A groundwater environmental monitoring well bottom mud sample collector and sampling method

Abstract

The application provides a groundwater environment monitoring well bottom mud sample collector and a sampling method, and relates to the technical field of environmental detection. The collector comprises a downhole assembly, and the downhole assembly comprises: a sampling module, which comprises a sample bin, a driving unit and a first pressure sensor, the bottom of the sample bin is provided with an openable and closable sampling opening, the driving unit is used for driving the sample bin to move, a second pressure sensor is further arranged in the sample bin, a fixing module is fixedly connected to the sampling module, the fixing module comprises a telescopic fixing frame, the distal end of the fixing frame is provided with an antiskid piece and a third pressure sensor; and a control module is used for controlling the fixing frame, the driving unit and the sampling opening. The sampling method can control the fixing frame, the driving unit and the sampling opening by using the data of the plurality of pressure sensors. The application can be suitable for the bottom mud sampling of a groundwater environment monitoring well with a large depth.

Description

Technical Field

[0001] This invention relates to the field of environmental monitoring technology, and in particular to a sampler and sampling method for sediment samples from the bottom of groundwater environmental monitoring wells. Background Technology

[0002] Bottom sediment, also known as aquatic sediment, is a mixture of clay, silt, organic matter, and various minerals that is deposited at the bottom of water bodies after long-term physical, chemical, and biological processes and water transport. Bottom sediment collection is a crucial step in water quality monitoring and environmental protection. Methods for bottom sediment collection include surface sampling, columnar sampling, and trawl sampling. Commonly used samplers are suitable for collecting surface sediment or deep samples from large operating spaces.

[0003] However, commonly used sediment samplers are not suitable for groundwater environmental monitoring wells. Groundwater environmental monitoring wells are characterized by small diameters and deep depths, with diameters mostly ranging from 50cm to 100cm (50mm to 150mm) and depths exceeding 100 meters. Existing samplers are not suitable for collecting sediment samples from small work areas or from samples collected over large spatial distances. Summary of the Invention

[0004] In a first aspect, the present invention provides a groundwater environment monitoring well bottom sediment sampler, comprising a downhole component, the downhole component including: The sampling module includes a sample chamber, a drive unit, and a first pressure sensor. The first pressure sensor is used to obtain the pressure of the sample chamber in contact with the bottom sediment. The bottom of the sample chamber is provided with an openable sampling opening. The drive unit is used to drive the sample chamber to move downward. A second pressure sensor is also provided inside the sample chamber. The second pressure sensor is used to obtain the pressure of the bottom sediment inside the sample chamber on the sample chamber. A fixed module is fixedly connected to the sampling module. The fixed module includes a retractable fixing frame. The end of the fixing frame is provided with an anti-slip component and a third pressure sensor. The fixing frame is used to fix to the inner wall of the monitoring well, and the third pressure sensor is used to obtain the pressure received by the fixing frame from the inner wall of the monitoring well. The control module is used to acquire data from the first pressure sensor of the sampling module and control the fixing frame. The control module is also used to acquire data from the third pressure sensor and control the drive unit to drive the sample chamber to move downward. The control module is also used to acquire pressure data from the second pressure sensor and control the closing of the sampling opening.

[0005] In an optional implementation, the sampling opening includes at least six sets of arc-shaped blades, which converge or disperse synchronously toward the center to close or open the sampling opening.

[0006] In an optional implementation, the curved blades are hydraulically driven.

[0007] In an optional implementation, the curved blades are made of metal and have a ceramic coating.

[0008] In an optional embodiment, the second pressure sensor is located on the top surface of the sample chamber cavity.

[0009] In an optional implementation, the driving unit of the sampling module drives the sample chamber to rotate and move downward.

[0010] In an optional implementation, the sample chamber is made of Teflon; or, the sample chamber is made of stainless steel with a ceramic coating.

[0011] In an alternative implementation, the retractable mounting bracket employs an electric drive module or a hydraulic drive module.

[0012] In an optional implementation, the control module may also include a surface control terminal and connecting cables.

[0013] The groundwater environmental monitoring well bottom sediment sampler provided by this invention has the following beneficial effects: 1. The sample chamber samples directly through the bottom sampling opening and is driven downward by the drive unit, making it suitable for groundwater environmental monitoring wells with small areas and allowing sampling work to be completed within a small area; 2. The retractable mounting bracket takes full advantage of the small inner diameter of the groundwater environment monitoring well. After the bracket is extended, it can be fixed to the inner wall of the groundwater environment monitoring well, thereby ensuring stable movement of the sampling chamber when it moves downward and ensuring normal and smooth operation of the sampling action. 3. The sampling opening adopts an openable and closable design, which can be actively closed after sampling to complete the sealing of the sediment sample; 4. The downhole components can independently complete fixation and sampling, and are applicable to groundwater environment monitoring wells at great depths.

