Petroleum geological exploration sampling device

Abstract

The utility model discloses petroleum geology exploration sampling device, petroleum geology exploration sampling device, including gas tank, still include the cover plate of installing at the lower extreme of gas tank, the lower extreme sealed rotary connection of cover plate has the connecting barrel, the lower extreme of connecting barrel is provided with the fixed ring, and the edge of fixed ring is provided with the sealing washer, and the inner chamber bottom surface of gas tank is installed with motor no.

Description

Technical Field

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

[0002] Petroleum geological exploration sampling equipment is used to obtain underground rock, soil, or fluid samples during petroleum geological exploration. These samples are of great significance for analyzing underground geological structures, assessing oil and gas resource potential, and formulating exploitation plans. Its main purpose is to obtain samples, collect rock, soil, or liquid samples from a specific depth below the surface, and analyze the samples to understand the underground geological structure, rock strata properties, and their oil, gas, and water content. Based on the sample analysis results, oil and gas reserves and development value are assessed.

[0003] Common petroleum geological exploration sampling devices often fail to promptly sever the gas connection between the sample chamber and the external environment after sample collection. This results in prolonged exposure of the sample to complex formation gases or drilling fluids. This delayed gas isolation can easily lead to various issues, such as sample degassing and structural damage due to pressure differences between the formation and the device, or changes in sample composition due to external gas infiltration. These issues can affect the authenticity and reliability of subsequent experimental data, especially under complex geological conditions such as high temperature and high pressure, deep wells, or unconventional oil and gas reservoirs, reducing the accuracy of obtaining and analyzing high-quality core samples.

[0004] Therefore, in view of the problem that the above-mentioned petroleum geological exploration sampling device is difficult to achieve rapid and effective isolation between the sample and the external gas during downhole operations, there is an urgent need to design a new type of petroleum geological exploration sampling device. Utility Model Content

[0005] To overcome the problem that common petroleum geological exploration sampling devices are difficult to quickly and effectively isolate samples from external gases during downhole operations.

[0006] The technical solution of this utility model is as follows: a petroleum geological exploration sampling device, including a gas box; and a cover plate installed at the lower end of the gas box. A connecting cylinder is rotatably connected to the lower end of the cover plate, and a fixing ring is provided at the lower end of the connecting cylinder. A sealing ring is provided at the edge of the fixing ring. A second motor is installed on the bottom surface of the inner cavity of the gas box. A screw is connected to the output end of the second motor. A top cover is threadedly connected to the outer side of the screw. Three sampling grippers are rotatably connected to the edge of the top cover. Each of the three sampling grippers has a sealing sleeve at its edge. The three sampling grippers together form a sealed environment. A gas delivery assembly is provided at the lower end of the cover plate. The gas delivery assembly includes a drive module and an isolation module. The isolation module is used to isolate the gas channel between the gas box and the three sampling grippers. The drive module is used to release the gas isolation effect of the isolation module. The second motor is used to drive the screw to rotate. The screw is responsible for transmitting power to move the top cover. The sealing ring of the fixing ring is used to seal the gap between the screw and the top cover. The sampling grippers are responsible for sampling.

[0007] Preferably, the gas chamber is used to contain inert gas and maintain the stability of the sample environment. The cover plate connects the gas chamber to the lower structure to achieve sealing and fixation, and supports the gas delivery assembly. Vent one is located at the bottom of the gas chamber, serving as the first channel for gas flow. The connecting cylinder carries the gear ring and the sealing disc, realizing the rotation linkage and cooperation with the gas isolation module. The fixing ring controls the opening and closing action of the sampling gripper, and the gripper is closed through the limiting action. The sealing disc is used to isolate the gas channel and prevent gas from entering the sampling gripper area in advance. Vent two is located on the sealing disc and matches vent one to achieve gas conduction. Motor one drives the active gear. The rotating wheel drives the connecting cylinder to rotate, controlling the switching of gas channels. The driving gear meshes with the gear ring to transmit power. The gear ring is fixed on the outside of the connecting cylinder and works with the driving gear to complete the rotation. The second motor drives the screw to rotate, controlling the top cover to move up and down. The screw converts the motor power into linear motion, pushing the top cover to rise and fall. The top cover connects to the sampling gripper and moves it to form a sealed space. The opening is located on the top cover and is used to connect the gas box and the gas inside the sampling gripper. The sampling gripper performs the sampling action. After merging, a sealed cavity is formed to protect the sample. The connecting rod connects the connecting cylinder and the sampling gripper, providing motion guidance and limiting support for the gripper.

