CN111502740A - Unit circulating type pressure pumping integrated gas extraction system and method - Google Patents
Unit circulating type pressure pumping integrated gas extraction system and method Download PDFInfo
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Abstract
The invention provides a unit circulating type pressure-pumping integrated gas extraction system and a method, which comprises the following steps: the device comprises a gas supercharging device, a high-pressure gas storage regulation and control device, a pressure pumping collecting pipe and a plurality of pressure pumping units distributed in a coal seam; each pressure and suction unit comprises: each pressure pumping unit is correspondingly provided with two pressure pumping collecting pipes which are respectively connected with a main pumping pipeline and a high-pressure gas storage regulation and control device; the high-pressure gas storage regulation and control device is connected with the gas supercharging device; and the gas supercharging device is connected with an underground compressed air pipeline. The hysteresis effect of improving the gas extraction efficiency by using the pressure injection air is utilized to perform circulating pressure injection-extraction on different pressure extraction units of the coal seam, so that the gas extraction efficiency is improved, the use efficiency of high-pressure gas and the gas extraction concentration are improved, and the gas extraction effect is more uniform.
Description
Technical Field
The invention relates to the technical field of coal mine gas enhanced extraction, in particular to a unit circulation type pressure extraction integrated gas extraction system and method, which are mainly suitable for coal mines needing to improve extraction efficiency.
Background
The extraction drill hole can go deep into the coal seam, the gas pressure in the drill hole is kept in a lower state under the action of extraction negative pressure, a certain pressure gradient difference is formed between the gas pressure and the coal body around the drill hole, free gas in the inter-block cracks is promoted to flow to the extraction drill hole, adsorbed gas is desorbed, and the free gas in the cracks is supplemented. Because the relationship between the coal seam gas pressure and the coal seam gas content conforms to the typical langmuir type, the coal seam gas content in the low-pressure stage is still high, and the safety recovery of the coal face is threatened. However, with the gradual reduction of the gas pressure of the coal seam, the gas pressure gradient between the extracted coal body and the extraction drill hole is greatly reduced, so that the 'gas flow driving force' is insufficient, and the extraction quantity in the later extraction period is quickly attenuated.
At present, the pressure-drainage integration technology, also called as a displacement technology, injects other gas higher than the coal seam gas pressure into the coal seam through a part of drill holes, extracts the gas from a part of drill holes, increases the gas flowing power between the pressure-injection drill holes and the extraction drill holes, improves the mixed gas pressure gradient in the cracks to drive the crack gas to move, and simultaneously uses the competitive adsorption action of the injected gas to promote the adsorbed gas to be desorbed and diffused.
The patent and other related researches are beneficial to the development of pressure pumping integrated engineering application under a coal mine, but the issued patents and technical methods all adopt the concept of continuous pressure injection, and the continuous pressure injection process has three obvious disadvantages:
(1) the capacity of devices such as underground compressed air and pressurization is limited, the air source of underground pressure pumping integrated engineering is relatively limited, and the consumption of the air source is large due to continuous pressure injection, so that the technology is difficult to service large-area coal seams;
(2) gas continuously injected for a long time finally flows to the extraction drill hole through the injection drill hole, so that the gas extraction concentration is continuously reduced, the gas is a precious clean energy, and the economic value of the gas is rapidly reduced when the gas concentration is lower than 5%;
(3) the constant arrangement of the pressure injection hole and the extraction hole always enables the gas content of the coal body on the periphery of the pressure injection hole to be very low, the gas content of the coal body on the periphery of the extraction hole is maintained at a higher level, and the extraction effect of pressure injection extraction is not uniform.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a unit circulating type pressure-extraction integrated gas extraction system and a unit circulating type pressure-extraction integrated gas extraction method, wherein the hysteresis effect of the pressure-injection air for improving the gas extraction efficiency is utilized, and circulating type pressure injection-extraction is carried out on different pressure-extraction units of a coal seam, so that the gas extraction efficiency is improved, the use efficiency of high-pressure gas and the gas extraction concentration are improved, and the gas extraction effect is more uniform.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the unit circulating type pressure pumping integrated gas extraction system comprises: the device comprises a gas supercharging device, a high-pressure gas storage regulation and control device, a pressure pumping collecting pipe and a plurality of pressure pumping units distributed in a coal seam; each pressure and suction unit comprises: the device comprises a first pressure-pumping subunit and a second pressure-pumping subunit, wherein the drill holes of the first pressure-pumping subunit and the drill holes of the second pressure-pumping subunit are alternately arranged; each pressure pumping unit is correspondingly provided with two pressure pumping collecting pipes, one pressure pumping collecting pipe is connected with the drill holes of all the first pressure pumping sub-units of the pressure pumping unit corresponding to the pressure pumping collecting pipe, and the other pressure pumping collecting pipe is connected with the drill holes of all the second pressure pumping sub-units of the pressure pumping unit corresponding to the pressure pumping collecting pipe; the pressure pumping collecting pipe is respectively connected with the pumping main pipeline and the high-pressure gas storage regulation and control device; the high-pressure gas storage regulation and control device is connected with the gas supercharging device; and the gas supercharging device is connected with an underground compressed air pipeline.
