CN110985122A - High-pressure hydraulic presplitting open-off roadway drilling arrangement method - Google Patents

High-pressure hydraulic presplitting open-off roadway drilling arrangement method Download PDF

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Publication number
CN110985122A
CN110985122A CN201911304780.8A CN201911304780A CN110985122A CN 110985122 A CN110985122 A CN 110985122A CN 201911304780 A CN201911304780 A CN 201911304780A CN 110985122 A CN110985122 A CN 110985122A
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China
Prior art keywords
fracturing
drill
hole
holes
drilling
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Inventor
吴学明
黄克军
陈晨
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Shaanxi Binchangmengcun Mining Co Ltd
Shaanxi Coal and Chemical Technology Institute Co Ltd
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Shaanxi Binchangmengcun Mining Co Ltd
Shaanxi Coal and Chemical Technology Institute Co Ltd
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Priority to CN201911304780.8A priority Critical patent/CN110985122A/en
Publication of CN110985122A publication Critical patent/CN110985122A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21FSAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
    • E21F17/00Methods or devices for use in mines or tunnels, not covered elsewhere
    • 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
    • E21B21/00Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • 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
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/04Directional drilling
    • 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
    • E21B7/00Special methods or apparatus for drilling
    • E21B7/18Drilling by liquid or gas jets, with or without entrained pellets

Abstract

The invention discloses a high-pressure hydraulic pre-splitting open-off roadway drilling arrangement method, and particularly relates to a technical method for reasonably arranging drilling holes on a hard and difficult-to-collapse top plate of a coal seam goaf by determining drilling parameter design before fracturing on the basis of understanding geological construction conditions. By utilizing the method, on the basis of checking exploration geological data and knowing the structure and the thickness of the working face top plate, the design of drilling parameters before fracturing is determined, and the drilling holes are reasonably arranged on the hard and difficult-to-collapse top plate of the coal seam goaf, so that the integrity of the coal seam top plate is damaged, the hole sealing-fracturing effect of the hydraulic fracturing technology is improved, the goaf top plate can be timely collapsed in layers and in steps, the initial pressure and the periodic pressure step are shortened, and the purpose of reducing or eliminating the stoping damage of the hard top plate to the working face is achieved. Finally, the problem that the coal seam goaf is hard to collapse or the primary collapse area is large in the coal mining process is solved, and a favorable technical support is provided for hydraulic pre-splitting in the coal seam primary mining and primary caving work.

Description

High-pressure hydraulic presplitting open-off roadway drilling arrangement method
Technical Field
The invention belongs to the technical field of mining safety, relates to a hard and hard roof control technology, and particularly relates to a high-pressure hydraulic presplitting open-off roadway drilling arrangement method.
Background
In coal mining, the face goaf roof is typically managed using a total caving method. However, most of the coal mine goaf roofs in China cannot collapse in time along with the advance of the working face. For example, roof rock strata which has high rock strength, undeveloped joint fractures, large thickness, strong integrity and strong self-bearing capacity is suspended in a goaf in a large area after coal seam mining, does not collapse in a short period, and once collapses, has large area and height of one-time collapse and strong periodic pressure. Moreover, the initial pressing step pitch of the top plate is often large and can reach 40-50 m, even hundreds of meters, and obvious power phenomenon exists during pressing, so that supporting equipment is often damaged, and personal safety is endangered. The hard and difficult-to-collapse roof of the coal mine stope face is usually controlled by a high-pressure hydraulic prediction technology, but the effect is not obvious, and particularly under the stratum conditions of hard and compact roof of a coal rock stratum and good integrity, the fracturing wetting radius is small and a roof caving blind area exists. The arrangement of the drill holes is an important link of a high-pressure hydraulic prediction technology, and the fracturing effect is mainly determined by whether the arrangement of the drill holes before hole sealing and fracturing is reasonable or not.
For the top plate difficult to collapse, the top plate control technology is researched from the last century in China, and a top plate difficult to collapse control theory and a process method are formed. The hydraulic pre-splitting technology is used for controlling hard and difficult-to-collapse top plates of coal beds, and the control work is a hot direction of the current forced caving technology. The design and arrangement of fracturing drilling parameters are an important process before hole sealing and fracturing. On one hand, the hard roof of the coal seam can be effectively weakened, the integrity of the hard roof can be damaged, the strength and the integrity of the roof can be weakened, and pressure relief can be realized in a certain range around the drill hole; on the one hand, the influence range of the effective wet fracturing radius of hydraulic fracturing is enlarged, the primary top dead zone of a coal bed hard roof coal rock body hydraulic fracturing technology in a certain range is reduced, the primary pressure step and the periodic pressure step are shortened, and the roof hydraulic fracturing control effect is improved. The principle of the method is as follows: according to the mine construction geological conditions, the basic characteristics of the structure, the thickness and the lithology of a working face top plate are known, and then the fracturing times and the drilling parameters are determined, and a technical method for arranging the drill holes is carried out. The goaf roof can collapse in a layered and graded manner, the initial pressure and periodic pressure step distance is shortened, and the purpose of reducing or eliminating the stoping damage of the hard roof to the working face is achieved.