[0014] Secondly, the present invention provides a method for collecting sediment samples from the bottom of a groundwater environmental monitoring well, applied to a sediment sample collector for groundwater environmental monitoring wells according to any of the foregoing embodiments, comprising the following steps: The downhole components were lowered into the groundwater environment monitoring well; Acquire data from the first pressure sensor; when the data from the first pressure sensor reaches the first preset pressure value, activate the fixing bracket to extend the fixing bracket. Acquire data from the third pressure sensor. When the data from the third pressure sensor reaches the third preset pressure value, maintain the position of the fixed frame, open the sampling opening of the sample chamber, start the drive unit of the sampling module, and drive the sample chamber to move downward for sampling. Data from the second pressure sensor is acquired. When the data from the second pressure sensor reaches the second preset pressure value, the sampling opening of the sample chamber is closed, the fixing frame is activated to retract, and the downhole component is retrieved from the groundwater environment monitoring well.

[0015] The method for collecting sediment samples from the bottom of groundwater environmental monitoring wells provided by this invention has the following beneficial effects: After the downhole component is lowered into the groundwater environmental monitoring well, the first pressure sensor determines whether the sample chamber has reached the bottom sediment level, which serves as a condition for fixing the downhole component and ensures that the sample chamber can obtain samples normally after it is started. The third pressure sensor determines whether the downhole component has been fixed, which also serves as a condition for starting the sample chamber and ensures that the sample chamber can operate stably during operation. The second pressure sensor determines whether the sample chamber is full of samples, which serves as a condition for closing the sampling opening of the sample chamber and ensures the amount of samples collected. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 A schematic diagram illustrating the usage status of the groundwater environmental monitoring well bottom sediment sampler provided in this embodiment of the invention.

[0018] Icons: 100 - Sample chamber; 200 - Drive unit; 300 - Fixture; 400 - Connecting cable; 500 - Inner wall of monitoring well. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] like Figure 1 As shown, this embodiment of the invention provides a groundwater environment monitoring well bottom sediment sampler, including a downhole component, which includes: The sampling module includes a sample chamber 100, a drive unit 200, and a first pressure sensor. The first pressure sensor is used to obtain the pressure of the sample chamber 100 in contact with the bottom sediment. The bottom of the sample chamber 100 is provided with an openable sampling opening. The drive unit 200 is used to drive the sample chamber 100 to move downward. A second pressure sensor is also provided inside the sample chamber 100. The second pressure sensor is used to obtain the pressure of the bottom sediment inside the sample chamber 100 on the sample chamber 100. A fixed module is fixedly connected to the sampling module. The fixed module includes a retractable fixing frame 300. The end of the fixing frame 300 is provided with an anti-slip component and a third pressure sensor. The fixing frame 300 is used to fix to the inner wall 500 of the monitoring well. The third pressure sensor is used to obtain the pressure received by the fixing frame 300 from the inner wall 500 of the monitoring well. The control module is used to acquire data from the first pressure sensor of the sampling module and control the fixture 300. The control module is also used to acquire data from the third pressure sensor and control the drive unit 200 to drive the sample chamber 100 to move downward. The control module is also used to acquire pressure data from the second pressure sensor and control the closing of the sampling opening.

[0027] Figure 1 This is a schematic diagram of the usage status of the groundwater environment monitoring well bottom sediment sampler provided in an embodiment of the present invention. It shows the state in which the downhole component is located at the bottom of the groundwater environment monitoring well, and at this time, no sampling is being performed.

[0028] like Figure 1 As shown, the sample chamber 100 directly samples through a bottom sampling opening, and the driving unit 200 drives the sample chamber 100 to move downwards. This design makes it suitable for groundwater environmental monitoring wells with small areas, allowing sampling to be completed within a limited space. Compared to existing sampling devices, this invention is more suitable for use in smaller environments.

[0029] In this embodiment, as Figure 1 As shown, the retractable mounting bracket 300 makes full use of the small inner diameter of the groundwater environment monitoring well. After the mounting bracket 300 extends, it can be fixed to the inner wall 500 of the groundwater environment monitoring well, thereby ensuring stable movement of the sampling chamber when it moves downward and ensuring normal and smooth operation of the sampling action.