As a further technical solution, the pumping manifold includes: the system comprises a collecting pipe main body, an extraction system connecting port, a pressure injection system connecting port and a plurality of extraction drill hole connecting ports; the main body of the collecting pipe is provided with an extraction system connecting port which is connected with a high-pressure ball valve and a multifunctional parameter instrument, and the multifunctional parameter instrument is connected with an extraction main pipeline through a high-pressure rubber pipe; the manifold body is provided with a pressure injection system connector which is connected with a high-pressure ball valve; and the plurality of extraction drill hole connecting ports are respectively and correspondingly connected to the drill hole of the first pressure pumping sub unit and the drill hole of the second pressure pumping sub unit.
As a further technical solution, the high pressure gas storage regulation and control device comprises: the high-pressure gas storage tank is connected with a gas supercharging device through a high-pressure rubber tube, an outlet of the high-pressure gas storage tank is connected with the pressure reducing valve, the pressure reducing valve is connected with a flowmeter, and the flowmeter is connected with a pressure injection system connecting port of a pressure pumping collecting pipe through the high-pressure rubber tube; and a pressure relief valve is arranged at a pressure relief opening of the high-pressure air storage tank.
In a second aspect, the invention provides a unit circulation type pressure-pumping integrated gas extraction method, and the unit circulation type pressure-pumping integrated gas extraction system comprises the following steps:
s1, dividing the coal seam into N pressure pumping units, wherein each pressure pumping unit comprises: the device comprises a first pressure-pumping subunit and a second pressure-pumping subunit, wherein the drill holes of the first pressure-pumping subunit and the drill holes of the second pressure-pumping subunit are alternately arranged;
s2, calculating the standard-reaching extraction quantity Q of each extraction unit according to the original gas content of the coal seam, the extracted standard-reaching gas content and the coal seam condition parametersN is up to standard；
S3, connecting the unit circulating type pressure pumping integrated gas extraction system, starting a gas supercharging device, and increasing the pressure of the high-pressure gas storage tank to 15 MPa;
s4, adjusting the pressure pumping collecting pipe, and performing pressure injection on the drill hole of the first pressure pumping sub-unit of the 1 st pressure pumping unit, wherein the pressure injection flow rate is qmax1.2, extracting the drill holes of the second pressure pumping sub units of all the pressure pumping units, stopping extracting and pressure injection when the extraction concentration α of the second pressure pumping sub unit of the 1 st pressure pumping unit is reduced to 20% of that before pressure pumping, and then executing the step S5;
s5, calculating the extraction standard reaching condition of the 2 nd pressure extraction unit, including:
if the extraction quantity Q of the 2 nd pressure extraction unit2＜Q2 reach standardAdjusting the pressure pumping collecting pipe, and injecting air into the drilled hole of the first pressure pumping subunit of the 2 nd pressure pumping unit at a pressure injection flow rate of qmax1.2 for all the pressure-extraction unitsWhen the extraction concentration α of the second pressure extraction subunit of the 2 nd pressure extraction unit is reduced to 20% of the extraction concentration before pressure extraction, stopping extraction and pressure injection, and then executing the step S6;
if the extraction quantity Q of the 2 nd pressure extraction unit2＞Q2 reach standardIf the extraction of the 2 nd pressure extraction unit reaches the standard, stopping extraction and pressure injection, and then executing the step S6;
s6, calculating the next extraction standard reaching situation of the pressure pumping unit in sequence, wherein the calculation comprises the following steps:
if the extraction amount of the pressure pumping unit does not reach the standard, the pressure pumping collecting pipe is adjusted, and air is injected into the drill hole of the first pressure pumping sub-unit of the pressure pumping unit, wherein the injection flow rate is qmaxAnd/1.2, extracting the drill holes of the second pressure extraction sub units of all the pressure extraction units, and stopping extraction and pressure injection when the extraction concentration α of the second pressure extraction sub units of the pressure extraction units is reduced to 20% of that before pressure extraction;
if the extraction amount of the pressure extraction unit reaches the standard, stopping extraction and pressure injection;
sequentially until the injection of the first pressure extraction subunit of the pressure extraction unit which does not reach the standard is finished, and then executing the step S7;
as a further technical scheme, calculating the extraction standard reaching condition of the 1 st pressure extraction unit comprises:
