CN112761612A - Method for underground coal gasification by using waste coal bed gas well - Google Patents
Method for underground coal gasification by using waste coal bed gas well Download PDFInfo
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- CN112761612A CN112761612A CN202110016606.4A CN202110016606A CN112761612A CN 112761612 A CN112761612 A CN 112761612A CN 202110016606 A CN202110016606 A CN 202110016606A CN 112761612 A CN112761612 A CN 112761612A
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/295—Gasification of minerals, e.g. for producing mixtures of combustible gases
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
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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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimizing the spacing of wells
- E21B43/305—Specific pattern of wells, e.g. optimizing the spacing of wells comprising at least one inclined or horizontal well
Abstract
The invention provides a method for underground coal gasification by using a waste coal bed gas well, which comprises the following steps: arranging a communicating well according to the well type of the waste coal bed gas well; introducing mixed gas into the waste coal bed gas well or the communication well; igniting a coal bed, and extracting mixed natural gas generated by coal bed combustion from the waste coal bed gas well or the communication well. According to the method for underground coal gasification by using the waste coal-bed gas well, the communication well is arranged according to the well type of the waste coal-bed gas well so as to underground coal gasification, and the extracted mixed natural gas can be used for industry or civilian use, so that the waste coal-bed gas well is recycled; meanwhile, the efficiency of underground coal gasification is improved by reasonably arranging the communicating wells.
Description
Technical Field
The invention relates to the technical field of underground coal gasification, in particular to a method for underground coal gasification by using a waste coal bed gas well.
Background
The coal bed gas ground extraction is a coal bed gas resource utilization mode widely developed in recent years, but after the extraction is finished, the coal bed gas well with huge investment is sealed and discarded. Nearly 40% of coal resources in China belong to thin coal seams, deep coal seams and steeply inclined coal seams, and well mining economy and safety are poor, so that the coal resources cannot be utilized in a short period and even are abandoned. Underground coal gasification is a process in which coal located underground is burned in a controlled manner and combustible gas is produced by the thermal and chemical action of the coal. The underground coal gasification emphasizes the utilization of energy, is known as a new-generation coal mining technology, has epoch-making significance, and is particularly suitable for developing thin coal seams, deep coal seams and steeply inclined coal seams which cannot be exploited by coal miners. In the application of underground coal gasification technology, the drilling cost accounts for more than 1/3 of the total cost. How to upgrade and reform the existing coal bed gas well network and utilize the abandoned coal bed gas well to gasify the coal underground is a practical problem in coal mining.
Disclosure of Invention
The invention provides a method for underground coal gasification by using a waste coal-bed gas well, which is used for solving the defect of waste of the coal-bed gas well in the prior art.
The invention provides a method for underground coal gasification by using a waste coal bed gas well, which comprises the following steps: arranging a communicating well according to the well type of the waste coal bed gas well; introducing mixed gas into the waste coal bed gas well or the communication well; igniting a coal bed, and extracting mixed natural gas generated by coal bed combustion from the waste coal bed gas well or the communication well.
According to the method for underground coal gasification by using the waste coal-bed gas well, the step of arranging the communication well according to the well type of the waste coal-bed gas well further comprises the following steps of: and arranging a horizontal butt well between every two first straight wells along the extension direction of the minimum principal stress, and communicating the horizontal butt well with the two adjacent first straight wells.
The method for underground coal gasification by using the waste coal bed gas well further comprises the following steps: introducing mixed gas into the horizontal docking well; igniting the coal bed and extracting mixed natural gas from the first vertical well.
According to the method for underground coal gasification by using the waste coal-bed gas well, the step of arranging the communication well according to the well type of the waste coal-bed gas well further comprises the following steps of: and a second straight well is arranged between every two first straight wells along the extension direction of the minimum principal stress.
The method for underground coal gasification by using the waste coal bed gas well further comprises the following steps: introducing mixed gas into the second vertical well; igniting the coal bed and extracting mixed natural gas from the first vertical well.
According to the method for underground coal gasification by using the waste coal-bed gas well, the step of arranging the communication well according to the well type of the waste coal-bed gas well further comprises the following steps of: and arranging a plurality of third vertical wells at the target positions of the cluster wells, and respectively communicating the third vertical wells with each cluster well.
The method for underground coal gasification by using the waste coal bed gas well further comprises the following steps: introducing mixed gas into the cluster well; igniting the coal bed and extracting mixed natural gas from the third vertical well.
According to the method for underground coal gasification by using the waste coal-bed gas well, the step of arranging the communication well according to the well type of the waste coal-bed gas well further comprises the following steps of: arranging a plurality of fourth vertical wells at target positions of the multi-branch horizontal well, and respectively communicating the fourth vertical wells with the multi-branch horizontal well; introducing mixed gas into the multi-branch horizontal well; igniting the coal bed, and extracting mixed natural gas from the fourth vertical well.
