CN113153211A - Two-plug two-injection hole sealing device and hole sealing method - Google Patents
Two-plug two-injection hole sealing device and hole sealing method Download PDFInfo
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- CN113153211A CN113153211A CN202110377913.5A CN202110377913A CN113153211A CN 113153211 A CN113153211 A CN 113153211A CN 202110377913 A CN202110377913 A CN 202110377913A CN 113153211 A CN113153211 A CN 113153211A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
- E21B33/134—Bridging plugs
Abstract
The invention discloses a two-plug two-injection hole sealing device and a hole sealing method, wherein the hole sealing device comprises an outer plugging bag, an inner plugging bag, a first grouting pipe and a second grouting pipe, the outer plugging bag and the inner plugging bag are arranged in a drill hole at intervals along the length direction of the drill hole, a grouting section is arranged between the outer plugging bag and the inner plugging bag, the outer plugging bag and the inner plugging bag are both arranged between an extraction pipe and the hole wall of the drill hole, the first grouting pipe sequentially penetrates through the outer plugging bag, the grouting section and the inner plugging bag, a first explosion valve is further arranged on the first grouting pipe, the second grouting pipe penetrates through the outer plugging bag, and a second explosion valve is arranged on the second grouting pipe. According to the two-plugging two-injection hole sealing device provided by the embodiment of the invention, gas extraction and leakage in the gas extraction process can be effectively avoided through two times of grouting respectively, and the gas extraction concentration of a drilled hole and the gas extraction rate of a working face are improved.
Description
Technical Field
The invention relates to the technical field of gas extraction, in particular to a two-plug two-injection hole sealing device and a hole sealing method.
Background
With the rapid development of coal mining technology and equipment, the depth of deep mining or development extension of the mine is over 800m at present, and the mining depth of part of the mine is over 1000m at present. After coal is mined and enters a deep part, the coal bed is in a complex mechanical environment with disturbance of three heights and one height. After the drill hole is sealed and extraction is carried out for a certain time, due to the creep characteristic of the coal body and the influence of the complex mechanical environment of the deep coal bed, the coal body cracks around the drill hole grow and expand again to generate an air leakage channel, so that the extraction concentration is reduced, and the effective extraction period of the extraction drill hole is shortened. For coal mines, gas extraction is to drill a borehole in a gas gathering area of a coal seam, connect the borehole to a special pipeline and plug the borehole, and then use extraction equipment to extract gas in the coal seam and a goaf to the ground. The extracted gas can not only reduce the gas emission amount in the mining process and prevent the gas from exceeding the limit and accumulating, but also is an important measure for preventing gas explosion and coal and gas outburst accidents, and can also change harm into benefit and develop and utilize coal associated resources.
In the related technology, the primary plugging of the drilling hole adopts a 'two-plugging one-grouting' grouting hole packer, and two plugging bags are grouted by a grouting pipe. When the grouting pressure is greater than the opening pressure of the explosion valve, the explosion valve is opened and grouting is performed on the grouting section between the two bags, and the grouting condition of the grouting pipe on the drill hole is controlled by adjusting the pressure of the grouting pump. However, the traditional 'two-plug one-injection' hole packer judges the grouting state by using the grouting pressure in the using process, and can not intuitively explain whether the drilling hole is filled with the grout or not. When the inner and outer plugging bags expand to reach an ideal plugging state, a closed space is formed between the two plugging bags of the drill hole, the internal gas pressure increases along with the gradual increase of the pressure of the grouting pump to obstruct the grouting of the grouting pump, when the internal pressure and the external pressure reach balance, the gas in a grouting section cannot be completely discharged, the slurry is not solidified compactly, the solidified slurry is easy to deform and loosen after being extracted for a long time, and after the deep coal bed deforms, the cracks around the hole wall can form new through cracks to fail to achieve a good sealing effect, so that the gas extraction concentration is reduced, and the gas extraction rate of the working face is reduced.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
For gas extraction drill holes, especially deep coal seam gas extraction drill holes, due to the fact that the deep coal seam gas extraction drill holes are located in complex mechanical environments such as drilling disturbance and roadway disturbance, cracks are newly added to the drill holes in the later extraction period, and the drill hole plugging effect is reduced. Therefore, the embodiment of the invention provides a two-plug and two-injection hole sealing device, which is further developed and proposed on the basis of a two-plug one-injection one-discharge hole sealing device and a use method (CN108119094A) of a deep coal seam gas extraction drill hole. The hole sealing device can effectively seal a drilled hole, and the gas extraction concentration is improved.
