CN110607995B - Method for preventing casing from being broken in new underground construction hydrological drilling - Google Patents
Method for preventing casing from being broken in new underground construction hydrological drilling Download PDFInfo
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- CN110607995B CN110607995B CN201910931986.7A CN201910931986A CN110607995B CN 110607995 B CN110607995 B CN 110607995B CN 201910931986 A CN201910931986 A CN 201910931986A CN 110607995 B CN110607995 B CN 110607995B
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- casing
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- plastic pipe
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- 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
Abstract
The invention discloses a method for preventing casing fracture in a new underground construction hydrological drilling hole, which comprises the specific steps of manufacturing a fracture-preventing casing, drilling, lowering the fracture-preventing casing, grouting in the fracture-preventing casing, in-situ hole sweeping drilling, performing a casing pressure test, installing a high-pressure blowout-preventing valve at an orifice after the pressure test meets the design requirement, and then in-situ hole drilling to extend to the depth of a final hole, wherein the fracture-preventing casing is provided with a short section of plastic pipe and a long section of plastic pipe. The method adopts a mode of separating the conventional rigid casing from the hole wall surrounding rock at the large deformation section of the surrounding rock, and the conventional rigid casing is not influenced when the surrounding rock is subjected to large deformation and fracture; the method is convenient to operate, and can effectively prevent the fracture problem of the underground coal mine hydrological drilling casing.
Description
Technical Field
The invention relates to the field of coal mine safety, in particular to a method for preventing casing from being broken in a new underground construction hydrological drilling hole.
Background
The water level data of the main aquifer of the coal mine is mainly acquired in real time through a hydrological observation hole. In the north China coal field, a mine is mainly threatened by the water damage of an Ordovician limestone aquifer, a plurality of Ordovician limestone hydrological observation holes are usually constructed underground, the hydrological observation holes are generally constructed vertically, and the safety evaluation work of related mining is carried out through water level data monitored in real time. The observation hole is provided with a sleeve made of a longer steel pipe according to coal mine safety regulations, a high-pressure blowout preventer is also required to be arranged at an orifice during construction so as to prevent a drilling machine from being flushed by high-pressure large-flow water, a water pressure monitoring device is arranged in the hole after construction is finished, and a high-pressure valve is arranged at the orifice. And in the later stage, an inspection system is required to be established so as to ensure the safe operation of the underground hydrological observation hole.
Because normally used orifice pipes are all in a closed hole monitoring state, once the sleeve is broken, high-pressure bearing water in the hole disperses to flow outwards along the cracks of the rock stratum from the broken position of the sleeve, and cannot be controlled, if the drainage capacity of an original mine is insufficient, the phenomenon of water accumulation of the mine is even caused. The casing and the wall of the borehole are generally consolidated into a whole by cement slurry. The cause of casing fracture is mainly caused by the fact that roadways and surrounding rocks of chambers at the positions of hydrological observation hole positions deform and break under the action of earth pressure and water pressure to generate loose circles and bottom bulges. As the sleeve and the rock on the hole wall are consolidated into a whole, once the rock stratum at the position of the hole wall generates large-amplitude deformation, the sleeve is pulled to deform, and when the deformation exceeds the bearing capacity of the rigid sleeve, the sleeve is broken. After the casing is fractured, high pressure water within the bore will flow out of the fracture site along the fractures of the fractured rock formation. The treatment difficulty is high, and certain dangerousness exists. According to a large number of research results and detection results of casing fracture, the distance between the position of casing fracture and the orifice is generally 0.5-1.0 times of the width of the roadway and the chamber where the casing fracture is located.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide the casing fracture prevention method for the underground new construction hydrological drilling, which has the advantages of simple principle, convenience and safety in operation and capability of effectively preventing the casing fracture problem of the underground new construction hydrological drilling.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention provides a method for preventing casing from being broken in a new underground construction hydrological borehole, which specifically comprises the following steps:
