CN206874231U - Hole structure - Google Patents
Hole structure Download PDFInfo
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- CN206874231U CN206874231U CN201720703576.3U CN201720703576U CN206874231U CN 206874231 U CN206874231 U CN 206874231U CN 201720703576 U CN201720703576 U CN 201720703576U CN 206874231 U CN206874231 U CN 206874231U
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- compensation device
- hole structure
- stress
- loop buffer
- stress compensation
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Abstract
The utility model provides a kind of hole structure.The hole structure includes：Drill body, loop buffer band and stress compensation device；Wherein, drilling body is provided with loop buffer band in predeterminated position；The diameter of loop buffer band is more than the diameter of drilling body；The stress compensation device for being coaxial therewith setting is provided with loop buffer band；First sleeve and the second sleeve pipe are arranged with respectively above and below stress compensation device in drilling body.Hole structure provided by the utility model not only reduces the intensity of shear stress by the loop buffer band of setting, and by the stress compensation device of setting when stress exceedes compensator permissible value, stress compensation device compensates tensile failure of the excessive crustal stress to first sleeve and the second sleeve pipe, i.e. stress compensation device offsets stretching, shear loads caused by formation displacement, drilling can be made to adapt to the change of rock stratum, hole structure stability is improved, the damage of underground gasification process drilling is avoided and then influences the gasification of coal.
Description
Technical field
Coal and Coal-seam Gas Recovery Technologies field are the utility model is related to, in particular to a kind of hole structure.
Background technology
Coal underground gasification technology is the technology for utilizing the situ combustion of coal, gasification reaction to produce coal gas or synthesis gas,
In Underground Coal Gasification Process, for the progress of maintenance reaction, it usually needs set in coal seam into gas drilling hole, go out gas drilling hole
With the gasification tunnel of corresponding connection inlet, outlet drilling.General air inlet drill for conveyed into coal seam gasifying agent (such as air,
Oxygen etc.), and burning, gasification reaction generation coal gas of high temperature, high-temperature coal occur in gasification tunnel with coal seam for the gasifying agent being sent into
Gas is then expelled to ground for later use by going out gas drilling hole.Above and below the ground, the stabilization of drilling is underground gas for drilling contact
It is melted into one of key lost.
In Underground Coal Gasification Process, coal combustion provides energy needed for gasification reaction, consume coal because of reaction and
Burned out area is formd in coal seam.As reaction is carried out, burned out area size constantly expands, and changes the original stress of coal seam country rock
State.Under high temperature and the crustal stress effect of coal combustion, the overlying strata on burned out area can be caving, be broken etc. rock stratum
Displacement movement, so as to form caving zone and fracture belt (being collectively referred to as water flowing fractured zone) in overlying strata.Be in be caving, the brill in fracture belt
Hole, the crustal stress caused by being migrated by rock stratum a variety of effects such as are stretched, distorted, being sheared and damage or fracture occurs.It is special
It is not at the larger rock stratum interface of intensity difference (such as water-bearing layer, mud stone), due to the mutation of rock strength, to be more easy to
The migration of rock stratum occurs, often and the region the most serious that wrecks that drills, domestic and international field test show, about 3%~
28% drilling is destroyed at 2~9 meters of roof due to the movement (stretching action) in vertical direction.About 72%
~97% drilling is destroyed in the place apart from 20~40 meters of burned out area due to the movement (shear action) in horizontal direction.
Thus, in Underground Coal Gasification Process, for the drilling being near burned out area, higher requirement is proposed to its stability.
Prior art hole structure is single, general to use individual layer petroleum casing pipe or carbon steel pipe, and sleeve pipe uses with stratum annular space
High temperature resistant cement is cemented the well entirely, and in actual use, sleeve pipe has a common boundary because of insufficient strength or dropout in water-bearing layer and water barrier
At face, sleeve pipe damage is the most serious.Patent CN201410289232 provides a kind of improved method, in sleeve pipe damageable zone, adopts
Carry out sleeve pipe connection up and down with funnel-shaped structure, but such a structure can not ensure reliably to seal or be difficult to resist drag,
Shear stress.Patent CN201410820229 provides another improved method, and the stratum in the range of water flowing fractured zone is whole
Petroleum casing pipe is substituted using metal bellows, such a structure requires high to material and manufacturing process, and drilling cost can be carried significantly
It is high.