if Q1＜Q1 up to standardAdjusting the pressure pumping collecting pipe, and injecting air into the drilled hole of the second pressure pumping subunit of the 1 st pressure pumping unit with the injection flow rate of qmax1.2, extracting the drill holes of the first pressure pumping sub-units of all the pressure pumping units, stopping extracting and pressure injection when the extraction concentration of the first pressure pumping sub-unit of the 1 st pressure pumping unit is reduced to 20% of that before pressure pumping in the circulation, and then executing the step S8;
as a further technical scheme, the method for calculating the extraction standard reaching condition of the next pressure pumping unit in sequence comprises the following steps:
if the extraction amount of the pressure pumping unit does not reach the standard, the pressure pumping collecting pipe is adjusted, and air is injected into the drill hole of the second pressure pumping sub-unit of the pressure pumping unit, wherein the injection flow rate is qmax1.2, extracting the drill holes of the first pressure extraction sub units of all the pressure extraction units, and stopping extraction and pressure injection when the extraction concentration α of the first pressure extraction sub units of the pressure extraction units is reduced to 20% of that before pressure extraction;
if the extraction amount of the pressure extraction unit reaches the standard, stopping extraction and pressure injection;
sequentially until the injection of the second pressure extraction subunit of the pressure extraction unit which does not reach the standard is finished, and then executing the step S9;
s9, calculating the extraction standard reaching condition of the 1 st pressure extraction unit, including:
if Q1＜Q1 up to standardThen, step S4 is executed;
if Q1＞Q1 up to standardThen, step S5 is executed;
and S10, repeating the steps S4 to S9 until all the pressure extraction units reach the extraction standard.
As a further technical solution, in step S1, the coal seam is divided into N pressure-pumping units, and the number N of the pressure-pumping units satisfies the following calculation formula:
in the formula, M is the total number of extraction drill holes of one stope face, qmaxThe flow rate is the rated standard condition output flow rate of the supercharging device, q is the flow rate required by effective pressure pumping of the drill hole with unit length, L is the average length of a single pumping drill hole through laboratory measurement, and 1.2 is a redundancy coefficient.
As a further technical scheme, the standard-reaching extraction quantity Q of each pressure extraction unitN is up to standardThe following calculation formula is satisfied:
Qn is up to standard＝(w0-wReach the standard)(L-H1-H2+2R)(l-h1-h2+R)mγ
In the formula, w0The original gas content of the coal in the pressure pumping unit is obtained; w is aReach the standardPre-pumping the coal body in the pressure pumping unit to reach the standard gas content, L evaluating the coal seam strike length of the unit, and l evaluating the average tendency of the coal seam in the control range of the unitA length; h1、H2Pre-discharging equivalent width for the gas of the roadways at two ends of the trend direction of the evaluation unit, wherein if no roadway exists, the equivalent width is 0; h is1、h2Pre-discharging equivalent width for evaluating the gas of the roadways at the two ends of the unit inclination direction, and if no roadway exists, the equivalent width is zero; m is the average coal seam thickness of the evaluation unit; γ is the density of the evaluation unit coal.
By adopting the technical scheme, the invention has the following beneficial effects:
compared with the prior art, the method fully considers the actual situation that the cracks around the underground actual drilling hole are not uniformly developed and the pressure injection operation is difficult to control by adopting constant pressure, and adopts constant flow rate for pressure injection; the invention utilizes the hysteresis effect of the pressure injection air on the improvement of the gas extraction effect, adopts the concepts of intermittent pressure injection and partitioned pressure injection, divides the extraction working face into different pressure extraction units, and alternately performs pressure injection extraction and pure extraction on a single pressure extraction unit, and can still maintain the extraction promoting effect for a longer time after the pressure extraction of each pressure extraction unit is finished, and simultaneously give sufficient desorption time to the gas of the coal body, thereby ensuring the utilization efficiency of a limited high-pressure air source, improving the extraction concentration, and enabling the pressure extraction integrated technology to be popularized and applied in a large scale; according to the invention, the extraction nonuniformity caused by arrangement of constant pressure injection holes and extraction holes is also considered, each pressure extraction unit is divided into 2 subunits, and each subunit is alternately pressed and extracted in different pressure extraction cycles, so that the uniformity of the extraction effect is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a diagram of measured data of a hysteresis effect of extraction quantity increase after air injection.