In recent years, the problem that mines in a certain mining area are hard and difficult to collapse is prominent. The burial depth of the main mining coal seam in the area 3-1 is 111.3m, the average thickness is 2.7m, the thickness change is small, the structure is simple, generally no gangue is contained, and only the top or the bottom of a local area contains a layer of gangue. The primary pressure step distance of the working surface of the coal seam of the 3-1 mining area is generally 40-80 m. When the working face of the main mining 3-1 coal seam is primarily mined, more than 90% of the working face needs to be forced to be jacked, otherwise, the top plate of the working face is easily suspended in a large area, and a strong power phenomenon is often accompanied when the working face is collapsed once. The problem of strong mine pressure power display in a mining area seriously restricts the normal production of a mine, threatens the personal safety of workers and hinders the construction of a high-yield and high-efficiency mine.
Aiming at the problem that a hard roof of a coal mine stope face is difficult to collapse, the hydraulic fracturing control roof technology is a common method for the mining area, but the drilling parameter design and arrangement mode before hole sealing and fracturing directly influences the drilling pressure relief effect and the hydraulic fracturing transformation effect. Therefore, there is a need for a reasonable drill hole placement method to destroy the integrity of the drill hole, weaken the strength and integrity of the roof, weaken the hard roof of the coal seam, and allow for pressure relief to a certain extent around the drill hole. Meanwhile, the primary caving blind area in a certain range of the coal-rock mass hydraulic fracturing technology of the hard top plate of the coal seam is reduced, the influence range of effective wet fracturing radius of hydraulic fracturing is enlarged, and the effect of the hydraulic fracturing control top plate is enhanced.
Disclosure of Invention
The invention aims to provide a high-pressure hydraulic pre-splitting open-off roadway drilling arrangement method to overcome the defects in the prior art. The purposes of destroying the integrity of the coal seam roof, improving the hole sealing-fracturing effect of the hydraulic fracturing technology, enabling the goaf roof to collapse in a layering and grading manner in time, shortening the initial pressure and period pressure step distance and reducing or eliminating the damage of the hard roof to the stoping of a working face are achieved. Finally, the safety of the initial mining and initial discharge of the coal seam is ensured, the dynamic phenomenon and disaster accidents of the mine are restrained, and the construction level of the high-quality mine is improved.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-pressure hydraulic pre-splitting open-off roadway drilling arrangement method comprises the following steps:
step 1: the open-hole fracture bore L, S is disposed: arranging an intraocular pressure splitting drill hole L and an intraocular pressure splitting drill hole S in the incision, wherein the intraocular pressure splitting drill hole L and the intraocular pressure splitting drill hole S are both arranged vertical to the coal wall;
step 1.1: perforating and grooving at the arrangement position of the cutting fracturing drill hole L, S;
step 1.2: after the hole cutting fracturing drill L, S is drilled and cut, water is injected, and the drill is flushed by static pressure water;
step 1.3: after the cutting fracturing drill L, S is flushed with water, the slotting effect is observed in real time on the cutting slot of the drill;
step 2: arranging the gate fracturing drill holes S: arranging crossheading fracturing drill holes S in a crossheading, wherein the included angle between the crossheading fracturing drill holes S and the coal wall is 20 degrees;
step 2.1: punching and grooving at the arrangement position of the crossheading fracturing drill holes S;
step 2.2: after punching and grooving the crossheading fracturing drill hole S, injecting water, and flushing the drill with static pressure water;
step 2.3: after the crossheading fracturing drill hole S is flushed by water, the slotting effect is observed in real time on the slotting of the drill hole;
and step 3: arranging a gate way end fracturing drill hole A: arranging a fracturing drill hole A at the end of the crossheading;
step 3.1: punching and grooving at the arrangement position of the fracturing drill hole A at the end of the crossheading;
step 3.2: after the crossheading end fracturing drill hole A is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 3.3: after the bedding-in end fracturing drill hole A is washed by water, the grooving effect of the drill hole grooving is observed in real time;
and 4, step 4: arranging a gate way end fracturing drill hole B: arranging a fracturing drill hole B at the end of the crossheading;
step 4.1: punching and grooving at the arrangement position of the fracturing drill holes B at the end of the crossheading;
step 4.2: after the crossheading end fracturing drill hole B is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 4.3: and after the bedding-in end fracturing drill hole B is washed by water, the grooving effect of the drill hole grooving is observed in real time.
