CN108252715A - A kind of hard coal seam top plate spatio-temporal synergy controls method for weakening - Google Patents

A kind of hard coal seam top plate spatio-temporal synergy controls method for weakening Download PDF

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Publication number
CN108252715A
CN108252715A CN201810033695.1A CN201810033695A CN108252715A CN 108252715 A CN108252715 A CN 108252715A CN 201810033695 A CN201810033695 A CN 201810033695A CN 108252715 A CN108252715 A CN 108252715A
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fracturing
row
drilling
coal seam
powder stick
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CN201810033695.1A
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CN108252715B (en
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翟成
徐吉钊
孙勇
郭继胜
马征
马会腾
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China University of Mining and Technology CUMT
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China University of Mining and Technology CUMT
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C41/00Methods of underground or surface mining; Layouts therefor
    • E21C41/16Methods of underground mining; Layouts therefor
    • E21C41/18Methods of underground mining; Layouts therefor for brown or hard coal
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21CMINING OR QUARRYING
    • E21C37/00Other methods or devices for dislodging with or without loading
    • E21C37/06Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
    • E21C37/14Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by compressed air; by gas blast; by gasifying liquids

Abstract

The invention discloses a kind of hard coal seam top plate spatio-temporal synergies to control method for weakening, and this method includes:First several advanced reduction fracturing drilling groups are drilled through in return aircourse top plate upper edge working face of coal seam direction of propulsion sequence, the drilling of first row fracturing, the drilling of second row fracturing and third row's fracturing drilling, the drilling of three row's fracturings for including being sequentially arranged along working face of coal seam direction of propulsion in wherein each advanced reduction fracturing drilling group tilt different angle towards goaf direction;It when working face of coal seam is advanced into advanced reduction fracturing drilling group position, drills to three row's fracturings load static breaking agent powder stick successively, realize the reduction of fracturing step by step of roof strata.This method manufactures free face or reduction layer to give full play to the optimum efficiency of powder stick by using the scope of freedom, accomplishes " reduction+entirety fracture step by step ", realizes the spatio-temporal synergy fracturing of top plate differing tilt angles drilling, improve roof caving efficiency.This method is easy to operate, and fracturing effect is preferable.