[0030] The sampling opening is designed to be openable and closable, and can be actively closed after sampling to seal the bottom sediment sample; the downhole component can independently complete fixation and sampling, and can be applied to groundwater environmental monitoring wells at great depths.

[0031] The sampling method for the groundwater environmental monitoring well bottom sediment sampler provided in this embodiment includes the following steps: The downhole components were lowered into the groundwater environment monitoring well; The data from the first pressure sensor is acquired. When the data from the first pressure sensor reaches the first preset pressure value, the fixing bracket 300 is activated to extend the fixing bracket 300. The data from the third pressure sensor is acquired. When the data from the third pressure sensor reaches the third preset pressure value, the position of the fixed frame 300 is maintained, the sampling opening of the sample chamber 100 is opened, and the driving unit 200 of the sampling module is started to drive the sample chamber 100 to move downward for sampling. The data from the second pressure sensor is acquired. When the data from the second pressure sensor reaches the second preset pressure value, the sampling opening of the sample chamber 100 is closed, and the fixing frame 300 is activated to retract, thereby retrieving the downhole component from the groundwater environment monitoring well.

[0032] The sampling method for the sediment sampler in the groundwater environmental monitoring well provided in this embodiment, after the well assembly is lowered into the groundwater environmental monitoring well, uses a first pressure sensor to determine whether the sample chamber 100 has reached the sediment position, which serves as a condition for fixing the well assembly and ensures that the sample chamber 100 can normally acquire samples after startup; uses a third pressure sensor to determine whether the well assembly has been fixed, which serves as a condition for starting the sample chamber 100 and ensures that the sample chamber 100 can operate stably when it is activated; and uses a second pressure sensor to determine whether the sample chamber 100 is full of samples, which serves as a condition for closing the sampling opening of the sample chamber 100 and ensures the sample volume.

[0033] After the downhole component is retrieved from the groundwater environmental monitoring well, the sample can be taken out from the sample chamber 100 by inverting the downhole component so that the sampling opening faces upward.

[0034] In some embodiments, the sample chamber 100 moves downward to a depth of 50cm under the action of the driving unit 200, that is, the inner cavity depth is 50cm, so as to ensure that enough bottom sediment samples can be obtained.

[0035] In some embodiments, the operation of the driving component can also be used as a condition for determining whether to close the sampling opening of the sample chamber 100. Specifically, when the driving component can no longer drive the sample chamber 100 to move downward, the closing operation of the sampling opening of the sample chamber 100 can be initiated.

[0036] In some embodiments, the sampling opening includes at least six sets of arc-shaped blades, which simultaneously converge or diverge towards the center to close or open the sampling opening. More specifically, the number of arc-shaped blades can be between six and nine. This type of structure has applications in fields such as camera lenses, but not specifically in the field of samplers. This type of sampling opening can achieve good opening and closing effects while ensuring a small structural size, making it particularly suitable for sampling in groundwater environmental monitoring wells.

[0037] In some embodiments, the curved blades are made of metal and have a ceramic coating. On the one hand, the metal material can ensure the structural strength of the blades, and on the other hand, the ceramic coating can prevent the blades from reacting with the sediment and affecting the analysis of sample properties.

[0038] In some embodiments, the arc-shaped blades are hydraulically driven to ensure a sealing effect. In particular, when the sample chamber 100 is drilled into the bottom mud, the blades need to overcome the resistance of the bottom mud when closing. The hydraulic drive can ensure that the blades overcome the resistance of the bottom mud and complete the full closure.

[0039] In some embodiments, the second pressure sensor is disposed on the top surface of the inner cavity of the sample chamber 100. The second pressure sensor is used to obtain the pressure exerted by the bottom sediment in the sample chamber 100 on the sample chamber 100, and uses this as a standard to determine whether the bottom sediment in the sample chamber 100 is full. Disposing the second pressure sensor on the top surface of the inner cavity of the sample chamber 100 can avoid interference from other factors and ensure that the second pressure sensor can only obtain the corresponding data when the bottom sediment fills the sample chamber 100.

[0040] In some embodiments, the driving unit 200 of the sampling module drives the sample chamber 100 to rotate and move downward. The sample chamber 100 needs to move downward to drill into the sediment for sampling. Driving the sample chamber 100 to rotate at this time makes it easier for the sample chamber 100 to move downward and avoids the obstruction of movement due to sediment accumulation or other reasons.