Utility model content
In consideration of it, the utility model proposes a kind of hole structure, it is intended to solves the existing flimsy problem of drilling.
On one side, the utility model proposes a kind of hole structure.The drilling includes：Drill body, loop buffer band
With stress compensation device；Wherein, the drilling body is provided with the loop buffer band in predeterminated position, for reducing shear stress
Intensity；The diameter of the loop buffer band is more than the diameter of the drilling body；Be provided with the loop buffer band and its
The stress compensation device being coaxially disposed, for offsetting stretching and shear loads caused by formation displacement；The drilling is originally
First sleeve and the second sleeve pipe are arranged with respectively above and below the stress compensation device in vivo, for cementing the well.
Further, above-mentioned hole structure, the stress compensation device include：Interior compensating part and external compensation part；Wherein, it is described
The internal diameter of external compensation part is more than the external diameter of the interior compensating part, also, the external compensation part is sheathed on outside the interior compensating part；Institute
State and first annular passage is provided between first sleeve and the drilling body, also, second sleeve pipe and the drilling body
Between be provided with the second circular passage；Annular space is provided between the outer wall of the inwall of the external compensation part and the interior compensating part,
For connecting the first annular passage and second circular passage.
Further, above-mentioned hole structure, the bottom of the first annular passage are provided with the first swell packers；It is described
The top of second circular passage is provided with the second swell packers.
Further, above-mentioned hole structure, it is circular that first is provided with first swell packers along its length
Through hole, for connecting the first annular passage and the annular space；And/or the second swell packers interior edge its length
Degree direction is provided with the second manhole, for connecting second circular passage and the annular space.
Further, above-mentioned hole structure, the outer wall of the stress compensation device are provided with hydro-expansive rubber.
Further, above-mentioned hole structure, filled out between the stress compensation device and the loop buffer band provided with filler,
For supporting and protecting the loop buffer band.
Further, above-mentioned hole structure, the stress compensation device are connected with the first sleeve by ball pivot.It is described
Stress compensation device is connected with second sleeve pipe by the ball pivot.
Hole structure provided by the utility model not only reduces the intensity of shear stress by the loop buffer band of setting, and
And by the stress compensation device of setting when stress exceedes compensator permissible value, stress compensation device can be stretched certain length
Degree, so as to compensate tensile failure of the excessive crustal stress to first sleeve and the second sleeve pipe, i.e. stress compensation offsets formation displacement institute
Caused stretching, shear loads, drilling can be made to adapt to the change of rock stratum, improve borehole stability, avoid underground gasification
The damage of process drilling and then the gasification of influence coal.
Brief description of the drawings
By reading the detailed description of hereafter preferred embodiment, it is various other the advantages of and benefit it is common for this area
Technical staff will be clear understanding.Accompanying drawing is only used for showing the purpose of preferred embodiment, and is not considered as to this practicality
New limitation.And in whole accompanying drawing, identical part is denoted by the same reference numerals.In the accompanying drawings：
Fig. 1 is the structural representation for the hole structure that the utility model embodiment provides；
Fig. 2 is the another structural representation for the hole structure that the utility model embodiment provides.
Embodiment
The exemplary embodiment of the disclosure is more fully described below with reference to accompanying drawings.Although the disclosure is shown in accompanying drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
Limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
Completely it is communicated to those skilled in the art.It should be noted that in the case where not conflicting, the implementation in the utility model
Feature in example and embodiment can be mutually combined.It is below with reference to the accompanying drawings and in conjunction with the embodiments new to describe this practicality in detail
Type.
Hole structure embodiment：
Referring to Fig. 1 and Fig. 2, the hole structure can include：Drill body 1, loop buffer band 2 and stress compensation device 3.Tool
Body, it will be apparent to a skilled person that drilling body 1 is the open-hole for being drilled into coal seam downwards by ground.
Wherein, drilling body 1 can be provided with loop buffer band 2 in predeterminated position, for reducing the intensity of shear stress.