[0008] Preferably, the drive module includes a motor mounted on the upper surface of the cover plate. The output end of the motor is connected to a drive gear. A gear ring is fixed on the outside of the connecting cylinder. The gear ring and the drive gear are meshed together. The motor is used to drive the connecting cylinder to rotate.

[0009] Preferably, the isolation module includes a sealing circular plate disposed inside the connecting cylinder. The surface of the sealing circular plate has a second vent, and the bottom surface of the gas box has a first vent. The first vent and the second vent have the same specifications. The connecting cylinder is used to drive the sealing circular plate to rotate. The rotation of the sealing circular plate realizes the alignment and communication between the first vent and the second vent.

[0010] Preferably, the upper surface of the top cover has three openings, which are used to connect the gas box with the internal gas channels of the three sampling grippers.

[0011] Preferably, the outer side of the connecting cylinder is connected to three connecting rods, and a sampling gripper is rotatably connected to the end of the connecting rod away from the connecting cylinder. The connecting rods provide a limiting effect for the sampling gripper.

[0012] Preferably, the opening and closing action of the sampling gripper is controlled by the fixed ring. When the sampling gripper moves upward, the fixed ring gradually applies a constraint to close the three sampling grippers.

[0013] Preferably, the gas chamber has an inflation port at the top, which is used to control the gas composition, pressure, humidity and chemical properties of the gas.

[0014] The beneficial effects of this utility model are:

[0015] 1. By setting up a gas chamber, a sealing gripper system, and a gas delivery component, the entire sample collection process is sealed and protected. The motor-driven screw moves the top cover, and the fixed ring controls the automatic opening and closing of the three sampling grippers to ensure stable and reliable sampling. The gas delivery component achieves selective conduction of the gas channel through an isolation module, ensuring the independence of the gas environment during the sampling process.

[0016] 2. After the device returns to the ground, it can be connected to an external control device through the inflation port to adjust the gas composition, pressure and humidity of the sample in the gas chamber in real time, effectively maintaining the original state of the sample and improving the accuracy of subsequent analysis. It is suitable for high-quality sampling tasks under complex geological conditions. Attached Figure Description

[0017] Figure 1 The diagram shown is a three-dimensional structural schematic of the petroleum geological exploration sampling device of this utility model.

[0018] Figure 2 The diagram shows a three-dimensional structural representation of the top cover of the petroleum geological exploration sampling device of this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the petroleum geological exploration sampling device of this utility model.

[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of the sealing circular plate in the cross-section of the petroleum geological exploration sampling device of this utility model.

[0021] Figure 5 The diagram shown is a three-dimensional structural schematic of the location of the ventilation port of the petroleum geological exploration sampling device of this utility model.

[0022] Explanation of reference numerals in the attached diagram: 1. Gas box; 2. Cover plate; 3. Vent 1; 4. Connecting cylinder; 5. Fixing ring; 6. Sealing circular plate; 7. Vent 2; 8. Motor 1; 9. Drive gear; 10. Gear ring; 11. Motor 2; 12. Screw; 13. Top cover; 14. Opening; 15. Sampling gripper; 16. Connecting rod; 17. Inflation hole. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Petroleum geological exploration is a complex and crucial process aimed at identifying and assessing underground oil and gas resources. Obtaining high-quality core samples is an essential step in accurately understanding the properties of subsurface strata and their hydrocarbon potential. Petroleum geological exploration sampling devices are specifically designed to collect these valuable samples from deep underground. This article will detail the background technology, working principles, common types, and technical challenges of such devices.

[0025] As one of the main energy sources in modern society, petroleum occupies an irreplaceable position in global economic development. With the continuous exploitation of traditional oil and gas fields, finding new oil and gas resources is becoming increasingly difficult, especially in unconventional reservoirs such as shale gas and tight oil. Therefore, improving exploration efficiency and accuracy is particularly important. And all of this hinges on obtaining representative core samples for detailed physicochemical analysis.

