Oil sampling device with filtering structure for tight oil geological exploration

Abstract

The utility model discloses an oil sampling device with a filtering structure for tight oil geological exploration, which relates to the technical field of tight oil geological exploration and comprises a drilling head formed by connecting a drilling part and a drilling shell, and a sampling cavity and a plurality of filtering plates are arranged between the drilling part and the drilling shell. The bottom end of the drilling shell is provided with a notch, a stable supporting plate and a ground grabbing assembly. According to the petroleum sampling device with the filtering structure for tight oil geological exploration, the drilling head is designed into a fixed combined structure of the drilling part and the drilling shell, so that the drilling head is more stable when being connected to a drilling machine compared with two separated half-plate structures, and a plurality of filtering plates are vertically arranged in the sampling cavity; according to the device, the space can be effectively utilized to realize layer-by-layer filtration, so that the sufficient filtration effect is ensured, meanwhile, through the cooperation of the stable supporting plate and the ground gripping assembly, the stable supporting plate is clamped into cracks generated around during drilling, the firm ground gripping effect is realized, and then the stability during pumping and sampling is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of tight oil geological exploration, specifically to an oil sampling device with a filter structure for tight oil geological exploration. Background Technology

[0002] Tight oil refers to oil accumulations formed in tight reservoirs sandwiched or adjacent to high-quality source rock formations without undergoing large-scale, long-distance migration. It is a large-area, continuously distributed oil resource that coexists with or is adjacent to source rock formations. It is very common and has large reserves. Currently, in the process of exploring tight oil, it is necessary to first drill holes in the rock and then carry out tight oil sampling operations.

[0003] However, removing the drilling equipment after drilling and then sampling complicates the process. Furthermore, the drilled hole may collapse during removal, affecting oil sample collection. To overcome these shortcomings, existing technology (Chinese patent application number 202221187067.7, application date 2022-05-17) describes an oil sampling device for tight oil geological exploration. This invention arranges the oil sampling component based on the drilling component. After drilling using a fixed and a spread-out half-plate, a synchronous control rod creates a gap between the spread-out and fixed half-plates. Oil then passes through a filter plate into the half-plate, allowing sampling via a further extraction tube. However, this structure consists of two separate half-plates, which are unstable when connected to the drilling mechanism. Additionally, the filter structure is simple due to space constraints, resulting in mediocre filtration.

[0004] To address the aforementioned issues, there is an urgent need for innovative design based on existing equipment. Therefore, we have proposed a petroleum sampling device with a filtration structure for tight oil geological exploration, which can effectively solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a petroleum sampling device for tight oil geological exploration with a filter structure, so as to solve the problems mentioned in the background art, that the structure is composed of two separated half plates, such a structure is relatively unstable when connected to the drilling mechanism, and the filter structure is relatively simple due to space limitations and has a general filtering effect.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a petroleum sampling device for tight oil geological exploration with a filtering structure, comprising a drill bit consisting of a drilled part and a drilled shell connected together; the drilled shell is located outside the drilled part, and the bottom end of the drilled part is formed into a pointed cone structure, and the bottom end of the drilled shell narrows and fits tightly against the pointed cone outer wall of the drilled part; a sampling chamber is formed between the drilled part and the drilled shell, and the bottom end of the sampling chamber is connected to the outside, and the top of one side of the sampling chamber is connected to an external suction machine through a connecting pipe; multiple filter plates are also installed inside the sampling chamber in a vertically uniform distribution; multiple notches are opened at the bottom end of the drilled shell in a uniformly circumferential distribution, and a stable support plate is movably set inside the notch through a ground gripping component.

[0007] Preferably, the diameter of the pores in the filter plate decreases from bottom to top to achieve the effect of filtering layer by layer from bottom to top when sampling upwards.

[0008] Preferably, the gripping component includes a hollow groove formed in the middle of the inner side of the drilled part, and a lifting rod sliding on the inner side of the hollow groove. The bottom end of the drilled part is provided with a plurality of movable grooves, and a movable plate is vertically limited and slidably provided on the inner side of the movable grooves. The outer side of the movable plate is rotatably connected to the stabilizing support plate, and the bottom end of the lifting rod is pressed against the top of all the movable plates.

[0009] Preferably, the inner wall of the hollow groove is formed with a ring of protrusions, and a first spring is fixedly connected between the outer wall of the lifting rod and the protrusions, and a second spring is fixedly connected between the moving plate and the inner wall of the drilled part.

[0010] Preferably, the top of the cone of the drilled part is formed with a plurality of guide protrusions, and the guide protrusions are designed with downwardly expanding slopes, and the guide protrusions are correspondingly attached to one side of each stabilizing support plate to provide a guiding function when the stabilizing support plate is pushed down.

[0011] Preferably, the drill bit is detachably installed on the drilling machine via a mounting component, the top of the outer wall of the drill housing is formed with a threaded protrusion, and the bottom inner wall of the mounting component is provided with a matching threaded groove.

[0012] Preferably, a hydraulic rod is fixedly installed on the bottom of the inner wall of the mounting component, and the bottom end of the hydraulic rod protrudes from the bottom of the mounting component and can slide inside the hollow groove.

