Background technology
Along with the development of coal underground gasification technology, organic matter gasification unit is more and more wider in the application in coal underground gasification technology field, minimum entity organic matter gasification unit is by air inlet, venthole and gasification tunnel composition, wherein air inlet is transported to gasifying agent in organic matter, and be oxidized with the organic matter of high temperature, the reactions such as reduction and pyrolysis, the coal gas producing is derived ground by venthole after gasification tunnel, further utilize again, and along with gasifying agent and organic reacting, the cavity that air inlet nose end forms can be increasing, the temperature of venthole can be more and more higher, in the time holing in bottom inbreak or when temperature rise, sleeve pipe occurs flexible, can destroy the fixed structure in aquifer, top, and the water that makes aquifer, top and gasification coal seam conducting, affect normally carrying out of Underground Coal Gasification Process.
In prior art by adopting cementing concrete by borehole casing outer wall and shut between rock stratum around, and the borehole casing structure of prior art is single, do not occur straggly on stratum, or borehole casing is because variations in temperature is little, do not cause in the flexible situation of sleeve pipe, can not make the water in aquifer, top import in gasification coal seam, and then affect normally carrying out of Underground Coal Gasification Process.
But there are following two aspect problems in the sleeve pipe of prior art:
First, when upper and lower sleeve pipe junction adopts ordinary construction, because setting of casing and stratum are fixing, before boring is used, may not there is rock stratum around not and the complete asphyxia by external pressure on the chest and abdomen of setting of casing, in the time that boring is used, especially when high pressure fracture, be easy to leak gas to setting of casing stratum around from the connecting portion of upper and lower section of sleeve pipe, can increase like this wastage of gasifying agent in perforation process.
Second, when boring is when going out gas drilling hole, the gas of giving vent to anger can carry the gentle state of tiny lime-ash secretly and one of aqueous water is discharged boring, along with the growth of the time of giving vent to anger, these tiny lime-ash will with the boss place of water mixed deposit to connecting portion, the high temperature action of the gas of being given vent to anger, it is very hard that these deposits will become, thereby stop the upwards expansion of hypomere sleeve pipe, affect the operation of sleeve pipe.
Summary of the invention
Embodiments of the invention provide a kind of underground coal gasification(UCG) sleeve pipe and underground coal gasification(UCG) inlet, outlet pore structure, can avoid the invalid leakage in stratum of gasifying agent, are conducive to again the operation of sleeve pipe.For achieving the above object, embodiments of the invention adopt following technical scheme:
A kind of underground coal gasification(UCG) sleeve pipe, comprise sleeve pipe and setting of casing, described cased upper end cooperation is arranged in the lower end of described upper sleeve pipe, and described setting of casing can be free to slide along described upper internal surface of sleeve pipe, the lower end of described cased upper end and described upper sleeve pipe is funnel-shaped structure, and the lower end funnel-shaped structure of described upper sleeve pipe can carry out described cased upper end funnel-shaped structure spacing, thereby stop the lower end of described cased upper end and described upper sleeve pipe to depart from.
Further, the angle of inclination of the lower end sidewall of described upper sleeve pipe is consistent with the angle of inclination of described cased upper end sidewall.
Further, the angle of inclination of the angle of inclination of the lower end sidewall of described upper sleeve pipe and described cased upper end sidewall is 3 °～5 °.
Further, the angle of inclination of the angle of inclination of the lower end sidewall of described upper sleeve pipe and described cased upper end sidewall is 4 °.
The present invention embodiment on the other hand also provides a kind of underground coal gasification(UCG) inlet, outlet pore structure, comprise the installing hole that is opened in ground and is communicated with coal seam to be gasified, described installing hole comprises the upper sleeve pipe installing hole and the setting of casing installing hole that communicate with each other, described upper sleeve pipe installing hole arranges through the aquifer on top, coal seam to be gasified, also comprise the underground coal gasification(UCG) sleeve pipe described in as above arbitrary technical scheme, described upper sleeve pipe is fixedly installed in described upper sleeve pipe installing hole, and described setting of casing is freely arranged in described setting of casing installing hole.
Further, described upper sleeve pipe is connected with described upper sleeve pipe installing hole by cementing concrete ring.
Further, the soffit of described upper sleeve pipe is positioned at below nearest aquifer, distance coal seam to be gasified.
Further, the soffit of described upper sleeve pipe and the distance in described aquifer are greater than 5 meters.
