CN110656941B - Design method and construction process of man-shaped ground well in coal mining area - Google Patents
Design method and construction process of man-shaped ground well in coal mining area Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 116
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- 238000010276 construction Methods 0.000 title claims abstract description 24
- 238000005553 drilling Methods 0.000 claims description 58
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- 239000012530 fluid Substances 0.000 claims description 4
- 239000002002 slurry Substances 0.000 claims description 4
- 239000002689 soil Substances 0.000 claims description 4
- 238000000605 extraction Methods 0.000 abstract description 21
- 230000009286 beneficial effect Effects 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 42
- 238000009933 burial Methods 0.000 description 8
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 7
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D1/00—Sinking shafts
- E21D1/03—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws
- E21D1/06—Sinking shafts mechanically, e.g. by loading shovels or loading buckets, scraping devices, conveying screws with shaft-boring cutters
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
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Abstract
The invention relates to a design method and a construction process of a man-shaped ground well in a coal mine mining area, belonging to the technical field of coal mine gas extraction, wherein the ground well comprises a vertical well section and a horizontal well section, and the vertical well section is communicated with the horizontal well section through an arc well section; the well position is positioned on the coal seam area and close to one side of the return airway, and the distance from the well position to the mining stopping line is a; the well depth of the vertical well section is positioned below the coal seam floor and above the fracture zone; arranging a lateral casing at the depth position of the vertical well section from the ground well mouth h 3; the horizontal well section is positioned on one side of the upper part of the fractured zone, which is close to the bent subsidence zone; the arc well section is communicated with the vertical well section through a lateral casing; during construction, a vertical well section is constructed firstly, then an arc well section is constructed, and finally a horizontal well section is constructed. The invention realizes the purpose of arranging two well types of the L-shaped ground well and the vertical well in a single well field, improves the extraction rate of gas resources, can effectively ensure that the gas concentration of an upper corner and a return airway of a coal face is not over-limit, and is beneficial to the centralized management of gas extraction.
Description
Technical Field
The invention belongs to the technical field of coal mine gas extraction, and relates to a design method and a construction process of a man-shaped ground well in a coal mine mining area, in particular to a method for treating gas in the ground well in the mining area.
Background
Coal bed gas is commonly referred to as "gas" and comprises CH4 (methane) as a main component, unconventional natural gas which is associated with coal and stored in a coal bed in an adsorbed state, and methane as a main component. Is a good fuel. When the air concentration of the coal bed gas reaches a certain value, the coal bed gas can explode when exposed to fire, which is the root cause of coal mine gas explosion accidents. Therefore, the treatment of coal bed gas is an important means for reducing accidents. The coal bed gas is directly discharged into the atmosphere and has strong destructiveness to the atmosphere. Therefore, if coal bed gas is mined before coal mining, the gas explosion rate of the coal mine can be effectively reduced, and the mined coal bed gas can be used as clean energy for industry and agriculture.
Coal bed gas is generally mined in two ways: firstly, drilling and exploiting on the ground; and secondly, the underground gas pumping system pumps out the underground gas, the coal bed gas and the pumped gas which are mined by ground drilling can be utilized, the quantity of the gas exhausted by air can be greatly reduced after the ground mining and the pumping, the ventilation requirement of a coal mine is reduced, and the safety production condition of miners is improved. In actual production, the construction of the vertical well in the mining area has the disadvantages of small extraction range, more construction wells, large investment and strict connection requirement, and the high-efficiency extraction of the coal bed gas cannot be realized.
The ground well in the prior art comprises a ground vertical well and an L-shaped ground well, however, the gas area extracted by the ground vertical well is small, and the L-shaped ground well has a blank area of the arc-shaped well section for extracting gas.
Disclosure of Invention
In view of the above, the present application aims to provide a design method and a construction process for a man-shaped ground well in a coal mine mining area, and by designing the man-shaped ground well, the purpose of arranging two types of L-shaped ground wells and vertical wells in a single well site is achieved, the extraction rate of gas resources is improved, and the centralized management of gas extraction is facilitated.
