CN114320220A - CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry - Google Patents
CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry Download PDFInfo
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- CN114320220A CN114320220A CN202210062130.2A CN202210062130A CN114320220A CN 114320220 A CN114320220 A CN 114320220A CN 202210062130 A CN202210062130 A CN 202210062130A CN 114320220 A CN114320220 A CN 114320220A
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- grouting
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- repairing
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- 239000002002 slurry Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 5
- 239000006260 foam Substances 0.000 title claims description 19
- 238000000605 extraction Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 230000008439 repair process Effects 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 21
- 238000010276 construction Methods 0.000 claims description 17
- 239000011440 grout Substances 0.000 claims description 13
- 239000002738 chelating agent Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 7
- 239000013078 crystal Substances 0.000 claims description 6
- 238000004880 explosion Methods 0.000 claims description 6
- 239000011435 rock Substances 0.000 claims description 6
- 239000011398 Portland cement Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000005422 blasting Methods 0.000 claims description 4
- 239000004615 ingredient Substances 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 claims description 4
- 238000003756 stirring Methods 0.000 claims description 3
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical compound [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 6
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000002244 precipitate Substances 0.000 abstract description 3
- 230000000536 complexating effect Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 11
- 239000004568 cement Substances 0.000 description 9
- 239000004814 polyurethane Substances 0.000 description 7
- 229920002635 polyurethane Polymers 0.000 description 7
- 239000011575 calcium Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 3
- 229910052791 calcium Inorganic materials 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000003566 sealing material Substances 0.000 description 3
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 2
- 229910001424 calcium ion Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007712 rapid solidification Methods 0.000 description 1
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Abstract
The invention discloses CO2The method is characterized in that slurry materials with self-repairing characteristics are injected into the sealed end of a drill hole, and the slurry can be solidified with CO2And the water in the air is subjected to a complexing reaction to generate mineral substance precipitates, so that the automatic repair of cracks is realized, and the extraction concentration of the gas in the drill hole is further improved.
Description
Technical Field
The invention belongs to the field of coal mine gas extraction, and particularly relates to CO2A construction method for repairing the fracture of an extracted borehole by combining foam and self-repairing slurry.
Background
At present, hole sealing materials used for coal mine gas extraction mainly comprise four types of clay (yellow mud), cement-based materials, high-water materials and polyurethane materials.
The clay (yellow mud) type material is the earliest sealing material and is derived from widely distributed semi-dry clay, yellow mud or yellow mud-cement mixture with fine texture and high plasticity. The sealing material has low price and relatively simple construction operation, but has larger viscosity, is easy to adhere with the hole wall of a drill hole to form a gap for air leakage, is not easy to be delivered to a specified position, is not suitable for sealing the deep hole and is rarely adopted.
And sealing the hole with cement mortar. The traditional cement grout has longer setting time, can be dehydrated and contracted in the curing process, is easy to cause cracks in a cement hole sealing body, and the cracks can be continuously expanded and developed to cause the hole sealing section to completely lose efficacy.
And sealing the pores with high water content material. The high-water material has the advantages of high water-cement ratio, rapid solidification, rapid strength improvement, micro-expansibility and the like. But the permeability of the cracks around the drill hole is poor, cracks can still be generated in the later period of extraction, and the self-repairing force is not provided.
And sealing the hole with polyurethane. Polyurethane can take place chemical reaction in the drilling, makes polyurethane expand fast, and the radial effort of drilling has been increased to the expansibility, and this kind of effort is reverse to promote polyurethane to permeate the crack, plays the effect of shutoff drilling. But the reaction is limited by the underground condition and the polyurethane material after the polyurethane material is uniformly mixed for 40-60s, the hole sealing length is only 4m, the gas extraction concentration is low and the gas extraction concentration is attenuated quickly because cracks generated by a loose circle of a roadway cannot be effectively avoided entering a drill hole.
The fracture zone around the hole wall of the drill hole can be further expanded and developed under the influence of mining stress in the gas extraction process, and the plugging material in the drill hole can also generate fractures, so that the external air can easily enter the drill hole from the fracture channels under the action of pumping negative pressure, and the gas extraction concentration is reduced. Therefore, when the existing grouting material is adopted for crack repair construction, once cracks are generated to cause the leakage of the drill hole, the extraction effect is rapidly reduced, the drill hole and the sealing hole need to be drilled again, and great financial and material resource loss is caused. Therefore, a construction method capable of effectively repairing the fracture of the extraction borehole is urgently needed so as to improve the gas extraction effect.