Further, the distance of the soffit of described upper sleeve pipe and coal seam to be gasified end face is greater than and treats 5 times of gasification of coal layer thickness.
Further, the soffit of described upper sleeve pipe and the distance in described aquifer are 10 meters, described in treat that gasification of coal layer thickness is 6 meters, the distance of the soffit of described upper sleeve pipe and coal seam to be gasified end face is 40 meters.
The underground coal gasification(UCG) that the embodiment of the present invention provides is entered with sleeve pipe and underground coal gasification(UCG), air outlet hole structure, because setting of casing can be free to slide along upper internal surface of sleeve pipe, the lower end of cased upper end and upper sleeve pipe is funnel-shaped structure, the lower end funnel-shaped structure of upper sleeve pipe can carry out spacing to cased upper end funnel-shaped structure, thereby stop the lower end of cased upper end and upper sleeve pipe to depart from, due to setting of casing and its, around the rock stratum in earth formation is fixing again, may exist rock stratum around not have and the complete asphyxia by external pressure on the chest and abdomen of setting of casing, in the time that sleeve pipe is used for venthole, especially when high pressure fracture, be easy to from upper, cased connecting portion leaks gas in setting of casing rock stratum around, can increase like this wastage of gasifying agent in perforation process, and after cased upper end all adopts funnel-shaped structure to be connected with the lower end of upper sleeve pipe, on, cased connecting portion contact area will be very large, can avoid gasifying agent from upper, the rock stratum leakage towards periphery of cased junction, therefore, in the time that turnover gas drilling hole is used for high pressure fracture, the sleeve pipe that this funnel-shaped structure of employing preferably connects.Again due in the time that sleeve pipe is used for venthole, the gas of giving vent to anger can carry the gentle state of tiny lime-ash secretly and one of aqueous water is discharged venthole, along with the growth of the time of giving vent to anger, these tiny lime-ash will be with water mixed deposit to upper, cased connecting portion, the given vent to anger high temperature action of gas, it is very hard that these deposits will become, thereby stop setting of casing upwards to expand, the impact that makes setting of casing produce external force to upper sleeve pipe increases, and then the possibility that the air hole structure in aquifer, Casing Failure top and the water in aquifer, top are imported in stove increases, be difficult to ensure normally carrying out of Underground Coal Gasification Process, and after the lower end of cased upper end and upper sleeve pipe adopts funnel-shaped structure to be connected, on, setting of casing connecting portion transitions smooth, can form hardly and affect the deposit that setting of casing upwards expands, therefore, on, setting of casing is conducive to the operation of sleeve pipe after adopting funnel-shaped structure to connect, especially more favourable to the operation of sleeve pipe in the time that sleeve pipe is used for venthole.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiment of the present invention underground coal gasification(UCG) is described in detail by sleeve pipe and underground coal gasification(UCG) inlet, outlet pore structure.
In description of the invention, it will be appreciated that, orientation or the position relationship of the instructions such as term " " center ", " on ", D score, 'fornt', 'back', " left side ", " right side ", " vertically ", " level ", " top ", " end ", " interior ", " outward " be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of the device of instruction or hint indication or element must have specific orientation, with specific orientation structure with operate, therefore can not be interpreted as limitation of the present invention.
Term " first ", " second " be only for describing object, and can not be interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characterictic.Thus, one or more these features can be expressed or impliedly be comprised to the feature that is limited with " first ", " second ".In description of the invention, except as otherwise noted, the implication of " multiple " is two or more.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be to be directly connected, also can indirectly be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
Fig. 1 is a specific embodiment of embodiment of the present invention underground coal gasification(UCG) sleeve pipe, underground coal gasification(UCG) sleeve pipe in the present embodiment, comprise sleeve pipe 1 and setting of casing 2, the upper end cooperation of described setting of casing 2 is arranged in the lower end of described upper sleeve pipe 1, and described setting of casing 2 can be free to slide along described upper sleeve pipe 1 inwall, the lower end of the upper end of described setting of casing 2 and described upper sleeve pipe 1 is funnel-shaped structure, and the lower end funnel-shaped structure of described upper sleeve pipe 1 can carry out spacing to the upper end funnel-shaped structure of described setting of casing 2, thereby stop the upper end of described setting of casing 2 and the lower end of described upper sleeve pipe 1 to depart from.
