CN117929660A - Method, device and equipment for testing hydraulic retention time of underground coal mine reservoir - Google Patents
Method, device and equipment for testing hydraulic retention time of underground coal mine reservoir Download PDFInfo
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Abstract
The embodiment of the disclosure provides a method, a device and equipment for testing hydraulic retention time of an underground coal mine reservoir. The method comprises the following steps: acquiring water environment characteristics and rock physicochemical properties of an underground coal mine reservoir; according to the characteristics of water environment and physical and chemical properties of rock, selecting a tracer and determining the initial concentration of the tracer; after tracer is put into a water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at a water outlet pipe of the coal mine underground reservoir is obtained; from the measured concentration of the tracer, the hydraulic retention time is predicted. In this way, after the tracer is thrown into the water inlet pipe of the underground coal mine reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the underground coal mine reservoir can be intermittently collected, and then the hydraulic retention time of the underground coal mine reservoir can be automatically and accurately predicted according to the measured concentration of the tracer, so that scientific and reliable data can be provided for scientific research of the underground coal mine reservoir.
Description
Technical Field
The disclosure relates to the field of underground reservoirs in coal mines, in particular to the technical field of hydraulic retention time testing.
Background
The technology of the coal mine underground reservoir opens up a new way for coordination of coal exploitation and water resource protection and utilization, in the process of researching the purification mechanism of the underground reservoir on mine water, scientific research conditions, such as the hydraulic retention time of the coal mine underground reservoir, are required to be obtained, however, at present, a scientific and operable test method for the hydraulic retention time of the coal mine underground reservoir is not available, so that the scientificity and reliability of research are affected.
Disclosure of Invention
The disclosure provides a method, a device, equipment and a storage medium for testing hydraulic retention time of an underground coal mine reservoir.
According to a first aspect of the disclosure, a method for testing hydraulic retention time of an underground coal mine reservoir is provided. The method comprises the following steps:
Acquiring water environment characteristics and rock physicochemical properties of the coal mine underground reservoir;
selecting a tracer according to the water environment characteristics and the physicochemical properties of the rock, and determining the initial concentration of the tracer;
After the tracer is thrown into the water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir is obtained;
The hydraulic retention time is predicted from the measured concentration of the tracer.
Aspects and any one of the possible implementations as described above, further providing an implementation, the method further including:
acquiring investigation data of the coal mine underground reservoir;
determining the size and gradient of the underground coal mine reservoir according to the exploration data;
and determining the position of the water inlet pipe and the position of the water outlet pipe according to the size of the coal mine underground reservoir and the gradient.
In aspects and any one of the possible implementations described above, there is further provided an implementation of predicting the hydraulic retention time based on the measured concentration of the tracer, comprising:
judging whether the measured concentration of the tracer is less than or equal to the product of the initial concentration and a preset coefficient, wherein the preset coefficient is more than 0 and less than or equal to 30%;
And predicting the hydraulic retention time according to the judging result.
In accordance with aspects and any one of the possible implementations described above, there is further provided an implementation, predicting the hydraulic retention time according to a determination result, including:
if the measured concentration of the tracer is smaller than or equal to the measured concentration, judging that the measured concentration of the tracer is effective, otherwise, judging that the measured concentration of the tracer is ineffective;
And predicting the hydraulic retention time according to the measurement time corresponding to the effective measured concentration of the tracer.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the obtaining the measured concentration of the tracer at the outlet pipe of the coal mine underground reservoir includes:
Measuring the measured concentration of the tracer at the water outlet pipe according to a first preset period;
And when the measured concentration of the tracer at the water outlet pipe is not equal to zero, acquiring the measured concentration of the tracer at the water outlet pipe according to a second preset period, and stopping measuring when the difference value between the measured concentration and the background concentration of the tracer at the water outlet pipe is smaller than a preset threshold value after the measured concentration reaches a maximum peak value, wherein the background concentration is the concentration of the tracer at the water outlet pipe when the tracer is not put into the underground coal mine reservoir, and the first preset period is larger than the second preset period.
In accordance with aspects and any possible implementation manner of the foregoing, there is further provided an implementation manner, determining a start measurement time according to the first preset period according to a length of the coal mine underground reservoir and a flow rate of the water inlet.
