CN102465693A - Underground coal gasification bored well body structure and construction method thereof - Google Patents
Underground coal gasification bored well body structure and construction method thereof Download PDFInfo
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- CN102465693A CN102465693A CN2010105320686A CN201010532068A CN102465693A CN 102465693 A CN102465693 A CN 102465693A CN 2010105320686 A CN2010105320686 A CN 2010105320686A CN 201010532068 A CN201010532068 A CN 201010532068A CN 102465693 A CN102465693 A CN 102465693A
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Abstract
The invention discloses a construction method for an underground coal gasification bored well body structure. The method is characterized by comprising the following steps of: boring a well hole at least extended from the ground to a coal bed; lowering a combustible sleeve with the predetermined length into the well hole; when the combustible sleeve is lowered to a predetermined position in the well hole, continuously lowering the combustible sleeve by means of another sleeve connected with the upper end of the combustible sleeve, so that the lower end of the combustible sleeve is positioned at a predetermined position in the coal bed; and fixing the combustible sleeve and the another sleeve in the well hole. The invention also provides the corresponding well body structure.
Description
Technical field
The present invention relates to the building method of underground coal gasification(UCG) boring well body structure and underground coal gasification(UCG) boring well body structure.
Background technology
The gasification furnace drilling well of underground coal gasification(UCG) process comprises the air inlet well and goes out two types of process wells of gas well, and the selection and the stable operation that whether rationally directly affect gasifying process of its technological borehole design are that underground coal gasification(UCG) realizes steady production and crucial cheaply.In underground coal gasification(UCG) is produced, be that gasifying agent is delivered to coal seam to be gasified through the air inlet well into and out of the main effect of gas well, coal is combustion gasification output coal gas and lime-ash in position, and coal gas will be derived ground, lime-ash and then stay underground through being gone out gas well.
In traditional oil, natural gas field; The design of boring well body structure is the basic engineering of drilling engineering; Can boring well body material chosen and transfer the important component part that the position is casing programme design, the reasonability of basic engineering directly influence the oil gas well safety, high-quality, high speed and economic bored and reached target zone and the protection reservoir is realized steady production, prevented to damage.
Underground coal gasification(UCG) is built the stove drilling well with reference to oil drilling, and its well construction adopts petroleum series steel sleeve pipe to be transferred to the bottom, coal seam by the ground drifting usually, and then cement the well successively sealing, open-work Cheng Jing.This structure design can be because of coal seam special geological structural condition in the underground coal gasification(UCG) process, and occur such as following problem: gasifying agent infeeds not in place, strengthens and connects difficulty, makes the local coal seam can not gasification, and combustion; The wellhole of giving vent to anger bottom ash slag gathers, and stops up venthole or surface duct; At the bottom of the turnover gas well, form local fluid-tight, cause the SR fluctuation big.Therefore, rational well construction will help to improve the coal recovery ratio, the stability of giving vent to anger, and reduce SR and sharply change.
Summary of the invention
The object of the invention is exactly design of inlet, outlet boring well body structure and the corresponding building method that a kind of optimization will be provided, and it can be realized the location supply of gasifying agent and reduce the turnover gas well and stop up and water seal.
According to an aspect of the present invention, a kind of building method of underground coal gasification(UCG) boring well body structure is provided, has it is characterized in that this method comprises: get out the wellhole that extends to the coal seam from ground at least; In wellhole, transfer flammable sleeve pipe with predetermined length; When this flammable sleeve pipe is lowered to the precalculated position in this wellhole; Continue to transfer said flammable sleeve pipe by the other sleeve pipe that is connected with the upper end of said flammable sleeve pipe, thereby make the lower end of said flammable sleeve pipe be arranged in the pre-position in coal seam; And with said flammable sleeve pipe and said other sleeve pipe fix in position in wellhole.
According to another aspect of the present invention; A kind of underground gasification boring well body structure is provided; This boring well body structure comprises: the working column that extends to the wellhole in coal seam at least and be arranged in wellhole from ground is characterized in that said working column comprises the flammable sleeve pipe of upper sleeve and bottom; Wherein, the lower end of said flammable sleeve pipe is arranged in the pre-position in coal seam.
Have following beneficial effect according to boring well body structure of the present invention and building method thereof:
(1) the not flammable hard sleeve combination cost cost of flammable sleeve pipe and for example oil steel sleeve pipe is low.
