least one
The petroleum casing screw that external diameter is 177.8mm, wall thickness 8.05mm, material are J55 grade of steels is formed by connecting；Glass reinforced plastic sleeve 6
External diameter is 177.8mm, length 8m.
The bottom of straight well two opens that sleeve pipe drives sleeve pipe 2 with straight well one respectively, straight well two drives a well the borehole wall of eye 4 and straight well two drives a well eye 4
Cementing concrete 8 is opened between portion filled with straight well two；Meanwhile first straight well two open sleeve pipe 5a top (close to ground one end)
Polyurethane foam heat insulation material 7 is enclosed with, of length no more than straight well one of polyurethane foam heat insulation material 7 opens the length of sleeve pipe 2.
Horizontal engineering well including horizontal engineering well one drives a well eye 9 and horizontal engineering well two drives a well eye 12, wherein, horizontal engineering
The eye 9 that drives a well of well one is opened in ground to stablizing between clay layer or basement rock, and horizontal engineering well two eye 12 that drives a well is opened in horizontal work
The drive a well bottoms of eye 9 of Cheng Jingyi connect to shale layer and with the eye 4 that drives a well of straight well two.
Wherein, horizontal engineering well one drives a well and the drive a well bottom of eye 9 of ground to horizontal engineering well one is provided with level in eye 9
Engineering well one drives sleeve pipe 10, horizontal engineering well one open sleeve pipe 10 by several external diameters be 244.5mm, wall thickness 8.94mm, material
Petroleum casing pipe for J55 grade of steels is spliced；Meanwhile horizontal engineering well one is opened sleeve pipe 10 and horizontal engineering well one and driven a well eye 9
Between the borehole wall cementing concrete 11 is opened filled with horizontal engineering well one.
Horizontal engineering well two drives a well and the drive a well bottom of eye 12 of ground to horizontal engineering well two is provided with horizontal work in eye 12
Cheng Jing bis- drives sleeve pipe 16, horizontal engineering well two open sleeve pipe 16 by several external diameters be 139.7mm, wall thickness 7.72mm, material be
The petroleum casing pipe of J55 grade of steels is spliced；It is (floating that the bottom that horizontal engineering well two drives sleeve pipe 16 is connected with drillable float collar, float shoe
Hoop, float shoe prevent the annex of cement mortar adverse current to be arranged on sleeve bottom, during for cementing the well, and to be bored after well cementation logical to be formed
Road), with being threadedly coupled between sleeve pipe and between sleeve pipe and drillable float collar float plug.
Meanwhile horizontal engineering well two opens that sleeve pipe 16 and horizontal engineering well two drive a well the borehole wall of eye 12 and horizontal engineering well one is opened
Between sleeve pipe 10 cementing concrete 17 is opened filled with horizontal engineering well two.
The present invention also provides a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type, including following step
Suddenly：
The first step, since floor surface, perforate is carried out using a diameter of 444.5mm drill bit, drills topsoil and pine
Layer is dissipated, until pierce in stable clay layer or below bedrock surface, straight well one is formed and drives a well eye 1；
Second step, driven a well in straight well one and straight well one is placed in eye 1 drive sleeve pipe 2；
3rd step, using conventional cementing technology to straight well one drive sleeve pipe 2 and straight well one drive a well eye 1 the borehole wall between fill it is straight
Well one opens cementing concrete 3, until straight well one is opened cementing concrete 3 and returned to ground；
4th step, since straight well one drive a well eye 1 bottom, using a diameter of 241.3mm drill bit two open, until
Pierce thickness in purpose heat reservori>Below 6m any shale layer, form straight well two and drive a well eye 4；