In the aspect and any possible implementation manner as described above, there is further provided an implementation manner, where the obtaining the measured concentration of the tracer at the outlet pipe of the coal mine underground reservoir includes:
And measuring the measured concentration of the tracer at the water outlet pipe according to an ion electrode method, wherein the tracer comprises potassium iodide.
Aspects and any one of the possible implementations as described above, further providing an implementation, the aqueous environmental characteristic including at least one of: the water chemistry type, the oxidation environment, the PH and the temperature of the coal mine underground reservoir;
the rock physicochemical properties include at least one of: mineral type, element content, specific surface area, and porosity.
According to a second aspect of the present disclosure, a device for testing hydraulic retention time of an underground coal mine reservoir is provided. The device comprises:
The first acquisition module is used for acquiring the water environment characteristics and the rock physicochemical properties of the coal mine underground reservoir;
the processing module is used for selecting a tracer according to the water environment characteristics and the physicochemical properties of the rock and determining the initial concentration of the tracer;
the second acquisition module is used for acquiring the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir after the tracer is thrown into the water inlet pipe of the coal mine underground reservoir according to the initial concentration;
And the prediction module is used for predicting the hydraulic retention time according to the measured concentration of the tracer.
According to a third aspect of the present disclosure, an electronic device is provided. The electronic device includes: a memory and a processor, the memory having stored thereon a computer program, the processor implementing the method as described above when executing the program.
According to a fourth aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which when executed by a processor implements a method according to the first and/or second aspects of the present disclosure.
In the method, according to the characteristics of water environment and the physicochemical properties of the rock, a proper tracer can be selected and the initial concentration of the tracer can be determined, so that after the tracer is put into the water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir can be intermittently collected.
It should be understood that what is described in this summary is not intended to limit the critical or essential features of the embodiments of the disclosure nor to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. For a better understanding of the present disclosure, and without limiting the disclosure thereto, the same or similar reference numerals denote the same or similar elements, wherein:
FIG. 1 illustrates a flow chart of a method of testing hydraulic retention time of an underground coal mine reservoir in accordance with an embodiment of the present disclosure;
FIG. 2 illustrates a flow chart of another method of testing hydraulic retention time of an underground coal mine reservoir in accordance with an embodiment of the present disclosure;
FIG. 3 shows a schematic plan view of a coal mine underground reservoir tracer experiment in accordance with an embodiment of the disclosure;
FIG. 4 shows a schematic side view of a coal mine underground reservoir tracking experiment, in accordance with an embodiment of the present disclosure;
FIG. 5 illustrates a block diagram of a test apparatus for hydraulic retention time of a coal mine underground reservoir, in accordance with an embodiment of the present disclosure;
Fig. 6 illustrates a block diagram of an exemplary electronic device capable of implementing embodiments of the present disclosure.
The correspondence between the numbers and the characters in fig. 3 and 4 is as follows:
1 coal mine underground reservoir, 2 overlying strata, 3 bottom plate strata, 4 water inlet pipes and 5 water outlet pipes.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are some embodiments of the present disclosure, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments in this disclosure without inventive faculty, are intended to be within the scope of this disclosure.
In addition, the term "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
FIG. 1 illustrates a flow chart of a method 100 of testing hydraulic retention time of a coal mine underground reservoir in accordance with an embodiment of the present disclosure. The method 100 may include:
step 110, acquiring water environment characteristics and rock physicochemical properties of the coal mine underground reservoir;
the water environment characteristics include at least one of: the water chemistry type, the oxidation environment, the PH and the temperature of the coal mine underground reservoir;
the rock physicochemical properties include at least one of: mineral type, element content, specific surface area, and porosity.
The types of tracers include, but are not limited to: pigments and fluorescein-like substances, plankton-like substances, radioisotopes and ionic compounds, while pigments and fluorescein-like substances, plankton-like substances are not easily measured, and radioactive isotopes easily cause radioactive influence on mine water, so the tracer type of the present disclosure is preferably an ionic compound.
Because the water environment characteristics are used for representing which ionic compounds possibly react with the coal mine underground reservoir, and the measured concentration of the tracer is influenced if the chemical reaction occurs, the ionic compounds which do not react with the coal mine underground reservoir can be selected from the tracer such as the ionic compounds as the tracer according to the water environment characteristics; likewise, the physical and chemical properties of the rock that collapses the rock within the underground coal mine reservoir may characterize the rock, with which tracers water may undergo water-rock coupling and the majority of the mesopores of the rock surface are used to characterize how large particles of the tracers can be adsorbed by the rock of the underground coal mine reservoir, so that the tracers that do not chemically react with and are not strongly adsorbed by the underground coal mine reservoir may be selected from the tracers of ionic compounds based on the characteristics of the water environment and the physical and chemical properties of the rock, and the appropriate initial concentration of the tracers may be determined.