The embodiment of the invention also provides a hole sealing method.
The two-plugging two-grouting hole sealing device comprises an outer plugging bag, an inner plugging bag, a first grouting pipe and a second grouting pipe, wherein the outer plugging bag and the inner plugging bag are arranged in a drill hole at intervals along the length direction of the drill hole, the inner plugging bag is positioned on one side, away from the drill hole opening, of the outer plugging bag, a grouting section is arranged between the outer plugging bag and the inner plugging bag, the outer plugging bag and the inner plugging bag are uniformly arranged between an extraction pipe and the hole wall of the drill hole, the first grouting pipe sequentially penetrates through the outer plugging bag, the grouting section and the inner plugging bag, the first grouting pipe is respectively communicated with the outer plugging bag and the inner plugging bag, a first explosion valve is further arranged on the first grouting pipe, the first explosion valve is positioned in the grouting section, and the second grouting pipe penetrates through the outer plugging bag, and one end of the second grouting pipe is positioned in the grouting section, and a second blasting valve is further arranged on the second grouting pipe and positioned in the grouting section.
According to the two-plug two-injection hole sealing device provided by the embodiment of the invention, the hole sealing is carried out on the drill hole in a two-plug two-injection mode, so that the fracture generated by deformation and displacement of the deep coal seam can be sealed again, the problems of poor hole sealing, hole sealing failure and the like caused by the generation of the regeneration fracture in the complex stress environment of the deep coal seam gas extraction drill hole can be effectively solved, and the gas extraction concentration of the drill hole and the gas extraction rate of the working face are obviously improved.
In some embodiments, the first grouting pipe is further provided with a first one-way valve and a second one-way valve, the first one-way valve is located in the outer plugging pouch, and the second one-way valve is located in the inner plugging pouch.
In some embodiments, the second grouting pipe is further provided with a slurry blocking water filter screen, and the slurry blocking water filter screen is located in the grouting section.
In some embodiments, a first control valve is arranged at one end of the first grouting pipe far away from the first blasting valve, and a second control valve is arranged at one end of the second grouting pipe far away from the second blasting valve.
In some embodiments, the first grouting pipe and the extraction pipe are parallel to each other, and the second grouting pipe and the extraction pipe are parallel to each other.
In some embodiments, the sealing device further comprises a clamp, the first grouting pipe penetrates through the outer sealing bag and the inner sealing bag and is fixed on the outer sealing bag and the inner sealing bag in a sealing manner through the clamp, and the second grouting pipe penetrates through the outer sealing bag and is fixed on the outer sealing bag in a sealing manner through the clamp.
In some embodiments, the bore hole is a horizontal bore hole, the slurry blocking water filter screen is adjacent to the outer plugging bag, the second burst valve is located between the outer plugging bag and the slurry blocking water filter screen, the distance between the slurry blocking water filter screen and the outer plugging bag is 5-10cm, the distance between the slurry blocking water filter screen and the second burst valve is 5cm, and the distance between the first burst valve and the inner plugging bag is 10-20 cm.
In some embodiments, the bore hole is an upward bore hole, the second burst valve is adjacent to the inner plugging bag, the slurry blocking water filter screen is located between the outer plugging bag and the second burst valve, the distance between the second burst valve and the inner plugging bag is 5-10cm, the distance between the slurry blocking water filter screen and the second burst valve is 5cm, and the distance between the slurry blocking water filter screen and the first burst valve is 20-30 cm.
In some embodiments, the borehole is a down-hole, the slurry blocking water filter net is adjacent to the outer plugging bag, the second blasting valve is located between the outer plugging bag and the slurry blocking water filter net, the distance between the slurry blocking water filter net and the outer plugging bag is 5-10cm, the distance between the slurry blocking water filter net and the second blasting valve is 5cm, and the distance between the slurry blocking water filter net and the first blasting valve is 20-30 cm.