In order to achieve the aim, the invention provides a design method of a man-shaped ground well in a coal mine mining area, wherein the ground well comprises a vertical well section and a horizontal well section, and the vertical well section is communicated with the horizontal well section through an arc well section; the well position is positioned on the coal seam area and close to one side of the return airway, and the distance from the stopping production line is a; the well depth of the vertical well section is positioned below the coal seam floor and above the fracture zone; arranging a lateral casing at the depth position of the vertical well section from a ground well mouth h 3; the horizontal well section is positioned on one side of the upper part of the fractured zone, which is close to the bent subsidence zone; the arc well section is communicated with the vertical well section through a lateral casing.
Optionally, the distance a of the well location from the production stopping line is 150m to 200 m.
Optionally, the distance b of the well location from the return airway is 1/5 coalface inclination length.
Optionally, the well position is located at the intersection of the bottom of a key overlying rock layer and an overlying rock fracture elliptic cast zone, wherein the key layer refers to a rock layer with the overlying rock strength of more than or equal to 60MPa, the rigidity of more than or equal to 25Gpa and the thickness of more than or equal to 6 m.
Optionally, the actual coal seam burial depth parameter obtained by drilling the vertical well section is used for correcting the horizon of the horizontal well section, and when the actual coal seam burial depth is larger than the predicted coal seam depth, the horizon of the horizontal well section moves downwards.
Optionally, the actual coal seam thickness parameter obtained by drilling the vertical well section is used for correcting the horizon of the horizontal well section, and when the actual coal seam thickness is larger than the theoretical coal seam thickness, the horizon of the horizontal well section moves upwards.
Optionally, the distribution parameters of the strength, rigidity and thickness of the actual rock formation above the coal seam obtained by drilling the vertical well section are used for correcting the horizon of the horizontal well section, and when the strength of the actual rock formation is greater than 150MPa, the rigidity is greater than 100GPa and the thickness is greater than 10m, the horizon of the horizontal well section moves upwards.
Optionally, the distance h6 between the well depth of the vertical well section and the lower part of the coal seam is 2-3 times of the thickness of the coal seam.
The invention also provides a construction process of the man-shaped ground well in the coal mining area, wherein the vertical well section is drilled firstly, then the arc-shaped well section is drilled, and then the horizontal well section is drilled, and the construction process comprises the following steps:
s1 determining the well position: determining a well position according to a stoping line, a return airway and a overburden layer;
s2 drilling a vertical well section:
s2.1, opening: drilling to a position below a surface soil layer, and then drilling a casing for well cementation;
s2.2, opening II:
s2.21 drilling to a position above the bottom of the overlying strata bent subsidence zone;
s2.22, cementing the well by using a second casing pipe, and arranging a lateral casing pipe at the depth h3 away from the wellhead;
s2.3, three openings:
s2.31 drilling to a position above a fracture zone below a coal seam floor;
s2.32, laying a three-opening sieve tube, wherein the three-opening sieve tube is hung on the inner wall of the two-opening sleeve and is positioned above the coal seam top plate;
s3 drilling an arc-shaped well section:
s3.1, installing an expansion rubber rod at the lower part of the lateral casing to prevent subsequent drilling fluid and well cementation cement slurry from entering the bottom of the vertical well section;
s3.2, drilling an arc-shaped well section, and cementing a casing pipe of the lower arc-shaped section;
s4 drilling a horizontal well section:
s4.1, drilling a horizontal well section and a screen pipe of the lower horizontal section;
s4.2, drilling through the expansion rubber rod in the vertical well section by the lower drill bit.
Optionally, the horizontal well section is constructed in a monoclinic downward mode, and the inclination angle is 1-2 degrees.
The invention has the beneficial effects that:
1. the invention realizes the purpose that a single well field finishes two well types of the L-shaped ground well in the mining area and the vertical ground well in the mining area, and is beneficial to reducing the drilling cost; especially for mountainous terrain, the cost reduction is more remarkable.
2. The vertical well can solve the blank area of gas extraction of the L-shaped arc well section and solve the safety problem caused by the over-limit of the gas at the upper corner of the coal face.
