CN115263180B - Coal mine drilling method for water-sensitive rock stratum, construction breaking belt and pressure concentration area - Google Patents
Coal mine drilling method for water-sensitive rock stratum, construction breaking belt and pressure concentration area Download PDFInfo
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- CN115263180B CN115263180B CN202210855518.8A CN202210855518A CN115263180B CN 115263180 B CN115263180 B CN 115263180B CN 202210855518 A CN202210855518 A CN 202210855518A CN 115263180 B CN115263180 B CN 115263180B
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- 238000005553 drilling Methods 0.000 title claims abstract description 258
- 239000011435 rock Substances 0.000 title claims abstract description 60
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 59
- 239000003245 coal Substances 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000010276 construction Methods 0.000 title claims abstract description 28
- 239000002002 slurry Substances 0.000 claims description 17
- 239000004568 cement Substances 0.000 claims description 11
- 238000010408 sweeping Methods 0.000 claims description 11
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 24
- 238000005516 engineering process Methods 0.000 abstract description 9
- 230000003631 expected effect Effects 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 239000010959 steel Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 235000002918 Fraxinus excelsior Nutrition 0.000 description 2
- 239000002956 ash Substances 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000005641 tunneling Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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Abstract
Aiming at the problems that in water-sensitive rock stratum, structural breaking belt and pressure concentration area coal mine drilling method, in water-plugging drilling construction, a drilling hole opening section is positioned in the pressure concentration area, rock stratum breaking hole collapse, bedding construction, water-sensitive rock stratum expansion hole forming is difficult, and the like, through improving the drilling and hole sealing technology, a pipe-following drilling technology is provided, wherein' the large-aperture and high-strength hole opening pipe is firstly put into to protect the hole opening section, then the small-aperture and high-strength hole opening pipe is put into to carry out hole sealing after the breaking belt and the water-sensitive lithology area, the scheme effectively improves the hole sealing length and hole sealing quality of the drilling hole, improves the drilling hole forming, and can ensure that the drilling hole achieves the expected effect.
Description
Technical Field
The invention relates to the technical field of coal mine drilling, in particular to a coal mine drilling method for a water-sensitive rock stratum, a structural breaking zone and a pressure concentration zone.
Background
In recent years, with the increasing of coal mine depth in China, geological structures are more and more complex, and normal drilling construction processes are difficult in some mines, so that the drilling construction is blocked, and the purpose of drilling construction cannot be achieved. The problems of the existing drilling construction are specifically described below in connection with a specific engineering example:
formation conditions of (a) open cell section
The open-pore layer is 11 coal bottom plate shale, the lower distance 13 coal is directly propped with four ashes for 3m, the thickness of a direct top plate of the 13 coal bed is 4.73 m-8.61 m, the average thickness is 6.45m, the upper part is gray, the upper part is impure and contains argillaceous, the horizontal layer is visible, the middle part is purer, the aphanitic structure, and the middle lower part is always clamped with 1-2 layers of irregular black flint layers, compact and hard, and has a suture line structure. The shallow karst cracks develop, the width of the cracks is about 3 mm-5 mm, and the cracks are filled by calcite veins; the karst cave diameter is 3 mm-20 mm. The development degree of karst cracks is obviously deteriorated along with the increase of the burial depth. The 13-coal bottom plate is water-sensitive siltstone with an average thickness of 5m.
The position of the construction drilling site is positioned in a water plugging roadway of-450 m horizontal grouting roadway tunneling downwards, and the coordinates of a grouting chamber are as follows: x=4232, y=2015, z= -472. The coal recovery is completed around the drilling site and 11 coats. The drill site is positioned in the shale with the bottom plate of 11 coals, the bottom plate of the drill site is the shale with the bottom plate of 11 coals, and the bottom plate of the drill site is directly propped by four ashes for 3m from 13 coals.