[0026] Early petroleum geological exploration relied primarily on rock cuttings that naturally fell during drilling as analytical materials. However, this method had significant limitations: the rock cuttings were often fragmented and could not fully reflect the original stratigraphic information. To address this problem, specialized sampling tools—core sampling devices—began to be developed.

[0027] Early core sampling devices were relatively simple, mainly involving directly cutting into the formation with a drill bit and collecting the cut core samples using a hollow tube. Development Stage: With technological advancements, dual-tube coring systems emerged, which better protected the core samples from external contamination or damage during drilling. Simultaneously, researchers developed various auxiliary devices, such as mud circulation systems, to cool the drill bit and stabilize the wellbore. Modern Technology: Today, sampling devices integrate multiple advanced technologies, including automated control systems, real-time monitoring sensors, and environmental simulation functions, significantly improving sampling accuracy and reliability.

[0028] Core samples contain a wealth of geological information, such as rock type, porosity, permeability, mineral composition, and fluid content. By analyzing this data, geologists can infer the structural characteristics, sedimentary history, and potential oil and gas reserves of the formation. Laboratory physicochemical tests (such as X-ray diffraction, scanning electron microscopy, and nuclear magnetic resonance imaging) rely on high-quality core samples. Only by ensuring the authenticity and integrity of the samples can accurate and reliable experimental results be obtained. Based on the data obtained from core analysis, engineers can develop more scientific and rational drilling plans, completion schemes, and production strategies, thereby improving the overall efficiency of oilfield development.

[0029] Single-tube coring is the most basic sampling method, consisting of a hollow drill rod with an internal cavity. As the drill bit drills downwards, the core sample moves upwards along the inside of the drill rod and eventually reaches the surface. Although simple in structure, it is susceptible to the contamination of drill cuttings, leading to a decrease in sample quality.

[0030] To overcome the shortcomings of single-tube coring systems, a dual-tube coring system was designed. This system consists of two layers of casing: an outer layer for rotary drilling and an inner layer that remains stationary, thus preventing drill cuttings from entering the core sample. Furthermore, coolant can be added to the inner casing to prevent high temperatures from damaging the core.

[0031] Closed-system coring is used in certain special geological conditions (such as high-pressure, high-sulfur formations) where conventional sampling methods are insufficient. Closed-system coring employs a sealed design, maintaining the core sample in a closed environment throughout the drilling process to prevent gas escape or liquid infiltration. These devices are typically equipped with specialized valves and pumping systems that can immediately inject inert gas or liquid into the core cavity after sampling to maintain its original state.

[0032] In recent years, with the development of information technology, intelligent coring devices have gradually emerged. These devices not only possess all the aforementioned functions but also enable remote monitoring and automatic parameter adjustment. For example, built-in sensors can monitor downhole pressure and temperature changes in real time and automatically adjust drilling speed or other operating modes based on feedback information, thereby maximizing sampling quality and safety.

[0033] Despite significant progress in existing petroleum geological exploration sampling equipment, numerous challenges remain in practical applications:

[0034] Geological conditions vary greatly across regions, making it crucial to ensure sampling devices perform well in extreme environments. For example, during deep-sea drilling or polar operations, factors such as low temperatures and high pressures can negatively impact equipment performance. Even after successfully obtaining high-quality core samples, maintaining their original characteristics during transport back to the laboratory remains a challenge. Especially during long-distance transport, temperature fluctuations and vibrations can cause sample deterioration. The high cost of developing and manufacturing advanced sampling devices limits their widespread application. Therefore, reducing production costs and improving cost-effectiveness will be a key direction for future development.

