Gas collection device for earthquake monitoring
By designing an air collecting device that does not need to be connected to the drain pipe, and a built-in inclined filter and conical pipe structure, the instability problem caused by the existing air collecting device due to the blockage and interference factors of the inlet and outlet water pipes is solved, and a more stable Gas acquisition and data accuracy.
Patent Information
- Application Number
- CN202421047963.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-15
- Publication Date
- 2024-12-20
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
During long-term use, existing gas collecting devices are prone to interference factors caused by blockage of inlet and outlet pipes and slight changes, resulting in unstable gas collection volume and affecting the accuracy of seismic monitoring data.
A gas collecting device that does not need to be connected to the drain pipe is designed, and a built-in filter and conical tube structure is adopted. The filter is arranged inclined to avoid impurities blockage, and is combined with the ventilated tube through a combination of the conical tube and the outer wire tube. The connecting air pipe is placed in a vertical position to reduce condensation water interference, and the material is made of stainless steel to improve corrosion resistance.
A more stable gas collection is achieved, which reduces interference factors, avoids impurities blockage in water and condensate interference, and improves the directness of data and the stability of long-term use.
Smart Images
Figure CN222212962U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of earthquake monitoring, in particular to a gas collecting device used for earthquake monitoring. Background Art
[0002] The stability of gas collection devices has always been a technical obstacle that restricts the development of seismic chemical quantity observation. Since the development in the 1970s, there have been "traditional natural gas collection devices", "splashing gas collection devices", "bubbling gas collection devices", "horizontal gas collection devices", "self-priming gas collection devices", etc. Among the above types of gas collection devices, the traditional natural gas collection device introduces the leakage waterway into a buffer space, which forms a natural gas storage space, and the water is naturally discharged. Other types of gas collection devices all use water from the leakage pipeline (or branch) to introduce water into the gas collection device, collect the gas in the water and discharge the wastewater through different methods, and transport the gas from the gas path to the instrument for observation. Its essence is an evolution of the traditional natural gas collection device, and some methods are used in the device to increase the gas collection volume and improve the gas collection efficiency.
[0003] Taking the splash gas collection device as an example, its basic structure and principle is to introduce the well leakage waterway from the upper end of the device, and the incoming water flow splashes onto the small umbrella-shaped device at the lower end of the device to achieve the escape of gas in the water. The entire device is in a cavity state, and the collected gas can only be input into the instrument from another gas outlet at the upper end of the device. A drain port is set at the lower end of the device, and the drain port and the water inlet pipe diameter are adapted to meet the balance of water intake and drainage. Since the space of the gas collection device is limited and the cavity capacity is generally between 0.5L-5L, the gas collection device is usually connected to the leakage branch water flow.
[0004] The main disadvantage of existing gas collection devices is that each gas collection device is connected to the drainage waterway. Due to the small diameter of the water inlet and drainage pipes of the gas collection device, there are impurities in the underground fluid flowing in and out, and the aperture will become smaller or even blocked after long-term use; secondly, any slight change in the entire drainage pipeline (such as water sampling, water level calibration and other operations) will cause changes in water flow pressure and flow, causing the inlet and outlet water of the gas collection device to be affected by fluctuations, which in turn causes changes in gas collection volume and data. The purpose of seismic monitoring is to obtain changes in the release of deep underground gas by observing the changing laws of gas in groundwater. Any changes caused by other device factors are interference factors.
[0005] Therefore, it is necessary to design a gas collection device with stable gas collection, few interference factors and high stability in long-term use. Utility Model Content
[0006] The utility model aims to provide a gas collecting device for earthquake monitoring to solve the problems existing in the above-mentioned prior art, with high gas collecting stability and few interference factors.
[0007] To achieve the above purpose, the utility model provides the following solutions:
[0008] The utility model provides an air collecting device for earthquake monitoring, comprising a main pipe, a filter and a connecting air pipe; the main pipe has an inner channel inside, and the two ends of the main pipe are respectively a first opening and a second opening connected to the inner channel; the main pipe is used to be placed below or above the water surface of a main well pipe; the first opening is used to be connected and communicated with one end of the connecting air pipe, and the other end of the connecting air pipe is used to be connected and communicated with the air inlet of an observation instrument; the filter is obliquely arranged in the inner channel.