The method for underground coal gasification by using the waste coal bed gas well further comprises the following steps: introducing mixed gas into a horizontal well of the U-shaped butt joint well; igniting the coal bed, and extracting mixed natural gas from the vertical well of the U-shaped butt-jointed well.
The method for underground coal gasification by using the waste coal bed gas well further comprises the following steps: gasifying at the bottom of the well by adopting a retreating air supply ignition technology.
According to the method for underground coal gasification by using the waste coal-bed gas well, the communication well is arranged according to the well type of the waste coal-bed gas well so as to underground coal gasification, and the extracted mixed natural gas can be used for industry or civilian use, so that the waste coal-bed gas well is recycled; meanwhile, the efficiency of underground coal gasification is improved by reasonably arranging the communicating wells.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for underground coal gasification using a abandoned coal bed gas well according to the present invention;
FIG. 2 is a plan view of an arrangement of a abandoned coal bed gas well and a communication well;
FIG. 3 is one of the schematic views of a abandoned coal seam gas well and a communication well arrangement;
FIG. 4 is a second schematic diagram of the arrangement of the abandoned coal bed gas well and the communication well;
FIG. 5 is a third schematic diagram of the arrangement of the abandoned coal bed gas well and the communication well;
FIG. 6 is a fourth schematic diagram of the arrangement of the abandoned coal bed gas well and the communication well;
FIG. 7 is a fifth schematic diagram of the arrangement of the abandoned coal bed gas well and the communication well;
reference numerals:
10: a first vertical well; 11: horizontally butting the wells; 12: a second vertical well;
13: a cluster well; 14: a third vertical well; 15: a U-shaped butt well;
16: a multi-branch horizontal well; 17: a fourth vertical well; 20: a coal seam.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. 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.
The method for underground coal gasification using a abandoned coal bed gas well according to the present invention will be described with reference to fig. 1 to 6.
As shown in fig. 1, in an embodiment of the present invention, a method for underground coal gasification using a abandoned coal bed gas well specifically includes the following steps:
step 01: and arranging a communicating well according to the well type of the waste coal bed gas well.
Specifically, the pattern of the coal bed gas well pattern is usually rectangular pattern, diamond pattern and quincunx pattern. In a rectangular pattern, a square pattern is a special form thereof. The well spacing between two adjacent coal-bed gas wells in the well pattern is usually 300-500m, and the length of a crack half seam is usually about 150m after the coal-bed gas is fractured. At present, most of coal bed gas well patterns in China are arranged in a 300 x 350m mode, wherein the 350m direction is the fracturing fracture leading direction, and most of the 350m direction extends along the direction perpendicular to the minimum principal stress.
Common well types of the coal bed gas well comprise a vertical well, a cluster well and a horizontal well, and different communicating wells can be arranged according to different well types so as to be communicated with the waste coal bed gas well.
Specifically, for a vertical well, a horizontal butt well or a vertical well can be arranged between two vertical wells along the extension direction of the minimum principal stress so as to be communicated with the abandoned vertical well; for the cluster well, a vertical well can be arranged and communicated with the cluster well; for horizontal wells, the horizontal wells comprise U-shaped butt-jointed wells and multi-branch horizontal wells, and no communication well is required to be additionally arranged for the U-shaped butt-jointed wells; for the multi-branch horizontal well, the vertical well can be communicated with the multi-branch horizontal well
And step 02 and 03: and introducing mixed gas into the waste coal bed gas well or the communication well, igniting the coal bed 20, and extracting mixed natural gas generated by the combustion of the coal bed 20 from the waste coal bed gas well or the communication well.
Specifically, when the waste coal bed gas well is a vertical well, when a horizontal butt well is arranged between the two vertical wells, the horizontal butt well can be used as a gas well, mixed gas required by coal gasification is introduced into the horizontal butt well, the coal bed 20 is ignited, and the vertical well is used as a gas well for extracting mixed natural gas generated by coal combustion; when the vertical well is arranged between the two vertical wells, the vertical well arranged later can be used as a gas well, mixed gas required by coal gasification is introduced into the gas well, the coal bed 20 is ignited, and the waste vertical well can be used as a gas well for extracting mixed natural gas generated by coal combustion.
When the waste coal bed gas well is a cluster well, a vertical well can be arranged near each cluster well to be communicated with the cluster well, wherein the cluster well is a gas inlet well, mixed gas required by coal gasification is introduced, the coal bed 20 is ignited, and the vertical well is a gas outlet well and is used for extracting mixed natural gas generated by coal combustion.
