A device for collecting and analyzing trace gas in oil and gas geochemical exploration

Abstract

The application discloses an oil and gas geochemical exploration trace gas analysis and collection device, which comprises an outer cylinder, a rotating shaft, a drill bit, a soil outlet, a primary collection assembly and a secondary collection assembly. The rotating shaft is arranged in the outer cylinder in a rotating mode. A screw conveyor is fixed to the lower outer surface of the rotating shaft. The bottom of the rotating shaft is fixed with the drill bit, which is used for drilling into the soil layer to form a hole body. The screw conveyor is connected with the drill bit. The outer cylinder is provided with the soil outlet above the screw conveyor, so that the broken soil produced in the drilling process can be sent to the secondary collection assembly, thereby realizing the secondary collection of the gas in the soil. The outer cylinder is further provided with the primary collection assembly, which is used for directly collecting the gas escaping from the hole opening of the hole body.

Description

Technical Field

[0001] The present invention relates to the technical field of oil and gas geochemical exploration, in particular to an oil and gas geochemical exploration trace gas analysis and collection device. Background Art

[0002] The theoretical basis of oil and gas geochemical exploration is that hydrocarbon migration in the surrounding rocks, surface soil, and the fluids they contain produces a variety of geochemical phenomena. In order to ensure that the gas collected in the soil is not affected by the surface air, the key point to grasp is how to isolate it from the exchange with the upper gas. However, existing gas collection and analysis devices find it difficult to achieve this. In addition, they often drill directly with a drill bit and extract gas while drilling. The gas extraction process will inevitably cause blockage, resulting in low overall gas collection accuracy.

[0003] Therefore, it is necessary to provide a trace gas analysis and collection device for oil and gas geochemical exploration to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a device for analyzing and collecting trace gases for geochemical exploration of oil and gas, comprising an outer cylinder, a rotating shaft, a drill bit, a soil discharge port, a primary collection component and a secondary collection component, wherein the rotating shaft is rotatably arranged in the outer cylinder, an auger is fixed to the lower outer surface of the rotating shaft, a drill bit is fixed to the bottom of the rotating shaft for drilling into the soil layer to form a hole, the auger is connected to the drill bit, a soil discharge port is provided on one side of the outer cylinder above the auger, so that the broken soil generated during the drilling process can be sent to the secondary collection component, thereby performing secondary collection of the gas in the soil, and a primary collection component is also provided on the outside of the outer cylinder for directly collecting the gas escaping through the hole mouth of the hole.

[0005] Further, as a preference, the drill bit includes a drill bit body, a plurality of air outlet holes are opened in the drill bit body, the rotating shaft has a blind hole and is connected to the plurality of air outlet holes, an air supply seat is fixed to the top of the outer cylinder, the air supply seat is connected to the rotating shaft in a sealing and rotatable manner, the air supply seat is a cavity structure, a portion of the rotating shaft corresponding to the cavity structure is provided with a plurality of receiving holes, the receiving holes are connected to the blind holes, and the cavity structure is also supplied with air by an external air supply pipe;

[0006] The external gas supply pipe can supply carbon dioxide gas.

[0007] Furthermore, preferably, a plurality of crushing heads located on one side of the air outlet are fixed on the surface of the drill body, and the crushing heads are arranged to protrude from the drill body.

[0008] Furthermore, preferably, the surface of the drill body has a plurality of mud guide grooves, which can guide the soil spirally upward, and a collecting cylinder corresponding to the drill bit is fixed to the bottom of the outer cylinder.

[0009] Further, as a preference, the primary collection assembly includes a sealing ring, a sealing cylinder, a sealing chamber and an exhaust pipe, wherein the sealing ring sealing sleeve is arranged outside the orifice of the hole body, a sealing cylinder is fixed on the sealing ring, the sealing cylinder is sealed to the annular sealing chamber, a sealing ring gasket is provided on the inner side of the sealing chamber, and an exhaust pipe is also embedded in the sealing cylinder.

[0010] Furthermore, preferably, a sealing layer is provided between the sealing ring and the ground surface, and the sealing layer is a pre-cast airtight material.

[0011] Furthermore, preferably, a plurality of mounting grooves are provided on the sealing ring gasket, the mounting grooves are connected to the sealing chamber, an elastic sealing block is embedded in the mounting grooves, the upper outer portion of the sealing chamber is a deformable portion, the deformable portion is connected to a driving arm, and the driving arm is driven by an adjusting arm to squeeze the sealing chamber.