Further, the drilling length of the eye cutting fracturing drilling hole L is 35m, the inclination angle is 15 degrees, 16 eye cutting fracturing drilling holes L are arranged in total, and are respectively L1-L16, and the advancing ruler is 560 m; the distance between the adjacent eye-cutting fracturing drill holes L1-L3 and L13-L15 is 16m, the distance between the adjacent eye-cutting fracturing drill holes L15-L16 is 15m, and the distance between the adjacent eye-cutting fracturing drill holes L3-L13 is 20 m.
Further, the drilling length of the eye incision drilling holes S is 25m, the inclination angle is 40 degrees, 16 eye incision drilling holes S are arranged in total, and the eye incision drilling holes S are respectively S1-S16 and have a footage of 400 m; the distance between the adjacent cutting fracturing drill holes S1-S3 and S13-S15 is 16m, the distance between the adjacent cutting fracturing drill holes S15-S16 is 15m, and the distance between the adjacent cutting fracturing drill holes S3-S13 is 20 m.
Further, the drill hole length of the gate way fracturing drill hole S is 25m, the inclination angle is 40 degrees, the included angle between the drill hole S and the coal wall is 20 degrees, 2 gate way fracturing drill holes S are arranged, the drill hole length is S17, the drill hole length is S18, and the drill hole length is 50 m; wherein the spacing between the gate frac borehole S17 and the open-off frac borehole S16 is 1m and the spacing between the gate frac borehole S18 and the open-off frac borehole S1 is 13 m.
Further, the drill hole length 46m of the fracturing drill hole A is 20 degrees, the drill hole length and the inclination angle are 6 degrees, and 2 fracturing drill holes A are arranged in the axial direction of the roadway and are respectively A1-A2.
Further, the drill hole length of the fracturing drill holes B is 37m, the inclination angle is 20 degrees, the fracturing drill holes B and the roadway are arranged at an included angle of 34 degrees, and 2 fracturing drill holes B are arranged, namely B1-B2.
Compared with the prior art, the invention has the following beneficial technical effects:
1. the invention relates to a method for weakening a coal seam roof of a hard and difficult-to-collapse roof mine efficiently and improving the hydraulic fracturing effect. According to the method, on the basis of understanding geological construction conditions, fracturing drilling parameters are determined, and drilling arrangement is carried out, so that the purposes of effectively weakening a hard top plate of a coal seam, damaging the integrity of the hard top plate, weakening the strength and the integrity of the top plate, relieving pressure in a certain range around a drill hole, increasing the influence range of effective wet fracturing radius of hydraulic fracturing, reducing a primary top-setting blind area in a certain range of a coal-rock body hydraulic fracturing technology of the hard top plate of the coal seam, shortening primary pressure and periodic pressure step distance, improving the roof control effect of hydraulic fracturing and reducing or eliminating the recovery damage of the hard top plate to a working face are achieved. The method has the advantages of simple structure of required instruments and equipment, safe operation, high efficiency and environmental protection, and provides scientific support for improving the hydraulic fracturing effect and forcibly controlling the top plate of the hard and difficult-to-collapse roof mine goaf.
2. The design of the invention follows the fundamental purpose of controlling the operation of the hard and difficult-to-collapse roof in the goaf of the coal seam of the coal mine, and is a safe, efficient, green and environment-friendly process technology.
3. The drilling hole arrangement method designed in the invention is reasonable in design, and does not influence the underground production work as far as possible.
4. As a process after repeated verification, the technology is simple to implement, and is suitable for controlling the work of releasing pressure of coal seam roofs of a plurality of mines, improving the hydraulic fracturing effect and the like on hard and difficult-to-collapse roofs.
5. The method is used for scientific fracturing effect evaluation and prediction in a laboratory, is successfully applied to a plurality of goaf hard and difficult-to-collapse roof mines, and powerfully verifies the rationality, the high efficiency and the stability of the method in the aspects of hydraulic pre-fracturing effect improvement and hard and difficult-to-collapse roof control.
Drawings
FIG. 1 is a schematic view of a hole cutting L fracture borehole;
FIG. 2 is a schematic view of an open-off cut, gate-side S fracture borehole;
FIG. 3 is a schematic view of a gate end A frac borehole arrangement;
FIG. 4 is a schematic view of a gate way end B frac borehole arrangement;
fig. 5 is a schematic diagram of a face hole cutting, gate opening L, S, A and B fracture drilling arrangement.
