CN111663918A - Coal mining ground grouting process and grouting structure - Google Patents
Coal mining ground grouting process and grouting structure Download PDFInfo
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- CN111663918A CN111663918A CN202010662825.5A CN202010662825A CN111663918A CN 111663918 A CN111663918 A CN 111663918A CN 202010662825 A CN202010662825 A CN 202010662825A CN 111663918 A CN111663918 A CN 111663918A
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- sleeve
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- pipe
- grouting
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/138—Plastering the borehole wall; Injecting into the formation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
- E21B17/02—Couplings; joints
- E21B17/08—Casing joints
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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
- E21B33/12—Packers; Plugs
- E21B33/1208—Packers; Plugs characterised by the construction of the sealing or packing means
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
Abstract
The invention discloses a coal mining ground grouting process and a grouting structure, and relates to the field of drilling and grouting. According to the invention, the open sleeve is arranged, the open sleeve has the functions of wall protection and water stop, the phenomenon of flushing fluid loss can be caused in the process of penetrating the goaf from the lower part, and in order to prevent accidents caused by collapse of a new upper stratum due to the leakage of the flushing fluid, the communication between each aquifer in the new upper stratum and the goaf from the lower part can be prevented in the drilling process, so that the water inflow of a mine is increased; meanwhile, when the double-opening sleeve is used, the double-opening sleeve has the functions of reinforcing and guiding liquid.
Description
Technical Field
The invention relates to the field of drilling grouting, in particular to a coal mining ground grouting process and a grouting structure.
Background
When the ground drilling construction is carried out, a series of technical problems that flushing fluid is lost due to rock mass crushing, rock powder formed by drilling in a hole cannot be normally taken out of the hole to cause a drill burying accident, a drilling tool is damaged and cannot timely react to cause a drilling burning condition, and drilling accidents (drill sticking and drill burying) caused by collapse and block falling of a hole wall can be met.
The drilling structure refers to the change of the depth and the caliber of each hole section in the drilling section from the opening to the final hole. Generally, the more the diameter changing times, the more complicated the drilling structure; the fewer the number of diameter changes, the simpler the drilling structure. The purpose and purpose of drilling is the basis for the design of the drilling structure. The purpose of drilling is in order to carry out the slip casting reinforcement to the broken roof in coal seam. The stratum that the drilling hole generally passes through is the third zone on the fourth series unconsolidated formation, coal measure stratum and coal seam collecting space area, and the third zone on the collecting space area has short stabilization time, and the rock is broken, and separation, fracture development inevitably can take place to flush fluid leakage during the drilling construction.
Disclosure of Invention
In order to solve the defects mentioned in the background technology, the invention aims to provide a coal mining ground grouting process and a grouting structure, wherein an open sleeve is arranged, the open sleeve has the functions of wall protection and water stop, the phenomenon of flushing fluid leakage can be caused in the process of penetrating a goaf at the lower part, and in order to prevent accidents caused by collapse of a new upper stratum due to the leakage of the flushing fluid, the communication between each aquifer in the new upper stratum and the goaf at the lower part can be prevented in the drilling process, so that the water inflow of a mine is increased;
meanwhile, when the grouting material is used, the two sleeves are arranged and have the functions of reinforcement and liquid guiding, the two sleeves are designed in the one sleeve, on the basis of ensuring that a complete hole is formed, cement slurry is used for fixing the two sleeves, a drilled hole can be reinforced, the drilled hole can be ensured to be smooth, the slurry is required to be smoothly injected into a target layer, a channel is required, the two sleeves can be used as a channel for guiding the slurry, and the slurry can be ensured to directly reach the target layer.
