CN107387056A - A kind of casing programme of the horizontal docking geothermal well of heat exchange type - Google Patents
A kind of casing programme of the horizontal docking geothermal well of heat exchange type Download PDFInfo
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- CN107387056A CN107387056A CN201710726447.0A CN201710726447A CN107387056A CN 107387056 A CN107387056 A CN 107387056A CN 201710726447 A CN201710726447 A CN 201710726447A CN 107387056 A CN107387056 A CN 107387056A
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- 238000003032 molecular docking Methods 0.000 title claims abstract description 31
- 239000011152 fibreglass Substances 0.000 claims description 21
- 239000004927 clay Substances 0.000 claims description 8
- 239000012774 insulation material Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 8
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 6
- 239000011496 polyurethane foam Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 28
- 239000003673 groundwater Substances 0.000 abstract description 3
- 239000004568 cement Substances 0.000 description 9
- 229910000831 Steel Inorganic materials 0.000 description 7
- 238000005553 drilling Methods 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 239000011083 cement mortar Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000003208 petroleum Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 2
- 235000011613 Pinus brutia Nutrition 0.000 description 2
- 241000018646 Pinus brutia Species 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005338 heat storage Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000004575 stone 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
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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
- 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
- E21B36/00—Heating, cooling or insulating arrangements for boreholes or wells, e.g. for use in permafrost zones
- E21B36/003—Insulating arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24T—GEOTHERMAL COLLECTORS; GEOTHERMAL SYSTEMS
- F24T10/00—Geothermal collectors
- F24T10/10—Geothermal collectors with circulation of working fluids through underground channels, the working fluids not coming into direct contact with the ground
-
- 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)
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
A kind of casing programme of the horizontal docking geothermal well of heat exchange type provided by the invention, horizontal engineering well shaft form U-typed pipeline with straight well pit shaft slitless connection, and by the use of 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；Solve the problems, such as existing mid-deep strata geothermal resource of hydrothermal type development scheme " both having taken heat or water intaking ", be truly realized the purpose of " only taking heat not fetch water "；Meanwhile the present invention only realizes heat exchange using cold and hot water circulation, 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 horizontal casing programme for docking geothermal well of heat exchange type.
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 casing programme of the horizontal docking geothermal well of heat exchange type, solves existing middle depth
The problem of layer geothermal resource of hydrothermal type development scheme " both having taken heat or water intaking ", it is truly realized the purpose of " only taking heat not fetch water ".
In order to achieve the above object, the technical solution adopted by the present invention is：
A kind of casing programme of the horizontal docking geothermal well of heat exchange type provided by the invention, including straight well and horizontal engineering well,
Straight well and horizontal engineering well dock in bottom to be connected, overall U-shaped structure.
Preferably, straight well including straight well one drives a well eye and straight well two drives a well eye, and the eye 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 be opened in straight well one drive a well eye shaft bottom into purpose heat reservori thickness be more than
Between 6m any shale layer.
Preferably, the intraocular that drives a well of straight well one is provided with straight well one and drives sleeve pipe from the drive a well bottom of eye of ground to straight well one；
The intraocular that drives a well of straight well two is provided with straight well two and drives sleeve pipe from the drive a well bottom of eye of ground to straight well two, wherein, 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 reinforced plastic sleeve, and the first straight well two is driven sleeve pipe and set
Put from ground to straight well and at horizontal engineering well docking port；Glass reinforced plastic sleeve is arranged on straight well and horizontal engineering well docking port
Place；Second straight well two opens the bottom that sleeve pipe is arranged on from straight well and horizontal engineering well docking port to straight well two eye that drives a well.
Preferably, straight well one drives a well the borehole wall of eye and straight well one is opened and opens cementing concrete filled with straight well one between sleeve pipe；Directly
It is filled between the bottom of well two opens that sleeve pipe drives sleeve pipe with straight well one respectively, straight well two drives a well a borehole wall and straight well two drives a well eye
Straight well two opens cementing concrete.
Preferably, the first straight well two drives sleeve pipe and is enclosed with polyurethane foam heat insulation material, polyurethane close to the one end on ground
Of length no more than straight well one of cellular insulant opens the length of sleeve pipe.