In the drilling field tunneling process, surrounding rock around the drilling field is damaged to cause loose and broken lithology at the hole opening position, a goaf is arranged on the left side, the right side and the upper side around the drilling field, the block section is a pressure concentration area and is a mechanically unstable rock stratum, and serious hole collapse occurs during hole opening and drilling. Along the drilling construction direction, the rock stratum inclination angle is about-8 degrees to-11 degrees, the drilling design opening inclination angle is about-25 degrees, the openings are positioned in the shale of the 11 bottom plates, the drilling sleeve is required to be placed under the 15 coal bottom plates by 1 m-5 m, the total placement sleeve is 60m, the distance of a broken belt penetrating through the 11 coal bottom plates is expected to be 8m, and the water-swelling water-sensitive rock stratum penetrating through the 13 coal bottom plates is expected to be 10m.
Secondly, aiming at the rock stratum conditions of the overfracture rock stratum, the pressure concentration zone, the bedding drilling, the water sensitive rock stratum and the like, the main problems of the existing drilling process are as follows:
1. The drilling tool assembly used in the conventional drilling process is as follows: phi 146mmPDC core bit + phi 127mmPDC core bit + phi 110mmPDC core (or coreless) bit + matched core barrel + length 1000mm + phi 63.5mm drill rod.
2. In the conventional drilling process, the rock stratum of the open-pore section is harder and broken, a phi 146mmPDC coring bit is adopted to drill to a position of 10m in a rotary mode, and a seamless steel pipe with the phi 146mm and the wall thickness of 5mm is arranged below the drill; the drill is lifted and replaced, a phi 127mmPDC drill bit is rotated to drill through a 13-coal-bed water-sensitive rock stratum to 33m, and a seamless steel pipe with a diameter of 127mm and a wall thickness of 5mm is put in the drill; the drill is lifted and replaced, a phi 110mmPDC drill bit is rotated to drill 15 coal to 5m below the bottom plate, three seamless steel pipes with phi 108mm and 5mm wall thickness are put in for 60m (2 m/piece of seamless steel pipes are connected by screw threads); injecting 425# silicate cement by using NBB 260/7-type mining slurry pump to carry out pipe fixing grouting; and (3) drilling to the designed hole depth position after the replacement phi 75mmPDC coreless drill bit passes the hole sweeping pressure resistance test.
The conventional drilling process aims at the situation that rock stratum of a drilling hole section is broken and pressure is large, water return-free condition and serious hole collapse occur after drilling for 2m by adopting a phi 110mm drill bit, slag return continues more after repeated lifting and hole sweeping, the rock stratum is large table tennis block and sheet rock, the visibility can only reach 1m after drilling for 4m, and subsequent drilling holes are blocked completely. And (3) reaming the hole to 8m by adopting a phi 146mmPDC drill bit, wherein the observation conditions are the same. 1 # holes are turned by adopting a 146mm seamless steel pipe to be put into a sleeve opening 7m, the whole broken area cannot be covered by the length of a fixed pipe sealing hole, and the condition of hole collapse and drill clamping still exists in the subsequent drilling construction by adopting a 127mm or 113mmPDC drill bit; after the water-sensitive siltstone of 18m to 13m coal bottom plate is drilled, the lithology is seriously inflated when encountering water, the drilling is not returned to water, the drilling tool is not lifted or twisted off, and the drilling tool is continuously lost into the hole, so that waste holes are caused. And 2 # holes are drilled to 5m by adopting a 146mmPDC drill bit, and waste holes are caused by the fact that the rear end of the core barrel collapses and a drilling tool cannot be lifted.
The above-mentioned can be seen, in the water shutoff drilling construction, to the drilling trompil section be in pressure concentration district, stratum fracture collapse hole, in order layer construction, water sensitive stratum water swelling pore-forming subalternation problem, conventional trompil, reaming, the construction technology of putting down the sleeve pipe hole sealing can't satisfy the requirement, often lead to the trompil to become the aperture ratio low, the drilling collapse hole falls the sediment seriously, put forward drilling tool drilling collapse hole can't find the drilling or can't reach the sleeve pipe and put down the design position, the core barrel rear collapse hole falls the sediment, put forward drilling tool and cause can't put down the sleeve pipe and become the dead hole scheduling problem. In order to smoothly implement the wall protection of the lower casing, the drilling design requirement is met, and the drilling porosity is guaranteed.
