CN117888873A - Underground long-drilling directional fracturing local impact eliminating pre-control method - Google Patents
Underground long-drilling directional fracturing local impact eliminating pre-control method Download PDFInfo
- Publication number
- CN117888873A CN117888873A CN202410248969.4A CN202410248969A CN117888873A CN 117888873 A CN117888873 A CN 117888873A CN 202410248969 A CN202410248969 A CN 202410248969A CN 117888873 A CN117888873 A CN 117888873A
- Authority
- CN
- China
- Prior art keywords
- fracturing
- rock
- stratum
- coal seam
- drilling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005553 drilling Methods 0.000 title claims abstract description 30
- 238000000034 method Methods 0.000 title claims abstract description 22
- 239000003245 coal Substances 0.000 claims abstract description 57
- 239000011435 rock Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000004088 simulation Methods 0.000 claims abstract description 9
- 238000003379 elimination reaction Methods 0.000 claims abstract description 6
- 230000008030 elimination Effects 0.000 claims abstract description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 7
- 238000005755 formation reaction Methods 0.000 claims description 7
- 238000004364 calculation method Methods 0.000 claims description 4
- 238000011010 flushing procedure Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000005065 mining Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000002265 prevention Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The invention provides a local impact eliminating pre-control method for directional fracturing of underground long drilling, which comprises the following steps: core testing is carried out on the target coal bed, the top and bottom rock strata; establishing a numerical simulation model of target coal seam exploitation, and acquiring stress concentration characteristics of rock stratum within a range of 50m from a normal distance of the target coal seam; recording the normal distance between a layer of rock stratum with the highest stress concentration characteristic and a target coal seam and the inclination angle of the target coal seam; arranging fracturing holes in the stratum to be fractured at intervals along the stratum inclination direction; and (5) drilling and fracturing according to the positions of the fracturing holes. According to the method, the stress concentration characteristics of the coal bed are obtained through numerical simulation, a layer of rock stratum with the highest stress concentration coefficient is determined, the normal distance from the layer of rock stratum to the coal bed and the inclination angle of the coal bed are recorded, then fracturing holes are arranged in the rock stratum to be fractured at intervals according to a certain distance, finally drilling and fracturing processes are carried out according to the design, the elimination of rock burst in the coal bed is realized, and the safe production of mine work is ensured.
Description
Technical Field
The invention relates to the technical field of rock burst, in particular to a local impact eliminating pre-control method for directional fracturing of underground long drilling holes.
Background
The rock burst is a disaster that mine exploitation disturbance induces the instantaneous release of elastic energy accumulated in a coal rock body and causes the surrounding rock of a mining space to be destroyed or to vibrate strongly, so far, the main means of international rock burst prevention and control are local anti-impact technologies such as coal seam drilling pressure relief, blasting pressure relief, water injection, roof breaking and the like, and although a certain effect is achieved, the technical engineering quantity is huge, the cost is high, the artificial influence is large, the effect cannot be ensured, and the rock burst accident is continuously caused; the regional scour prevention means mainly adopts a mining liberation layer, and no effective regional scour prevention technology exists at present in mining areas without the liberation layer and difficult in mining the liberation layer.
Mine rock burst has received attention since the first occurrence because of its great destructive nature and the possible economic losses and even casualties that occur. On-site practice shows that on the basis of correctly knowing the occurrence mechanism of rock burst, the targeted implementation of rock burst prevention measures can often achieve better effects. The invention relates to a local impact eliminating pre-control technology for directional fracturing of underground long drilling, which is mainly used for reasonably arranging fracturing holes aiming at a steep coal seam structure so as to realize local elimination of rock burst.
Based on the method, how to eliminate the influence of rock burst on the mine, ensure safe production and become a technical problem to be solved urgently.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a local impact eliminating pre-control method for directional fracturing of a long underground drilling hole.
