CN209385108U - A kind of straight well structure - Google Patents
A kind of straight well structure Download PDFInfo
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- CN209385108U CN209385108U CN201821391200.4U CN201821391200U CN209385108U CN 209385108 U CN209385108 U CN 209385108U CN 201821391200 U CN201821391200 U CN 201821391200U CN 209385108 U CN209385108 U CN 209385108U
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- casing
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- lime
- cement
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Abstract
The utility model discloses a kind of straight well structure, it includes open-hole, casing, cement sheath, lime filler, the open-hole passes through earth's surface and extend into seat earth or more, described sleeve pipe is inserted in the open-hole and bottom is located at coal seam end hole or more, the cement sheath is rolled at the casing above roof, and the lime filler is full of the gap between described sleeve pipe and open-hole.Straight well structure provided by the utility model, it is novel in design, it is structurally reasonable, at least 3/4ths well cementation expense can be saved without whole well cementing of cement convenient for construction, and the curing time of cement is saved, but prevent the effect of borehole collapse, fixed sleeving and ground interlayer from not lacking；It is filled between casing and open-hole with lime, convenient for the chemical reaction between lime and dilute hydrochloric acid, facilitates the recycling of casing, help to improve casing utilization rate, steel consumption can be greatly reduced, production cost is reduced, reduce the cost of underground gasification furnace.
Description
Technical field
The utility model relates to underground coal gasification(UCG) production technique fields, and in particular to a kind of straight well structure.
Background technique
Coal gasification is one of the important form of coal conversion, it plays a part of taking over from the past and setting a new course for the future in all kinds of production processes.
Coal inhibition and generation work synthetic raw gas has consequence in coal chemical industry.In recent years, underground coal gasification(UCG) production technique is at home
Numerous achievements are achieved outside, which is mainly formed using heat effect, chemical reaction etc. without being manually entered underground activities face
Pyroreaction working face, by effective mixed combustible gas body mining to ground.The discharge of gas passes through straight well realization, existing routine
Gas outlet channels be that petroleum casing pipe is discharged in geotechnical boring, sleeve outer wall fixed by cementing concrete and rock, water layer, gas by
Inner wall discharge.
The straight well of the prior art is realized by geological drilling, and casing is installed in well, to fix the borehole wall and to prevent borehole collapse,
Casing have wear-resisting, acid-proof is corrosion-resistant, high temperature resistant, it is high pressure resistant the features such as.During gasification these straight wells be used as air-supply or
Person's exhaust passage.In order to make casing with ground interlayer fix, and for prevention diving flow into, gas it is excessive, the exterior space of casing
It is in the milk using cementing concrete, by bottom until well head.
To ensure above-mentioned requirements, a large amount of cementing concrete and petroleum casing pipe are usually consumed, in the state of the art,
After underground gasification furnace closed furnace, petroleum casing pipe is not further taken out, and cannot be reused.With the conventional lesser aperture φ=219.5mm
For outlet well, well cementation cost is about 300 yuan/m, and N80 rank casing cost is about 400 yuan/m, the straight well of a bite 500m depth,
Its casing and well cementation cost are about 350,000 yuan, account for about into the one third of well cost, certainly to ensure gas production requirement, are advised now
Generally all in 300mm or so, direct incurred cost at least also needs to increase more than half in the straight well aperture drawn.
The experiment work carried out shows to take out by the petroleum casing pipe of cementing concrete sealing, has very big difficulty, needs
Sizable power after taking out casing even by multiple means, casts aside technology to destroy the binding force of cement sheath and casing
Difficulty does not say that cost of implementation is much higher than casing cost, therefore existing field of gasification does not consider further that casing recovery.If can take
The casing of underground out can reduce the consumption of new pipe to a certain extent, also just accordingly reduce steel consumption while
The cost of gasification production is reduced, while obstacle is discharged for engineering activities such as later earth's surface excavations.