Disclosure of Invention
The invention aims to provide a coal mine drilling method for a water-sensitive rock stratum, a structural breaking belt and a pressure concentration zone, so as to solve the problem that the existing drilling porosity is low and the drilling effect cannot be ensured.
In order to achieve the above object, the present invention provides the following solutions:
the invention provides a coal mine drilling method for a water-sensitive rock stratum, a structural breaking zone and a pressure concentration zone, which is characterized by comprising the following steps of:
A drill hole is formed;
Stopping drilling at the position of a hole bottom of the first drilling hole by adopting the first drilling sleeve with a drill bit to rotate a sweeping hole in the first drilling hole, and leaving the first drilling sleeve in the first drilling hole;
A second open drill hole is formed in the bottom of the first open drill hole, then the first open sleeve is adopted to drill in the second open drill hole in a rotary sweeping mode, and the first open sleeve is left in the second open drill hole; continuing to open the two-open drilling holes until the first-open casing pipe and the pipe are placed down until the first-open casing pipe and the pipe pass through the breaking belt to enter a normal complete rock stratum for 1-2 m, stopping drilling the two-open drilling holes and stopping placing the first-open casing pipe;
Grouting to fix the split sleeve;
a three-way drill hole is formed along the bottom of the one-way sleeve;
Stopping drilling at the position of a rotary sweeping hole in the three-hole drilling hole to the bottom of the three-hole drilling hole by adopting a two-hole sleeve with a drill bit, and leaving the two-hole sleeve in the three-hole drilling hole;
continuing to open the three-open drilling hole until the two-open casing pipe is lowered until the two-open casing pipe penetrates through the 13-coal-bottom water-sensitive rock stratum to enter the normal complete rock stratum for 1-2 m, stopping drilling the three-open drilling hole and stopping lowering the two-open casing pipe;
grouting to fix the two-way sleeve;
a fourth-opening drilling hole is formed along the bottom of the two-opening sleeve;
A three-opening sleeve with a drill bit is adopted to stop drilling at the position of a rotary sweeping hole in the four-way drilling hole to the bottom of the four-way drilling hole, and the three-opening sleeve is left in the four-way drilling hole;
Grouting to fix the three-opening sleeve;
A five-opening drill hole is formed along the bottom of the three-opening sleeve;
the hole diameters of the first drilling hole, the second drilling hole, the third drilling hole, the fourth drilling hole and the fifth drilling hole are sequentially reduced, and the hole diameters of the first casing pipe, the second casing pipe and the third casing pipe are sequentially reduced.
Optionally, when the one-hole drilling is carried out, a drill rod with the diameter of 63.5mm, the diameter of 73mm or the diameter of 50mm and a drill pipe with the diameter of 146mm or the diameter of 133mm with the length of 0.5m are adopted, a core drill with the diameter of 146mm is used for drilling a hole with the diameter of 0.5m, then a rock core pipe with the length of 146mm or the diameter of 133mm is replaced, after the drill pipe with the length of 1m is drilled with the diameter of 1.5m, the rock core pipe with the length of 2m is replaced with the diameter of 146mm or the diameter of 133mm, drilling is carried out until the diameter of 3.5m, and after the rock core pipe with the length of 2m is collapsed, drilling is stopped, and a drilling tool is put forward.
Optionally, the first-opening sleeve is a sleeve with a drill bit at the front part and with the diameter of 146mm or 133mm and the wall thickness of 5 mm; when the hole bottom of the first drilling hole is provided with the second drilling hole, a core bit with phi 127mm or phi 110mm is adopted to match with a core pipe with the length of 2m, the drilling is stopped when the hole bottom is placed down for drilling for 1.8m, and a drilling tool is left in the second drilling hole; and stopping drilling, namely stopping drilling, discharging a screw head after no water return occurs after the first casing pipe is rotated to drill for 2-3 m, and stopping drilling by butt-connecting the phi 127mm or phi 110mm coring drill bit to drill for 2-3 m, and then adopting the first casing pipe to rotate for drilling, so that the first casing pipe is circularly drilled with the pipe until the first casing pipe passes through a breaking belt to enter a normal complete rock stratum for 1-2 m, and stopping drilling.
