CN104763336A - Well structure and underground gasifier - Google Patents
Well structure and underground gasifier Download PDFInfo
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- CN104763336A CN104763336A CN201510064580.5A CN201510064580A CN104763336A CN 104763336 A CN104763336 A CN 104763336A CN 201510064580 A CN201510064580 A CN 201510064580A CN 104763336 A CN104763336 A CN 104763336A
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Abstract
The invention discloses a well structure and an underground gasifier. The well structure comprises a straight well section and an oblique well section; the top end of the straight well section is provided with a well head, and depth of the bottom end thereof is a first depth value of an underground water content level and below where the gasifier locates; the top end of the oblique well section is connected to the bottom end of the straight well section, and the bottom end of the oblique well section extends and connects a gasifying cannel of the underground gasifier, wherein the aperture of the straight well section is more than the aperture of the top end of the oblique well section; the differential value of two apertures is a first preset value. The structure can effectively prevent water of the water content level from leaking to the gasifying channel through a well wall; the aperture of the straight well section is more than that of the oblique well section, thus the thickness and quality of a well cementing cement ring of the water content level can be increased; and thereby, the well structure and the underground gasifier can further prevent the furnace well from leakage in working process, and the working efficiency of the underground gasifier is improved.
Description
Technical field
The present invention relates to Coal Gasification field, particularly a kind of well construction and underground gasification furnace.
Background technology
Underground coal gasification(UCG) carries out in the coal seam in gasification tunnel, and its core technology impels gasifying agent (air or oxygen, steam etc.) fully to contact with subterranean coal, by the pyrolysis of coal and chemical action, produces fuel gas.
In the process of gasification, especially after main force's coal seam gasification, original coal seam is converted into coal ash, the supporting role of prime stratum is significantly reduced, even there will be caving in of roof, the sleeve pipe and the cement that enter coal seam under causing rupture along with caving in of roof, misplace and come off, and finally cause the blocking into and out of pore of underground coal gasification(UCG), have a strong impact on the normal operation of underground coal gasification(UCG).At present in underground coal gasification(UCG) proving ground, all there is the phenomenon that leakage, well are stifled in the most wells of burned out area.
Prior art solves the problem, and is all to adopt the problems such as the mode of workover treatment solves leakage, well blocks up.And workover treatment can only solve surperficial leakage, well blocks up problem, can not solve root problem, because a lot of well is after well workover completes, uses and just not there will be above-mentioned problem again for a long time.Thus there will be a bite well and repeatedly repair and repeatedly still have problem, and still there is the toxic gases such as a large amount of high temperature, high pressure in gasification passage after gasification, in well workover process, there is very large potential safety hazard.
Summary of the invention
Easily there is leakage in the course of the work to solve current existing well construction, affecting the technical problem that underground gasification furnace normally runs, the invention provides a kind of well construction and be provided with the underground gasification furnace of this well construction.
The invention provides a kind of well construction, comprising:
Straight well section, described straight well section top is provided with well head, the degree of depth of bottom be at the bottom of underground reservoir below the first depth value;
Lower curved section, the top of described lower curved section connects the bottom of described straight well section, and the bottom of described lower curved section extends and is communicated with gasification tunnel; Wherein,
The difference in the aperture of described straight well section and the aperture, top of described lower curved section is greater than the first predetermined value.
Further, described lower curved section comprises inclination section and steady tilted section;
The top of described inclination section connects the bottom of described straight well section, and the bottom of described inclination section is positioned at the roof strata top on the upside of subterranean coal;
The top of described steady tilted section connects the bottom of described inclination section, and the bottom degree of depth of described steady tilted section is the second depth value of below described seat earth.
Further, sleeve pipe is provided with in described straight well section and lower curved section;
Described sleeve pipe comprises Steel Casing and flammable sleeve pipe; Wherein,
The bottom of described steel sleeve pipe is placed down in described roof strata, and is the second predetermined value apart from the distance of described roof;
The top of described flammable sleeve pipe connects the bottom of described Steel Casing, and the bottom of described flammable sleeve pipe is placed down in the described coal seam at described gasification tunnel top, and is the 3rd predetermined value apart from the distance at described gasification tunnel top.