3. According to the invention, the buried depth of the coal bed, the thickness of the coal bed and the rock stratum condition above the coal bed can be mastered through the ground vertical well, and the horizontal well section of the L-shaped ground well in the mining area can be more accurately constructed.
4. The invention integrates the advantages of the L-shaped ground well of the mining area and the ground vertical well of the mining area, not only effectively ensures that the gas concentration of the upper corner of the coal face and the return airway does not exceed the limit, but also effectively improves the gas resource extraction rate, and is beneficial to the centralized management of gas extraction.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a well location for a "man" type surface well;
FIG. 2 is a schematic view of the well depth of a "man" type surface well;
FIG. 3 is a schematic view of a vertical well section of a "man" type surface well.
Reference numerals: the well comprises a vertical well section 1, an arc well section 2, a horizontal well section 3, a first casing 4, a second casing 5, a lateral casing 6, a well cementation cement sheath 7, a hanger 8 and a three-opening sieve tube 9.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
The invention provides a design method and a construction process of a man-shaped ground well in a coal mining area, which can be used for solving the problem of gas overrun of a coal mining working face, an upper corner and a return airway. The main contents are as follows:
(1) determining the well position of a human-shaped ground well in a mining area;
(2) determining the construction sequence of the human-shaped ground well in the mining area;
(3) designing technology of a vertical well section 1 of a man-shaped ground well in a mining area;
(4) the design technology of an arc well section 2 and a horizontal well section 3 of a man-shaped ground well in a mining area;
therefore, a complete design method of the human-shaped ground well in the mining area can be formed, and the safety of the gas on the coal face and the gas resource in the mined-out area can be effectively guaranteed.
The invention gives full play to the advantages of the L-shaped ground well in the mining area and the ground vertical well in the mining area, can solve the blank space of gas extraction of the arc-shaped well section in the L-shaped ground well by designing the vertical well, the extraction area of the vertical well section 1 in the man-shaped ground well is shown in figure 2, and the buried depth of the coal seam and the rock stratum condition above the coal seam can be mastered by drilling the vertical well section 1, thereby being beneficial to accurately determining the horizontal well section 3 of the construction mining area. The man-shaped ground well in the mining area expands the gas extraction range of one well site in the prior art, improves the gas resource extraction rate, and is beneficial to centralized management of gas extraction.
The design method of the invention is as follows:
(1) determining the well position of a human-shaped ground well in a mining area:
according to the well position selection characteristics of the vertical well in the mining area and the L-shaped ground well in the mining area, the well position of the ' man ' -shaped ' ground well in the mining area is preferably as shown in figure 1.
Firstly, a man-shaped ground well spacing mining stopping line a in a mining area is required to be 150-200 m, and the gas safety of a coal face is guaranteed when the normal stoping of the coal face is finished;
secondly, the well position of the human-shaped ground well in the mining area is required to be close to the side of the return airway (the return airway is higher than the air intake airway in altitude), and is positioned at the bottom of a certain key layer of the overlying strata (the stratum with higher overlying strata strength and rigidity is positioned in a fractured zone in the 'vertical three zones' of the overlying strata) and the intersecting part of the fractured elliptical cast zone of the overlying strata. If no significant critical layer is present, the general b is taken to be about 1/5 coal face inclination length.
(2) Construction sequence of the man-shaped ground well in the mining area:
constructing a vertical well section 1 of a man-shaped ground well in a mining area;
construction of arc well section 2 of 'man' shaped ground well in mining area
Constructing a horizontal well section 3 of the man-shaped ground well in the mining area;
(3) the design technology of the vertical well section 1 of the human-shaped ground well in the mining area comprises the following steps:
opening one position 10m below the surface soil layer, and opening a sleeve 4 for well cementation next.