[0013] Compared with the prior art, the beneficial effects of this utility model are: This kind of oil sampling device for tight oil geological exploration with a filter structure, by designing the drill head as a fixed combination structure of the drill part and the drill shell, is more stable than two separate half-plate structures connected to the drilling machine. Moreover, through the multiple filter plates arranged vertically in the sampling chamber, the space can be effectively utilized to achieve layer-by-layer filtration, thereby ensuring sufficient filtration effect. At the same time, through the cooperation of the stabilizing support plate and the ground gripping component, the stabilizing support plate is inserted into the cracks generated around the drill hole to achieve a firm ground gripping effect, thereby improving the stability of sampling. The specific contents are as follows: (1) By designing the drill head as a fixed combination structure of the drill part and the drill shell, it is more stable than two separate half-plate structures connected to the drilling machine. Moreover, through the multiple filter plates arranged vertically in the sampling chamber, the space can be effectively utilized to achieve layer-by-layer filtration, thereby ensuring sufficient filtration effect.

[0014] (1) By using the notch, the stabilizing support plate and the gripping component together, the lifting rod moves down along the hollow groove. The lifting rod continues to drive all the moving plates to move down along the moving groove. In this way, the stabilizing support plate will move down synchronously and expand outward through the notch to the outside of the drill bit, so as to get stuck in the cracks generated around the drill hole, thereby achieving a firm gripping effect and improving the stability of sampling.

[0015] (2) By setting a first spring between the hollow groove and the lifting rod, and setting a second spring on the moving plate, the rebound effect of the two sets of springs can drive the lifting rod and each moving plate to move upward automatically and reset, so as to facilitate the next gripping operation.

[0016] (3) By setting the mounting parts, the drill bit can be detachably installed on the drilling machine, and by setting the hydraulic rod inside the mounting parts, the bottom rod extends downward along the hollow groove to push the lifting rod downward, so as to realize the rapid operation of the gripping component. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the overall cross-sectional structure of this utility model;

[0019] Figure 3 This utility model Figure 2 Enlarged structural diagram at point A in the middle;

[0020] Figure 4 This is a partial cross-sectional structural diagram of the present invention;

[0021] Figure 5 This is a schematic diagram of the connection structure between the stable support plate and the movable plate of this utility model;

[0022] Figure 6 This is a schematic diagram of the installation component and hydraulic rod of this utility model.

[0023] In the diagram: 1. Drill head; 2. Drilling section; 3. Drilling shell; 4. Sampling chamber; 5. Connecting pipe; 6. Filter plate; 7. Notch; 8. Stabilizing support plate; 9. Hollow groove; 10. Lifting rod; 11. First spring; 12. Moving groove; 13. Moving plate; 14. Second spring; 15. Guide protrusion; 16. Mounting component; 17. Hydraulic rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Example 1: Please refer to Figures 1-6 The present invention provides the following technical solution: a petroleum sampling device for tight oil geological exploration with a filter structure, comprising a drill bit 1 consisting of a drilled part 2 and a drilled outer shell 3 connected together; the drilled outer shell 3 is located outside the drilled part 2, and the bottom end of the drilled part 2 is formed into a pointed cone structure, and the bottom end of the drilled outer shell 3 is narrowed and tightly fitted to the pointed cone outer wall of the drilled part 2; a sampling chamber 4 is formed between the drilled part 2 and the drilled outer shell 3, and the bottom end of the sampling chamber 4 is connected to the outside; and the top of one side of the sampling chamber 4 is connected to an external suction machine through a connecting pipe 5; and multiple filter plates 6 are installed inside the sampling chamber 4 in a vertically uniform distribution, and the diameter of the leakage holes of the filter plates 6 decreases from bottom to top.

[0026] When the device is in use, the drill head 1 is inserted into the rock by a drilling machine to drill a hole. After reaching the predetermined depth, the suction machine connected to the connecting pipe 5 is started to suction the oil. In this way, the dense oil can enter the space between the drilling part 2 and the drilling shell 3 through the sampling chamber 4, and flow upward through each filter plate 6 for layer-by-layer filtration. Finally, it enters the corresponding collection container through the connecting pipe 5, thus realizing the sampling operation. Since the drill head 1 is a fixed combination of the drilling part 2 and the drilling shell 3, it is more stable than two separate half-plate structures connected to the drilling machine. Moreover, the multiple filter plates 6 arranged vertically in the sampling chamber 4 can effectively utilize space to achieve layer-by-layer filtration, thereby ensuring a sufficient filtration effect.