Disclosure of Invention
In order to solve the defects of the prior art, the invention aims to provide CO2The method is characterized in that slurry materials with self-repairing characteristics are injected into the sealed end of a drill hole, and the slurry can be solidified with CO2And the water in the air is subjected to a complexing reaction to generate mineral substance precipitates, so that the automatic repair of cracks is realized, and the extraction concentration of the gas in the drill hole is further improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a construction method for repairing an extracted borehole crack by combining CO2 foam and self-repairing slurry comprises the following steps:
1) checking before hole sealing: checking the drilled hole to ensure that the drilled hole is complete and smooth;
2) correspondingly sleeving hole packers at the head end and the tail end of the gas drainage pipe, and fixing a bag of the hole packers on the gas drainage pipe;
3) the grouting pipe penetrates through the two bags and is fixed on the gas drainage pipe, and corresponding grout outlets are formed in the positions of the two bags by the grouting pipe; a blasting valve is arranged on the grouting pipe between the two bags and at the middle sealing end; and the sealing end of the slurry return pipe extending into the middle part is fixed on the grouting pipe;
4) the gas drainage pipe with the fixed hole packer and the grouting pipe is conveyed to the preset coal hole depth together;
5) communicating a grouting pipe with a grouting pump of a grouting device, connecting the grouting device with an air source, and adjusting an air pressure valve of the grouting device;
6) pouring clear water into the grouting device, opening a stirrer of the grouting device, pouring self-repairing slurry ingredients mixed by portland cement and a metal chelating agent, and starting grouting after stirring is completed;
7) the slurry is firstly injected into the bag at the two ends through the slurry outlet, the grouting is continued after the bag slurry is filled to explode the explosion valve, the slurry is injected into the middle sealing section until the slurry flows out of the slurry return pipe, and at the moment, the second one-way valve at the port of the slurry return pipe is closed;
8) stopping grouting, blocking the grouting pipe at the drilling hole, removing the grouting pipe, and finishing single-hole grouting;
9) after the slurry is solidified, connecting an extraction system, and periodically detecting the gas concentration, the negative pressure and the flow of the gas extraction drill hole;
10) when the gas extraction concentration is reduced due to the fact that cracks appear on the wall surface around the drill hole or in the drill hole and cause gas leakage of the drill hole, CO is utilized2The foam spraying system sprays CO to the wall surface of the surrounding rock of the drill hole2Foam, CO2The foam penetrates into the crack and reacts with the self-repairing material to generate new crystals to automatically repair the crack.
Wherein, the bag in the step 2) is fastened and fixed on the gas drainage pipe through an iron wire.
And 3) a first one-way valve is arranged at the grout outlet of the grouting pipe corresponding to the bag.
The material components of the slurry in the step 6) are 95 percent of ordinary portland cement and 5 percent of metal chelating agent.
And 6), adopting EDTA tetrasodium as the metal chelating agent.
The weight ratio of the materials to the water of the self-repairing slurry in the step 6) is 1: 0.7.
the set explosion pressure value of the explosion valve in the step 7) is 0.5 MPa.
The invention has the following beneficial effects:
the construction method provided by the invention has the advantages that the grout material with the self-repairing characteristic is injected into the drill hole, so that once cracks appear after the grout is solidified, the grout can be mixed with moisture and CO in the air2The complex reaction is carried out to generate mineral substance precipitation, thereby realizing the automatic repair of the crack. At the same time, CO is utilized2The foam spraying system sprays CO to the wall surface of the surrounding rock of the drill hole2Foams, further sealingBlocking the fracture channel of the surrounding rock and providing sufficient CO for the self-repairing slurry2The gas source strengthens the self-repairing capability of the slurry, and promotes a large amount of insoluble crystals to be generated in the cracks, so that the cracks are plugged, and the gas extraction effect is improved.
Drawings
FIG. 1 is a schematic view of the construction operation of the present invention;
FIG. 2 is a drilling crack gas leakage model under the gas extraction negative pressure action of the invention;
FIG. 3 is a mechanism of complex precipitation at the crevices of the present invention.