The underground coal gasification(UCG) sleeve pipe that the embodiment of the present invention provides, the lower end of the upper end of setting of casing 2 and upper sleeve pipe 1 is funnel-shaped structure, the lower end funnel-shaped structure of upper sleeve pipe 1 can carry out the upper end funnel-shaped structure of setting of casing 2 spacing, thereby stops the upper end of setting of casing 2 and the lower end of upper sleeve pipe 1 to depart from.Because setting of casing 2 is fixing with the rock stratum in earth formation around it, may exist rock stratum around not have and the complete asphyxia by external pressure on the chest and abdomen of setting of casing 2, in the time that sleeve pipe is used for venthole, especially when high pressure fracture, be easy to from upper, cased connecting portion leaks gas in setting of casing 2 rock stratum around, can increase like this wastage of gasifying agent in perforation process, if being funnel-shaped structure with the lower end of upper sleeve pipe 1, the upper end of setting of casing 2 is connected, go up so, cased connecting portion contact area will be very large, can avoid gasifying agent from upper, the rock stratum leakage towards periphery of cased junction, therefore, in the time that turnover gas drilling hole is used for high pressure fracture, the sleeve pipe that this funnel-shaped structure of employing preferably connects.
In above-described embodiment, as depicted in figs. 1 and 2, for ensureing that upper and lower sleeve pipe better hangs connection, need to the angle of inclination of the lower end sidewall of upper sleeve pipe 1 is consistent with the angle of inclination design of the upper end sidewall of setting of casing 2, form funnel-shaped structure, this funnel-shaped structure can hang upper and lower sleeve pipe to connect, can stop the upper end of setting of casing 2 and the lower end of upper sleeve pipe 1 to depart from, make again the connecting portion contact area of upper and lower sleeve pipe increase, can avoid gasifying agent to miss following rock stratum 32 to aquifer from the junction of upper and lower sleeve pipe.
In above-described embodiment, also need to consider the angle of inclination of the upper end sidewall of the angle of inclination of the lower end sidewall of upper sleeve pipe 1 and setting of casing 2 to be all designed to 3 °～5 °, the angle of inclination of 3 °～5 ° all can ensure that the lower end of sleeve pipe 1 and the upper end of setting of casing 2 form funnel-shaped structure, and make upper and lower sleeve pipe 2 better hang and connect, the connecting portion contact area of upper and lower sleeve pipe is increased, avoid gasifying agent to miss following rock stratum 32 to aquifer from the junction of upper and lower sleeve pipe.
As preferably, the angle of inclination of the upper end sidewall of the angle of inclination of the lower end sidewall of upper sleeve pipe 1 and setting of casing 2 is all designed to 4 °, the angle of inclination of the upper end sidewall of the angle of inclination of the lower end sidewall of upper sleeve pipe 1 and setting of casing 2 is all designed to 4 °, can ensure that the lower end of sleeve pipe 1 and the upper end of setting of casing 2 form funnel-shaped structure, and it is best to make upper and lower sleeve pipe 2 suspensions connect effect, at utmost avoids gasifying agent to miss following rock stratum 32 to aquifer from the junction of upper and lower sleeve pipe.
The present invention embodiment on the other hand also provides a kind of underground coal gasification(UCG) to enter, air outlet hole structure, comprise the upper sleeve pipe installing hole and the setting of casing installing hole that are located along the same line and communicate with each other, also comprise the underground coal gasification(UCG) sleeve pipe described in above-mentioned arbitrary embodiment, described upper sleeve pipe 1 is fixedly installed in described upper sleeve pipe installing hole, described setting of casing 2 is freely arranged in described setting of casing installing hole, as shown in Figure 2, due in the time that sleeve pipe is used for venthole, the gas of giving vent to anger can carry the gentle state of tiny lime-ash secretly and one of aqueous water is discharged venthole, along with the growth of the time of giving vent to anger, these tiny lime-ash will be with water mixed deposit to upper, cased connecting portion, the given vent to anger high temperature action of gas, it is very hard that these deposits will become, thereby stop the upwards expansion of setting of casing 2, the impact that makes setting of casing 2 produce external force to upper sleeve pipe 1 increases, and then making sleeve pipe 1 destroy the air hole structure in aquifer, top 4 and the water in aquifer, top 4, to import possibility in stove larger, be difficult to ensure normally carrying out of Underground Coal Gasification Process, and after the lower end of the upper end of setting of casing 2 and upper sleeve pipe 1 adopts funnel-shaped structure to be connected, on, setting of casing connecting portion transitions smooth, can form hardly and affect the deposit that setting of casing 2 upwards expands, thereby be conducive to the operation of sleeve pipe, especially more favourable to venthole.