Further, described 3rd predetermined value is arbitrary value in 1 meter-3 meters; And/or,
Described second predetermined value is arbitrary value in 3 meters-10 meters.
Further, described first predetermined value is 1 meter; And/or,
Described second depth value is arbitrary value in 2 meters-5 meters; And/or,
Described first depth value is arbitrary value in 10 meters-30 meters.
Further, described Steel Casing is steel sleeve; And/or,
Described flammable sleeve pipe is glass reinforced plastic sleeve.
Further, the radian of described inclination section is arranged on predetermined arc scope;
The final inclination angle of described inclination section is between 30 °-60 °;
The hole angle of described steady tilted section is identical with the angle of inclination of described inclination section bottom.
Further, the first cementing concrete ring is provided with between described Steel Casing and described straight well section inwall;
The second cementing concrete ring is provided with between the inwall of described Steel Casing and described lower curved section;
The 3rd cementing concrete ring is provided with between described flammable sleeve pipe and the inwall of described lower curved section.
Further, the external diameter of described first cement sheath and the difference of described second cement sheath top external diameter are greater than described first predetermined value.
The present invention also provides a kind of underground gasification furnace; Described underground gasification furnace is provided with the well construction described in above-mentioned any one.
Compared with prior art, beneficial effect of the present invention is:
A kind of well construction provided by the invention, comprising: straight well section and lower curved section, and the top of straight well section is provided with well head, the bottom degree of depth be at the bottom of the underground reservoir of underground gasification furnace place below the first depth value; The top of lower curved section connects the bottom of straight well section, and the bottom of lower curved section extends and is communicated with the gasification tunnel of described underground gasification furnace; Wherein, the aperture of straight well section is greater than the aperture, top of inclined shaft, and two aperture differences are the first predetermined value.This structure can effectively avoid the water in aquifer to leak in gasification tunnel by the borehole wall, and the aperture of straight well section is greater than lower curved section aperture, thickness and the quality of aquifer cementing concrete ring can be increased like this, thus prevent from further occurring leakage in the stove well course of work, improve the operating efficiency of underground gasification furnace.
Accompanying drawing explanation
The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the embodiment of the present invention.
Description of reference numerals:
1, upper strata, earth's surface; 11, aquifer; 12, subsurface layer; 13, roof strata; 14, coal seam; 15, floor strata; 2, straight length; 21, the first cementing concrete ring; 22, well head; 3, inclined tube section; 31, inclination section; 32, steady tilted section; 33, the second cementing concrete ring; 34, the 3rd cementing concrete ring; 4, Steel Casing; 41, flammable sleeve pipe; 5, gasification tunnel.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.Horizontal plane mentioned by the present embodiment is the plane perpendicular to gravity direction.Below in conjunction with accompanying drawing, each preferred embodiment of the present invention is described further:
The invention provides a kind of well construction, comprising: straight well section 2, straight well section 2 top is provided with well head 22, and the degree of depth of bottom is first depth value at underground reservoir 11 end below; Lower curved section 3, the top of lower curved section 3 connects the bottom of straight well section 2, and the bottom of lower curved section 3 extends and is communicated with gasification tunnel 5; Wherein, the difference in the aperture of straight well section 2 and the aperture, top of lower curved section 3 is greater than the first predetermined value.
First depth value is generally 10 meters-30 meters, and the degree of depth of straight well section 2 is chosen between 10 meters-30 meters, bottom, aquifer, can make full use of the well cementation effect of straight well section like this, avoids the water in aquifer to leak in gasification tunnel by the borehole wall, occurs leakage phenomenon; And the aperture of straight well section is greater than the aperture on lower curved section top, thickness and the quality of aquifer cementing concrete ring can be increased like this; Avoid the water in aquifer to leak in gasification tunnel by the borehole wall further, cause circulation problems.