For the horizontal well, specifically, for the U-shaped butt well, the horizontal well part of the U-shaped butt well can be used as a gas inlet well, mixed gas required for coal gasification is introduced, the coal seam 20 is ignited, and the vertical well is used as a gas well for extracting mixed natural gas generated by coal combustion. For the multi-branch horizontal well, the multi-branch horizontal well can be used as a gas well, mixed gas required by coal gasification is introduced, the coal bed 20 is ignited, and the vertical well is used as a gas well for extracting mixed natural gas generated by coal combustion.
Furthermore, before a communicating well is arranged according to the well type of the waste coal bed gas well, equipment such as underground television imaging and drift diameter gauges are adopted to check whether foreign matters and sediment exist in the coal bed gas well; whether the sleeve is deformed or broken. The method comprises the steps of selecting a drill hole with a complete sleeve and a complete well body structure, fishing foreign matters in the well by means of sand fishing, well washing, well repairing and the like, cleaning sediment at the well position, dredging the periphery of the well shaft and the near well shaft and ensuring the connectivity of the well shaft and the near well shaft.
According to the method for underground coal gasification by using the waste coal-bed gas well, the communication well is arranged according to the well type of the waste coal-bed gas well so as to underground coal gasification, and the extracted mixed natural gas can be used for industry or civilian use, so that the waste coal-bed gas well is recycled; meanwhile, the efficiency of underground coal gasification is improved by reasonably arranging the communicating wells.
As shown in fig. 2 and 3, in an embodiment of the present invention, the step of arranging the communication well according to the well type of the abandoned coal bed gas well further comprises: along the extension direction of the minimum principal stress, a horizontal butt well 11 is arranged between every two first straight wells 10, and the horizontal butt well 11 is communicated with the two adjacent first straight wells 10.
Specifically, taking a rectangular well pattern as an example, for a vertical well pattern, along the extension direction of the minimum principal stress, one horizontal butt well 11 is arranged between every two first straight wells 10 in two opposite directions and is communicated with two adjacent first straight wells 10. Because the first straight well 10 fractures the coal seam 20 during extraction, the pore connectivity in the coal seam 20 is good, and gasification and ventilation are facilitated. The horizontal butt-joint well 11 is used as an inlet gas well, mixed gas required by coal gasification is introduced into the horizontal butt-joint well 11 by utilizing a backward air supply ignition technology at the bottom of the well, a coal seam 20 is ignited, the first straight well 10 is used as a gas well, and mixed natural gas generated by underground coal combustion is extracted.
As shown in fig. 4, in an embodiment of the present invention, the step of arranging the communication well according to the well type of the abandoned coal bed gas well further includes: a second straight well 12 is arranged between every two first straight wells 10 in the direction of extension of the least principal stress.
In particular, for a pattern of vertical wells, it is also possible to provide one second vertical well 12 between every two first vertical wells 10 in the direction of least principal stress extension. When the second vertical well 12 is used as a gas well, mixed gas required by coal gasification is introduced into the second vertical well 12 by utilizing a backward air supply ignition technology at the bottom of the well, a coal seam 20 is ignited, and when the first vertical well 10 is used as a gas well, mixed natural gas generated by underground coal combustion is extracted.
As shown in fig. 5, in an embodiment of the present invention, the step of arranging the communication well according to the well type of the abandoned coal bed gas well further comprises: a third vertical well 14 is arranged at the target position of the cluster well 13, and a plurality of third vertical wells 14 are respectively communicated with each cluster well 13.
Specifically, for the cluster well 13 type, a plurality of third vertical wells 14 may be disposed at the target point of the cluster well 13, and each third vertical well 14 is respectively communicated with one cluster well 13. Wherein, the cluster well 13 is used as an inlet gas well, mixed gas required by coal gasification is introduced into the cluster well 13 by utilizing a backward air supply ignition technology at the bottom of the well, a coal bed 20 is ignited, the third vertical well 14 is used as a gas well, and mixed natural gas generated by underground combustion of coal is extracted.
As shown in fig. 7, in an embodiment of the present invention, the step of arranging the communication well according to the well type of the abandoned coal bed gas well further includes: and a plurality of fourth vertical wells 17 are arranged at the target point positions of the multi-branch horizontal well 16 and are respectively communicated with the multi-branch horizontal well 16.