Detailed Description
As shown in FIG. 1, the present invention proposes a CO2The construction method for repairing the extracted borehole fracture by combining the foam and the self-repairing slurry comprises the following steps:
1) checking before hole sealing: and checking the drilled hole to ensure that the drilled hole is complete and smooth and prepare for installing plugging materials.
2) The head end and the tail end of the gas drainage pipe 3 extending into the drill hole are correspondingly sleeved with hole packers, and bags 5 of the hole packers are fastened and fixed on the gas drainage pipe 3 through iron wires. The gas drainage pipe 3 is connected to a gas extractor 31.
3) The grouting pipe 2 penetrates through the two bags 5 and is fixed on the gas drainage pipe 3, and the head of the grout return pipe 4 extends into the sealing end of the middle part and is fixed on the grouting pipe 2. Wherein, the grouting pipe 2 is provided with corresponding grout outlets at the two bags 5, and the grout outlets of the grouting pipe 2 corresponding to the bags 5 are provided with a first one-way valve 23. The grouting pipe 2 between the two bags 5 and at the middle sealing end is provided with a blasting valve 22. The grouting pipe 2 is also provided with a pressure gauge 21. The head of the grouting pipe 2 is provided with a gas extraction sieve pipe 32.
4) And (3) conveying the gas drainage pipe 3 with the fixed hole packer and the grouting pipe 2 to the preset coal hole depth.
5) And (3) communicating the grouting pipe 2 with a grouting pump 1 of a grouting device, connecting the grouting device with an air source, and adjusting an air pressure valve of the grouting device.
6) Pouring clear water into the grouting device, opening a stirrer of the grouting device, and pouring self-repairing slurry ingredients of which the material ingredients are 95% of ordinary portland cement and 5% of metal chelating agent, wherein the weight ratio of the material to the water is 1: and 0.7, grouting after stirring. The metal chelating agent adopts tetrasodium EDTA, and active groups contained in the EDTA have strong binding effect with metal ions.
7) During grouting, under the action of the first one-way valve 23, grout is firstly injected into the two end sacks 5 through the grout outlet. And (3) continuing grouting after the slurry of the bag 5 is filled, when the grouting pressure is greater than 0.5MPa, blasting the blast valve 22, and starting grouting into the middle sealing section until the slurry flows out of the slurry return pipe 4, which proves that the slurry in the sealing section is filled, and closing the second one-way valve 41 at the port of the slurry return pipe 4.
8) And after grouting is stopped, the grouting pipe 2 at the drilling hole is folded to be dead, the grouting pipe is fixed by an iron wire, the grouting pipe 2 is removed, and single-hole grouting is finished.
9) And after the slurry is solidified, connecting an extraction system, and periodically detecting parameters such as gas concentration, negative pressure, flow and the like of the gas extraction drill hole.
10) When the gas extraction concentration is reduced due to the fact that cracks appear on the wall surface around the drill hole or in the drill hole and cause gas leakage of the drill hole, CO is utilized2The foam spraying system 6 sprays CO to the wall surface of the surrounding rock of the drill hole2Foaming, using CO2The foam blocks the cracks and simultaneously utilizes the CO seeped in the cracks2The repairing effect of the self-repairing material is enhanced, and a large amount of insoluble crystals are promoted to be generated in the cracks, so that the cracks are plugged, and the gas extraction effect is improved.
As shown in FIGS. 2-3, the self-repairing crack mechanism utilized by the construction method of the present invention is a complex-precipitate reaction mechanism. The self-repairing slurry cement hydrates to generate a large amount of calcium hydroxide and C-S-H gel, and the C-S-H gel has a wrapping effect, so that part of the cement is not hydrated and substances with hydration activity are not reacted. When the material is stressed to generate cracks, the metal chelating agent can quickly occupy Ca at the cracks through chelating action2+And form unstable, readily water-soluble calcium complexes. The calcium complex solution diffuses in the crack, when the calcium complex meets the substances with higher activity, such as partially unhydrated cement, cement gel and the like, the more stable substances, such as silicate, aluminate and the like, can capture calcium ions to generate crystals insoluble in water so as to realize the solidificationAnd repairing the crack.
After the calcium complex loses calcium ions, the active groups in the metal chelating agent restore activity again. And once the plugging material has cracks and media such as water enter, active groups in the metal chelating agent can react at the cracks to generate new crystals to automatically repair the cracks, so that the structure has self-repairing capability.