[0012] Furthermore, preferably, the secondary collection component includes a processing chamber, a rotor, a separation membrane and an air collecting pipe, wherein the top of the processing chamber is connected to the soil discharge port by a retractable connecting pipe, a rotor is symmetrically arranged in the processing chamber, the two ends of the separation membrane are respectively wound by the winding wheels, the middle part of the separation membrane is supported on the rotor, and an air collecting pipe is fixedly embedded in the middle part of the processing chamber, the air collecting pipe is located below the separation membrane, and the other end of the air collecting pipe is connected to the air collecting tank by a tube body.

[0013] Furthermore, preferably, the separation membrane is made of an air-permeable but water-tight material, and a scraper is provided on one side of the winding wheel for scraping off dirt on the surface of the separation membrane.

[0014] Furthermore, preferably, a plurality of oscillators for oscillating the separation membrane are fixed in the processing chamber.

[0015] Compared with the prior art, the present invention provides a trace gas analysis and collection device for oil and gas geochemical exploration, which has the following beneficial effects:

[0016] In the present invention, the primary collection component and the secondary collection component cooperate with each other to achieve isolation of external gases and effective collection of trace gases contained in the soil layer;

[0017] In the present invention, when the drive shaft rotates, the auger and the drill bit rotate accordingly, wherein the drill bit is used to break the soil and drill a hole, while the auger is used to lift the broken soil upward and discharge it from the hole, facilitating the secondary collection of gas;

[0018] In the present invention, the carbon dioxide gas supplied by the air supply pipe can, on the one hand, assist the drill bit in breaking the soil and soften the broken soil, making it easier for the auger to transport it upward. On the other hand, the carbon dioxide gas can effectively replace the gas in the soil layer, thereby assisting in the collection of trace gases. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of a trace gas analysis and collection device for oil and gas geochemical exploration;

[0020] Figure 2 This is a schematic diagram of the structure of a drill bit in a trace gas analysis and collection device for oil and gas geochemical exploration;

[0021] Figure 3 This is a schematic diagram of the structure of a secondary collection component in a trace gas analysis and collection device for oil and gas geochemical exploration;

[0022] In the figure: 1. Outer cylinder; 2. Rotating shaft; 3. Drill bit; 4. Collecting cylinder; 5. Discharge port; 6. Secondary collection assembly; 7. Sealing layer; 8. Sealing ring; 9. Sealing cylinder; 10. Sealing chamber; 11. Sealing block; 12. Sealing ring gasket; 13. Adjusting arm; 14. Driving arm; 15. Air supply seat; 16. Air supply pipe; 17. Connecting seat; 18. Shaft seat; 19. Exhaust pipe; 31. Drill bit body; 32. Air outlet; 33. Crushing head; 34. Mud guide groove; 61. Processing chamber; 62. Rotor; 63. Separation membrane; 64. Winding wheel; 65. Connecting pipe; 66. Gas collecting pipe; 67. Gas collecting tank. DETAILED DESCRIPTION

[0023] Example: See Figures 1 to 3 In an embodiment of the present invention, a device for analyzing and collecting trace gases for geochemical exploration of oil and gas includes an outer cylinder 1, a rotating shaft 2, a drill bit 3, a soil discharge port 5, a primary collection component, and a secondary collection component 6. The rotating shaft 2 is rotatably disposed in the outer cylinder 1, an auger is fixed to the lower outer surface of the rotating shaft 2, and a drill bit 3 is fixed to the bottom of the rotating shaft 2 for drilling into the soil layer to form a hole. The auger is connected to the drill bit. When the rotating shaft 2 is driven to rotate, the auger and the drill bit 3 rotate accordingly. The drill bit 3 is used to break the soil and drill a hole, and the auger is used to lift the broken soil upward to discharge the hole.

[0024] A soil discharge port 5 located above the auger is provided on one side of the outer cylinder 1 so as to send the crushed soil generated during the drilling process to the secondary collection component, thereby collecting the gas in the soil for the second time. A primary collection component is also provided on the outside of the outer cylinder 1 for directly collecting the gas escaping from the orifice of the hole body.

[0025] The effective collection of trace gases in the soil layer can be achieved through the cooperation of the primary collection component and the secondary collection component.

[0026] Furthermore, in this embodiment, the rotating shaft 2 is rotatably disposed on the shaft seat 18, and the shaft seat 18 is connected to the outer cylinder 1 through the connecting seat 17, and the feed drive for the drill bit 3 is realized through the connecting seat 17;

[0027] In this embodiment, Figure 2 The drill bit 3 includes a drill bit body 31, a plurality of air outlet holes 32 are opened in the drill bit body 31, the rotating shaft 2 has a blind hole and is connected to the plurality of air outlet holes 32, and an air supply seat 15 is fixed to the top of the outer cylinder 1. The air supply seat 15 is connected to the rotating shaft 2 in a sealed and rotatable manner. The air supply seat 15 is a cavity structure, and a plurality of receiving holes are opened in the portion of the rotating shaft 2 corresponding to the cavity structure. The receiving holes are connected to the blind holes, and the cavity structure is also supplied with air by an external air supply pipe 16;

[0028] The external gas supply pipe 16 can supply carbon dioxide gas.