(2) flammable sleeve pipe is transferred to the gasification coal seam, can realize the location supply of gasifying agent, helps connecting.
(3) flammable sleeve pipe be prone to be ablated, and not slagging scorification, does not lump, and the lime-ash that effectively reduces in producing is piled up, and reduces lime-ash and stops up and water seal, improves gasifier operation stability, prolongs the boring application life of giving vent to anger, and reduces production costs indirectly.
(4) the flammable sleeve pipe not flammable hard sleeve light weight of oil steel sleeve pipe is transferred more easily.
Describe below in conjunction with the accompanying drawing specific embodiments of the invention.
Description of drawings
Schematically show embodiment of the present invention in the accompanying drawing, wherein: Fig. 1 to Fig. 4 shows the sketch map according to the building method of drilled well bore structure of the present invention, particularly, Fig. 4 show completion according to drilled well bore structure of the present invention.
Description of reference numerals: 1-ground, the 2-wellhole, the 3-upper sleeve, the 4-cementing concrete, the 5-roof, the 6-pressure bearing and seal connects, the flammable sleeve pipe of 7-, 8-coal seam, 9-seat earth.
The specific embodiment
At first with reference to Fig. 4, it shows according to drilled well bore structure of the present invention.As shown in Figure 4, drilled well bore structure according to the present invention comprises: extend to the wellhole 2 in the coal seam 8 between roof 5 and the seat earth 9, the working column that comprises the flammable sleeve pipe 7 of upper sleeve 3 and bottom, cementing concrete 4 etc. at least from ground 1.Working column is positioned in the wellhole 2, and the lower end of flammable sleeve pipe 7 is arranged in the pre-position in coal seam.In one embodiment, said flammable sleeve pipe 7 can be designed to its length and equals the thickness in coal seam basically and be lowered its lower end roughly to flush with seat earth 9.In another embodiment, said flammable sleeve pipe 7 can be designed to the thickness 1/2 that its length equals the coal seam basically, and is lowered its lower end and closes on seat earth 9.Working column for example can be by cementing concrete 4 fix in position.
A key character of the present invention is, the part that is positioned at the foot of said working column is flammable sleeve pipe 7 and non-traditional steel sleeve pipe.According to the present invention; Flammable sleeve pipe 7 should have low, the incendive characteristics of fusing point; Thereby when the gasifying agent path is provided, can also be in the high temperature burning down of coal seam gasification burning, and can not produce a large amount of lime-ash and perhaps cause blocking the sleeve pipe of wellhole or top and then influence the coal gas extraction.
According to preferred implementation of the present invention, working column is a multi-segment structure, and promptly the flammable sleeve pipe 7 of foot adopts connecting portion 6 to be connected with upper sleeve 3.Said connecting portion 6 is preferably the pressure bearing and seal connecting portion.Owing to may produce high pressure at the initial stage that connects of the stream such as fluids such as gasifying agent or coal gas; So said pressure bearing and seal connecting portion is preferably designed so that feasible: connect the initial stage at fluid (for example gasifying agent or coal gas) stream, this connecting portion place can not leak, gas leak phenomenon.Said connecting portion 6 for example can be realized by the connection of the internal and external threads of end separately through two adjacent sleeve pipes.
What need special instruction is; According to the present invention; It also can be multistage that the foregoing upper sleeve 3 that links to each other with the flammable sleeve pipe 7 of foot can be one section; And both can be the for example oil steel sleeve pipe of the standard of porcelain bushing or field of petroleum exploitation of not flammable hard sleeve, also can be flammable the sleeve pipe 7 the same or similar flammable sleeve pipes with foot, can also be the combination in any of not flammable hard sleeve and flammable sleeve pipe.
According to one embodiment of present invention, the flammable sleeve pipe 7 in said bottom can be continuous integral structure with upper sleeve 3.
In addition, flammable sleeve pipe 7 also should have predetermined strength and pressure-bearing property, makes that the said precalculated position in transferring to said coal seam before can be not impaired.
According to the present invention, said flammable sleeve pipe 7 can be for example glass reinforced plastic pipe, PE pipe, pvc pipe etc.