Fig. 2 is a schematic view of a sub-unit circulating type air injection and air extraction integrated system.
Fig. 3 is a front view of the high pressure gas storage regulating device.
Fig. 4 is an elevation view of a pumping manifold.
FIG. 5 is a top view of the pumping manifold.
Fig. 6 is a schematic diagram of the periodic alternate injection of the pumping unit N.
FIG. 7 is a flow chart of the integrated process of unit circulation type air injection and air extraction.
In fig. 2: the system comprises a coal seam 1, a stop extraction line 2, a pressure extraction unit 3, a first pressure extraction subunit 4, a second pressure extraction subunit 5, a main extraction pipeline 6, an underground compressed air pipeline 7, a gas supercharging device 8, a high-pressure gas storage regulation and control device 9, a high-pressure rubber pipe 10 and a pressure extraction collecting pipe 11.
In fig. 3, 901 is an inlet of the high-pressure gas tank, 902 is an outlet of the high-pressure gas tank, 903 is a pressure reducing valve, 904 is a flow meter, and 905 is a relief valve.
In fig. 4, 1101 is a manifold main body, 1102 is an extraction system connection port, 1103 is a high-pressure ball valve, 1104 is a multi-function parameter instrument, and 1105 is an injection system connection port.
In fig. 5, reference numeral 1106 denotes an extraction borehole connection port.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood 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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
Example one
Referring to fig. 1 to 7, the present embodiment provides a unit circulation type pressure-pumping integrated gas extraction system, including: the system comprises a gas supercharging device 8, a high-pressure gas storage regulation and control device 9, a pressure pumping collecting pipe 11 and a plurality of pressure pumping units 3 distributed in a coal seam 1;
each pressure drawing unit 3 comprises: a first pressure-pumping subunit 4 and a second pressure-pumping subunit 5, wherein the drill holes of the first pressure-pumping subunit 4 and the drill holes of the second pressure-pumping subunit 5 are alternately arranged.
Each pressure pumping unit 3 is correspondingly provided with two pressure pumping collecting pipes 11, wherein one pressure pumping collecting pipe 11 is connected with the drill holes of all the first pressure pumping sub-units 4 of the pressure pumping unit 3 corresponding to the pressure pumping collecting pipe 11, and the other pressure pumping collecting pipe 11 is connected with the drill holes of all the second pressure pumping sub-units 5 of the pressure pumping unit 3 corresponding to the pressure pumping collecting pipe 11. The pressure pumping collecting pipe 11 is respectively connected with the pumping main pipeline 6 and the high-pressure gas storage regulation and control device 9; the high-pressure gas storage regulation and control device 9 is connected with the gas supercharging device 8; the gas supercharging device 8 is connected with the underground compressed air pipeline 7.
In this embodiment, as a further technical solution, the pressure pumping manifold 11 includes: the system comprises a collecting pipe main body 1101, an extraction system connecting port 1102, a pressure injection system connecting port 1105 and a plurality of extraction drill hole connecting ports 1106; the collecting pipe main body 1101 is provided with an extraction system connecting port 1102, the extraction system connecting port 1102 is connected with a high-pressure ball valve 1103 and a multifunctional parameter instrument 1104, and the multifunctional parameter instrument 1104 is connected with an extraction main pipeline 6 through a high-pressure rubber pipe; the manifold main body 1101 is provided with a pressure injection system connecting port 1105, and the pressure injection system connecting port 1105 is connected with a high-pressure ball valve 1103; the plurality of extraction drill hole connecting ports are respectively and correspondingly connected to the drill hole of the first pressure pumping sub unit 4 and the drill hole of the second pressure pumping sub unit 5.
As a further technical solution, the high-pressure gas storage regulation and control device 9 includes: the high-pressure gas storage tank is characterized by comprising a high-pressure gas storage tank, a pressure relief valve 905, a pressure reducing valve 903 and a flow meter 904, wherein an inlet 901 of the high-pressure gas storage tank is connected with a gas supercharging device 8 through a high-pressure rubber pipe, an outlet 902 of the high-pressure gas storage tank is connected with the pressure reducing valve 903, the pressure reducing valve 903 is connected with the flow meter 904, and the flow meter 904 is connected with a pressure injection system connecting port 1105 of a pressure pumping collecting pipe; a pressure relief valve 905 is arranged at a pressure relief opening of the high-pressure air storage tank.