5th step, drive a well eye 4 in straight well two and straight well one is opened and straight well two is placed in sleeve pipe 2 drives sleeve pipe, while ensure straight well
Two glass reinforced plastic sleeves 6 opened in sleeve pipe are placed in shale layer, and open sleeve pipe 5a top parcel polyurethane foam in the first straight well two
Insulation material 7；
6th step, using dual density cement mortar it is disposable on return cementing technology and drive sleeve pipe to straight well two respectively and opened with straight well two
Filling straight well two opens cementing concrete 8 between the borehole wall of well 4 and straight well one drive sleeve pipe 2, until straight well two is opened cementing concrete 8 and returned to ground
Face；
7th step, since floor surface, perforate is carried out using a diameter of 311.1mm drill bit, drills topsoil and pine
Layer is dissipated, until pierce in stable clay layer or below bedrock surface, the horizontal engineering well one of formation drives a well eye 9；
8th step, sleeve pipe 10 is driven in the horizontal engineering well one horizontal engineering well one of placement in eye 9 that drives a well；
9th step, to horizontal engineering well one sleeve pipe 10 is driven using conventional cementing technology and horizontal engineering well one drives a well eye 9
Fill level engineering well one opens cementing concrete 11 between the borehole wall, until horizontal engineering well one is opened cementing concrete 11 and returned to ground；
Tenth step, since horizontal engineering well one drive a well eye 9 bottom, using a diameter of 215.9mm drill bits two open,
Wherein, crept into first with plumbness to kickoff point (KOP) 13, crept into landing point 14 (with the deflecting the boring rate of engineering design afterwards
Land point well is horizontal), finally keep well horizontality to be drilled into and be docked and connected a little 15, realize and the fiberglass of straight well
Sleeve pipe 6 is docked and connected (such as fiber glass reinforced plastic cover pipeline section has carried out drawing cave processing, then is docked and connected with cave).Wherein, kickoff point (KOP)
13rd, the position of landing point 14 is according to thickness in straight well purpose heat reservori>6m mud stone layer depth, straight well and horizontal engineering well well head
The distance between and horizontal engineering well two open up meter deflecting the boring rate determine；
Horizontal engineering well two open make deflecting the boring rate can not be too small, if deflecting the boring rate<6 °/30m, then angle buildup interval is too
It is long, too many horizontal displacement on the one hand has been consumed in landing point (14) position, landing point (14) and connectivity points may be caused
(15) distance is less than 60m, it is difficult to which be docked and connected success；On the other hand, the working time of underground deflecting tool is also increased, is increased
Add operating expenses；
Horizontal engineering well two drives a well a build angle rate can not be too big, if deflecting the boring rate>9 °/30m, inclination section well can be caused
Eye curvature is too big, and increase down-hole equipment while also results in horizontal engineering well two and opens sleeve pipe tripping in and be stranded in the work risk of this section
Difficulty, produce situation not in place under sleeve pipe.Therefore optimal well build angle rate is 6~9 °/30m.
The horizontal exploitation standard of engineering well twoArc orbit.From the symmetry of circular arc, kickoff point (KOP) (13) is with connecting pair
The vertical depth TVD of contact (15)15-TVD13With kickoff point (KOP) (13) and the horizontal displacement difference VS of landing point (14)14-VS13Equivalent be present
Relation.Two optimal 6~9 °/30m of well build angle rate of exploitation, vertical depth and horizontal displacement caused by inclination section are 190~286m.
