CN103742188A - Coal mine pump drainage gas well and drilling method thereof - Google Patents
Coal mine pump drainage gas well and drilling method thereof Download PDFInfo
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- CN103742188A CN103742188A CN201410007044.7A CN201410007044A CN103742188A CN 103742188 A CN103742188 A CN 103742188A CN 201410007044 A CN201410007044 A CN 201410007044A CN 103742188 A CN103742188 A CN 103742188A
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Abstract
The invention provides a coal mine pump drainage gas well and a drilling method thereof. The coal mine pump drainage gas well comprises a vertical well, a horizontal well communicated with the vertical well, and a horizontal multilateral well communicated with the horizontal well, wherein the horizontal multilateral well comprises a first horizontal multilateral well located in the upper area of a coal mine layer. The drilling method of the coal mine pump drainage gas well includes: drilling the vertical well; drilling the horizontal well which is communicated with the vertical well; drilling the horizontal multilateral well which is communicated with the horizontal well and comprises the first horizontal multilateral well located in the upper area of the coal mine layer. According to the coal mine pump drainage gas well and the drilling method thereof, the first horizontal multilateral well is disposed in the upper area of the coal mine layer, gas in the coal mine layer is basically concentrated in the upper area, and therefore the horizontal multilateral well arranged on the upper portion of the coal mine layer can pump out the gas in the coal mine layer thoroughly before a coal mine is dug, and furthermore times of repeatedly pumping out the gas during the digging process of the coal mine are reduced, and digging safety of the coal mine is improved.
Description
Technical field
The present invention relates to colliery technical field, especially, relate to a kind of colliery drawing-off gas well and drilling method.
Background technology
At present, the ground that coal mine gas pump drainage adopts is communicated with pump drainage method with down-hole be that surface orientation horizontal well creeps into and is communicated with straight well, and horizontal branch well is laid and is pinniform.But, due in early-stage preparations deficiency, the existing well construction for colliery drawing-off gas has many deficiencies, thereby cause occurring variety of issue in the process of drawing-off gas, wherein, comparatively serious problem is exactly before mine excavation, and pump drainage is out comparatively up hill and dale by lying in gas in colliery always cannot to utilize the drawing-off gas well that creeps into, still there is relatively large gas in the process at mine excavation, has increased the potential safety hazard of coal production.
Summary of the invention
The object of the invention is to provide a kind of colliery drawing-off gas well and drilling method, to solve the technical problem that existing colliery drawing-off gas well easily stops up, gas exhaust amount is limited.
For achieving the above object, according to an aspect of the present invention, provide a kind of colliery drawing-off gas well, having comprised: straight well; Horizontal well, is communicated with straight well; Horizontal branch well, is communicated with horizontal well, and horizontal branch well comprises the first horizontal branch well of the upper area that is positioned at colliery layer.
Further, the distance of the end face of the axis of the first horizontal branch well and colliery layer be colliery layer thickness 1/3rd.
Further, horizontal branch well also comprises the second horizontal branch well that is positioned at following coal mine gallery digging district.
Further, between straight well and following coal mine gallery digging district, by the second horizontal branch well, be indirectly communicated with.
Further, horizontal well is positioned at the bottom of colliery layer and extends along the direction vertical with the trend of colliery layer.
Further, horizontal branch well is along extending with the direction of the axially parallel of following coal mine gallery.
According to another aspect of the present invention, also provide the drilling method of a kind of colliery drawing-off gas well, having comprised: offer straight well; Offer the horizontal well being communicated with straight well; Offer the horizontal branch well being communicated with horizontal well, wherein, offer the horizontal branch well being communicated with horizontal well, comprising: the first horizontal branch well of offering the upper area that is positioned at colliery layer.
Further, the first horizontal branch well of offering the upper area that is positioned at colliery layer, comprising: using being the thickness of colliery layer with the distance of the end face of colliery layer, 1/3rd aspect is offered the first horizontal branch well as the plane at the axis place of the first horizontal branch well.
Further, offer the horizontal branch well being communicated with horizontal well, also comprise: in following coal mine gallery digging district, offer the second horizontal branch well.
Further, before offering straight well, also comprise: according to the rock in following coal mine gallery digging district, move angle and determine the position of offering of straight well, so that straight well keeps being communicated with horizontal well after ore bed of living in is moved.
Further, offer the horizontal well being communicated with straight well, comprising: the ore bed tendency of determining colliery to be dug; Horizontal well is offered along the direction vertical with the trend of ore bed in bottom at ore bed.