[0041] In some embodiments, the sample chamber 100 is made of Teflon; or, the sample chamber 100 is made of stainless steel with a ceramic coating. Whether using Teflon or stainless steel with a ceramic coating, structural strength is ensured while preventing reaction with the sediment sample, thus guaranteeing the accuracy of sediment sample analysis.

[0042] In some embodiments, the retractable mounting bracket 300 employs an electric drive module or a hydraulic drive module. The dimensions of the mounting bracket 300 can also be configured in various sizes to suit different groundwater monitoring wells, or the dimensions of the mounting bracket 300 can be adjusted within a common size range. The mounting bracket 300 can output a pressure of at least 200N to ensure adequate fixation to the inner wall 500 of the groundwater monitoring well.

[0043] In some embodiments, the control module further includes a surface control terminal and a connecting cable 400. The surface control terminal is used to output and input control information, realize product monitoring, and perform remote control or manual access, etc. For example, after sampling is completed, the surface control terminal can output a sampling completion prompt signal to facilitate the operator to initiate the operation of pulling up the downhole component. The connecting cable 400 can be used for power supply, lowering and extraction of the downhole component, output of control signals, etc., and can specifically be a pressure-resistant and waterproof cable with a tensile strength of not less than 500 kg.

[0044] In some embodiments, the downhole assembly may also be equipped with a battery pack, which can be used to power some components of the downhole assembly.

[0045] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A groundwater environmental monitoring well bottom sediment sampler, characterized in that, Includes downhole components, said downhole components comprising: The sampling module includes a sample chamber (100), a drive unit (200), and a first pressure sensor. The first pressure sensor is used to obtain the pressure of the sample chamber (100) in contact with the bottom sediment. The bottom of the sample chamber (100) is provided with an openable sampling opening. The drive unit (200) is used to drive the sample chamber (100) to move downward. The sample chamber (100) is also provided with a second pressure sensor, which is used to obtain the pressure of the bottom sediment in the sample chamber (100) on the sample chamber (100). A fixed module is fixedly connected to the sampling module. The fixed module includes a retractable fixing frame (300). The end of the fixing frame (300) is provided with an anti-slip component and a third pressure sensor. The fixing frame (300) is used to fix itself to the inner wall (500) of the monitoring well. The third pressure sensor is used to obtain the pressure received by the fixing frame (300) from the inner wall (500) of the monitoring well. The control module is used to acquire data from the first pressure sensor of the sampling module and control the fixture (300). The control module is also used to acquire data from the third pressure sensor and control the drive unit (200) to drive the sample chamber (100) to move downward. The control module is also used to acquire pressure data from the second pressure sensor and control the sampling opening to close.

2. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The sampling opening includes at least six sets of arc-shaped blades, which converge or disperse synchronously toward the center to close or open the sampling opening.

3. The groundwater environmental monitoring well bottom sediment sampler according to claim 2, characterized in that, The curved blades are hydraulically driven.

4. The groundwater environmental monitoring well bottom sediment sampler according to claim 2, characterized in that, The curved blades are made of metal and have a ceramic coating.

5. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The second pressure sensor is located on the top surface of the inner cavity of the sample chamber (100).

6. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The driving unit (200) of the sampling module drives the sample chamber (100) to rotate and move downward.

7. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The sample chamber (100) is made of Teflon material; or, the sample chamber (100) is made of stainless steel and has a ceramic coating.

8. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The retractable mounting bracket (300) is powered by an electric drive module or a hydraulic drive module.

9. The groundwater environmental monitoring well bottom sediment sampler according to claim 1, characterized in that, The control module also includes a surface control terminal and a connecting cable (400).

10. A method for collecting sediment samples from the bottom of a groundwater environmental monitoring well, characterized in that, The application of the groundwater environmental monitoring well bottom sediment sample collector according to any one of claims 1-9 includes the following steps: The downhole components were lowered into the groundwater environment monitoring well; Data from the first pressure sensor is acquired. When the data from the first pressure sensor reaches the first preset pressure value, the fixing bracket (300) is activated to extend the fixing bracket (300). Acquire data from the third pressure sensor. When the data from the third pressure sensor reaches the third preset pressure value, maintain the position of the fixed frame (300), open the sampling opening of the sample chamber (100), start the driving unit (200) of the sampling module, and drive the sample chamber (100) to move downward for sampling. Data from the second pressure sensor is acquired. When the data from the second pressure sensor reaches the second preset pressure value, the sampling opening of the sample chamber (100) is closed, and the fixing frame (300) is activated to retract the fixing frame (300) and retract the downhole component from the groundwater environment monitoring well.

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