In addition, the embodiment of the present invention also by arranging sleeve pipe in straight well section 2 and lower curved section 3, and sleeve pipe comprises Steel Casing 4 and flammable sleeve pipe 41; Steel Casing 4 does not enter coal seam 14 down, and just flammable sleeve pipe enters coal seam 14 41 times, after effectively avoiding causing casing failure, dislocation due to roof inbreak and top board formation creep, occurs that well blocks up problem.
Be specially, as shown in Figure 1, this well construction, comprise: straight well section 2 and lower curved section 3, straight well section 2 top is arranged on top, upper strata, earth's surface 1, and forms well head, and the degree of depth of straight well section 2 is 10 meters-30 meters of underground reservoir 11 end, underground gasification furnace place below, the straight well section of setting like this, reason is that the well cementation effect of straight well section 2 will obviously be better than lower curved section 3; After lower curved section enters sleeve pipe 3 times, the bottom that sleeve pipe can be close to well makes the well cementation space of bottom obviously reduce, and straight well section 2 sleeve pipe is in the centre of well all the time; Thus avoid the water in aquifer to leak in gasification tunnel by the borehole wall, there is leakage phenomenon.
Wherein, underground reservoir 11 end is subsurface layer 12, the degree of depth of straight well section 2 is for going deep into arbitrary value in subsurface layer 12 to 10 meters-30 meters, certainly the degree of depth of straight well section 2 can be selected for going deep into subsurface layer 10 meters or 15 meters or 20 meters or 25 meters or 30 meters, the degree of depth of concrete straight well section 2 can set according to actual field situation, specific embodiment with reference to foregoing description, can not repeat them here.
As shown in Figure 1, in straight well section 2 and lower curved section 3, be provided with sleeve pipe, between sleeve pipe and straight well section 2, be provided with the first cementing concrete ring 21 of cementing the well; In order to avoid occurring leakage phenomenon further, in the embodiment of the present invention, the aperture of preferred straight well section 2 is greater than the aperture on lower curved section 3 top, and two aperture differences are greater than 0.1 meter, and the sleeve pipe radius of straight well section 2 is substantially the same with the sleeve pipe radius at lower curved section 3 top, such thickness and quality that can increase the first cementing concrete ring 21 between straight well section 1 and aquifer, more effective by aquifer packing; Prevent leakage phenomenon.
The top of lower curved section 3 is connected on the bottom of straight well section 2, and the bottom of lower curved section 3 extends and is communicated with the gasification tunnel 5 of underground gasification furnace; Wherein, lower curved section 3 comprises inclination section 31 and steady tilted section 32; The top of inclination section 31 is connected on the bottom of straight well section 2, and the bottom of inclination section 31 is positioned at roof strata 13 top on the upside of underground gasification furnace place subterranean coal 14; And the top of steady tilted section 32 connects the bottom of inclination section 21, the arbitrary value in the floor strata 15 bottom coal seam 14 in 2 meters-5 meters is goed deep in the bottom of steady tilted section 32.
Lower curved section 3 is divided into inclination section 31 and steady tilted section 32, for reducing the destruction to the roof strata 13 on the upside of coal seam 14, and the bottom of inclination section 31 is deep into the top of roof strata 13, do not go deep in roof strata 13, the top of inclination section 31 connects the bottom of straight well section 2; Whole inclination section 31 is wanted steadily, avoid occurring larger radian as far as possible, to prevent from occurring card pipe phenomenon when setting of casing, the final inclination angle of preferred inclination section 31 inclination angle of pre-segment section (namely bottom inclination section) is between 30 °-60 °, the too little optimum efficiency not having lower curved section 3 structure of angle, the too large phenomenon that may occur that the radius of curvature of whole inclination section is too little and do not go under sleeve pipe of angle.