Description

A kind of hard coal seam top plate spatio-temporal synergy controls method for weakening
Technical field
The present invention relates to a kind of hard coal seam top plate spatio-temporal synergies to control method for weakening, is particularly suitable for no free space Tight roof rock stratum efficient fracturing operation in, realize spatio-temporal synergy control reduction purpose.
Background technology
It is to prevent gas at upper corner abnormal accumulation, reduce effectively arranging for overburden stress burst concentration that tight roof, which is caving, One of apply, and the features such as the globality and high intensity of hard and compact roof strata often for coal seam back production when the quick caving zone of top plate come Many obstructions.Conventional top plate fracturing measure mainly includes high-pressure hydraulic pressure break and deep hole blasting technology, is using high pressure Water or emulsion carry out fracturing to roof strata, but still remain some shortcomings, for example, high-pressure hydraulic fracturing technique needs High pressure water to be relied on as medium, this requires borehole sealing and fracturing unit high, and operating process is complex, cost compared with Greatly;Deep hole blasting technology is then to be difficult to ensure that all emulsions are effectively ignited, and shock wave caused by explosion holds very much Easily reservoir stress is caused to disturb, these limitations limit the safety of seam mining.
Static Blasting Technique meets the lasting highly expanded of water reaction generation by powder stick using static breaking agent powder stick as medium Stress, so as to achieve the purpose that weaken fracturing roof strata.Normal method is that a large amount of vertical drillings drilled through are carried out with alternately dress Medicine, one side drilling construction amount is larger, and premise cost is larger;On the other hand alternately the mode of powder charge is easy to cause useless hole, and It is difficult that effective discharge space is provided, causes reduction fracturing effect poor.In view of the above problems, it needs broken according to static state The stress characteristics of broken dose of powder stick create the effective scope of freedom, increase apparent relief area and space, on the one hand can fully send out The lasting high stress of static breaking agent powder stick is waved, on the other hand a large amount of bore operation amount can be also saved, finally realize hard top The whole controllable reduction of slate layer.
Invention content
Goal of the invention:The invention aims to overcome the shortcoming in prior art, provide it is a kind of it is easy to operate, apply Work is convenient, and the spatio-temporal synergy for being truly realized tight roof rock stratum controllably weakens fracturing method.
To achieve these goals, present invention employs following technical solutions:A kind of hard coal seam top plate spatio-temporal synergy Control method for weakening, which is characterized in that this method includes the following steps:
Advance borehole:In return aircourse, top plate upper edge working face of coal seam direction of propulsion sequence drills through several advanced reductions and causes Drilling group is split, advanced reduction fracturing drills through directly top and reaches old top, and each advanced fracturing drilling group that weakens is included along coal The drilling of first row fracturing, the drilling of second row fracturing and the third row's fracturing drilling that layer advance of the face direction is sequentially arranged, first It arranges fracturing drilling, the drilling of second row fracturing and third row's fracturing drilling to tilt towards goaf direction, the drilling of first row fracturing is inclined Rake angle is α, and second row fracturing bore inclining angle is β, and third row's fracturing bore inclining angle is γ, α<β<γ;
Fracturing is weakened step by step:When working face of coal seam is pushed ahead to the position of advanced reduction fracturing drilling group, successively to Static breaking agent powder stick is loaded in the drilling of first row fracturing, the drilling of second row fracturing and third row's fracturing drilling, in static crushing Under the effect of agent powder stick, the reduction of fracturing step by step of rock stratum around advanced reduction fracturing drilling group is realized, and then realize return aircourse top The fracture of plate is across falling.
Further, in advance borehole step, the spacing between two neighboring advanced reduction fracturing drilling group is 1~1.2m; Spacing between the drilling of first row fracturing, the drilling of second row fracturing and third row's fracturing drilling is 1~1.2m;First row fracturing is bored It is 2~3m, pitch of holes 0.5 that the aperture in hole, the drilling of second row fracturing and third row's fracturing drilling, which is 40~60mm, hole depth, ~0.8m.
Further, in advance borehole step, α is 30 °, and β is 45 °, and γ is 60 °.
Further, it weakens in fracturing step step by step, when loading static breaking agent powder stick, first loads first row fracturing and bore Hole waits the static breaking agent powder stick reaction time in the drilling of first rows fracturing to reach t1When refill the drilling of second row fracturing, wait the The static breaking agent powder stick reaction time reaches t in the drilling of two row's fracturings1When refill third row fracturing drilling, t1Less than in drilling Required time when static breaking agent powder stick swelling stress value is to peaking, wherein, for spring and autumn type static breaking agent Powder stick, t1Ranging from 1~1.2h, for summer type static breaking agent powder stick, t1Ranging from 2~2.5h breaks winter type static state Broken dose of powder stick, t1Ranging from 0.3~0.5h.
Advantageous effect:It is super that the present invention drills through several in the return aircourse top plate upper edge wind direction sequence of working face first Preceding reduction fracturing drilling group, each advanced reduction fracturing drilling group include boring along three row's fracturings that wind direction is sequentially arranged Hole, and the drilling of three row's fracturings is tilted towards goaf direction, when working face is pushed ahead to surmounting advanced reduction fracturing drilling During the position of group, according to the powder stick reaction time, drill to three row's fracturings be packed into powder stick successively, static breaking agent can be played in this way The optimum performance of powder stick is finally reached the effect of air way top plate " reduction+entirety fracturing step by step ";When on the other hand, according to setting Sequence loads static breaking agent powder stick into the drilling of first row fracturing, the drilling of second row fracturing and third row's fracturing drilling successively, this Sample realizes the Stress superposition between adjacent two row hole drilling, so as to cooling phase occur to avoid swelling stress in two row hole drillings;The party Method can fully increase drilling utilization rate, and by the powder charge timing and spatiality of drilling, it is weak to be truly realized spatio-temporal synergy control Change;This method is simple, easy to operate, has wide applicability.
