CN114876460B - Method for realizing fluidization exploitation by in-situ oxidative degradation of deep coal - Google Patents
Method for realizing fluidization exploitation by in-situ oxidative degradation of deep coal Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 24
- 238000005243 fluidization Methods 0.000 title claims abstract description 18
- 238000010525 oxidative degradation reaction Methods 0.000 title claims abstract description 18
- 239000007800 oxidant agent Substances 0.000 claims abstract description 41
- 230000001590 oxidative effect Effects 0.000 claims abstract description 38
- 239000000243 solution Substances 0.000 claims abstract description 35
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 238000005065 mining Methods 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 16
- 230000003647 oxidation Effects 0.000 claims abstract description 15
- 238000005553 drilling Methods 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 30
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 10
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 10
- 239000007787 solid Substances 0.000 claims description 7
- 125000003118 aryl group Chemical group 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000009933 burial Methods 0.000 claims description 3
- 238000005485 electric heating Methods 0.000 claims description 2
- 150000001735 carboxylic acids Chemical class 0.000 claims 2
- 238000000605 extraction Methods 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000002309 gasification Methods 0.000 description 5
- KFSLWBXXFJQRDL-UHFFFAOYSA-N Peracetic acid Chemical compound CC(=O)OO KFSLWBXXFJQRDL-UHFFFAOYSA-N 0.000 description 4
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 238000005213 imbibition Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000002269 spontaneous effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- YZCKVEUIGOORGS-IGMARMGPSA-N Protium Chemical compound [1H] YZCKVEUIGOORGS-IGMARMGPSA-N 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- WPYMKLBDIGXBTP-UHFFFAOYSA-N benzoic acid Chemical compound OC(=O)C1=CC=CC=C1 WPYMKLBDIGXBTP-UHFFFAOYSA-N 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 125000006575 electron-withdrawing group Chemical group 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 150000002390 heteroarenes Chemical class 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- -1 nitro, carboxyl Chemical group 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- 238000002310 reflectometry Methods 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 239000004079 vitrinite Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Remote Sensing (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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- Production Of Liquid Hydrocarbon Mixture For Refining Petroleum (AREA)
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Abstract
The invention belongs to the technical field of fluidized mining by in-situ oxidative degradation of coal, and provides a method for realizing fluidized mining by in-situ oxidative degradation of deep coal, which comprises the following steps: step 1, drilling two horizontal wells in a coal bed to be fluidicly exploited, wherein a liquid injection well is drilled above, and a exploiting well is drilled below; step 2, carrying out hydraulic fracturing on the coal bed between the liquid injection well and the exploitation well until the coal bed forms a fracture seepage channel; step 3, injecting an oxidant solution into the coal seam through the liquid injection well to enable the oxidant solution to generate an oxidation effect with the coal seam and generate a fluidization product; and 4, producing fluidized products from the production well. The invention provides a new thought of coal seam oxidation fluidization, which provides a reference for coal seam oxidation fluidization exploitation. The method has the advantages of mild applicable conditions, low equipment requirement, simple operation process and low economic cost.
Description
Technical Field
The invention belongs to the technical field of fluidized mining by in-situ oxidative degradation of coal, and particularly relates to a method for realizing fluidized mining by in-situ oxidative degradation of deep coal.
Background
Coal will still be the main energy and basic energy of our country in a quite long period in the future, but nearly 70% of coal resources of our country are distributed below 2000m, so deep coal resource exploitation is imperative. However, the mining depth of solid minerals cannot extend to deep infinitely according to the existing mining mode and the mining technology, and the conventional mining mode and the current technology are insufficient to support deep solid resource mining.
In order to solve the problem of extreme depth in the traditional coal exploitation mode and solve the problems of safety and environment in the deep coal resource exploitation process, a group of scholars propose the concept of deep coal resource in-situ fluidization exploitation. The fluidized exploitation refers to an exploitation technical system for converting deep solid mineral resources into fluidized resources such as gas, liquid or gas-solid-liquid mixed state in situ and realizing unmanned intelligent exploitation, selection, charging, thermoelectric conversion and the like under the well.