The diameter of loop buffer band 2 can be more than the diameter of drilling body 1.Specifically, predeterminated position can set caving zone, fracture belt
Developing has the position of maximum transversal displacement in stratum, such as develops stratum in caving zone, fracture belt.Those skilled in the art
It is generally known that in the range of the development of caving zone, fracture belt at the interface of different rock-layers, lateral shear motion in rock stratum is strong, tool
There is maximum transversal displacement, therefore predeterminated position can be arranged on caving zone, the rock stratum interface such as first on fracture belt development stratum
The interface of the rock stratum 13 of rock stratum 12 and second, the height of loop buffer band 2 can be 5~40m and along (phase above and below the interface of rock stratum
For the position shown in Fig. 1) it is symmetrical arranged.The diameter in the setting increase hole of loop buffer band 2, to reduce shear stress
Intensity.Wherein it is preferred to for the intensity of further mild method, the diameter of loop buffer band 2 can be first sleeve 4
2~4 times of diameter.
Stress compensation device 3 can be provided with loop buffer band 2, is carried for offsetting to stretch and shear caused by formation displacement
Lotus acts on.Specifically, further to offset caused by formation displacement, stretching and shear loads, stress compensation device 3 can be with
Loop buffer band 2 is coaxially disposed.
The sleeve pipe of first sleeve 4 and second can be arranged with respectively above and below stress compensation device 3 in drilling body 1
5, for cementing the well.Specifically, it is known in those skilled in the art to be, in order to prevent coal bed drilling during coal gas extraction it is short
Collapse hole blocks in time, to improve the coal gas drainage efficient that drills, it will usually to transferring sleeve pipe in coal bed drilling drilling rod.Wherein,
The sleeve pipe 5 of sleeve 4 and second can be welded more by going here and there bunch tube, and the diameter of the sleeve pipe 5 of first sleeve 4 and second can phase
Together.Stress compensation device 3 can be it is multiple, between the middle sleeve string of the second sleeve pipe 5 can in roof above apart from its preset away from
From place, stress compensation device 3 is set.Known in those skilled in the art to be, roof 14 is located at caving zone, part coal seam hair
When life is caving, caving zone overlying strata can produce downward pulling force to connected sleeve pipe, have maximum axial displacement, pre-determined distance
It can be mining height.
Answered as can be seen that the hole structure provided in the present embodiment not only reduces shearing by the loop buffer band 2 of setting
The intensity of power, and by the stress compensation device 3 of setting when stress exceedes stress compensation 3 permissible value of device, stress compensation device 3 can
With certain length that is stretched, so as to compensate tensile failure of the excessive crustal stress to the sleeve pipe 5 of first sleeve 4 and second, i.e. stress
Compensator 3 offsets stretching, shear loads caused by formation displacement, and drilling can be made to adapt to the change of rock stratum, improves and bores
Hole stability, avoid the damage of underground gasification process drilling and then influence the gasification of coal.
In the above-described embodiments, stress compensation device 3 can include：The interior (not shown) of compensating part 31 and external compensation part 32
(not shown).
Wherein, the internal diameter of external compensation part 32 can be more than the external diameter of interior compensating part 31, also, external compensation part (32) can cover
Located at interior compensating part (31) outside.First annular passage 6, also, second set can be provided between first sleeve 4 and drilling body 1
The second circular passage 7 can be provided between pipe 5 and drilling body 1.External compensation part 32 can be coaxially disposed with interior compensating part 31, outside
Annular space can be provided between the outer wall of the inwall of compensating part 32 and interior compensating part 31, for connecting the first annular He of passage 6
Second circular passage 7.Known in those skilled in the art to be, the diameter of the sleeve pipe 5 of first sleeve 4 and second, which is respectively less than, drills this
The diameter of body 1, the sleeve pipe 5 of first sleeve 4 and second can be coaxially disposed with drilling body 1, so that first sleeve 4 and drilling body
It is provided between 1 between the first annular sleeve pipe 5 of passage 6 and second and drilling body 1 and is provided with the second circular passage 7.To strengthen boring
The intensity of pore structure, it can fill out provided with cement mortar in the first annular circular passage 7 of passage 6 and second.
