A gas detection device for drilling wells used in gas field exploration

Abstract

The present invention discloses a gas detection device for drilling wells for gas field exploration, which relates to the field of gas detection technology and comprises: a protective tube, openings at both ends of which are contracted inwardly to form a mounting hole; a detection tube, which passes through the protective tube and is slidably connected to the mounting hole; a detector, which is built into the detection tube, and the detector has a plurality of detection heads, which are embedded in the outer surface of the detection tube; an annular groove, which is opened on the outer surface of the detection tube, and an air intake sleeve is fixed in the annular groove, a gap exists between the inner surface of the air intake sleeve and the groove bottom of the annular groove, and the outer surface of the air intake sleeve remains flush with the detection tube; a position adjustment component, which can at least drive the detection tube to move axially so as to adjust the relative position of the detection head according to the impact force of the detection gas, and has various detection modes to adapt to different detection environments.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a drilling well gas detection device for gas field exploration. Background Art

[0002] In the field of gas field exploration, drilling well gas detection is an extremely critical link. It can provide explorers with important information about underground gas composition, concentration, etc., and plays a decisive role in accurately assessing gas field reserves and judging the feasibility of mining.

[0003] In terms of gas detection, existing detection devices lack an effective response mechanism to gas impact forces of varying intensities. In a drilling well, the gas impact force is not constant, but rather fluctuates significantly with various factors such as drilling depth and geological conditions. When the gas impact force exceeds a certain limit, existing devices lack effective protection measures, and the detection head is easily damaged by excessive impact force, which not only increases the cost of equipment maintenance and replacement, but also seriously affects the normal progress of detection work. In terms of impurity removal, there are usually a large amount of dust and other impurities in drilling wells. Existing detection devices perform poorly in removing impurities, and most lack effective impurity removal structures, or their removal structures are unable to adjust the scraping force in real time according to actual conditions.

[0004] Therefore, it is necessary to provide a gas detection device for drilling wells used in gas field exploration to solve the above problems. Summary of the Invention

[0005] To solve the above problems, the present invention provides the following technical solution: a gas detection device for drilling wells used for gas field exploration, comprising:

[0006] The protective tube has openings at both ends that shrink inwards to form mounting holes;

[0007] a detection tube, which passes through the protective tube and is slidably connected to the mounting hole;

[0008] A detector is built into the detection tube and has a plurality of detection heads, and the detection heads are embedded in the outer surface of the detection tube;

[0009] an annular groove, which is formed on the outer surface of the detection tube, and an air intake sleeve is fixed in the annular groove, a gap is formed between the inner surface of the air intake sleeve and the bottom of the annular groove, and the outer surface of the air intake sleeve is kept flush with the detection tube;

[0010] The position adjustment component is capable of at least driving the detection tube to move axially so as to adjust the relative position of the detection head according to the impact force of the detection gas.

[0011] Preferably, when the impact force of the detection gas is greater than a threshold value, the detection head is adjusted to be hidden inside the protective tube, and the air intake sleeve is half extended out of the protective tube; when the impact force of the detection gas is less than a threshold value, the detection head is adjusted to extend out of the protective tube.

[0012] Preferably, an exhaust device is embedded in the protective tube, and the exhaust device is used to provide gas guidance for the detection head when the detection head is hidden inside the protective tube.

[0013] Preferably, when the detection head is hidden inside the protective tube, the detection head is arranged toward the exhaust device, and the projection of the detection head toward the exhaust device covers the central axis of the exhaust device.

[0014] Preferably, the exhaust device is arranged close to the end of the protective tube.

[0015] Preferably, the outer surface of the detection tube is provided with a spiral groove;

[0016] The position adjustment component includes:

[0017] a driving wheel fixed to the inner wall of the protective tube and used to drive the detection tube to rotate;

[0018] The nut seat is fixed to the inner wall of the protection tube and matched with the spiral groove of the detection tube. A through-shaped guide hole is opened on the nut seat.

[0019] Preferably, a sealing plate corresponding to the guide hole is fixed to the outer surface of the detection tube, a sealing disk corresponding to the guide hole is fixed to the sealing plate, and a pressure sensor is also embedded in the sealing plate.