The purpose of the invention can be realized by the following technical scheme:
a coal mining ground grouting structure comprises a ground, wherein the ground comprises a fourth series loose layer, a stable foundation layer and a coal layer, a first drilling hole is formed in the fourth series loose layer, an open casing is arranged on the inner side of the first drilling hole, a first cement paste fixing pipe is arranged on the outer side wall of the open casing, and the first cement paste fixing pipe is tightly attached to the inner side wall of the first drilling hole;
the coal seam drilling method is characterized in that a second drilling hole is formed in the bottom of the first drilling hole and in the stable foundation layer, a second opening sleeve is arranged in the second drilling hole, the first opening sleeve and the second opening sleeve are both arranged in a hollow mode, a second cement paste fixing pipe is arranged on the outer side wall of the second opening sleeve, the second cement paste fixing pipe is tightly attached to the inner side wall of the second drilling hole, and a third drilling hole is formed in the coal seam and in the bottom of the second drilling hole.
Furthermore, a wood plug is arranged at the bottom of the two-way sleeve, expansion rubber is arranged on the top of the wood plug and on the surface of the two-way sleeve, grouting holes are formed in the top of the expansion rubber and on the surface of the two-way sleeve, and the one-way sleeve and the two-way sleeve are identical in structure.
Furthermore, a fixing piece is arranged at the top of the opening sleeve, the fixing piece is sleeved on the surface of the opening sleeve, and the opening sleeve is connected with the fixing piece in a threaded mode.
Furthermore, the inner side wall of the first sleeve is provided with an internal thread, the outer side wall of the second sleeve is provided with an external thread matched with the first sleeve, and the second sleeve is in threaded connection with the first sleeve.
A coal mining ground grouting process comprises the following steps:
firstly, drilling a hole with a diameter of 130mm in a fourth series unconsolidated formation, drilling to a stable bedrock formation, changing the diameter of 91mm, drilling to a bedrock hard disk, and then logging;
secondly, reaming by using a phi 216mm reamer to form a first drilling hole, putting a phi 177.8mm sleeve, and connecting the phi sleeve with a screw thread;
thirdly, after the sleeve is opened to the bottom, a drill rod with the diameter of 50mm is opened at a position 0.3-0.5 m away from the bottom of the hole, and a cover is added on the upper opening of the sleeve;
fourthly, grouting a water hole through the bottom of the pipe, and totally closing the pipe from the bottom of the hole to the outside of the pipe by a full-hole grouting method to form a first cement paste fixed pipe;
fifthly, after grouting, pressing the replacement water, releasing pressure after 6 hours, taking out the drilling tool, and cleaning the drill rod;
sixthly, after the water is condensed for 48 hours, the through holes are completely penetrated, and after 72 hours, the water stopping effect is checked;
and seventhly, drilling into the coal seam with the aperture of phi 91mm to form a third drilling hole, logging on the top plate 3m of the coal seam, reaming by using a phi 152mm guide reaming bit to form a second drilling hole, lowering a phi 127mm double-opening casing pipe, connecting the double-opening casing pipe by screw threads, and fixing cement outside the pipe to stop water to form a second cement fixed pipe.
Further, the lower parts of the first opening sleeve and the second opening sleeve are treated by using wood plugs.
Furthermore, the expansion rubber is wound outside the first sleeve and the second sleeve, and a grouting hole is reserved at 0.50m above the expansion rubber.
The invention has the beneficial effects that:
1. according to the invention, the open sleeve is arranged, the open sleeve has the functions of wall protection and water stop, the phenomenon of flushing fluid loss can be caused in the process of penetrating the goaf from the lower part, and in order to prevent accidents caused by collapse of a new upper stratum due to the leakage of the flushing fluid, the communication between each aquifer in the new upper stratum and the goaf from the lower part can be prevented in the drilling process, so that the water inflow of a mine is increased;
2. when the grouting device is used, the two sleeves are arranged and have the functions of reinforcement and liquid guiding, the two sleeves are designed in the one sleeve, and cement slurry is used for fixing the two sleeves on the basis of ensuring that a complete hole is formed, so that a drilled hole can be reinforced, the drilled hole can be ensured to be smooth, the slurry is required to be smoothly injected into a target layer, a channel is required, and the two sleeves can be used as a channel for guiding the slurry to directly reach the target layer.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of the present invention;
fig. 2 is a schematic view of the structure of the double-opening sleeve of the invention.
