CN107605455A - One kind is based on the horizontal docking style geothermal well borehole track of straight well negative displacement and design method - Google Patents
One kind is based on the horizontal docking style geothermal well borehole track of straight well negative displacement and design method Download PDFInfo
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Abstract
One kind provided by the invention is based on the horizontal docking style geothermal well borehole track of straight well negative displacement and design method, comprises the following steps：The first step, the well head A of inclined shaft and the well head B of horizontal engineering well position and coordinate are determined according to the size of construction area, shape, distance d1 between the two is calculated according to well head A and well head B coordinate, the negative displacement offset distance d2 of slanted well bores track is determined further according to distance d1；Second step, determine the borehole track of straight well；3rd step, determine horizontal engineering well borehole track；The present invention opens the implementation of S402 sections by horizontal engineering well two, generate negative displacement offset distance d2, make d1+d2 >=250m, effectively increase underground connection docking distance, being smoothed out for two wells connection operation is ensure that, condition is created using horizontal docking style geothermal well technological development mid-deep strata geothermal resource of hydrothermal type for city narrow and small place；Solve the problems, such as existing 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 ".
Description
Technical field
The invention belongs to geothermal energy development technical field, is related to one kind and is based on the horizontal docking style geothermal well well of straight well negative displacement
Eye track and design 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 Finances：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 one kind to be based on the horizontal docking style geothermal well borehole track of straight well negative displacement and design
Method, solve the problems, such as existing geothermal resource of hydrothermal type development scheme " both having taken heat or water intaking ", be truly realized and " only take heat not
The purpose of water intaking ".
In order to achieve the above object, the technical solution adopted by the present invention is：
One kind provided by the invention is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement, including with
Lower step：
The first step, position and the seat of straight well well head and horizontal engineering well well head are determined according to the size of construction area, shape
Mark, according to the distance d1 of the coordinate of straight well well head and horizontal engineering well well head calculating between the two, determined further according to distance d1 oblique
The negative displacement offset distance d2 of well borehole track；
Second step, determine the borehole track of straight well, wherein, the borehole track of straight well including straight well one open borehole track S1 and
Straight well two opens borehole track S2：
A1, determine that straight well one opens borehole track S1：
Straight well one, which opens borehole track S1 and is drilled into straight well one from straight well well head, opens terminal, and is straight well borehole track；
A2, determine that straight well two opens borehole track S2：
Straight well two, which opens borehole track S2 and from straight well one opens terminal and be drilled into straight well two, opens terminal, and is straight well borehole track, together
When, this section is provided with the connection docking point connected with horizontal engineering well；
3rd step, horizontal engineering well borehole track is determined, wherein, horizontal engineering well borehole track includes horizontal engineering well one
Open borehole track S3 and horizontal engineering well two opens borehole track S4：
B1, determine that horizontal engineering well one opens borehole track S3：
Horizontal engineering well one, which opens borehole track S3 and is drilled into horizontal engineering well one from horizontal engineering well well head, opens terminal, and is straight
Well borehole track；
B2, determine that horizontal engineering well two opens borehole track S4：
Horizontal engineering well two open borehole track S4 include first paragraph S401, second segment S402, the 4th section S404 and the 5th section
S405, specifically：
First paragraph S401, which from horizontal engineering well one opens terminal and is drilled into horizontal engineering well two, opens negative displacement deflecting starting point, and is straight
Well borehole track；
Second segment S402 since horizontal engineering well two opens negative displacement deflecting starting point increasing hole angle to generationD2 negative displacement skew
Negative displacement deflecting terminal is opened away from rear drop angle to horizontal engineering well two, wherein, horizontal engineering well two opens the negative of negative displacement deflecting terminal
Displacement bias is away from d2 >=250-d1 is met, orientation is for two well well head lines and backwards to straight well well head, second segment S402 maximum well
Oblique angle is 6~12 °；
3rd section of S403, which from horizontal engineering well two opens negative displacement deflecting terminal and be drilled into horizontal engineering well two, opens positive build inclined point,
And it is vertical boreholes track；
4th section of S404, which from horizontal engineering well two opens positive build inclined point and be drilled into horizontal engineering well two, opens landing point, and increases to be steady
Inclined borehole track, borehole track are inStandard circular arc；
5th section of S405 opens landing point from horizontal engineering well two and is drilled into connection docking point, and horizontal hole track.
