CN115795909A - Gas pre-pumping working face extraction pipeline pipe diameter optimization design method - Google Patents
Gas pre-pumping working face extraction pipeline pipe diameter optimization design method Download PDFInfo
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Abstract
The invention relates to an optimized design method for the pipe diameter of an extraction pipeline of a gas pre-extraction working face, and belongs to the field of gas extraction. The design method comprises the following steps of S1: when the pipe diameter of an extraction branch pipe of a coal bed gas pre-extraction working face is designed, designing the working face in a segmented mode, and determining the number N of segments; s2: determining the length of a working face of each section of gas extraction branch pipe extraction service according to the number N of sections of the extraction branch pipe pipeline; s3: calculating the pure quantity of gas to be extracted of each section of pre-extraction working face and the quantity of mixed gas to be extracted of a pipeline in a standard state according to the designed working face parameters and the measured basic parameters of the gas of the coal seam of the working face; s4: and respectively calculating the pipe diameter of each section of the extraction branch pipe according to a calculation formula of the gas extraction pipeline. The method can more accurately divide the working face area of the extraction pipe service, and can solve the problems of high economic cost, poor extraction effect and the like caused by overlarge selection of the optimized extraction pipeline, thereby providing support in the aspect of the optimized design of the extraction system.
Description
Technical Field
The invention belongs to the field of gas extraction, and relates to a pipe diameter optimization design method for an extraction pipeline of a gas pre-extraction working face.
Background
Coal bed gas is used as a first killer of a coal mine, so that a large number of coal mine safety accidents are induced, the life and property safety of coal mine workers is seriously threatened, and the healthy development of the coal industry is restricted. The gas extraction is an effective measure for solving the prevention, control and utilization of coal mine gas disasters in China, and the design of a gas extraction system is more and more prominent in the gas extraction link. At present, a gas extraction system of a ground pump station mainly comprises a gas extraction pump, a gas extraction pipeline and matched auxiliary equipment, the investment cost of the gas extraction pipeline accounts for about 30% of the total investment of the gas extraction system, the gas extraction pipeline at the present stage is designed according to the design standard of gas extraction engineering, when the pipe diameter of an extraction branch pipe of a pre-extraction working face is designed, the pipe diameter of the extraction pipe is designed and calculated according to the gas extraction quantity of the whole pre-extraction working face, so that the most reasonable pipe diameter selection is not needed for a local working face area, the extraction effect is influenced, and meanwhile, the investment cost is overhigh due to the fact that the pipe diameter is designed to be too large.
Disclosure of Invention
In view of this, the invention aims to provide an optimized design method for the pipe diameter of an extraction pipeline of a gas pre-extraction working face, which is based on the sectional design of an extraction pipe of the pre-extraction working face, and optimizes and calculates the most reasonable pipe diameter of each section of the working face.
In order to achieve the purpose, the invention provides the following technical scheme:
the method comprises the following steps:
s1: when the pipe diameter of an extraction branch pipe of a coal bed gas pre-extraction working face is designed, designing the working face in a segmented mode, and determining the number N of segments;
s2: determining the length of a working face of each section of gas extraction branch pipe extraction service according to the number N of sections of the extraction branch pipe pipeline;
s3: calculating the pure quantity of gas to be extracted of each section of pre-extraction working face and the quantity of mixed gas to be extracted of a pipeline in a standard state according to the designed working face parameters and the measured basic parameters of the gas of the coal seam of the working face;
s4: and respectively calculating the pipe diameter of each section of the extraction branch pipe according to a gas extraction pipeline calculation formula.
Optionally, S1 specifically is: the number of segments N is divided according to the length of the pre-pumping working face. Generally, when the length of the working face is within 1km, N is 2-3; when the length of the working face is more than 1km, N is 4-5.
Optionally, the S2 specifically is: numbering the divided working face areas according to 1-N along the gas extraction direction, and equally dividing the length of each divided working face area according to the number of segments, wherein L = L 1 N, wherein L 1 Is the pre-pumping face length.
Optionally, S3 is specifically: calculating the gas extraction pure quantity Q of the working face area with the number of 1-N by adopting the following formula 1n ：
In the formula K n 、L 2n 、M、γ、W 0n 、W 1 And t is the gas extraction imbalance coefficient, the working face width, the average coal seam thickness, the coal density, the original gas content, the pre-pumping standard gas content and the pre-pumping time of the divided working face area respectively.