Utility model content
It is structurally reasonable the purpose of this utility model is to provide a kind of novel design, convenient for construction, it can reduce Cheng Jingcheng
This, is more advantageous to the straight well structure of casing recovery.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of straight well structure comprising:
Open-hole passes through earth's surface and extend into seat earth or more；
Casing is inserted in the open-hole, and bottom is located at coal seam end hole or more；
Cement sheath is rolled at the casing above roof；
Lime filler, full of the gap between described sleeve pipe and open-hole.
Preferably, the open-hole, which passes through earth's surface, extend into the above 2-5m of seat earth.
Preferably, described sleeve pipe bottom is located at the above 3-6m in coal seam end hole.
Preferably, the short sleeve that described sleeve pipe is coaxially connected by more is composed.
Preferably, the cement sheath wraps 2-3 root short sleeve above roof.
Preferably, the lime filler includes the agstone of the lime stone that partial size is 1-3mm and 200-400 mesh
End.
Straight well structure provided by the utility model, it is novel in design, it is structurally reasonable, it is solid without whole cement convenient for construction
Well, can save at least 3/4ths well cementation expense, and save the curing time of cement, but prevent borehole collapse, fixation
The effect of casing and ground interlayer does not lack；It is filled between casing and open-hole with lime, convenient for the chemistry between lime and dilute hydrochloric acid
Reaction, facilitates the recycling of casing, helps to improve casing utilization rate, can greatly reduce steel consumption, reduce production cost,
Reduce the cost of underground gasification furnace.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only to record in the utility model
Some embodiments be also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.
Fig. 1 is straight well structural schematic diagram provided by the embodiment of the utility model；
Fig. 2 is casing recovery process schematic provided by the embodiment of the utility model.
Description of symbols:
1, casing；2, open-hole；3, lime filler；4, cement sheath；5, the 4th system of earth's surface；6, rock stratum；7, water-bearing layer；8, coal
Layer；9, empty；10, slot；11, reaming bit；12, drilling rod；13, dilute hydrochloric acid；14, earth's surface lifting means.
Specific embodiment
In order to make those skilled in the art more fully understand the technical solution of the utility model, below in conjunction with attached drawing pair
The utility model is further detailed.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or the terminal device that include a series of elements not only include those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or end
The intrinsic element of end equipment.In the absence of more restrictions, being limited by sentence " including ... " or " including ... "
Element, it is not excluded that there is also other elements in process, method, article or the terminal device for including the element.This
Outside, herein, " being greater than ", " being less than ", " being more than " etc. are interpreted as not including this number；" more than ", " following ", " within " etc. understand
Being includes this number.
Underground coal gasification(UCG) production technique mainly utilizes heat effect, chemical reaction etc. to form pyroreaction working face, will
Effectively mixed combustible gas body mining then passes through straight well and realizes to ground, the discharge of gas.
As shown in Figure 1, the present embodiment devises a kind of straight well structure comprising casing 1, open-hole 2,3 and of lime filler
Cement sheath 4.
Wherein, open-hole 2 is the drilling drilled out from big surface layer to coal seam 8, which passes through earth's surface and extend into 8 bottom of coal seam
More than plate, it is preferable that as shown in Figure 1, it is 5, rock stratum 6 (mantlerock), water-bearing layer 7, rock stratum 6 that open-hole 2, which sequentially passes through earth's surface the 4th,
(lower rock stratum) to the coal seam above 2-5m of 8 bottom plate.Usual open-hole 2 is vertical holes.
Casing 1 is inserted into the open-hole 2, and bottom is located at the whole hole in coal seam 8 or more.Preferably, which is located at
The coal seam 8 end above 3-6m in hole.