[0035] Please see Figures 1-5This utility model provides an embodiment of a petroleum geological exploration sampling device, including a gas tank 1; and a cover plate 2 installed at the lower end of the gas tank 1. A connecting cylinder 4 is rotatably connected to the lower end of the cover plate 2, and a fixing ring 5 is provided at the lower end of the connecting cylinder 4. A sealing ring is provided at the edge of the fixing ring 5. A motor 11 is installed on the bottom surface of the inner cavity of the gas tank 1. A screw 12 is connected to the output end of the motor 11. A top cover 13 is threadedly connected to the outer side of the screw 12. Three sampling grippers 15 are rotatably connected to the edge of the top cover 13. Each of the three sampling grippers 15 has a sealing sleeve at its edge, and the three sampling grippers 15 are combined to form an internal structure. In a sealed environment, a gas delivery assembly is provided at the lower end of the cover plate 2. The gas delivery assembly includes a drive module and an isolation module. The isolation module isolates the gas channel between the gas chamber 1 and the three sampling grippers 15. The drive module releases the gas isolation effect of the isolation module. Motor 11 drives the screw 12 to rotate, and the screw 12 transmits power to move the top cover 13. The sealing ring of the fixing ring 5 seals the gap between itself and the top cover 13. The sampling grippers 15 are responsible for sampling. The gas chamber 1 contains inert gas and maintains the stability of the sample environment. The cover plate 2 connects the gas chamber 1 to the structure below, achieving a sealed fixation. It supports the gas delivery assembly. Vent 1 3 is located at the bottom of the gas tank 1, serving as the first channel for gas flow. Connecting cylinder 4 carries gear ring 10 and sealing disc 6, realizing rotational linkage and cooperation with the gas isolation module. Fixed ring 5 controls the opening and closing of sampling gripper 15, achieving gripper closure through limit action. Sealing disc 6 is used to isolate the gas channel, preventing gas from prematurely entering the sampling gripper 15 area. Vent 2 7 is located on sealing disc 6, matching vent 1 3 to achieve gas conduction. Motor 1 8 drives drive gear 9 to rotate, driving connecting cylinder 4 to control gas channel switching. Drive gear 9 and gear ring 10 The gear ring 10 is fixed on the outside of the connecting cylinder 4 and works with the drive gear 9 to complete the rotation action. The motor 11 drives the screw 12 to rotate and controls the top cover 13 to move up and down. The screw 12 converts the motor power into linear motion, pushing the top cover 13 to rise and fall. The top cover 13 is connected to the sampling gripper and drives it to move, forming a sealed space. The opening 14 is located on the top cover 13 and is used to connect the gas box 1 and the gas inside the sampling gripper 15. The sampling gripper 15 performs the sampling action. After merging, a sealed cavity is formed to protect the sample. The connecting rod 16 connects the connecting cylinder 4 and the sampling gripper 15, providing motion guidance and limit support for the gripper.

[0036] This embodiment requires the use of a coring device. As part of a complete coring tool string, it is connected to the ground drilling rig via a drill rod and is lowered into the well along with the drill bit into the coring cylinder. Under the action of drilling pressure and rotation, the drill bit cuts the formation rock into a hollow cylinder. The rock core enters the coring cylinder from the middle of the drill bit, and the sampling gripper 15 begins to work.

[0037] Please see Figures 1-5 In this embodiment, the drive module includes a motor 8 mounted on the upper surface of the cover plate 2. The output end of the motor 8 is connected to a drive gear 9. A gear ring 10 is fixed to the outer side of the connecting cylinder 4. The gear ring 10 and the drive gear 9 are meshed. The motor 8 drives the connecting cylinder 4 to rotate (the motor 8 provides rotational power to control the rotation of the connecting cylinder 4; the drive gear 9 transmits the motor power to the gear ring 10, achieving mechanical transmission; the gear ring 10 meshes with the drive gear 9, converting the power of the motor 8 into the rotational motion of the connecting cylinder 4; the connecting cylinder 4 is sealed and rotated through the cover plate 2, supporting the gear ring 10 and the sealing disc 6, and driving the sealing disc 6 to rotate synchronously). The isolation module includes a sealing disc 6 disposed inside the connecting cylinder 4. A second vent 7 is opened on the surface of the sealing disc 6, and a first vent 3 is opened on the inner bottom surface of the gas box 1. The specifications of the first vent 3 and the second vent 7 are the same. The connecting cylinder 4 drives the sealing disc 6 to rotate, and the rotation of the sealing disc 6 enables the first vent 3 to rotate with the second vent 7. The alignment and interconnection of vent 2 7 (the sealing circular plate 6 acts as an isolation gas channel to prevent gas from entering the sampling gripper 15 area when not triggered; when vent 2 7 is aligned with vent 1 3 on the bottom surface of the gas box 1, gas flow is allowed; vent 1 3 is the first channel for gas to flow from the gas box 1 to the sampling gripper 15 area), the upper end face of the top cover 13 has three openings 14, which are used to connect the gas box 1 with the internal gas channels of the three sampling grippers 15 (the openings 14 are distributed on the upper end face of the top cover 13, a total of three, connecting the gas box 1 with the internal gas channels of the three sampling grippers 15, so that the gas can be evenly distributed around the sample. Regarding the sealing effect in a high-pressure environment, it should be noted that this device itself has a certain pressure resistance effect. After the sampling grippers 15 are combined, the gas box 1 is filled with inert gas, which itself has a very high pressure. After release, the internal pressure of the sampling grippers 15 is also relatively high. Although the internal pressure is not higher than the external environmental pressure, it still forms a self-pressurizing sealing effect).