Of course, in order to ensure that the initial concentration of the tracer is suitable, a simulation test can be performed using a laboratory based on a coal mine underground reservoir, and then calculated from the simulation test data.
Step 120, selecting a tracer and determining an initial concentration of the tracer according to the water environment characteristics and the rock physicochemical properties;
step 130, after the tracer is thrown into the water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir is obtained;
in practice, the plurality of water inlet pipes for water flowing into the coal mine underground reservoir and circulating the water, and the plurality of water outlet pipes for water flowing into the coal mine underground reservoir and flowing out of the water outlet pipes are also provided;
The water inlet pipe for adding the tracer can be one of the existing water inlet pipes or a newly-built water outlet pipe special for adding the tracer,
The water outlet pipe for measuring the concentration of the tracer can be one of the existing water outlet pipes, or can be a newly built water outlet pipe special for measuring the tracer, of course, the water inlet pipe for throwing the tracer can be used for feeding mine water, the water outlet pipe for measuring the concentration of the tracer can be used for feeding mine water, and the mine water can be used for discharging the mine water.
Step 140, predicting the hydraulic retention time based on the measured concentration of the tracer.
According to the characteristics of water environment and the physicochemical properties of the rock, a proper tracer can be selected and the initial concentration of the tracer can be determined, so that after the tracer is put into the water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir can be intermittently collected, and the sewage discharged from the coal mine can be purified due to the fact that the coal mine underground reservoir is a natural sewage purifier, so that the tracer can be purified, the measured concentration of the tracer in the purifying process can be changed, and the hydraulic retention time of the coal mine underground reservoir can be automatically and accurately predicted according to the measured concentration of the tracer, so that scientific and reliable data can be provided for scientific research of the coal mine underground reservoir.
In some embodiments, the method further comprises:
acquiring investigation data of the coal mine underground reservoir; survey data includes, but is not limited to: engineering plane data (plane data are used for determining reservoir size) of the underground reservoir of the coal mine and contour lines of the coal face.
Determining the size and gradient of the underground coal mine reservoir according to the exploration data;
and determining the position of the water inlet pipe and the position of the water outlet pipe according to the size of the coal mine underground reservoir and the gradient.
According to the actual size of the coal mine underground reservoir and the gradient, the position of the water inlet pipe and the position of the water outlet pipe can be automatically determined, specifically, according to the gradient, the flow direction of mine water in the coal mine underground reservoir can be determined, and then the position of the water inlet pipe is selected in the middle range (the middle point in the width direction and the position of the distance from the middle point in the preset distance range) in the width direction of the upstream of the coal mine underground reservoir, so that the tracer can flow uniformly in the coal mine underground reservoir. And the water inlet pipe is closer to the upper rock on the height of the coal mine underground reservoir.
Likewise, the position of the water outlet pipe can be selected in the intermediate range in the width direction downstream of the coal mine underground reservoir (the intermediate point in the downstream width direction and the position of the distance from the intermediate point within the preset distance range) and in the area closer to the lower rock at the height of the coal mine underground reservoir, so as to ensure that the concentration of the tracer can be effectively measured, and avoid the measurement failure.
In some embodiments, the predicting the hydraulic retention time based on the measured concentration of the tracer comprises:
judging whether the measured concentration of the tracer is less than or equal to the product of the initial concentration and a preset coefficient, wherein the preset coefficient is more than 0 and less than or equal to 30%;
And predicting the hydraulic retention time according to the judging result.
Since the tracer can flow to the water outlet pipe after a period of time, the tracer flowing more and less, the measured concentration of the tracer can gradually rise from zero and then fall, and the laboratory simulation test data show that after the tracer enters the underground coal mine reservoir, the underground coal mine water in the underground coal mine reservoir can be diluted to a very low concentration, and the concentration of the tracer at the water outlet is not more than 30% of the initial concentration, so that whether the measured concentration of the tracer is less than or equal to the product of the initial concentration and the preset coefficient can be judged, and then the hydraulic retention time can be automatically and accurately predicted according to the judgment result.
