Petroleum sampler suitable for petroleum geological exploration

Abstract

The utility model relates to the technical field of petroleum exploration sampling, in particular to a petroleum sampler suitable for petroleum geological exploration. The petroleum sampler suitable for petroleum geological exploration comprises a cylindrical connecting part, a cylindrical expanding part and a cylindrical sampling part which are sequentially and coaxially connected from top to bottom, a conical drill bit is coaxially arranged at the lower end of the sampling part, and a plurality of strip-shaped expanding blocks capable of moving inwards and outwards are arranged on the side face of the expanding part at intervals in the axial direction. Drilling teeth are respectively arranged on the outer surface of the expansion block, a hydraulic driving assembly for driving the expansion block to move inside and outside is arranged in the expansion part, a plurality of groups of sampling ports are formed in the sampling part at intervals up and down, and sampling assemblies which are connected with the plurality of groups of sampling ports in a one-to-one correspondence manner are respectively arranged in the sampling part. The petroleum sampling device has the advantages that the structural design is reasonable, the expansion block is hydraulically driven to move inwards and outwards to expand or contract, the operation is more stable, and meanwhile, petroleum sampling at different heights can be integrally realized.

Description

Technical Field

[0001] This utility model relates to the field of petroleum exploration sampling technology, and in particular to a petroleum sampler suitable for petroleum geological exploration. Background Technology

[0002] In the early stages of oilfield development, it is necessary to sample the oil products from the wells to obtain crucial information such as oil production, quality, and oilfield development data. The conventional approach involves inserting a drill bit into the bottom of the extraction area for extraction, then removing the drill bit and collecting and storing the extracted oil samples. However, this method is problematic because the drill pipe is compressed by the surrounding geological layers, making it difficult to remove. Furthermore, existing oil sampling equipment cannot simultaneously extract oil from multiple depths and locations; multiple samplings are required to extract oil at different depths, resulting in low sampling efficiency.

[0003] Currently, Chinese patent "CN112255046A" discloses an oil sampling device suitable for petroleum geological exploration. This sampling device can expand during drilling and sample oil at different heights during sampling. However, this device has the following drawbacks:

[0004] The expansion section is driven by a motor, and the entire drive is exposed. When the motor encounters high resistance, it is prone to jamming, which can damage the motor in severe cases. Furthermore, the exposed design makes it easy for geological debris to get in, causing parts to jam and affecting normal expansion. This could potentially lead to expansion or contraction failure during drilling.

[0005] Therefore, it is necessary to develop a new oil sampler suitable for oil geological exploration to overcome the above-mentioned technical problems. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a solution that effectively overcomes the defects of the prior art.

[0007] The technical solution of this utility model to solve the above-mentioned technical problems is as follows:

[0008] A petroleum sampler suitable for petroleum geological exploration includes a connecting part, an expansion part, and a sampling part, which are coaxially connected from top to bottom and are cylindrical in shape. The lower end of the sampling part is coaxially provided with a conical drill bit. The side of the expansion part is provided with a plurality of strip-shaped expansion blocks that can move inward and outward at intervals along the axial direction. The outer surface of the expansion blocks is provided with drill teeth. The expansion part is provided with a hydraulic drive component for driving the expansion blocks to move inward and outward. The sampling part is provided with a plurality of sampling ports at intervals from top to bottom. The sampling part is provided with sampling components that are connected to the plurality of sampling ports one by one.

[0009] Based on the above technical solution, the present invention can be further improved as follows.

[0010] Furthermore, the expansion section is hollow inside, and its sidewalls are provided with a plurality of vertically arranged slides at intervals along the circumference. The expansion blocks are slidably mounted in the slides one by one, and the hydraulic drive assembly is installed in the hollow cavity inside the expansion section.

[0011] Furthermore, the aforementioned hydraulic drive assembly includes a cylindrical piston rod and a conical drive unit. The lower end of the piston rod is coaxially connected to the conical bottom end of the drive unit. The upper part of the internal cavity of the expansion unit forms a sealed piston chamber, and the piston rod is sealed within the piston chamber. The drive unit is located in the lower part of the internal cavity of the expansion unit, and its upper end is connected and fixed to the lower end of the piston rod through a short rod that passes through the lower end of the piston chamber. The inner side of the expansion block extends into the lower part of the internal cavity of the expansion unit. The inner side of the expansion block is provided with a wedge-shaped surface that matches the conical surface of the drive unit. A wedge-shaped slider is connected to the wedge-shaped surface. Multiple grooves extending towards the conical bottom and tip of the expansion block are spaced along its circumference on the conical surface. The wedge-shaped slider is partially embedded in the grooves. The upper end of the expansion unit is detachably sealed with a cover plate. The cover plate is provided with oil ports that communicate with the cavities at both ends of the piston rod, and the oil ports are connected to hydraulic lines that pass through the connection part.