Since the depth of open-hole 2 is all very deep, single casing is difficult have length so, thus, it is preferable that described sleeve pipe
1 short sleeve being coaxially connected by more is composed, and passes through the side of welding or screw thread connection between adjacent short sleeve
Formula is connected.(each casing in contrast, organizing packaged tube 1 will be shorter than casing 1, so the casing of group packaged tube 1 is known as short set
Pipe)
Cement sheath 4 is rolled at the casing 1 above 8 top plate of coal seam.When casing 1 by more coaxially connected short sleeve combine and
Cheng Shi, it is preferable that the cement sheath 4 wraps 2-3 root short sleeve above 8 top plate of coal seam.Cement sheath is the art in terms of drilling engineering
Language, cement sheath refer to the Behavior of Hardened Cement Paste that cement slurry is formed in annular space, and effect is to wrap set pipe collar to circularize, after well cementing operation
Casing and stratum are cemented together by cement sheath (i.e. Behavior of Hardened Cement Paste).
Lime filler 3 is full of the gap between described sleeve pipe 1 and open-hole 2, it is preferable that the lime filler 3 includes grain
Diameter is the lime stone of 1-3mm and the limestone powder of 200-400 mesh.
Described sleeve pipe 1 should have wear-resisting, acid-proof is corrosion-resistant, high temperature resistant, it is high pressure resistant the features such as.The main function of the casing 1
It is that stratum (earth's surface the 4th is 5, rock stratum 6 (mantlerock), water-bearing layer 7, rock stratum 6 (lower rock stratum)) corresponding with open-hole 2 forms isolation,
And using the inner space of casing 1 as gas access way.The main function of lime filler 3 be with casing 1 and stratum it
Between generate frictional force, fixed sleeving 1 and stratum, while playing buffer function in 1 process of expansion and contraction of casing.Cement sheath 4
Main function is to be formed closed, prevents gas excessive into upper area, and the end of casing 1 is fixed.
Above-mentioned straight well structure, Specific construction process are as follows:
1. to open-hole 2 carry out wellbore construction, open-hole 2 sequentially pass through earth's surface the 4th be 5, rock stratum 6 (mantlerock), water-bearing layer 7,
Rock stratum 6 (lower rock stratum) to the coal seam 8 bottom plate above 2-5m transfers casing into open-hole 2 after the construction of open-hole 2 is completed and detects qualification
1, until 1 bottom of casing is located at the coal seam 8 end above 3-6m in hole；
2. forming cement sheath 4 to high-temperature cement well cementation is carried out at the casing above 8 top plate of coal seam；
When the short sleeve that casing 1 is coaxially connected by more is composed, at the upward 2-3 root short sleeve of 8 top plate of coal seam
High-temperature cement well cementation is carried out, cement sheath 4 is formed；
3. the gap between casing 1 and open-hole 2 is filled by the limestone particle of partial size 1-3mm and the lime of 200-400 mesh
The lime filler 3 of stone powder composition, while air hose is accessed, it dries downwards, the head of this process middle sleeve 1 and periphery execution are close
It closes；
4. when close to well head 3-5m, carrying out mechanical puddling to lime filler 3, then the every filling 1m of remainder is progress
Tamping, until well head and earth's surface intersection, complete construction.
Above-mentioned straight well structure, it is novel in design, it is structurally reasonable, it can be saved at least convenient for construction without whole well cementing of cement
3/4ths well cementation expense, and the curing time of cement has been saved, but prevent the work of borehole collapse, fixed sleeving and ground interlayer
With not lacking；It is filled between casing 1 and open-hole 2 with lime, convenient for the chemical reaction between lime and dilute hydrochloric acid, facilitates casing
1 recycling helps to improve casing utilization rate, can greatly reduce steel consumption, reduce production cost, reduce underground gasification
The cost of furnace.