The stress compensation device 3 provided in the present embodiment, pass through the annular space between interior compensator 31 and External compensator 32
The first annular circular passage 7 of passage 6 and second is connected, the flowing of cement mortar during to cement the well, has promoted cement mortar to flow equal
Even property, to increase the stability of the hole structure and intensity, while ensure loop buffer band 2 not by cement mortar sealing.
In the above-described embodiments, the bottom of first annular passage 6 is provided with the first swell packers 8.Second circular passage 7
Top be provided with the second swell packers 9.Specifically, it is uniformly packing sleeve pipe and coal seam, the first swell packers 8 can be in
Complete cycle of the bottom of first annular passage 6 along first annular passage 6 is set, and the second swell packers 9 can be logical in the second annular
Complete cycle of the bottom in road 7 along first annular passage 6 is set.First swell packers 8 and the second swell packers 9 are in water-swellable
Set afterwards along the complete cycle of circular passage, to insulate coal seam and sleeve pipe.
As can be seen that in the present embodiment, glue is met by the setting of the first swell packers 8 and the second swell packers 9
Coal seam and sleeve pipe can be not only insulated after cylinder volumetric expansion, meanwhile, the first annular circular passage 7 of passage 6 and second can be insulated
With loop buffer band 2, it can prevent the cement mortar after the first annular circular passage 7 of passage 6 and second well cementation from entering loop buffer
Band 2.
In the above-described embodiments, (above-below direction as shown in Figure 1) can be with along its length in the first swell packers 8
The first manhole is provided with, for connecting first annular passage 6 and annular space；And/or the expansion packing of utility model second
(above-below direction as shown in Figure 1) can be provided with the second manhole along its length in device 9, for connecting the second annular
Passage 7 and annular space.Specifically, the axial direction of the first manhole and the second manhole can be with the axial direction for the body 1 that drills
It is arranged in parallel, also, the first manhole and the second manhole can be multiple, to be further easy to the stream of cement mortar
It is dynamic.
As can be seen that first annular passage 6, the are connected by the first manhole and the second manhole in the present embodiment
Second ring passage 7 and annular space, the flowing of cement mortar during to cement the well.
In the various embodiments described above, the outer wall of stress compensation device 3 is provided with hydro-expansive rubber.Specifically, rainwater expands
Rubber can be set along the outer wall complete cycle of stress compensation device 3.As can be seen that in the present embodiment, pass through setting for hydro-expansive rubber
Stratum water can be absorbed by putting, and volume can fill supporting after gradually expanding to loop buffer band 2, to prevent loop buffer band 2 weeks
Enclose collapsing, contract, becoming silted up for coal seam.
In the various embodiments described above, it can fill out provided with filler 10, be used between stress compensation device 3 and loop buffer band 2
Support and protect annular buffer strip 2.Wherein, filler 10 can be silica gel, polyurethane, bentonite, rubber, pitch and other height
Molecular material etc., as filling support material.
As can be seen that annular can further be prevented by filling supporting loop buffer band 2 by filler 10 in the present embodiment
Collapse, contract, becoming silted up in the surrounding coal seam of buffer strip 2.When stratum is migrated in caving zone, fracture belt, particularly strong shearing fortune
When dynamic, filler 10 can offset the displacement caused by the transverse movement of rock stratum or weaken the intensity of displacement, to protect first set
The sleeve pipe 5 of pipe 4 or second is not by bad break.
In the various embodiments described above, stress compensation device 3 is connected with first sleeve 4 by ball pivot 11.Stress compensation device 3 with
Second sleeve pipe 5 is connected by ball pivot 11.For ease of the torsion of ball pivot 11, it is preferable that the deflection angle of ball pivot can be 15 °~
20°.Wherein, can also be that other connected modes such as bearing connects between stress compensation device 3 and the sleeve pipe 5 of first sleeve 4 and second
Connect, be rotatably connected, certain ball pivot 11 can be the other structures parts such as universal joint, and any restriction is not done to it in the present embodiment.