Common fluidization mining techniques such as: deep in-situ energy-induced physical crushing fluidization exploitation technology: deep high stress is utilized to induce deep coal to protrude to form mixed fluid substances such as particle flow, gas, liquid and the like by drilling and water jet rock breaking, so as to form particle size conforming to pipeline transmission, but harmful disturbance can be generated in the process of induced cracking; such as: the in-situ gasification technology for deep coal fluidization exploitation is an important way for deep coal in-situ fluidization exploitation, and the underground coal gasification can convert the coal into fuel gas to be output to the ground. However, the technology needs to establish a gasification bin in the goaf, and has higher gasification condition requirements, so that the exploitation cost can be increased.
In the above, the technical content of oxidizing coal in situ by injecting an oxidant into a coal bed and directly mining fluidized products is not related, and a fluidized mining method for in-situ oxidative degradation of deep coal is provided.
Disclosure of Invention
The invention aims to solve the problems recorded in the background technology and provides a method for realizing fluidized mining by in-situ oxidative degradation of deep coal.
In order to achieve the above purpose, the invention adopts the following technical scheme: a fluidized mining method for deep coal in-situ oxidative degradation comprises the following steps:
step 1, drilling two horizontal wells in a coal bed to be fluidicly exploited, wherein a liquid injection well is drilled above, and a exploiting well is drilled below;
step 2, carrying out hydraulic fracturing on the coal bed between the liquid injection well and the exploitation well until the coal bed forms a fracture seepage channel;
step 3, injecting an oxidant solution into the coal seam through the liquid injection well to enable the oxidant solution to generate an oxidation effect with the coal seam and generate a fluidization product;
and 4, producing fluidized products from the production well.
In a preferred embodiment of the present invention, in step 1, the coal seam is a low rank coal seam having a depth of burial of 500 to 800 m.
In a preferred embodiment of the present invention, in step 1, after the injection well is drilled, a first high pressure pump is installed at the wellhead of the injection well, a heating device and a second high pressure pump are installed in the well of the injection well, the first high pressure pump is communicated with the heating device, and the heating device is communicated with the second high pressure pump.
In a preferred embodiment of the present invention, in step 3, the first high pressure pump provides initial power to inject the oxidant solution into the heating device, the oxidant solution is heated to 40-200 ℃ by the electric heating device, and then the heated oxidant solution is injected into the coal seam by the second high pressure pump.
In a preferred embodiment of the present invention, in step 3, the oxidizing agent solution is formulated by dissolving a solid or liquid oxidizing agent having strong oxidizing property in water.
In a preferred embodiment of the invention, in step 3, the oxidizing agent solution comprises sodium hypochlorite in a mass concentration of 1 to 6% or 15 to 30% hydrogen peroxide and 6% acetic acid.
In a preferred embodiment of the present invention, in step 3, 6% acetic acid is injected into the coal seam, followed by 15-30% hydrogen peroxide, or 1-6% sodium hypochlorite is directly injected into the coal seam.
In a preferred embodiment of the invention, the oxidation time is from 1d to 7d.
In a preferred embodiment of the invention, in step 1, the pressure used for hydraulic fracturing is below 20MPa.
In a preferred embodiment of the invention, in step 4, the fluidized product is extracted and then further separated and refined to obtain the non-energy chemical product.
The principle and the beneficial effects of the invention are as follows: 1. the oxidant selected by the method can react with the aromatic structure in the coal to degrade the coal into water-soluble compounds (carboxylic acid and the like), so that the method is widely applicable to low-order coal seams with vitrinite reflectivity less than or equal to 0.65%.
2. Through the oxidation reaction of the oxidant and the coal body, at least 20% of solid carbon can be converted in situ, and the efficiency is high.
3. The method is combined with hydraulic fracturing, and partial oxidant solution in the injection well can be diffused to the periphery of the coal seam through the original fracture of the coal seam, the fracture generated by hydraulic fracturing and a spontaneous imbibition mode. The seepage velocity of the injected oxidant solution and the seepage velocity of the fluidized product can be improved, thereby improving the reaction rate.
4. The new thought of coal seam oxidation fluidization is provided, and a reference is provided for coal seam oxidation fluidization exploitation.
5. The method has the advantages of mild applicable conditions, low equipment requirement, simple operation process and low economic cost.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of a coal seam for realizing a fluidized mining method by in-situ oxidative degradation of deep coal.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.