Further, along offering with the direction of the axially parallel of digging tunnel future the horizontal branch well being communicated with horizontal well.
The present invention has following beneficial effect:
The invention provides a kind of colliery drawing-off gas well and drilling method, wherein, colliery drawing-off gas well comprises: straight well; Horizontal well, is communicated with straight well; Horizontal branch well, is communicated with horizontal well, and horizontal branch well comprises the first horizontal branch well of the upper area that is positioned at colliery layer; Drilling method comprises: offer straight well; Offer the horizontal well being communicated with straight well; Offer the horizontal branch well being communicated with horizontal well, horizontal branch well comprises the first horizontal branch well of the upper area that is positioned at colliery layer.Drawing-off gas well provided by the invention and drilling method, the first horizontal branch well is set in the upper area of colliery layer, gas in the layer of colliery substantially all concentrates on upper area, so, top at colliery layer arranges horizontal branch well, can be more up hill and dale before mine excavation by gas exhaust out, be reduced in the process of mine excavation repeatedly drawing-off gas, the safety that has improved mine excavation.
Except object described above, feature and advantage, the present invention also has other object, feature and advantage.Below with reference to figure, the present invention is further detailed explanation.
Accompanying drawing explanation
The accompanying drawing that forms the application's a part is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used 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 colliery drawing-off gas well of the preferred embodiment of the present invention.
The specific embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated, but the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
One aspect of the present invention, provides the drilling method of a kind of colliery drawing-off gas well, and the method comprises: first, offer straight well; Then, offer the horizontal well B being communicated with this straight well; Finally, offer the horizontal branch well being communicated with horizontal well B, wherein, horizontal branch well comprises the first horizontal branch well E of the upper area that is positioned at colliery layer.Because the gas in colliery mainly concentrates on upper area, so the upper area in the layer of colliery is offered horizontal branch well, the most of gas exhaust in the layer of colliery can be gone out, pump drainage effect is comparatively thorough, and pump drainage efficiency is high., due to the restriction of offering position of horizontal well and horizontal branch well, easily there is the problem that obstruction, water seal and straight well can not reuse in existing drawing-off gas well.
In fact, the distance of the end face of the axis of the first horizontal branch well E and colliery layer be colliery layer thickness 1/3rd.That is to say, the first horizontal branch well E is arranged in the layer of colliery and apart from the distance of the end face of colliery layer, is in 1/3rd the aspect of thickness of colliery layer, the more effectively gas in the layer of pump drainage colliery.
In addition, horizontal branch well also comprises the second horizontal branch well D that is positioned at following coal mine gallery digging district F.Multilateral Wells is laid in following digging tunnel, is conducive to the gas in pre-pump drainage digging tunnel before mine excavation, reduce the gas stock in following digging tunnel, improve safety factor.
In fact, between straight well A and following coal mine gallery digging district F, by the second horizontal branch well D, be indirectly communicated with.In prior art, conventionally straight well is crept into following coal mine gallery and dig in district F, after following coal mine gallery digging district F is dug out, straight well A just forms with following coal mine gallery digging district F the relation being directly communicated with, and like this, straight well A has just formed a branch in mine excavation tunnel, along with the carrying out of mine excavation, due to the movement of ore bed, straight well A will be destroyed, cannot continue to use again.And in this application straight well A is designed to and the form of following coal mine gallery digging district F indirect communication, be not to be communicated with between straight well A and following coal mine gallery digging district F, can make straight well A in being independent of the state in mine excavation tunnel, avoid straight well A destroyed, make straight well A can also be used for the Multipurpose well of later stage tunnel pump drainage.Actual creep into straight well A in, as long as straight well A is crept between following coal mine gallery digging district F, there is a segment distance.
For fear of straight well A, be subject to impact that in the mining process of colliery, ore bed moves and destroyed, before offering straight well A, also comprise: according to the rock of following coal mine gallery digging district F, move angle and determine the position of offering of straight well A, so that straight well A keeps being communicated with horizontal well B after ore bed of living in is moved.Utilizing rock to move angle to determine the position of straight well A, avoid the ore bed being moved to destroy, is soluble to those skilled in the art.Problem is, the conventional way of this area is to utilize straight well A while only carrying out pre-drawing-off gas between digging coal mine gallery, and after mine excavation or again creep into again a bite straight well or utilize horizontal well B to realize the drawing-off gas in later stage.In the application, change existing conventional method, straight well A is designed to can both be used in mine excavation early stage and later stage to the well of drawing-off gas, improve the utilization rate of straight well A, avoid repeatedly drilling through the program of multiple straight wells, raising coal mine gas pump drainage method.
