Underground geophysical prospecting centralizer

Abstract

The utility model discloses a centralizer for underground geophysical exploration, which relates to the technical field of underground exploration and comprises two end guide rings, and external expansion covers are fixed at the ends, close to each other, of the end guide rings. The outer diameter of the portion, located at the outer expansion cover, of the device is smaller than the inner diameter of a well, the device can smoothly go deep into the oil well, when the device advances, an air pump works alternately to inflate and deflate an air bag, when the device is inflated, the device can jack a roller frame, and after the roller frame is jacked, the roller frame protrudes outwards through rotation of a rotating frame and the outer expansion cover; when the air bag is deflated, the overall outer diameter of the air bag is reduced, the probe can continue to go deep into the well, and the probe can go deep into the well by a deeper distance in a manner of expanding and reducing the outer diameter during the intermittent operation, so that the probe can go deep into the well for a deeper distance, and the probe can go deep into the well for a deeper distance. And meanwhile, the problem of being stuck at the concave-convex part of the well wall is also avoided.

Description

Technical Field

[0001] The utility model relates to the technical field, in particular to a downhole geophysical exploration centralizer. Background Art

[0002] The purpose of oil well well exploration with probes and the use requirements of centralizers can be explained from the following aspects:

[0003] The purpose of oil well shaft exploration with probe:

[0004] Resource exploration: The main purpose of oil well exploration is to find out the key information such as the distribution, reserves, quality and mobility of underground oil and natural gas. By drilling underground rocks and obtaining geological samples, the potential and exploitability of oil and gas resources can be accurately evaluated.

[0005] Geological analysis: Probe exploration can also help geologists understand the structure, construction and lithology of underground rock formations, providing important geological basis for subsequent oil and gas field development and production;

[0006] Engineering guidance: During the drilling process, the data collected by the probe can be used to guide the design and implementation of the drilling project, ensuring the safety and efficiency of the drilling operation;

[0007] Function of the centralizer: The centralizer is mainly used to maintain the verticality and straightness of the wellhead during the drilling process, reduce drilling deviation, improve drilling efficiency and safety, and it can also reduce the friction between the drill bit and the well wall and reduce drill bit wear.

[0008] In the process of implementing this solution, the inventors found that the following problems in the prior art have not been well solved: the outer diameter of the traditional stabilizer has a certain convex shape, the purpose of which is to achieve a wear-resistant effect, but the oil well shafts are not all flat, and some shaft walls are uneven. When the probe is installed in the centralizer and penetrated into the shaft, its convex part can easily get stuck in the depression of the well wall, and the concave part of the centralizer can also easily get stuck in the convex part of the well wall. In the best case, the angle of the centralizer needs to be readjusted, and in the worst case, it is impossible to continue to go deeper, which seriously affects the exploration use of the probe. Utility Model Content

[0009] The main purpose of the utility model is to provide a downhole geophysical exploration centralizer, which can effectively solve the problems in the background technology.

[0010] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0011] An underground geophysical logging tool, including end guide rings. The number of the end guide rings is two. An outer expansion cover is fixed at one end of each of the end guide rings close to each other. An inner expansion cover is fixed at one end of each of the outer expansion covers close to each other. A baffle is fixed at one end of each of the inner expansion covers close to each other. An airbag is arranged between the baffles. A wire is inserted through the airbag. Fixing pipes are arranged on the outer walls at both ends of the wire at the end lining. A probe is arranged at one end of the wire passing through one of the fixing pipes. The fixing pipes are respectively in through communication with the inside of the inner expansion cover and the baffle. An air pump is installed inside each of the inner expansion covers. A pipe is connected to the end of each air pump. Air nozzles are arranged at both ends of the airbag. A plurality of rotating frames are rotatably connected to one side of each of the outer expansion covers close to each other. A roller frame is arranged between every two parallel rotating frames.

[0012] Preferably, the fixing pipes are respectively inserted into the inside of two end linings.

[0013] Preferably, both ends of the roller frame are respectively inserted into two rotating frames at matching positions and rotatably connected thereto.

[0014] Preferably, telescopic rods are arranged on one side of each of the two outer expansion covers close to each other, and the telescopic rods are respectively located between two adjacent roller frames.

[0015] Preferably, a rubber lining is arranged at the position of the outer expansion cover between the inner expansion cover, the baffle, the airbag and a plurality of roller frames.