Fig. 6 is a schematic diagram of L, S, A and B frac drill drilling and slotting, wherein a shear hole L frac drill inclination angle α is 15 °, a shear hole and crossheading S frac drill inclination angle α is 40 °, a crossheading end a drill inclination angle α is 15 °, and a crossheading end B drill inclination angle α is 20 °;
FIG. 7 is a static pressure water flushing schematic of L, S, A and B fracture boreholes;
fig. 8 is a L, S, A and B fracture borehole peeking schematic.
Detailed Description
The invention is described in further detail below:
a high-pressure hydraulic pre-splitting open-off roadway drilling arrangement method comprises the following steps:
step 1: the open-hole fracture bore L, S is disposed: arranging an intraocular pressure splitting drill hole L and an intraocular pressure splitting drill hole S in the incision, wherein the intraocular pressure splitting drill hole L and the intraocular pressure splitting drill hole S are both arranged vertical to the coal wall; the drilling length of the cutting fracturing drilling holes L is 35m, the inclination angle is 15 degrees, 16 cutting fracturing drilling holes L are arranged in total, and the cutting fracturing drilling holes L are respectively L1-L16 and a feed ruler is 560 m; the distance between the adjacent eye-cutting fracturing drill holes L1-L3 and L13-L15 is 16m, the distance between the adjacent eye-cutting fracturing drill holes L15-L16 is 15m, and the distance between the adjacent eye-cutting fracturing drill holes L3-L13 is 20 m; the drilling length of the open-off fracturing drill holes S is 25m, the inclination angle is 40 degrees, 16 open-off fracturing drill holes S are arranged in total, and the lengths are respectively S1-S16 and the footage is 400 m; the distance between the adjacent eye-cutting fracturing drill holes S1-S3 and S13-S15 is 16m, the distance between the adjacent eye-cutting fracturing drill holes S15-S16 is 15m, and the distance between the adjacent eye-cutting fracturing drill holes S3-S13 is 20 m;
step 1.1: perforating and grooving at the arrangement position of the cutting fracturing drill hole L, S;
step 1.2: after the hole cutting fracturing drill L, S is drilled and cut, water is injected, and the drill is flushed by static pressure water;
step 1.3: after the cutting fracturing drill L, S is flushed with water, the slotting effect is observed in real time on the cutting slot of the drill;
step 2: arranging the gate fracturing drill holes S: arranging crossheading fracturing drill holes S in a crossheading, wherein the included angle between the crossheading fracturing drill holes S and the coal wall is 20 degrees; the drill hole length of the gate way fracturing drill hole S is 25m, the inclination angle is 40 degrees, the included angle between the gate way fracturing drill hole S and the coal wall is 20 degrees, 2 gate way fracturing drill holes S are arranged, the length is S17 and S18, and the footage is 50 m; wherein the distance between the crossheading fracturing drill hole S17 and the open-off fracturing drill hole S16 is 1m, and the distance between the crossheading fracturing drill hole S18 and the open-off fracturing drill hole S1 is 13 m;
step 2.1: punching and grooving at the arrangement position of the crossheading fracturing drill holes S;
step 2.2: after punching and grooving the crossheading fracturing drill hole S, injecting water, and flushing the drill with static pressure water;
step 2.3: after the crossheading fracturing drill hole S is flushed by water, the slotting effect is observed in real time on the slotting of the drill hole;
and step 3: arranging a gate way end fracturing drill hole A: arranging a fracturing drill hole A at the end of the crossheading; the drill hole length of the fracturing drill hole A is 46m, the inclination angle is 20 degrees, the fracturing drill hole A and the axial included angle of the roadway are 6 degrees, and 2 fracturing drill holes A are arranged in total and are respectively A1-A2;
step 3.1: punching and grooving at the arrangement position of the fracturing drill hole A at the end of the crossheading;
step 3.2: after the crossheading end fracturing drill hole A is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 3.3: after the bedding-in end fracturing drill hole A is washed by water, the grooving effect of the drill hole grooving is observed in real time;
and 4, step 4: arranging a gate way end fracturing drill hole B: arranging a fracturing drill hole B at the end of the crossheading; the drill hole length of the fracturing drill hole B is 37m, the inclination angle is 20 degrees, the fracturing drill hole B and the axial included angle of the roadway are 34 degrees, and 2 fracturing drill holes B are arranged in total and are respectively B1-B2;
step 4.1: punching and grooving at the arrangement position of the fracturing drill holes B at the end of the crossheading;
step 4.2: after the crossheading end fracturing drill hole B is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 4.3: and after the bedding-in end fracturing drill hole B is washed by water, the grooving effect of the drill hole grooving is observed in real time.