In some embodiments, predicting the hydraulic dwell time based on the determination comprises:
if the measured concentration of the tracer is smaller than or equal to the measured concentration, judging that the measured concentration of the tracer is effective, otherwise, judging that the measured concentration of the tracer is ineffective;
And predicting the hydraulic retention time according to the measurement time corresponding to the effective measured concentration of the tracer.
According to laboratory simulation test data, after the tracer enters the underground coal mine reservoir, mine water in the underground coal mine reservoir can dilute the tracer to a very low concentration, and the concentration of the tracer at the water outlet is not more than 30% of the initial concentration, so that if the measured concentration of the tracer is smaller than or equal to the product of the initial concentration and a preset coefficient, the measured concentration of the tracer is effective, otherwise, the tracer is ineffective, each tracer concentration has a measuring time, and the measuring time corresponding to the effective tracer measured concentration is also effective, so that the hydraulic retention time can be automatically and accurately predicted according to the measuring time corresponding to the effective tracer measured concentration.
Of course, since there may be a plurality of effective tracer concentrations and one measurement time for each concentration, there may be a plurality of effective measurement times, and thus the hydraulic dwell time is a range of values equal to the minimum and maximum values of the plurality of effective measurement times.
In some embodiments, the obtaining the measured concentration of the tracer at the outlet pipe of the coal mine underground reservoir comprises:
Measuring the measured concentration of the tracer at the water outlet pipe according to a first preset period;
And when the measured concentration of the tracer at the water outlet pipe is not equal to zero, acquiring the measured concentration of the tracer at the water outlet pipe according to a second preset period, and stopping measuring until the difference value between the measured concentration and the background concentration of the tracer at the water outlet pipe is smaller than a preset threshold value after the measured concentration reaches a maximum peak value, wherein the background concentration is the concentration of the tracer at the water outlet pipe when the tracer is not put into the underground coal mine reservoir, and the first preset period is larger than the second preset period, for example, the first preset period is 15 days, and the second preset period can be 1 day. And after the measured concentration of the tracer at the water outlet pipe reaches the maximum peak value, the difference value between the measured concentration and the background concentration is smaller than a preset threshold value again, which indicates that the tracer flowing into the underground reservoir of the mine basically flows out of the water outlet pipe.
When the concentration of the tracer is measured, the measured concentration of the tracer at the water outlet pipe can be measured according to a larger first preset period, then when the measured concentration is not equal to zero, the tracer can be measured, therefore, the measured concentration of the tracer at the water outlet pipe can be obtained according to a smaller second preset period, until the difference value between the measured concentration and the background concentration of the tracer at the water outlet pipe is smaller than a preset threshold value after the measured concentration reaches the maximum peak value, the measured concentration of the water outlet pipe returns to the background concentration again, the tracer entering the underground coal mine reservoir basically completely flows out, and therefore, the measurement is not required to be continued, and the measurement can be stopped, so that the complete and comprehensive tracer measured concentration is obtained, and unnecessary measurement is avoided.
In some embodiments, the initial measurement time according to the first preset period is determined according to the length of the coal mine underground reservoir and the flow rate of the water inlet.
Because the mine water flowing out of the coal mine can be subjected to the resistance of internal rocks after entering the underground coal mine reservoir, the flow rate of the mine water can be gradually reduced, so that the hydraulic retention time is not lower than the ratio of the length of the underground coal mine reservoir to the flow rate of the water inlet of the mine water, and specifically, the initial measurement time is larger than or equal to the ratio of the length of the underground coal mine reservoir to the flow rate of the water inlet of the mine water, thereby avoiding the premature measurement of the concentration of the tracer.
In some embodiments, the obtaining the measured concentration of the tracer at the outlet pipe of the coal mine underground reservoir comprises:
And measuring the measured concentration of the tracer at the water outlet pipe according to an ion electrode method, wherein the tracer comprises potassium iodide.
