CN111764863B - Method for blocking water gushing of high-pressure drilling hole in underground fault fracture zone - Google Patents
Method for blocking water gushing of high-pressure drilling hole in underground fault fracture zone Download PDFInfo
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- CN111764863B CN111764863B CN202010621001.3A CN202010621001A CN111764863B CN 111764863 B CN111764863 B CN 111764863B CN 202010621001 A CN202010621001 A CN 202010621001A CN 111764863 B CN111764863 B CN 111764863B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 238000005553 drilling Methods 0.000 title claims abstract description 62
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000000903 blocking effect Effects 0.000 title claims description 9
- 239000011435 rock Substances 0.000 claims abstract description 35
- 239000004568 cement Substances 0.000 claims description 25
- 230000003014 reinforcing effect Effects 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 17
- 230000002787 reinforcement Effects 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 7
- 239000003673 groundwater Substances 0.000 claims description 4
- 229910001018 Cast iron Inorganic materials 0.000 claims description 3
- 238000007711 solidification Methods 0.000 claims 1
- 230000008023 solidification Effects 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 23
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000002627 tracheal intubation Methods 0.000 abstract description 4
- 239000003245 coal Substances 0.000 description 6
- 239000011148 porous material Substances 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 239000011440 grout Substances 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 201000004569 Blindness Diseases 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimising the spacing of wells comprising at least one inclined or horizontal well
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
- E21B7/046—Directional drilling horizontal drilling
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
- E21F16/02—Drainage of tunnels
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Abstract
A method for plugging water gushing of a high-pressure drill hole in an underground fault fracture zone utilizes an underground directional drilling technology to plug water gushing of the high-pressure drill hole in the fault fracture zone, can effectively solve the problem that a conventional drilling drainage hole is difficult to expose a water gushing drill hole, and improves construction efficiency; meanwhile, the remote directional drainage hole is constructed in a safe area, so that operators in the hole can be prevented from being exposed in a high-water-pressure and broken surrounding rock construction area by an in-hole intubation drainage grouting method, and the construction risk of the operators is effectively reduced.
Description
Technical Field
The invention relates to a water gushing and blocking technology for underground drilling, belongs to the technical field of water prevention and control and underground water resource protection in coal mines, and particularly relates to a method for blocking high-pressure drilling water gushing in an underground fault fracture zone.
Background
The water burst of the underground drilling is a main type of water damage of a coal mine, and common plugging treatment technologies comprise retaining wall building grouting, static pressure grouting, drainage grouting and the like aiming at the water damage type of the underground drilling. The treatment method has the following advantages and disadvantages: the grouting method for building the retaining wall is characterized by safety and reliability, but needs to block the roadway, and has large engineering quantity and long construction period; the static pressure grouting method is suitable for water burst control of medium-low water pressure drill holes, and aims at high water pressure and broken surrounding rocks, the surrounding rocks need to be reinforced and then grouted, but secondary disturbance can be generated on the surrounding rocks by drilling and grouting of reinforced holes, and the operation risk is large; the underground drainage grouting method has short construction period and small work amount, but has the following problems: the construction of the external drainage hole is limited by the conventional drilling technology in the well, the water-bursting drill hole is difficult to expose at one time, the construction has certain blindness, the in-hole intubation drainage grouting method needs to operate at the water-bursting drill hole of the high-water-pressure and broken surrounding rock, the threat to operators is large, and simultaneously the high-water-pressure is easy to disperse slurry, so that the drainage tube is not beneficial to the well cementation work of the drainage tube, and the uncertain risk is brought to the high-pressure grouting in the subsequent hole. The underground fault fracture zone high-pressure drilling has the characteristics of surrounding rock fracture and high water pressure, and aiming at water gushing of the type, the masonry retaining wall grouting efficiency is low, the static pressure grouting risk is high, the external drainage grouting efficiency is low, and the internal drainage grouting risk is large.
Therefore, how to safely and efficiently block the water gushing of the high-pressure drilling hole in the underground fault fracture zone is a technical problem which is difficult to solve for a long time in the field.
Therefore, in view of the above defects, the designer of the invention researches and designs a method for blocking the high-pressure drilling water inrush in the fault fracture zone in the well through careful research and design and by combining the experience and the result of the related industry for years, so as to overcome the above defects.