[0020] Preferably, the air intake sleeve is a filter structure, and a plurality of support members are installed between the inner surface of the air intake sleeve and the bottom of the annular groove for supporting the air intake sleeve.

[0021] Preferably, a dust scraping assembly corresponding to the air inlet sleeve is further provided on the outside of the protective tube, and the dust scraping assembly includes:

[0022] a scraper seat fixed to an outer wall of one end of the protective tube, wherein a limiting plate is fixed in the scraper seat;

[0023] Two symmetrically arranged scrapers, the scrapers being limited and slidably arranged on the limit plates;

[0024] an elastic member connected between the scraper seat and the scraper plate;

[0025] Wherein, the two scrapers form a trumpet shape.

[0026] Preferably, the elastic member includes two symmetrically arranged elastic seats, a spring is connected between the two elastic seats, and an electromagnetic adjustment member is embedded in each elastic seat.

[0027] Compared with the prior art, the present invention provides a gas detection device for drilling wells used in gas field exploration, which has the following beneficial effects:

[0028] In this invention, when the gas impact force is less than a threshold, the detection head extends from the protective tube, enabling comprehensive and accurate sampling and detection by collecting gas samples from various locations and directions. When the impact force exceeds the threshold, the detection head retracts into the protective tube to prevent damage. Simultaneously, the air inlet sleeve partially extends to create a circuitous air path, allowing some gas to enter the protective tube. This allows the detection head to remain protected while still detecting gas, ensuring continuous detection under harsh airflow.

[0029] The trumpet-shaped dual-scraper structure of this invention, combined with an electromagnetically adjustable elastic element, allows for real-time adjustment of scraping force. As the intake sleeve expands and contracts, surface impurities are dynamically removed while electromagnetic force precisely controls the contact pressure between the scraper and the sleeve. This ensures efficient dust removal while preventing excessive wear, significantly extending the service life of key components and adapting to high-dust underground environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the cross-sectional structure of a gas detection device for drilling wells used in gas field exploration Figure 1 ;

[0031] Figure 2 A schematic diagram of the cross-sectional structure of a gas detection device for drilling wells used in gas field exploration Figure 2 ;

[0032] Figure 3 A schematic diagram of the cross-sectional structure of a gas detection device for drilling wells used in gas field exploration Figure 3 ;

[0033] Figure 4 Schematic diagram of the cross-sectional structure of the dust scraping assembly of the present invention;

[0034] Figure 5 is a schematic cross-sectional structural diagram of the elastic member in the present invention;

[0035] In the figure: 1. Protective tube; 2. Detection tube; 3. Detector; 4. Detection head; 5. Sealing sleeve; 6. Inlet sleeve; 7. Spiral groove; 8. Driving wheel; 9. Nut seat; 10. Guide hole; 11. Exhaust device; 12. Sealing plate; 13. Sealing disk; 14. Pressure sensor; 15. Dust scraper assembly; 151. Scraper seat; 152. Limiting plate; 153. Scraper; 154. Elastic part; 1541. Elastic seat; 1542. Electromagnetic adjustment part; 1543. Spring. DETAILED DESCRIPTION

[0036] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, and this is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0037] Example: Please refer to Figure 1-Figure 5 In an embodiment of the present invention, a gas detection device for drilling wells for gas field exploration is provided, comprising:

[0038] The protective tube 1 has openings at both ends that shrink inwards to form mounting holes;

[0039] A detection tube 2, which passes through the protective tube 1 and is slidably connected to the mounting hole;

[0040] a detector 3, which is built into the detection tube 2 and has a plurality of detection heads 4, and the detection heads 4 are embedded in the outer surface of the detection tube 2;

[0041] An annular groove is provided on the outer surface of the detection tube 2, and an air intake sleeve 6 is fixed in the annular groove. There is a gap between the inner surface of the air intake sleeve 6 and the bottom of the annular groove, and the outer surface of the air intake sleeve 6 is kept flush with the detection tube 2;

[0042] The position adjustment component is capable of at least driving the detection tube 2 to move axially so as to adjust the relative position of the detection head 4 according to the impact force of the detection gas.

[0043] A sealing sleeve 5 is further provided at one end of the detection tube 2 away from the air inlet sleeve 6 .