The following will further explain the specific implementation steps of the present invention with reference to fig. 1 to 8:
the invention designs a high-pressure hydraulic pre-fracturing initial mining initial discharge open-off cut tunnel drilling arrangement method, which is a method for determining fracturing drilling parameters and performing drilling arrangement on the basis of checking exploration geological data and knowing geological construction conditions such as the structure and thickness of a coal seam working face and a top plate, and the like, and achieves the purposes of destroying the integrity of hard top plate rocks, weakening the structure and the self strength of the top plate, increasing effective fracturing radius, improving large top pressure fracturing control blind area of high-pressure hydraulic fracturing and preventing collapse along with mining. The method is green, economic, safe and environment-friendly, and makes up the defect of unobvious high-pressure hydraulic fracturing effect.
The method determines fracturing drilling parameters on the basis of understanding geological construction conditions, and reasonably arranges drilling holes on a hard and difficult-to-collapse top plate of the coal seam goaf. The purposes of destroying the integrity of the coal seam roof, improving the hole sealing-fracturing effect of the hydraulic fracturing technology, enabling the goaf roof to collapse in a layering and grading manner in time, shortening the initial pressure and period pressure step distance and reducing or eliminating the damage of the hard roof to the stoping of a working face are achieved. Finally, the safety of the initial mining and initial discharge of the coal seam is ensured, the dynamic phenomenon and disaster accidents of the mine are restrained, and the construction level of the high-quality mine is improved. The device mainly comprises the following parts: MQT130 geological drilling rig, CP3Q-GM mining sight glass, phi 42-1000 drill rods, gauge protection reinforced drill bits, static pressure water inlet pipelines and mine water. The main operation process of the technology comprises the following steps: 1) arranging an incision fracturing drill L, S, mainly determining parameters of an incision fracturing drill L, S, and performing drilling arrangement, drilling and grooving of drill holes, static pressure water washing of drill holes, peeping of drilling effects and the like; 2) arranging the crossheading fracturing drill holes S, mainly determining parameters of the crossheading fracturing drill holes S, and performing drill hole arrangement, drill hole drilling and cutting, static pressure water washing drill holes, drill hole effect peeking and the like; 3) arranging the crossheading end fracturing drill holes A, mainly determining parameters of the fracturing drill holes A, and performing drilling arrangement, drilling and grooving of the drill holes, static pressure water washing drilling, peeping of drilling effects and the like; 4) arranging the fracturing drill holes B at the ends of the crossheading, mainly determining parameters of the fracturing drill holes B, and performing main procedures of drilling arrangement, drilling and grooving of the drill holes, static pressure water washing drilling, peeping drilling effect and the like. For example: a mine is a typical hard and difficult-to-collapse roof mine of a coal seam. The buried depth of the main mining 3-1 coal seam is 90.8-146.3 m, and the elevation of the bottom plate is 1153.9-1167.17 m. The average thickness of the 3-1 coal seam is 2.75m, the thickness variation range is small, the structure is simple, and the coal seam generally does not contain gangue and is a stable-deposit locally-recoverable medium-thickness coal seam. The 13101 working face is located in the south of the 3-1 coal auxiliary transportation main lane. The false roof of the working surface mainly comprises gray black carbon mudstone, the thickness of the working surface is 0.1m, and the hardness of a rock core is low; the immediate top is gray to light gray siltstone, which mainly comprises quartz and feldspar, the thickness is 1.86m, and the hardness of a core is medium; the old top is a gray-light gray coarse-grained sandstone interbedded layer with the thickness of 14.88m, and the main components are feldspar and quartz, and the secondary components are dark minerals and muscovite chips. The direct bottom plate is gray to dark gray siltstone, the thickness is 2.93m, the cementation is loose, and the hardness of the rock core is small. Faults, magma rocks and large fold structures are not found in the range of the working surface, the dip angle of the coal rock stratum is 1-3 degrees, the coal rock stratum inclines towards the west, and the coal bed moves to the north and south. The coal seam has small undulations in the direction of the dip. The compressive strength of the 3-1 coal direct top siltstone is 36.8Mpa under the dry condition, the compressive strength is 25.9Mpa under the saturated condition, and the tensile strength is 1.18 Mpa.
When the working face is initially mined, the top plate rock of the coal seam goaf has high strength, no joint crack development, large thickness, strong integrity and strong self-supporting capability. After the roof coal seam is mined, a large area is suspended in a goaf and is difficult to collapse, or after collapse, the area of one-time collapse is large, the height is large, and strong periodic pressure is applied. In addition, the initial pressing step pitch of the top plate is often larger, obvious power phenomenon exists during pressing, supporting equipment is often damaged, and personal safety is endangered. The hydraulic presplitting technology is used for controlling hard and hard roof of coal mine. Although the technology has good effect in controlling hard and difficult-to-collapse roofs of mines, a series of important work such as drilling arrangement, drilling and the like is needed before hole sealing and fracturing. Particularly, under the conditions that a coal seam and a roof are hard and compact and have good integrity, the arrangement method of the drill holes influences the fracturing effect of a hydraulic pre-fracturing technology and other hard and difficult-to-collapse roof control effects.