[0009] Preferably, the first opening is connected to one end of the connecting air pipe via a tapered tube, the small end of the tapered tube is connected and communicated with one end of the connecting air pipe, and the large end of the tapered tube is connected and communicated with the first opening.
[0010] Preferably, the connecting air pipe includes an outer wire tube and a soft air tube, one end of the outer wire tube is connected to and communicated with the small mouth end of the conical tube, a plurality of ridges are fixed on the outer side wall of the outer wire tube, one end of the soft air tube is sealingly mounted on the outer wire tube, and the other end of the soft air tube is used to connect and communicate with the air inlet of the observation instrument.
[0011] Preferably, when the axis of the main pipe is parallel to the vertical direction, the inclined surface of the filter screen forms an angle of 60° with the horizontal plane.
[0012] Preferably, the main pipe, the filter screen, the tapered pipe and the outer wire pipe are all made of stainless steel.
[0013] Compared with the prior art, the utility model has achieved the following technical effects:
[0014] The gas collecting device for earthquake monitoring provided by the utility model is placed in the main well pipe for use. Compared with the existing gas collecting devices, it does not need to be connected to the leakage pipe, so it is not disturbed by the factors of the leakage pipe. In addition, based on the fact that the water surface in the main well pipe is more stable, it is less disturbed by other factors when collecting gas, and the gas collection is more stable. Moreover, the gas collection process does not require water to flow through. It is equipped with an internal inclined filter screen, which can filter floating impurities in the water of the main well pipe and accumulate them in the acute angle area formed by the filter screen and the main pipe, so as to avoid impurities in the water clogging the filter screen, resulting in the inability to collect gas. ; and by placing it in the main well pipe for use, the observation instrument can be placed next to the upper wellhead of the main well pipe. In this case of use, most of the connecting air pipes are in a vertical position. Compared with the existing gas collecting device connected to the leakage pipe below the upper wellhead of the main well pipe, which makes the connecting air pipes in a horizontal position, when condensed water droplets are formed inside the connecting air pipe, the connecting air pipe based on the vertical position can be more conducive to the falling of condensed water droplets under the action of their own weight, avoiding continuous location on the inner wall of the connecting air pipe, interfering with the flow of the collected gas in the connecting air pipe, and ensuring the stability of the collected gas volume.
[0015] Furthermore, the conical tube can be more conveniently removed when it is lifted upward from the main well pipe as a whole, reducing the possibility of being blocked by other probes and cables in the well, or even getting stuck in the well and unable to be lifted out, thereby facilitating use.
[0016] Furthermore, the outer wire tube is convenient for connection with the soft air tube, and the multiple ridges on the outer side wall of the outer wire tube can increase the detachment resistance of the soft air tube, forming an anti-loosening effect on the soft air tube.
[0017] Furthermore, the inclined surface of the filter screen is at an angle of 60° to the horizontal plane, which enables floating impurities in the main well pipe water to accumulate more smoothly in the acute angle area along its inclined surface, thereby reducing clogging of the filter screen.
[0018] Furthermore, stainless steel is used, which has a certain corrosion resistance and ensures that the device has a good service life. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0020] Figure 1 This is a schematic diagram of the overall structure of the gas collecting device for earthquake monitoring provided by the utility model;
[0021] Figure 2The overall structural diagram of the gas collecting device for earthquake monitoring provided by the utility model is a schematic diagram of its use in the main well pipe;
[0022] Figure 3 A bottom view of the gas collecting device for earthquake monitoring provided by the utility model;
[0023] Figure 4 A schematic diagram of the structure of a filter screen in a gas collecting device for earthquake monitoring provided by the utility model;
[0024] Figure 5 The data curve of the gas collection device for earthquake monitoring provided by the utility model for 9 days of gas mercury in use;
[0025] Figure 6 This is a data curve of mercury gas collected by the gas collecting device for earthquake monitoring provided by the utility model for two months during use.