In the figure: 1. a ground surface; 11. a fourth series of loose layers; 12. stabilizing the basal rock stratum; 13. a coal seam; 2. a first bore hole; 3. an opening sleeve; 4. fixing a pipe by first cement paste; 5. a second bore hole; 6. opening a sleeve twice; 61. a wooden plug; 62. an expanded rubber; 63. grouting holes; 7. fixing the pipe by using second cement paste; 8. a third bore hole; 9. and a fixing member.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.
A coal mining ground grouting structure is shown in figures 1 and 2 and comprises a ground 1, wherein the ground 1 comprises a fourth series loose layer 11, a stable foundation layer 12 and a coal bed 13, a first drilling hole 2 is formed in the fourth series loose layer 11, an open casing 3 is arranged on the inner side of the first drilling hole 2, a first cement slurry fixing pipe 4 is arranged on the outer side wall of the open casing 3, and the first cement slurry fixing pipe 4 is tightly attached to the inner side wall of the first drilling hole 2.
The bottom of the first drilling hole 2 is provided with a second drilling hole 5 in a stable foundation layer 12, a second casing 6 is arranged in the second drilling hole 5, the first casing 3 and the second casing 6 are both arranged in a hollow mode, the outer side wall of the second casing 6 is provided with a second cement slurry fixing pipe 7, the second cement slurry fixing pipe 7 is tightly attached to the inner side wall of the second drilling hole 5, and the bottom of the second drilling hole 5 is provided with a third drilling hole 8 in a coal seam 13.
The bottom of the two-way sleeve 6 is provided with a wooden plug 61, the top of the wooden plug 61 and the surface of the two-way sleeve 6 are provided with expansion rubber 62, the top of the expansion rubber 62 and the surface of the two-way sleeve 6 are provided with grouting holes 63, and the structure of the one-way sleeve 3 is the same as that of the two-way sleeve 6.
The top of the opening sleeve 3 is provided with a fixing piece 9, the fixing piece 9 is sleeved on the surface of the opening sleeve 3, and the opening sleeve 3 is connected with the fixing piece 9 in a threaded mode.
The inner side wall of the first sleeve 3 is provided with internal threads, the outer side wall of the second sleeve 6 is provided with external threads matched with the first sleeve 3, and the second sleeve 6 is in threaded connection with the first sleeve 3.
A coal mining ground grouting process comprises the following steps:
firstly, drilling a hole with a diameter of 130mm in a fourth series unconsolidated formation, drilling to bedrock, changing the diameter of 91mm, drilling to a bedrock hard disk, and then logging;
secondly, reaming by using a phi 216mm reamer, putting a phi 177.8mm wall protection sleeve into the hole, and connecting the sleeve by screw threads;
thirdly, after the sleeve is put to the bottom, a drill rod with the diameter of 50mm is put at a position 0.3-0.5 m away from the bottom of the hole, and a cover is added on the upper opening of the sleeve;
fourthly, injecting a water hole through the bottom of the pipe, and totally closing the pipe from the bottom of the hole to the outside of the pipe by a full-hole injection method, wherein the pipe-fixing cement paste adopts cement, triethanolamine and salt;
fifthly, after grouting, pressing the replacement water, releasing pressure after 6 hours, taking out the drilling tool, and cleaning the drill rod;
sixthly, after the through holes are solidified for 48 hours, the through holes are completely filled, after 72 hours, the water stopping effect is checked, after the water stopping check is qualified, the coreless hole sweeping is slowly pressed for 1.5-2.0 m, the normal drilling of the drilling tool is recovered, and the drilling tool combination is as follows:
when the situation that flushing fluid is completely leaked and does not return slurry occurs in an overlying coal seam goaf affected zone in the drilling process of a phi 91mm scraper bit, a phi 89mm drill collar, a phi 63.5mm drill collar and a phi 50mm drill rod, top leakage drilling is needed. In order to reduce the drilling risk to the maximum extent, the drill collar needs to be removed, and the drilling tool comprises the following components:
phi 91mm drag bit + phi 50mm drill rod;
seventhly, drilling to the coal seam roof by using the hole diameter of phi 91mm for 3m, logging, reaming by using a phi 152mm belt guide reaming bit, putting into a phi 127mm geological pipe, connecting a sleeve by screw threads, and fixing the pipe by using cement paste outside the pipe to stop water.