The underground coal gasification(UCG) providing in each embodiment due to the underground coal gasification(UCG) sleeve pipe using in the underground coal gasification(UCG) inlet, outlet pore structure of the present embodiment and above-mentioned underground coal gasification(UCG) sleeve pipe is identical with sleeve pipe, therefore the two can solve identical technical problem, and reaches identical Expected Results.
Concrete, as shown in Figure 2, upper sleeve pipe 1 is connected with upper sleeve pipe installing hole by cementing concrete ring 4, because the part on the lower side of upper sleeve pipe 1 is nearer with aquifer 4, this part is also to need fixing key position, the upper end of setting of casing 2 all adopts funnel-shaped structure to be connected with the lower end of upper sleeve pipe 1, upper sleeve pipe 1 is the closer to bottom, itself and aquifer are just larger with the annular clearance of mantlerock 31, the sleeve pipe at position and the annular clearance of rock stratum of easy water guide have been increased, need not strengthen creep into naked bore dia in the situation that, the thickness of the cementing concrete ring 5 at easy water guide position is increased, the vulnerable area of sleeve pipe installing hole has been played to better protective effect, and then the water that prevents aquifer 4 imports in stove.
For guaranteeing that under Different Strata structure, Underground Coal Gasification Process all normally carries out, need to consider the Position Design of upper sleeve pipe 1, the distance in the soffit of the Position Design of upper sleeve pipe 1 and upper sleeve pipe 1 and aquifer 4, the soffit of upper sleeve pipe 1 has relation with the distance of coal seam to be gasified 6 end faces and the thickness in coal seam to be gasified 6, because the Yu Qi aquifer, lower end of upper sleeve pipe 1 is positions of the easiest water guide with mantlerock 31 places, also be the part that upper sleeve pipe is installed Kongzui weakness, can be by aquifer nearest in distance coal seam 6 to be gasified the soffit design of upper sleeve pipe 1 below 4, and the distance in the soffit of upper sleeve pipe 1 and aquifer 4 is designed to be greater than 5 meters, can reduce the possibility that the water in nearest aquifer 4, distance coal seam 6 to be gasified enters coal seam 6 to be gasified, possibility for reducing to emit the backward geostatic stress producing to damage, make the water in cementing concrete ring loose or dislocation, aquifer 4 to enter coal seam 6 to be gasified to upper and lower sleeve pipe due to roof simultaneously, because the stratum between aquifer 4 and coal seam to be gasified 6 is too thin, along with the carrying out of coal seam to be gasified 6 gasifications, this stratum loses support, there is inbreak, the geostatic stress producing can be to upper, setting of casing damages, thereby break sleeve pipe, the water in aquifer 4 is entered in stove, therefore, need to consider the soffit of upper sleeve pipe 1 larger with the distance design of coal seam to be gasified 6 end faces, facts have proved, the distance of the soffit of upper sleeve pipe 1 and coal seam to be gasified 6 end faces is designed to be greater than to 5 times of coal seam to be gasified 6 thickness, can avoid the stratum between aquifer 4 and coal seam to be gasified 6 that inbreak occurs, guarantee normally carrying out of coal seam to be gasified 6 gasifications.
As above-described embodiment, because the Yu Qi aquifer, lower end of upper sleeve pipe 1 is positions of the easiest water guide with mantlerock 31 places, also be the part that upper sleeve pipe is installed Kongzui weakness, can be by aquifer nearest in distance coal seam 6 to be gasified the soffit design of upper sleeve pipe 1 below 4, and the distance in the soffit of upper sleeve pipe 1 and aquifer 4 is designed to 10 meters, again upper sleeve pipe 1 is all connected with upper sleeve pipe installing hole by cementing concrete ring 5, can ensure that aquifer 4 is fixed extremely, the possibility that makes the water in nearest aquifer 4, distance coal seam 6 to be gasified enter coal seam 6 to be gasified becomes less, meanwhile, the soffit of upper sleeve pipe 1 and the distance of coal seam to be gasified 6 end faces are designed to 40 meters, can make the possibility of the stratum generation inbreak between aquifer 4 and coal seam to be gasified 6 also become less, guarantee normally carrying out of coal seam to be gasified 6 gasifications.
Form and wait by those skilled in the art is known about other of the underground coal gasification(UCG) inlet, outlet pore structure of the embodiment of the present invention, no longer describe in detail at this.
In the description of this manual, specific features, structure, material or feature can be with suitable mode combinations in any one or more embodiment or example.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of described claim.