Disclosure of Invention
The invention aims to provide a method for plugging high-pressure drilling water gushing of a fault fracture zone in an underground well, which can effectively solve the problems of large engineering quantity, long construction period, large operation risk, poor drainage effect and poor grouting effect caused by the conventional method for plugging the high-pressure drilling water gushing of the fault fracture zone by utilizing an underground directional drilling technology.
In order to achieve the purpose, the invention discloses a method for blocking water gushing from a high-pressure drilling hole in an underground fault fracture zone, which is characterized by comprising the following steps of:
the method comprises the following steps: selecting a complete and hard section in a roof rock stratum as a directional drilling hole opening position, respectively constructing a directional drainage hole and a directional reinforcing hole, wherein a final hole of the directional drainage hole penetrates through a water gushing drill hole, the number of the directional drainage holes is 1-3, the final hole position of the directional reinforcing hole penetrates through a fault fracture zone, and the number of the directional reinforcing holes is 2-5;
step two: a drainage device is arranged in the directional drainage hole, water in the water gushing drill hole is led out from the directional drainage hole, the water pressure during grouting of the lower section of the water gushing drill hole is reduced, water in the hole is led to the directional drainage hole, the drainage hole is well-cemented, and the cement is cured for 48 hours;
step three: grouting reinforcement is carried out on the broken rock stratum of the top plate near the fault and the drill hole through the directional reinforcement hole;
step four: grouting the lower section of the water gushing drill hole, stopping grouting after the grout returns from the drainage hole through the drainage device, closing the water gushing drill hole valve, and completing grouting filling of the lower section of the water gushing drill hole after the grout is solidified for 48 hours;
step five: and grouting the upper section of the water burst drilling hole from the drainage hole, closing a water burst drilling valve, and after the grouting is completed for 48 hours, finishing the grouting of the upper section of the water burst drilling hole.
Wherein: the pore diameter of the naked pore section of the directional drainage hole is larger than the pore diameter of the water gushing drill hole.
Wherein: and constructing 1-3 directional drainage holes and 2-5 directional reinforcing holes, wherein the two directional reinforcing holes are positioned below the directional drainage holes and comprise a first directional reinforcing hole and a second directional reinforcing hole which are respectively arranged at two sides of the directional drainage holes.
Wherein: the final hole reveals more than half of the vertical height of the water gushing drill hole.
Wherein: the arrangement of the directional reinforcement holes is determined according to the formulas 1 and 2:
equation 1 is a slurry diffusion radius calculation equation:
wherein R is the diffusion radius of the slurry and the unit is m; p is a radical of formulacThe pressure in the grouting hole is used; p is a radical of0The groundwater pressure in the fracture; t is grouting time; delta is the crack width; r iscIs the radius of the grouting hole; mu is the viscosity of the slurry;
formula 2 is a formula for calculating the radius of the surrounding rock loosening zone of the roadway:
in the formula R1The radius of a plastic zone of the surrounding rock is m; r is0Is the radius of the roadway; sigma0Is the stress of the original rock;
is an internal friction angle; c is cohesive force; p isiTo support resistance.
Wherein: the drainage device comprises a drainage tube and a drainage device, the drainage tube is made of cast iron, the wall thickness of the drainage tube is 2-5 mm, the length of the drainage device is 0.2-0.5 m, and the drainage device is welded at one end of the drainage tube.
Wherein: the drainage tube is formed by connecting a plurality of cylindrical tubes, the cylindrical tubes of the drainage tube are connected through screw threads, and the drainage tube is placed in the directional drainage hole through a drilling machine.
Wherein: the drainage device is a four-leaf drainage device.
Wherein: the material used for grouting in the fourth step is cement paste, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is low-pressure filling grouting, and the grouting pressure is not more than 3 MPa.
Wherein: and fifthly, the materials used for grouting are cement paste, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is high-pressure filling and permeation grouting, and the pressure of the grouting end is 2 times of the water pressure.
According to the above content, the method for blocking the high-pressure drilling gushing water in the underground fault fracture zone has the following effects:
1. by utilizing the underground directional drilling technology, the problem that the conventional drilling drainage hole is difficult to expose a water bursting drill hole can be effectively solved, and the construction efficiency is improved; meanwhile, the long-distance directional drainage holes in the safe region are selected for construction, so that the condition that operators in the holes are exposed in the high-water-pressure and broken surrounding rock construction region by an intubation drainage grouting method can be avoided, and the construction risk of the operators is effectively reduced.