Description of the drawings
Fig. 1 is the arrangement schematic diagram of the advanced reduction fracturing drilling group of the present invention;
Fig. 2 is the drilling schematic diagram of the advanced reduction fracturing drilling group of the present invention;
Fig. 3 is the angle of inclination of the drilling of first row fracturing, the drilling of second row fracturing and the third row's fracturing drilling of the present invention Schematic diagram;
Fig. 4 is the filling schematic diagram of the static breaking agent powder stick of the present invention (by taking third row's fracturing drilling as an example);
Fig. 5 is the swelling stress curve graph of static breaking agent powder stick.
In figure:1- return aircourses;2- is directly pushed up;3- is pushed up always;4- first rows fracturing drills;5- second rows fracturing drills;6- Third row's fracturing drilling;7- static breaking agent powder sticks;8- working face of coal seam;9- goafs;10- weakens fracturing drilling group in advance.
Specific embodiment:
Further explanation is done to the present invention below in conjunction with the accompanying drawings.
As shown in Figures 1 to 4, a kind of hard coal seam top plate spatio-temporal synergy of the invention control method for weakening, this method are applicable in Tight roof reduction fracturing work when in goaf 9 without the scope of freedom, it is intended to which advance fracturing destroys rock stratum globality to create more Mostly effective free space, this method include the following steps:
Advance borehole:In return aircourse, 1 top plate upper edge working face of coal seam, 8 direction of propulsion sequence drills through several advanced reductions Fracturing drilling group 10, advanced reduction fracturing drilling 10 pass through directly top 2 to reach top 3 always, each advanced reduction fracturing drilling group 10 The first row fracturing drilling 4, second row fracturing drilling 5 and third for including being sequentially arranged along 8 direction of propulsion of working face of coal seam are arranged Fracturing drilling 6, first row fracturing drilling 4, second row fracturing drilling 5 and third row's fracturing drilling 6 are inclined towards 9 direction of goaf Tiltedly, first row fracturing drills 4 angles of inclination as α, and second row fracturing drills 5 angles of inclination as β, 6 inclination of third row's fracturing drilling Angle is γ, α<β<γ, in the present embodiment, the spacing between two neighboring advanced reduction fracturing drilling group is 1~1.2m, first row Spacing between fracturing drilling, the drilling of second row fracturing and third row's fracturing drilling is 1~1.2m, the drilling of first row fracturing, second It is 2~3m, pitch of holes is 0.5~0.8m that the aperture of the drilling of row's fracturing and third row's fracturing drilling, which is 40~60mm, hole depth,;
Fracturing is weakened step by step:When working face of coal seam 8 is pushed ahead to the position of advanced reduction fracturing drilling group 10, successively Static breaking agent powder stick 7 is loaded into first row fracturing drilling 4, second row fracturing drilling 5 and third row's fracturing drilling 6, is being filled out When filling static breaking agent powder stick, first row fracturing drilling 4 is first loaded, waits static breaking agent powder stick 7 in first rows fracturing drilling 4 anti- Reach t between seasonable1When refill second row fracturing drilling 5, when second rows fracturing drilling 5 in static breaking agent powder stick 7 react when Between reach t1When refill third row fracturing drilling 6, t1Less than static breaking agent powder stick swelling stress value in drilling to peaking institute It takes time, wherein, for spring and autumn type static breaking agent powder stick, t1Ranging from 1~1.2h, for summer type static crushing Agent powder stick, t1Ranging from 2~2.5h, for winter type static breaking agent powder stick, t1Ranging from 0.3~0.5h.In static breaking agent Under powder stick 7 acts on, the reduction of fracturing step by step of advanced 10 surrounding rock stratum of reduction fracturing drilling group is realized, specifically, first row fracturing The 4 surrounding rock stratum that drill crack and form first of zone of fracture using 1 top plate of return aircourse as the scope of freedom, Ran Hou first Two row's fracturings drilling, 5 surrounding rock stratum crack and form the second zone of fracture using first of zone of fracture as the scope of freedom, the One of zone of fracture provides certain release direction for the fracturing of 5 surrounding rock stratum of second row fracturing drilling, and last third row fracturing is bored 6 surrounding rock stratum of hole cracks and forms the second zone of fracture using second zone of fracture as the scope of freedom, second fracture The fracturing that layer arranges 6 surrounding rock stratum of fracturing drilling for third provides certain release direction, and then realizes the disconnected of 1 top plate of return aircourse Split the effect for across falling, being finally reached return aircourse top plate " reduction+entirety fracturing step by step ".
As shown in figure 3, first row fracturing drills, the fracture criterion of 4 surrounding rock stratum is σ sin α v Σ miG > τ, second row cause The fracture criterion for splitting drilling surrounding rock stratum is σ sin β+Σ mjG > τ, the fracture criterion of 6 surrounding rock stratum of third row's fracturing drilling is σ sinγ+ΣmkG > τ.Wherein, Σ miThe quality of 4 surrounding rock stratum of first row fracturing drilling respectively, Σ mjIt drills for second row fracturing 5, Σ mkThe quality of fracturing 6 surrounding roof stratas of drilling is arranged for third;τ is the tensile strength of roof strata.σ is static breaking agent Powder stick 7 reacts generated swelling stress with the sum of thermal stress, is a variable.Expansion if Fig. 5 is static breaking agent powder stick should Force curve figure.In t1At the moment, the swelling stress of static breaking agent powder stick is in ascent stage, in t2Moment, static breaking agent powder stick Swelling stress be in lower liter of stage, t1And t2Between period be in static breaking agent powder stick optimum response action time section. The present invention is filled out according to setting sequential into first row fracturing drilling 4, second row fracturing drilling 5 and third row's fracturing drilling 6 successively Static breaking agent powder stick 7 is filled, first loads first row fracturing drilling 4, waits static breaking agent powder stick 7 in first rows fracturing drilling 4 anti- Reach t between seasonable1When refill second row fracturing drilling 5, when second rows fracturing drilling 5 in static breaking agent powder stick 7 react when Between reach t1When refill third row fracturing drilling 6, can realize the Stress superposition between adjacent two row hole drilling in this way, so as to Swelling stress in two row hole drillings is avoided cooling phase occur.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should It is considered as protection scope of the present invention.