Therefore, the actual situation that the cracks around the actual underground drill hole are not uniformly developed and the pressure injection operation is difficult to control by adopting the constant pressure is fully considered, and the pressure injection is carried out by adopting the constant flow; the invention utilizes the hysteresis effect of the pressure injection air on the improvement of the gas extraction effect, adopts the concepts of intermittent pressure injection and zonal pressure injection, divides the extraction working face into different pressure extraction units 3, and alternately performs pressure injection extraction and pure extraction on the single pressure extraction unit 3, and can still maintain the extraction promoting effect for a long time after the pressure extraction of each pressure extraction unit 3 is finished, and simultaneously provides sufficient desorption time for the gas of the coal body, thereby ensuring the utilization efficiency of the limited high-pressure air source, improving the extraction concentration, and enabling the pressure extraction integrated technology to be popularized and applied in a large scale; according to the invention, the extraction nonuniformity caused by arrangement of constant pressure injection holes and extraction holes is also considered, each pressure extraction unit 3 is divided into 2 subunits, and each subunit is alternately pressed and extracted in different pressure extraction cycles, so that the uniformity of the extraction effect is ensured.
Example two
The embodiment further provides a unit circulation type pressure pumping integrated gas extraction method on the basis of the first embodiment, and the method comprises the following steps:
and S1, dividing the coal bed into N pressure pumping units 3. The number of cells N is calculated by the following formula:
in the formula, M is the total number of extraction drill holes of one stope face, qmaxThe flow rate is the rated standard condition output flow rate of the supercharging device, q is the flow rate required by effective pressure pumping of a drill hole with unit length (1m), L is the average length of a single pumping drill hole through laboratory measurement, and 1.2 is a redundancy coefficient.
S2, calculating the standard-reaching extraction quantity Q of each extraction unit according to the original gas content of the coal seam, the extracted standard-reaching gas content and the coal seam condition parametersN is up to standard. The extraction quantity Q reaching the standard of each pressure extraction unit 3N is up to standardBy calculating as follows:
Qn is up to standard＝(w0-wReach the standard)(L-H1-H2+2R)(l-h1-h2+R)mγ
Wherein, w0The original gas content of the coal in the pressure pumping unit 3 is shown; w is aReach the standardPre-extracting the coal body in the pressure extraction unit 3 to reach the standard gas content, L is the strike length of the coal bed of the evaluation unit, l is the average tendency length of the coal bed in the control range of the evaluation unit, H is the average tendency length of the coal bed in the control range of the evaluation unit1、H2Pre-discharging equivalent width for the gas of the roadways at two ends of the trend direction of the evaluation unit, wherein if no roadway exists, the equivalent width is 0; h is1、h2Pre-discharging equivalent width for the gas of the roadways at the two ends of the evaluation unit inclination direction, if no roadway exists, the equivalent width is zero, and m is the average coal seam thickness of the evaluation unit; γ is the density of the evaluation unit coal.
S3, as shown in fig. 2, connecting the downhole compressed air pipeline 7 with the gas supercharging device 8, connecting the gas supercharging device 8 with the high-pressure gas storage regulation and control device 9 through the high-pressure rubber pipe 10, connecting the high-pressure gas storage regulation and control device 9 with the pressure pumping manifold 11, connecting the pressure pumping manifold 11 with the corresponding drill hole of the first pressure pumping sub-unit 4 or the second pressure pumping sub-unit 5, and connecting the pressure pumping manifold 11 with the main extraction pipeline 6. As shown in fig. 3, the pressure reducing valve 903 on the high-pressure gas storage regulating device 9 is closed, the gas pressurizing device 8 is opened, and the pressure of the high-pressure gas storage tank is increased to 15 MPa.
S4, as shown in fig. 4 and 5, closing the connection port 1102 of the extraction system connected to the first pressure-pumping subunit 4 (subunit ①) of the 1 st pressure-pumping unit 3 (pressure-pumping unit 3 one), opening the connection port 1105 of the pressure injection system, adjusting the high-pressure gas pressure reducing valve 903 on the high-pressure gas storage regulation and control device 9, observing the reading of the flowmeter 904, and adjusting the gas injection flow rate to QmaxAnd 1.2, performing air pressure injection on the drill hole of the first pressure pumping subunit 4 of the 1 st pressure pumping unit 3. And opening the extraction system connecting port 1102 of the pressure extraction collecting pipe 11 connected with other pressure extraction sub-units, closing the pressure injection system, and extracting other pressure extraction sub-units. Accumulated extraction quantity Q through multifunctional parameter instrument 1104 on pressure extraction collecting pipe 11NAnd real-time extraction concentration α.