2. The hole distribution mode comprehensively considers the surrounding rock body reinforcement and water gushing drilling drainage, and meanwhile, the defects of complex drilling and grouting engineering procedures, long construction period and large number of drilled holes in the conventional construction reinforced hole are effectively overcome by utilizing the higher drilling efficiency and the accurate drilling control of the underground directional drilling technology.
3. The grouting process effectively reduces the secondary damage of drilling and grouting of conventional reinforced holes to surrounding rocks in construction, and ensures the construction safety.
The details of the present invention can be obtained from the following description and the attached drawings.
Drawings
FIG. 1 shows a schematic cross-sectional view of a downhole directional drilling arrangement for the method of plugging a high pressure borehole kick in a downhole fault fracture zone of the present invention.
FIG. 2 shows a schematic plan view of a downhole directional drilling arrangement of the present invention.
Fig. 3 shows a three-dimensional schematic view of the drainage device of the present invention.
Fig. 4 shows a schematic top view of the drainage device of the present invention.
Figure 5 shows a schematic of the pre-grouting borehole water burst of the present invention.
Fig. 6 shows a drainage diagram of the drainage device of the present invention.
FIG. 7 shows a schematic view of directional consolidation hole grouting consolidation according to the present invention.
Fig. 8 shows a schematic view of the lower low pressure pad grouting of the water gushing borehole of the present invention.
FIG. 9 shows a schematic diagram of the high-pressure sealing grouting of the drainage hole of the invention.
Reference numerals are as follows:
1, a mudstone water barrier; 2, a coal seam; 3-1, digging no roadway; 3-2 digging a roadway; 4 sandstone aquifer; 5, fault treatment; 6, drilling a hole; 7 directional drainage holes; 8, directional reinforcing holes; 9 a drainage tube; 10, a drainage device; 11, cementing the water gushing hole by using cement; 12 flowing the groundwater in the aquifer; 13, cementing the drainage hole; 14, the flow direction of cement paste is in low-pressure grouting of the directional reinforcing hole; 14-1, the flow direction of cement paste is in the process of low-pressure filling and grouting at the lower section of the water gushing drill hole; and (3) the flow direction of cement paste is in high-pressure grouting in the 14-2 directional drainage hole.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and it should be understood that when the terms "comprises" and "comprising" are used in this specification, they specify the presence of the stated features, steps, operations and/or combinations thereof.
The invention is described in detail below with reference to the drawings and the detailed description.
In the process of tunneling a certain mine roadway of a Jurassic coal field in Ordos basin, a water advanced exploring and discharging drill hole 6 is implemented (as shown in figure 1, the hole depth of the drill hole is 120m, the vertical height is 100m, the inclination angle is 60 degrees, the aperture of a naked hole section is 50mm), a fault 5 is arranged in front of the head of the roadway, the drill hole reveals a sandstone water bearing layer 4 with a top plate high pressure, the water pressure of the hole is more than 4MPa, and the water quantity is more than 200m3H is used as the reference value. Large area water spraying (water amount > 20 m) occurs on the top plate near the back drilling hole of the closed orifice valve3And h), simultaneously, under the action of long-time high-water-pressure soaking and fault, a roof rock stratum near a drill hole is broken and sinks (the sinking amount is about 0.1m), the safety of a mine is seriously threatened, and grouting and hole sealing are required.
The bottom of the water-inrush borehole is a mud water-resisting layer 1, a coal seam 2 is arranged on the mud water-resisting layer 1, the coal seam 2 comprises an unearthed roadway 3-1 and an excavated roadway 3-2, meanwhile, referring to fig. 6, the rear end of the water-inrush borehole 2 is subjected to water-inrush borehole cement cementing 11, and an arrow in a sandstone aquifer 4 at the front end shows the flow direction 12 of aquifer underground water.
As described in the background art, common plugging treatment technologies include retaining wall grouting, static pressure grouting, drainage grouting, and the like for downhole borehole water burst. And high-pressure drilling in a fault fracture zone has the characteristics of surrounding rock fracture and high water pressure, and for the water burst of the type, the built retaining wall grouting efficiency is low, the static pressure grouting risk is high, the external drainage grouting efficiency is low, and the internal drainage grouting risk is large.