1) manufacturing an anti-fracture sleeve; if the width of the roadway and the chamber where the hydrological observation hole is located is L, and the thickness of the roadway and the surrounding rock of the chamber which are greatly deformed and broken is generally smaller than L, the manufacturing steps of the fracture-preventing sleeve are as follows:
a. firstly, preparing a conventional rigid casing pipe made of a conventional steel pipe according to a design, wherein the total length of the conventional rigid casing pipe is L longer than that of the casing pipe specified in coal mine safety regulation;
b. bonding a short-section plastic pipe with the length of 0.2m at a section with the distance of L to (L +0.2m) from the orifice of the conventional rigid casing pipe;
c. a long plastic pipe with the length of L +0.2m is bonded outside the short plastic pipe, and the span of the long plastic pipe in the conventional rigid casing pipe is a section from the pipe orifice to (L +0.2 m);
2) drilling to a certain depth by adopting a drill bit with a certain specification according to design requirements;
3) lowering the anti-fracture casing in the drill hole, wherein the lowering depth is less than the depth of the drill hole by 0.2 m;
4) adopting a mode of grouting in the fracture-preventing casing and grout return between the fracture-preventing casing and the wall of the drilled hole, fixing the casing by using single-liquid cement grout, and stopping grouting after the grout returns out;
5) after the single-liquid cement slurry for pipe fixing is fully cured, in-situ hole sweeping drilling is carried out, the drilling is extended for 0.5m, and a casing pipe pressure resistance test is carried out;
6) and after the pressure resistance test meets the design requirement, a high-pressure blowout prevention valve is installed at the orifice, and the in-situ trepanning is drilled and extended to the depth of the final hole.
Preferably, in the step b in the step 1), the inner diameter of the short section plastic pipe is 0.5mm larger than the outer diameter of the conventional rigid casing pipe, the length of the short section plastic pipe is 0.2m, and the thickness of the pipe wall is 10 mm.
Preferably, in the step c in the step 1), the inner diameter of the long-section plastic pipe is 0.5mm larger than the outer diameter of the short-section plastic pipe, and the thickness of the pipe wall of the long-section plastic pipe is 3-5 mm.
Preferably, in the step 1), the short plastic pipe and the long plastic pipe are both made of polyvinyl chloride.
Preferably, in the step 1), an annular column-shaped hollow structure with the length of L is arranged between the manufactured anti-fracture casing pipe, the long-section plastic pipe and the conventional rigid casing pipe.
Preferably, in the step 4), the water-cement ratio of the single-fluid cement slurry is 0.8: 1.
preferably, in the step 4), slurry cannot enter the annular columnar hollow structure with the length of L between the long plastic pipe and the conventional rigid casing pipe in the pipe fixing process, namely the L section of the orifice of the conventional rigid casing pipe is separated from surrounding rock of the wall of the drilled hole.
The invention has the beneficial effects that: according to the invention, a mode of separating a conventional rigid casing pipe from a solid pipe cement mortar stone body is adopted in the predicted deformation and fracture section of the surrounding rock at the opening position of the hydrological observation hole, when the surrounding rock at the opening position of the hydrological observation hole is subjected to large deformation and fracture, due to the existence of long sections of plastic pipes, the deformation of the surrounding rock along the casing pipe direction can quickly break the long sections of plastic pipes for separation, and the influence on the conventional rigid casing pipe can be avoided; the deformation of surrounding rock along the direction perpendicular to the sleeve pipe, because the clearance of the long-section plastic pipe for separation and the interior of the conventional rigid sleeve pipe can absorb the deformation of the part, the conventional rigid sleeve pipe cannot be influenced, the method is convenient to operate, and the fracture problem of the underground coal mine hydrographic drilling sleeve pipe can be effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of the position of a fracture-preventing casing and surrounding rock according to an embodiment of the invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
Description of reference numerals:
1-surrounding rock; 2-conventional rigid casing; 3-cementing stone bodies; 4-short section plastic pipe; 5-long section of plastic pipe.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 2, a method for preventing casing fracture in a newly constructed hydrological borehole in a well comprises the following steps: the method specifically comprises the following steps:
1) if the observed water pressure of a target aquifer is more than 3.0MPa, the length of the designed casing pipe needs to be more than 20m according to coal mine safety regulations, and the effective length of the designed casing pipe is 20.8 m; if the width of the roadway and the chamber where the hydrological observation hole is located is 5m, the manufacturing steps of the fracture-preventing sleeve are as follows:
a. firstly, preparing a conventional rigid sleeve 2 made of a conventional steel pipe with the total length of 26 m;
b. in a section which is 5.0-5.2 m away from the orifice of the conventional rigid casing 2, 502 glue is adopted to bond a short section plastic pipe 4 made of polyvinyl chloride (PVC) and having a length of 0.2m, the outer diameter of the conventional rigid casing 2 is 108mm, the inner diameter of the short section plastic pipe 4 is 108.5mm, and the pipe wall thickness of the short section plastic pipe 4 is 10 mm;
c. a long-section plastic pipe 5 made of polyvinyl chloride (PVC) with the inner diameter of 129mm and the pipe wall thickness of 3mm is bonded outside the short-section plastic pipe 4 by 502 glue, the span of the long-section plastic pipe 5 in the conventional rigid casing 2 is a section from the pipe opening to 5.2m, and an annular space with the thickness of 11mm is formed between the section from the pipe opening to 5.0m of the long-section plastic pipe 5 and the conventional rigid casing 2;
2) drilling a hole by using a drill bit with the diameter of 146mm for 5.2m, and then drilling the hole to the hole depth of 26m by using a drill bit with the diameter of 127mm through in-situ trepanning;
3) lowering an anti-fracture casing pipe 25.8m in the drill hole;
4) adopt the intraductal slip casting of cover, prevent returning the mode of thick liquid between fracture sleeve pipe and the pore wall, carry out solid pipe with single liquid grout, select for use single liquid grout's water cement ratio 0.8: 1;
5) after the single-liquid cement slurry for pipe fixing is fully cured, the cement slurry concretion body 3 enables the casing pipe and the surrounding rock of the wall of the drilled hole to be fixed into a whole, a drill bit with the diameter of 75mm is adopted to carry out in-situ hole sweeping drilling to the hole depth of 26.5m, and a casing pipe pressure test is carried out;
6) and after the pressure resistance test meets the design requirement, mounting a high-pressure blowout prevention valve at the orifice, and drilling by adopting a drill bit with the diameter of 75mm in situ trepanning to extend to the depth of a final hole.
After the anti-fracture casing is installed, the conventional rigid casing 2 is separated from the surrounding rock 1 of the hole wall from the hole opening to the section of 5.0m, when the surrounding rock 1 at the drilling position is deformed and fractured, the conventional rigid casing 2 cannot be influenced, and the conventional rigid casing 2 cannot be fractured naturally. The total installation length of the conventional rigid casing 2 is 26m, and the length of the conventional rigid casing which is fixed with the surrounding rock 1 through the cement bonded rock body 3 is 20.8m, so that the effective length of the conventional rigid casing can be ensured to be 20.8 m.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. A casing fracture prevention method for a new underground construction hydrological borehole is characterized by comprising the following steps:
1) manufacturing an anti-fracture sleeve; if the width of the roadway and the chamber where the hydrological observation hole is located is L, and the thickness of the roadway and the surrounding rock of the chamber which are greatly deformed and broken is generally smaller than L, the manufacturing steps of the fracture-preventing sleeve are as follows:
a. firstly, preparing a conventional rigid casing pipe made of a conventional steel pipe according to a design, wherein the total length of the conventional rigid casing pipe is L longer than that of the casing pipe specified in coal mine safety regulations;
b. bonding a short-section plastic pipe with the length of 0.2m to a section which is L-L +0.2m away from the orifice of the conventional rigid casing pipe;
c. a long plastic pipe with the length of L +0.2m is bonded outside the short plastic pipe, and the long plastic pipe is a section from the pipe orifice to L +0.2m in the span of the conventional rigid casing; an annular columnar hollow structure with the length of L is formed between the long plastic pipe section and the conventional rigid sleeve;
2) drilling to a certain depth by adopting a drill bit with a certain specification according to design requirements;
3) lowering the anti-fracture casing in the drill hole, wherein the lowering depth is less than the depth of the drill hole by 0.2 m;
4) adopting a mode of grouting in the fracture-preventing casing and grout return between the fracture-preventing casing and the wall of the drilled hole, fixing the casing by using single-liquid cement grout, and stopping grouting after the grout returns out; in the pipe fixing process, slurry cannot enter between the long plastic pipe and the conventional rigid casing pipe and is in an annular columnar hollow structure with the length of L, namely the L section of the orifice of the conventional rigid casing pipe is separated from surrounding rock of the wall of the drilled hole;
5) after the single-liquid cement slurry for pipe fixing is fully cured, in-situ hole sweeping drilling is carried out, the drilling is extended for 0.5m, and a casing pipe pressure resistance test is carried out;
6) and after the pressure resistance test meets the design requirement, a high-pressure blowout prevention valve is installed at the orifice, and the in-situ trepanning is drilled and extended to the depth of the final hole.