[0026] In the figure:
[0027] 100-Gas collecting device for earthquake monitoring;
[0028] 1-main pipe; 2-filter screen; 3-conical pipe; 4-external wire pipe; 5-soft air pipe; 6-main well pipe; 7-leakage pipe; 8-side pressure pipe; 9-flow control valve. DETAILED DESCRIPTION
[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0030] The utility model aims to provide a gas collecting device for earthquake monitoring to solve the problems existing in the prior art, with high gas collecting stability and few interference factors.
[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.
[0032] Embodiment 1
[0033] This embodiment provides a gas collection device 100 for earthquake monitoring, which is mainly but not limited to being used for underground fluid water chemistry observation in seismic underground fluid artesian wells. Figure 1 to Figure 6As shown, it includes a main pipe 1, a filter 2 and a connecting air pipe; the main pipe 1 has an inner channel inside, and the two ends of the main pipe 1 are respectively a first opening and a second opening connected to the inner channel; the main pipe 1 is used to be placed below or above the water surface of the main well pipe 6; the first opening is used to connect and communicate with one end of the connecting air pipe, and the other end of the connecting air pipe is used to connect and communicate with the air inlet of the observation instrument; the filter 2 is obliquely arranged in the inner channel.
[0034] By placing it in the main well pipe 6 for use, compared with the existing gas collection device, it does not need to be connected to the leakage pipe 7, so it is not disturbed by the factors of the leakage pipe 7, and based on the fact that the water surface in the main well pipe 6 is more stable, it is less disturbed by other factors when collecting gas, and the gas collection is more stable; and its gas collection process does not require water to flow through, and it is equipped with an internally inclined filter screen 2, which can filter floating impurities in the water of the main well pipe 6 and accumulate them in the acute angle area formed by the filter screen 2 and the main pipe 1, so as to avoid impurities in the water clogging the filter screen 2, resulting in the inability to collect gas; and by placing it It is placed in the main well pipe 6 for use. At this time, the observation instrument can be placed next to the upper wellhead of the main well pipe 6. In this case of use, most of the connecting air pipes are in a vertical position. Compared with the existing gas collecting device connected to the leakage pipe 7 below the upper wellhead of the main well pipe 6, which makes the connecting air pipes in a horizontal position, when condensed water droplets are formed inside the connecting air pipes, the connecting air pipes based on the vertical position can be more conducive to the falling of condensed water droplets under the action of their own weight, avoiding continuous location on the inner wall of the connecting air pipe, interfering with the flow of the collected gas in the connecting air pipe, and ensuring the stability of the collected gas volume.
[0035] Specifically, earthquake underground fluid artesian wells: The observation wells for earthquake monitoring observe aquifers that are usually underground pressurized water. When the pressurized water level is higher than the ground, an artesian well can be formed. The water head height is controlled by extending the well pipe above the ground, and the well water is discharged from the discharge pipe 7. Since pressurized water can carry information about deep crust and even mantle-derived gases, it is often used for earthquake groundwater chemical observations to carry out earthquake analysis and prediction work.
[0036] Specifically, underground fluid hydrochemistry observations usually include gas components such as mercury, radon, hydrogen, and helium. These gases may be naturally escaped gases in well water or dissolved gases in water. Through devices that can collect these gases, the gases are transported to observation instruments to determine the content of the corresponding gas components. The measured content can be an absolute content or a relative content obtained under certain specific observation conditions. The dynamic changes in gas content are recorded through long-term observations and used to study abnormal information of earthquake precursors.
[0037] Specifically, the gas collecting device 100 for earthquake monitoring of this embodiment is directly immersed in water to collect gas when used in conjunction with hydrogen or helium observation instruments. The device can be partially immersed in water or completely immersed in water; when used with instruments for hourly pumping observation of gas mercury, gas radon, etc., it cannot be immersed in water. It can be suspended one to two meters above the water head of the well, and the gas collection effect is good. The placement position is based on the principle of not contacting the well water, so as to avoid water being drawn into the soft air pipe 5 during the instrument's pumping observation, causing data impact or instrument damage, and also affecting the well water level observation data.