According to another aspect of the invention, the hole sealing method comprises the following steps: opening a first control valve, grouting into a first grouting pipe, enabling slurry to enter an outer plugging bag and an inner plugging bag through the first grouting pipe, and enabling the outer plugging bag and the inner plugging bag to be tightly attached to the wall of a drill hole after being expanded; when the pressure in the first grouting pipe exceeds the opening pressure of a first explosion valve, the first explosion valve is opened, the grout is injected into a grouting section through the first grouting pipe and the first explosion valve, and the air in the grouting section is discharged through a second grouting pipe; when accumulated water in the second grouting pipe is discharged, closing the second control valve, and continuing grouting until the grouting pressure reaches a specified value, and closing the first control valve; and when the concentration of the coal seam gas extraction drill hole is reduced to a large extent or a gas leakage channel exists in the coal body around the gas extraction drill hole, opening the second control valve, grouting into the second grouting pipe, opening the second blasting valve when the grouting pressure is greater than the opening pressure of the second blasting valve, injecting the slurry into the air pocket in the grouting section and the crack generated by deformation and displacement of the deep coal seam through the second grouting pipe until the slurry seeps out from the wall surface of the roadway around the hole opening of the drill hole, stopping grouting, and closing the second control valve.
Drawings
FIG. 1 is a schematic view of a two-port two-injection-hole apparatus according to a first embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic view of a sealing device according to a second embodiment of the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 3 at B;
FIG. 5 is a schematic view of a sealing device according to a third embodiment of the present invention;
FIG. 6 is an enlarged view of a portion of FIG. 5 at C;
reference numerals:
the outer side of the blocking bag 1 is sealed,
the inner sealing bag (2) is provided with a plurality of sealing bags,
a first grouting pipe 3, a first burst valve 31, a first check valve 32, a second check valve 33, a first control valve 34,
a second grouting pipe 4, a second explosion valve 41, a slurry blocking water strainer 42, a second control valve 43,
the clamping band (5) is provided with a clamping band,
and an extraction pipe 6.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1-6, the two-plugging two-hole injection device according to the embodiment of the invention includes an outer plugging bag 1, an inner plugging bag 2, a first grouting pipe 3 and a second grouting pipe 4, the outer plugging bag 1 and the inner plugging bag 2 are arranged in a drill hole at intervals along the length direction of the drill hole, the inner plugging bag 2 is located on one side of the outer plugging bag 1 away from the drill hole opening, a grouting section is arranged between the outer plugging bag 1 and the inner plugging bag 2, and both the outer plugging bag 1 and the inner plugging bag 2 are arranged between an extraction pipe 6 and the hole wall of the drill hole.
It should be noted that both the outer plugging bag 1 and the inner plugging bag 2 can be grouted, after grouting, the outer plugging bag 1 and the inner plugging bag 2 expand and plug the gap between the extraction pipe 6 and the hole wall of the drill hole, a sealed grouting section is formed between the two sealing bags, and after the grouting section is filled with slurry through the grouting pipe, the gap between the extraction pipe 6 and the hole wall of the drill hole can be sealed.
First slip casting pipe 3 is used for the slip casting in outside shutoff bag 1, interior shutoff bag 2 and the slip casting section, and this slip casting is first slip casting, specifically, first slip casting pipe 3 passes outer shutoff bag 1, slip casting section and interior shutoff bag 2 in proper order, and first slip casting pipe 3 communicates with outer shutoff bag 1 and interior shutoff bag 2 respectively, still is equipped with first blasting valve 31 on first slip casting pipe 3, and first blasting valve 31 is located the slip casting section.
When grouting for the first time, grouting is performed in the first grouting pipe 3 through the outward plugging bag 1 and the inner plugging bag 2, the outer plugging bag 1 and the inner plugging bag are tightly attached to the wall of a drill hole after expanding, grouting is continued at the moment, when the grouting pressure of the first grouting pipe 3 is greater than the opening pressure of the first explosion valve 31, the first explosion valve 31 is opened, and the first grouting pipe 3 performs grouting into a grouting section until the grouting pressure reaches a specified value, so that the first grouting is completed.
After the first grouting, the deep coal seam is influenced by a complex mechanical environment, and the coal body around the drill hole deforms to cause cracks at the grouting section and the drill hole periphery. In order to shorten the extraction period and improve the extraction efficiency, the second grouting is performed through the second grouting pipe 4, specifically, the second grouting pipe 4 penetrates through the outer plugging bag 1, one end of the second grouting pipe 4 is located outside the drill hole, the other end of the grouting pipe is located in the grouting section, and the second grouting pipe 4 located in the grouting section is further provided with a second explosion valve 41. It should be noted that, during the first time of slip casting, the gas accessible second slip casting pipe 4 in the slip casting section is discharged to effectively reduce the production in air pocket, improve effective shutoff length, second slip casting pipe 4 can also replace first slip casting pipe 3 to carry out the slip casting under the early prerequisite of exploding of first blasting valve 31, avoids drilling hole sealing failure.