2. The method for preventing casing fracture in new downhole construction hydrographic drilling according to claim 1, wherein in step b in step 1), the inner diameter of the short section plastic pipe is 0.5mm larger than the outer diameter of the conventional rigid casing, the length of the short section plastic pipe is 0.2m, and the thickness of the pipe wall is 10 mm.
3. The method for preventing casing fracture in new downhole construction hydrological drilling according to claim 1, wherein in the step 1), the inner diameter of the long-section plastic pipe is 0.5mm larger than the outer diameter of the short-section plastic pipe, and the thickness of the long-section plastic pipe is 3-5 mm.
4. The method for preventing casing fracture in new downhole construction hydrographic drilling according to claim 1, wherein in the step 1), the short-section plastic pipe and the long-section plastic pipe are both made of polyvinyl chloride.
5. The method for preventing casing fracture in hydrological drilling of new downhole construction according to claim 1, wherein in the step 4), the water cement ratio of the single-fluid cement slurry is 0.8: 1.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910931986.7A CN110607995B (en) | 2019-09-29 | 2019-09-29 | Method for preventing casing from being broken in new underground construction hydrological drilling |
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| CN201910931986.7A CN110607995B (en) | 2019-09-29 | 2019-09-29 | Method for preventing casing from being broken in new underground construction hydrological drilling |
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| CN110607995A CN110607995A (en) | 2019-12-24 |
| CN110607995B true CN110607995B (en) | 2020-06-16 |
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| CN114635670B (en) * | 2022-02-25 | 2023-02-10 | 中国矿业大学 | Method for preventing fracture of geological casing for underground existing hydrographic drilling |
| CN114635674A (en) * | 2022-02-25 | 2022-06-17 | 中国矿业大学 | Fracture prevention method for orifice pipe for uneven deformation stratum |
| CN114607310A (en) * | 2022-02-25 | 2022-06-10 | 兖矿能源集团股份有限公司 | Method for preventing and treating breakage of constructed drilling orifice pipe |
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| KR100657418B1 (en) * | 2006-04-28 | 2006-12-15 | 주식회사 지오웍스 | Method for horizontally drilling filtrate intake well and apparatus for clogging front tip of well |
| KR100871882B1 (en) * | 2007-01-30 | 2008-12-05 | 김수현 | Pile construction method by multi section segment pile |
| CN203175461U (en) * | 2012-12-30 | 2013-09-04 | 沈阳北方重矿机械有限公司 | Novel in-hole deslagging and plugging device |
| CN206205881U (en) * | 2016-10-19 | 2017-05-31 | 山东科技大学 | A kind of coal seam infusion effect verifying attachment |
| CN207033396U (en) * | 2017-07-24 | 2018-02-23 | 西安石油大学 | A kind of normal circulation downhole preventer combination of self-opening type |
| CN207659962U (en) * | 2017-12-22 | 2018-07-27 | 长安大学 | A kind of plastic bushing device for reducing force of negative friction impact effect suffered by bored concrete pile |
| CN208122791U (en) * | 2018-04-10 | 2018-11-20 | 中国石油化工股份有限公司 | Casing-broken, which is reinforced, mends adapter tube column |
| CN208330209U (en) * | 2018-05-30 | 2019-01-04 | 河南省中能联建地热工程有限公司 | A kind of geothermal well special protection casing |
| CN109339708B (en) * | 2018-10-29 | 2020-05-15 | 武大巨成结构股份有限公司 | Hole forming process of anchoring hole bottom reaming device |
| CN109162644A (en) * | 2018-11-09 | 2019-01-08 | 山西潞安矿业(集团)有限责任公司 | Injected hole sealing casing and its application method for underground extraction borehole operation |
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