CN213269850U - Directional long-drill-hole cross-layer gas extraction system - Google Patents
Directional long-drill-hole cross-layer gas extraction system Download PDFInfo
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- CN213269850U CN213269850U CN202021919707.XU CN202021919707U CN213269850U CN 213269850 U CN213269850 U CN 213269850U CN 202021919707 U CN202021919707 U CN 202021919707U CN 213269850 U CN213269850 U CN 213269850U
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Abstract
The utility model discloses a directional long drilling cross bed gas drainage system, include a plurality of drilling holes of seting up on the main bore along a plurality of groups main bore and the range that wind tunnel design length direction was seted up, in the drilling hole cross bed extends to the coal seam, the drilling hole that corresponds on at least one main bore extends to wind tunnel design position department. The utility model discloses the system of taking out not only can realize taking out the gas in advance of working face return airway strip within range, can also take out upper corner gas moreover during the working face stope.
Description
Technical Field
The utility model relates to a technical field is administered to colliery gas, in particular to directional long drilling cross-layer gas drainage system.
Background
The most difficult place for controlling the gas overrun of the coal mine is the upper corner of the U-shaped ventilation of the coal face. The upper corners of the coal face are where the gas is most likely to collect. The traditional method for controlling the gas overrun of the upper corner comprises the steps of pipe laying drainage, installing a local ventilator, increasing the air quantity of a working face, installing an air-water ejector, arranging a special exhaust tunnel, exhausting gas at a high position, arranging a wind screen, arranging a goaf air barrier, changing a ventilation mode and the like. The above method may increase wind resistance in the tunnel or complicate the ventilation tunnel and thus increase ventilation cost, or require purposely increased safety management, resulting in complicated management and increased uncertainty.
Therefore, based on the above problems, there is a need for a directional long borehole cross-layer gas extraction system, which can treat upper corner gas while realizing gas pre-extraction.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a directional long drilling cut-through gas drainage system, this system still can administer upper corner gas when realizing that gas is taken out in advance.
The utility model discloses a directional long drilling cross bed gas drainage system, include along a plurality of groups main bore holes that wind tunnel design length direction was seted up and arrange a plurality of branch drill holes of seting up on the main bore hole, in branch drill hole cross bed extended to the coal seam, the branch drill hole that corresponds on at least one main bore hole extended to wind tunnel design position department.
Further, the main drilling holes are divided into two groups, namely an inner side main drilling hole located on the inner side of the air way design position and an outer side main drilling hole located on the outer side of the air way design position.
Further, the outer main bore opens into the immediate roof.
Further, the inner main bore is opened in the old roof.
Furthermore, branch drill holes extending to the designed position of the air way are formed in the main drill hole, close to the designed position of the air way, in the outer main drill hole.
Furthermore, two groups of branch drill holes are branched from the main drill hole and distributed on the inner side and the outer side of the main drill hole.
Furthermore, the branch drilling hole extending to the designed position of the air way is communicated with the upper position of the middle part of the designed section of the air way.
Further, for the slowly inclined and nearly horizontal coal seam, the distribution range of the drill holes on the inner side and the outer side of the air way is 15m larger than that on the inner side and the outer side of the air way.
Further, for inclined and steeply inclined coal seams, the distribution range of the drill holes on the side of the air way which inclines upwards along the coal seam is larger than the distance of 20m from the side of the air way, and the distribution range of the drill holes on the side of the air way which inclines downwards along the coal seam is larger than the distance of 10m from the side of the air way.
The utility model has the advantages that:
the utility model discloses take out and adopt the system not only can realize taking out the gas in advance of working face return air roadway strip within range, can also take out and adopt upper corner gas during working face stoping, and the inboard main bore hole can also be regarded as the high-order crack gas of collecting space area and take out the main bore, play the effect of taking out the lane highly; the extraction system does not affect the whole ventilation system, does not increase the ventilation cost, does not need targeted safety management, and simplifies the safety management process;
drawings
The invention is further described with reference to the following figures and examples.