According to the present invention, said wellhole can be the air inlet well.At this moment, correspondingly, said precalculated position is for waiting the position, coal seam of gasifying, and said working column is delivered to coal seam to be gasified with gasifying agent.In addition, said wellhole also can be the well of giving vent to anger.At this moment, correspondingly, said precalculated position is the coal seam gasification position, and the coal gas that coal seam gasification obtains is directed at ground through this working column.
A kind of building method of aforesaid drilled well bore structure also is provided according to a further aspect in the invention.This method comprises following several steps substantially: (1) gets out the wellhole that extends to the coal seam at least; (2) transfer the working column that comprises the flammable sleeve pipe in bottom, make the flammable sleeve pipe in said bottom transfer the precalculated position to the coal seam; And (3) steady job sleeve pipe.
Below in conjunction with aforesaid working column is that the situation of multi-segment structure specifies this.
To shown in Figure 4, is the situation of multi-segment structure for working column like Fig. 1, and this method can comprise the steps:
Step 1: accomplish and extend to the naked hole coal seam, that adhere to specification wellhole 2 in other words at least, as shown in Figure 1;
Step 2: transfer the flammable sleeve pipe 7 that meets design length (for example coal seam thickness) from the aperture of wellhole; And when transferring to the precalculated position (for example when position, aperture, the upper end of flammable sleeve pipe 7) near wellhole; Adopt pressure bearing and seal connecting portion 6 on flammable sleeve pipe 7, to connect second sleeve pipe 3; As shown in Figure 2, continue to transfer said flammable sleeve pipe 7 by this second sleeve pipe 3 then;
Those skilled in the art will be understood that for this step, also can carry out as follows, that is: at first adopt the pressure bearing and seal connecting portion on flammable sleeve pipe 7, to connect second sleeve pipe 3, from the aperture of wellhole both combinations are transferred then;
Step 3: when transferring to the precalculated position; In the time of for example near the aperture of the upper end of this second sleeve pipe 3 arrival wellhole; The upper end of adopting pressure bearing and seal to be connected this second sleeve pipe 3 connects and transfers the 3rd sleeve pipe, and pressure bearing and seal connects and transfers n root sleeve pipe so repeatedly, and n is the integer more than or equal to 3; Be lowered till the precalculated position until the lower end of said flammable sleeve pipe 7, as shown in Figure 3;
What those skilled in the art will be understood that is, above-mentioned the 3rd so that n root sleeve pipe maybe and nonessential.In other words, under special circumstances, might just be enough to flammable sleeve pipe is transferred to predetermined position by single sleeve pipe.
Step 4: accomplish the boring construction in later period, final casing programme is accomplished in well cementation, open-work completion, well logging, the hydrostatic test etc., and is as shown in Figure 4.
For ease of further understanding the present invention, method especially of the present invention, the several instantiations of explanation below.
Below be to be 500 meters to hole depth, the position, coal seam of gasifying in advance is 484～495 meters, and clean coal is thick to be 8 meters and for example implementation step of the present invention to be described:
Accomplish naked hole depth and be 500 meters boring and coring construction;
According to getting the core result, confirm that oil steel casing shoe transfers 486 meters of positions, 492.5 meters of positions are transferred in the glass reinforced plastic pipe bottom;
6.5 meters long glass reinforced plastic pipes are connected with oil steel sleeve pipe, adopt thread connecting mode, glass reinforced plastic pipe is transferred to underground 486 meters;
Transfer about 0.5 meter (the installation surface pipeline network) in oil steel sleeve pipe to ground;
The construction in later period of holing, well cementation, open-work completion, well logging, the hydrostatic test etc.
Below be to be 480 meters to hole depth, the position, coal seam of gasifying in advance is 470～478 meters, and clean coal is thick to be 6 meters and for example implementation step of the present invention to be described:
Accomplish naked hole depth and be 480 meters boring and coring construction;
According to getting the core result, confirm that oil steel casing shoe transfers 468 meters of positions, 475.5 meters of positions are transferred in PE pipe bottom;
7.5 meters long PE pipe is connected with oil steel sleeve pipe, adopts thread connecting mode, the PE pipe is transferred to underground 475.5 meters;
Transfer about 0.5 meter (the installation surface pipeline network) in oil steel sleeve pipe to ground;
The construction in later period of holing, well cementation, open-work completion, well logging, the hydrostatic test etc.
