A remote well gas sampling device based on negative pressure suction

Abstract

This utility model discloses a remote well gas sampling device based on negative pressure suction, comprising a suction pipeline, a sampling pipeline, and a venturi tube; one end of the suction pipeline extends into the bottom of the well, and the other end is connected to the sampling pipeline; the sampling pipeline is connected to the throat of the venturi tube, used to suction gas from the well using negative pressure after instrument air is introduced into the venturi tube; the negative pressure end of the venturi tube is connected to the instrument measuring cell. This device has a simple structure, is easy to install, and is convenient and safe to maintain.

Description

Technical Field

[0001] This utility model relates to the field of industrial safety monitoring equipment technology, and in particular to a remote well gas sampling device based on negative pressure suction. Background Technology

[0002] Currently, in the field of industrial safety monitoring equipment, gas alarms mostly adopt the in-situ installation method. While this method is direct and effective, it has revealed several safety hazards and reliability issues in practical applications. Specifically, the in-situ installation method has two significant drawbacks: First, in high-risk work sites such as chemical plants, toxic and harmful gases may accumulate inside the wells. When technicians need to enter the wells for instrument calibration, maintenance, or replacement, even with protective measures, they still face a serious risk of poisoning and asphyxiation. This installation method not only increases operational risks but also significantly increases the company's safety management costs. Second, wells in open-air environments have inherent defects in their waterproof performance. Under heavy rainfall conditions, rainwater can easily seep into or flood the wells. When the water level exceeds the alarm's installation height, it can cause critical sensing components to be damaged by water immersion, resulting in monitoring system failure. Such accidents are often covert and may cause relevant units to lose important gas leak early warning capabilities under extreme weather conditions, creating significant safety hazards. Therefore, there is an urgent need to develop a safe and reliable well gas sampling device to monitor the gas situation in wells in a timely manner. Utility Model Content

[0003] Objective: In order to overcome the shortcomings of the existing technology, this utility model provides a remote well gas sampling device based on negative pressure suction, which is safe in the sampling process and easy to maintain.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] This utility model provides a remote well gas sampling device based on negative pressure suction, including a suction pipeline, a sampling pipeline, and a venturi tube; one end of the suction pipeline extends into the bottom of the well, and the other end is connected to the sampling pipeline; the sampling pipeline is connected to the throat of the venturi tube, and is used to form a negative pressure to suction the gas in the well after instrument air is introduced into the venturi tube; the negative pressure end of the venturi tube is connected to the instrument measuring cell.

[0006] This device utilizes a venturi tube to generate negative pressure to extract gas, eliminating the need for traditional mechanical pump designs. Negative pressure is created simply by introducing instrument air, enabling remote and rapid extraction of gas from wells. It is suitable for continuous or emergency monitoring. The overall device has a simple structure and is easy to maintain.

[0007] In some embodiments, a filter is also installed at one end of the suction pipeline near the bottom of the well to block impurities and allow air to pass through.

[0008] In some embodiments, the filter is a membrane filter containing a hydrophobic PE membrane.

[0009] The filter is designed to prevent impurities such as water, dust, and oil mist in the sample gas from entering the detection device, which could cause distorted results or damage to the instrument.

[0010] In some embodiments, the inlet section of the venturi tube is further connected to a pressure reducing valve for controlling the pressure of the instrument air passing through the venturi tube.

[0011] In some embodiments, the suction line and the sampling line are connected by a straight connector.

[0012] In some embodiments, the sampling pipeline includes a gas alarm for monitoring changes in gas concentration within the well and issuing an alarm signal when the gas concentration exceeds the standard.

[0013] In some embodiments, a one-way gas valve is provided between the gas alarm and the venturi tube to prevent instrument air from entering the gas alarm in case of malfunction of the venturi tube, thus affecting the monitoring results.

[0014] In some embodiments, a flow meter is provided between the gas alarm and the straight connector to regulate the flow rate of the sample gas entering the gas alarm.

[0015] In some embodiments, the flow meter is a rotor flow meter.

[0016] In some embodiments, the straight connector, sampling line, venturi tube, and pressure reducing valve are located on the ground. During maintenance, the straight connector can be disassembled to pull the suction line out of the well, thus completing the maintenance of the entire device, ensuring high safety.

[0017] Beneficial effects:

[0018] This device uses the negative pressure created by the venturi tube to draw gas from the well to the surface for measurement, enabling remote and rapid extraction of well gas. It is suitable for continuous or emergency monitoring. The filter designed at the sampling point avoids the risk of drawing impurities into the instrument, improving the accuracy of the test results and extending the equipment life. The design of the gas alarm and instrument measurement pool allows for simultaneous monitoring of sample gas concentration or component detection, which is safe and efficient. All maintenance can be performed on the ground, which is both convenient and safe. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of the remote well gas sampling device based on negative pressure suction in an embodiment of this utility model.