The detection method of the concentration of potassium iodide adopts an ion electrode method, and specifically comprises the following steps: ion concentration was measured using a digital ion meter as the ion selective electrode for potassium iodide anions. The principle is that when the iodine ion selective electrode and the reference electrode are connected with the ion meter, after the iodine ion selective electrode and the reference electrode are immersed into the measured solution, a passage is formed between the two electrodes, a certain potential difference is generated between the sensitive film of the ion electrode and the solution, and the relationship between the potential difference and the ion activity a in the solution accords with Nernst equation in the electrochemical theory:
Wherein: e is the potential value generated by the electrode system; e 0 is the value of the intercept potential of the electrode system, which can be regarded as a constant under certain conditions; r is a gas constant (size 8.314J/o.mol); f is Faraday constant (size 9.65X104C/mol); z is the valence of the trace ion; t is the absolute temperature of the solution (273+t ℃); a is the trace ion activity. It has a relation of a=f·c to the concentration C of the trace ion, f being the activity coefficient. Measuring an intercept potential value E0 (known) by an instrument; at the time of sampling measurement, the potassium iodide ion concentration C n (essentially, iodide ion concentration) can be obtained from the measured potential value E (output of the ion meter) according to the formula (1).
In some embodiments, the aqueous environmental characteristic comprises at least one of: the water chemistry type, the oxidation environment, the PH and the temperature of the coal mine underground reservoir;
the rock physicochemical properties include at least one of: mineral type, element content, specific surface area, and porosity.
The technical solution of the present disclosure will be described in further detail below with reference to fig. 2 to 4:
The method for testing the hydraulic retention time of the underground coal mine reservoir specifically comprises the following steps:
First, the underground reservoir of the coal mine (1) in fig. 3 and 4 is surveyed in detail, including hydrogeological data, mining engineering plane data, elevation line of coal face and water accumulation range data, goaf rock mass properties, in-reservoir rock collapse forms, etc. According to the detailed investigation data and data, the length L, the width W, the height H, the gradient i and the flow direction of mine water in the underground reservoir of the coal mine can be determined.
Further, according to the gradient i of the underground coal mine reservoir and/or the flowing direction of mine water in the reservoir (1), the water inlet pipe (4), namely the tracer throwing position, is arranged at the upstream position of the flowing direction of the mine water, and the water outlet pipe (5), namely the tracer receiving position, is arranged at the downstream position of the flowing direction of the mine water, and the position schematic is shown in the figures 3 and 4.
Further, the water inlet and outlet conditions of the underground reservoir of the coal mine are detected and analyzed, the water inlet and outlet conditions comprise flow rate, water head pressure, water level in the reservoir and water quality indexes, the background concentration of the tracer agent (namely the concentration of the tracer agent at the water outlet pipe when the tracer agent is not put into the water inlet) can be determined by mastering the water inlet and outlet quality (cations and anions), the hydraulic retention time can be predicted according to the size of the underground reservoir and the water inlet and outlet conditions, and because the flow rate of the mine water can be gradually reduced due to the resistance of internal rocks after entering the underground reservoir, the hydraulic retention time cannot be lower than the ratio of the length of the underground reservoir to the flow rate of the mine water inlet. According to the water quality index of the in-out water of the in-situ actual coal mine underground reservoir, the background concentration of the tracer is extremely low under the normal condition, and is temporarily not considered in the present disclosure.
Further, the characteristics of the water environment of the underground coal mine reservoir are mastered and analyzed, and the characteristics mainly comprise the chemical type of water in the reservoir, the redox environment, PH, temperature and the like. Because certain components in mine water can react with the tracer under specific water environment characteristics, the tracer amount can be consumed, and therefore, the influence of the inlet and outlet water quality of the underground reservoir and the water environment characteristics in the reservoir on the selection of the tracer type and the determination of the tracer addition amount needs to be fully analyzed.
Further, the physicochemical properties of the collapsed rock in the underground coal mine reservoir are mastered and analyzed, and the physicochemical properties mainly comprise mineral types, element contents, specific surface area, porosity and the like. Since the rock, water and tracer are subjected to water-rock coupling and most of the rock surface is mesoporous, the tracer is adsorbed, and the type and the dosage of the tracer are affected.
Further, according to the water inlet and outlet conditions, water environment characteristics, physical and chemical properties of rock and the like of the underground coal mine reservoir, a proper tracer is selected, and the addition amount is estimated. The reagents for the tracer test mainly comprise pigments, fluorescein substances, plankton substances, radioactive isotopes and ionic compounds. The method and the device comprehensively consider the characteristics and the characteristics of the tracer, ensure the purpose and the requirement of a tracing experiment, select potassium iodide (KI) as the tracer to carry out the tracing experiment, and calculate and obtain the addition amount according to the laboratory analogue simulation test data.