Secondly, normally drilling, wherein the drilling is carried out 5-10 m above the bottom of the bent subsidence zone of the overlying strata, when a second sleeve 5 is placed, a lateral sleeve 6 easy to laterally drill through is arranged at a designed deflecting point h3 (the construction starting point of the arc-shaped well section 2), and two ends of the lateral sleeve 6 are connected with the second sleeve 5; the depth position of h3 is determined by the combination of the lithology of the overlying strata (preferably medium hard strata) and the deflecting requirement, and the depth position of h3 is generally above the fractured zone and is positioned in the bottom strata of the bending subsidence zone. The length of the lateral casing 6 is h7, and the requirements of construction of a deflecting drill rod, a drilling tool and the like need to be met. The strength and the rigidity of the lateral sleeve 6 are similar to those of the double-opening sleeve 5, and the approximation rate is not less than 95%.
Thirdly, three openings are drilled above a crack zone at the bottom of the coal seam, the distance h6 from the bottom of the coal seam is 2-3 times of the thickness of the coal seam, the three openings of the sieve tube 9 are completed by adopting a sieve tube and are suspended on the inner wall of the two openings of the sieve tube 5 through a hanger 8, and the distance h5 from the bottom of the sieve tube to the top plate of the coal seam is 0.5m, as shown in figure 3. And drilling to the coal seam to obtain parameters such as thickness, depth and the like of the coal seam on site, and providing site basis for the horizontal well section 3.
(4) The design technology of the arc well section 2 and the horizontal well section 3 of the human-shaped ground well in the mining area comprises the following steps:
firstly, determining the height of a horizontal well section 3: comprehensively determining according to the coal seam burial depth, the overlying strata lithology, the height of a fracture zone and the like, and preferably selecting a region with 6-8 times of coal seam thickness and large overlying strata lithology strength, rigidity and thickness;
secondly, designing an arc-shaped well section 2 according to the position of a lateral sleeve 6 of a vertical well section 1 of the man-shaped ground well in the mining area and the initial position of a horizontal well section 3, wherein the arc-shaped well section 2 is required to meet normal deflecting construction requirements and is convenient to install an arc-shaped section sleeve;
installing an expansion rubber rod at the lower part of a lateral casing 6 of a vertical well section 1 of a human-shaped ground well in the mining area before constructing an arc-shaped well section 2 of an L-shaped well section in the mining area, and preventing drilling fluid, well cementation cement slurry and the like from filling into the vertical well section to influence gas extraction when the arc-shaped well section 2 drills;
fourthly, after the well cementation of the arc-shaped well section 2 of the L-shaped well section of the mining area is completed, the well drilling construction of the horizontal well section 3 is carried out, in order to ensure the gas extraction effect, the horizontal well section 3 is constructed in a single inclined downward mode, and the inclination angle is 1-2 degrees; after construction, a sieve tube is arranged;
and fifthly, drilling through the expansion rubber rod in the vertical well section by a lower drill bit to the bottom of the well.
And the first casing 4, the second casing 5 and the arc-shaped casing are provided with well cementation cement casings 7.
Example 1
A design method of a man-shaped ground well in a coal mining area comprises the steps that the ground well comprises a vertical well section 1 and a horizontal well section 3, and the vertical well section 1 and the horizontal well section 3 are communicated through an arc well section 2; determining a well position according to a stopping and mining line, an air return tunnel and a overburden layer, wherein the distance a between the well position and the stopping and mining line is 150-200 m, the well position is close to one side of the air return tunnel, the well position is positioned at the intersection of the bottom of a overburden key layer and an overburden fracture elliptical cast zone or the distance b between the bottom of the overburden key layer and the overburden fracture elliptical cast zone is 1/5 coal face inclination length, the key layer refers to a rock stratum with overburden strength being more than or equal to 60MPa, rigidity being more than or equal to 25Gpa and thickness being more than or equal to 6 m; the well depth of the vertical well section 1 is positioned below the coal seam floor and above the fissure zone, and a lateral casing 6 which is easy to laterally drill through is arranged at the depth position of the vertical well section from a ground well mouth h 3; the actual coal seam burial depth, the coal seam thickness and the rock stratum condition above the coal seam are mastered through drilling of the vertical well section 1, a basis is provided for determining the position of the horizontal well section 3, and the horizontal well section 3 is located on the upper portion of a fracture zone above the coal seam; determining the initial position of the horizontal well section 3 according to the coal seam burial depth, the overburden lithology and the fracture zone height, and designing the arc-shaped well section 2 according to the position of the lateral casing 6 and the initial position of the horizontal well section 3; the curved well section 2 communicates with the vertical well section 1 via a lateral casing 6.