[0038] Specifically, Figure 2 As shown, the main well pipe 6 is connected to the leakage pipe 7, the leakage pipe 7 is provided with a flow control valve 9, and the front end of the leakage pipe 7 is also provided with a side pressure pipe 8 (a water head pressure inspection pipe on the side of the main well mouth, which forms a connecting pipe with the main well pipe 6 through the leakage pipe 7. The water head in the side pressure pipe 8 is consistent with the main well pipe 6, which can be used as an auxiliary device for water level calibration in daily observation. Usually, the side pressure pipe 8 is marked with scales, with the center line of the leakage pipe 7 as 0 starting point upward, the scale unit is a length unit, and the resolution is to mm), which is used to display the liquid level in the main well pipe 6.
[0039] Specifically, the upper end of the soft gas pipe 5 of the gas collecting device 100 for earthquake monitoring of this embodiment is located at the second floor plane, and the leakage pipe 7 is located between the second floor plane and the ground plane.
[0040] In order to reduce the obstruction of the gas collecting device 100 for seismic monitoring by other equipment or wiring harnesses in the well when the main well pipe 6 is raised, the following settings can be made:
[0041] Among the optional solutions of this embodiment, it is more preferred that Figure 1 and Figure 2 As shown, the first opening is connected to one end of the connecting air pipe through the tapered tube 3, the small end of the tapered tube 3 is connected and communicated with one end of the connecting air pipe, and the large end of the tapered tube 3 is connected and communicated with the first opening. The provided tapered tube 3 can be more conveniently taken out when it is lifted upward from the main well pipe 6, reducing the obstruction of other probes and cables in the well when it is lifted out, or even the situation where it is stuck in the well and cannot be lifted out, and is convenient for use.
[0042] Among them, the structure connecting the trachea:
[0043] Among the optional solutions of this embodiment, it is more preferred that Figure 2As shown, the connecting trachea includes an outer wire tube 4 and a soft trachea 5, one end of the outer wire tube 4 is connected and communicated with the small end of the tapered tube 3, a plurality of convex ridges are fixed on the outer side wall of the outer wire tube 4, one end of the soft trachea 5 is sleeved and sealed and installed on the outer wire tube 4, and the other end of the soft trachea 5 is used to connect and communicate with the air inlet of the observation instrument. The outer wire tube 4 is convenient for connection with the soft trachea 5, and the plurality of convex ridges on the outer side wall of the outer wire tube 4 can increase the disengagement resistance of the soft trachea 5, forming an anti-loosening effect on the soft trachea 5.
[0044] Among them, for the inclination setting of the filter screen 2:
[0045] Among the optional solutions of this embodiment, it is more preferred that Figure 1 As shown, when the axis of the main pipe 1 is parallel to the vertical direction, the inclined surface of the filter screen 2 forms an angle of 60° with the horizontal plane. The inclined surface of the filter screen 2 forms an angle of 60° with the horizontal plane, which enables floating impurities in the water of the main well pipe 6 to accumulate more smoothly along its inclined surface in the acute angle area, reducing the blockage of the filter screen 2.
[0046] Among them, regarding the material of the gas collecting device 100 for earthquake monitoring:
[0047] In the optional scheme of this embodiment, it is more preferred that the main pipe 1, the filter screen 2, the tapered pipe 3 and the outer wire pipe 4 are all made of stainless steel. The stainless steel material can have a certain corrosion resistance and ensure that the device has a good service life.
[0048] Specifically, the soft air tube 5 is made of PVC material.