Optionally, when grouting and fixing the first casing, firstly, drilling a hole with a bore diameter of 50-75 mm and a depth of 1m on the outer side of the first casing, putting 1 small pipe with a length of 1.2m and a diameter of 1 inch into the hole, sealing the hole by quick cement, and injecting cement slurry from the small pipe to the outer side of the first casing.
Optionally, when the three-hole drilling is performed, a drill rod with the diameter of 63.5mm, 73mm or 50mm is connected with a drill bit with the diameter of 127mmPDC, drilling is performed along the middle part of the one-hole casing, and drilling is stopped at a position with the drilling depth exceeding 1m of the one-hole casing; drilling is stopped when the drilling is performed to 1-1.8 m below the bottom opening of the first open sleeve, drilling is stopped after the second open sleeve is connected with the first open sleeve to drill to below the third open phi 110mm drilling tool by rotary reaming, the screw head of the second open phi 127mm drilling tool is removed, the drilling is continued by connecting the third open phi 110mm drilling tool, drilling is stopped when the screw head of the third open sleeve reaches 20cm below the bottom opening of the second open sleeve, drilling is stopped when the drilling tool is removed, reaming is performed by connecting the second open phi 127mm drilling tool, and circulating pipe-following drilling is performed until the second open sleeve passes through the 13 coal bottom water sensitive rock stratum to enter a normal complete rock stratum for 1-2 m, and then the second open sleeve is stopped.
Optionally, the two-way sleeve is a sleeve with a diameter of 127mm and a wall thickness of 5mm and a drill bit at the front part.
Optionally, when the four-way drilling is carried out, drilling is carried out to the position of the lower part of the two-way casing by adopting a drill bit phi 110mm or a drill bit phi 94mmPDC, and the three-way casing is put in.
Optionally, the three-opening sleeve is connected with a flange plug with phi 108mm, a phi 25mm straight-through high-pressure water pipe is connected with an NBB 260/7-type slurry pump, pure cement slurry is injected into the four-opening drilling hole, and grouting is stopped when the gap between the phi 108mm hole sealing pipe and the two-opening sleeve starts to be out of slurry.
Optionally, when the five-opening drilling hole is formed, a phi 75mmPDC drill bit is adopted for drilling.
Compared with the prior art, the invention has the following technical effects:
Aiming at the problems that in water-sensitive rock stratum, structural breaking belt and pressure concentration area coal mine drilling method, in water plugging drilling construction, a drilling hole opening section is positioned in the pressure concentration area, rock stratum breaking and hole collapsing, bedding construction, water-sensitive rock stratum is difficult to expand when meeting water program control and the like, through improving the drilling and hole sealing technology, a pipe-following drilling technology is provided, wherein' the large-aperture and high-strength hole opening pipe is firstly put into to protect the hole opening section, then the small-aperture and high-strength hole opening pipe is put into to seal holes after the breaking belt and the water-sensitive lithology area, the scheme effectively improves the hole sealing length and hole sealing quality of the drilling hole, improves the drilling hole formation rate, and can ensure that the drilling hole can reach the expected effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of a casing drilling construction site according to an embodiment of the present invention.
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 coal mine drilling method for a water-sensitive rock stratum, a structural breaking belt and a pressure concentration zone, so as to solve the problem that the existing drilling porosity is low and the drilling effect cannot be ensured.
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.