Below be to be 580 meters to hole depth, the position, coal seam of gasifying in advance is 570～578 meters, and clean coal is thick to be 6 meters and for example implementation step of the present invention to be described:
Accomplish naked hole depth and be 580 meters boring and coring construction;
According to getting the core result, confirm that oil steel casing shoe transfers 568 meters of positions, 575.5 meters of positions are transferred in the pvc pipe bottom;
7.5 meters long pvc pipes are connected with oil steel sleeve pipe, adopt thread connecting mode, pvc pipe is transferred to underground 575.5 meters;
Transfer about 0.5 meter (the installation surface pipeline network) in oil steel sleeve pipe to ground;
The construction in later period of holing, well cementation, open-work completion, well logging, the hydrostatic test etc.
Have following beneficial effect according to boring well body structure of the present invention and method thereof:
(1) the not flammable hard sleeve combination cost cost of flammable sleeve pipe and for example oil steel sleeve pipe is low.
(2) flammable sleeve pipe is transferred to the gasification coal seam, can realize the location supply of gasifying agent, helps connecting.
(3) flammable sleeve pipe be prone to be ablated, and not slagging scorification, does not lump, and the lime-ash that effectively reduces in producing is piled up, and reduces lime-ash and stops up and water seal, improves gasifier operation stability, prolongs the boring application life of giving vent to anger, and reduces production costs indirectly.
(4) the flammable sleeve pipe not flammable hard sleeve light weight of oil steel sleeve pipe is transferred more easily.
Claims (11)
1. the building method of a underground coal gasification(UCG) boring well body structure is characterized in that, this method comprises:
Get out the wellhole that extends to the coal seam from ground at least;
In wellhole, transfer flammable sleeve pipe with predetermined length,
When this flammable sleeve pipe is lowered to the precalculated position in this wellhole, continues to transfer said flammable sleeve pipe by the other sleeve pipe that is connected with the upper end of said flammable sleeve pipe, thereby make the lower end of said flammable sleeve pipe be arranged in the pre-position in coal seam; And
With said flammable sleeve pipe and said other sleeve pipe fix in position in wellhole.
2. method according to claim 1; It is characterized in that; The said step of transferring comprises: at first transfer said flammable sleeve pipe from the aperture of wellhole; When the upper end of flammable sleeve pipe during, adopt the pressure bearing and seal ways of connecting to connect second sleeve pipe, and continue to transfer said flammable sleeve pipe then by this second sleeve pipe in the upper end of flammable sleeve pipe near the position, aperture of wellhole; Perhaps, at first adopt the pressure bearing and seal ways of connecting on flammable sleeve pipe, to connect second sleeve pipe, from the aperture of wellhole both combinations are transferred then.
3. method according to claim 2; It is characterized in that; The said step of transferring further comprises: when putting near the aperture that the upper end of walking to second sleeve pipe arrives wellhole instantly, the upper end of adopting pressure bearing and seal to be connected this second sleeve pipe connects and transfers the 3rd sleeve pipe, and pressure bearing and seal connects and transfers n root sleeve pipe so repeatedly; N is the integer more than or equal to 3, is lowered till the precalculated position until the lower end of said flammable sleeve pipe.
4. method according to claim 1; It is characterized in that; The said pressure bearing and seal that is connected to connects; And said pressure bearing and seal connects and is designed to make: connect the initial stage at fluid flowing path, this connection can not leaked, gas leak phenomenon, and said connection can be connected by the internal and external threads of the end of flammable sleeve pipe and said other sleeve pipe and realizes.
5. method according to claim 1; It is characterized in that; Said flammable cannula configuration becomes and can under the temperature of coal seam gasification burning, burn, and has predetermined strength and pressure-bearing property, makes that the said precalculated position in transferring to said wellhole before can be not impaired.
6. method according to claim 1; It is characterized in that; Said flammable sleeve pipe is glass reinforced plastic pipe, PE pipe or pvc pipe, and said other sleeve pipe is flammable sleeve pipe or not flammable hard sleeve, and said not flammable hard sleeve comprises porcelain bushing and standard oil steel sleeve pipe.
7. underground gasification boring well body structure; This boring well body structure comprises: the working column that extends to the wellhole in coal seam at least and be arranged in wellhole from ground; It is characterized in that; Said working column comprises the flammable sleeve pipe of upper sleeve and bottom, and wherein, the lower end of said flammable sleeve pipe is arranged in the pre-position in coal seam.