The horizontal well section 3 is positioned at the upper part of the fracture zone and is a rock stratum with larger thickness, strength and rigidity (namely the rock stratum has the strength of 40-150 MPa, the rock stratum rigidity of 15-100 GPa and the rock stratum thickness of more than or equal to 5 m).
The actual coal seam burial depth parameter, the theoretical coal seam thickness and the distribution parameters of the actual rock stratum strength, rigidity and thickness obtained by drilling the vertical well section 1 are used for correcting the layer position of the horizontal well section 3, and when the actual coal seam burial depth is larger than the theoretical coal seam burial depth, the layer position of the horizontal well section 3 moves downwards; when the actual coal seam thickness is larger than the theoretical coal seam thickness, the horizon of the horizontal well section 3 moves upwards; when the actual rock formation has the strength of more than 150MPa, the rigidity of more than 100GPa and the thickness of more than 10m, namely the rock formation is a difficult-to-drill rock formation, the horizon of the horizontal well section 3 moves upwards.
Further, the distance h6 between the well depth of the vertical well section and the lower part of the coal seam is 2-3 times of the thickness of the coal seam.
Example 2
A construction process of a man-shaped ground well in a coal mining area comprises the following steps of firstly drilling a vertical well section 1, then drilling an arc-shaped well section 2, and then drilling a horizontal well section 3:
s1 determining the well position: and determining a well position according to the stoping line, the return airway and the overlying strata layer, wherein the well position is positioned at the intersection of the bottom of the key overlying strata layer and the overlying strata fracture elliptic throw zone and is positioned in an area which is 150-200 m away from the stoping line a.
S2 drilling vertical interval 1:
s2.1, opening: drilling to 10m below a surface soil layer, and then drilling a sleeve 4 for well cementation;
s2.2, opening II:
s2.21 drilling until the depth is 5-10 m above the bottom of the overlying strata bent subsidence zone;
s2.22, cementing with a second casing 5, and arranging a lateral casing 6 which is easy to laterally drill through at a depth position h3 away from a wellhead;
s2.3, three openings:
s2.31 drilling to a position above a fracture zone below a coal seam floor;
s2.32, three-opening sieve tubes 9 are arranged, the three-opening sieve tubes 9 are hung on the inner wall of the two-opening sleeve 5 and are positioned above the coal seam roof, and the distance between the bottoms of the three-opening sieve tubes 9 and the coal seam roof h5 is 0.5 m;
s3 drilling arc section 2:
s3.1, installing an expansion rubber rod at the lower part of the lateral casing 6 to prevent subsequent drilling fluid and well cementation cement slurry from entering the bottom of the vertical well section 1;
s3.2, drilling an arc-shaped well section 2, and cementing a casing pipe of the lower arc-shaped section;
s4 drilling horizontal wellbore section 3:
s4.1, drilling a horizontal well section 3 and a lower horizontal screen pipe;
s4.2, drilling through the expansion rubber rod in the vertical well section 1 by the lower drill bit.
Furthermore, the horizontal coordinate of the well position is at the position of 150-200 m away from the stoping line a in the coal seam area, and the inclined length of the coal face of 1/5 away from the return airway b in the coal seam area is the vertical coordinate of the well position.
Further, the horizontal well section 3 is constructed in a monocline downward mode, and the inclination angle is 1-2 degrees.
Further, the thickness of the coal seam, the depth of the coal seam and the condition of the rock layer above the coal seam, which are obtained in the drilling process of the vertical well section 1, are used for determining the position of the horizontal well section 3.
After the method is implemented, coal is mined on the equal coal mining working face, and the horizontal well section 1 is extracted through negative pressure; when the coal face is mined to the arc-shaped well section 2, the vertical well section 1 plays a role, and gas is extracted through the vertical well section 1, so that the safety of a coal mining area is ensured.