Example 1
In the current water shutoff drilling construction, the drilling trompil section is in pressure concentration district, stratum is broken to collapse the hole, in order layer construction, water sensitive stratum meets the water inflation program control subalternation problem, at first how to protect the broken area of hole mouth position 11 coal bed shale, avoid the drilling to collapse the hole seriously, then just go into the large aperture, high strength drill way pipe and protect the drill way section, go into the aperture, high strength drill way pipe again after passing through broken area and water sensitive lithology area and carry out the hole sealing, so not only can guarantee solid pipe seal hole length, also can guarantee drilling smoothness, and then guarantee solid pipe seal hole quality and follow-up drilling's construction, follow-up pipe drilling technique can be used. The operation of the pipe drilling technology, namely the process of firstly putting into a large-aperture high-strength orifice pipe to protect the orifice section, then putting into a small-aperture high-strength orifice pipe to seal holes after passing through a broken belt and a water-sensitive lithology block, is specifically as follows:
The equipment used in the first step is mainly as follows:
Adopts a ZLJ2000D type or ZDY3200LPS coal mine tunnel drilling machine, an NBB 260/7-type slurry pump and a drilling tool combination, mainly adopts the drilling tool combination, and specifically comprises the following steps: ① The drilling tool assembly for drilling holes and shrinkage holes is characterized in that drill rods with the diameter of 63.5mm, 73mm or 50mm are selected as drill rods, a drill bit with the diameter of 146mm or 133mmPDC is selected as a drilling hole, and a drill bit with the diameter of 127mmPDC is selected as a shrinkage hole; the second opening hole is selected from a phi 127mmPDC drill bit, and the shrinkage hole is selected from a phi 110mmPDC drill bit or a phi 94mmPDC drill bit; ② The accessory to be processed is drilled with a pipe, the active drill rod is selected from drill rods with the diameter of 63.5mm, 73mm or 50mm, and an alloy drill bit, a catcher, a screw head, a sleeve and the like are processed by the outer cutting edge.
The specific implementation steps are as follows:
1) The drill is characterized in that a drill rod with the diameter of 63.5mm and a drill pipe with the length of 0.5m and the diameter of 146mm are adopted, a core drill with the diameter of 146mm is used for replacing a rock core pipe with the length of 1m and the diameter of 146mm after the drill bit is opened for 0.5m, a rock core pipe with the length of 2m and the diameter of 146mm is replaced after the drill pipe is drilled for 1.5m, the drill is stopped after the rock core pipe is collapsed, and a drilling tool is put forward; the method comprises the steps of connecting a phi 146mm x 5 front part alloy drill bit sleeve rotary sweeping drill with external cutting edges to a position of 3.5m, stopping drilling, removing a screw head, leaving a phi 146 x 5mm sleeve in a hole, using a phi 127mm or phi 108mm coring drill bit to match with a rock core pipe with a length of 2m, drilling a hole at the bottom of the hole for 1.8m, stopping drilling, leaving the drilling tool in the hole (ensuring that a sleeve protection collapse hole is reserved in the screw head of the two rock core pipes in the bottom of the one open sleeve), stopping drilling after no water return occurs after the one open hole is rotated by the phi 146mm sleeve for 2-3 m, stopping drilling by the two open drill pipes for 2-3 m (always ensuring that the two open screw heads are retained in the one open sleeve protection), stopping drilling by the one open drill pipe for 146mm, and stopping drilling after the two open drill pipes enter into a normal complete rock stratum through a broken belt, and lifting all the drilling tools.
2) And (3) tightly drilling a hole with the diameter of 75mm and the depth of 1m on the outer side of a phi 146mm sleeve, putting 1 small pipe with the length of 1.2m and the diameter of 1 inch into the sleeve, sealing the hole opening by using quick cement, injecting cement slurry into the outer side of the first sleeve from the small pipe with the diameter of 1 inch by using an NBB 260/7-type slurry pump, and stopping after the cement slurry returns into the sleeve. And (5) waiting for solidification for 12 hours, and ensuring that the phi 146mm sleeve is fixed.
3) And connecting a phi 127mmPDC drill bit by adopting a phi 63.5mm drill rod, drilling down along the middle part of the phi 146mm sleeve, stopping drilling at a position with the drilling depth exceeding 1m of the phi 146mm sleeve, and performing a one-open pressure test.