Therefore, the method for blocking the high-pressure drilling gushing water in the underground fault fracture zone comprises the following steps:
the method comprises the following steps: the method is characterized in that a complete and hard section in a roof rock stratum is selected as a directional drilling hole opening position (figure 1), a directional drainage hole and a directional reinforcing hole are respectively constructed, the purpose of constructing the directional drainage hole is to drain water flowing out of a water flowing drilling hole through the drainage hole, and safety guarantee is provided for grouting plugging of the water flowing drilling hole. The drill hole inclination angle of the directional drainage hole is larger, and the final hole is positioned at more than half of the vertical height of the water gushing drill hole and penetrates through the water gushing drill hole; the azimuth angle is calculated according to the water outlet hole track, and the purpose of revealing the water burst drilling hole is achieved; the pore diameter of the naked pore section is larger than the pore diameter of the water gushing drill hole, wherein the number of the directional drainage holes is 1-3. The purpose of constructing the directional reinforcing holes is to reinforce surrounding rocks in fault fracture zones and ensure the safety of subsequent grouting. And (3) calculating an inclination angle and an azimuth angle according to the slurry diffusion radius and the roadway surrounding rock loosening ring, so that the upper broken rock body of the roadway roof surrounding rock loosening ring is reinforced, the final hole position penetrates through a fault broken zone, and the number of directional reinforcing holes is 2-5.
In the illustrated embodiment, based on the water inrush drilling inclination data, 1 directional drainage hole 7 and 2 directional reinforcement holes 8 are constructed, the two directional reinforcement holes 8 being located below the directional drainage hole 7 and including first and second directional reinforcement holes 8-1 and 8-2 (see fig. 1 and 2) arranged at both sides of the directional drainage hole 7. Preferably, the aperture of the naked hole section of the directional drainage hole 7 is 91mm, the vertical height of a water-gushing drilling hole exposed in a final hole is more than 50m, and the arrangement of the directional reinforcing holes is determined according to the formulas 1 and 2.
Equation 1 is a slurry diffusion radius calculation equation:
wherein R is the diffusion radius of the slurry and the unit is m; p is a radical of formulacFor grouting the pressure in the hole, 2 x 10 is preferably used6pa；p0For the groundwater pressure in the fracture, 1 x 10 is preferred6pa; t is grouting time, preferably 1500 s; delta is the width of the crack, and is preferably 0.01 m; r iscThe radius of the grouting hole is preferably 0.0455 m; mu is the slurry viscosity, preferably 140 mPas.
Calculated R ≈ 6 in the preferred embodiment.
Formula 2 is a formula for calculating the radius of the surrounding rock loosening ring of the roadway:
in the formula R1The radius of a plastic zone of the surrounding rock is m; r0The preferable roadway width is 5m, and 2.5m is taken as the roadway radius; sigma0For the stress of the original rock, it is preferable to take 16 x 106N/m2；
The internal friction angle is preferably 35 degrees; c is cohesion, preferably 6 x 106pa；PiFor supporting the resistance, preferably irrespective of the supporting conditions, PiIs 0.
Calculated preferred embodiment R1＝2.69m。
Therefore, in a preferred embodiment, the final hole sag of the directional reinforcement hole is 2.69m +6m to 8.69m, and more preferably 10 m; the hole pitch was 12 m.
Step two: the directional drainage hole is internally provided with a drainage device (see figure 6), and the drainage device is placed in the directional drainage hole, so that water in the water-gushing drill hole is led out from the directional drainage hole, the water pressure during grouting of the lower section of the water-gushing drill hole is reduced, and the grouting safety is ensured. The drainage device comprises a drainage tube 9 and a drainage device 10, the drainage tube is made of cast iron, the wall thickness of the drainage tube is 2-5 mm, the length of the drainage device is 0.2-0.5 m, and the drainage device is welded at one end of the drainage tube. When the water gushing drill hole is communicated with the water gushing drill hole, the quadralobe-shaped drainage device can cut the water gushing drill hole into two parts, water at the upper section of the water gushing drill hole is led out from the drainage hole through two blades in the quadralobe-shaped drainage device, and the other two blades play a role in returning slurry during grouting at the lower section of the water gushing drill hole.
Referring to fig. 3 and 4, in one embodiment, the diameter of the drainage tube 9 is 63.5mm, the drainage tube can be formed by connecting a plurality of cylindrical tubes, the length of a single cylindrical tube is preferably 1.5m, the flow diverter 10 is welded at one end of the drainage tube 9, the cylindrical tubes of the drainage tube are connected through screw threads and are placed in the directional drainage hole 7 through a drilling machine, in the embodiment, the flow diverter 10 is a four-leaf flow diverter which extends into the directional drainage hole and blocks a water gushing drilling hole, and two leaves guide water in the hole to the directional drainage hole for drainage hole cementing 13 to be cemented for 48 h.