[0044] For example, when the impact force of the detection gas is greater than a threshold, the detection head 4 is adjusted to be hidden inside the protective tube 1, and the air intake sleeve 6 is half extended out of the protective tube 1; when the impact force of the detection gas is less than a threshold, the detection head 4 is adjusted to extend out of the protective tube 1.

[0045] like Figure 1When the impact force of the test gas falls below a threshold, the position adjustment assembly adjusts the detection head 4 to extend beyond the protective tube 1. This direct contact between the detection head 4 and the downhole gas allows for more extensive gas sampling from diverse locations and directions. Unobstructed by the protective tube 1, the detection head 4 can fully perceive changes in parameters such as gas composition and concentration in the surrounding environment, enabling more comprehensive and accurate sampling and detection, providing rich and reliable data for subsequent gas field exploration and analysis.

[0046] like Figure 2 When the impact force of the downhole gas exceeds a set threshold, the position adjustment assembly reacts quickly, driving the detection tube 2 to axially retract. The detection tube 2 moves inward along the axis of the protective tube 1, completely retracting the detection head 4 within the protective tube 1. The protective tube 1 then plays a crucial role in protecting the detection head 4, preventing damage from excessive impact and ensuring its safety.

[0047] At the same time, the air inlet sleeve 6 extends halfway out of the protective tube 1. A gap exists between the inner surface of the air inlet sleeve 6 and the bottom of the annular groove on the detection tube 2, creating a circuitous air path. This allows some gas to enter the interior of the protective tube 1, allowing the detection head 4 to remain protected while still performing gas detection, ensuring continuous gas detection even under harsh airflow conditions.

[0048] Specifically, a wind sensor may be provided on the protective tube 1 .

[0049] Furthermore, an exhaust device 11 is embedded in the protection tube 1 , and the exhaust device 11 is used to provide gas guidance for the detection head 4 when the detection head 4 is hidden inside the protection tube 1 .

[0050] The exhaust device 11 can guide the movement of the gas while discharging the gas, and guide the gas entering the protective tube 1 to the area where the detection head 4 is located in an orderly manner, so that the detection head 4 can be exposed to a relatively stable and uniform airflow, thereby continuously and accurately detecting gas parameters such as composition and concentration.

[0051] The exhaust device 11 is any one of a fan and an air pump.

[0052] In this embodiment, when the detection head 4 is hidden inside the protective tube 1 , the detection head 4 is disposed toward the exhaust device 11 , and the projection of the detection head 4 toward the exhaust device 11 covers the central axis of the exhaust device 11 .

[0053] The design of the detection head 4, which faces the exhaust device 11 and whose projection covers its central axis, ensures that the gas guided by the exhaust device 11 can fully pass through the detection head 4. As the gas passes through the detection head 4, it can fully contact all detection parts of the detection head 4, ensuring that the detection head 4 can accurately sense various gas parameters. This greatly improves the accuracy of gas detection and reduces detection errors caused by insufficient gas contact, providing a strong guarantee for safe and efficient gas field exploration.

[0054] Furthermore, the exhaust device 11 is provided close to the end of the protection tube 1 .

[0055] That is to say, the exhaust device 11 is arranged near the end of the protective tube 1, so that after the gas enters the protective tube 1, a buffer gas turbulence is formed near the end. The gas in the turbulent state contacts the detection head 4 more fully and frequently, so that the detection head 4 can more sensitively sense slight changes in gas composition and concentration.

[0056] In this embodiment, a spiral groove 7 is provided on the outer surface of the detection tube 2;

[0057] The position adjustment component includes:

[0058] a driving wheel 8 fixed to the inner wall of the protective tube 1 and used to drive the detection tube 2 to rotate;

[0059] The nut seat 9 is fixed to the inner wall of the protection tube 1 and matched with the spiral groove 7 of the detection tube 2. The nut seat 9 is provided with a through-shaped guide hole 10.

[0060] When the drive wheel 8 is activated, it causes the detection tube 2 to rotate. The spiral groove 7 on the outer surface of the detection tube 2 cooperates with the nut seat 9 fixed to the inner wall of the protective tube 1, forming a structure similar to a bolt and nut. This pushes the detection tube 2 axially and outward along the protective tube 1, allowing the detection head 4 to be fully exposed outside the protective tube 1 and directly contact the downhole gas for comprehensive sampling and detection.