Because the bottom opening of the sleeve is positioned in the upper coal goaf, if the flushing fluid is completely leaked, a special method is adopted for fixing the sleeve, and the method comprises the following steps:
1) the sleeve is reasonably matched, and the lower part of the sleeve is treated by the wooden plug/concrete in advance.
2) And the upper part of the water leakage point of the drill hole is externally wound with expanded rubber, and a grouting hole is reserved on the expanded rubber about 0.50 m.
3) And (3) after the sleeve is placed to the bottom of the hole, placing a drill rod with the diameter of 50mm at a position 0.3-0.5 m away from the wooden plug/concrete, punching, and after the slurry is normally circulated, waiting for the water-stopping rubber to expand.
4) After the water-stopping rubber is expanded, a cover is added on the upper opening of the casing pipe, and the cement paste is totally closed from the reserved grouting hole to the outer pipe by a full hole grouting method.
5) And after grouting, pressing the replacement water, releasing the pressure after 6 hours, taking out the drilling tool, and cleaning the drill rod. After 72 hours of solidification, the hole is penetrated to the wooden plug/concrete, and the effect of grouting and pipe solidification outside the pipe is checked. And after the slurry is qualified, penetrating the through hole to the bottom opening of the sleeve, and performing the next grouting operation.
In conclusion, the grouting drilling hole is smoothly formed, and the following measures are mainly adopted:
(1) the first measure is as follows: the two-opening casing structure is used, one casing plays a role in protecting a wall and protecting a new stratum, when a drill hole penetrates through the stratum at the lower part, the new stratum is guaranteed not to collapse, meanwhile, the fact that each water-bearing layer in the upper new stratum is communicated with a goaf at the lower part in the drilling process is prevented, the two casings play a role in reinforcing and guiding liquid, an effectively communicated whole is formed between the two casings and the one casing through cement slurry, the stability of the drill hole is remarkably enhanced, and meanwhile, the two casings serve as slurry channels to guarantee that the slurry can directly reach a target layer.
(2) And step two: adjusting slurry, namely controlling the viscosity of the slurry to enable a sleeve to form an effective retaining wall on an upper rock layer, and reducing collapse when a drill hole penetrates through a goaf; and (3) drilling a bedrock, wherein if the condition that the washing liquid is completely leaked and does not return, the hole wall collapses, the drill falls and the like occurs in the affected zone when the drill hole is drilled to the overlying coal seam goaf, top leakage drilling is adopted.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (7)
1. A coal mining ground grouting structure comprises a ground (1), and is characterized in that the ground (1) comprises a fourth loose layer (11), a stable basement layer (12) and a coal bed (13), a first drilling hole (2) is formed in the fourth loose layer (11), an open casing (3) is arranged on the inner side of the first drilling hole (2), a first cement slurry fixing pipe (4) is arranged on the outer side wall of the open casing (3), and the first cement slurry fixing pipe (4) is tightly attached to the inner side wall of the first drilling hole (2);
the bottom of first drilling (2) just has seted up second drilling (5) in stabilizing basement rock stratum (12), is provided with two in second drilling (5) and opens sleeve pipe (6), and one opens sleeve pipe (3) and two and open sleeve pipe (6) and be the cavity setting, and the lateral wall of two sleeve pipes (6) is provided with the solid pipe of second grout (7), and the solid pipe of second grout (7) hugs closely in the inside wall of second drilling (5), and the bottom of second drilling (5) just has seted up third drilling (8) in coal seam (13).