The pressure reducing valve 903 on the high-pressure gas storage regulating device 9 is adjusted to maintain the pressure injection flow at QmaxAnd 1.2, observing the reading of the multifunctional parameter instrument 1104, and stopping the 1 st circulation pressure injection of the 1 st pressure extraction unit 3 when the mixed extraction concentration α of the second pressure extraction sub-unit 5 (sub-unit ②) of the 1 st pressure extraction unit 3 is reduced to 20% of the concentration before pressure extraction.
S5, arranging the extraction stopping lines 2 in sequence, calculating the extraction standard reaching condition of the 2 nd pressure extraction unit 3 (the second pressure extraction unit 3), and if Q is reached2＜Q2 reach standardThe connected pressure suction manifold 11 is adjusted to perform pressure injection on the drill hole of the first pressure suction subunit 4 of the pressure suction unit 3, and the pressure injection flow rate is qmaxAnd 1.2, extracting the drill holes of all other pressure extraction sub-units, wherein the extraction effect is monitored by a multifunctional parameter instrument 1104 on the pressure extraction collecting pipe 11.
If Q2＞Q2 reach standardIf the extraction reaches the standard, the pressure extraction unit 3 stops extraction and pressure injection, calculates the extraction reaching the standard of the next pressure extraction unit 3 in sequence, and carries out extraction treatment on the second unit which does not extract the unit reaching the standardA pressing and pumping sub-unit 4 is drilled for pressing and injecting.
And S6, repeating the steps 4 and 5, and completing the pressure injection of the first pressure pumping sub-units 4 of all the pressure pumping units 3 which do not extract the gas to reach the standard.
S7, calculating the extraction standard reaching condition of the 1 st pressure extraction unit 3, and if Q is up to standard1＜Q1 up to standardAdjusting the pressure pumping collecting pipe 11, and injecting air into the drilled hole of the second pressure pumping sub-unit 5 of the 1 st pressure pumping unit 3, wherein the injection flow rate is QmaxAnd 1.2, extracting the drill holes of all the other unqualified pressure extraction units 3. When the extraction concentration of the first pressure extraction sub-unit 4 of the first pressure extraction unit 3 is reduced to 20% of that before the pressure extraction in the cycle, the 2 nd cycle pressure injection of the 1 st pressure extraction unit 3 is stopped, and the cycle alternate pressure injection process of each pressure extraction unit 3 is shown in fig. 6.
And S8, calculating the extraction standard-reaching condition of the next pressure extraction unit 3 in sequence, and performing pressure injection on the second pressure extraction sub-unit 5 of the unit which does not extract the standard-reaching condition.
And S9, repeating the steps 7 and 8, and completing the pressure injection of the second pressure pumping sub-units 5 of all the pressure pumping units 3 which do not extract the water to reach the standard.
And S10, repeating the steps 4-9 until all the pressure extraction units 3 reach the extraction standard, wherein the whole pressure injection integrated process is shown in FIG. 7.