Claims (4)

1. a kind of hard coal seam top plate spatio-temporal synergy controls method for weakening, which is characterized in that this method includes the following steps:
Advance borehole:Several advanced reductions are drilled through in return aircourse (1) top plate upper edge working face of coal seam (8) direction of propulsion sequence Fracturing drilling group (10), advanced reduction fracturing drill through directly top (2) and reach old top (3), each advanced reduction fracturing drilling Group (10) includes the first row fracturing drilling (4) being sequentially arranged along working face of coal seam (8) direction of propulsion, second row fracturing drills (5) and third row's fracturing drilling (6), first row fracturing drilling (4), second row fracturing drilling (5) and third arrange fracturing drilling (6) It is tilted towards goaf (9) direction, first row fracturing drills (4) angle of inclination as α, second row fracturing drilling (5) angle of inclination For β, third row's fracturing drilling (6) angle of inclination is γ, α<β<γ;
Fracturing is weakened step by step:When working face of coal seam (8) is pushed ahead to the position of advanced reduction fracturing drilling group (10), successively Static breaking agent powder stick is loaded into first row fracturing drilling (4), second row fracturing drilling (5) and third row's fracturing drilling (6) (7), under static breaking agent powder stick (7) effect, realize that the fracturing step by step of advanced reduction fracturing drilling group (10) surrounding rock stratum is weak Change, and then realize the fracture of return aircourse (1) top plate across falling.
2. a kind of hard coal seam top plate spatio-temporal synergy control method for weakening according to claim 1, it is characterised in that:In advance In drill process, the spacing between two neighboring advanced reduction fracturing drilling group (10) is 1~1.2m;First row fracturing drilling (4), The spacing that second row fracturing drills (5) between third row's fracturing drilling (6) is 1~1.2m;First row fracturing drilling (4), second The drill aperture of (6) of row's fracturing drilling (5) and third row's fracturing be 40~60mm, hole depth is 2~3m, pitch of holes 0.5 ~0.8m.
3. a kind of hard coal seam top plate spatio-temporal synergy control method for weakening according to claim 1, it is characterised in that:In advance In drill process, α is 30 °, and β is 45 °, and γ is 60 °.
4. a kind of hard coal seam top plate spatio-temporal synergy control method for weakening according to claim 1, it is characterised in that:Step by step It weakens in fracturing step, when loading static breaking agent powder stick (7), first loads first row fracturing drilling (4), first rows fracturing is waited to bore Hole (4) interior static breaking agent powder stick (7) reaction time reaches t1When refill second row fracturing drilling (5), wait second rows fracturing Drilling (5) interior static breaking agent powder stick (7) reaction time reaches t1When refill third row fracturing drilling (6), t1Less than in drilling Required time when static breaking agent powder stick swelling stress value is to peaking, wherein, for spring and autumn type static breaking agent Powder stick, t1Ranging from 1~1.2h, for summer type static breaking agent powder stick, t1Ranging from 2~2.5h breaks winter type static state Broken dose of powder stick, t1Ranging from 0.3~0.5h.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101705821A (en) * 2009-10-29 2010-05-12 太原理工大学 Method for controlling roof caving under condition of hardroof in coal mining
CN101876520A (en) * 2009-04-29 2010-11-03 宝钢集团新疆八一钢铁有限公司 Segment pre-blasting technology for steeply dipping hard coal seam roof
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal
CN107387085A (en) * 2017-09-26 2017-11-24 河南理工大学 A kind of tight roof and the porous controlled blasting softening method in coal seam
CN107503747A (en) * 2017-10-10 2017-12-22 中国平煤神马能源化工集团有限责任公司 A kind of static blasting economic benefits and social benefits fracturing weakens top plate method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101876520A (en) * 2009-04-29 2010-11-03 宝钢集团新疆八一钢铁有限公司 Segment pre-blasting technology for steeply dipping hard coal seam roof
CN101705821A (en) * 2009-10-29 2010-05-12 太原理工大学 Method for controlling roof caving under condition of hardroof in coal mining
CN103527198A (en) * 2013-10-21 2014-01-22 中国矿业大学 Hydraulic fracturing control method of cut tight roof/top coal
CN107387085A (en) * 2017-09-26 2017-11-24 河南理工大学 A kind of tight roof and the porous controlled blasting softening method in coal seam
CN107503747A (en) * 2017-10-10 2017-12-22 中国平煤神马能源化工集团有限责任公司 A kind of static blasting economic benefits and social benefits fracturing weakens top plate method

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