[0016] Preferably, one of the air pumps is an inflation pump and the other air pump is an air extraction pump. The pipes are respectively in through communication with the inner expansion cover and the baffle, and one end of the pipes passing through the baffle is respectively connected to air nozzles at matching positions. A plurality of air holes are drilled in the outer expansion cover.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The outer diameter of the device at the outer expansion cover is smaller than the inner diameter of the wellbore, and it can smoothly penetrate into the oil well. When it moves forward, the air pumps work alternately to inflate and deflate the airbag. When it is inflated, it will push the roller frame. After being pushed, the roller frame will protrude outward through the rotation of the rotating frame and the outer expansion cover. The outer diameter formed after its protrusion is larger than the outer diameter of the outer expansion cover, so as to contact the well wall and roll during downward sliding. When the airbag deflates, the overall outer diameter shrinks, and it can continue to penetrate into the wellbore. This way of intermittently expanding and shrinking the outer diameter for straightening enables the probe to penetrate deeper into the underground, and at the same time avoids the problem of getting stuck at the uneven parts of the well wall. Description of the Drawings

[0019] Figure 1Schematic diagram of a downhole geophysical prospecting centralizer of the present utility model in its normal state;

[0020] Figure 2 Schematic diagram of a downhole geophysical prospecting centralizer of the present utility model in its expanded state;

[0021] Figure 3 Schematic diagram of the structure of the end guide ring and the expanded cover of a downhole geophysical prospecting centralizer of the present utility model after sectioning;

[0022] Figure 4 Schematic diagram of the structure of the inner expansion cover, baffle, and airbag of a downhole geophysical prospecting centralizer of the present utility model after sectioning;

[0023] Figure 5 Schematic diagram of the enlarged structure at position A of a downhole geophysical prospecting centralizer of the present utility model.

[0024] In the figure: 1. End guide ring; 11. End inner lining; 2. Expanded cover; 21. Inner expansion cover; 22. Baffle; 23. Air hole; 3. Conducting wire; 31. Probe; 32. Fixed pipe; 4. Air pump; 41. Pipeline; 5. Airbag; 51. Air nozzle; 6. Rubber inner lining; 7. Telescopic rod; 8. Rotating frame; 9. Roller frame. Detailed implementation manners

[0025] To make the technical means, creative features, achieved purposes, and functions of the present utility model easy to understand, the present utility model will be further described below in conjunction with specific implementation manners.

[0026] As Figures 1-5 shown, a downhole geophysical prospecting centralizer includes an end guide ring 1. The number of end guide rings 1 is two. Outer expansion covers 2 are fixed at the ends of the end guide rings 1 that are close to each other. Inner expansion covers 21 are fixed at the ends of the outer expansion covers 2 that are close to each other. Baffles 22 are fixed at the ends of the inner expansion covers 21 that are close to each other. An airbag 5 is arranged between the baffles 22. A conducting wire 3 is inserted through the airbag 5. Fixed pipes 32 are arranged on the outer walls of both ends of the conducting wire 3 at the end inner lining 11. A probe 31 is arranged at one end of the conducting wire 3 passing through one of the fixed pipes 32. The fixed pipes 32 are respectively in through communication with the interiors of the inner expansion covers 21 and the baffles 22. Air pumps 4 are installed inside the inner expansion covers 21. Pipelines 41 are connected to the ends of the air pumps 4. Air nozzles 51 are arranged at both ends of the airbag 5. A plurality of rotating frames 8 are rotatably connected to the sides of the outer expansion covers 2 that are close to each other. Roller frames 9 are arranged between two parallel rotating frames 8.

[0027] Specifically, the fixed pipes 32 are respectively inserted into the interiors of the two end inner linings 11.

[0028] Specifically, both ends of the roller frame 9 are respectively inserted into two rotating frames 8 at matching positions and are rotatably connected thereto, enabling it to expand outward through the airbag 5.

[0029] Specifically, telescopic rods 7 are provided on one side of the two outer expansion covers 2 close to each other, and the telescopic rods 7 are respectively located between two adjacent roller frames 9. The position of the wire 3 between the fixed pipes 32 and the roller frames 9 where the telescopic rods 7 can match their outer expansion and inner retraction through telescoping.