Preferably, in the a1 of second step, straight well well head is located at ground surface, and well passes through topsoil and unconsolidated formation to straight well one
Open terminal, straight well one opens terminal positioned at stablizing in clay layer 10~20m below 10~20m or bedrock surface.
Preferably, in the a2 of second step, straight well two opens 20~40m below the shale layer that terminal is located in heat reservori；Meanwhile
Any shale layer for choosing thickness >=6m in heat reservori as connection docking layer position, connection docking point be located at the shale layer top circle with
Lower 2~4m.
Preferably, in the b1 of the 3rd step, horizontal engineering well well head is located at ground surface, and well passes through topsoil and unconsolidated formation extremely
Horizontal engineering well one opens terminal, horizontal engineering well one open terminal positioned at stablize in clay layer 10 below 10~20m or bedrock surface~
20m。
Preferably, in the b2 of the 3rd step first paragraph S401, horizontal engineering well two opens negative displacement deflecting starting point and is placed in sandstone
The middle part of layer, and opened positioned at horizontal engineering well two at 1/5 Along ent of borehole track total vertical depth.
Preferably, in the b2 of the 3rd step second segment S402, the well of increasing hole angle formula borehole track is from negative displacement deflecting starting point
With 4~6 °/30m of build angle rate since 0 ° of hole deviation increasing hole angle up to producingTerminate after d2 negative displacement；Now, increasing hole angle formula well rail
The terminal hole deviation in road is θ °, and orientation is along two well well head lines and backwards to straight well well head；
The well of drop angle formula borehole track since the terminal of increasing hole angle formula borehole track with 4~6 °/30m of build angle rate drop
Tiltedly until producingTerminate after d2 negative displacement, now, the terminal hole deviation of drop angle formula borehole track is 0 °, and orientation is along two well well heads
Line and backwards straight well well head.
Preferably, in the b2 of the 3rd step the 4th section of S404, well opens positive build inclined point with deflecting from horizontal engineering well two
6~9 °/30m of rate opens land point to horizontal engineering well two by 0 ° of stable 90 ° of increasing hole angle and landed, and orientation is along two well well head lines and direction
Straight well well head；Meanwhile horizontal engineering well two open landing point position meet condition be：
If 250m≤d1+d2≤346m, 190m≤VSI-VSH≤d1+d2-60；
If d1+d2>346m, then 190m≤VSI-VSH≤286m。
Preferably, in the b2 of the 3rd step the 5th section of S405, the hole deviation of the 5th section of S405 borehole track is kept for 90 °, side
Position is along two well well head lines and towards straight well well head.
Preferably, in the b2 of the 3rd step the 3rd section of S403, horizontal engineering well two opens the bar of positive build inclined point position satisfaction
Part is：
If 250m≤d1+d2≤346m, 190m≤TVDJ-TVDH≤d1+d2-60；
If d1+d2>346m, then 190m≤TVDJ-TVDH≤286m；
Meanwhile horizontal engineering well two opens positive build inclined point positioned at stablizing in sand layers.
One kind is based on the horizontal docking style geothermal well borehole track of straight well negative displacement, the U-shaped structure of geothermal well borehole track.
Compared with prior art, the beneficial effects of the invention are as follows：
One kind provided by the invention is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement, passes through water
Flat engineering well two opens the implementation of S402 sections, generates negative displacement offset distance d2, makes d1+d2 >=250m, effectively increases underground company
Logical docking distance, it is ensured that the connection operation of two wells is smoothed out, and horizontal docking style geothermal well skill is used for city narrow and small place
Art exploitation mid-deep strata geothermal resource of hydrothermal type creates condition；The build angle rate of S402 sections is opened by the horizontal engineering well two of adjustment and walked
Negative displacement well section length, it can further increase negative displacement offset distance d2, d1+d2 is exceeded well over 250m, so as to further improve well
Lower connection docking distance, the horizontal engineering well two of increase open the length of S405 sections, increase heat exchanger channels length, improve heat transfer effect.