FIG. 1 is a schematic view of a venting arrangement;
FIG. 2 is a schematic plan structure diagram of an extraction system;
FIG. 3 is a schematic sectional view of I-I of FIG. 2;
FIG. 4 is a schematic sectional view of II-II of FIG. 2;
FIG. 5 is a schematic cross-sectional view of III-III of FIG. 2;
FIG. 6 is a schematic diagram of an upper corner extraction structure;
FIG. 7 is a schematic view of an annular fracture ring extraction structure;
Detailed Description
FIG. 1 is a schematic view of a venting arrangement; FIG. 2 is a schematic plan structure diagram of an extraction system; FIG. 3 is a schematic sectional view of I-I of FIG. 2; FIG. 4 is a schematic sectional view of II-II of FIG. 2; FIG. 5 is a schematic cross-sectional view of III-III of FIG. 2; FIG. 6 is a schematic diagram of an upper corner extraction structure; FIG. 7 is a schematic view of an annular fracture ring extraction structure;
as shown in the figure: the embodiment provides a directional long-drill-hole cross-layer gas extraction system which comprises a plurality of groups of main drill holes arranged along the designed length direction of an air roadway and a plurality of branch drill holes 2 arranged on the main drill holes, wherein the branch drill holes extend into a coal seam in a cross-layer mode, and the corresponding branch drill holes on at least one main drill hole extend to the designed position of the air roadway.
The working face return air lane of the air lane is provided with a drill pit 6 in a rail mountain 5, drilling of a main drill hole is realized in the drill pit, a position D represents the design position of the air lane, when the air lane is drilled for pre-pumping gas, the air lane does not start to be tunneled, when the tunneling requirement is met after pre-pumping gas, the tunneling air lane is excavated, and the air lane strip is pumped to ensure that the pumping effect reaches the coal seam gas pressure and the gas content is lower than the predicted critical value of a mine area, namely the requirement of the inspection of the regional measure effect is met; and the air drift tunneling can be carried out only when the regional measure effect inspection meets the requirement. The inner side and the outer side are two sides corresponding to the designed positions of the air tunnels, as shown in a combined graph 1, the point A is the position of an upper corner, the point B is the position of the inner side of the air tunnels, the point C is the position of the outer side of the air tunnels, wherein the point B is the area where a working face is located, and the point C corresponds to the reserved position of a coal pillar; in the embodiment, the main drill holes are arranged along the inclined direction of the rock stratum, and as shown in fig. 2 and fig. 3, the number of the main drill holes is determined according to design cross-layer drilling data, four main drill holes are drilled through a drilling pit in the embodiment, the position of an extraction drill hole is determined and further the position of the drilling pit is determined according to the extraction effective radius within the range of a designed working face air lane strip, the extraction effective radius is related to the permeability coefficient of the coal seam, and for low-permeability coal seams, the extraction effective radius of the coal seam can be improved by adopting methods such as hydraulic fracturing and hydraulic punching; drilling a main drilling hole from a drilling pit, wherein the main drilling hole is bent and then straight along the drilling pit to form four approximately parallel main drilling holes in a rock stratum, a branch drilling hole is drilled from the main drilling hole to a designed cross-layer drilling hole position, the bending angles of the main drilling hole and the branch drilling hole are determined according to the inclination adjusting angle allowed by a drilling machine and the designed drilling hole position, the drilling mode can be realized by the conventional drilling machine, and during drilling, extraction and air lane tunneling of the directional drilling machine, the drilling track is accurately controlled no matter whether the main drilling hole or the branch drilling hole is drilled, and the change of a small geological structure in an air lane strip is mastered in time; details are not described herein;
and the main drilling hole positioned outside the designed position of the air way and adjacent to the air way is also used as a main drilling hole for treating upper corner gas, a group of branch drilling holes penetrating to the upper wall of the air way are formed in the main drilling hole and used as the upper corner branch drilling holes 2a for treating, the branch drilling holes are also used as the drilling holes for drawing and releasing the upper corner of the working face during the stoping of the working face in the future, and when the upper wall drilling hole is encountered in the tunneling process of the air way, a local sleeve protection hole is timely arranged to prevent hole collapse caused by concentrated stress during the stoping of the working face in the future. Referring to fig. 6, the upper corner branch hole 2a near the working face penetrates the upper corner, and the upper corner branch hole 2a near the working face moves forward with the continuous advance of the working face, so that the gas at the upper corner is pumped and discharged during the mining of the coal face, and the pumping and discharging line is performed through the main hole near the upper side of the air way and the upper corner branch hole 2a penetrating the air way; because the gas concentration at the upper corner is not high in the treatment, the pumped gas can be discharged into a return air uphill or an upper main return airway of a mining area. The extraction system can realize pre-extraction of gas in the range of the return airway band of the working face, and can extract upper corner gas in the extraction period of the working face, the extraction system does not influence the whole ventilation system, does not increase the ventilation cost, does not need targeted safety management, and simplifies the safety management flow.