4) And after the first-opening pressure-resistant test is qualified, drilling is stopped when drilling is performed to a position 1.8m below the bottom opening of the first-opening sleeve by adopting a PDC drill bit with phi 108mm and a matched rock core pipe, wherein the sleeve which is connected with the alloy drill bit with phi 127mm and with the external cutting edge at the front part with the wall thickness of 5mm is stopped after drilling the drill bit with phi 110mm from the rotary reaming drilling depth of the bottom opening of the first-opening sleeve, the screw head of the drill bit with phi 127mm is removed, the drilling is continued on the upper three-opening drill, the drilling is stopped when the screw head is stopped to a position 20cm below the bottom opening of the second-opening sleeve, the drilling tool is removed, and the reaming drilling is performed on the upper two-opening sleeve. And (3) drilling with the pipe every 2m in a circulating way until the two-way casing passes through the 13-coal-bed water-sensitive rock stratum and enters the complete rock stratum for 1-2 m, and stopping the two-way casing to be placed under (the placement depth of the two-way casing is about 35 m). Grouting and fixing the two-way sleeve, and performing a pressure-resistant test after 12 hours.
5) And (3) drilling to a casing lower position by using a drill bit phi 110mm or phi 94mmPDC after the pressure test of the two casing openings is qualified, and putting the three casing openings into the casing (the drilling requires that the lower position of the three casing openings is not lower than 60 m).
6) And connecting a flange plug with phi 108mm, connecting a direct high-pressure water pipe with phi 25mm with an NBB 260/7-type slurry pump, injecting pure cement slurry into the hole, stopping grouting when the gap between the hole sealing pipe with phi 108mm and the sleeve with phi 127mm starts to be out of the slurry, and drilling and waiting for solidification.
7) And Hou Ningjie bundles of holes to be drilled are drilled normally by adopting a phi 75mmPDC drill bit.
Drilling structure formed by the following pipe drilling technology: firstly, drilling the sleeve with diameter of 146mm by 1 m-2 m beyond the breaking belt; drilling a drill pipe by adopting a phi 127mmPDC drill bit to penetrate 1 m-2 m beyond the water sensitive rock stratum; drilling to a designed casing lower position by adopting a phi 108mmPDC drill bit; and four corners are normally drilled to the final hole positions by adopting a phi 75mmPDC drill bit.
(III) analysis of pipe-following drilling technical effect in water plugging drilling depression angle construction
① The hole sealing length and the hole sealing quality of the drilling holes are improved
Compared with the prior art, the drilling hole sealing length is increased from 10m to 35m, the seamless steel sleeve is used for hole sealing, the hole sealing strength is guaranteed, the bending degree of the orifice pipe is straighter compared with that of a conventional sleeve hole sealing process after the orifice pipe is deeply molded once, the deviation of the design azimuth of the deep drilling hole by utilizing the large orifice is reduced, drilling tools and slag discharge are more beneficial in the subsequent drilling construction, and the condition of unqualified water leakage and pressure resistance is avoided after the pure cement slurry is adopted for fixing the pipe of the three-stage sleeve;
② Improved hole forming rate of drill hole
The hole sealing and wall protecting technology is adopted for drilling, the constructed 3# holes, the constructed 4# holes, the constructed 5# holes and the constructed 6# holes are all constructed to the positions according to the design requirements, the communication experiment is carried out through drilling, the communication effect with the water outlet point is obvious, the drilling construction requirement is met, the water outlet point is plugged by grouting at present, the plugged water is 100m 3/h, and the method exceeds the expectation that grouting and water plugging cannot be completed due to failure of drilling in underground construction.
According to the water-plugging drilling construction, the problems that the drilling hole section is positioned in a pressure concentration area, the rock stratum is broken and collapses, the water-sensitive rock stratum is subjected to bedding construction and the hole is difficult to form when meeting water expansion are solved, the drilling hole-sealing length and the hole-sealing quality are effectively improved by improving the drilling hole-sealing process and adopting the pipe-following drilling technology, the drilling hole-forming rate is improved, and the expected drilling effect can be guaranteed.