Step three: grouting reinforcement is carried out on the broken rock layer of the top plate near the fault and the drill hole through the directional reinforcement holes 8 (as shown in figure 7). The grouting material is cement paste, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is low-pressure permeation grouting, the pressure after grouting is not more than 3MPa, after grouting is finished, the strength and the impermeability of a roof rock layer and a fault fracture zone near a drill hole are improved, and the safety of filling and grouting at the lower section of a water burst drill hole in the next step is guaranteed. The arrows in fig. 7 show the direction of cement flow 14 during low pressure grouting of the directional consolidation holes.
Step four: and (3) grouting the lower section of the water gushing drill hole (see figure 8), wherein the grouting material is cement slurry, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is low-pressure filling grouting, the grouting pressure is not more than 3MPa, after grout returns from the drainage holes from the other two leaves in the four-leaf drainage device, stopping grouting, closing a water gushing drill hole valve, and waiting for setting for 48 hours. And after grouting is finished, filling the lower section of the water gushing drill hole. The arrows in FIG. 8 show the direction of cement slurry flow 14-1 during low pressure pad grouting in the lower section of the water gushing borehole.
Step five: the upper section of the gush was grouted (see figure 9). The grouting material is cement paste, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is high-pressure filling and permeation grouting, and the pressure of the grouting end is 2 times of the water pressure, namely not less than 8 MPa. And closing the water-gushing drilling valve, and waiting for 48h of coagulation. And after grouting is finished, grouting is finished at the upper section of the water-gushing drill hole. The arrows in FIG. 9 show the direction of grout flow 14-2 during directional bore high pressure grouting.
Therefore, the invention has the advantages that:
(1) the invention utilizes the underground directional drilling technology to effectively solve the problem that the conventional drilling drainage hole is difficult to expose a water-bursting drill hole, thereby improving the construction efficiency; meanwhile, the long-distance directional drainage holes in the safe region are selected for construction, so that the condition that operators in the holes are exposed in the high-water-pressure and broken surrounding rock construction region by an intubation drainage grouting method can be avoided, and the construction risk of the operators is effectively reduced.
(2) The hole distribution mode comprehensively considers the surrounding rock body reinforcement and the water inrush drilling drainage, and simultaneously utilizes the higher drilling efficiency and the accurate drilling control of the underground directional drilling technology to effectively overcome the defects of complicated drilling and grouting engineering procedures, long construction period and large number of drilled holes of the conventional reinforced hole.
(3) The grouting process disclosed by the invention effectively reduces the secondary damage of drilling and grouting of conventional reinforcing holes to surrounding rocks in construction, and ensures the construction safety.
It should be apparent that the foregoing description and illustrations are by way of example only and are not intended to limit the present disclosure, application or uses. While the embodiments have been described in the embodiments and depicted in the drawings, the present invention is not limited to the particular examples illustrated by the drawings and described in the embodiments as the best mode presently contemplated for carrying out the teachings of the present invention, and the scope of the present invention is intended to include any embodiments falling within the foregoing description and the appended claims.