[0030] Specifically, a rubber inner lining 6 is provided at the position of the outer expansion cover 2 between the inner expansion cover 21, the baffle 22, the airbag 5 and several roller frames 9. The rubber inner lining 6 plays a role in protecting the airbag 5 to prevent the rough wellbore from wearing the airbag 5.

[0031] Specifically, one of the air pumps 4 is an inflation pump, and the other air pump 4 is an air extraction pump. The pipelines 41 are respectively communicated through the inner expansion cover 21 and the baffle 22, and one end thereof passing through the baffle 22 is respectively connected to the air nozzles 51 with matching positions. A number of air holes 23 are drilled on the outer expansion cover 2, so that the airbag 5 can be inflated and deflated, enabling the roller frame 9 to expand or contract its outer diameter. When it expands, it can support against the wellbore, enabling the probe 31 to detect the situation inside the wellbore. When it contracts, it can continue to penetrate deeper into the wellbore.

[0032] Working principle:

[0033] The outer diameter of the device at the outer expansion cover 2 is smaller than the inner diameter of the wellbore, and it can smoothly penetrate into the oil well. When it travels, the air pumps 4 work alternately to inflate and deflate the airbag 5. When it is inflated, it will push the roller frame 9. After being pushed, the roller frame 9 will protrude outward through the rotation of the rotating frame 8 and the outer expansion cover 2. The outer diameter size formed after its outward protrusion will be larger than the outer diameter size of the outer expansion cover 2, so as to contact the well wall and roll during downward sliding. When the airbag 5 deflates, the overall outer diameter shrinks, and it can continue to penetrate deeper into the wellbore. This way of intermittently expanding and shrinking the outer diameter for straightening enables the probe 31 to penetrate deeper into the well, and at the same time avoids the problem of getting stuck at the uneven parts of the well wall.

[0034] The circuits, electronic components and control modules involved are all prior arts, which can be fully realized by those skilled in the art without further elaboration. The content protected by the present utility model does not involve improvements to software and methods either.

[0035] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A downhole geophysical logging centralizer, comprising an end guide ring (1), characterized in that: The number of the end guide rings (1) is two. An outer expansion cover (2) is fixed to each end of the end guide rings (1) that are close to each other. An inner expansion cover (21) is fixed to each end of the outer expansion cover (2) that are close to each other. A baffle (22) is fixed to each end of the inner expansion cover (21) that are close to each other. An airbag (5) is arranged between the baffles (22). A wire (3) is inserted through the airbag (5) in a penetrating manner. Fixing tubes (32) are arranged on the outer walls of both ends of the wire (3) at the position of the end inner lining (11). A probe (31) is arranged at one end of the wire (3) passing through one of the fixing tubes (32). The fixing tubes (32) are respectively in penetrating communication with the interiors of the inner expansion cover (21) and the baffle (22). An air pump (4) is installed in each of the inner expansion covers (21). A pipe (41) is connected to the end of each air pump (4). Air nozzles (51) are arranged at both ends of the airbag (5). A plurality of rotating frames (8) are rotatably connected to one side of the outer expansion covers (2) that are close to each other. A roller frame (9) is arranged between two parallel rotating frames (8).

2. The downhole geophysical logging centralizer according to claim 1, characterized in that: The fixing tubes (32) are respectively inserted into the interiors of the two end inner linings (11).

3. The downhole geophysical logging centralizer according to claim 1, wherein: Both ends of the roller frame (9) are respectively inserted into two rotating frames (8) at matching positions and are rotatably connected thereto.

4. The downhole geophysical logging centralizer according to claim 1, wherein: An expansion rod (7) is arranged on one side of the two outer expansion covers (2) that are close to each other, and the expansion rods (7) are respectively located between two adjacent roller frames (9).

5. The downhole geophysical logging centralizer according to claim 1, characterized in that: A rubber inner lining (6) is arranged at the position of the outer expansion cover (2) between the inner expansion cover (21), the baffle (22), the airbag (5) and a plurality of roller frames (9).

6. The downhole geophysical logging centralizer according to claim 1, wherein: One of the air pumps (4) is an inflation pump, and the other air pump (4) is an air extraction pump. The pipes (41) are respectively in penetrating communication with the inner expansion cover (21) and the baffle (22), and one end of the pipes (41) passing through the baffle (22) is respectively connected to the air nozzles (51) at matching positions. A plurality of air holes (23) are drilled in the outer expansion cover (2).

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