And during the second grouting, grouting through the second grouting pipe 4, when the grouting pressure is greater than the opening pressure of the second blasting valve 41, opening the second blasting valve 41, and injecting the grout into the air pocket in the grouting section and the crack generated by deformation and displacement of the deep coal seam through the second grouting pipe 4 until the grout seeps out from the wall surface of the roadway around the orifice of the drill hole, stopping grouting, and finishing the second grouting.
According to the two-plug two-injection hole sealing device provided by the embodiment of the invention, the deep coal seam gas extraction drill hole is sealed in a two-plug two-injection mode, and the fracture generated by deformation and displacement of the deep coal seam can be sealed again through second grouting, so that the problems of untight sealing, failure sealing and the like of the deep coal seam gas extraction drill hole can be effectively solved, the gas extraction leakage in the gas extraction process is avoided, and the gas extraction concentration of the drill hole and the gas extraction rate of a working face are obviously improved.
The device has the following advantages:
1) the first hole sealing can discharge gas in the grouting section by using the second grouting pipe 4, so that the generation of air pockets is effectively reduced, and the effective sealing length is increased;
2) the grouting pressure of a grouting pump can be effectively reduced by adjusting the position of the second burst valve 41 aiming at different arrangement directions of the drilled hole;
3) the hole sealing process of two-plugging and two-injecting reduces the complexity of the traditional hole sealing for two times, and the grouting is completed through the second grouting pipe 4 at one time.
In some embodiments, the first grouting pipe 3 is further provided with a first one-way valve 32 and a second one-way valve 33, the first one-way valve 32 is located in the outer occlusion bladder 1, and the second one-way valve 33 is located in the inner occlusion bladder 2.
So set up, slip casting in the outside shutoff bag 1 of first slip casting pipe 3 accessible first check valve 32, slip casting in the inside shutoff bag 2 of first slip casting pipe 3 accessible second check valve 33 to first check valve 32 and second check valve 33 can prevent effectively that the thick liquid from flowing backward in first slip casting pipe 3.
The first grouting pipe 3 is provided with a first control valve 34, the first control valve 34 is arranged at one end of the first grouting pipe far away from the first explosion valve 31, and the first control valve 34 is used for controlling the on-off of the first grouting pipe 3.
The second grouting pipe 4 is also provided with a second control valve 43 and a slurry blocking water filter net 42, the second control valve 43 is arranged at one end of the second grouting pipe 4, which is positioned at the outer side of a drilled hole, the slurry blocking water filter net 42 is positioned in the grouting section, and the orientation of the drilling hole can be adjusted. The second control valve 43 is used for controlling the on-off of the second grouting pipe 4, and the slurry blocking water filtering net 42 is used for filtering water and gas in the grouting section, so that broken stones or impurities in the grouting section are prevented from entering the second grouting pipe 4 to block the second grouting pipe 4.
In some embodiments, the first slip casting pipe 3 and the extraction pipe 6 are parallel to each other, and the second slip casting pipe 4 and the extraction pipe 6 are parallel to each other. In other words, any two of the first grouting pipe 3, the second grouting pipe 4 and the extraction pipe 6 are parallel to each other, and in the construction process, the first grouting pipe 3 and the second grouting pipe 4 are tightly attached to the extraction pipe 6, so that the first grouting pipe 3 and the second grouting pipe 4 can be ensured to extend into the drill hole along the extension direction of the extraction pipe 6.
In some embodiments, the sealing device further comprises a plurality of clamps 5, the first grouting pipe 3 is hermetically fixed on the outer sealing bag 1 and the inner sealing bag 2 through the clamps 5, and the second grouting pipe 4 is hermetically fixed on the outer sealing bag 1 through the clamps 5.
Specifically, be equipped with four clamps 5 on first slip casting pipe 3, wherein two clamps 5 are located the both ends of outer shutoff bag 1 on drilling length direction, play the fixed action at the both ends of outer shutoff bag 1, prevent to pour into the thick liquid outflow in the outer shutoff bag 1. The other two clamps 5 are positioned at the two ends of the inner plugging bag 2 in the length direction of the drilled hole, play a role in fixing the two ends of the inner plugging bag 2 and prevent the grout injected into the outer plugging bag 2 from flowing out.
Two clamps 5 are arranged on the second grouting pipe 4, the two clamps 5 are positioned at two ends of the outer plugging bag 1 in the length direction of the drilled hole, the two ends of the outer plugging bag 1 are fixed, and the grout injected into the outer plugging bag 1 is prevented from flowing out.