[0061] When the gas impact force exceeds a threshold, drive wheel 8 rotates in the opposite direction, driving detection tube 2 to rotate in the opposite direction. The detection tube 2 moves axially and inwardly, coordinated by spiral groove 7 and nut seat 9, and detection head 4 is hidden within protective tube 1. At this time, guide hole 10 further serves its gas guidance function, guiding the gas introduced by intake sleeve 6 in an orderly manner to the area where detection head 4 is located, ensuring that the gas fully contacts detection head 4 and accurately detects gas parameters such as composition and concentration.

[0062] Furthermore, a blocking plate 12 corresponding to the guide hole 10 is fixed to the outer surface of the detection tube 2 , a blocking disk 13 corresponding to the guide hole 10 is fixed on the blocking plate 12 , and a pressure sensor 14 is also embedded in the blocking plate 12 .

[0063] like Figure 3 During extended downtime or maintenance, the detection tube 2 remains retracted, and the sealing disk 13 permanently blocks the guide hole 10. This creates a relatively independent space within the protective tube 1, completely isolating the detection head 4 from the harsh underground environment. The sealing effect of the sealing disk 13 effectively prevents harmful substances such as dust, impurities, and moisture from entering the protective tube 1 through the guide hole 10, potentially contaminating or damaging the detection head 4 and thus providing complete protection for the detection head 4.

[0064] As the sealing disk 13 approaches the guide hole 10 and attempts to seal it, its initial position may not be completely and precisely aligned with the guide hole 10. The rotation and axial movement of the detection tube 2 provide an opportunity for adjustment. The inspector or control system can fine-tune the position of the detection tube 2 based on feedback from the pressure sensor 14 by controlling the rotation direction and speed of the drive wheel 8, thereby driving the sealing disk 13 to make appropriate adjustments, gradually approaching the ideal sealing position of the guide hole 10.

[0065] In this embodiment, the air intake sleeve 6 is a filter structure, and a plurality of support members are installed between the inner surface of the air intake sleeve 6 and the bottom of the annular groove for supporting the air intake sleeve 6 .

[0066] When the gas impact force exceeds a threshold, drive wheel 8 rotates in the opposite direction, detection tube 2 retracts, and intake sleeve 6 extends partially out of protective tube 1. At this point, the filter structure of intake sleeve 6 is exposed to the downhole gas environment, where it filters the gas, removing particulate matter and some liquid droplets. The support member continuously supports intake sleeve 6, ensuring that it withstands the impact of the airflow and filters the gas without damage or deformation, and ensuring that gas can stably pass through intake sleeve 6 and enter protective tube 1.

[0067] In this embodiment, a dust scraping assembly 15 corresponding to the air inlet sleeve 6 is further provided on the outside of the protective tube 1. The dust scraping assembly 15 includes:

[0068] A scraper seat 151 is fixed to the outer wall of one end of the protective tube 1, and a limiting plate 152 is fixed in the scraper seat 151;

[0069] Two symmetrically arranged scrapers 153, the scrapers 153 are limitedly slidably arranged on the limiting plate 152;

[0070] an elastic member 154 connected between the scraper seat 151 and the scraper plate 153;

[0071] The two scrapers 153 form a trumpet shape.

[0072] The two scrapers 153 of the dust scraping assembly 15 are horn-shaped. This design increases the contact area between the scrapers 153 and the intake sleeve 6, providing better coverage of the outer surface of the intake sleeve 6. During the rotational extension and retraction of the intake sleeve 6, the scrapers effectively remove dust, impurities, and the like from the surface of the intake sleeve 6, achieving significant dust removal. Furthermore, the provision of the elastic member 154 ensures that the scrapers 153 maintain close contact with the intake sleeve 6, achieving efficient dust removal even when the surface of the intake sleeve 6 is uneven or impurities are unevenly distributed.

[0073] Furthermore, the elastic member 154 includes two symmetrically arranged elastic seats 1541 , a spring 1543 is connected between the two elastic seats 1541 , and an electromagnetic adjustment member 1542 is embedded in each elastic seat 1541 .