Calculating a value Q according to the gas extraction pure quantity 1n Calculating the quantity Q of mixed gas to be extracted from the pipeline in the standard state 2n ：
Q 2n ＝Q 1n /c
In the formula Q 2n The surplus coefficient should be 1.2-1.8; and c, designing the gas extraction concentration in the extraction pipe.
Optionally, the S4 specifically is: calculating a value Q according to the gas extraction pure quantity of each section of the working face 1n Calculating the mixed gas quantity Q of each pipeline in the quasi-state 2n And then calculating the inner diameter value of each section of the extraction pipeline as the basis for the optimized extraction pipeline pipe diameter model selection:
wherein V is an economic flow rate and can be 5m/s to 12m/s.
The invention has the beneficial effects that:
according to the method for optimally designing the pipe diameter of the gas pre-extraction working face extraction pipeline, the pre-extraction working face extraction pipeline is designed in sections, the working face area served by the extraction pipeline is divided more accurately, the gas quantity to be extracted of each section of the extraction pipeline is obtained, the reasonable pipe diameter of each section of the extraction pipeline of the working face is calculated, the problems of high economic cost, poor extraction effect and the like caused by overlarge selection of the extraction pipeline are solved, and therefore support is provided for the aspect of optimal design of an extraction system.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic diagram of the steps of the present invention.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1, a method for optimally designing the pipe diameter of an extraction pipeline of a gas pre-extraction working face is disclosed, which comprises the following steps:
s1: when the pipe diameter of an extraction branch pipe of a coal bed gas pre-extraction working face is designed, designing the working face in a segmented mode, and determining the number N of segments;
s2: determining the length of a working face of each section of gas extraction branch pipe extraction service according to the number N of sections of the extraction branch pipe pipeline;
s3: calculating the gas purity to be extracted of each section of the pre-extraction working face and the mixed gas amount to be extracted of the pipeline in a standard state according to the designed working face parameters and the measured basic parameters of the gas of the coal seam of the working face;
s4: and respectively calculating the pipe diameter of each section of the extraction branch pipe according to a gas extraction pipeline calculation formula.
Optionally, S1 specifically is: the number of segments N is divided according to the length of the pre-pumping working face. Generally, when the length of the working face is within 1km, N is 2-3; when the length of the working face is more than 1km, N is 4-5.
Optionally, the S2 specifically is: numbering the divided working face areas according to 1-N along the gas extraction direction, and equally dividing the length of each divided working face area according to the number of segments, wherein L = L 1 N, wherein L 1 Is the pre-pumping face length.
Optionally, the S3 specifically is: calculating the gas extraction pure quantity Q of the working face area with the number of 1-N by adopting the following formula 1n ：
In the formula K n 、L 2n 、M、γ、W 0n 、W 1 And t is the gas extraction unbalance coefficient, the working face width, the average coal seam thickness, the coal density, the original gas content, the pre-extraction standard gas content and the pre-extraction time of the divided working face area respectively.
Calculating a value Q according to the gas extraction pure quantity 1n And calculating the quantity Q of mixed gas to be extracted in the pipeline under the standard state 2n ：
Q 2n ＝Q 1n /c
In the formula Q 2n The surplus coefficient should be 1.2-1.8; and c, designing the gas extraction concentration in the extraction pipe.
Optionally, S4 specifically is: calculating a value Q according to the gas extraction pure quantity of each section of the working face 1n Calculating the mixed gas quantity Q of each pipeline in the quasi-state 2n And then calculating the inner diameter value of each section of the extraction pipeline as the basis for the optimized extraction pipeline pipe diameter model selection:
wherein V is an economic flow rate and can be 5m/s to 12m/s.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (8)
1. A gas pre-pumping working face extraction pipeline pipe diameter optimization design method is characterized by comprising the following steps:
s1: when the pipe diameter of an extraction branch pipe of a coal seam gas pre-extraction working face is designed, the working face is designed in sections, and the number N of sections of an extraction branch pipe pipeline is determined;
s2: determining the length of a working face of each section of gas extraction branch pipe extraction service according to the number N of sections of the extraction branch pipe pipeline;
s3: calculating the gas purity to be extracted of each section of the pre-extraction working face and the mixed gas amount to be extracted of the pipeline in a standard state according to the designed working face parameters and the measured basic parameters of the gas of the coal seam of the working face;
s4: and respectively calculating the pipe diameter of each section of the extraction branch pipe according to a gas extraction pipeline calculation formula.