The hole angle of steady tilted section 32 and the angle of slope of inclination section 31 bottom are consistent, steady tilted section 32 is deep into arbitrary value in below seat earth 2 meters-5 meters, such design can effectively by through to gasification tunnel 5 and lower curved section 3, and the chip after drilling well being completed is deposited in the boring pocket of below coal seam 14 base plate 2 meters of-5 meters of degree of depth, drilling well chip is avoided to stay impact burning in gasification tunnel 5.
Wherein, during floor strata can be goed deep into bottom coal seam 14 in the bottom of steady tilted section 32 2 meters or 3 meters or 4 meters or 5 meters; The final inclination angle of inclination section 31 can be 30 ° or 40 ° or 45 ° or 50 ° or 60 °, and concrete angle can determine according to the actual inclination section length in scene; Steady tilted section 32 is deep into below seat earth 2 meters or 3 meters or 4 meters or 5 meters; Concrete numerical value can be determined according to Specific construction situation, and embodiment can refer to foregoing description, does not repeat them here.
The sleeve pipe be arranged on as shown in Figure 1 in straight well section 2 and lower curved section 3 comprises Steel Casing 4 and flammable sleeve pipe 41; The bottom of steel sleeve pipe 4 is placed down in roof strata 13, and is arbitrary value in 3 meters-10 meters apart from the distance of coal seam 14 top board; The top of flammable sleeve pipe 41 connects the bottom of Steel Casing 4, and the bottom of flammable sleeve pipe 41 is placed down in the coal seam 14 at gasification tunnel 5 top, and apart from the distance at gasification tunnel 5 top for being arbitrary value in 1 meter-3 meters.
The main purpose arranging two kinds of sleeve pipes is to solve coal seam in gasification and can affect the problem of well construction after gasification; Steel Casing 4 is preferably petroleum casing pipe, is a kind of incombustible sleeve pipe; And flammable sleeve pipe 41 is preferably glass reinforced plastic sleeve, it is combustible sleeve pipe under a kind of high temperature.
Steel Casing 4 depth of setting is in the roof strata 13 at top, coal seam 14, and the top board in distance coal seam 14 is arbitrary value in 3 meters-10 meters.Than use straight well, there is larger contact area because this stove well construction has in the roof strata 13 at top, coal seam, and the roof strata 13 do not destroyed on vertical direction, also directly under enter coal seam 14, the effect of layout in avoiding owing to have gasified rear roof strata 13 inbreak and the Steel Casing 4 that causes ruptures or misplaces in coal seam 14 like this.By the supporting role of Steel Casing 4, the roof strata 13 above Steel Casing 4 is made to become more stable, also can the amount of effective controlroof inbreak, prevent well and block up phenomenon.
The lower end of Steel Casing 4 is connected with the flammable sleeve pipe 41 entering coal seam directly, and flammable sleeve pipe 41 can burn in the process of underground gasification, which solves coal seam 14 in gasification and can affect the problem of well construction after gasification.Flammable sleeve pipe 41 depth of setting arbitrary value in 1-3 rice above the following gasification tunnel of coal seam 14 top board 5, as shown in Figure 1, enter in gasification tunnel 5 under not direct, thus flammable sleeve pipe 41 can be prevented to be lowered into the interior gas flowing affected in gasification tunnel 5 of gasification tunnel 5, can also smoothly gas after the gasification in gasification tunnel 5 be communicated with ground installation.
As shown in Figure 1, the second cementing concrete ring 33 is provided with between the inwall of Steel Casing 4 and lower curved section 3; The 3rd cementing concrete ring 34 is provided with between flammable sleeve pipe 41 and the inwall of lower curved section 3.Due on the first cementing concrete ring 21 inwall that Steel Casing 4 is set directly at straight well section 2 and on the second cementing concrete ring 33 inwall of lower curved section 3, so the first cementing concrete ring 21 is substantially equal with the internal diameter of the second cementing concrete ring 33, and the external diameter difference of the first cementing concrete ring 21 and the second cementing concrete ring 33 is greater than 0.1 meter.