[0027] Example 2: Based on Example 1, the bottom end of the drill housing 3 has multiple notches 7 evenly distributed in a circular pattern. A stable support plate 8 is movably installed inside the notches 7 via a ground-gripping assembly. The ground-gripping assembly includes a hollow groove 9 located in the middle of the inner side of the drill section 2, and a lifting rod 10 slides along the inner side of the hollow groove 9. The bottom end of the drill section 2 has several moving grooves 12, and a moving plate 13 is vertically limited and slidably mounted on the inner side of each moving groove 12. The outer side of the moving plate 13 is rotatably connected to the stable support plate 8. The bottom end of the lifting rod 10 presses against the top of all the moving plates 13. When the drill bit 1 drills into the rock, the lifting rod 10 moves along the hollow groove 9... As the groove 9 moves downward, the lifting rod 10 continues to drive all the moving plates 13 to move downward along the moving groove 12, so that the stabilizing support plate 8 will move downward synchronously. The top of the cone of the drilling part 2 is formed with several guide protrusions 15, and the guide protrusions 15 are designed with downward and outward expansion. The guide protrusions 15 are correspondingly attached to one side of each stabilizing support plate 8. Through the setting of the guide protrusions 15, a guiding effect can be provided when the stabilizing support plate 8 is pushed downward, so that it automatically expands outward to the outside of the drill head 1 to get into the cracks around the cone when the drilling part 2 drills, so as to achieve a firm gripping effect and thus improve the stability during sampling.

[0028] In addition, the inner wall of the hollow groove 9 is formed with a ring of protrusions, and a first spring 11 is fixedly connected between the outer wall of the lifting rod 10 and the protrusions. A second spring 14 is fixedly connected between the moving plate 13 and the inner wall of the drilled part 2. Through the rebound action of the first spring 11 and the second spring 14, the lifting rod 10 and each moving plate 13 can be driven to move upward and reset automatically, so as to facilitate the next gripping operation.

[0029] Example 3: Based on Example 2, the drill bit 1 is detachably installed with the drilling machine through the mounting part 16. The top of the outer wall of the drill housing 3 is formed with a threaded protrusion, and the bottom inner wall of the mounting part 16 is provided with a matching threaded groove, so as to realize convenient threaded installation of the drill bit 1 and the mounting part 16.

[0030] Furthermore, a hydraulic rod 17 is fixedly installed on the bottom of the inner wall of the mounting component 16, and the bottom end of the hydraulic rod 17 protrudes from the bottom of the mounting component 16 and can slide inside the hollow groove 9. By extending the hydraulic rod 17 downward along the hollow groove 9, the lifting rod 10 is pushed downward, thereby realizing the rapid operation of the gripping component.

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A petroleum sampling device for tight oil geological exploration with a filter structure, comprising a drill bit (1) consisting of a drill section (2) and a drill shell (3) connected together; Its features are: The drilling shell (3) is located outside the drilling part (2), and the bottom end of the drilling part (2) is formed into a pointed cone structure. The bottom end of the drilling shell (3) is narrowed and tightly attached to the pointed cone outer wall of the drilling part (2). A sampling cavity (4) is formed between the drilling part (2) and the drilling shell (3). The top of one side of the sampling cavity (4) is connected to an external suction machine through a connecting pipe (5). Multiple filter plates (6) are also installed inside the sampling cavity (4). The bottom end of the drilled housing (3) is provided with a plurality of notches (7) evenly distributed in a circular pattern, and a stable support plate (8) is movably installed inside the notch (7) through a ground gripping component.

2. The oil sampling device with a filter structure for tight oil geological exploration according to claim 1, characterized in that: The diameter of the pores in the filter plate (6) decreases from bottom to top to achieve the effect of filtering layer by layer from bottom to top when sampling upwards.

3. The oil sampling device with a filter structure for tight oil geological exploration according to claim 2, characterized in that: The gripping component includes a hollow groove (9) opened in the middle of the inner side of the drilled part (2), and a lifting rod (10) slides on the inner side of the hollow groove (9). Several moving grooves (12) are opened at the bottom end of the drilled part (2), and a moving plate (13) is vertically limited and slidable on the inner side of the moving groove (12). The outer side of the moving plate (13) is rotatably connected to the stabilizing support plate (8), and the bottom end of the lifting rod (10) is pressed against the top of all the moving plates (13).

4. The oil sampling device with a filter structure for tight oil geological exploration according to claim 3, characterized in that: The inner wall of the hollow groove (9) is formed with a ring of protrusions, and the outer wall of the lifting rod (10) is fixedly connected to the protrusion with a first spring (11), and the inner wall of the moving plate (13) and the drilling part (2) is fixedly connected with a second spring (14).

5. The oil sampling device with a filter structure for tight oil geological exploration according to claim 4, characterized in that: The top of the drilled part (2) is formed with several guide protrusions (15), and the guide protrusions (15) are designed with downwardly expanding slopes, and the guide protrusions (15) are attached to one side of each stable support plate (8).

6. The oil sampling device with a filter structure for tight oil geological exploration according to claim 1, characterized in that: The drill bit (1) is detachably installed with the drilling machine via the mounting part (16). The top of the outer wall of the drill housing (3) is formed with a threaded protrusion, and the bottom inner wall of the mounting part (16) is provided with a matching threaded groove.

7. The oil sampling device with a filter structure for tight oil geological exploration according to claim 6, characterized in that: A hydraulic rod (17) is fixedly installed on the bottom of the inner wall of the mounting component (16), and the bottom end of the hydraulic rod (17) protrudes from the bottom of the mounting component (16) and can slide inside the hollow groove (9).

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