The invention integrates the advantages of gas extraction of the ground vertical well and the L-shaped ground well in the mining area, expands the application range of the gas extraction technology of the ground well, and provides technical support for popularization and professional service of the gas extraction technology of the ground well in the mining area.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (10)
1. A design method of a man-shaped ground well in a coal mining area is characterized by comprising the following steps: the ground well comprises a vertical well section and a horizontal well section, and the vertical well section is communicated with the horizontal well section through an arc well section;
the well position is positioned on the coal seam area and close to one side of the return airway, and the distance from the stopping production line is a;
the well depth of the vertical well section is positioned below the coal seam floor and above the fracture zone;
arranging a lateral casing at a depth h3 from the vertical well section to a ground well mouth, and comprehensively determining h3 according to the lithology of overlying strata and the deflecting requirement;
the horizontal well section is positioned on one side of the upper part of the fractured zone, which is close to the bent subsidence zone;
the arc well section is communicated with the vertical well section through a lateral casing;
the horizontal well section and the vertical well section which is positioned between the lower edge of the overlying strata bent subsidence zone and the coal seam top plate are arranged by adopting a sieve tube;
during construction, the vertical well section is drilled first, the arc well section is drilled, and the horizontal well section is drilled later.
2. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: the distance a between the well location and the production stopping line is 150-200 m.
3. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: the distance b from the well to the return airway is 1/5 coal face inclination length.
4. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: the well position is located at the intersection of the bottom of a key overlying rock layer and an overlying rock fracture elliptic cast zone, wherein the key layer refers to a rock layer with the overlying rock strength of more than or equal to 60MPa, the rigidity of more than or equal to 25GPa and the thickness of more than or equal to 6 m.
5. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: and when the actual coal seam buried depth is greater than the predicted coal seam depth, the horizon of the horizontal well section moves downwards.
6. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: and the actual coal seam thickness parameter obtained by drilling the vertical well section is used for correcting the layer position of the horizontal well section, and when the actual coal seam thickness is larger than the theoretical coal seam thickness, the layer position of the horizontal well section moves upwards.
7. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: the distribution parameters of the actual rock stratum strength, rigidity and thickness above the coal bed are obtained through drilling of the vertical well section and are used for correcting the layer position of the horizontal well section, and when the actual rock stratum strength is larger than 150MPa, the rigidity is larger than 100GPa and the thickness is larger than 10m, the layer position of the horizontal well section moves upwards.
8. The design method of the human-shaped ground well in the coal mining area according to claim 1, characterized in that: and the distance h6 between the well depth of the vertical well section and the lower part of the coal seam is 2-3 times of the thickness of the coal seam.
9. A construction process of a man-shaped ground well in a coal mining area is characterized in that: firstly, drilling a vertical well section, then drilling an arc well section, and then drilling a horizontal well section, wherein the method comprises the following steps:
s1 determining the well position: determining a well position according to a stoping line, a return airway and a overburden layer;
s2 drilling a vertical well section:
s2.1, opening: drilling to a position below a surface soil layer, and then drilling a casing for well cementation;
s2.2, opening II:
s2.21 drilling to a position above the bottom of the overlying strata bent subsidence zone;
s2.22, cementing the well by using a second casing pipe, and arranging a lateral casing pipe at the depth h3 away from the wellhead;
s2.3, three openings:
s2.31 drilling to a position above a fracture zone below a coal seam floor;
s2.32, laying a three-opening sieve tube, wherein the three-opening sieve tube is hung on the inner wall of the two-opening sleeve and is positioned above the coal seam top plate;
s3 drilling an arc-shaped well section:
s3.1, installing an expansion rubber rod at the lower part of the lateral casing to prevent subsequent drilling fluid and well cementation cement slurry from entering the bottom of the vertical well section;
s3.2, drilling an arc-shaped well section, and cementing a casing pipe of the lower arc-shaped section;
s4 drilling a horizontal well section:
s4.1, drilling a horizontal well section and a screen pipe of the lower horizontal section;
s4.2, drilling through the expansion rubber rod in the vertical well section by the lower drill bit.