Preferably, horizontal engineering well including horizontal engineering well one drives a well eye and horizontal engineering well two drives a well eye, wherein, it is horizontal
The eye that drives a well of engineering well one is opened in ground to stablizing between clay layer or basement rock, and horizontal engineering well two eye that drives a well is opened in horizontal work
The drive a well bottoms of eye of Cheng Jingyi connect to shale layer and with the eye that drives a well of straight well two.
Preferably, horizontal engineering well two eye 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, 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.
Preferably, horizontal engineering well one intraocular that drives a well is provided with level from the drive a well bottom of eye of ground to horizontal engineering well one
Engineering well one drives sleeve pipe；Horizontal engineering well two intraocular that drives a well is provided with level from the drive a well bottom of eye of ground to horizontal engineering well two
Engineering well two drives sleeve pipe.
Preferably, horizontal engineering well one drive sleeve pipe and horizontal engineering well one drive a well eye the borehole wall between be filled with horizontal engineering
Well one opens cementing concrete；Horizontal engineering well two opens that sleeve pipe and horizontal engineering well two drive a well the borehole wall of eye and horizontal engineering well one opens set
Between pipe cementing concrete is opened filled with horizontal engineering well two.
Preferably, when straight well and horizontal engineering well are docked and connected in bottom, using glass reinforced plastic sleeve docking or cave pair
Connect.
Compared with prior art, the beneficial effects of the invention are as follows：
A kind of casing programme of the horizontal docking geothermal well of heat exchange type provided by the invention, horizontal engineering well shaft and straight well well
Cylinder slitless connection forms U-typed pipeline, and by the use of pit shaft in itself as heat exchanger channels, section surface area is big, and amount of heat exchange water is big, heat exchange
Amount is big；Solve the problems, such as existing mid-deep strata geothermal resource of hydrothermal type development scheme " both having taken heat or water intaking ", be truly realized " only
Take heat do not fetch water " purpose；Meanwhile the present invention only realizes heat exchange using cold and hot water circulation, groundwater abstraction, protection water do not provide
Source, while not polluted underground water, it is green.
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, 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.
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.
To solve the above problems, first developing horizontally-butted wells for mid-deep strata geothermal resource of hydrothermal type, straight well is utilized
Pit shaft after being docked and connected with horizontal engineering well forms U-typed pipeline, at the same using steel sleeve coordinate well cementing of cement and stratum every
Absolutely, really realize and develop mid-deep strata geothermal resource of hydrothermal type in a manner of " only taking heat not fetch water ".
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；Using the purpose of glass reinforced plastic sleeve, first, its shearing strength is weak compared with steel sleeve, it is easy to drilled
Head drills；Second, itself does not have magnetic, also it is unaffected by the magnetic field, when being docked and connected, the measuring instrument of strong magnetic signal will be received
In tripping in glass reinforced plastic sleeve, the rotation magnetic signal that strong magnetic joint is sent at drill bit can be uninterruptedly received, ensures connection docking
Operation is smoothed out.
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；
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, so that two wells connect
After logical 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, hydrous water
Mud is cemented the well, and realization insulates completely with stratum, and pit shaft will not produce hydraulic connection with heat reservori.
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, using 6~9 °/30m deflecting
Rate, can make well keep excellent curvature, and the pressure of the drill that one side ground is transmitted loses smaller in inclination section, it is ensured that the pressure of the drill is suitable
Profit is delivered at drill bit；On the other hand, injury of the drilling tool in well internal rotation to well and drilling tool in itself is smaller, ensure that well
The safety of eye and down-hole equipment；
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, with straight well pit shaft calculation of capacity, release 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；Well
Annular space between cylinder and heat reservori all realizes cement sealing, while will be docked and connected point selection in shale layer, ensure that pit shaft
Completely cut off completely with aqueous heat reservori, pit shaft is inside and outside to be not present hydraulic connection.
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 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.
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.