[0012] Furthermore, the aforementioned hydraulic drive assembly includes a cylindrical piston rod and a conical drive unit. The lower end of the piston rod is coaxially connected to the conical bottom end of the drive unit. The upper part of the internal cavity of the expansion unit forms a sealed piston chamber. The piston rod is sealed within the piston chamber. The drive unit is located in the lower part of the internal cavity of the expansion unit. Its upper end is connected and fixed to the lower end of the piston rod by a short rod that passes through the lower end of the piston chamber. The inner side of the expansion block extends into the lower part of the internal cavity of the expansion unit. The inner side of the expansion block is provided with a wedge-shaped surface that matches the conical surface of the drive unit. One or both sides of the wedge-shaped surface are provided with a retaining edge. A spring-loaded component is connected between the retaining edge and the inner wall of the expansion unit. The upper end of the expansion unit is detachably sealed with a cover plate. The cover plate is provided with oil ports that communicate with the cavities at both ends of the piston rod. The oil ports are connected to hydraulic lines that pass through the connection portion.

[0013] Furthermore, the drill teeth on the outer surface of the aforementioned expansion blocks are distributed in a spiral shape.

[0014] Furthermore, the sampling port is detachably equipped with a filter screen, the sampling part is hollow inside, and is equipped with the sampling components.

[0015] Furthermore, the sampling assembly includes a micro negative pressure device, a sampling tube, and a sample storage capsule. One end of the sampling tube is connected to the sampling port, and the other end is connected to the sample storage capsule. The micro negative pressure device is connected to the sample storage capsule.

[0016] Furthermore, the aforementioned miniature negative pressure device is a miniature vacuum pump.

[0017] Furthermore, the lower end of the connecting part and the upper end of the expansion part are connected by male and female threads, the lower end of the expansion part and the upper end of the sampling part are connected by male and female threads, and the lower end of the sampling part and the upper end of the drill bit are connected by male and female threads.

[0018] Furthermore, the upper end of the aforementioned expansion block is designed as a slope that slopes downwards from the inside out.

[0019] The beneficial effects of this utility model are: reasonable structural design, expansion block expands or contracts by hydraulic drive moving inward and outward, making the operation more stable and less prone to damage, ensuring the effectiveness of expansion and contraction, and enabling oil sampling at different heights as a whole. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of the petroleum sampler of this utility model, which is suitable for petroleum geological exploration.

[0021] Figure 2 This is a structural cross-sectional view of one embodiment of the petroleum sampler applicable to petroleum geological exploration according to this utility model.

[0022] Figure 3 This is a structural cross-sectional view of another embodiment of the petroleum sampler of this utility model, applicable to petroleum geological exploration.

[0023] The attached diagram lists the components represented by each number as follows:

[0024] 1. Connecting part; 2. Expanding part; 3. Sampling part; 4. Drill bit; 5. Expanding block; 22. Cover plate; 51. Drill teeth; 52. Wedge slider; 61. Piston column; 62. Drive part; 71. Miniature negative pressure device; 72. Sampling tube; 73. Sample storage bag. Detailed Implementation

[0025] The principles and features of this utility model are described below with reference to the accompanying drawings. The examples given are only for explaining this utility model and are not intended to limit the scope of this utility model.

[0026] Example: Figure 1 , 2As shown in Figure 3, the oil sampler for oil geological exploration in this embodiment includes a connecting part 1, an expansion part 2, and a sampling part 3, which are coaxially connected from top to bottom and are cylindrical in shape. The lower end of the sampling part 3 is coaxially provided with a conical drill bit 4. The side of the expansion part 2 is provided with a plurality of strip-shaped expansion blocks 5 that can move inward and outward at intervals along the axial direction. The outer surface of the expansion blocks 5 is provided with drill teeth 51. The expansion part 2 is provided with a hydraulic drive assembly for driving the expansion blocks 5 to move inward and outward. The sampling part 3 is provided with a plurality of sampling ports at intervals from top to bottom. The sampling part 3 is provided with sampling components that are connected to the plurality of sampling ports one by one.