Because the well cementation degree of depth is too dark, cement can be doped in gasification coal seam 14, gasify in the coal seam 14 affected in gasification tunnel 5, therefore the 3rd cementing concrete ring 34 is arranged between flammable sleeve pipe 41 and the inwall of lower curved section 3, and the degree of depth of the 3rd cementing concrete ring 34 is substantially equal with the degree of depth of flammable sleeve pipe 41.
The embodiment of the present invention also provides a kind of underground gasification furnace, and described underground gasification furnace is provided with above-mentioned well construction.
Because above-mentioned well construction has above-mentioned beneficial effect, so the underground gasification furnace being provided with this well construction also has same beneficial effect, specific embodiment with reference to the explanation of above-mentioned well construction, can not repeat them here.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a well construction, is characterized in that, comprising:
Straight well section (2), described straight well section (2) top is provided with well head (22), and the degree of depth of bottom is first depth value at underground reservoir (11) end below;
Lower curved section (3), the top of described lower curved section (3) connects the bottom of described straight well section (2), and the bottom of described lower curved section (3) extends and is communicated with gasification tunnel (5); Wherein,
The difference in the aperture of described straight well section (2) and the aperture, top of described lower curved section (3) is greater than the first predetermined value.
2. well construction according to claim 1, is characterized in that, described lower curved section (3) comprises inclination section (31) and steady tilted section (32);
The top of described inclination section (31) connects the bottom of described straight well section (2), and the bottom of described inclination section (31) is positioned at roof strata (13) top of subterranean coal (14) upside;
The top of described steady tilted section (32) connects the bottom of described inclination section (21), and the bottom degree of depth of described steady tilted section (32) is the second depth value of below described coal seam (14) base plate.
3. well construction according to claim 3, is characterized in that, is provided with sleeve pipe in described straight well section (2) and lower curved section (3);
Described sleeve pipe comprises Steel Casing (4) and flammable sleeve pipe (41); Wherein,
The bottom of described steel sleeve pipe (4) is placed down in described roof strata (13), and is the second predetermined value apart from the distance of described coal seam (14) top board;
The top of described flammable sleeve pipe (41) connects the bottom of described Steel Casing (4), the bottom of described flammable sleeve pipe (41) is placed down in the described coal seam (14) at described gasification tunnel (5) top, and is the 3rd predetermined value apart from the distance at described gasification tunnel (5) top.
4. well construction according to claim 3, is characterized in that, described 3rd predetermined value is arbitrary value in 1 meter-3 meters; And/or,
Described second predetermined value is arbitrary value in 3 meters-10 meters.
5. well construction according to claim 2, is characterized in that, described first predetermined value is 1 meter; And/or,
Described second depth value is arbitrary value in 2 meters-5 meters; And/or,
Described first depth value is arbitrary value in 10 meters-30 meters.
6. well construction according to claim 3, is characterized in that, described Steel Casing (4) is steel sleeve; And/or,
Described flammable sleeve pipe (41) is glass reinforced plastic sleeve.
7. the well construction according to any one of claim 2-6, is characterized in that, the radian of described inclination section (31) is arranged on predetermined arc scope;
The end predetermined portions inclination angle of described inclination section (31) is between 30 °-60 °;
The hole angle of described steady tilted section (32) is equal with described inclination section (31) end predetermined portions inclination angle.
8. well construction according to claim 3, is characterized in that, is provided with the first cementing concrete ring (21) between described Steel Casing (4) and described straight well section (2) inwall;
The second cementing concrete ring (33) is provided with between the inwall of described Steel Casing (4) and described lower curved section (3);
The 3rd cementing concrete ring (34) is provided with between the inwall of described flammable sleeve pipe (41) and described lower curved section (3).
9. well construction according to claim 8, is characterized in that, the external diameter of described first cement sheath (21) and the difference of described second cement sheath (33) top external diameter are greater than described first predetermined value.
10. a underground gasification furnace, is characterized in that, described underground gasification furnace is provided with the well construction as described in any one of claim 1-9.
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