[0021] In the diagram: 1. Well; 2. Suction pipeline; 21. Membrane filter; 3. Sampling pipeline; 31. Gas alarm; 32. Flow meter; 4. Venturi tube; 5. Straight connector; 6. Pressure reducing valve; 7. Gas check valve. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may include different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0024] Example 1:

[0025] This embodiment provides a remote well gas sampling device based on negative pressure suction, such as... Figure 1As shown, it includes a suction line 2, a sampling line 3, a venturi tube 4, and a straight connector 5; the suction line 2 extends into the bottom of the well 1, and a membrane filter 21 is provided at one end near the bottom of the well 1; the suction line 2 and the sampling line 3 are connected through the straight connector 5; the sampling line 3 is connected to the throat of the venturi tube 4, and after instrument air is introduced into the venturi tube 4, the gas in the well 1 is sucked out using negative pressure; the negative pressure end of the venturi tube 4 is connected to the instrument measuring cell.

[0026] The inlet section of the venturi tube 4 is connected to a pressure reducing valve 6, which is used to control the pressure of the instrument air passing through the venturi tube 4.

[0027] The sampling pipeline 3 includes a gas alarm 31, which is used to monitor changes in gas concentration in the well 1 and to issue an alarm signal when the gas concentration exceeds the standard. A flow meter 32 is installed between the gas alarm 31 and the straight connector 5 to regulate the flow rate of the sample gas entering the gas alarm 31. A gas check valve 7 is installed between the gas alarm 31 and the venturi tube 4 to prevent instrument air from entering the gas alarm in case of malfunction of the venturi tube, which would affect the monitoring results.

[0028] The aforementioned sampling pipeline 3, gas alarm 31, flow meter 32, venturi tube 4, straight connector 5, and pressure reducing valve 6 are all located on the ground.

[0029] In this embodiment, the membrane filter 21 is filled with a hydrophobic PE membrane.

[0030] In this embodiment, the flow meter 32 is a rotor flow meter.

[0031] Example 2:

[0032] This embodiment, based on Embodiment 1, provides a method for using and maintaining a remote well gas sampling device based on negative pressure suction.

[0033] When using this device, connect the suction line 2 and the sampling line 3 via the straight connector 5. Connect the sampling line 3 to the throat of the venturi tube 4, and connect the pressure reducing valve 6 to the inlet section of the venturi tube 4. Introduce instrument air at a pre-adjusted pressure into the venturi tube 4 to create a negative pressure, and draw the gas from the well 1 into the instrument measuring cell for subsequent testing. The gas after testing is discharged into the atmosphere along with the instrument air. The gas alarm 31 continuously monitors the gas concentration changes in the well 1, and issues an alarm signal when the concentration of the sample gas drawn out exceeds the standard.

[0034] When the device requires maintenance, the suction line 2 is disassembled via the straight connector 5, and the membrane filter 21 and connecting pipeline located in the well 1 are pulled to the surface for maintenance. Therefore, the entire device can be maintained on the surface, reducing the risk for technicians going down into the well, making it convenient and safe.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this utility model and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0036] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0037] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 utility model based on the specific circumstances.

[0038] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A downhole gas remote sampling device based on negative pressure suction, characterized in that, It includes a suction line, a sampling line, and a venturi tube; one end of the suction line extends into the bottom of the well, and the other end is connected to the sampling line; the sampling line is connected to the throat of the venturi tube and is used to draw gas from the well using negative pressure after instrument air is introduced into the venturi tube; the negative pressure end of the venturi tube is connected to the instrument measuring cell.

2. The remote well gas sampling device based on negative pressure suction according to claim 1, characterized in that, A filter is also installed at one end of the suction pipeline near the bottom of the well to block impurities and allow air to pass through.

3. The negative pressure suction based remote gas sampling device from a well according to claim 2, characterized in that, The filter is a membrane filter containing a hydrophobic PE membrane.

4. The negative pressure suction based remote gas sampling device from a well according to claim 1, characterized in that, The inlet section of the venturi tube is also connected to a pressure reducing valve, which is used to control the pressure of the instrument air passing through the venturi tube.

5. The negative pressure suction based remote gas sampling device from a well according to claim 1, wherein, The suction line and the sampling line are connected by a straight connector.

6. The negative pressure suction based remote gas sampling device from a well according to claim 5, characterized in that, The sampling pipeline includes a gas alarm, which is used to monitor changes in gas concentration in the well and issue an alarm signal when the gas concentration exceeds the standard.

7. The remote well gas sampling device based on negative pressure suction according to claim 6, characterized in that, A one-way valve is provided between the gas alarm and the venturi tube to prevent air from entering the gas alarm in case of malfunction of the venturi tube, which would affect the monitoring results.

8. The negative pressure suction based remote gas sampling device from a well according to claim 6, characterized in that, A flow meter is installed between the gas alarm and the straight connector to regulate the flow rate of the sample gas entering the gas alarm.

9. The negative pressure suction based remote gas sampling device from a well according to claim 8, characterized in that, The flow meter is a rotor flow meter.

10. The negative pressure suction based remote gas sampling device from a well according to claim 8, characterized in that, The straight connector, sampling pipeline, venturi tube, and pressure reducing valve are located on the ground.

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