[0049] A specific dimension setting description of the gas collecting device 100 for earthquake monitoring is as follows:
[0050] The main pipe 1 is made of stainless steel, which is a φ80mm stainless steel cylinder, 300mm long, with upper and lower openings;
[0051] A stainless steel filter screen 2 is welded inside the main pipe 1. The filter screen 2 is made of an elliptical stainless steel plate with a thickness of 1 mm, a long axis of 160 mm, and a short axis of 80 mm. Circular holes with a diameter of 8 mm are evenly punched on the stainless steel plate. About 40 mm on one side of the long axis is left unpunched. The filter screen 2 is welded at a position of 50 mm inside the main pipe 1 at an angle of 30°. The unpunched side is welded close to the far end and forms an acute angle area with part of the inner wall of the main pipe 1.
[0052] The end of the main pipe 1 away from the filter screen 2 is the upper end, which is welded and sealed with a tapered pipe 3 with an opening of φ80mm and a height of 120mm, and polished smooth. The top opening of the tapered pipe 3 is covered with a 0.93mm thread, which is tightened and fixed with a 0.93mm outer threaded pipe 4 at the upper end. The outer threaded pipe 4 is 100mm long and can be connected and fixed with a PVC soft air pipe 5. The other end of the soft air pipe 5 is connected to the air inlet of the observation instrument.
[0053] Among them, the explanation about earthquake precursor observation is as follows:
[0054] The monitoring effectiveness of earthquake precursor observation can generally be evaluated from four aspects. The first is the monitoring capability of earthquake precursors, that is, whether abnormal information related to earthquake activities can be recorded; the second is whether the changes in the earth's solid tide can be recorded; the third is whether the co-seismic effect can be recorded; and the last is the signal-to-noise ratio (Che Yongtai et al., 2015). It can be seen that recording the changes in the solid tide is an important indicator for evaluating the monitoring effectiveness.
[0055] Figure 5 The 9-day data curve of observed gas mercury has clear daily variation and good reproducibility. Figure 6 This is the observation data of Mercury Gas for 2 months. From the long-term data curve, we can see the changes in solid tides recorded in the data. The boxes are the low tide periods on the 7th, 8th, 21st and 22nd of each lunar month, which alternate with the high tide periods, showing obvious patterns of solid tide changes.
[0056] From the test output data, the gas collection device 100 for earthquake monitoring of this embodiment can significantly reduce various data interference factors. The observed data more directly reflects the change pattern of deep underground gas. The data curve is synchronized with the change of the earth's solid tide. The data quality and monitoring efficiency are significantly improved, and it is highly stable without clogging during long-term use.
[0057] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of the present invention. At the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.
Claims
1. A gas collecting device for earthquake monitoring, Features: Including main pipe, filter screen and connecting air pipe; The main pipe has an inner passage inside, and the two ends of the main pipe are respectively a first opening and a second opening connected to the inner passage; the main pipe is used to be placed below or above the water surface of the main well pipe; The first opening is used to be connected to and communicated with one end of the connecting air pipe, and the other end of the connecting air pipe is used to be connected to and communicated with the air inlet of the observation instrument; The filter screen is arranged obliquely in the inner channel.
2. The gas collecting device for earthquake monitoring according to claim 1, Features: The first opening is connected to one end of the connecting air pipe through a tapered tube, the small end of the tapered tube is connected and communicated with one end of the connecting air pipe, and the large end of the tapered tube is connected and communicated with the first opening.
3. The gas collecting device for earthquake monitoring according to claim 2, Features: The connecting air pipe includes an outer wire tube and a soft air pipe. One end of the outer wire tube is connected and communicated with the small mouth end of the conical tube. A plurality of ridges are fixed on the outer side wall of the outer wire tube. One end of the soft air pipe is sealingly mounted on the outer wire tube, and the other end of the soft air pipe is used to connect and communicate with the air inlet of the observation instrument.
4. The gas collecting device for earthquake monitoring according to claim 1, Features: When the axis of the main pipe is parallel to the vertical direction, the inclined surface of the filter screen forms an angle of 60° with the horizontal plane.
5. The gas collecting device for earthquake monitoring according to claim 3, Features: The main pipe, the filter screen, the conical pipe and the outer wire pipe are all made of stainless steel.