In the description of the present invention, it should be understood that the terms "longitudinal," "transverse," "vertical," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be configured and operated in a particular orientation, and thus should not be construed as limiting the invention.
In the description of the present invention, unless otherwise specified and defined, it should be noted that the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, mechanical or electrical, or may be in communication with each other between two elements, directly or indirectly through intermediaries, as would be understood by those skilled in the art, in view of the specific meaning of the terms described above.
The application provides a fluidized mining method for realizing in-situ oxidative degradation of deep coal, which comprises the following steps:
step 1, as shown in figure 1, according to geological features and the prior construction technology, two horizontal wells are drilled in a coal seam to be fluidicly exploited (the coal seam is a low-rank coal seam with the burial depth of 500-800 m), one of the horizontal wells is a liquid injection well positioned above the coal seam to be exploited, the other horizontal well is a fluidized product exploiting well positioned below the coal seam to be exploited, after the liquid injection well is drilled out, a first high-pressure pump is arranged at the wellhead of the liquid injection well, a heating device and a second high-pressure pump are arranged underground the liquid injection well, the first high-pressure pump is communicated with the heating device, and the heating device is communicated with the second high-pressure pump.
And 2, carrying out hydraulic fracturing on the coal bed between the liquid injection well and the exploitation well, wherein the pressure used for hydraulic fracturing is lower than 20MPa until a fracture seepage channel is formed in the coal bed.
And 3, injecting the oxidant solution into the heating device by providing initial power by the first high-pressure pump, heating to 40-200 ℃ by the heating device, and injecting the heated oxidant solution into the coal seam by the second high-pressure pump, so that the oxidant solution and the coal seam generate oxidation and generate fluidized products, wherein the oxidation time is 1-7 d in the embodiment. In this embodiment, the oxidizing agent solution is prepared by dissolving a solid or liquid oxidizing agent with strong oxidizing property in water, and in this embodiment, the oxidizing agent solution includes sodium hypochlorite with a mass concentration of 1-6% or hydrogen peroxide with a mass concentration of 15-30% and acetic acid with a mass concentration of 6%. When the method is specifically used for injection, 6% of acetic acid is injected into the coal seam, then 15-30% of hydrogen peroxide is injected into the coal seam, and the two solutions can generate peroxyacetic acid in the stratum, so that the peroxyacetic acid has higher oxidizing property than that of the hydrogen peroxide of 30% alone; the sodium hypochlorite with the concentration of 1-6% can be directly injected (the injection process is the working flow of the first high-pressure pump, the heating device and the second high-pressure pump). Part of the oxidizer solution in the injection well may diffuse around the coal seam by way of the original fractures of the coal seam, fractures created by hydraulic fracturing, and spontaneous imbibition.
In this example, the oxidative degradation process of coal is as follows:
sodium hypochlorite: heteroaromatics, some aromatics with electron withdrawing groups (such as carboxyl, nitro, carboxyl, etc.), can form resonance structures that stabilize carbanions and are susceptible to oxidation by sodium hypochlorite. Sodium hypochlorite is prone to attack carbon atoms containing acidic hydrogen, and these compounds form stable carbanions upon loss of hydrogen. Therefore, the phenol structure in the coal can generate chloro-compounds through a series of reactions such as chloro-substitution, hydrolysis, ring opening and the like; various aromatic ring-containing structures can be oxidized and opened to generate aromatic acid.
acetic acid is an organic reagent, can better dissolve organic matters in coal, contacts more oxidation active sites, and enables oxidative degradation to be more sufficient, so that hydrogen peroxide and acetic acid can be used together to decompose an aromatic ring structure. Therefore, in this embodiment, the oxidant solution adopts sodium hypochlorite or acetic acid and hydrogen peroxide, which is environment-friendly and does not damage the coal seam. The oxidant solution can react with aromatic structures in coal, so that the method is suitable for the oxidation fluidization of low-rank coal beds. The small-scale low-pressure hydraulic fracturing modification of the fluidized mining coal bed is performed before the injection of the oxidant solution, so that the seepage speed of the injected oxidant solution and the seepage speed of fluidized products are improved, and the reaction rate of the oxidant solution and the coal is improved (the contact area between the oxidant solution and the coal bed is enlarged by the fracturing of the coal bed, and the reaction rate is further improved).