Further, straight well one is opened into terminal, horizontal engineering well one is opened terminal and is placed in below stable clay layer or bedrock surface,
Energy is provides effective supporting course into the sleeve pipe in well after well, so as to effectively insulate the bad grounds such as top unconsolidated formation, drift sand formation,
Two are improved to drive a well an operational security.
Further, horizontal engineering well negative displacement deflecting starting point, positive build inclined point are placed in stable sand layers, can are to bore
Well deflecting tool improves effective fulcrum, is advantageous to quickly improve hole deviation, increases deflecting effect.
Further, layer is docked using the shale layer of thickness >=6m in heat reservori as connection, and connection docking point is placed in
2~4m below the shale layer, characteristic of the shale layer sheet as water barrier can be utilized, further improves pit shaft and aqueous heat reservori
Effect is insulated, improves " taking heat not fetch water " effect.
Further, by the way of horizontal engineering well implements negative displacement, straight well borehole track is simple, and glass is opened in straight well two
It is small that glass steel section draw cave task difficulty, after cave is implemented, can effectively reduce the difficulty of two wells connection docking, improve connection into
Work(probability.
Brief description of the drawings
Fig. 1 is Hole clean schematic diagram.
Embodiment
Below in conjunction with the accompanying drawings, the present invention is described in more detail.
Really to realize " only taking heat not fetch water " exploitation 1500~3000m mid-deep strata geothermal resource of hydrothermal types, the present invention adopts
With a kind of Novel horizontal docking style geothermal well technology, straight well pit shaft and horizontal engineering well shaft to be formed " U " by being docked and connected
Type pipe, heat is taken using cold and hot water circulation.Well head distance of this Novel horizontal docking style geothermal well to straight well and horizontal engineering well
There is certain requirement (being usually less than 250m), to ensure there are enough distances that is docked and connected between two wells.But in urban area
During using the technology, due to the limitation of construction site size, this specific well head required distance is generally unattainable.To solve
This problem, the present invention provide it is a kind of implement negative displacement in horizontal engineering well, the be docked and connected borehole track of distance of increase underground is set
Meter method.
As shown in figure 1, one kind provided by the invention is based on the horizontal docking style geothermal well Hole clean of straight well negative displacement
Method, comprise the following steps：
The first step, according to construction area geological conditions, the stratum met is bored to well and is layered, determine topsoil, loose
Layer, the depth for stablizing clay layer, bedrock surface, sand layers, shale layer and heat reservori, especially determine the mud of thickness >=6m in heat reservori
Formation depth；
Second step, straight well well head A and horizontal engineering well well head B coordinate is measured, two Jing Jing are calculated according to both coordinates
Mouthful the distance between d1, while the negative displacement offset distance d2 that horizontal engineering well borehole track needs is determined according to distance d1, its
In, d2 >=250-d1；
3rd step, determine that straight well one opens borehole track S1：Straight well one opens borehole track S1 and uses vertical boreholes track, from straight
Well well head A is drilled into straight well one and opens terminal C, wherein, straight well well head A is located at ground surface, and well passes through topsoil and unconsolidated formation to end
Point C, straight well one open terminal C positioned at stablizing in clay layer 10~20m below 10~20m or bedrock surface；
4th step, determine that straight well two opens borehole track S2：Straight well two opens borehole track S2 and uses vertical boreholes track, from straight
Well one, which opens terminal C and is drilled into straight well two, opens terminal D, and straight well two opens 20~40m below the shale layer that terminal D is located in heat reservori；
Simultaneously any shale layer for choosing thickness >=6m in heat reservori is as connection docking layer position, while by the shale layer top
2~4m below boundary is arranged to the connection docking point J of straight well and horizontal engineering well；
5th step, determine that horizontal engineering well one opens borehole track S3：