The drilling mode has various modes, such as an upward drilling mode, a downward drilling mode and a horizontal drilling mode, and the two-plug two-grouting-hole sealing device according to the embodiment of the invention can effectively reduce the grouting pressure of a grouting pump by adjusting the positions of the first blasting valve 31 and the second blasting valve 41 aiming at different arrangement orientations of the drilling holes.
As shown in fig. 1, when the drilling hole is a horizontal drilling hole, the slurry blocking water filter net 42 is adjacent to the outer blocking bag 1, the second blasting valve 41 is located between the outer blocking bag 1 and the slurry blocking water filter net 42, the distance between the slurry blocking water filter net 42 and the outer blocking bag 1 is 5-10cm, the distance between the slurry blocking water filter net and the second blasting valve 41 is 5cm, and the distance between the first blasting valve 31 and the inner blocking bag 2 is 10-20 cm.
As shown in fig. 2, when the drilling hole is an upward drilling hole, the second burst valve 41 is adjacent to the inner plugging bag 2, the slurry blocking water filter net 42 is located between the outer plugging bag 1 and the second burst valve 41, the distance between the second burst valve 41 and the inner plugging bag 2 is 5-10cm, the distance between the slurry blocking water filter net 42 and the second burst valve 41 is 5cm, and the distance between the slurry blocking water filter net 42 and the first burst valve 31 is 20-30 cm.
As shown in fig. 3, when the borehole is a down borehole, the slurry blocking water filter net 42 is adjacent to the outer blocking bag 1, the second explosion valve 41 is located between the outer blocking bag 1 and the slurry blocking water filter net 42, the distance between the slurry blocking water filter net 42 and the outer blocking bag 1 is 5-10cm, the distance between the slurry blocking water filter net 42 and the second explosion valve 41 is 5cm, and the distance between the slurry blocking water filter net 42 and the first explosion valve 31 is 20-30 cm.
The embodiment of the invention also provides a hole sealing method, which specifically comprises the following steps:
1) opening a first control valve 34, leading to a first grouting pipe 3 for grouting, enabling the grout to enter an outer plugging bag 1 and an inner plugging bag 2 through the first grouting pipe 3, and enabling the outer plugging bag 1 and the inner plugging bag 2 to be tightly attached to the wall of a drilling hole after being expanded;
2) when the pressure in the first grouting pipe 3 exceeds the opening pressure of the first explosion valve 31, the first explosion valve 31 is opened, the slurry is injected into the grouting section through the first grouting pipe 3 and the first explosion valve 31, and air and water in the grouting section enter the second grouting pipe 4 through the slurry blocking water filter 42 and are discharged;
3) when accumulated water in the second grouting pipe 4 is discharged, the whole grouting section is filled with the grout, at the moment, the second control valve 43 on the second grouting pipe 4 is closed, grouting is continued until the grouting pressure reaches a specified value, the first control valve 34 is closed, and primary grouting is completed;
4) when the concentration of the coal seam gas extraction borehole is reduced to a large extent or a gas leakage channel exists in the coal body around the gas extraction borehole, the second control valve 43 is opened, grouting is conducted into the second grouting pipe 4, when the grouting pressure is larger than the opening pressure of the second blasting valve 41, the second blasting valve 41 is opened, the grout is injected into the air pocket in the grouting section and the crack generated by deformation and displacement of the deep coal seam through the second grouting pipe 4 until the grout seeps out from the wall surface of the roadway around the orifice of the borehole, grouting is stopped, and the second control valve 43 is closed. At the moment, the slurry enters gaps on the wall of the drill hole outside the extraction pipe 1 and coal body cracks at a certain depth around the drill hole until the slurry is filled in the cracks in the coal body around the drill hole, and secondary grouting is completed.
According to the hole sealing method provided by the embodiment of the invention, air pockets and cracks in the drill hole can be fully sealed, cracks generated by coal seam displacement deformation at the periphery of the drill hole can be sealed again, the problems of complex operation, waste of manpower and material resources and the like caused by traditional hole sealing are solved, meanwhile, the effective drainage period of the drainage drill hole is shortened, the hole sealing quality is ensured, the problems of untight hole sealing and drainage gas leakage are solved, and the drainage concentration is improved.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A two-plug two-injection hole sealing device is characterized by comprising:
the drilling device comprises an outer plugging bag and an inner plugging bag, wherein the outer plugging bag and the inner plugging bag are arranged in a drill hole at intervals along the length direction of the drill hole, the inner plugging bag is positioned on one side, away from the drill hole orifice, of the outer plugging bag, a grouting section is arranged between the outer plugging bag and the inner plugging bag, and both the outer plugging bag and the inner plugging bag are arranged between an extraction pipe and the hole wall of the drill hole;
the first grouting pipe sequentially penetrates through the outer plugging bag, the grouting section and the inner plugging bag, the first grouting pipe is respectively communicated with the outer plugging bag and the inner plugging bag, and a first blasting valve is further arranged on the first grouting pipe and positioned in the grouting section;
and the second grouting pipe penetrates through the outer plugging bag, one end of the second grouting pipe is positioned in the grouting section, and a second explosion valve is also arranged on the second grouting pipe and positioned in the grouting section.