As shown in Fig. 2, after the service life of straight well, being returned to casing therein when appearance cavity 9 in coal seam 8
The method of receipts is as follows:
A, the dilute hydrochloric acid 13 that mass fraction is 10-15% is continuously injected on the outside of 1 wall of casing, while using drilling machine to lower part
Casing on cement sheath 4 within the scope of 2-5m is cut, and slot 10 is formed, and casing separation lifts cutting equipment；
B, when dilute hydrochloric acid 13 penetrates into 10 position of slot, using drilling rod 12 into casing 1 tripping in reaming bit 11
Position to slot 10 loosens casing every 10-15m in advance；The torque of drilling rod 12 is set as 12 energy of drilling rod first
Then the 80-90% of bearing value gradually above mentions drilling rod 12 according to pre- loosening situation and is gradually reduced the torque value of drilling rod 12；
C, it after completion casing loosens in advance, proposes drilling rod 12, stops the injection of dilute hydrochloric acid 13, it is right using earth's surface lifting means 14
Casing is stripped.
Above-mentioned casing recovery method, removal process is simple, easy to accomplish, helps to improve casing utilization rate, can subtract significantly
Few steel consumption, reduces production cost, reduces the cost of underground gasification furnace.
Above-mentioned straight well structure and casing recovery method, particular technique effect are then as described below:
1, without whole well cementing of cement, at least 3/4ths well cementation expense can be saved, and the time for having saved cement is solidifying
Time, but prevent the effect of borehole collapse, fixed sleeving and ground interlayer from not lacking；
2, casing recovery process is simple, and easily realizes, using the chemical reaction between lime stone and dilute hydrochloric acid, makes consolidating for filling
Body dissolution, the frictional force between casing and solid is lost, but the corrosion resistant casing of acid-proof will not be corroded by dilute hydrochloric acid；
3, straight well structure is corresponding with casing recovery method, reduces construction cost, has saved operating expenses, improved casing
Utilization rate.
It is above that certain exemplary embodiments of the utility model are only described by way of explanation, undoubtedly, for
Those skilled in the art can be with a variety of different without departing from the spirit and scope of the utility model
Mode is modified described embodiment.Therefore, above-mentioned attached drawing and description are regarded as illustrative in nature, and should not be construed as
Limitation to the utility model claims protection scope.
Claims (3)
1. a kind of straight well structure characterized by comprising
Open-hole passes through earth's surface and extend into seat earth or more；
Casing is inserted in the open-hole, and bottom is located at coal seam end hole or more；
Cement sheath is rolled at the casing above roof；
Lime filler, full of the gap between described sleeve pipe and open-hole；
The short sleeve that described sleeve pipe is coaxially connected by more is composed, and it is short that the cement sheath wraps 2-3 root above roof
Casing；
The lime filler includes the limestone powder of the lime stone that partial size is 1-3mm and 200-400 mesh.
2. straight well structure according to claim 1, which is characterized in that the open-hole pass through earth's surface extend into seat earth with
Upper 2-5m.
3. straight well structure according to claim 1, which is characterized in that described sleeve pipe bottom is located at the above 3- in coal seam end hole
6m。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821391200.4U CN209385108U (en) | 2018-08-27 | 2018-08-27 | A kind of straight well structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821391200.4U CN209385108U (en) | 2018-08-27 | 2018-08-27 | A kind of straight well structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209385108U true CN209385108U (en) | 2019-09-13 |
Family
ID=67869236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821391200.4U Expired - Fee Related CN209385108U (en) | 2018-08-27 | 2018-08-27 | A kind of straight well structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209385108U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894766A (en) * | 2018-08-27 | 2018-11-27 | 北京博锐新能科技有限公司 | A kind of straight well structure and casing recovery method |
-
2018
- 2018-08-27 CN CN201821391200.4U patent/CN209385108U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108894766A (en) * | 2018-08-27 | 2018-11-27 | 北京博锐新能科技有限公司 | A kind of straight well structure and casing recovery method |
| CN108894766B (en) * | 2018-08-27 | 2023-12-05 | 北京博锐新能科技有限公司 | Vertical well structure and casing recovery method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190913 Termination date: 20210827 |