Further, the tracer potassium iodide (KI) in a predetermined amount is poured into a container and a proper amount of water is added thereto, and the mixture is sufficiently stirred until the mixture is completely dissolved, and the initial potassium iodide (KI) concentration C0 can be determined by calculation.
Further, a tracer experiment was performed. The prepared potassium iodide (KI) solution is injected into a water inlet pipe of an underground reservoir (4), namely a tracer delivery position, and the potassium iodide (KI) can flow along the gradient direction of the underground reservoir along with mine water in the reservoir and finally flows out of a water outlet pipe of the underground reservoir (5), namely a tracer receiving position, and the potassium iodide (KI) solution is shown in figures 3 and 4. Therefore, the water sample of the water outlet pipe (5) can be collected, the change characteristic of the concentration Cn of potassium iodide (KI) in the water sample along with time can be detected by utilizing a related instrument, and the hydraulic retention time of the underground coal mine reservoir can be determined according to a set calculation method. Wherein, the sampling time and frequency of the water outlet pipe of the underground reservoir (5) are set as follows: sampling test can be performed every 15 days in the pre-stage of potassium iodide detection, and sampling test can be performed every 1 day in the stage of potassium iodide detection until the detected concentration of potassium iodide reaches the maximum peak value and then approaches the background concentration of the water outlet again. The method for detecting the concentration of potassium iodide in the present disclosure adopts an ion electrode method, and specifically comprises the following steps: ion concentration was measured using a digital ion meter as the ion selective electrode for potassium iodide anions. The principle is that when the iodine ion selective electrode and the reference electrode are connected with the ion meter, after the iodine ion selective electrode and the reference electrode are immersed into the measured solution, a passage is formed between the two electrodes, a certain potential difference is generated between the sensitive film of the ion electrode and the solution, and the relationship between the potential difference and the ion activity a in the solution accords with Nernst equation in the electrochemical theory:
Wherein: e is the potential value generated by the electrode system; e 0 is the value of the intercept potential of the electrode system, which can be regarded as a constant under certain conditions; r is a gas constant (size 8.314J/o.mol); f is Faraday constant (size 9.65X104C/mol); z is the valence of the trace ion; t is the absolute temperature of the solution (273+t ℃); a is the trace ion activity. It has a relation of a=f·c to the concentration C of the trace ion, f being the activity coefficient. Measuring an intercept potential value E0 by an instrument; at the time of sampling measurement, the potassium iodide ion concentration C n can be obtained from the measured potential value E according to the formula (1).
Further, comparing the concentration Cn of the water sample potassium iodide (KI) of the water outlet pipe (5) with the initial concentration C0, setting C n≥mC0 (m can take a value of 1% -30% according to the detection result) as a judging condition, if the condition is met, then C n can be used as an effective value of the concentration of potassium iodide, otherwise, the concentration is an ineffective value. As shown by the laboratory simulation experiment results, after the tracer enters the underground reservoir, the mine water in the reservoir can dilute the tracer to a very low concentration, and the concentration of the tracer at the water outlet is not more than 30% of the initial concentration C 0 of the tracer.
Further, using the time days corresponding to the effective C n as the hydraulic retention time of the underground coal mine reservoir, if a plurality of time values T 1、T2、……、Tn (in days) are obtained, all entering a data processing platform for statistics, and finally obtaining the time range that the hydraulic retention time of the underground coal mine reservoir is T Minimum of ～T Maximum value ; the main steps are shown in fig. 2, so that the hydraulic retention time of the underground coal mine reservoir is tested.
It should be noted that, for simplicity of description, the foregoing method embodiments are all described as a series of acts, but it should be understood by those skilled in the art that the present disclosure is not limited by the order of acts described, as some steps may be performed in other orders or concurrently in accordance with the present disclosure. Further, those skilled in the art will also appreciate that the embodiments described in the specification are all alternative embodiments, and that the acts and modules referred to are not necessarily required by the present disclosure.
The foregoing is a description of embodiments of the method, and the following further describes embodiments of the present disclosure through examples of apparatus.