Therefore, aiming at the problems that the roof of the coal seam goaf in the mine is hard and difficult to collapse, the effective fracturing wetting radius of hydraulic fracturing is small, the top control blind area is large and the fracturing effect is not obvious, hydraulic fracturing test drilling is reasonably arranged, and hydraulic pre-fracturing hole sealing fracturing top control work is smoothly carried out, so that the problems to be solved are solved firstly. According to the method, on the basis of understanding geological construction conditions, fracturing drilling parameters are determined, and drilling holes are reasonably arranged, so that the integrity of a coal seam roof is damaged, the hole sealing-fracturing effect of a hydraulic fracturing technology is improved, a goaf roof can collapse in a layering and grading manner in time, the primary pressure and periodic pressure steps are shortened, the purpose of reducing or eliminating the stoping damage of a hard roof to a working face is achieved, and scientific support is provided for realizing control of the hard and difficult-to-collapse roof and on-site coal mine safety production.
The method specifically comprises the following steps:
the open-hole fracture bore L, S is disposed: and arranging the cut hole fracturing drill holes L (L1-L16, 16 in total) and the cut hole fracturing drill holes S (S1-S16, 16 in total) in the cut hole, and arranging the cut hole fracturing drill holes L and the cut hole fracturing drill holes S perpendicular to the coal wall.
Drilling design:
the length of each cut hole fracturing drill hole L is 35m, the inclination angle is 15 degrees, 16 cut hole fracturing drill holes L are arranged in total, and the drilling footage is 560 m. The spacing between L1-L3 and L13-L15 fracturing drill holes is 16m, the spacing between L15-L16 fracturing drill holes is 15m, and the spacing between L3-L13 fracturing drill holes is 20 m.
And (3) an incision fracture drill hole S with the length of 25m and the inclination angle of 40 degrees, and 16 fracture drill holes S are arranged in total and reach 400 m. The spacing between S1 fracturing drill holes to S3 fracturing drill holes to S13 fracturing drill holes to S15 fracturing drill holes is 16m, the spacing between S15 fracturing drill holes to S16 fracturing drill holes is 15m, and the spacing between S3 fracturing drill holes to S13 fracturing drill holes is 20 m.
First, the open hole fracture bore L, S is drilled into the slot. Firstly, checking an MQT130 geological drilling rig,Drill pipe, grooving bit gage strengthening bits, and connection issues for various pipes, gate valves, etc., and drill grooving at the location of the configuration of the open hole frac bore L, S.
Second, after the open-off fracturing bore L, S is drilled and the slot is drilled, water is injected and the bore is flushed with hydrostatic water.
And thirdly, after the cutting hole fracturing drill hole L, S is flushed by water, a CXK6 mining intrinsic safety type peeping instrument is adopted to perform drilling and cutting in real time to observe the slotting effect.
And connecting the equipment, the rod pieces and the pipelines in the first item, the second item and the third item strictly according to the connection requirements, and ensuring the complete sealing of the connection positions.
Arranging the gate fracturing drill holes S: and (2) arranging gate-way fracturing drill holes S (S17-S18 in total) at an included angle of 20 degrees with the coal wall in the gate-way.
Drilling design:
and 2 crossheading fracturing drill holes S are arranged, wherein the length of each drill hole is 25m, the inclination angle is 40 degrees, the included angle between each drill hole and the coal wall is 20 degrees, and the footage is 50 m. The spacing between the S17 and S16 fracturing drill holes is 1m, and the spacing between the S18 and S1 fracturing drill holes is 13 m.
Firstly, drilling and cutting a groove along a groove fracturing drill hole S. Firstly, checking an MQT130 geological drilling rig,The diameter-keeping strengthening drill bits of the drill rods and the grooving drill bits and the connection problems of pipelines, gate valves and the like are solved, and the drilling and grooving are carried out at the arrangement positions of the bedding fracturing drill holes S.
And secondly, after the drilling groove is drilled in the crossheading fracturing drill hole S, injecting water, and flushing the drill hole by adopting static pressure water.
And thirdly, after the crossheading fracturing drill hole S is flushed with water, adopting a CXK6 mining intrinsic safety type peeping instrument to drill a hole and cut a groove and observe the grooving effect in real time.
And connecting the equipment, the rod pieces and the pipelines in the first item, the second item and the third item strictly according to the connection requirements, and ensuring the complete sealing of the connection positions.
Arranging a gate way end fracturing drill hole A: and fracturing drill holes A (A1-A2, 2 in total) are arranged at the end of the gate way, and the total depth is 92 m.