Track S3 uses vertical boreholes track, and being drilled into horizontal engineering well one from horizontal engineering well well head B opens terminal E, wherein,
Horizontal engineering well well head B is located at ground surface, and well passes through topsoil and unconsolidated formation E to terminal, and terminal E, which is located at, to be stablized in clay layer
10~20m below 10~20m or bedrock surface；
6th step, determine that horizontal engineering well two opens borehole track S4：
Track S4 from horizontal engineering well one open terminal E be drilled into connection docking point J, track S4 include first paragraph S401, second
Section S402, the 3rd section of S403, the 4th section of S404 and the 5th section of S405, specifically：
First paragraph S401：Terminal E is opened from horizontal engineering well one be drilled into horizontal engineering well two open negative displacement deflecting starting point F, and
Using vertical boreholes track, wherein, well opens negative displacement deflecting starting point through stablizing clay layer or basement rock to horizontal engineering well two
F, negative displacement deflecting starting point F are placed in the middle part of sand layers, and 1/5 decile of borehole track total vertical depth is opened positioned at horizontal engineering well two
At point；
Second segment S402：Negative displacement deflecting starting point F is opened from horizontal engineering well two be drilled into horizontal engineering well two and open negative displacement make
Oblique terminal G, and use " increasing hole angle-drop angle " formula borehole track, wherein, the well of increasing hole angle formula borehole track is from negative displacement deflecting starting point
F with 4~6 °/30m of build angle rate since 0 ° of hole deviation increasing hole angle up to producingTerminate after d2 negative displacement offset distance；Now, increasing hole angle formula
The terminal hole deviation of borehole track is θ °, and orientation is along two well well head lines and backwards to straight well well head A；
The well of drop angle formula borehole track since the terminal of increasing hole angle formula borehole track with 4~6 °/30m of build angle rate drop
Tiltedly until producingTerminate after d2 negative displacement offset distance, now, the terminal hole deviation of drop angle formula borehole track is 0 °, and orientation is along two
Well well head line and backwards straight well well head A；
6~12 ° of the maximum hole angle of second segment S402 full section wells；Coordinate compass design of drilling track softwares, enter one
Successive step and optimization build angle rate and maximum hole angle, meet negative displacement deflecting terminal G negative displacement offset distance d2 >=250-d1
Under the conditions of, negative displacement deflecting terminal G is placed in stable sand layers；
3rd section of S403：Negative displacement deflecting terminal G is opened from horizontal engineering well two be drilled into horizontal engineering well two open positive build inclined
Point H, and use vertical boreholes track, wherein, positive build inclined point H position according to the 4th section of S404 Hole cleans parameter,
D1 and d2 sums and connect docking point J position and determine；Specifically：
S404 is usedStandard circular arc borehole track, according to symmetry principle, circular arc borehole track is in vertical and horizontal direction
Increment be reciprocity, therefore two open normal kickoff point (KOP) H and the vertical depth TVD that connects docking point JJ-TVDH, positive build inclined is opened with two
Point H exists with connection docking point J horizontal range d1+d2 to be associated, therefore, two conditions for opening positive build inclined point H positions satisfaction are：
If 250m≤d1+d2≤346m, 190m≤TVDJ-TVDH≤d1+d2-60；
If d1+d2>346m, then 190m≤TVDJ-TVDH≤ 286m,
Wherein, S404 using 6~9 °/30m of build angle rate from 0 ° of steady increasing hole angle to 90 °, it is necessary to horizontal displacement as 190~286m,
The reserved adjustment distance 60m of the needs that are docked and connected；
Meet that opening positive build inclined point H by two while above-mentioned condition is placed in stable sand layers；Driven a well a total vertical depth two
In the case of less, negative displacement deflecting terminal G opens positive build inclined point H with two and may overlapped, i.e. S403 may be not present；
4th section of S404：Positive build inclined point H is opened from horizontal engineering well two be drilled into horizontal engineering well two and open landing point I, use
Steady increasing hole angle borehole track, borehole track are inStandard circular arc, wherein, well is from positive build inclined point H with 6~9 °/30m of build angle rate