[0029] On the one hand, the carbon dioxide gas it supplies can assist the drill bit 3 in breaking the soil and soften the broken soil, making it easier for the auger to transport it upward. On the other hand, the carbon dioxide gas can effectively replace the gas in the soil layer, or in other words, the carbon dioxide can carry the gas in the soil layer back along the hole, thereby assisting in the collection of trace gases. In subsequent analysis and research, it is only necessary to separate the carbon dioxide gas.

[0030] Furthermore, the primary collection assembly includes a sealing ring 8, a sealing cylinder 9, a sealing chamber 10, and an exhaust pipe 19, wherein the sealing ring 8 is sealedly sleeved outside the orifice of the orifice body, the sealing cylinder 9 is fixed on the sealing ring 8, the sealing cylinder 9 is sealedly connected to the annular sealing chamber 10, a sealing ring gasket 12 is provided on the inner side of the sealing chamber 10, and the exhaust pipe 19 is also embedded in the sealing cylinder;

[0031] The gas in the hole body can be continuously extracted through the exhaust pipe 19;

[0032] Furthermore, before drilling, carbon dioxide can be supplied to the drill bit 3 through the gas supply pipe 16 , while the gas extraction pipe 19 continuously extracts the gas, thereby replacing the gas in the sealing tube 9 .

[0033] As a preferred embodiment, a plurality of crushing heads 33 located on one side of the air outlet 32 ​​are fixed on the surface of the drill bit body 31. The crushing heads 33 are arranged to protrude from the drill bit body 31. By configuring the crushing heads 33, on the one hand, the drilling efficiency of the drill bit 3 can be improved, and on the other hand, effective protection can be provided for the air outlet 32.

[0034] As a preferred embodiment, the surface of the drill body 31 has a plurality of mud guide grooves 34 , and the mud guide grooves 34 can guide the soil spirally upward. A collecting cylinder 4 corresponding to the drill bit 3 is fixed to the bottom of the outer cylinder 1 .

[0035] As a preferred embodiment, a sealing layer 7 is further provided between the sealing ring 8 and the ground surface, and the sealing layer 7 is a pre-cast airtight material.

[0036] In this embodiment, a plurality of mounting grooves are provided on the sealing ring gasket 12, and the mounting grooves are connected to the sealing chamber. An elastic sealing block 11 is embedded in the mounting grooves. The upper outer portion of the sealing chamber 10 is a deformable portion, and the deformable portion is connected to the driving arm 14. The driving arm 14 is driven by the adjusting arm 13 to squeeze the sealing chamber 10.

[0037] During implementation, on the one hand, the sealing ring gasket 12 can effectively establish a sealed connection with the outer tube 1. On the other hand, a plurality of mounting grooves are provided on the sealing ring gasket 12, which are connected to the sealing chamber. The elastic sealing block 11 is embedded in the mounting groove. In this way, when the sealing chamber 10 is squeezed, not only can the sealing between the sealing ring gasket 12 and the outer tube 1 be improved, but the gas in the sealing chamber 1 will also squeeze the sealing block 11, making it more tightly connected to the outer tube 1.

[0038] In this embodiment, Figure 3 The secondary collection component includes a processing chamber 61, a rotor 62, a separation membrane 63 and an air collecting pipe 66, wherein the top of the processing chamber 61 is connected to the soil discharge port 5 by a retractable connecting pipe 65, and a rotor 62 is symmetrically arranged in the processing chamber 61. The two ends of the separation membrane 63 are respectively wound by the winding wheel 64, and the middle part of the separation membrane 63 is supported on the rotor 62. The middle part of the processing chamber 61 is fixedly embedded with an air collecting pipe 66, and the air collecting pipe 66 is located below the separation membrane 63. The other end of the air collecting pipe 66 is connected to the air collecting tank 67 by a tube body.

[0039] In addition, the separation membrane 63 is made of an air-permeable but water-tight material, and a scraper is provided on one side of the winding wheel 64 for scraping off dirt on the surface of the separation membrane.

[0040] In addition, a plurality of oscillators 68 for oscillating the separation membrane 63 are fixed in the processing chamber 61 .

[0041] Therefore, in practice, by configuring the collection pipe 66 to be located below the separation membrane 63, and the separation membrane 63 is made of an air-permeable but water-impermeable material, it can effectively reduce the entry of soil into the collection pipe 66 and improve the gas collection efficiency.

[0042] 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, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the scope of protection of the present invention.

Claims

1. A trace gas analysis and collection device for oil and gas geochemical exploration, characterized by: The invention comprises an outer cylinder (1), a rotating shaft (2), a drill bit (3), a soil discharge port (5), a primary collection component and a secondary collection component (6), wherein the rotating shaft (2) is rotatably arranged in the outer cylinder (1), a screw auger is fixed on the lower outer surface of the rotating shaft (2), a drill bit (3) is fixed on the bottom of the rotating shaft (2) for drilling into the soil layer to form a hole, the auger is connected to the drill bit, a soil discharge port (5) located above the auger is provided on one side of the outer cylinder (1) so as to send the crushed soil generated during the drilling process to the secondary collection component, thereby performing secondary collection of the gas in the soil, and a primary collection component is further provided on the outside of the outer cylinder (1) for directly collecting the gas escaping from the hole mouth of the hole; The secondary collection component includes a processing chamber (61), a rotating wheel (62), a separation membrane (63) and an air collecting pipe (66), wherein the top of the processing chamber (61) is connected to the soil discharge port (5) by a retractable connecting pipe (65), the processing chamber (61) is provided with a rotating wheel (62) symmetrically rotating, the two ends of the separation membrane (63) are respectively wound by a winding wheel (64), the middle part of the separation membrane (63) is supported on the rotating wheel (62), the middle part of the processing chamber (61) is fixedly embedded with an air collecting pipe (66), the air collecting pipe (66) is located below the separation membrane (63), the other end of the air collecting pipe (66) is connected to the air collecting tank (67) by a pipe body, and the processing chamber (61) is also fixed with a plurality of oscillators (68) for oscillating the separation membrane (63).

2. The device for analyzing and collecting trace gases for oil and gas geochemical exploration according to claim 1, characterized in that: The drill bit (3) comprises a drill bit body (31), a plurality of air outlet holes (32) are provided in the drill bit body (31), the rotating shaft (2) has a blind hole and is connected to the plurality of air outlet holes (32), an air supply seat (15) is fixed to the top of the outer cylinder (1), the air supply seat (15) is connected to the rotating shaft (2) in a sealed and rotatable manner, the air supply seat (15) is a cavity structure, a portion of the rotating shaft (2) corresponding to the cavity structure is provided with a plurality of receiving holes, the receiving holes are connected to the blind holes, and the cavity structure is also supplied with air by an external air supply pipe (16); The external gas supply pipe (16) is capable of supplying carbon dioxide gas.

3. The trace gas analysis and collection device for oil and gas geochemical exploration according to claim 2, characterized in that: A plurality of crushing heads (33) located on one side of the air outlet (32) are fixed on the surface of the drill body (31), and the crushing heads (33) are arranged to protrude from the drill body (31).

4. The device for analyzing and collecting trace gases for oil and gas geochemical exploration according to claim 2, characterized in that: The surface of the drill bit body (31) is provided with a plurality of mud guide grooves (34), and the mud guide grooves (34) can guide the soil upward in a spiral manner. A collecting cylinder (4) corresponding to the drill bit (3) is fixed at the bottom of the outer cylinder (1).

5. The trace gas analysis and collection device for oil and gas geochemical exploration according to claim 1, characterized in that: The primary collection assembly comprises a sealing ring (8), a sealing cylinder (9), a sealing chamber (10) and an exhaust pipe (19), wherein the sealing ring (8) is sealedly sleeved outside the orifice of the hole body, a sealing cylinder (9) is fixed on the sealing ring (8), the sealing cylinder (9) is sealedly connected to the annular sealing chamber (10), a sealing ring gasket (12) is provided on the inner side of the sealing chamber (10), and an exhaust pipe (19) is also embedded in the sealing cylinder.

6. The trace gas analysis and collection device for oil and gas geochemical exploration according to claim 5, characterized in that: A sealing layer (7) is also provided between the sealing ring (8) and the ground surface, and the sealing layer (7) is a precast airtight material.

7. The trace gas analysis and collection device for oil and gas geochemical exploration according to claim 5, characterized in that: The sealing ring gasket (12) is provided with a plurality of mounting grooves, the mounting grooves being connected to the sealing chamber, an elastic sealing block (11) being embedded in the mounting grooves, the outer upper portion of the sealing chamber (10) being a deformable portion, the deformable portion being connected to a driving arm (14), and the driving arm (14) being driven by an adjusting arm (13) to squeeze the sealing chamber (10).

8. The trace gas analysis and collection device for oil and gas geochemical exploration according to claim 1, characterized in that: The separation membrane (63) is made of an air-permeable but water-tight material, and a scraper is provided on one side of the winding wheel (64) for scraping off dirt on the surface of the separation membrane.

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