And 4, exploiting the fluidized product through a exploitation well, and further separating and refining the fluidized product after exploitation, namely separating the oxidant solution, the fracturing fluid and the like remained in the fluidized product, and finally obtaining the non-energy chemical products with high added value such as carboxylic acid and the like.
In summary, the method comprises the steps of carrying out small-scale low-pressure fracturing transformation on the coal seam, forming a crack seepage channel between the liquid injection well and the exploitation well, then injecting an oxidant solution into the underground coal seam to act with coal, outputting the produced fluidized products, fine particles and an unreacted solution together from a shaft of the exploitation well to the ground, and further separating and refining to obtain non-energy chemical products with high added value such as carboxylic acid, thereby realizing non-energy utilization of deep coal.
According to the method, the oxidant solution injected into the coal seam is heated to the specified temperature through the underground heating device, the high temperature can improve the oxidation rate, and meanwhile, the oxidant can be suitable for coal seams with different buries.
Compared with the physical crushing fluidization exploitation technology and the deep coal fluidization exploitation in-situ gasification technology, the method has the advantages of mild field application conditions, low technical difficulty and the like, and is not limited by the geological structure conditions of the coal bed, the damage of the top and bottom plates or the surrounding rock of the roadway, the hardness of the coal body and the like.
Compared with a fluidization loop mining structure and method applicable to deep coal resources in the prior art 202010156902.X, the method has the advantages that how to fluidize coal is clarified, meanwhile, the setting of a transfer station is reduced, and the mining cost is reduced.
In the description of the present specification, reference to the terms "preferred implementation," "one embodiment," "some embodiments," "example," "a particular example" or "some examples" and the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. The method for realizing fluidized mining by in-situ oxidative degradation of deep coal is characterized by comprising the following steps of:
step 1, drilling two horizontal wells in a coal bed to be fluidicly exploited, wherein a liquid injection well is drilled above, and a exploiting well is drilled below; after a liquid injection well is drilled, a first high-pressure pump is arranged at a wellhead of the liquid injection well, a heating device and a second high-pressure pump are arranged in the well of the liquid injection well, the first high-pressure pump is communicated with the heating device, and the heating device is communicated with the second high-pressure pump;
step 2, carrying out hydraulic fracturing on the coal bed between the liquid injection well and the exploitation well until the coal bed forms a fracture seepage channel;
step 3, injecting an oxidant solution into the coal seam through the liquid injection well to enable the oxidant solution to generate an oxidation effect with the coal seam and generate a fluidization product; the first high-pressure pump provides initial power to inject the oxidant solution into the heating device, the oxidant solution is heated to 40-200 ℃ through the electric heating device, and the heated oxidant solution is injected into the coal seam through the second high-pressure pump; the oxidant solution is prepared by dissolving solid or liquid oxidant with strong oxidizing property in water; in the step 3, the oxidant solution comprises sodium hypochlorite with the mass concentration of 1-6% or hydrogen peroxide with the mass concentration of 15-30% and acetic acid with the mass concentration of 6%; or firstly injecting 6% acetic acid into the coal bed, then injecting 15-30% hydrogen peroxide into the coal bed, or directly injecting 1-6% sodium hypochlorite into the coal bed; the oxidizing agent is capable of reacting with aromatic structures in the coal to degrade the coal into carboxylic acids;
and 4, extracting fluidized products from the extraction well to finally obtain the carboxylic acid.
2. The method for realizing fluidized mining by in-situ oxidative degradation of deep coal as claimed in claim 1, wherein in the step 1, the coal seam is a low-rank coal seam with a burial depth of 500-800 m.
3. The method for achieving fluidized mining through in-situ oxidative degradation of deep coal as claimed in claim 2, wherein the oxidation time is 1d to 7d.
4. The method for realizing fluidized mining by in-situ oxidative degradation of deep coal as claimed in claim 1, wherein in the step 1, the pressure used for hydraulic fracturing is lower than 20MPa.
5. The method for realizing fluidized mining by in-situ oxidative degradation of deep coal according to claim 1, wherein in step 4, fluidized products are further separated and refined after mining, and non-energy chemical products are obtained.
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CN110924919A (en) * | 2019-12-11 | 2020-03-27 | 中国矿业大学 | Method for increasing production of coal bed gas by waste heat in underground coal gasification process |
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