8. structure according to claim 7; It is characterized in that; Said upper sleeve is connected through the pressure bearing and seal connecting portion with said flammable sleeve pipe; And said pressure bearing and seal connecting portion is designed to make: at the perforation initial stage of fluid flowing path, this connecting portion place can not leak, gas leak phenomenon, and the internal and external threads of the end that said connecting portion can be through flammable sleeve pipe and upper sleeve connects and realizes.
9. structure according to claim 7; It is characterized in that; Said flammable cannula configuration becomes and can under the temperature of coal seam gasification burning, burn, and has predetermined strength and pressure-bearing property, makes that the said precalculated position in transferring to said wellhole before can be not impaired.
10. structure according to claim 7; It is characterized in that; Said flammable sleeve pipe is glass reinforced plastic pipe, PE pipe or pvc pipe, and said upper sleeve is flammable sleeve pipe or not flammable hard sleeve, and said not flammable hard sleeve comprises porcelain bushing and standard oil steel sleeve pipe.
11. structure according to claim 7; It is characterized in that; Said wellhole is the air inlet well or goes out gas well, and said precalculated position is for waiting gasify position, coal seam or coal seam gasification position, and said working column is delivered to the coal seam or coal gas is exported to ground of waiting to gasify with gasifying agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105320686A CN102465693A (en) | 2010-10-29 | 2010-10-29 | Underground coal gasification bored well body structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010105320686A CN102465693A (en) | 2010-10-29 | 2010-10-29 | Underground coal gasification bored well body structure and construction method thereof |
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| CN102465693A true CN102465693A (en) | 2012-05-23 |
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| CN2010105320686A Pending CN102465693A (en) | 2010-10-29 | 2010-10-29 | Underground coal gasification bored well body structure and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088588A (en) * | 2014-06-24 | 2014-10-08 | 新奥气化采煤有限公司 | Sleeve for coal underground gasification, and intake and exhaust hole structure for coal underground gasification |
| CN104563874A (en) * | 2014-12-24 | 2015-04-29 | 新奥气化采煤有限公司 | Underground gasification well cementing method and well structure |
| CN107558983A (en) * | 2017-10-23 | 2018-01-09 | 河南理工大学 | Underground coal gasification(UCG) coaxial pipes device and its gasification process |
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| DE3524865A1 (en) * | 1985-07-12 | 1987-01-15 | Rheinische Braunkohlenw Ag | Coupling sleeve for pipes |
| FR2619887A1 (en) * | 1987-08-31 | 1989-03-03 | Dev Geothermie En | Pipe made of composite material of the glass fibres/resin type |
| CN1171149A (en) * | 1994-10-24 | 1998-01-21 | 阿迈隆国际公司 | High pressure fiber reinforced composite pipe joint |
| CN101749005A (en) * | 2010-03-17 | 2010-06-23 | 新奥气化采煤有限公司 | Protection process of underground drilling hole |
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2010
- 2010-10-29 CN CN2010105320686A patent/CN102465693A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3524865A1 (en) * | 1985-07-12 | 1987-01-15 | Rheinische Braunkohlenw Ag | Coupling sleeve for pipes |
| FR2619887A1 (en) * | 1987-08-31 | 1989-03-03 | Dev Geothermie En | Pipe made of composite material of the glass fibres/resin type |
| CN1171149A (en) * | 1994-10-24 | 1998-01-21 | 阿迈隆国际公司 | High pressure fiber reinforced composite pipe joint |
| CN101749005A (en) * | 2010-03-17 | 2010-06-23 | 新奥气化采煤有限公司 | Protection process of underground drilling hole |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104088588A (en) * | 2014-06-24 | 2014-10-08 | 新奥气化采煤有限公司 | Sleeve for coal underground gasification, and intake and exhaust hole structure for coal underground gasification |
| CN104563874A (en) * | 2014-12-24 | 2015-04-29 | 新奥气化采煤有限公司 | Underground gasification well cementing method and well structure |
| CN107558983A (en) * | 2017-10-23 | 2018-01-09 | 河南理工大学 | Underground coal gasification(UCG) coaxial pipes device and its gasification process |
| CN107558983B (en) * | 2017-10-23 | 2023-10-13 | 河南理工大学 | Underground coal gasification coaxial pipeline device and gasification method thereof |
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Application publication date: 20120523 |