The above-mentioned process of offering the horizontal well B being communicated with described straight well A, comprising: first, determine the ore bed bearing of trend in colliery to be dug; Afterwards, in the bottom of ore bed, along the direction vertical with the trend of ore bed, offer horizontal well B.。Horizontal well B is arranged on to ore bed bottom, and horizontal branch well also forms the state under being tilted to, so can more be conducive to drawing-off gas and eliminate water blocking
According to another aspect of the present invention, also provide a kind of colliery drawing-off gas well, the forming process of this drawing-off gas well is crept into and is formed according to above-mentioned drilling method, and therefore, this drawing-off gas well comprises: straight well A; Horizontal well B, A is communicated with straight well; Horizontal branch well, B is communicated with horizontal well, and horizontal branch well comprises the first horizontal branch well E of the upper area that is positioned at colliery layer.And, the distance of the end face of the axis of the first horizontal branch well E and described colliery layer be described colliery layer thickness 1/3rd.Horizontal branch well also comprise be positioned at following coal mine gallery digging district F and with described the second horizontal branch well D.Between straight well A and following coal mine gallery digging district F, by described the second horizontal branch well D, be indirectly communicated with.The bearing of trend of horizontal well B is parallel with described ore bed bearing of trend.
For the ease of understanding, in conjunction with Fig. 1, drilling method provided by the invention is described.
The first, according to calculating, determine the distance of straight well A and following coal mine gallery digging F place, district aspect;
The second, at colliery layer, adopt large drill bit expanded hole, the cavity being communicated with straight well A as horizontal well B, and calculate shaft bottom coordinate;
The 3rd, according to ground condition, choose the well location of horizontal well B, adopt Technology of Directional Drilling and rotary steering technology that horizontal well B is communicated with straight well A;
The 4th, horizontal well B extends and creeps in ore bed tendency (perpendicular to the direction of seam strike, ore bed tendency is by tilting downwards, and horizontal well B is tilted to and creeps into) with reverse, arrives after predetermined length, draws back directed drilling tool and carries out horizontal branch well E and creep into;
The 5th, horizontal branch well B is at following coal mine gallery digging district F, parallel digging district horizontal drilling;
The 6th, under coal bed top, at layer thickness 1/3rd places, Ceng Neiyan colliery, colliery, carry out creeping into of horizontal branch well E.
Below, bright above-mentioned drilling method for instance:
The first, on ground, according to the rock of following coal mine gallery digging district F, move angle and determine the position of straight well A, bore and reach under coal seam more than 10m, as extraction sediment district;
The second, be lowered to measuring apparatus and carry out the well track parameter measurement of straight well A, calculate well coordinate;
The 3rd, in straight well A, be lowered to pillar;
The 4th, then be lowered to reaming bit that diameter is greater than 500mm in colliery layer reaming, the cavity being communicated with straight well A as horizontal well B;
The 5th, according to the requirement of ore bed situation and horizontal well B, determine horizontal well B;
The 6th, horizontal well B directional inclination is communicated with straight well A, the reverse ore bed tendency of horizontal segment of horizontal well B extends to design length (this design length needs according to colliery owner and the ability of ground drilling equipment is determined) and prepares afterwards to start horizontal branch well;
The 7th, first implement the second horizontal branch well D, the second horizontal branch well D is positioned at following coal mine gallery digging district F;
The 8th, then draw back drilling tool and implement the first horizontal branch well E in the layer of colliery, it is colliery layer thickness 1/3rd places that the first horizontal branch well E is positioned at Ceng Neiju colliery, colliery layer end face distance.
The 9th, the rest may be inferred, completes all horizontal branch wells always, thereby reach effective drawing-off gas.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. a colliery drawing-off gas well, is characterized in that, comprising:
Straight well (A);
Horizontal well (B), is communicated with described straight well (A);
Horizontal branch well, is communicated with described horizontal well (B), and described horizontal branch well comprises first horizontal branch well (E) of the upper area that is positioned at colliery layer.
2. colliery according to claim 1 drawing-off gas well, is characterized in that,
The distance of the end face of the axis of described the first horizontal branch well (E) and described colliery layer be described colliery layer thickness 1/3rd.
3. colliery according to claim 2 drawing-off gas well, is characterized in that,
Described horizontal branch well also comprises the second horizontal branch well (D) that is positioned at following coal mine gallery digging district (F).