Claims (6)
1. A method for blocking water gushing of a high-pressure drilling hole in a fault fracture zone in a well is characterized by comprising the following steps:
the method comprises the following steps: selecting a complete and hard section in a roof rock stratum as a directional drilling hole opening position, respectively constructing directional drainage holes and directional reinforcing holes, wherein the hole diameter of a naked hole section of each directional drainage hole is larger than that of a water gushing drilling hole, a final hole of each directional drainage hole penetrates through the water gushing drilling hole, the number of the directional drainage holes is 1-3, the final hole position of each directional reinforcing hole penetrates through a fault crushing zone, the number of the directional reinforcing holes is 2-5, and the arrangement of the directional reinforcing holes is determined according to formulas 1 and 2:
formula 1 is a slurry diffusion radius calculation formula:
wherein R is the slurry diffusion radius and the unit is m; p is a radical ofcIs the pressure in the grouting hole; p is a radical of formula0The groundwater pressure in the fracture; t is grouting time; delta is the crack width; r iscIs the radius of the grouting hole; mu is the viscosity of the slurry;
formula 2 is a formula for calculating the radius of the surrounding rock loosening zone of the roadway:
in the formula R1The radius of a plastic zone of the surrounding rock is m; r is0Is the radius of the roadway; sigma0Is the stress of the original rock;
is an internal friction angle; c is cohesive force; piThe resistance is used for supporting;
step two: a drainage device is arranged in the directional drainage hole, water in the water gushing drill hole is led out from the directional drainage hole, the water pressure during grouting of the lower section of the water gushing drill hole is reduced, water in the hole is led to the directional drainage hole, the drainage hole is well-cemented, and the cement is cured for 48 hours;
step three: grouting reinforcement is carried out on the fault and the broken rock stratum of the top plate near the drilling hole through the directional reinforcement hole, the grouting material is cement slurry, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is low-pressure permeation grouting, the pressure after grouting is finished is not more than 3MPa, after grouting is finished, the strength and the impermeability of the broken rock stratum of the top plate near the drilling hole and the fault are improved, and the safety of filling and grouting at the lower section of the water gushing drilling hole in the next step is ensured;
step four: grouting the lower section of the water gushing drill hole, wherein the grouting material is cement slurry, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is low-pressure filling grouting, the grouting pressure is not more than 3MPa, the grouting is stopped after the slurry returns from the drainage hole through the drainage device, the water gushing drill hole valve is closed, the solidification lasts for 48 hours, and after the grouting is finished, the grouting filling of the lower section of the water gushing drill hole is finished;
step five: and (3) grouting the upper section of the water-gushing drill hole from the drainage hole, wherein the grouting material is cement paste, the water cement ratio is 0.7: 1-1.2: 1, the grouting mode is high-pressure filling and permeation grouting, the pressure after grouting is 2 times of the water pressure, namely not less than 8Mpa, the water-gushing drill hole valve is closed, and after the grouting is finished for 48 hours, the grouting of the upper section of the water-gushing drill hole is finished.
2. The method of plugging a downhole fault fracture zone high pressure borehole kick of claim 1, wherein: and constructing 1-3 directional drainage holes and 2-5 directional reinforcing holes, wherein the two directional reinforcing holes are positioned below the directional drainage holes and comprise a first directional reinforcing hole and a second directional reinforcing hole which are respectively arranged at two sides of the directional drainage holes.
3. The method of plugging a downhole fault fracture zone high pressure borehole kick of claim 1, wherein: the final hole exposes more than half of the vertical height of the water gushing drill hole.
4. The method of plugging a downhole fault fracture zone high pressure borehole kick of claim 1, wherein: the drainage device comprises a drainage tube and a drainage device, the drainage tube is made of cast iron, the wall thickness of the drainage tube is 2-5 mm, the length of the drainage device is 0.2-0.5 m, and the drainage device is welded at one end of the drainage tube.
5. The method of plugging a downhole fault fracture zone high pressure borehole kick of claim 4, wherein: the drainage tube is formed by connecting a plurality of cylindrical tubes, the cylindrical tubes of the drainage tube are connected through screw threads, and the drainage tube is placed in the directional drainage hole through a drilling machine.
6. The method of plugging a downhole fault fracture zone high pressure borehole kick of claim 4, wherein: the drainage device is a four-leaf drainage device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621001.3A CN111764863B (en) | 2020-07-01 | 2020-07-01 | Method for blocking water gushing of high-pressure drilling hole in underground fault fracture zone |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010621001.3A CN111764863B (en) | 2020-07-01 | 2020-07-01 | Method for blocking water gushing of high-pressure drilling hole in underground fault fracture zone |
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| Publication Number | Publication Date |
|---|---|
| CN111764863A CN111764863A (en) | 2020-10-13 |
| CN111764863B true CN111764863B (en) | 2022-07-22 |
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| CN112412532B (en) * | 2020-11-27 | 2023-02-28 | 陕西旬邑青岗坪矿业有限公司 | Advanced prevention and control method for water damage of fault roof of working face |
| CN112431578B (en) * | 2020-12-02 | 2022-07-29 | 山西潞安环保能源开发股份有限公司常村煤矿 | Method for extracting mine gas from low-permeability coal seam containing fault |
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| CN102587859A (en) * | 2012-04-17 | 2012-07-18 | 中国矿业大学(北京) | Technology for blocking mine water bursting through backflow grouting |
| CN105909207A (en) * | 2016-04-19 | 2016-08-31 | 安徽恒源煤电股份有限公司 | Grouting, pipe fixing and plugging technique for deep drainage hole wall in water inrush borehole |
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