Specifically, for horizontal wells, including multi-lateral horizontal well 16 and U-shaped butt well 15, for multi-lateral horizontal well 16, a plurality of fourth vertical wells 17 may be provided at the surface extending to the target downhole location of multi-lateral horizontal well 16 to communicate with each horizontal well section of multi-lateral horizontal well 16. The multi-branch horizontal well 16 is used as an inlet gas well, mixed gas required by coal gasification is introduced into the multi-branch horizontal well 16 by utilizing a backward air supply ignition technology at the bottom of the well, a coal seam 20 is ignited, the fourth vertical well 17 is used as a gas well, and mixed natural gas generated by underground coal combustion is extracted.
In one embodiment of the present invention, as shown in fig. 6, the method for underground coal gasification using a abandoned coal bed gas well further comprises the following steps: and introducing mixed gas into the horizontal well of the U-shaped butt-jointed well 15, igniting the coal seam 20, and extracting the mixed natural gas from the vertical well of the U-shaped butt-jointed well 15.
Specifically, for the U-shaped butt joint well 15, the horizontal well part of the U-shaped butt joint well 15 can be used as a gas inlet well, the vertical well part can be used as a gas well, the mixed gas required by coal gasification is introduced into the horizontal well of the U-shaped butt joint well 15 by utilizing the backward air supply ignition technology at the bottom of the well, the coal bed 20 is ignited, the vertical well part of the U-shaped butt joint well 15 is used as a gas well, and the mixed natural gas generated by underground coal combustion is extracted.
It should be noted that: the method for arranging the communication wells according to the well type of the waste coal bed gas well is also suitable for the diamond-shaped well pattern and the quincunx-shaped well pattern, and the arrangement mode of the communication wells is the same as that of the rectangular well pattern, so that the communication wells are not described again.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for underground coal gasification by using a waste coal bed gas well is characterized by comprising the following steps:
arranging a communicating well according to the well type of the waste coal bed gas well;
introducing mixed gas into the waste coal bed gas well or the communication well;
igniting a coal bed, and extracting mixed natural gas generated by coal bed combustion from the waste coal bed gas well or the communication well.
2. The method for underground coal gasification using the abandoned coal-bed gas well as recited in claim 1, wherein the step of providing the communication well according to the well type of the abandoned coal-bed gas well further comprises:
and arranging a horizontal butt well between every two first straight wells along the extension direction of the minimum principal stress, and communicating the horizontal butt well with the two adjacent first straight wells.
3. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 2, further comprising:
introducing mixed gas into the horizontal docking well; igniting the coal bed and extracting mixed natural gas from the first vertical well.
4. The method for underground coal gasification using the abandoned coal-bed gas well as recited in claim 1, wherein the step of providing the communication well according to the well type of the abandoned coal-bed gas well further comprises:
and a second straight well is arranged between every two first straight wells along the extension direction of the minimum principal stress.
5. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 4, further comprising:
introducing mixed gas into the second vertical well; igniting the coal bed and extracting mixed natural gas from the first vertical well.
6. The method for underground coal gasification using the abandoned coal-bed gas well as recited in claim 1, wherein the step of providing the communication well according to the well type of the abandoned coal-bed gas well further comprises:
and arranging a plurality of third vertical wells at the target positions of the cluster wells, and respectively communicating the third vertical wells with each cluster well.
7. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 6, further comprising:
introducing mixed gas into the cluster well; igniting the coal bed and extracting mixed natural gas from the third vertical well.
8. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 1, further comprising:
arranging a plurality of fourth vertical wells at target positions of the multi-branch horizontal well, and respectively communicating the fourth vertical wells with the multi-branch horizontal well;
introducing mixed gas into the multi-branch horizontal well; igniting the coal bed, and extracting mixed natural gas from the fourth vertical well.
9. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 1, further comprising:
introducing mixed gas into a horizontal well of the U-shaped butt joint well; igniting the coal bed, and extracting mixed natural gas from the vertical well of the U-shaped butt-jointed well.
10. The method for underground coal gasification using abandoned coal-bed gas wells as claimed in claim 1, further comprising:
gasifying at the bottom of the well by adopting a retreating air supply ignition technology.
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Cited By (2)
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| CN114412433A (en) * | 2022-01-20 | 2022-04-29 | 中国矿业大学 | Deep coal in-situ fluidization mining method based on heat extraction power generation |
| US20230126834A1 (en) * | 2021-10-21 | 2023-04-27 | Southwest Petroleum University | Integrated method and structure for in-situ hydrogen production from coal seams and coalbed methane exploitation |
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| US20230126834A1 (en) * | 2021-10-21 | 2023-04-27 | Southwest Petroleum University | Integrated method and structure for in-situ hydrogen production from coal seams and coalbed methane exploitation |
| CN114412433A (en) * | 2022-01-20 | 2022-04-29 | 中国矿业大学 | Deep coal in-situ fluidization mining method based on heat extraction power generation |
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