[0027] In this embodiment, the oil sampler for petroleum geological exploration is used by connecting the upper end of the connecting part 1 to the drill pipe. The expansion blocks 5 remain in an inwardly retracted state. The drill pipe drives the entire sampler to drill. During drilling, multiple expansion blocks 5 simultaneously extend outwards via hydraulic drive, creating boreholes larger than the drill pipe diameter. After the drill bit 4 reaches a certain depth, the sampling assembly uses multiple spaced sampling ports to collect oil samples at different depths. After sampling, the expansion blocks 5 retract inwards. Because the diameter of the boreholes drilled by the expansion blocks 5 is larger than that of the drill pipe and the main body of the sampler, the drill pipe and the entire sampler can be easily removed upwards. The overall structure is reasonably designed. The expansion blocks expand or retract hydraulically, making the operation more stable and less prone to damage, ensuring the effectiveness of expansion and retraction. Furthermore, it enables oil sampling at different heights.

[0028] In a preferred embodiment, the expansion portion 2 is hollow inside, and its sidewalls are provided with a plurality of vertically arranged slides at intervals along the circumference. The expansion blocks 5 are slidably mounted in the slides in a corresponding manner, and the hydraulic drive assembly is installed in the hollow cavity inside the expansion portion 2.

[0029] In the above implementation scheme, the expansion block 5 is a strip block with a square cross-section. The corresponding slide is also designed as a square slide that matches the shape of the expansion block 5. After the expansion block 5 is installed in the slide, the two are tightly fitted together, preventing the expansion block 5 from jumping. At the same time, external substances will not enter the expansion section 2 through the slide.

[0030] In this embodiment, the structural design of the hydraulic drive assembly includes at least the following two forms:

[0031] 1) such as Figure 2As shown, the hydraulic drive assembly includes a cylindrical piston rod 61 and a conical drive section 62. The lower end of the piston rod 61 is coaxially connected to the conical bottom end of the drive section 62. The upper part of the internal cavity of the expansion section 2 forms a sealed piston chamber, in which the piston rod 61 is sealed. The drive section 62 is located in the lower part of the internal cavity of the expansion section 2, and its upper end is fixedly connected to the lower end of the piston rod 61 by a short post that passes through the lower end of the piston chamber. The inner side of the expansion block 5 extends into the expansion section 2. In the lower part of the internal cavity, the inner side of the expansion block 5 is provided with a wedge-shaped surface that is adapted to the conical surface of the drive part 62. A wedge-shaped slider 52 is connected to the wedge-shaped surface. Multiple grooves extending to the bottom and tip of the cone are provided on the conical surface of the expansion block 5 along its circumference. The wedge-shaped slider 52 is partially embedded in the groove. The upper end of the expansion part 2 is detachably sealed with a cover plate 22. The cover plate 22 is provided with oil ports that communicate with the cavities at both ends of the piston column 61 respectively. The oil ports are connected to hydraulic lines that pass through the connecting part 1.

[0032] In the above scheme 1), a piston chamber is set inside the expansion part 2, and a piston column 61 is sealed and slidably installed inside the piston chamber. An oil injection chamber is formed between the piston column 61 and the piston chamber, similar to a piston cylinder. At the same time, the inner side of the expansion block 5 is designed as a wedge-shaped surface (i.e., an inclined surface) that matches the conical drive part 62. In the initial state, the expansion block 5 retracts into the slide, and the piston column 61 and drive part 62 are in a high position. When expansion is needed, oil is injected into the oil injection chamber above the piston column 61 through the hydraulic line. The oil pushes the piston column 61 and drive part 62 to move downward. During the movement, it will drive the wedge-shaped slider 52 to move upward relative to the groove on the surface of the drive part 62. Since the drive part 62 is conical, the wedge-shaped slider 52 will move outward, thereby driving the entire expansion block 5 to expand outward. After sampling is completed, oil is injected into the oil injection chamber below the piston column 61 through the hydraulic line. The oil pushes the piston column 61 and drive part 62 to move upward, thereby driving the expansion block 5 to retract inward.