Drilling design:
and 2 fracturing drill holes A are arranged, wherein the length of each drilling hole is 46m, the inclination angle is 20 degrees, and the included angle between each fracturing drill hole A and the axial direction of the roadway is 6 degrees, and the fracturing drill holes A1-A2 are arranged.
First, crossheading end fracturing drillThe hole a is drilled with a cutting groove. Firstly, checking an MQT130 geological drilling rig,And (3) the diameter-keeping strengthening drill bits of the drill rods and the grooving drill bits and the connection problems of pipelines, gate valves and the like are solved, and the drilling and grooving are carried out at the drilling arrangement position A.
And secondly, after the drilling and cutting groove is drilled in the crossheading end fracturing drill hole A, injecting water, and flushing the drill hole by adopting static pressure water.
And thirdly, after the crossheading end fracturing drill hole A is flushed with water, adopting a CXK6 mining intrinsic safety type peeping instrument to drill a hole and cut a groove and observe the grooving effect in real time.
And connecting the equipment, the rod pieces and the pipelines in the first item, the second item and the third item strictly according to the connection requirements, and ensuring the complete sealing of the connection positions.
Arranging a gate way end fracturing drill hole B: and fracturing drill holes B (B1-B2, 2 in total) are arranged at the ends of the gate way, and the total depth is 74 m.
Drilling design:
and 2 fracturing drill holes B are arranged, wherein the length of each drilling hole is 37m, the inclination angle is 20 degrees, and the included angle between each drilling hole and the axial direction of the roadway is 34 degrees, and the fracturing drill holes B1-B2 are arranged.
Firstly, drilling and cutting a groove along the fracturing drill hole B at the end of the groove. Firstly, checking an MQT130 geological drilling rig,And (4) the diameter-keeping strengthening drill bit of the drill rod and the grooving drill bit and the connection problem of pipelines, gate valves and the like are solved, and the drilling and grooving are carried out at the B drilling arrangement position.
And secondly, after the drilling groove is drilled in the crossheading end fracturing drill hole B, injecting water, and flushing the drill hole by adopting static pressure water.
And thirdly, after water is injected into the crossheading end fracturing drill hole B for flushing, adopting a CXK6 mining intrinsic safety type peeping instrument to perform drilling and grooving and observe the grooving effect in real time.
And connecting the equipment, the rod pieces and the pipelines in the first item, the second item and the third item strictly according to the connection requirements, and ensuring the complete sealing of the connection positions.
The invention relates to a method for weakening a coal seam roof of a hard and difficult-to-collapse roof mine efficiently and improving the hydraulic fracturing effect. According to the method, on the basis of understanding geological construction conditions, fracturing drilling parameters are determined, and drilling arrangement is carried out, so that the purposes of effectively weakening a hard top plate of a coal seam, damaging the integrity of the hard top plate, weakening the strength and the integrity of the top plate, relieving pressure in a certain range around a drill hole, increasing the influence range of effective wet fracturing radius of hydraulic fracturing, reducing a primary top-setting blind area in a certain range of a coal-rock body hydraulic fracturing technology of the hard top plate of the coal seam, shortening primary pressure and periodic pressure step distance, improving the roof control effect of hydraulic fracturing and reducing or eliminating the recovery damage of the hard top plate to a working face are achieved. The method has the advantages of simple structure of required instruments and equipment, safe operation, high efficiency and environmental protection, and provides scientific support for improving the hydraulic fracturing effect and forcibly controlling the top plate of the hard and difficult-to-collapse roof mine goaf. The design and operation method of the system obey the fundamental purpose of the control work of the hard and difficult-to-collapse roof of the goaf of the coal seam of the coal mine, and is a safe, efficient, green and environment-friendly process technology. The drilling hole arrangement method designed in the invention is reasonable in design, and does not influence the underground production work as far as possible. As a process after repeated verification, the technology is simple to implement, and is suitable for controlling the work of releasing pressure of coal seam roofs of a plurality of mines, improving the hydraulic fracturing effect and the like on hard and difficult-to-collapse roofs. The method is used for scientific fracturing effect evaluation and prediction in a laboratory, is successfully applied to a plurality of goaf hard and difficult-to-collapse roof mines, and powerfully verifies the rationality, the high efficiency and the stability of the method in the aspects of hydraulic pre-fracturing effect improvement and hard and difficult-to-collapse roof control.