In this embodiment, the main drill holes are divided into two groups, that is, an inner main drill hole 1a located inside the air passage design position and an outer main drill hole 1b located outside the air passage design position. Referring to fig. 2 and 3, two inner main drill holes 1a and two outer main drill holes 1b are drilled on two sides of the designed position of the air way; the structure can realize comprehensive gas pre-extraction in the range of the strip of the return airway of the working face, and avoid the gas outburst hazard when the return airway is tunneled.
In this embodiment, the outer main bore 1b opens into the immediate roof 3. As shown in fig. 3 and 4, the drilling position of the outer main drilling hole 1b is closer to the coal bed, which is beneficial to drilling the branch drilling holes through the layer, and the coal pillars are reserved on the outer side of the designed position of the air way, so that the stability of the straight roof is better, the influence of the collapse of the goaf is avoided, the stability of the branch drilling holes is ensured, the pipeline is pre-embedded in the branch drilling holes, the collapse of the upper corner branch drilling holes 2a caused by the collapse of the goaf is prevented, and the reliability and the stability of the gas control of the upper corners are improved.
In this embodiment, the inner main bore hole 1a opens into the old roof 4. As shown in fig. 3 and 5, the inner side of the designed position of the air way belongs to the working face range, so that along with the advance of the working face, the direct roof at the inner side of the designed position of the air way continuously forms goaf collapse along with the advance of the working face, the stability of the old roof is better and only slight settlement occurs, the inner main drilling hole 1a is arranged in the old roof 4 to improve the stability of the inner main drilling hole 1a, so that the inner main drilling hole 1a is not damaged along with the goaf collapse, and in the process of coal mining, the gas extraction of an upper annular fracture ring close to the air way during the recovery of the coal mining working face is carried out by the inner main drilling hole penetrating through the upper rock stratum of the old roadway of the working face, and the extraction line is carried out by; the gas concentration of the annular fracture ring is high, and the annular fracture ring is required to be recycled through a mine permanent gas extraction system. The inner main drill hole 1a is just positioned in the annular fracture ring after the stoping of the working face, and the inner main drill hole 1a is used as a high-position fracture gas extraction main hole of the goaf in the future to play a role of high roadway extraction.
In this embodiment, the main bore hole close to the air passage design position in the outer main bore hole 1b is provided with a branch bore hole extending to the air passage design position. Referring to fig. 2 and 3, the upper corner branch hole 2a is branched from the outer main bore 1b adjacent to the designed position of the air passage, and the upper corner branch hole 2a is opened at a close position.
In this embodiment, the main bore is branched into two branch bores, and the two branch bores are distributed on the inner and outer sides of the main bore. The inner side and the outer side of the main drill holes are consistent with the inner side and the outer side corresponding to the air tunnels, wherein the side close to the working face along the coal seam direction is the inner side, and the side far away from the working face along the coal seam direction is the outer side, and as shown in a combined figure 3, two groups of branch drill holes are branched from the inner side and the outer side of the four main drill holes, and the branch drill holes penetrate downwards to be beneficial to expanding and extracting the range.