Casing programme in the present invention, developed mainly for 1500~3000m mid-deep stratas geothermal resource of hydrothermal type, its heat storage
Layer temperature is generally 50~200 DEG C.The horizontal well drilling eye in this kind of heat reservori rock stratum, rock are influenceed caused by Low temperature drilling fluid
Effect of expanding with heat and contract with cold is smaller, meanwhile, horizontal well two drives a well outside diameter that eye uses as 215.9mm, well in drilling process
Stability is preferable, coordinates the technologies such as mud off, can guarantee that hole stability safety；Simultaneously as the horizontal engineering in the present invention
The eye that drives a well of the two of well includes tilting section, and the structure is adapted to the area use of urban district Deng You places size limitation, also is adapted for Liang Jingjing
Field locations of the mouth distance no more than 1500m use.
Claims (10)
- A kind of 1. casing programme of the horizontal docking geothermal well of heat exchange type, it is characterised in that：Including straight well and horizontal engineering well, straight well Dock and connect in bottom with horizontal engineering well, overall U-shaped structure.
- A kind of 2. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, it is characterised in that：Straight well bag Include that straight well one drives a well eye (1) and straight well two drives a well eye (4), the eye (1) that drives a well of straight well one is opened in ground to stablizing clay layer or base Between rock, straight well two drive a well eye (4) be opened in straight well one drive a well eye (1) shaft bottom into purpose heat reservori thickness more than 6m appoint Between meaning shale layer.
- A kind of 3. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 2, it is characterised in that：Straight well one Drive a well and be provided with straight well one from the drive a well bottom of eye (1) of ground to straight well one and drive sleeve pipe (2) in eye (1)；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 drives sleeve pipe (5a) including the first straight well two, the second straight well two drives sleeve pipe (5b) and glass reinforced plastic sleeve (6), and first is straight Well two is driven sleeve pipe (5a) and 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 At horizontal engineering well docking port；Second straight well two open sleeve pipe (5b) be arranged on from straight well with horizontal engineering well docking port to straight Well two drives a well the bottoms of eye (4).
- A kind of 4. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 3, it is characterised in that：Straight well one Drive a well the borehole wall of eye (1) and straight well one is opened and opens cementing concrete (3) filled with straight well one between sleeve pipe (2)；Straight well two drives sleeve pipe point Sleeve pipe (2) is not driven with straight well one, between the bottom of straight well two drives a well eye (4) borehole wall and straight well two drives a well eye (4) filled with straight Well two opens cementing concrete (8).
- A kind of 5. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 3, it is characterised in that：First is straight Well two drives sleeve pipe (5a) and is enclosed with polyurethane foam heat insulation material (7), polyurethane foam heat insulation material (7) close to the one end on ground Of length no more than straight well one open the length of sleeve pipe (2).
- A kind of 6. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 1, it is characterised in that：Horizontal work Cheng Jing including horizontal engineering well one drives a well eye (9) and horizontal engineering well two drives a well eye (12), wherein, horizontal engineering well one drives a well eye (9) ground is opened in stablizing between clay layer or basement rock, and horizontal engineering well two eye (12) that drives a well is opened in horizontal engineering well one The drive a well bottom of eye (9) connects to shale layer and with the eye (4) that drives a well of straight well two.
- A kind of 7. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 6, it is characterised in that：Horizontal work The eyes (12) that drive a well of Cheng Jing bis- include vertical section, inclination section and horizontal segment, and are followed successively by vertical section, inclination section and level from top to bottom Section, bottom 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.
- A kind of 8. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 6, it is characterised in that：Horizontal work Cheng Jingyi drives a well and is provided with horizontal engineering well one from the drive a well bottom of eye (9) of ground to horizontal engineering well one and drives sleeve pipe in eye (9) (10)；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).
- A kind of 9. casing programme of the horizontal docking geothermal well of heat exchange type according to claim 8, it is characterised in that：Horizontal work Between the borehole wall of Cheng Jingyi drives sleeve pipe (10) and horizontal engineering well one drives a well eye (9) cementing concrete is opened filled with horizontal engineering well one (11)；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 drives sleeve pipe (10) cementing concrete (17) is opened between filled with horizontal engineering well two.
- 10. a kind of casing programme of the horizontal docking geothermal well of heat exchange type according to claim any one of 3-9, its feature exist In：When straight well and horizontal engineering well are docked and connected in bottom, docked using glass reinforced plastic sleeve (6) docking or cave.
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Application publication date: 20171124 |