It should be noted that it will be apparent to those skilled in the art that the present invention is not limited to the details of the above-described exemplary embodiments, but may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; 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 (9)
1. A method of drilling a coal mine in a water sensitive rock formation, in constructing a fracture zone and a pressure concentrating zone, comprising:
A drill hole is formed;
Stopping drilling at the position of a hole bottom of the first drilling hole by adopting the first drilling sleeve with a drill bit to rotate a sweeping hole in the first drilling hole, and leaving the first drilling sleeve in the first drilling hole;
A second open drill hole is formed in the bottom of the first open drill hole, then the first open sleeve is adopted to drill in the second open drill hole in a rotary sweeping mode, and the first open sleeve is left in the second open drill hole; continuing to open the two-open drilling holes until the first-open casing pipe and the pipe are placed down until the first-open casing pipe and the pipe pass through the breaking belt to enter a normal complete rock stratum for 1-2 m, stopping drilling the two-open drilling holes and stopping placing the first-open casing pipe;
Grouting to fix the split sleeve;
a three-way drill hole is formed along the bottom of the one-way sleeve;
Stopping drilling at the position of a rotary sweeping hole in the three-hole drilling hole to the bottom of the three-hole drilling hole by adopting a two-hole sleeve with a drill bit, and leaving the two-hole sleeve in the three-hole drilling hole;
continuing to open the three-open drilling hole until the two-open casing pipe is lowered until the two-open casing pipe penetrates through the 13-coal-bottom water-sensitive rock stratum to enter the normal complete rock stratum for 1-2 m, stopping drilling the three-open drilling hole and stopping lowering the two-open casing pipe;
grouting to fix the two-way sleeve;
a fourth-opening drilling hole is formed along the bottom of the two-opening sleeve;
A three-opening sleeve with a drill bit is adopted to stop drilling at the position of a rotary sweeping hole in the four-way drilling hole to the bottom of the four-way drilling hole, and the three-opening sleeve is left in the four-way drilling hole;
Grouting to fix the three-opening sleeve;
A five-opening drill hole is formed along the bottom of the three-opening sleeve;
the hole diameters of the first drilling hole, the second drilling hole, the third drilling hole, the fourth drilling hole and the fifth drilling hole are sequentially reduced, and the hole diameters of the first casing pipe, the second casing pipe and the third casing pipe are sequentially reduced.
2. The method for drilling a coal mine with a water sensitive rock stratum, a structural breaking belt and a pressure concentration zone according to claim 1, wherein when the one-hole drilling is carried out, a drill rod with the length of 1000mm phi 63.5mm and a drill pipe with the length of 0.5m phi 146mm are adopted, a core drill with the length of 1m phi 146mm is replaced after the drill bit with the length of phi 146mm is opened for 0.5m, a core drill with the length of 2m phi 146mm is replaced after the drill bit with the length of 1.5m is drilled to 3.5m, and drilling is stopped after the hole collapse occurs after the core drill with the length of 2m phi 146mm is carried out, and a drilling tool is lifted.
3. The method for drilling a coal mine with a water sensitive rock formation, a structural fracture zone and a pressure concentrating zone according to claim 2, wherein the one-open casing is a casing with a phi 146mm wall thickness of 5mm and a drill bit at the front part; when the hole bottom of the first drilling hole is provided with the second drilling hole, a core bit with phi 127mm or phi 110mm is adopted to match with a core pipe with the length of 2m, the drilling is stopped when the hole bottom is placed down for drilling for 1.8m, and a drilling tool is left in the second drilling hole; and stopping drilling, namely stopping drilling, discharging a screw head after no water return occurs after the first casing pipe is rotated to drill for 2-3 m, and stopping drilling by butt-connecting the phi 127mm or phi 110mm coring drill bit to drill for 2-3 m, and then adopting the first casing pipe to rotate for drilling, so that the first casing pipe is circularly drilled with the pipe until the first casing pipe passes through a breaking belt to enter a normal complete rock stratum for 1-2 m, and stopping drilling.