[0038] Please see Figures 1-5In this embodiment, three connecting rods 16 are connected to the rotating part on the outer side of the connecting cylinder 4. A sampling gripper 15 is rotatably connected to the end of the connecting rod 16 away from the connecting cylinder 4. The connecting rods 16 provide a limiting effect for the sampling gripper 15 (the connecting rods 16 provide guidance and limiting function for the sampling gripper 15 during the up and down movement of the top cover 13, ensuring that the sampling gripper 15 opens and closes stably under the control of the fixing ring 5, preventing deviation or jamming). The opening and closing action of the sampling gripper 15 is controlled by the fixing ring 5. When the sampling gripper 15 moves upward, the fixing ring 5 gradually applies constraint to close the three sampling grippers 15 (the three sets of sampling grippers 15 are symmetrically distributed, with sealing sleeves on the edges. After merging, they form a sealed cavity to perform the clamping and sealing operation of the rock core sample. After merging, a sealed space is formed inside to prevent sample contamination). If the dye or composition changes, the fixing ring 5 applies a limiting constraint to the upward-moving sampling gripper 15. As the sampling gripper 15 rises, it is gradually guided to close, achieving automatic sealing. The sampling gripper 15 does not need to be kept open throughout the lowering process. It only needs to be open just before the core enters the sampling chamber. During non-sampling stages, when lowering or pulling out the drill bit, the sampling gripper 15 can be in a closed state to reduce the risk of friction or collision between the exposed part and the well wall. The upper end of the gas box 1 is provided with an air filling hole 17. The air filling hole 17 is used to control the gas composition, pressure, humidity and chemical properties of the gas in the gas box 1 (the air filling hole 17 is used to connect an external gas source during ground operations to adjust the gas composition, pressure, humidity and chemical properties inside the gas box 1 to ensure the original state of the sample).

[0039] During operation, when this device is lowered into the well for sampling, it is first sent to the target formation location using drilling equipment. At this time, the gas tank 1 is filled with inert gas to stabilize the environment for subsequent sample preservation. Before sampling begins, motor 8 starts, driving the drive gear 9 to rotate. Through meshing with the gear ring 10, the connecting cylinder 4 rotates synchronously. The sealing disc 6 installed inside the connecting cylinder 4 rotates accordingly, causing its vent 7 to be misaligned with the vent 3 at the bottom of the gas tank 1, thus isolating the gas passage. To prevent gas from entering the sampling area prematurely, motor 11 starts, driving screw 12 to rotate and causing the top cover 13, which is threaded to it, to move downwards. The three sampling grippers 15 connected to the edge of the top cover 13 descend accordingly and are in an open state before contacting the fixing ring 5, ready to grasp the rock core sample. As the top cover 13 continues to descend, the sampling grippers 15 gradually enter the interior of the fixing ring 5. The sealing ring set on the edge of the fixing ring 5 plays a sealing role and at the same time restrains the sampling grippers 15, causing them to automatically retract during the ascent. When the sampling is completed, the sampling gripper 15 moves upward and is limited by the fixing ring 5, forming a sealed cavity in which the sample is enclosed. Simultaneously, the connecting rod 16 connects the sampling gripper 15 to the connecting cylinder 4, providing movement guidance and limiting support to ensure smooth and reliable opening and closing of the gripper. After the sampling gripper 15 closes, the opening 14 on the upper surface of the top cover 13 communicates with the interior of the gas chamber 1. However, because the sealing disc 6 remains in an isolated state, gas has not yet flowed into the sampling gripper 15. When the device is returned to the ground... Afterwards, a gas of a specified composition, such as nitrogen or a mixed gas, can be injected into the gas chamber 1 through the inflation port 17, and parameters such as pressure and humidity can be adjusted. At this time, the motor 8 is started again to rotate the sealing disc 6, so that the vent 3 and the vent 7 are aligned. The gas enters the sealed cavity formed by the three sampling grippers 15 through the opening 14, realizing real-time control and maintenance of the environment in which the sample is located. The whole process realizes the integrated operation of sample collection, sealing protection and gas control, effectively ensuring the authenticity of the sample and the accuracy of subsequent analysis.