2. The two-port two-way orifice device according to claim 1, wherein the first grouting pipe is further provided with a first one-way valve and a second one-way valve, the first one-way valve is located in the outer plugging pocket, and the second one-way valve is located in the inner plugging pocket.
3. The two-port two-shot hole sealing device according to claim 1, wherein a first control valve is provided at an end of the first shot pipe remote from the first burst valve, and a second control valve is provided at an end of the second shot pipe remote from the second burst valve.
4. The two-plug two-hole injection device according to claim 1, wherein the second injection pipe is further provided with a slurry blocking water filter net, and the slurry blocking water filter net is positioned in the injection section.
5. The two-plug two-injection hole sealing device according to claim 1, wherein the first injection pipe and the extraction pipe are parallel to each other, and the second injection pipe and the extraction pipe are parallel to each other.
6. The two-port injection device according to claim 1, further comprising a clamp, wherein the first injection tube passes through and is sealingly fixed to the outer and inner plugging bladders by the clamp, and the second injection tube passes through and is sealingly fixed to the outer plugging bladder by the clamp.
7. The two-block two-injection hole sealing device according to claim 4, wherein the drilling hole is a horizontal drilling hole, the slurry blocking water filter screen is adjacent to the outer blocking bag, the second explosion valve is located between the outer blocking bag and the slurry blocking water filter screen, the distance between the slurry blocking water filter screen and the outer blocking bag is 5-10cm, the distance between the slurry blocking water filter screen and the second explosion valve is 5cm, and the distance between the first explosion valve and the inner blocking bag is 10-20 cm.
8. The two-plug two-injection hole sealing device according to claim 4, wherein the drilling hole is an upward drilling hole, the second blasting valve is adjacent to the inner plugging bag, the slurry blocking water filter screen is located between the outer plugging bag and the second blasting valve, the distance between the second blasting valve and the inner plugging bag is 5-10cm, the distance between the slurry blocking water filter screen and the second blasting valve is 5cm, and the distance between the slurry blocking water filter screen and the first blasting valve is 20-30 cm.
9. The two-plug two-injection hole sealing device according to claim 4, wherein the drill hole is a down-hole drill hole, the slurry blocking water filter screen is adjacent to the outer plugging bag, the second explosion valve is located between the outer plugging bag and the slurry blocking water filter screen, the distance between the slurry blocking water filter screen and the outer plugging bag is 5-10cm, the distance between the slurry blocking water filter screen and the second explosion valve is 5cm, and the distance between the slurry blocking water filter screen and the first explosion valve is 20-30 cm.
10. A method of sealing a hole, comprising:
opening a first control valve, grouting into a first grouting pipe, enabling slurry to enter an outer plugging bag and an inner plugging bag through the first grouting pipe, and enabling the outer plugging bag and the inner plugging bag to be tightly attached to the wall of a drill hole after being expanded;
when the pressure in the first grouting pipe exceeds the opening pressure of a first explosion valve, the first explosion valve is opened, the grout is injected into a grouting section through the first grouting pipe and the first explosion valve, and the air in the grouting section is discharged through a second grouting pipe;
when accumulated water in the second grouting pipe is discharged, closing the second control valve, continuing grouting until the grouting pressure reaches a specified value, and closing the first control valve;
and when the concentration of the coal seam gas extraction drill hole is reduced to a large extent or a gas leakage channel exists in the coal body around the gas extraction drill hole, opening the second control valve, grouting into the second grouting pipe, opening the second blasting valve when the grouting pressure is greater than the opening pressure of the second blasting valve, injecting the slurry into the air pocket in the grouting section and the crack generated by deformation and displacement of the deep coal seam through the second grouting pipe until the slurry seeps out from the wall surface of the roadway around the hole opening of the drill hole, stopping grouting, and closing the second control valve.
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