Fig. 5 illustrates a block diagram of a test apparatus 500 for hydraulic retention time of a coal mine underground reservoir according to an embodiment of the present disclosure. As shown in fig. 5, the apparatus 500 includes:
The first obtaining module 510 is configured to obtain water environment characteristics and rock physicochemical properties of the underground coal mine reservoir;
A processing module 520 for selecting a tracer and determining an initial concentration of the tracer based on the water environmental characteristics and the rock physicochemical properties;
A second obtaining module 530, configured to obtain a measured concentration of the tracer at a water outlet pipe of the underground coal mine reservoir after the tracer is delivered to the water inlet pipe of the underground coal mine reservoir according to the initial concentration;
A prediction module 540 for predicting the hydraulic retention time based on the measured concentration of the tracer.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the described modules may refer to corresponding procedures in the foregoing method embodiments, which are not described herein again.
The present disclosure also provides, in accordance with embodiments of the present disclosure, an electronic device and a non-transitory computer-readable storage medium storing computer instructions.
Fig. 6 shows a schematic block diagram of an electronic device 600 that may be used to implement embodiments of the present disclosure. Electronic devices are intended to represent various forms of digital computers, such as laptops, desktops, workstations, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device may also represent various forms of mobile devices, such as personal digital processing, cellular telephones, smartphones, wearable devices, and other similar computing devices. The components shown herein, their connections and relationships, and their functions, are meant to be exemplary only, and are not meant to limit implementations of the disclosure described and/or claimed herein.
The device 600 includes a computing unit 601 that can perform various suitable actions and processes according to computer programs stored in a Read Only Memory (ROM) 602 or loaded from a storage unit 608 into a Random Access Memory (RAM) 603. In the RAM 603, various programs and data required for the operation of the device 600 may also be stored. The computing unit 601, ROM 602, and RAM 603 are connected to each other by a bus 604. An input/output (I/O) interface 605 is also connected to bus 604.
Various components in the device 600 are connected to the I/O interface 605, including: an input unit 606 such as a keyboard, mouse, etc.; an output unit 607 such as various types of displays, speakers, and the like; a storage unit 608, such as a magnetic disk, optical disk, or the like; and a communication unit 609 such as a network card, modem, wireless communication transceiver, etc. The communication unit 609 allows the device 600 to exchange information/data with other devices via a computer network, such as the internet, and/or various telecommunication networks.
The computing unit 601 may be a variety of general and/or special purpose processing components having processing and computing capabilities. Some examples of computing unit 601 include, but are not limited to, a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), various specialized Artificial Intelligence (AI) computing chips, various computing units running machine learning model algorithms, a Digital Signal Processor (DSP), and any suitable processor, controller, microcontroller, etc. The computing unit 601 performs the various methods and processes described above, such as method 100. For example, in some embodiments, the method 100 may be implemented as a computer software program tangibly embodied on a machine-readable medium, such as the storage unit 608. In some embodiments, part or all of the computer program may be loaded and/or installed onto the device 600 via the ROM 602 and/or the communication unit 609. One or more of the steps of the method 100 described above may be performed when a computer program is loaded into the RAM 603 and executed by the computing unit 601. Alternatively, in other embodiments, the computing unit 601 may be configured to perform the method 100 by any other suitable means (e.g., by means of firmware).
Various implementations of the systems and techniques described here above may be implemented in digital electronic circuitry, integrated circuit systems, field Programmable Gate Arrays (FPGAs), application Specific Integrated Circuits (ASICs), application Specific Standard Products (ASSPs), systems On Chip (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and/or combinations thereof. These various embodiments may include: implemented in one or more computer programs, the one or more computer programs may be executed and/or interpreted on a programmable system including at least one programmable processor, which may be a special purpose or general-purpose programmable processor, that may receive data and instructions from, and transmit data and instructions to, a storage system, at least one input device, and at least one output device.
Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program code may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus such that the program code, when executed by the processor or controller, causes the functions/operations specified in the flowchart and/or block diagram to be implemented. The program code may execute entirely on the machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
In the context of this disclosure, a machine-readable medium may be a tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium may be a machine-readable signal medium or a machine-readable storage medium. The machine-readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of a machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to a user; and a keyboard and pointing device (e.g., a mouse or trackball) by which a user can provide input to the computer. Other kinds of devices may also be used to provide for interaction with a user; for example, feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form, including acoustic input, speech input, or tactile input.