[0040] Through the above steps, the gas chamber 1 provides a sealed environment for the sample and maintains gas stability. The three sampling grippers 15 open and close automatically under the control of the fixing ring 5 to ensure reliable sampling sealing. The motor 2 11 drives the screw 12 to move the top cover 13, realizing the linkage control of the sampling grippers 15. The gas delivery component controls the opening and closing of the gas channel through the isolation module to ensure that the gas environment is independently controllable during the sample collection process. This solves the problem that common petroleum geological exploration sampling devices are difficult to quickly and effectively isolate the sample from the external gas during downhole operations.

Claims

1. A petroleum geological exploration sampling device, comprising a gas chamber (1); characterized in that: It also includes a cover plate (2) installed at the lower end of the gas box (1). The lower end of the cover plate (2) is rotatably connected to a connecting cylinder (4). The lower end of the connecting cylinder (4) is provided with a fixing ring (5). A sealing ring is provided at the edge of the fixing ring (5). A motor (11) is installed on the bottom surface of the inner cavity of the gas box (1). A screw (12) is connected to the output end of the motor (11). A top cover (13) is threaded on the outside of the screw (12). Three sampling grippers (15) are rotatably connected at the edge of the top cover (13). A sealing sleeve is provided at the edge of each of the three sampling grippers (15). The three sampling grippers (15) are combined to form a sealed environment. A gas delivery assembly is provided at the lower end of the cover plate (2). The gas delivery assembly includes a drive module and an isolation module. The isolation module is used to isolate the gas channel that is combined between the gas box (1) and the three sampling grippers (15). The drive module is used to release the gas isolation effect of the isolation module. Motor 2 (11) is used to drive the screw (12) to rotate. The screw (12) is responsible for transmitting power to push the top cover (13) to move. The sealing ring of the fixing ring (5) is used to seal the gap between the top cover (13) and the sampling gripper (15) is responsible for sampling.

2. The petroleum geological exploration sampling device according to claim 1, characterized in that: The drive module includes a motor (8) mounted on the upper surface of the cover plate (2). The output end of the motor (8) is connected to a drive gear (9). A gear ring (10) is fixed on the outside of the connecting cylinder (4). The gear ring (10) and the drive gear (9) are meshed. The motor (8) is used to drive the connecting cylinder (4) to rotate.

3. The petroleum geological exploration sampling device according to claim 2, characterized in that: The isolation module includes a sealing circular plate (6) set inside the connecting cylinder (4). The surface of the sealing circular plate (6) is provided with a second vent (7). The bottom surface of the gas box (1) is provided with a first vent (3). The first vent (3) and the second vent (7) have the same specifications. The connecting cylinder (4) is used to drive the sealing circular plate (6) to rotate. The rotation of the sealing circular plate (6) realizes the alignment and communication between the first vent (3) and the second vent (7).

4. The petroleum geological exploration sampling device according to claim 1, characterized in that: The top cover (13) has three openings (14) on its upper surface. The openings (14) of the top cover (13) are used to connect the gas box (1) with the internal gas channels of the three sampling grippers (15).

5. The petroleum geological exploration sampling device according to claim 3, characterized in that: The outer side of the connecting cylinder (4) is connected to three connecting rods (16). The end of the connecting rod (16) away from the connecting cylinder (4) is rotatably connected to a sampling gripper (15). The connecting rod (16) provides a limiting effect for the sampling gripper (15).

6. The petroleum geological exploration sampling device according to claim 1, characterized in that: The opening and closing action of the sampling gripper (15) is controlled by the fixed ring (5). When the sampling gripper (15) moves upward, the fixed ring (5) gradually applies constraints to close the three sampling grippers (15).

7. The petroleum geological exploration sampling device according to claim 4, characterized in that: The gas chamber (1) has an inflation port (17) at the top. The inflation port (17) is used to control the gas composition, pressure, humidity and chemical properties of the gas chamber (1).

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