In order to achieve the above object, the present invention provides the following solutions:
a local impact eliminating pre-control method for directional fracturing of underground long drilling holes comprises the following steps:
core test is carried out on the target coal bed and the rock stratum of the top and bottom plates, and the mechanical parameters of the coal rock mass test piece are tested;
establishing a numerical simulation model of the target coal seam exploitation according to the working face exploitation geological conditions, and acquiring stress concentration characteristics of rock formations within a range of 50m from the normal direction of the target coal seam;
Recording the normal distance d of a layer of rock stratum with the highest stress concentration characteristic from the target coal seam and the inclination angle theta of the target coal seam;
The left side and the right side of the roadway drilling point in the vertical direction are respectively marked as A, B areas; wherein the included angle between the fracturing hole at the topmost part of the area A and the vertical direction is a 1, and the included angle between the fracturing hole at the bottommost part and the horizontal direction is a 2; the included angle between the fracturing hole at the topmost part of the B area and the horizontal direction is a 3, and the included angle between the fracturing hole at the bottommost part and the vertical direction is a 4;
Arranging fracturing holes in the stratum to be fractured at intervals of a certain distance L along the stratum inclination direction;
and drilling and fracturing according to the positions of the fracturing holes.
Preferably, the mechanical parameters include: compressive strength, tensile strength, cohesion, internal friction angle, and poisson's ratio.
Preferably, the calculation formulas of the included angles between the fracturing holes and the vertical direction and the horizontal direction are respectively as follows:
Preferably, the calculation formula of L is:
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The invention provides a local impact eliminating pre-control method for directional fracturing of underground long drilling, which comprises the following steps: core test is carried out on the target coal bed and the rock stratum of the top and bottom plates, and the mechanical parameters of the coal rock mass test piece are tested; establishing a numerical simulation model of the target coal seam exploitation according to the working face exploitation geological conditions, and acquiring stress concentration characteristics of rock formations within a range of 50m from the normal direction of the target coal seam; recording the normal distance d of a layer of rock stratum with the highest stress concentration characteristic from the target coal seam and the inclination angle theta of the target coal seam; the left side and the right side of the roadway drilling point in the vertical direction are respectively marked as A, B areas; wherein the included angle between the fracturing hole at the topmost part of the area A and the vertical direction is a 1, and the included angle between the fracturing hole at the bottommost part and the horizontal direction is a 2; the included angle between the fracturing hole at the topmost part of the B area and the horizontal direction is a 3, and the included angle between the fracturing hole at the bottommost part and the vertical direction is a 4; arranging fracturing holes in the stratum to be fractured at intervals of a certain distance L along the stratum inclination direction; and drilling and fracturing according to the positions of the fracturing holes. According to the method, based on geological conditions and related parameters of the fully mechanized caving face of the steeply inclined coal seam, the stress concentration characteristics of the coal seam are obtained through numerical simulation, a layer of rock stratum with the highest stress concentration coefficient is determined, the normal distance from the rock stratum to the coal seam and the inclination angle of the coal seam are recorded, then fracturing holes are arranged in the rock stratum to be fractured at intervals according to a certain distance, finally drilling and fracturing processes are carried out according to the design, the rock burst in the coal seam is eliminated, and the safe production of mine work is guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of directional fracturing of a long borehole downhole provided by an embodiment of the invention;
Reference numerals illustrate:
1-to-be-fractured rock stratum, 2-target coal seam and 3-fracturing hole.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a local impact eliminating pre-control technology for directional fracturing of underground long drilling, which can realize local elimination of rock burst in a coal rock mass.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a flowchart of a method provided by an embodiment of the present invention, and as shown in fig. 1, the present invention provides a method for locally pre-controlling the undersole long-drilling directional fracturing, including:
step 100: core test is carried out on the target coal bed and the rock stratum of the top and bottom plates, and the mechanical parameters of the coal rock mass test piece are tested;
step 200: establishing a numerical simulation model of the target coal seam exploitation according to the working face exploitation geological conditions, and acquiring stress concentration characteristics of rock formations within a range of 50m from the normal direction of the target coal seam;
Step 300: recording the normal distance d of a layer of rock stratum with the highest stress concentration characteristic from the target coal seam and the inclination angle theta of the target coal seam;
Step 400: the left side and the right side of the roadway drilling point in the vertical direction are respectively marked as A, B areas; wherein the included angle between the fracturing hole at the topmost part of the area A and the vertical direction is a 1, and the included angle between the fracturing hole at the bottommost part and the horizontal direction is a 2; the included angle between the fracturing hole at the topmost part of the B area and the horizontal direction is a 3, and the included angle between the fracturing hole at the bottommost part and the vertical direction is a 4;
Step 500: arranging fracturing holes in the stratum to be fractured at intervals of a certain distance L along the stratum inclination direction;
Step 600: and drilling and fracturing according to the positions of the fracturing holes.