Under the action of negative pressure in the extraction pipe, CO2CO sprayed to outer wall of surrounding rock at orifice of gas extraction drill hole by foam spraying system2Foam is "pumped" into the borehole through interconnected fracture channels around the borehole wall, CO2High Ca content in the foam entering the crevices2+Region participation in CaCO production3And also with the above-mentioned Ca-containing2+Reaction of the complex to form CaCO which is sparingly soluble3，Thereby realizing the repair of the crack.
Claims (7)
1.CO2The construction method for repairing the extracted borehole fracture by combining foam and self-repairing slurry is characterized by comprising the following steps of: the method comprises the following steps:
1) checking before hole sealing: checking the drilled hole to ensure that the drilled hole is complete and smooth;
2) correspondingly sleeving hole packers at the head end and the tail end of the gas drainage pipe, and fixing a bag of the hole packers on the gas drainage pipe;
3) the grouting pipe penetrates through the two bags and is fixed on the gas drainage pipe, and corresponding grout outlets are formed in the positions of the two bags by the grouting pipe; a blasting valve is arranged on the grouting pipe between the two bags and at the middle sealing end; the head of the slurry return pipe extends into the sealing end of the middle part and is fixed on the grouting pipe;
4) the gas drainage pipe with the fixed hole packer and the grouting pipe is conveyed to the preset coal hole depth together;
5) communicating a grouting pipe with a grouting pump of a grouting device, connecting the grouting device with an air source, and adjusting an air pressure valve of the grouting device;
6) pouring clear water into the grouting device, opening a stirrer of the grouting device, pouring self-repairing slurry ingredients mixed by portland cement and a metal chelating agent, and starting grouting after stirring is completed;
7) the slurry is firstly injected into the bag at the two ends through the slurry outlet, the grouting is continued after the bag slurry is filled to explode the explosion valve, the slurry is injected into the middle sealing section until the slurry flows out of the slurry return pipe, and at the moment, the second one-way valve at the port of the slurry return pipe is closed;
8) stopping grouting, blocking the grouting pipe at the drilling hole, removing the grouting pipe, and finishing single-hole grouting;
9) after the slurry is solidified, connecting an extraction system, and periodically detecting the gas concentration, the negative pressure and the flow of the gas extraction drill hole;
10) when the gas extraction concentration is reduced due to the fact that cracks appear on the wall surface around the drill hole or in the drill hole and cause gas leakage of the drill hole, CO is utilized2The foam spraying system sprays CO to the wall surface of the surrounding rock of the drill hole2Foam, CO2The foam penetrates into the crack and reacts with the self-repairing material to generate new crystals to automatically repair the crack.
2. The construction method according to claim 1, characterized in that: and step 2), the middle bag is fastened and fixed on the gas drainage pipe through an iron wire.
3. The construction method according to claim 1, characterized in that: and 3) a first one-way valve is arranged at the grout outlet of the grouting pipe corresponding to the bag.
4. The construction method according to claim 1, characterized in that: the material components of the slurry in the step 6) are 95 percent of ordinary portland cement and 5 percent of metal chelating agent.
5. The construction method according to claim 4, wherein: and 6), adopting EDTA tetrasodium as the metal chelating agent.
6. The construction method according to claim 4, wherein: the weight ratio of the materials to the water of the self-repairing slurry in the step 6) is 1: 0.7.
7. the construction method according to claim 1, characterized in that: the set explosion pressure value of the explosion valve in the step 7) is 0.5 MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062130.2A CN114320220A (en) | 2022-01-19 | 2022-01-19 | CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210062130.2A CN114320220A (en) | 2022-01-19 | 2022-01-19 | CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry |
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| CN114320220A true CN114320220A (en) | 2022-04-12 |
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|---|---|---|---|
| CN202210062130.2A Pending CN114320220A (en) | 2022-01-19 | 2022-01-19 | CO2Construction method for repairing extracted borehole fracture by combining foam and self-repairing slurry |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703299A (en) * | 2024-02-06 | 2024-03-15 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
| CN117703299B (en) * | 2024-02-06 | 2024-05-14 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117703299A (en) * | 2024-02-06 | 2024-03-15 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
| CN117703299B (en) * | 2024-02-06 | 2024-05-14 | 山东科技大学 | Visual sealing device and sealing method for gas extraction drilling |
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