By 0 ° of stable increasing hole angle, orientation is landed, now, hole deviation increases to along two well well head lines and towards straight well well head A to landing point I
90°；
Landing point I position determines according to the design parameter of borehole track and fixed positive build inclined point H positions, by marking
The symmetric relation of director circle arc borehole track, the difference VS of the horizontal displacement of I points and H pointsI-VSHWith TVDJ-TVDHRelation of equal quantity be present,
Therefore landing point I position meets that condition is：
If 250m≤d1+d2≤346m, 190m≤VSI-VSH≤d1+d2-60；
If d1+d2>346m, then 190m≤VSI-VSH≤286m；
5th section of S405：Landing point I is opened from horizontal engineering well two and is drilled into connection docking point J, and uses horizontal hole track,
Wherein, the hole deviation of the borehole track is kept for 90 °, and orientation is along two well well head lines and towards straight well well head A.
One kind as obtained by the design of above-mentioned design method is based on the horizontal docking style geothermal well borehole track of straight well negative displacement
For U-shape structure.
Claims (10)
1. one kind is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement, it is characterised in that including following
Step：
The first step, according to the size of construction area, shape determine straight well well head (A) and horizontal engineering well well head (B) position and
Coordinate, according to the distance d1 of the coordinate of straight well well head (A) and horizontal engineering well well head (B) calculating between the two, further according to distance
D1 determines the negative displacement offset distance d2 of slanted well bores track；
Second step, the borehole track of straight well is determined, wherein, the borehole track of straight well opens borehole track S1 and straight well including straight well one
Two open borehole track S2：
A1, determine that straight well one opens borehole track S1：
Straight well one, which opens borehole track S1 and is drilled into straight well one from straight well well head (A), opens terminal (C), and is straight well borehole track；
A2, determine that straight well two opens borehole track S2：
Straight well two, which opens borehole track S2 and from straight well one opens terminal (C) and be drilled into straight well two, opens terminal (D), and is straight well borehole track,
Meanwhile this section is provided with the connection docking point (J) connected with horizontal engineering well；
3rd step, horizontal engineering well borehole track is determined, wherein, horizontal engineering well borehole track drives a well including horizontal engineering well one
Eye track S3 and horizontal engineering well two open borehole track S4：
B1, determine that horizontal engineering well one opens borehole track S3：
Horizontal engineering well one, which opens borehole track S3 and is drilled into horizontal engineering well one from horizontal engineering well well head (B), opens terminal (E), and is
Straight well borehole track；
B2, determine that horizontal engineering well two opens borehole track S4：
Horizontal engineering well two, which opens borehole track S4, includes first paragraph S401, second segment S402, the 4th section of S404 and the 5th section of S405,
Specifically：
First paragraph S401, which from horizontal engineering well one opens terminal (E) and is drilled into horizontal engineering well two, opens negative displacement deflecting starting point (F), and is
Straight well borehole track；
Second segment S402 increasing hole angles since horizontal engineering well two opens negative displacement deflecting starting point (F) extremely produceNegative displacement skew
Negative displacement deflecting terminal (G) is opened away from rear drop angle to horizontal engineering well two, wherein, horizontal engineering well two opens negative displacement deflecting terminal
(G) negative displacement offset distance meets d2 >=250-d1, and orientation is for two well well head lines and backwards to straight well well head (A), second segment
S402 maximum hole angle is 6~12 °；
3rd section of S403, which from horizontal engineering well two opens negative displacement deflecting terminal G and be drilled into horizontal engineering well two, opens positive build inclined point (H),
And it is vertical boreholes track；
4th section of S404, which from horizontal engineering well two opens positive build inclined point (H) and be drilled into horizontal engineering well two, opens landing point (I), and is steady
Increasing hole angle formula borehole track, borehole track are inStandard circular arc；
5th section of S405 opens landing point (I) from horizontal engineering well two and is drilled into connection docking point (J), and horizontal hole track.
2. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the a1 of second step, straight well well head (A) is located at ground surface, and well passes through topsoil and unconsolidated formation to straight well one
Open terminal (C), straight well one opens terminal (C) positioned at stablizing in clay layer 10~20m below 10~20m or bedrock surface.
3. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the a2 of second step, straight well two opens 20~40m below the shale layer that terminal (D) is located in heat reservori；Meanwhile
Any shale layer for choosing thickness >=6m in heat reservori is located at the shale layer top as connection docking layer position, connection docking point (J)
2~4m below boundary.
4. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the b1 of 3rd step, horizontal engineering well well head (B) is located at ground surface, and well passes through topsoil and unconsolidated formation extremely
Horizontal engineering well one opens terminal (E), horizontal engineering well one open terminal (E) positioned at stablize in clay layer 10~20m or bedrock surface with
Lower 10~20m.
5. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the b2 of 3rd step first paragraph S401, horizontal engineering well two opens negative displacement deflecting starting point (F) and is placed in sand layers
Middle part, and opened positioned at horizontal engineering well two at 1/5 Along ent of borehole track total vertical depth.
6. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the b2 of 3rd step second segment S402, the well of increasing hole angle formula borehole track from negative displacement deflecting starting point (F) with
4~6 °/30m of build angle rate since 0 ° of hole deviation increasing hole angle up to producingNegative displacement after terminate；Now, increasing hole angle formula borehole track
Terminal hole deviation be θ °, orientation is along two well well head lines and backwards to straight well well head (A)；
The well of drop angle formula borehole track since the terminal of increasing hole angle formula borehole track with 4~6 °/30m of build angle rate drop angle it is straight
To generationNegative displacement after terminate, now, the terminal hole deviation of drop angle formula borehole track is 0 °, and orientation is along two well well head lines
And backwards to straight well well head (A).
7. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the b2 of 3rd step the 4th section of S404, well opens positive build inclined point (H) with build angle rate from horizontal engineering well two
6~9 °/30m opens landing point (I) to horizontal engineering well two by 0 ° of stable 90 ° of increasing hole angle and landed, and orientation is along two well well head lines and court
To straight well well head (A)；Meanwhile horizontal engineering well two open landing point (I) position meet condition be：
If 250m≤d1+d2≤346m, 190m≤VSI-VSH≤d1+d2-60；
If d1+d2>346m, then 190m≤VSI-VSH≤286m。
8. one kind according to claim 1 is based on the horizontal docking style geothermal well Hole clean method of straight well negative displacement,
It is characterized in that：In the b2 of 3rd step the 5th section of S405, the hole deviation of the 5th section of S405 borehole track is kept for 90 °, orientation edge
Two well well head lines and towards straight well well head (A).
9. one kind according to claim any one of 1-8 is set based on the horizontal docking style geothermal well borehole track of straight well negative displacement
Meter method, it is characterised in that：In the b2 of 3rd step the 3rd section of S403, it is full that horizontal engineering well two opens positive build inclined point (H) position
Foot condition be：
If 250m≤d1+d2≤346m, 190m≤TVDJ-TVDH≤d1+d2-60；
If d1+d2>346m, then 190m≤TVDJ-TVDH≤286m；
Meanwhile horizontal engineering well two opens positive build inclined point (H) positioned at stablizing in sand layers.
10. one kind such as claim 1-9 design gained is based on the horizontal docking style geothermal well borehole track of straight well negative displacement, it is special
Sign is：The U-shaped structure of geothermal well borehole track.
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| CN112302535A (en) * | 2019-07-26 | 2021-02-02 | 新奥科技发展有限公司 | Well drilling device and warehouse building method of geothermal system |
| 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 |
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