The method for locally eliminating the long-drilled fracturing in the embodiment mainly comprises the following steps:
a. Core test is carried out on the target coal bed 2 and the rock layers of the top and bottom plates on site, and the mechanical parameters such as compressive strength, tensile strength, cohesive force, internal friction angle, poisson ratio and the like of a coal rock mass test piece are tested;
b. Establishing a numerical simulation model of coal seam mining according to the geological conditions of working face mining, and acquiring stress concentration characteristics of rock stratum within a range of 50m of a normal distance of a target coal seam 2;
c. taking a layer of rock stratum with the highest stress concentration coefficient, and recording the normal distance d between the rock stratum and the coal seam and the inclination angle theta of the target coal seam 2;
d. The left side and the right side of the roadway drilling point in the vertical direction are respectively marked as A, B areas;
e. Wherein the included angle a 1 between the fracturing hole 3 at the topmost part of the area A and the vertical direction and the included angle a 2 between the fracturing hole 3 at the bottommost part and the horizontal direction; the included angle a 3 between the topmost fracturing hole 3 and the horizontal direction in the region B and the included angle a 4 between the bottommost fracturing hole 3 and the vertical direction in the region B;
f. Arranging fracturing holes 3 in the stratum trend direction at intervals of a certain distance L in the stratum to be fractured 1;
g. and (5) drilling and fracturing according to the design.
Wherein theta is the inclination angle of the coal bed;
Further, in , L is the distance between two adjacent fracturing holes 3 in the formation dip direction in the formation 1 to be fractured.
The invention relates to a long-drilling fracturing local elimination process, which takes a mountain and western coal mine as an example:
① . Core testing is carried out on the target coal bed 2 and the rock layers of the top and bottom plates on site, and the mechanical parameters such as compressive strength, tensile strength, cohesive force, internal friction angle, poisson ratio and the like of the coal rock mass test piece are obtained through testing;
② . Establishing a numerical simulation model of coal seam mining according to the geological conditions of working face mining, and acquiring stress concentration characteristics of rock stratum within a range of 50m of a normal distance of a target coal seam 2;
③ . The normal distance d=50m between the layer of rock stratum with the highest stress concentration coefficient and the target coal seam 2 is measured, and the inclination angle theta=50deg.C of the target coal seam 2;
④ . The included angle between the fracturing hole 3 at the topmost part of the A area and the fracturing hole 3 at the bottommost part of the vertical direction is , the included angle between the fracturing hole 3 at the topmost part of the horizontal direction is/> B area, the included angle between the fracturing hole 3 at the bottommost part of the horizontal direction is/> , and the included angle between the fracturing hole 3 at the bottommost part of the horizontal direction is perpendicular to the fracturing hole
⑤ . At regular intervals in the rock formation 1 to be fractured
；
The fracturing apertures 3 are arranged in a formation-prone direction.
⑥ . And (5) drilling and fracturing according to the design.
The beneficial effects of the invention are as follows:
The long-drilling fracturing local impact eliminating process provided by the invention can effectively improve the impact ground pressure eliminating effect by reasonably segmenting the fracturing ports, avoid the danger caused by impact ground pressure, ensure that the mine production is safer and more reliable, and improve the economic benefit.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. The local impact eliminating pre-control method for directional fracturing of the underground long drilling hole is characterized by comprising the following steps of:
core test is carried out on the target coal bed and the rock stratum of the top and bottom plates, and the mechanical parameters of the coal rock mass test piece are tested;
establishing a numerical simulation model of the target coal seam exploitation according to the working face exploitation geological conditions, and acquiring stress concentration characteristics of rock formations within a range of 50m from the normal direction of the target coal seam;
Recording the normal distance d of a layer of rock stratum with the highest stress concentration characteristic from the target coal seam and the inclination angle theta of the target coal seam;
The left side and the right side of the roadway drilling point in the vertical direction are respectively marked as A, B areas; wherein the included angle between the fracturing hole at the topmost part of the area A and the vertical direction is a 1, and the included angle between the fracturing hole at the bottommost part and the horizontal direction is a 2; the included angle between the fracturing hole at the topmost part of the B area and the horizontal direction is a 3, and the included angle between the fracturing hole at the bottommost part and the vertical direction is a 4;
Arranging fracturing holes in the stratum to be fractured at intervals of a certain distance L along the stratum inclination direction;
and drilling and fracturing according to the positions of the fracturing holes.