In conclusion, the method fully considers the actual situation that the cracks around the actual underground drill hole are not uniformly developed and the pressure injection operation is difficult to control by adopting the constant pressure, and adopts the constant flow rate for pressure injection; according to the invention, the hysteresis effect of the pressure injection air on the improvement of the gas extraction effect (as shown in figure 1) is utilized, the intermittent pressure injection and partition pressure injection concepts are adopted, the extraction working face is divided into different pressure extraction units 3, the single pressure extraction unit 3 is subjected to alternate pressure injection extraction and pure extraction, the extraction promoting effect can be maintained for a long time after the pressure extraction of each pressure extraction unit 3 is finished, meanwhile, the sufficient desorption time is provided for the gas of the coal body, the utilization efficiency of a limited high-pressure air source is ensured, the extraction concentration is improved, and the pressure extraction integrated technology can be popularized and applied in a large scale; according to the invention, the extraction nonuniformity caused by arrangement of constant pressure injection holes and extraction holes is also considered, each pressure extraction unit 3 is divided into 2 subunits, and each subunit is alternately pressed and extracted in different pressure extraction cycles, so that the uniformity of the extraction effect is ensured.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. Unit circulating type pressure pumping integrated gas extraction system is characterized by comprising: the device comprises a gas supercharging device, a high-pressure gas storage regulation and control device, a pressure pumping collecting pipe and a plurality of pressure pumping units distributed in a coal seam;
each pressure and suction unit comprises: the device comprises a first pressure-pumping subunit and a second pressure-pumping subunit, wherein the drill holes of the first pressure-pumping subunit and the drill holes of the second pressure-pumping subunit are alternately arranged; each pressure pumping unit is correspondingly provided with two pressure pumping collecting pipes, one pressure pumping collecting pipe is connected with the drill holes of all the first pressure pumping sub-units of the pressure pumping unit corresponding to the pressure pumping collecting pipe, and the other pressure pumping collecting pipe is connected with the drill holes of all the second pressure pumping sub-units of the pressure pumping unit corresponding to the pressure pumping collecting pipe; the pressure pumping collecting pipe is respectively connected with the pumping main pipeline and the high-pressure gas storage regulation and control device; the high-pressure gas storage regulation and control device is connected with the gas supercharging device; and the gas supercharging device is connected with an underground compressed air pipeline.
2. The unit circulation type pressure-pumping integrated gas extraction system according to claim 1, wherein the pressure-pumping manifold comprises: the system comprises a collecting pipe main body, an extraction system connecting port, a pressure injection system connecting port and a plurality of extraction drill hole connecting ports; the main body of the collecting pipe is provided with an extraction system connecting port which is connected with a high-pressure ball valve and a multifunctional parameter instrument, and the multifunctional parameter instrument is connected with an extraction main pipeline through a high-pressure rubber pipe; the manifold body is provided with a pressure injection system connector which is connected with a high-pressure ball valve; and the plurality of extraction drill hole connecting ports are respectively and correspondingly connected to the drill hole of the first pressure pumping sub unit and the drill hole of the second pressure pumping sub unit.
3. The unit circulation type pressure pumping integrated gas extraction system according to claim 1, wherein the high-pressure gas storage regulation and control device comprises: the high-pressure gas storage tank is connected with a gas supercharging device through a high-pressure rubber tube, an outlet of the high-pressure gas storage tank is connected with the pressure reducing valve, the pressure reducing valve is connected with a flowmeter, and the flowmeter is connected with a pressure injection system connecting port of a pressure pumping collecting pipe through the high-pressure rubber tube; and a pressure relief valve is arranged at a pressure relief opening of the high-pressure air storage tank.
4. A unit circulation type pressure-pumping integrated gas extraction method is characterized in that the unit circulation type pressure-pumping integrated gas extraction system as claimed in any one of claims 1 to 3 is adopted, and the method comprises the following steps:
s1, dividing the coal seam into N pressure pumping units, wherein each pressure pumping unit comprises: the device comprises a first pressure-pumping subunit and a second pressure-pumping subunit, wherein the drill holes of the first pressure-pumping subunit and the drill holes of the second pressure-pumping subunit are alternately arranged;
s2, calculating the standard-reaching extraction quantity Q of each extraction unit according to the original gas content of the coal seam, the extracted standard-reaching gas content and the coal seam condition parametersN is up to standard；
S3, connecting the unit circulating type pressure pumping integrated gas extraction system, starting a gas supercharging device, and increasing the pressure of the high-pressure gas storage tank to 15 MPa;
s4, adjusting the pressure pumping collecting pipe, and performing pressure injection on the drill hole of the first pressure pumping sub-unit of the 1 st pressure pumping unit, wherein the pressure injection flow rate is qmaxAnd 1.2, extracting the drill holes of the second pressure pumping sub units of all the pressure pumping units, and stopping extracting when the extraction concentration α of the second pressure pumping sub unit of the 1 st pressure pumping unit is reduced to 20% of that before pressure pumpingAnd the injection, then step S5 is executed;