4. A method of drilling a coal mine with a water sensitive rock formation, a structural fracture zone and a pressure concentration zone according to claim 3, wherein when the primary casing is fixed by grouting, firstly, a hole with a diameter of 75mm and a depth of 1m is drilled on the outer side of the primary casing, 1 small pipe with a length of 1.2m and a diameter of 1 inch is put in, an orifice is sealed by quick cement, and cement slurry is injected from the small pipe to the outer side of the primary casing.
5. The method for drilling coal mine with water sensitive rock stratum, structural breaking belt and pressure concentration area according to claim 3 or 4, wherein when the three-open drill hole is formed, a drill rod with the length of 1000mm phi of 63.5mm is adopted, a phi 127mmPDC drill bit is connected, the drill bit is used for drilling down along the middle part of the one-open casing, and the drilling depth exceeds the position of 1m of the one-open casing; and stopping drilling when drilling to the position 1.8m below the bottom opening of the first open sleeve, connecting the second open sleeve, stopping drilling after drilling to the position 1 m-2 m below the third open phi 110mm drilling tool from the rotary reaming of the bottom opening of the first open sleeve, removing the screw head of the second open phi 127mm drilling tool, continuously drilling after the third open drilling tool is connected with the third open phi 110mm drilling tool, stopping drilling when the screw head is moved to the position 20cm below the bottom opening of the second open sleeve, removing the drilling tool, reaming and drilling the second open phi 127mm drilling tool, and stopping the second open sleeve after the second open sleeve passes through the 13 coal bottom water-sensitive rock stratum and enters the normal complete rock stratum for 1 m-2 m.
6. The method of drilling a coal mine with a water sensitive rock formation, a fractured zone of construction and a pressure concentrating zone of claim 5 wherein said two-way casing is a phi 127mm 5mm wall thickness front-end casing with a drill bit.
7. The method of drilling a coal mine with a water sensitive rock formation, a structural fracture zone and a pressure concentrating zone according to claim 6, wherein when the four-way borehole is formed, a phi 110mm or phi 91mmPDC drill bit is used for drilling to the position below the two-way casing, and the three-way casing is placed.
8. The method for drilling a coal mine with water sensitive rock stratum, structural breaking belt and pressure concentration area according to claim 7, wherein the three-opening casing is connected with a phi 108mm flange plug, a phi 25mm through high-pressure water pipe is connected with an NBB 260/7-type slurry pump, pure cement slurry is injected into the four-opening drilling hole, and grouting is stopped when the gap between the phi 108mm casing and the two-opening casing begins to be out of slurry.
9. The method of drilling a coal mine with a water sensitive rock formation, a fractured zone of construction and a pressure concentrating zone of claim 8, wherein the five-way borehole is drilled with a phi 75mmPDC drill bit.
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| CN104564031A (en) * | 2014-12-24 | 2015-04-29 | 永城煤电控股集团有限公司 | Method for measuring pressure of gas in coal seam in fracture rock stratum |
| CN111456723A (en) * | 2020-04-08 | 2020-07-28 | 中国矿业大学 | One-hole dual-purpose method for overburden three-zone detection and rock stratum movement monitoring |
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| RU2474668C1 (en) * | 2012-04-16 | 2013-02-10 | Открытое акционерное общество "Татнефть" им. В.Д. Шашина | Well construction method |
| CN112901247A (en) * | 2021-04-06 | 2021-06-04 | 中国矿业大学 | Coal mine underground multistage sleeve long-distance fire prevention and extinguishing drilling construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104564031A (en) * | 2014-12-24 | 2015-04-29 | 永城煤电控股集团有限公司 | Method for measuring pressure of gas in coal seam in fracture rock stratum |
| CN111456723A (en) * | 2020-04-08 | 2020-07-28 | 中国矿业大学 | One-hole dual-purpose method for overburden three-zone detection and rock stratum movement monitoring |
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