2. The method for optimally designing the pipe diameter of the gas pre-extraction working face extraction pipeline according to claim 1, wherein S1 specifically comprises the following steps: the number of segments N is divided according to the length of the pre-pumping working face.
3. The method for optimally designing the pipe diameter of the gas extraction pipeline on the gas pre-extraction working face according to claim 2, wherein when the length of the working face is within 1km, N is 2-3; and when the length of the working face is more than 1km, taking N as 4-5.
4. The method for optimally designing the pipe diameter of the gas pre-extraction working face extraction pipeline according to claim 1, wherein S2 specifically comprises the following steps: numbering the divided working face areas along the gas extraction direction according to 1-N, equally dividing the length of each divided working face area according to the number of segments, and L = L 1 N, wherein L 1 Is the pre-pumping face length.
5. The method for optimally designing the pipe diameter of the gas pre-extraction working face extraction pipeline according to claim 1, wherein S3 specifically comprises the following steps: calculating the gas extraction pure quantity Q of the working face area with the number of 1-N by adopting the following formula 1n ：
In the formula K n 、L 2n 、M、γ、W 0n 、W 1 And t are each independentlyAnd dividing the gas extraction unbalanced coefficient, the working face width, the average coal seam thickness, the coal density, the original gas content, the pre-pumping standard gas content and the pre-pumping time of the working face area.
6. The method for optimally designing the pipe diameter of the gas extraction pipeline on the gas pre-extraction working face according to claim 5, characterized in that a value Q is calculated according to the gas extraction pure quantity 1n Calculating the quantity Q of mixed gas to be extracted from the pipeline in the standard state 2n ：
Q 2n ＝Q 1n /c
In the formula Q 2n The surplus coefficient should be 1.2-1.8; and c, designing the gas extraction concentration in the extraction pipe.
7. The method for optimally designing the pipe diameter of the gas pre-extraction working face extraction pipeline according to claim 1, wherein S4 specifically comprises the following steps: calculating a value Q according to the gas extraction pure quantity of each section of the working face 1n Calculating the mixed gas quantity Q of each pipeline in the standard state 2n And then calculating the inner diameter value of each section of the extraction pipeline as the basis for the model selection of the pipe diameter of the optimized extraction pipeline:
wherein V is the economic flow rate.
8. The method for optimally designing the pipe diameter of the gas extraction pipeline on the gas pre-extraction working face according to claim 7, wherein the economic flow velocity V can be 5-12 m/s.
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| EP2818897A2 (en) * | 2013-06-26 | 2014-12-31 | Baker Hughes Incorporated | Method and apparatus for estimating a parameter of a subsurface volume |
| CN106246141A (en) * | 2016-08-03 | 2016-12-21 | 中煤科工集团重庆研究院有限公司 | Drilling hole quantitative partition arrangement optimization method based on coal mine gas extraction yield prediction |
| CN109519211A (en) * | 2019-01-15 | 2019-03-26 | 中煤科工集团重庆研究院有限公司 | Method for extracting gas in mining area by using pre-extraction coal bed gas ground well |
| US20190338622A1 (en) * | 2018-05-02 | 2019-11-07 | Saudi Arabian Oil Company | Multi-period and dynamic long term planning optimization model for a network of gas oil separation plants (gosps) |
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| EP2818897A2 (en) * | 2013-06-26 | 2014-12-31 | Baker Hughes Incorporated | Method and apparatus for estimating a parameter of a subsurface volume |
| CN106246141A (en) * | 2016-08-03 | 2016-12-21 | 中煤科工集团重庆研究院有限公司 | Drilling hole quantitative partition arrangement optimization method based on coal mine gas extraction yield prediction |
| US20190338622A1 (en) * | 2018-05-02 | 2019-11-07 | Saudi Arabian Oil Company | Multi-period and dynamic long term planning optimization model for a network of gas oil separation plants (gosps) |
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