2. The method of pre-control of local scout for directional fracturing of a long borehole downhole of claim 1, wherein the mechanical parameters include: compressive strength, tensile strength, cohesion, internal friction angle, and poisson's ratio.
3. The method for pre-controlling the local elimination of the directional fracturing of the underground long drilling hole according to claim 1, wherein the calculation formulas of the included angles of the fracturing hole and the vertical direction and the horizontal direction are respectively as follows:
4. The method for pre-controlling the local elimination of the flushing of the directional fracturing of the underground long drilling hole according to claim 1, wherein the calculation formula of L is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410248969.4A CN117888873A (en) | 2024-03-05 | 2024-03-05 | Underground long-drilling directional fracturing local impact eliminating pre-control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410248969.4A CN117888873A (en) | 2024-03-05 | 2024-03-05 | Underground long-drilling directional fracturing local impact eliminating pre-control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117888873A true CN117888873A (en) | 2024-04-16 |
Family
ID=90644991
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410248969.4A Pending CN117888873A (en) | 2024-03-05 | 2024-03-05 | Underground long-drilling directional fracturing local impact eliminating pre-control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117888873A (en) |
-
2024
- 2024-03-05 CN CN202410248969.4A patent/CN117888873A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112780340B (en) | Method for preventing rock burst in advance in underground coal mine area | |
| CN209761499U (en) | Roof hydraulic fracturing multi-parameter comprehensive monitoring system | |
| WO2023273091A1 (en) | Method for preventing and controlling rock bursts in development roadway group | |
| CN110685689B (en) | Large-deformation roadway pressure relief method under influence of mining stress | |
| CN110792419B (en) | Coal mine rock burst well up-down advance pre-control method | |
| CN107120137B (en) | A kind of coal roadway tunneling is along seat earth Deephole pre-splitting blasting pumping method | |
| CN112879011B (en) | Method for controlling height of water guide crack zone by hard overburden rock pre-cracking weakening under aquifer | |
| CN110067592B (en) | Roof gas cooperative control method based on hard roof ground fracturing | |
| CN113404535A (en) | Method for preventing rock burst by hydraulic fracturing of coal mine underground | |
| Huang et al. | Field investigation into directional hydraulic fracturing for hard roof in Tashan Coal Mine | |
| CN111859712A (en) | Ground advanced pre-control method for coal mine rock burst | |
| CN113404534B (en) | Method for preventing rock burst by staged fracturing of L-shaped ground horizontal well | |
| CN112160792B (en) | Staged hydraulic fracturing working method for underground hard top plate | |
| CN114876403A (en) | Mining high-position fracture space grouting repair method | |
| CN114320318B (en) | In-situ modification anti-scour method for coal mine roadway surrounding rock | |
| CN108374662A (en) | The conduction method of artesian water tomography is crossed in a kind of tunnel | |
| CN106677781A (en) | Pressure-relieving and permeability-increasing method for drilling exploitation of ultra-thin coal seam | |
| CN111677514B (en) | Roof weakening method | |
| CN111022050B (en) | Fully-closed blasting pressure relief and self-retained roadway method for grouting reconstruction of composite roof | |
| CN109779634B (en) | Method for determining position of fractured hard top plate of coal mine ground vertical well | |
| CN109826629B (en) | Coal mine ground fracturing hard roof process selection method | |
| CN111946343A (en) | Method for solving hard top plate collapse problem through ground vertical hole composite jet fracturing | |
| CN116771348A (en) | Method for reducing dynamic pressure influence of main roadway in last mining and optimizing stoping line coal pillar | |
| CN110985123A (en) | High-pressure hydraulic pre-cracking dangerous impact ore pressure crossheading roadway drilling arrangement method | |
| CN112780276A (en) | Fully-closed blasting pressure relief structure for grouting reconstruction of composite roof and self-retained roadway method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |