CN105221182B - Coal uncovering method under the complex geological condition of pole - Google Patents

Coal uncovering method under the complex geological condition of pole Download PDF

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Publication number
CN105221182B
CN105221182B CN201510601976.9A CN201510601976A CN105221182B CN 105221182 B CN105221182 B CN 105221182B CN 201510601976 A CN201510601976 A CN 201510601976A CN 105221182 B CN105221182 B CN 105221182B
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coal
hole
ascending pipe
punching
black
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CN105221182A (en
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刘晓
蔺海晓
王良金
马耕
敬复兴
李锋
张鹏伟
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Henan University of Technology
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Henan University of Technology
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F7/00Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B33/00Sealing or packing boreholes or wells
    • E21B33/10Sealing or packing boreholes or wells in the borehole
    • E21B33/13Methods or devices for cementing, for plugging holes, crevices, or the like

Abstract

Coal uncovering method under the complex geological condition of pole, comprises the following steps:(1)Situation analysis is carried out to geology:Judge whether the geology belongs to extremely complex coal bed, extremely complex coal bed is then divided into I, II, III 3 class hierarchies, and corresponding design mistake;(2)Punching standard is designed:I class hierarchy, II class hierarchy and III class hierarchy design punching volume of producing coal account for 2%, 3% and the 4% of master control volume respectively;(3)Budgetary estimate hydraulic flushing in hole parameter;(4)Stone door punching coal operation is carried out to coal seam under the complex geological condition of pole;The present invention solves stone door punching coal cycle length under the insurmountable pole Complicated Geologic Condition of prior art by implementing the measures such as drilling, hydraulic flushing in hole, hole filling to crossdrift, the problems such as dangerous high exposed coal difficulty, it is unbalance to avoid methane accumulation, stress of coal seam in punching hole, Gas Disaster probability of happening greatly reduces, realizes technical feasibility, safe and reliable, fast and effectively exposed coal.

Description

Coal uncovering method under the complex geological condition of pole
Technical field
The present invention relates to coal uncovering method under a kind of coal uncovering method, more particularly to a kind of pole complex geological condition.
Background technology
In all kinds of prominent accidents occurred in national colliery, the average intensity of outburst that stone door punching coal working face is occurred is most Greatly, up to 316t/ times;In the protrusion tonnage that China occurs reaches the super-huge prominent accident of more than kiloton, stone door punching coal work Make the protrusion ratio that face is occurred and be up to 77%.Because stone door punching coal intensity of outburst is big, it is wide to involve scope, caused by destroy it is tight Weight, can bring destructive disaster to mine, and stone door punching coal has become the difficult point and digging portion during Safety of Coal Mine Production The bottleneck engineering of administration.
Stone door punching coal engineering in China's is primarily present two hang-ups at present:One is that traditional exposed coal technology lays particular emphasis on security standpoint And the problem of exposed coal speed is slow, and the exposed coal time is long be present;Another is that prophylactico-therapeutic measures is not in place and cause security insufficient.Due to Exposed coal process is complicated, and the time length that exposed coal process needs, the average exposed coal time reaches 110~257 days.Stone door punching coal side at present Method is all based on crustal stress, gas pressure and coal petrography intensity comprehensive function protrusion mechanism and set out, and proposes many stone door punching coal protrusion-dispellings Method mainly has the measures such as hydraulic flushing in hole, standing and hydraulic slotted liner technique in terms of coal seam pressure relief and permeability improvement, in terms of coal body reinforcing Mainly there are the measures such as metallic framework and grouting and reinforcing, these measures achieve certain effect in outburst prevention work, but there is also very Big limitation.The measures such as hydraulic slotted liner technique can effectively removal crustal stress and gas pressure, but destroy coal body integrality, coal simultaneously Rock bulk strength is reduced, or even larger hole is formed in coal seam, is formed " gas pocket ", is formed potential gas explosion source, because This, there is an urgent need to a kind of technical feasibility, safe and reliable, fast and effectively exposed coal technology, can improve exposed coal speed, reduction measure Quantities, shorten the duration, and can is cost-effective, alleviates the pressure of input for safety.
The content of the invention
The present invention is in order to solve weak point of the prior art, there is provided a kind of technical feasibility, safe and reliable, fast and effective Pole complex geological condition under coal uncovering method.
In order to solve the above technical problems, the present invention adopts the following technical scheme that:Stone door punching coal side under the complex geological condition of pole Method, comprise the following steps:
(1)Situation analysis is carried out to geology:Judge whether the geology belongs to extremely complex coal bed, then draw extremely complex coal bed It is divided into I, II, III 3 class hierarchies, and corresponding design mistake;
(2)Punching standard is designed:I class hierarchy, II class hierarchy and III class hierarchy design punching volume of producing coal account for always respectively Control 2%, 3% and the 4% of volume;
(3)Budgetary estimate hydraulic flushing in hole parameter;
(4)Stone door punching coal operation is carried out to coal seam under the complex geological condition of pole.
The step(4)Comprise the following steps that:
A underground coal mine bottom plate extraction lane construct layer-through drilling, carry out hydraulic flushing in hole operation, and record drilling depth, Coal seam thickness and rush coal output;
B carries out inspecting hole operation using hole sealing tube to drilling, finds there is collapse hole position during inspecting hole operation, using rig by collapse hole The penetrating suitable hole in position;
C is designed according to drilling depth and coal seam thickness and is installed the length of device for filling, upper air-vent position, lower steam vent Position and filling feed position;
The device for filling of advance mounted mixed stirring device and black material ascending pipe and white material ascending pipe is installed to by d Drill setting position;
After e installations, check whether filling line and Double-liquid mud-injection pump are intact;
F carries out sealing of hole using cement injection to drilling;
The dosage that g expects according to the solid Te Jiehei material of coal weighing and solid Te Jiebai is gone out, will be solid special prompt using Double-liquid mud-injection pump Black material and solid Te Jiebai expect the hole of the injection hole after black material ascending pipe and white material ascending pipe enter mixed stirring device respectively In;
After the completion of h material feedings, black material ascending pipe and white material ascending pipe are pulled down, cleans Double-liquid mud-injection pump with clear water, black material injects Pipe and white material ascending pipe;
I repeat steps(2)The construction of next drilling is carried out to step h, and extraction borehole of being constructed around drilling, by extraction Drilling and sealing simultaneously carries out connection and takes out operation.
The division of described geologic assessment grade is as shown in Table 1:
Described construction complex exponent, wherein:KInclineFor seam inclination complex exponent,,For coal seam minimum angle-of-incidence and inclination maximum;KPleatFor fold Complexity coefficient,For the length of certain contour in crossdrift region Degree,For both ends distance of the contour in the section, n is the contour number of statistics;KIt is disconnectedFor tomography complexity coefficient,, fault throw, L is tomography development length, and S is statistics area.
Budgetary estimate hydraulic flushing in hole number includes prediction single hole and produced coal volume V1With calculate total punching number M,, H is that average coal is thick in formula, and b is punching hole spheroid semi-minor axis, and punching hole is shaped as spheroid, I, II, III class coal point 3d, 3.5d, 4d are not taken, and d is bore diameter;, V is control coal cumulative volume;A is that punching is produced coal standard, a value 2%, 3%, 4% is taken respectively in I, II, III class coal.
Action includes hole sealing tube, black material ascending pipe, expects ascending pipe, mixed stirring device and Double-liquid mud-injection pump, black material in vain Ascending pipe, white material ascending pipe and mixed stirring device are each provided inside hole sealing tube, two discharging openings of Double-liquid mud-injection pump respectively with Black material ascending pipe connect with the charging aperture of white material ascending pipe, black material ascending pipe and expect in vain the discharging opening of ascending pipe with mixing The charging aperture connection of device, hole sealing tube top are respectively equipped with upper air-vent, filling material hole and lower exhaust successively from top to bottom Hole.
Calculate solid Te Jiehei material and solid Te Jiebai material dosages are calculated using formula below:, V in formulaMaterialExpect for solid Te Jiehei and solid Te Jiebai expects dosage sum, MCoalFor hydraulic flushing in hole coal output,For the apparent density of coal, K is The coefficient of expansion after grout material reaction, K values 20.
Mixed stirring device includes three-way pipe and agitator, two branched pipes of three-way pipe connect respectively black material ascending pipe and White material ascending pipe, agitator are located at the main pipe of three-way pipe, and agitator is by agitating shaft and the helical blade being located on agitating shaft Composition, the supervisor of three-way pipe are extend into punching hole by filling material hole.
Above-mentioned technical proposal is used, the invention has the advantages that:By to crossdrift implement drilling, hydraulic flushing in hole, The measures such as hole filling solve stone door punching coal cycle length under the insurmountable pole Complicated Geologic Condition of prior art, dangerous high The problems such as exposed coal difficulty, avoid in punching hole that methane accumulation, stress of coal seam are unbalance, Gas Disaster greatly reduces Probability, realize technical feasibility, safe and reliable, fast and effectively exposed coal.In addition, black material ascending pipe and white material ascending pipe are forbidden to mix Close and use, prevent the blocking pipeline that reacted in pipe.
In summary, simple in construction, the easy to operate, technical feasibility of the present invention, safe and reliable and fast and effective.
Brief description of the drawings
Fig. 1 is the structural representation that the present invention constructs;
Fig. 2 is the enlarged drawing of device for filling in Fig. 1;
Fig. 3 is mixed stirring device schematic diagram in applying 2;
Reference is respectively in figure:1 is drilling;2 be hole sealing tube;3 be upper air-vent;4 be lower steam vent;5 be filling Material hole;6 be punching hole;7 be white material ascending pipe;8 be black material ascending pipe;9 be cement injection sealing of hole sections;10 be Grouting Pipe; 11 be Double-liquid mud-injection pump;12 be solid special prompt sealing of hole sections;13 be mixed stirring device;14 be three-way pipe;15 be agitator;16 be to take out Adopt screen casing;17 be extraction borehole;18 be drainage tube;19 be bottom plate extraction lane;20 be to have dug crossdrift tunnel;21 be not dig crossdrift lane Road;22 be coal seam;23 be solid special prompt obturation;24 be device for filling.
Embodiment
Coal uncovering method under the complex geological condition of pole is further described shown in 1 ~ 3 below in conjunction with the accompanying drawings, this reality The buried depth 700m of coal seam 22 in example, crossdrift tunnel 20 is dug and has tunneled at 220 five meters of coal seam, survey data shows this There are fold, and abundant little faults in place, and construction complex exponent K=0.13, the thickness variation coefficient of coal seam 22 is 73%, belongs to extremely unstable Coal seam, gas bearing capacity are in 13.94~27.18 m3Between/t, gas pressure is 1.35 MPa, belongs to coal and gas prominent danger Danger zone, to realize rapid uncovering coal, the present invention uses following steps:
(1)Situation analysis is carried out to geology, determines to be that II class is extremely complicated at this with gas bearing situation according to exploration result Coal seam, design punching, which is produced coal, accounts for the 3% of control coal cumulative volume, about 40.5m3, drill 1 a diameter of 0.1m;
(2)A layer punching drilling 1 is worn in construction upwards in crossdrift tunnel 21 of not digging in bottom plate extraction lane 19, carries out hydraulic flushing in hole Operation, form punching hole 6 and record drilling 1 length 25m, coal segment length 3.2m and rush coal output 5t;Punching hole 6 is ellipse Spheroid form, the semi-minor axis b of punching hole 6 are 0.35m, and single hole prediction coal output is 1.5m3, calculate 1 number m of hydraulic flushing in hole drilling =26;
(3)Inspecting hole operation is carried out to drilling 1 using hole sealing tube 2, finds there is collapse hole position during inspecting hole operation, utilizes rig will The penetrating suitable hole in collapse hole position;
(4)Device for filling 24 is designed according to the thickness in the depth of drilling 1 and coal seam 22, and according to design in device for filling 24 In the top of hole sealing tube 2 open up upper air-vent 3, filling material hole 5 and lower steam vent 4 successively from top to bottom;Device for filling 24 wraps Include hole sealing tube 2, black material ascending pipe 8, white material ascending pipe 7, mixed stirring device 13 and Double-liquid mud-injection pump 11, it is black material ascending pipe 8, white Material ascending pipe 7 and mixed stirring device 13 are each provided inside hole sealing tube 2, two discharging openings of Double-liquid mud-injection pump 11 respectively with black material Ascending pipe 8 connect with the charging aperture of white material ascending pipe 7, black material ascending pipe 8 and expect in vain the discharging opening of ascending pipe 7 with mixing The charging aperture connection of device 13;
(5)Agitator 15 is installed in mixed stirring device 13, and will expect that ascending pipe 7 and black material ascending pipe 8 connect in vain Onto mixed stirring device 13, then the supervisor of the three-way pipe 14 of mixed stirring device 13 is located at filling material hole 5, utilized Mixed stirring device 13 is installed to setting position by hole sealing tube 2;Mixed stirring device 13 includes three-way pipe 14 and agitator 15, and three Two branched pipes of siphunculus 14 connect black material ascending pipe 8 and white material ascending pipe 7 respectively, and agitator 15 is located at the supervisor of three-way pipe 14 Inside, agitator 15 are made up of agitating shaft and the helical blade being located on agitating shaft;
(6)After installation, injection test slurry first is carried out to black material ascending pipe 8 and white material ascending pipe 7 with clear water, examines pipeline to be It is no unimpeded, and Double-liquid mud-injection pump 11 is checked comprehensively, determine that 11 each part of Double-liquid mud-injection pump is intact, wind examination in parallel Pump, grain slag is blown off in pipe;
(7)Inspection finishes, and is expected with solid Te Jiehei and Te Jiebai expects the solid prompt composite of spy mixed admittedly(It is Gu special prompt multiple Condensation material is existing mature technology)Drilling, 1 aperture is simply blocked, and solid special prompt sealing of hole sections 12 is formed, in the solid prompt sealing of hole of spy Grouting Pipe 10 is penetrated at section 12 and connects in general grouting pump progress cement injection sealing of hole, the annular between hole sealing tube 2 and drilling 1 is empty Air in chamber is discharged by upper air-vent 3 and lower steam vent 4, and when slurries are reached at lower steam vent 4, slurries enter hole sealing tube In 2, cement injection sealing of hole sections 9 are formed in the toroidal cavity between hole sealing tube 2 and drilling 1, start anti-slurry, slip casting in hole sealing tube 2 Complete;
(8)The dosage that solid Te Jiehei material and solid Te Jiebai expect is calculated according to punching coal output, calculates solid Te Jiehei material and solid Te Jiebai material are calculated with formula below:
V in formulaMaterialFor the dosage sum of solid Te Jiehei material and solid Te Jiebai material, MCoalFor hydraulic flushing in hole coal output, ρCoalFor coal Apparent density 1.51t/m3, K is the coefficient of expansion after grout material reaction, K values 20, calculates to obtain VMaterial=0.165m3, then use two fluid grouting Pump 11 stirs load weighted solid Te Jiehei material and solid Te Jiebai material through black material ascending pipe 8 and white material ascending pipe 7 into mixing respectively Being injected after mixing device 13 in punching hole 6, gas enters sealing of hole through upper air-vent 3 and discharged in punching hole 6, after injection, Gu special prompt composite foaming and intumescing, complete solid special prompt obturation 23 is formed full of whole punching hole 6;
(9)After the completion of material feeding, black material ascending pipe 8 and white material ascending pipe 7 are pulled down, Double-liquid mud-injection pump 11 and black is cleaned with clear water Ascending pipe 8 and white material ascending pipe 7 are expected in case next drilling 1 uses;
(10)The construction extraction borehole 17 around drilling 1, and in coal seam section tripping in extraction screen casing 16, rock section tripping in drainage tube 18, after carrying out " one stifled a note " sealing of hole, drainage tube 18 is accessed into extraction pipeline carry out connection and take out, the construction of this group finishes repeat step (2)Arrive(9)The construction of next drilling 1 is carried out, until all construction finishes extraction borehole 17, covers whole exposed coal region.
The present embodiment is not that the shape to the present invention, material, structure etc. make any formal limitation, every according to this hair Any simple modification, equivalent change and modification that bright technical spirit is made to above example, belongs to the technology of the present invention side The protection domain of case.

Claims (6)

1. coal uncovering method under the complex geological condition of pole, it is characterised in that:Comprise the following steps:
(1)Situation analysis is carried out to geology:Judge whether the geology belongs to extremely complex coal bed, be then divided into extremely complex coal bed Ith, II, III 3 class hierarchy, and corresponding design mistake;
(2)Punching standard is designed:I class hierarchy, II class hierarchy and III class hierarchy design punching volume of producing coal account for master control respectively 2%, 3% and the 4% of volume;
(3)Budgetary estimate hydraulic flushing in hole parameter;
(4)Stone door punching coal operation is carried out to coal seam under the complex geological condition of pole;
The step(4)Comprise the following steps that:
A records drilling depth, coal seam in the bottom plate extraction lane of underground coal mine construction layer-through drilling, progress hydraulic flushing in hole operation Thickness and rush coal output;
B carries out inspecting hole operation using hole sealing tube to drilling, finds there is collapse hole position during inspecting hole operation, using rig by collapse hole position Penetrating suitable hole;
C designs the length of device for filling, upper air-vent position, lower exhaust hole site according to drilling depth and coal seam thickness and filled Fill in material hole site;
The device for filling with mixed stirring device, black material ascending pipe and white material ascending pipe mounted in advance is installed to brill by d Hole setting position;
After e installations, check whether filling line and Double-liquid mud-injection pump are intact;
F carries out sealing of hole using cement injection to drilling;
The dosage that g expects according to the solid Te Jiehei material of coal weighing and solid Te Jiebai is gone out, solid Te Jiehei is expected using Double-liquid mud-injection pump With solid Te Jiebai material respectively after black material ascending pipe and white material ascending pipe enter mixed stirring device in the hole of injection hole;
After the completion of h material feedings, pull down black material ascending pipe and white material ascending pipe, with clear water clean Double-liquid mud-injection pump, black material ascending pipe and White material ascending pipe;
I repeat steps a to step h carries out the construction of next drilling, and extraction borehole of being constructed around drilling, and extraction borehole is sealed Hole simultaneously carries out connection and takes out operation;
The division of geologic assessment grade is as shown in table below:
,
D is bore diameter.
2. coal uncovering method under pole complex geological condition as claimed in claim 1, it is characterised in that:Described construction is complicated Index,
Wherein:For seam inclination complex exponent,,For coal seam Minimum angle-of-incidence and inclination maximum;KPleatFor fold Complex degree coefficient,For stone The length of certain contour in door region,For both ends distance of the contour in the section, n is the contour number of statistics;KIt is disconnected For tomography complexity coefficient,, H is fault throw, and L is tomography development length, and S is statistics Area.
3. coal uncovering method under pole complex geological condition as claimed in claim 2, it is characterised in that:Budgetary estimate hydraulic flushing in hole is joined Number includes prediction single hole and produced coal volume V1With calculate total punching number m,, h is that average coal is thick in formula, and b is Punching hole short axle, punching hole are shaped as spheroid, and I, II, III class coal takes 3d, 3.5d, 4d respectively, and d is bore diameter;, v is control coal cumulative volume;A is that punching is produced coal standard, and a value takes 2%, 3%, 4% respectively in I, II, III class coal.
4. coal uncovering method under pole complex geological condition as claimed in claim 3, it is characterised in that:Device for filling includes envelope Kong Guan, black material ascending pipe, ascending pipe, mixed stirring device and Double-liquid mud-injection pump are expected in vain, black material ascending pipe, expect ascending pipe in vain and mix Close agitating device to be each provided inside hole sealing tube, two discharging openings of Double-liquid mud-injection pump expect ascending pipe with black material ascending pipe and in vain respectively Charging aperture connection, black material ascending pipe and in vain expect ascending pipe discharging opening be connected with the charging aperture of mixed stirring device, sealing of hole Pipe top is respectively equipped with upper air-vent, filling material hole and lower steam vent successively from top to bottom.
5. coal uncovering method under pole complex geological condition as claimed in claim 4, it is characterised in that:Calculate solid Te Jiehei material Calculated with solid Te Jiebai material dosages using formula below:, V in formulaMaterialFor solid Te Jiehei material and Gu Te Prompt white material dosage sum, MCoalFor hydraulic flushing in hole coal output,For the apparent density of coal, K is the coefficient of expansion after grout material reaction, and K takes Value 20.
6. coal uncovering method under pole complex geological condition as claimed in claim 4, it is characterised in that:Mixed stirring device bag Three-way pipe and agitator are included, two branched pipes of three-way pipe connect black material ascending pipe and white material ascending pipe respectively, and agitator is located at The main pipe of three-way pipe, agitator are made up of agitating shaft and the helical blade being located on agitating shaft, and the supervisor of three-way pipe passes through Filling material hole is extend into punching hole.
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