[0033] 2) such as Figure 3As shown, the hydraulic drive assembly includes a cylindrical piston rod 61 and a conical drive section 62. The lower end of the piston rod 61 is coaxially connected to the conical bottom end of the drive section 62. The upper part of the internal cavity of the expansion section 2 forms a sealed piston chamber, in which the piston rod 61 is sealed. The drive section 62 is located in the lower part of the internal cavity of the expansion section 2, and its upper end is fixedly connected to the lower end of the piston rod 61 by a short column that passes through the lower end of the piston chamber. The expansion block 5 contains... The expansion block 5 extends into the lower part of the internal cavity of the expansion section 2. The inner side of the expansion block 5 is provided with a wedge-shaped surface that is adapted to the conical surface of the drive section 62. A retaining edge (a in the figure) is provided on one or both sides of the wedge-shaped surface. A spring-loaded component is connected between the retaining edge and the inner wall of the expansion section 2. The upper end of the expansion section 2 is detachably sealed with a cover plate 22. The cover plate 22 is provided with oil ports that communicate with the cavities at both ends of the piston column 61 respectively. The oil ports are connected to hydraulic lines that pass through the connecting section 1.

[0034] The operating principle of Scheme 2) is similar to that of Scheme 1), especially in that the oil injection drives the piston rod 61 to move up and down. The difference is that the drive part 62 only moves downward to push the expansion block 5 outward. The contraction of the expansion block 5 is driven by the elastic force of the rebound component after the drive part 62 moves upward.

[0035] It should be noted that in the above schemes 1) and 2), the oil injection chamber at the upper end of the piston rod 61 is directly connected to the oil port on the cover plate 22, and the oil injection chamber at the lower end of the piston rod 61 is connected to the corresponding oil port on the cover plate 22 through the flow channel set inside the side wall of the expansion part 2 (or the oil port connected to the flow channel can be directly set on the inner wall of the expansion part 2).

[0036] In the above solution, the rebound component can be a spring.

[0037] In this embodiment, the drill teeth 51 on the outer surface of the plurality of expansion blocks 5 are arranged in a spiral shape. This facilitates the drilling and hole enlargement of the expansion blocks 5 during rotation.

[0038] In this embodiment, a filter screen is detachably provided in the sampling port, and the sampling part 3 is hollow inside and equipped with the sampling components. The filter screen can filter out most particulate impurities in the oil sample, and it is also easy to disassemble and replace.

[0039] In a preferred embodiment, the sampling assembly includes a miniature negative pressure device 71, a sampling tube 72, and a sample storage bladder 73. One end of the sampling tube 72 is connected to the sampling port, and the other end is connected to the sample storage bladder 73. The miniature negative pressure device 71 is connected to the sample storage bladder 73.

[0040] In the above implementation scheme, during sampling, the micro negative pressure device 71 is activated, creating negative pressure in the sampling tube 72 and the sample storage bladder 73, thereby drawing the oil sample through the sampling port. The micro negative pressure device 71 can be self-powered or connected to an external power source and controller via a cable extending upwards through the channel in the side wall of the expansion section 2 and the side wall of the connecting section 1, enabling external operation.

[0041] In this embodiment, the aforementioned micro negative pressure device 71 adopts a micro vacuum pump of a compatible model in the prior art.

[0042] In a preferred embodiment, the lower end of the connecting part 1 is connected to the upper end of the expansion part 2 by a male and female thread, the lower end of the expansion part 2 is connected to the upper end of the sampling part 3 by a male and female thread, and the lower end of the sampling part 3 is connected to the upper end of the drill bit 4 by a male and female thread.

[0043] In the above implementation scheme, the connecting part 1, the expansion part 2, the sampling part 3 and the drill bit 4 all adopt the conventional connection method between the drill rod and the short section (male and female threaded connection), which facilitates disassembly and assembly between them.

[0044] In this embodiment, the upper end of the expansion block 5 is designed as a downward sloping surface from the inside out. During the upward movement, if the expansion block 5 encounters a contraction or jamming, external resistance is applied to the sloping surface, which can also bind the expansion block 5 to contract inward.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and 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, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0049] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0050] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An oil sampler suitable for petroleum geological exploration, characterized in that: The device includes a connecting part (1), an expansion part (2), and a sampling part (3) that are coaxially connected from top to bottom and are cylindrical in shape. The lower end of the sampling part (3) is coaxially provided with a conical drill bit (4). The side of the expansion part (2) is provided with a plurality of strip-shaped expansion blocks (5) that can move inward and outward at intervals along the axial direction. The outer surface of the expansion blocks (5) is provided with drill teeth (51). The expansion part (2) is provided with a hydraulic drive assembly for driving the expansion blocks (5) to move inward and outward. The sampling part (3) is provided with a plurality of sampling ports at intervals from top to bottom. The sampling part (3) is provided with sampling components that are connected to the plurality of sampling ports one by one.