[0074] Through the combined design of electromagnetic adjustment member 1542 and spring 1543, elastic member 154 is able to precisely control the elastic force. Electromagnetic adjustment member 1542 can adjust the elastic force of elastic member 154 in real time based on actual operating conditions, ensuring that scraper 153 always contacts the surface of intake sleeve 6 with the appropriate force. This ensures effective dust scraping while preventing excessive wear on scraper 153 and intake sleeve 6 due to excessive elastic force, thereby extending the service life of scraper 153 and intake sleeve 6.

[0075] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A gas detection device for drilling wells used in gas field exploration, characterized in that: include: A protective tube (1), the openings at both ends of which are contracted inwards to form mounting holes; A detection tube (2), which passes through the protective tube (1) and is slidably connected to the mounting hole; A detector (3) is built into the detection tube (2), and the detector (3) has a plurality of detection heads (4), and the detection heads (4) are embedded in the outer surface of the detection tube (2); An annular groove is provided on the outer surface of the detection tube (2), and an air intake sleeve (6) is fixed in the annular groove, a gap exists between the inner surface of the air intake sleeve (6) and the bottom of the annular groove, and the outer surface of the air intake sleeve (6) is kept flush with the detection tube (2); A position adjustment component capable of at least driving the detection tube (2) to move axially so as to adjust the relative position of the detection head (4) according to the impact force of the detection gas; When the impact force of the detection gas is greater than a threshold value, the detection head (4) is adjusted to be hidden inside the protection tube (1), and the air inlet sleeve (6) is half extended out of the protection tube (1); when the impact force of the detection gas is less than the threshold value, the detection head (4) is adjusted to extend out of the protection tube (1); An exhaust device (11) is also embedded in the protective tube (1), and the exhaust device (11) is used to provide gas guidance for the detection head (4) when the detection head (4) is hidden inside the protective tube (1).

2. A gas detection device for drilling wells for gas field exploration according to claim 1, characterized in that: When the detection head (4) is hidden inside the protective tube (1), the detection head (4) is arranged toward the exhaust device (11), and the projection of the detection head (4) toward the exhaust device (11) covers the central axis of the exhaust device (11).

3. A gas detection device for drilling wells for gas field exploration according to claim 1, characterized in that: The exhaust device (11) is arranged close to the end of the protective tube (1).

4. A gas detection device for drilling wells for gas field exploration according to claim 1, characterized in that: The outer surface of the detection tube (2) is provided with a spiral groove (7); The position adjustment component includes: A driving wheel (8) fixed to the inner wall of the protective tube (1) and used to drive the detection tube (2) to rotate; A nut seat (9) is fixed to the inner wall of the protective tube (1) and is matched with the spiral groove (7) of the detection tube (2). A through-shaped guide hole (10) is provided on the nut seat (9).

5. A gas detection device for drilling wells for gas field exploration according to claim 4, characterized in that: A blocking plate (12) corresponding to the guide hole (10) is fixed on the outer surface of the detection tube (2), a blocking disc (13) corresponding to the guide hole (10) is fixed on the blocking plate (12), and a pressure sensor (14) is also embedded in the blocking plate (12).

6. A gas detection device for drilling wells for gas field exploration according to claim 1, characterized in that: The air intake sleeve (6) is a filter structure, and a plurality of support members are installed between the inner surface of the air intake sleeve (6) and the bottom of the annular groove to support the air intake sleeve (6).

7. A gas detection device for drilling wells for gas field exploration according to claim 6, characterized in that: A dust scraping assembly (15) corresponding to the air inlet sleeve (6) is further provided on the outside of the protective tube (1), and the dust scraping assembly (15) comprises: A scraper seat (151) is fixed to the outer wall of one end of the protective tube (1), and a limiting plate (152) is fixed in the scraper seat (151); Two symmetrically arranged scrapers (153), the scrapers (153) being limitedly slidably arranged on the limiting plate (152); an elastic member (154) connected between the scraper seat (151) and the scraper plate (153); The two scrapers (153) are shaped like trumpets.

8. A gas detection device for drilling wells for gas field exploration according to claim 7, characterized in that: The elastic member (154) comprises two symmetrically arranged elastic seats (1541), a spring (1543) is connected between the two elastic seats (1541), and an electromagnetic adjustment member (1542) is embedded in each elastic seat (1541).

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