In this embodiment, the branch drill hole is communicated with the upper middle part of the designed section of the air way. As shown in fig. 3, the upper corner branch drilled hole 2a is communicated with the upper position of the middle part of the air way, and the gas density is lower, so that the gas collected at the upper corner can be pumped out easily when the gas at the upper corner is treated.
In this embodiment, for a slowly inclined and nearly horizontal coal seam, the distribution range of the drill holes on the inner side and the outer side of the air way is larger than 15m on the inner side and the outer side of the air way. In this embodiment, for inclined and steeply inclined coal seams, the distribution range of the drill holes on the side of the air way inclined upwards along the coal seam is greater than 20m away from the side of the air way, and the distribution range of the drill holes on the side of the air way inclined downwards along the coal seam is greater than 10m away from the side of the air way. The ranges of the distances are distances corresponding to the coal seam inclination direction, as shown in fig. 3, in this embodiment, the side of the wind tunnel facing upward along the coal seam inclination refers to the outer side of the wind tunnel, the side of the wind tunnel facing upward along the coal seam inclination refers to the inner side of the wind tunnel, as shown in fig. 2 and 3, L1 is the distribution range of the drill holes on the outer side of the wind tunnel, and L2 is the distribution range of the drill holes on the inner side of the wind tunnel.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (9)
1. The utility model provides a directional long drilling cut-through gas drainage system which characterized in that: the method comprises a plurality of groups of main drill holes arranged along the designed length direction of the air way and a plurality of branch drill holes arranged on the main drill holes, wherein the branch drill holes penetrate through the coal layer and extend to the designed position of the air way, and the corresponding branch drill holes on at least one main drill hole extend to the designed position of the air way.
2. The directional long borehole cross-layer gas extraction system according to claim 1, characterized in that: the main drilling holes are divided into two groups, namely an inner side main drilling hole located on the inner side of the designed position of the air way and an outer side main drilling hole located on the outer side of the designed position of the air way.
3. The directional long borehole cross-layer gas extraction system according to claim 2, characterized in that: the outer main bore opens into the immediate roof.
4. The directional long borehole cross-layer gas extraction system according to claim 2, characterized in that: the inner main drilling hole is formed in the old top.
5. The directional long borehole cross-layer gas extraction system according to claim 2, characterized in that: and branch drill holes extending to the designed position of the air way are formed in the main drill hole, close to the designed position of the air way, in the outer main drill hole.
6. The directional long borehole cross-layer gas extraction system according to claim 1, characterized in that: and two groups of branch drill holes are branched from the main drill hole and distributed on the inner side and the outer side of the main drill hole.
7. The directional long borehole cross-layer gas extraction system according to claim 5, characterized in that: the branch drill hole extending to the designed position of the air way is communicated with the upper position of the middle part of the designed section of the air way.
8. The directional long borehole cross-layer gas extraction system according to claim 2, characterized in that: for the slowly inclined and nearly horizontal coal seams, the distribution range of the drill holes on the inner side and the outer side of the air way is 15m larger than that on the inner side and the outer side of the air way.
9. The directional long borehole cross-layer gas extraction system according to claim 4, characterized in that: for inclined and steeply inclined coal seams, the distribution range of the drill holes on the side of the air way which inclines upwards along the coal seam is larger than the distance of 20m from the side of the air way, and the distribution range of the drill holes on the side of the air way which inclines downwards along the coal seam is larger than the distance of 10m from the side of the air way.
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| CN202021919707.XU CN213269850U (en) | 2020-09-06 | 2020-09-06 | Directional long-drill-hole cross-layer gas extraction system |
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| CN202021919707.XU CN213269850U (en) | 2020-09-06 | 2020-09-06 | Directional long-drill-hole cross-layer gas extraction system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044368A (en) * | 2023-04-03 | 2023-05-02 | 中国电建集团西北勘测设计研究院有限公司 | Curve directional drilling geological exploration drilling layout method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044368A (en) * | 2023-04-03 | 2023-05-02 | 中国电建集团西北勘测设计研究院有限公司 | Curve directional drilling geological exploration drilling layout method |
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