As can be seen that when rock stratum lateral displacement occurs, ball pivot 11 can deflect, while coordinate with stress compensation device 2,
The sleeve pipe 5 of first sleeve 4 and second is set to follow the movement of rock stratum and stretch, offset, reverse, and outside maximum shear area, mainly
Generation stretched vertically moves, and is filled and fixes by cement mortar due to the second circular passage 7, overall with the motion on stratum can transport
Dynamic, so that the second sleeve pipe 5 adapts to the change of rock stratum, protection sleeve pipe string is not pulled off, bad break, is twisted into two parts.
In summary, the hole structure provided in the present embodiment not only reduces shearing by the loop buffer band 2 of setting should
The intensity of power, and by the stress compensation device 3 of setting when stress exceedes stress compensation 3 permissible value of device, stress compensation device 3 can
With certain length that is stretched, so as to compensate tensile failure of the excessive crustal stress to the sleeve pipe 5 of first sleeve 4 and second, i.e. stress
Compensator 3 offsets stretching, shear loads caused by formation displacement, and drilling can be made to adapt to the change of rock stratum, improves and bores
Hole stability, avoid the damage of underground gasification process drilling and then influence the gasification of coal.
Obviously, those skilled in the art can carry out various changes and modification without departing from this practicality to the utility model
New spirit and scope.So, if these modifications and variations of the present utility model belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these changes and modification.
Claims (7)
- A kind of 1. hole structure, for underground coal gasification(UCG), it is characterised in that including：Drill body (1), loop buffer band (2) With stress compensation device (3)；Wherein,The drilling body (1) is provided with the loop buffer band (2) in predeterminated position, for reducing the intensity of shear stress；The diameter of the loop buffer band (2) is more than the diameter of the drilling body (1)；The stress compensation device (3) for being coaxial therewith setting is provided with the loop buffer band (2), for offsetting formation displacement Caused stretching and shear loads；It is arranged with first sleeve (4) and the in drilling body (1) respectively above and below the stress compensation device (3) Two sleeve pipes (5), for cementing the well.
- 2. hole structure according to claim 1, it is characterised in that the stress compensation device (3) includes：Interior compensating part And external compensation part (32) (31)；Wherein,The internal diameter of the external compensation part (32) is more than the external diameter of the interior compensating part (31), also, the external compensation part (32) covers Located at the interior compensating part (31) outside；First annular passage (6), also, second sleeve pipe are provided between the first sleeve (4) and the drilling body (1) (5) the second circular passage (7) are provided between the drilling body (1)；Annular space is provided between the inwall of the external compensation part (32) and the outer wall of the interior compensating part (31), for connecting State first annular passage (6) and second circular passage (7).
- 3. hole structure according to claim 2, it is characterised in thatThe bottom of the first annular passage (6) is provided with the first swell packers (8)；The top of second circular passage (7) is provided with the second swell packers (9).
- 4. hole structure according to claim 3, it is characterised in thatThe first manhole is provided with along its length in first swell packers (8), for connecting first ring Shape passage (6) and the annular space；And/orThe second manhole is provided with along its length in second swell packers (9), for connecting second ring Shape passage (7) and the annular space.
- 5. hole structure according to claim 1, it is characterised in that the outer wall of the stress compensation device (3) is provided with chance Water-expansible rubber.
- 6. according to the hole structure described in any one of claim 1 to 5, it is characterised in thatFilled out between the stress compensation device (3) and the loop buffer band (2) provided with filler (10), for supporting and protecting institute State loop buffer band (2).
- 7. according to the hole structure described in any one of claim 1 to 5, it is characterised in thatThe stress compensation device (3) is connected with the first sleeve (4) by ball pivot (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720703576.3U CN206874231U (en) | 2017-06-15 | 2017-06-15 | Hole structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720703576.3U CN206874231U (en) | 2017-06-15 | 2017-06-15 | Hole structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206874231U true CN206874231U (en) | 2018-01-12 |
Family
ID=61333318
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720703576.3U Active CN206874231U (en) | 2017-06-15 | 2017-06-15 | Hole structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206874231U (en) |
-
2017
- 2017-06-15 CN CN201720703576.3U patent/CN206874231U/en active Active
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