If the distance between two well well heads are d, during due to being docked and connected, at least between landing point (14) and connectivity points (15)
60m, thus have following relation：
If 250m≤d≤346m,：190≤TVD15-TVD13≤d-60；190≤VS14-VS13≤d-60
If d>346m, then：190≤TVD15-TVD13≤286；190≤VS14-VS13≤286；
11st step, drive a well eye 12 in horizontal engineering well two and horizontal engineering well one opens the horizontal engineering well of placement in sleeve pipe 10
Two drive sleeve pipe 16；
12nd step, using dual density cement mortar it is disposable on return cementing technology and open sleeve pipe 16 and water to horizontal engineering well two
Flat engineering well two drive a well eye 12 and horizontal engineering well one drive sleeve pipe 10 between fill level engineering well two open cementing concrete 17, until
Horizontal engineering well two is opened cementing concrete 17 and returned to ground；
When horizontal engineering well two opens well cementation, mud is filled in straight well pit shaft, straight well well head is provided with pressure control device, pressure
Force control device is connected with pressure control device valve, during beginning, first closing presure control device valve, when horizontal engineering well well
Cement mortar drives a well into horizontal engineering well two eye 12 from a little 15 positions that are docked and connected in cylinder and horizontal engineering well two is opened between sleeve pipe 16
Annular space when, open straight well pressure control device valve, by straight well pit shaft calculation of capacity, discharge more than 50m straight well pit shafts
Interior mud, cement sealing is set to be docked and connected a little next section of straight well pit shaft on 15, to improve the cement sealing quality of the position；
13rd step, horizontal engineering well two are opened after cementing concrete 17 reaches the cementing time, tripping in drilling tool in horizontal engineering well
Residual cement and horizontal engineering well two open the casing hardware of the end of sleeve pipe 16 in cleaning pit shaft, until two well shafts communicate, straight well
Residual cement in interior tripping in drilling tool cleaning pit shaft, until straight well shaft bottom；
14th step, well-flushing is carried out to straight well and horizontal engineering well shaft, water sand removal is washed till and uses up.
When horizontal engineering well and straight well are docked and connected, it is docked and connected technique according to glass reinforced plastic sleeve, then fiber glass reinforced plastic cover
Pipe 6 is placed in thickness>In 6m shale layers, hoop is terminated thereon and is higher by shale layer top circle 1m or so, is no longer separately dealt with；According to cave
Be docked and connected technique, then glass reinforced plastic sleeve 6 is placed in thickness>In 6m shale layers, hoop is terminated thereon and is higher by shale layer top circle 1m or so,
Straight well two is opened after cementing concrete reaches the cementing time, Special cutting tool under lower going-into-well in straight well pit shaft, from shale layer top circle with
Start at lower 1.5~2m, cut open glass reinforced plastic sleeve 6 from top to bottom, form diameter 500mm, 2~3m of height cylindrical cave.
Claims (10)
1. the construction method of the casing programme of the horizontal docking geothermal well of a kind of heat exchange type, it is characterised in that comprise the following steps：
The first step, perforate is proceeded by from floor surface, drills topsoil and unconsolidated formation, until piercing in stable clay layer or base
Below scar, form straight well one and drive a well eye (1)；
Second step, driven a well in straight well one and be put into straight well one in eye (1) and drive sleeve pipe (2)；
3rd step, to straight well one drive sleeve pipe (2) and straight well one drive a well eye (1) the borehole wall between filling straight well one open cementing concrete
(3), until straight well one is opened cementing concrete (3) and returned to ground；
4th step, proceed by two from the drive a well bottom of eye (1) of straight well one and open, until piercing thickness in purpose heat reservori is more than 6m
Any shale layer below, form straight well two and drive a well eye (4)；
5th step, drive a well eye (4) in straight well two and straight well one is opened and straight well two is placed in sleeve pipe (2) drives sleeve pipe；
6th step, drive sleeve pipe to straight well two and straight well two drive a well eye (4) and straight well one open filling straight well two between sleeve pipe (2) open it is solid
Well cement (8), until straight well two is opened cementing concrete (8) and returned to ground；
7th step, perforate is proceeded by from the floor surface position away from straight well well head center at least 250m, drills topsoil and pine
Layer is dissipated, until pierce in stable clay layer or below bedrock surface, the horizontal engineering well one of formation drives a well eye (9)；
8th step, sleeve pipe (10) is driven in the horizontal engineering well one horizontal engineering well one of eye (9) interior placement that drives a well；
9th step, to horizontal engineering well one drive sleeve pipe (10) and horizontal engineering well one drive a well eye (9) the borehole wall between fill level
Engineering well one opens cementing concrete (11), until horizontal engineering well one is opened cementing concrete (11) and returned to ground；
Tenth step, proceed by two from the drive a well bottom of eye (9) of horizontal engineering well one and open, the horizontal engineering well two of formation drives a well eye
(12), wherein, horizontal engineering well two eye (12) that drives a well includes vertical section, inclination section and horizontal segment, and is followed successively by from top to bottom vertical
Straight section, inclination section and horizontal segment, one end and the straight well two of horizontal segment drive a well eye (4) and straight well two is driven sleeve pipe and is docked and connected；
11st step, drive a well eye (12) in horizontal engineering well two and horizontal engineering well one is opened and horizontal engineering well is placed in sleeve pipe (10)
Two drive sleeve pipe (16)；
12nd step, opens that sleeve pipe (16) and horizontal engineering well two drive a well eye (12) and horizontal engineering well one is opened to horizontal engineering well two
Fill level engineering well two opens cementing concrete (17) between sleeve pipe (10), until horizontal engineering well two open cementing concrete (17) return to
Ground；
13rd step, horizontal engineering well two are opened after cementing concrete (17) reaches the cementing time, and tripping in drilling tool is swept in horizontal engineering well
Except residual cement in pit shaft and horizontal engineering well two open the casing hardware of sleeve pipe (16) end, until horizontal engineering well and straight well
Pit shaft communicates；Meanwhile tripping in drilling tool clears away residual cement in pit shaft into straight well pit shaft, until straight well shaft bottom；
14th step, well-flushing is carried out to straight well and horizontal engineering well shaft, water sand removal is washed till and uses up.
2. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, its feature
It is：In the first step, straight well one drive a well eye use drill bit a diameter of 444.5mm；In 4th step, straight well two drive a well eye use
Drill bit a diameter of 241.3mm；In 7th step, horizontal engineering well one drive a well eye use drill bit a diameter of 311.1mm；The
In ten steps, horizontal engineering well two drive a well eye use drill bit a diameter of 215.9mm.
3. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, its feature
It is：In second step, straight well one open sleeve pipe (2) by several external diameters be 339.7mm, wall thickness 9.65mm, material be J55 grade of steels
Petroleum casing pipe be spliced；
In 5th step, straight well two open sleeve pipe by several external diameters be 177.8mm, the stone that wall thickness 8.05mm, material are J55 grade of steels
Tubing and casing is spliced；
In 8th step, horizontal engineering well one open sleeve pipe (10) by several external diameters be 244.5mm, wall thickness 8.94mm, material be
The petroleum casing pipe of J55 grade of steels is spliced；
In 11st step, horizontal engineering well two open sleeve pipe (16) by several external diameters be 139.7mm, wall thickness 7.72mm, material
Petroleum casing pipe for J55 grade of steels is spliced.
4. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, its feature
It is：5th step, straight well two open that sleeve pipe drives sleeve pipe (5a) including the first straight well two, the second straight well two opens sleeve pipe (5b) and fiberglass
Sleeve pipe (6), wherein, the first straight well two is driven sleeve pipe (5a) and stretched to from ground at straight well and horizontal engineering well docking port；Fiberglass
Sleeve pipe (6) is placed at straight well and horizontal engineering well docking port；Second straight well two drives sleeve pipe (5b) from straight well and horizontal engineering well pair
Interface stretches to straight well two and driven a well the bottoms of eye (4).
5. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 4, its feature
It is：First straight well two drives sleeve pipe (5a) and is enclosed with polyurethane foam heat insulation material (7), and polyurethane foam close to the one end on ground
The packages length of foam insulation material (7) is no more than the length that straight well one opens sleeve pipe (2).
6. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, its feature
It is：In tenth step, when the horizontal engineering well two of carry out is opened, crept into first with plumbness to kickoff point (KOP) (13), afterwards with work
The deflecting the boring rate of journey design is crept into landing point (14), is finally drilled into the point (15) that is docked and connected, and with the fiber glass reinforced plastic cover of straight well
Pipe (6) is docked and connected, wherein, the deflecting the boring rate of engineering design is 6~9 °/30m.
7. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 6, its feature
It is：The well of landing point (14) is horizontal, and when being connected with the point (15) that is docked and connected, well is horizontal.
8. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 6, its feature
It is, the location determining method of kickoff point (KOP) (13) and landing point (14)：
Horizontal engineering well two eye that drives a well uses standardArc orbit, from the symmetry of circular arc, connection docking point (15) is with making
The vertical depth TVD of oblique point (13)15-TVD13With landing point (14) and the horizontal displacement difference VS of kickoff point (KOP) (13)14-VS13Equivalent be present
Relation, i.e. TVD15-TVD13=VS14-VS13；
If the distance between straight well well head and horizontal engineering well well head are d,
If 250m≤d≤346m,：190≤(TVD15-TVD13=VS14-VS13)≤d-60；
If d>346m, then：190≤(TVD15-TVD13=VS14-VS13)≤286。
9. a kind of construction method of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, its feature
It is：In 12nd step, when horizontal engineering well two opens well cementation, mud is filled in straight well pit shaft, first closes and is arranged on straight well well head
For the pressure control device valve of control pressure, when in horizontal engineering well shaft cement mortar from the position for point (15) that are docked and connected
Eye (12) is driven a well into horizontal engineering well two and when horizontal engineering well two opens the annular space between sleeve pipe (16), open straight well well head pressure
Control device valve, by straight well pit shaft calculation of capacity, the mud in more than 50m straight well pit shafts is discharged, makes cement sealing in succession
The straight well pit shaft at logical point (15) place.
A kind of 10. construction party of the casing programme of the horizontal docking geothermal well of heat exchange type according to claim any one of 4-9
Method, it is characterised in that：When horizontal engineering well and straight well are docked and connected, using directly being docked with glass reinforced plastic sleeve (6) or
Docked after glass reinforced plastic sleeve (6) manufactures a cave, wherein, the position in the cave from 1.5 below the circle of shale layer top~
Start at 2m, diameter 500mm, 2~3m of height.
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| CN108131852A (en) * | 2018-01-03 | 2018-06-08 | 西南石油大学 | A kind of novel middle low temperature geothermal well |
| CN108224819A (en) * | 2018-01-03 | 2018-06-29 | 西南石油大学 | Multi-layer U-shape geothermal well and recovery method |
| CN108954878A (en) * | 2018-09-05 | 2018-12-07 | 陕西延长石油国际勘探开发工程有限公司 | A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method |
| CN111043780A (en) * | 2018-10-11 | 2020-04-21 | 中国石油化工集团公司 | Hydrothermal multi-branch directional mining and grouting geothermal well and construction method |
| CN111456720A (en) * | 2020-03-24 | 2020-07-28 | 中国地质科学院勘探技术研究所 | Heat exchange isolation mining method for geothermal communication well |
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| 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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| CN108954878A (en) * | 2018-09-05 | 2018-12-07 | 陕西延长石油国际勘探开发工程有限公司 | A kind of mid-deep strata underground pipe horizontal well heat exchange structure and method |
| CN111043780A (en) * | 2018-10-11 | 2020-04-21 | 中国石油化工集团公司 | Hydrothermal multi-branch directional mining and grouting geothermal well and construction method |
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| CN111456720B (en) * | 2020-03-24 | 2023-05-23 | 中国地质科学院勘探技术研究所 | Heat exchange isolation exploitation method for geothermal communication well |
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| CN112303942A (en) * | 2020-09-23 | 2021-02-02 | 中国地质科学院勘探技术研究所 | Hot dry rock non-fracturing butt well heat taking device |
| CN112303942B (en) * | 2020-09-23 | 2021-11-23 | 中国地质科学院勘探技术研究所 | Hot dry rock non-fracturing butt well heat taking device |
| CN114016991A (en) * | 2021-09-16 | 2022-02-08 | 西安交通大学 | Method for determining well body structure of butt joint well based on geothermal field distribution characteristics |
| CN114016991B (en) * | 2021-09-16 | 2022-10-21 | 西安交通大学 | Method for determining well body structure of butt joint well based on geothermal field distribution characteristics |
| CN114482920A (en) * | 2021-12-20 | 2022-05-13 | 中煤地质集团有限公司 | Novel geothermal well transformation method |
| CN114482920B (en) * | 2021-12-20 | 2023-08-15 | 中煤地质集团有限公司 | Novel geothermal well reconstruction method |
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