2. A coal mining ground grouting structure according to claim 1, characterized in that a wooden plug (61) is arranged at the bottom of the double-opening sleeve (6), an expansion rubber (62) is arranged on the top of the wooden plug (61) and on the surface of the double-opening sleeve (6), a grouting hole (63) is arranged on the top of the expansion rubber (62) and on the surface of the double-opening sleeve (6), and the structure of the first-opening sleeve (3) is the same as that of the double-opening sleeve (6).
3. A coal mining ground grouting structure according to claim 1, characterized in that a fixing piece (9) is arranged at the top of the one opening sleeve (3), the fixing piece (9) is sleeved on the surface of the one opening sleeve (3), and the one opening sleeve (3) is in threaded connection with the fixing piece (9).
4. A coal mining ground grouting structure according to claim 1, characterized in that the inside wall of the first split sleeve (3) is provided with internal threads, the outside wall of the second split sleeve (6) is provided with external threads matched with the first split sleeve (3), and the second split sleeve (6) is in threaded connection with the first split sleeve (3).
5. A coal mining ground grouting process is characterized by comprising the following steps:
firstly, drilling a hole with a diameter of 130mm in a fourth series unconsolidated formation (11), drilling to a stable bedrock formation (12), then changing the diameter of 91mm to drill to a bedrock hard disk, and then logging;
secondly, reaming by using a phi 216mm reamer to form a first drilling hole (2), putting a phi 177.8mm open casing (3), and connecting the phi open casing (3) in a threaded manner;
thirdly, after the sleeve (3) is opened to the bottom, a drill rod with the diameter of 50mm is arranged at a position 0.3-0.5 m away from the bottom of the hole, and a cover is added on the upper opening of the sleeve (3);
fourthly, grouting a water hole through the bottom of the pipe, and totally closing the pipe from the bottom of the hole to the outside of the pipe by a full-hole grouting method to form a first cement mortar fixed pipe (4);
fifthly, after grouting, pressing the replacement water, releasing pressure after 6 hours, taking out the drilling tool, and cleaning the drill rod;
sixthly, after the water is condensed for 48 hours, the through holes are completely penetrated, and after 72 hours, the water stopping effect is checked;
seventhly, drilling to the coal seam by using the hole diameter of phi 91mm to form a third drilling hole (8), logging on the top plate 3m of the coal seam, reaming by using a phi 152mm area guide reaming bit to form a second drilling hole (5), descending a phi 127mm second open casing (6), connecting the second open casing (6) in a threaded manner, and fixing cement outside the pipe to form a second cement mortar fixed pipe (7).
6. A coal mining ground grouting process according to claim 5, characterized in that the lower parts of the first casing pipe (3) and the second casing pipe (6) are treated by wood plugs.
7. A coal mining ground grouting process according to claim 6, characterized in that the first sleeve (3) and the second sleeve (6) are externally wound with expanded rubber, and a grouting hole is reserved on the expanded rubber by 0.50 m.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112627753A (en) * | 2020-12-23 | 2021-04-09 | 中煤水文局集团有限公司 | Method for maintaining mud circulation in lost-return stratum |
| CN113464144A (en) * | 2021-06-16 | 2021-10-01 | 枣庄矿业(集团)有限责任公司 | Ground grouting process for treating water leakage and cracks of coal mine shaft in Lunan region |
| CN114517659A (en) * | 2022-02-22 | 2022-05-20 | 中煤地生态环境科技有限公司 | Method for grouting overlying strata abscission layer drill hole |
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