4. colliery according to claim 3 drawing-off gas well, is characterized in that,
Between described straight well (A) and following coal mine gallery digging district (F), by described the second horizontal branch well (D), be indirectly communicated with.
5. colliery according to claim 1 drawing-off gas well, is characterized in that,
Described horizontal well (B) is positioned at the bottom of described colliery layer and extends along the direction vertical with the trend of described colliery layer.
6. according to the colliery drawing-off gas well described in any one in claim 1 to 5, it is characterized in that,
Described horizontal branch well is along extending with the direction of the axially parallel of following coal mine gallery.
7. a drilling method for colliery drawing-off gas well, is characterized in that, comprising:
Offer straight well (A);
Offer the horizontal well (B) being communicated with described straight well (A);
Offer the horizontal branch well being communicated with described horizontal well (B),
Wherein,
The described horizontal branch well being communicated with described horizontal well (B) of offering, comprising: the first horizontal branch well (E) of offering the upper area that is positioned at colliery layer.
8. boring method according to claim 7, is characterized in that, described in offer first horizontal branch well (E) of the upper area that is positioned at colliery layer, comprising:
Using being the thickness of described colliery layer with the distance of the end face of described colliery layer, 1/3rd aspect is offered described the first horizontal branch well (E) as the plane at the axis place of described the first horizontal branch well (E).
9. boring method according to claim 8, is characterized in that, described in offer the horizontal branch well being communicated with described horizontal well (B), also comprise:
In following coal mine gallery digging district (F), offer the second horizontal branch well (D).
10. boring method according to claim 7, is characterized in that, described in offer straight well (A) before, also comprise:
According to the rock in following coal mine gallery digging district (F), move angle and determine the position of offering of described straight well (A), so that described straight well (A) keeps being communicated with described horizontal well (B) after ore bed of living in is moved.
11. boring methods according to claim 7, is characterized in that, described in offer the horizontal well (B) being communicated with described straight well (A), comprising:
Determine the ore bed tendency in colliery to be dug;
Described horizontal well (B) is offered along the direction vertical with the trend of described colliery layer in bottom at colliery layer.
12. boring methods according to claim 7, is characterized in that,
Along offering with the direction of the axially parallel of digging tunnel future the horizontal branch well being communicated with described horizontal well (B).
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| CN201410007044.7A CN103742188B (en) | 2014-01-07 | 2014-01-07 | Colliery drawing-off gas well and boring method |
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| CN201410007044.7A CN103742188B (en) | 2014-01-07 | 2014-01-07 | Colliery drawing-off gas well and boring method |
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Cited By (7)
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| CN104963714A (en) * | 2015-04-30 | 2015-10-07 | 山西蓝焰煤层气集团有限责任公司 | Standing air shaft safe coal-uncovering technology of high gassy mine |
| CN104989366A (en) * | 2015-08-03 | 2015-10-21 | 中国神华能源股份有限公司 | Coal mine well and construction method thereof |
| CN108798625A (en) * | 2018-05-31 | 2018-11-13 | 中国神华能源股份有限公司 | Mine and mining construction method |
| CN109403926A (en) * | 2018-10-31 | 2019-03-01 | 中国神华能源股份有限公司 | Implement the method for the coal bed gas of underground mining multilayer coal in a main entry |
| CN109441525A (en) * | 2018-11-12 | 2019-03-08 | 中国神华能源股份有限公司 | The method of pump drainage coal bed gas |
| CN110306934A (en) * | 2019-07-02 | 2019-10-08 | 中煤科工集团西安研究院有限公司 | The construction method and supporting drilling tool of double branch's top plate major diameter high position directional long boreholes |
| RU2749707C1 (en) * | 2020-12-14 | 2021-06-16 | федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет» | Method for degassing of overworked adjacent seams |
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| CN109403926A (en) * | 2018-10-31 | 2019-03-01 | 中国神华能源股份有限公司 | Implement the method for the coal bed gas of underground mining multilayer coal in a main entry |
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| CN110306934B (en) * | 2019-07-02 | 2021-03-19 | 中煤科工集团西安研究院有限公司 | Construction method for large-diameter high-position directional long drill hole of double-branch top plate |
| RU2749707C1 (en) * | 2020-12-14 | 2021-06-16 | федеральное государственное бюджетное образовательное учреждение высшего образования «Санкт-Петербургский горный университет» | Method for degassing of overworked adjacent seams |
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