10. The construction process of the human-shaped ground well in the coal mining area according to claim 9, characterized in that: the horizontal well section is constructed in a single inclined downward mode, and the inclination angle is 1-2 degrees.
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Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4028596A1 (en) * | 1990-09-08 | 1992-03-12 | Westfalia Becorit Ind Tech | Equipment for sinking shafts - uses widening tool fixed to supporting and guiding tube which is inserted in pilot hole |
| CN101718173A (en) * | 2009-12-25 | 2010-06-02 | 刘文西 | Petroleum multilateral well solid expandable tubular (SET) bifurcation structure and construction method |
| CN102080530A (en) * | 2010-12-22 | 2011-06-01 | 北京奥瑞安能源技术开发有限公司 | Method for constructing horizontal coal bed gas well and vertical drainage and mining well |
| CN102086774A (en) * | 2011-01-17 | 2011-06-08 | 中联煤层气国家工程研究中心有限责任公司 | Drainage method of gas in coal bed |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
| CN105927191A (en) * | 2016-06-21 | 2016-09-07 | 太原理工大学 | Method for combined mining of coal seam gas of cutter column type old goaf and lower coal seam |
| CN106089291A (en) * | 2016-06-21 | 2016-11-09 | 太原理工大学 | A kind of collaborative extraction is caving the old dead zone of formula and the method for lower coal seam coal bed gas |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN207048741U (en) * | 2017-07-31 | 2018-02-27 | 山西晋城无烟煤矿业集团有限责任公司 | The drilled well bore structure of gas surface well in a kind of pre- extraction dead zone the following group coal |
| CN107916953A (en) * | 2017-11-24 | 2018-04-17 | 陕西省煤层气开发利用有限公司 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
| CN109403943A (en) * | 2018-09-26 | 2019-03-01 | 中国石油天然气股份有限公司 | Staged fracturing method for 3-inch half sidetracking horizontal well |
-
2019
- 2019-10-31 CN CN201911055847.9A patent/CN110656941B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4028596A1 (en) * | 1990-09-08 | 1992-03-12 | Westfalia Becorit Ind Tech | Equipment for sinking shafts - uses widening tool fixed to supporting and guiding tube which is inserted in pilot hole |
| CN101718173A (en) * | 2009-12-25 | 2010-06-02 | 刘文西 | Petroleum multilateral well solid expandable tubular (SET) bifurcation structure and construction method |
| CN102080530A (en) * | 2010-12-22 | 2011-06-01 | 北京奥瑞安能源技术开发有限公司 | Method for constructing horizontal coal bed gas well and vertical drainage and mining well |
| CN102086774A (en) * | 2011-01-17 | 2011-06-08 | 中联煤层气国家工程研究中心有限责任公司 | Drainage method of gas in coal bed |
| CN105840146A (en) * | 2016-04-14 | 2016-08-10 | 中国石油大学(华东) | Method for self-circulation exploitation of geothermal energy of hot dry rock with multilateral well and volume fracturing technologies |
| CN105927191A (en) * | 2016-06-21 | 2016-09-07 | 太原理工大学 | Method for combined mining of coal seam gas of cutter column type old goaf and lower coal seam |
| CN106089291A (en) * | 2016-06-21 | 2016-11-09 | 太原理工大学 | A kind of collaborative extraction is caving the old dead zone of formula and the method for lower coal seam coal bed gas |
| CN107401393A (en) * | 2017-07-31 | 2017-11-28 | 山西晋城无烟煤矿业集团有限责任公司 | Water pumping gas production integration goaf gas extraction well casing programme and its construction method |
| CN207048741U (en) * | 2017-07-31 | 2018-02-27 | 山西晋城无烟煤矿业集团有限责任公司 | The drilled well bore structure of gas surface well in a kind of pre- extraction dead zone the following group coal |
| CN107916953A (en) * | 2017-11-24 | 2018-04-17 | 陕西省煤层气开发利用有限公司 | Gas drainage system, pumping method and construction technology based on roof horizontal drilling |
| CN109403943A (en) * | 2018-09-26 | 2019-03-01 | 中国石油天然气股份有限公司 | Staged fracturing method for 3-inch half sidetracking horizontal well |
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