2. The oil sampler suitable for petroleum geological exploration according to claim 1, characterized in that: The expansion section (2) is hollow inside, and its sidewalls are provided with a plurality of vertically arranged slides at intervals along the circumference. The expansion blocks (5) are slidably mounted in the slides one by one, and the hydraulic drive assembly is installed in the cavity inside the expansion section (2).

3. The oil sampler suitable for petroleum geological exploration according to claim 2, characterized in that: The hydraulic drive assembly includes a cylindrical piston rod (61) and a conical drive section (62). The lower end of the piston rod (61) is coaxially connected to the conical bottom end of the drive section (62). The upper part of the internal cavity of the expansion section (2) forms a piston chamber. The piston rod (61) is sealed in the piston chamber. The drive section (62) extends into the lower part of the internal cavity of the expansion section (2). The expansion block (5) extends into the lower part of the internal cavity of the expansion section (2). The inner side of the expansion block (5) is configured to be aligned with... The drive unit (62) has a wedge-shaped surface that is adapted to the cone surface. A wedge-shaped slider (52) is connected to the wedge-shaped surface. The expansion block (5) has a plurality of grooves that extend to the bottom and tip of the cone at intervals along its circumference. The wedge-shaped slider (52) is partially embedded in the grooves. The upper end of the expansion unit (2) is detachably sealed with a cover plate (22). The cover plate (22) has oil ports that communicate with the cavities at both ends of the piston column (61). The oil ports are connected to hydraulic lines that pass through the connecting part (1).

4. The oil sampler suitable for oil geological exploration according to claim 2, characterized in that: The hydraulic drive assembly includes a cylindrical piston rod (61) and a conical drive section (62). The lower end of the piston rod (61) is coaxially connected to the conical bottom end of the drive section (62). The upper part of the internal cavity of the expansion section (2) forms a piston chamber. The piston rod (61) is sealed in the piston chamber. The drive section (62) extends into the lower part of the internal cavity of the expansion section (2). The expansion block (5) extends into the lower part of the internal cavity of the expansion section (2). The inner side of the expansion block (5) is provided with a wedge-shaped surface that is adapted to the conical surface of the drive part (62). A retaining edge is provided on one or both sides of the wedge-shaped surface. A spring-loaded component is connected between the retaining edge and the inner wall of the expansion part (2). The upper end of the expansion part (2) is detachably sealed with a cover plate (22). The cover plate (22) is provided with an oil port that communicates with the cavities at both ends of the piston column (61). The oil port is connected to a hydraulic pipeline that passes through the connecting part (1).

5. The oil sampler suitable for petroleum geological exploration according to claim 1, characterized in that: The drill teeth (51) on the outer surface of the multiple expansion blocks (5) are distributed in a spiral shape.

6. The oil sampler suitable for petroleum geological exploration according to claim 1, characterized in that: The sampling port is detachably equipped with a filter screen, and the sampling part (3) is hollow inside and is equipped with the sampling component.

7. A petroleum sampler suitable for petroleum geological exploration according to claim 6, characterized in that: The sampling assembly includes a micro negative pressure device (71), a sampling tube (72), and a sample storage capsule (73). One end of the sampling tube (72) is connected to the sampling port, and the other end is connected to the sample storage capsule (73). The micro negative pressure device (71) is connected to the sample storage capsule (73).

8. A petroleum sampler suitable for petroleum geological exploration according to claim 7, characterized in that: The micro negative pressure device (71) is a micro vacuum pump.

9. A petroleum sampler suitable for petroleum geological exploration according to claim 1, characterized in that: The lower end of the connecting part (1) is connected to the upper end of the expansion part (2) by a male and female thread. The lower end of the expansion part (2) is connected to the upper end of the sampling part (3) by a male and female thread. The lower end of the sampling part (3) is connected to the upper end of the drill bit (4) by a male and female thread.

10. A petroleum sampler suitable for petroleum geological exploration according to any one of claims 1 to 9, characterized in that: The upper end of the expansion block (5) is set as an inclined surface that slopes downward from the inside out.

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