s5, calculating the extraction standard reaching condition of the 2 nd pressure extraction unit, including:
if the extraction quantity Q of the 2 nd pressure extraction unit2＜Q2 reach standardAdjusting the pressure pumping collecting pipe, and injecting air into the drilled hole of the first pressure pumping subunit of the 2 nd pressure pumping unit at a pressure injection flow rate of qmaxWhen the extraction concentration α of the second pressure extraction sub unit of the 2 nd pressure extraction unit is reduced to 20% of the concentration before pressure extraction, stopping extraction and pressure injection, and then executing the step S6;
if the extraction quantity Q of the 2 nd pressure extraction unit2＞Q2 reach standardIf the extraction of the 2 nd pressure extraction unit reaches the standard, stopping extraction and pressure injection, and then executing the step S6;
s6, calculating the next extraction standard reaching situation of the pressure pumping unit in sequence, wherein the calculation comprises the following steps:
if the extraction amount of the pressure pumping unit does not reach the standard, the pressure pumping collecting pipe is adjusted, and air is injected into the drill hole of the first pressure pumping sub-unit of the pressure pumping unit, wherein the injection flow rate is qmaxAnd/1.2, extracting the drill holes of the second pressure extraction sub units of all the pressure extraction units, and stopping extraction and pressure injection when the extraction concentration α of the second pressure extraction sub units of the pressure extraction units is reduced to 20% of that before pressure extraction;
if the extraction amount of the pressure extraction unit reaches the standard, stopping extraction and pressure injection;
sequentially until the injection of the first pressure extraction subunit of the pressure extraction unit which does not reach the standard is finished, and then executing the step S7;
s7, calculating the extraction standard reaching condition of the 1 st pressure extraction unit, including:
if Q1＜Q1 up to standardAdjusting the pressure pumping collecting pipe, and injecting air into the drilled hole of the second pressure pumping subunit of the 1 st pressure pumping unit with the injection flow rate of qmaxAnd 1.2, extracting the drill holes of the first pressure pumping sub units of all the pressure pumping units, stopping extraction and pressure injection when the extraction concentration of the first pressure pumping sub unit of the 1 st pressure pumping unit is reduced to 20 percent of that of the first pressure pumping unit in the circulation before pressure pumping, and then executing the stepA step S8;
s8, calculating the next extraction standard reaching situation of the pressure pumping unit in sequence, wherein the calculation comprises the following steps:
if the extraction amount of the pressure pumping unit does not reach the standard, the pressure pumping collecting pipe is adjusted, and air is injected into the drill hole of the second pressure pumping sub-unit of the pressure pumping unit, wherein the injection flow rate is qmax1.2, extracting the drill holes of the first pressure extraction sub units of all the pressure extraction units, and stopping extraction and pressure injection when the extraction concentration α of the first pressure extraction sub units of the pressure extraction units is reduced to 20% of that before pressure extraction;
if the extraction amount of the pressure extraction unit reaches the standard, stopping extraction and pressure injection;
sequentially until the injection of the second pressure extraction subunit of the pressure extraction unit which does not reach the standard is finished, and then executing the step S9;
s9, calculating the extraction standard reaching condition of the 1 st pressure extraction unit, including:
if Q1＜Q1 up to standardThen, step S4 is executed;
if Q1＞Q1 up to standardThen, step S5 is executed;
and S10, repeating the steps S4 to S9 until all the pressure extraction units reach the extraction standard.
5. The unit circulation type pressure extraction and extraction integrated gas extraction method according to claim 4, wherein in the step S1, the coal seam is divided into N pressure extraction units, and the number N of the pressure extraction units satisfies the following calculation formula:
in the formula, M is the total number of extraction drill holes of one stope face, qmaxThe flow rate is the rated standard condition output flow rate of the supercharging device, q is the flow rate required by effective pressure pumping of the drill hole with unit length, L is the average length of a single pumping drill hole through laboratory measurement, and 1.2 is a redundancy coefficient.
6. The unit circulation type pressure extraction and extraction integrated gas extraction method according to claim 4,
extraction quantity Q reaching the standard of each pressure extraction unitN is up to standardThe following calculation formula is satisfied:
Qn is up to standard＝(w0-wReach the standard)(L-H1-H2+2R)(l-h1-h2+R)mγ
In the formula, w0The original gas content of the coal in the pressure pumping unit is obtained; w is aReach the standardPre-pumping the coal body in the pressure pumping unit to reach the standard gas content, L evaluating the coal seam strike length of the unit, l the average inclined length of the coal seam in the control range of the unit, H1、H2Pre-discharging equivalent width for the gas of the roadways at two ends of the trend direction of the evaluation unit, wherein if no roadway exists, the equivalent width is 0; h is1、h2Pre-discharging equivalent width for the gas of the roadways at the two ends of the evaluation unit inclination direction, if no roadway exists, the equivalent width is zero, and m is the average coal seam thickness of the evaluation unit; γ is the density of the evaluation unit coal.
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