The above description is only an embodiment of the present invention with better sampling effect, and is not intended to limit the present invention, and any simple modification, change and equivalent structural change made on the above embodiments according to the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims (6)

1. A high-pressure hydraulic pre-splitting open-off roadway drilling arrangement method is characterized by comprising the following steps:
step 1: the open-hole fracture bore L, S is disposed: arranging an intraocular pressure splitting drill hole L and an intraocular pressure splitting drill hole S in the incision, wherein the intraocular pressure splitting drill hole L and the intraocular pressure splitting drill hole S are both arranged vertical to the coal wall;
step 1.1: perforating and grooving at the arrangement position of the cutting fracturing drill hole L, S;
step 1.2: after the hole cutting fracturing drill L, S is drilled and cut, water is injected, and the drill is flushed by static pressure water;
step 1.3: after the cutting fracturing drill L, S is flushed with water, the slotting effect is observed in real time on the cutting slot of the drill;
step 2: arranging the gate fracturing drill holes S: arranging crossheading fracturing drill holes S in a crossheading, wherein the included angle between the crossheading fracturing drill holes S and the coal wall is 20 degrees;
step 2.1: punching and grooving at the arrangement position of the crossheading fracturing drill holes S;
step 2.2: after punching and grooving the crossheading fracturing drill hole S, injecting water, and flushing the drill with static pressure water;
step 2.3: after the crossheading fracturing drill hole S is flushed by water, the slotting effect is observed in real time on the slotting of the drill hole;
and step 3: arranging a gate way end fracturing drill hole A: arranging a fracturing drill hole A at the end of the crossheading;
step 3.1: punching and grooving at the arrangement position of the fracturing drill hole A at the end of the crossheading;
step 3.2: after the crossheading end fracturing drill hole A is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 3.3: after the bedding-in end fracturing drill hole A is washed by water, the grooving effect of the drill hole grooving is observed in real time;
and 4, step 4: arranging a gate way end fracturing drill hole B: arranging a fracturing drill hole B at the end of the crossheading;
step 4.1: punching and grooving at the arrangement position of the fracturing drill holes B at the end of the crossheading;
step 4.2: after the crossheading end fracturing drill hole B is punched and cut, water is injected, and the drill is flushed by static pressure water;
step 4.3: and after the bedding-in end fracturing drill hole B is washed by water, the grooving effect of the drill hole grooving is observed in real time.
2. The method for arranging the high-pressure hydraulic pre-splitting cut tunnel drilling holes according to claim 1, wherein the drilling hole length of the cut hole fracturing drilling holes L is 35m, the inclination angle is 15 degrees, 16 cut hole fracturing drilling holes L are arranged in total, and the cutting hole fracturing drilling holes L are respectively L1-L16 and are advanced by 560 m; the distance between the adjacent eye-cutting fracturing drill holes L1-L3 and L13-L15 is 16m, the distance between the adjacent eye-cutting fracturing drill holes L15-L16 is 15m, and the distance between the adjacent eye-cutting fracturing drill holes L3-L13 is 20 m.
3. The method for arranging the high-pressure hydraulic pre-splitting cut tunnel drilling holes according to claim 1, wherein the drill hole length of the cut hole fracturing drill hole S is 25m, the inclination angle is 40 degrees, 16 cut hole fracturing drill holes S are arranged in total, the lengths are respectively S1-S16, and the footage is 400 m; the distance between the adjacent cutting fracturing drill holes S1-S3 and S13-S15 is 16m, the distance between the adjacent cutting fracturing drill holes S15-S16 is 15m, and the distance between the adjacent cutting fracturing drill holes S3-S13 is 20 m.
4. The method for arranging the high-pressure hydraulic pre-splitting cut-hole roadway drill holes according to claim 1, wherein the drill hole length of the gate way fracturing drill hole S is 25m, the inclination angle is 40 degrees, the included angle with the coal wall is 20 degrees, 2 gate way fracturing drill holes S are arranged, and the drill holes are respectively S17 and S18, and the footage is 50 m; wherein the spacing between the gate frac borehole S17 and the open-off frac borehole S16 is 1m and the spacing between the gate frac borehole S18 and the open-off frac borehole S1 is 13 m.
5. The method for arranging the high-pressure hydraulic pre-splitting open-off roadway drill holes according to claim 1, wherein the drill hole length of the fracturing drill holes A is 46m, the inclination angle is 20 degrees, the fracture drill holes A are arranged at an included angle of 6 degrees with the axial direction of the roadway, and 2 fracturing drill holes A are arranged, namely A1-A2.
6. The method for arranging the high-pressure hydraulic pre-splitting open-off roadway drill holes according to claim 1, wherein the drill hole length of the fracturing drill holes B is 37m, the inclination angle is 20 degrees, the fracture drill holes B are arranged at an angle of 34 degrees with the axial direction of the roadway, and 2 fracturing drill holes B are arranged, namely B1-B2.
CN201911304780.8A 2019-12-17 2019-12-17 High-pressure hydraulic presplitting open-off roadway drilling arrangement method Pending CN110985122A (en)

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