The systems and techniques described here can be implemented in a computing system that includes a background component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front-end component (e.g., a user computer having a graphical user interface or a web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such background, middleware, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local Area Networks (LANs), wide Area Networks (WANs), and the internet.
The computing system may include clients and servers. The client and server are typically remote from each other and typically interact through a communication network. The relationship of client and server arises by virtue of computer programs running on the respective computers and having a client-server relationship to each other. The server may be a cloud server, a server of a distributed system, or a server incorporating a blockchain.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel or sequentially or in a different order, provided that the desired results of the technical solutions of the present disclosure are achieved, and are not limited herein.
The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (10)
1. The method for testing the hydraulic retention time of the underground coal mine reservoir is characterized by comprising the following steps of:
Acquiring water environment characteristics and rock physicochemical properties of the coal mine underground reservoir;
selecting a tracer according to the water environment characteristics and the physicochemical properties of the rock, and determining the initial concentration of the tracer;
After the tracer is thrown into the water inlet pipe of the coal mine underground reservoir according to the initial concentration, the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir is obtained;
The hydraulic retention time is predicted from the measured concentration of the tracer.
2. The method according to claim 1, wherein the method further comprises:
acquiring investigation data of the coal mine underground reservoir;
determining the size and gradient of the underground coal mine reservoir according to the exploration data;
and determining the position of the water inlet pipe and the position of the water outlet pipe according to the size of the coal mine underground reservoir and the gradient.
3. The method of claim 1, wherein said predicting said hydraulic retention time based on a measured concentration of said tracer comprises:
judging whether the measured concentration of the tracer is less than or equal to the product of the initial concentration and a preset coefficient, wherein the preset coefficient is more than 0 and less than or equal to 30%;
And predicting the hydraulic retention time according to the judging result.
4. The method of claim 3, wherein the step of,
Predicting the hydraulic retention time according to the judgment result, including:
if the measured concentration of the tracer is smaller than or equal to the measured concentration, judging that the measured concentration of the tracer is effective, otherwise, judging that the measured concentration of the tracer is ineffective;
And predicting the hydraulic retention time according to the measurement time corresponding to the effective measured concentration of the tracer.
5. The method of claim 1, wherein the step of determining the position of the substrate comprises,
The step of obtaining the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir comprises the following steps:
Measuring the measured concentration of the tracer at the water outlet pipe according to a first preset period;
And when the measured concentration of the tracer at the water outlet pipe is not equal to zero, acquiring the measured concentration of the tracer at the water outlet pipe according to a second preset period, and stopping measuring when the difference value between the measured concentration and the background concentration of the tracer at the water outlet pipe is smaller than a preset threshold value after the measured concentration reaches a maximum peak value, wherein the background concentration is the concentration of the tracer at the water outlet pipe when the tracer is not put into the underground coal mine reservoir, and the first preset period is larger than the second preset period.
6. The method of claim 5, wherein the step of determining the position of the probe is performed,
And determining the initial measurement time according to the first preset period according to the length of the coal mine underground reservoir and the flow rate of the water inlet.
7. The method of claim 1, wherein the step of determining the position of the substrate comprises,
The step of obtaining the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir comprises the following steps:
And measuring the measured concentration of the tracer at the water outlet pipe according to an ion electrode method, wherein the tracer comprises potassium iodide.
8. The method according to any one of claims 1 to 7, wherein,
The water environment characteristics include at least one of: the water chemistry type, the oxidation environment, the PH and the temperature of the coal mine underground reservoir;
the rock physicochemical properties include at least one of: mineral type, element content, specific surface area, and porosity.
9. The utility model provides a colliery underground reservoir hydraulic power dwell time's testing arrangement which characterized in that includes:
The first acquisition module is used for acquiring the water environment characteristics and the rock physicochemical properties of the coal mine underground reservoir;
the processing module is used for selecting a tracer according to the water environment characteristics and the physicochemical properties of the rock and determining the initial concentration of the tracer;
the second acquisition module is used for acquiring the measured concentration of the tracer at the water outlet pipe of the coal mine underground reservoir after the tracer is thrown into the water inlet pipe of the coal mine underground reservoir according to the initial concentration;
And the prediction module is used for predicting the hydraulic retention time according to the measured concentration of the tracer.
10. An electronic device, comprising:
At least one processor; and
A memory communicatively coupled to the at least one processor; wherein,
The memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1-8.
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