Resistance encounter prevention device for well logging

Abstract

The utility model discloses a resistance encounter prevention device for well logging, which relates to the technical field of petroleum well logging and comprises a cylinder, a groove is arranged at the lower end of the cylinder, elastic support structures are equidistantly arranged at the groove, and pressure sensors as many as the elastic support structures are arranged at the lower end of the cylinder. According to the utility model, the cylinder is lowered along with the logging instrument, once the well wall is abnormal, the buffer plate is blocked, the buffer plate compresses the buffer spring and is in contact with the pressure sensor, the pressure value detected by the pressure sensor is increased, and a signal is accurately transmitted to an operator on the ground in time; ground operators respectively adjust all the electric push rods according to signal control, the opening angle of the supporting rods is adjusted through stretching and retracting of the electric push rods, the supporting rollers of the supporting rods make rolling contact with the well wall, the lowering direction of the instrument is changed, obstacles are avoided, it is ensured that the logging instrument is smoothly lowered to the target layer, and it is ensured that the whole logging process is efficiently and safely completed.

Description

Technical Field

[0001] This utility model relates to the field of oil well logging technology, and in particular to a well logging anti-obstacle device. Background Technology

[0002] In oil well logging operations, wellbore conditions are complex and variable, frequently encountering problems such as wellbore collapse, diameter reduction, and foreign object adhesion, making it extremely easy for logging instruments to encounter obstacles during descent. Traditional methods of preventing obstruction often rely on operators' experience, controlling the descent speed via a surface winch, and only reacting when significant resistance is detected. This method has a significant time lag, easily leading to serious accidents such as stuck logging instruments, damaging expensive equipment, delaying operations, and increasing extraction costs. Currently available simple obstruction prevention devices have limited functionality, only capable of basic resistance sensing, and cannot adapt to the complex and variable downhole environment, failing to meet the demands of modern, efficient, and safe logging operations. Therefore, this paper presents an obstruction prevention device for well logging. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides an obstacle avoidance device for well logging. The cylinder is lowered along with the logging instrument. Upon encountering an anomaly in the well wall, the buffer plate is blocked, compressing the buffer spring. Simultaneously, the buffer plate contacts the pressure sensor, causing the pressure sensor to detect an increase in pressure and promptly transmit the signal accurately to the surface operator. Based on the signal, the surface operator adjusts each electric push rod, using the extension and retraction of the electric push rods to adjust the opening angle of the support rod. The support rollers of the support rod roll in contact with the well wall, changing the instrument's lowering direction to avoid obstacles and ensuring the logging instrument is successfully lowered to the target formation. This ensures the entire logging process is completed efficiently and safely, overcoming the shortcomings of existing technologies.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A well logging anti-obstacle device includes a cylinder, a groove at the lower end of the cylinder, elastic support structures evenly spaced at the groove, pressure sensors of the same number as the elastic support structures at the lower end of the cylinder, and adjustment mechanisms evenly spaced on the outer wall of the cylinder.

[0006] The adjustment mechanism includes a first connecting block fixed to the top of the outer wall of the cylinder, a support rod rotatably connected to the end of the first connecting block, a second connecting block fixed to the middle of the outer wall of the cylinder, an electric push rod rotatably connected to the end of the second connecting block, a third connecting block fixed to the bottom of the outer wall of one side of the support rod, and the lower end of the electric push rod rotatably connected to the third connecting block.

[0007] As a further improvement of this utility model, a support roller is installed at the lower end of the support rod.

[0008] As a further improvement of this utility model, the bottom of the side wall of the cylinder is provided with arc-shaped rods at equal intervals.

[0009] As a further improvement of this utility model: the elastic support structure includes a buffer spring fixed inside the side of the groove, and a buffer plate is welded to the lower end of the buffer spring.

[0010] As a further improvement of this utility model: a guide rod is fixed in the middle of the upper end face of the buffer plate, and the guide rod is slidably inserted into the upper end of the groove.

[0011] As a further improvement of this invention, one end of each of the buffer plates is located above a pressure sensor.

[0012] As a further improvement of this utility model: a U-shaped mounting base is fixed to the upper end of the cylinder, and a fixing hole is provided on the horizontal section of the U-shaped mounting base.

[0013] As a further embodiment of this utility model: a connecting rod is fixed between the two vertical sections of the U-shaped mounting base, a wire hole is opened in the middle of the connecting rod, and a vertical plate is fixed on the upper end face of the connecting rod on one side of the wire hole. A U-shaped clamping plate is slidably inserted into the vertical plate, and a support rod is fixed between the two inner walls of the U-shaped clamping plate. A fastening bolt is screwed into the middle of the support rod, and one end of the fastening bolt is rotatably connected to one side of the vertical plate.

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

[0015] The cylinder is lowered along with the logging instrument. If it encounters an anomaly in the well wall, the buffer plate is blocked. At the same time, the buffer plate compresses the buffer spring and comes into contact with the pressure sensor. The pressure sensor detects an increase in pressure and transmits the signal accurately to the ground operator. The ground operator then controls each electric push rod according to the signal to adjust the opening angle of the support rod by extending and retracting the electric push rod. The support roller of the support rod rolls in contact with the well wall, changing the direction of the instrument's descent, avoiding obstacles, and ensuring that the logging instrument is successfully lowered to the target formation. This ensures that the entire logging process is completed efficiently and safely. Attached Figure Description

[0016] Figure 1 This is a first-view three-dimensional structural diagram of a well logging anti-obstacle device proposed in this utility model.

[0017] Figure 2 This is a second-view three-dimensional structural diagram of a well logging anti-obstacle device proposed in this utility model.

[0018] Figure 3This utility model proposes a well logging anti-accident device. Figure 1 Enlarged structural diagram at point A in the middle.

[0019] Figure 4 This utility model proposes a well logging anti-accident device. Figure 2 Enlarged structural diagram at point B.

[0020] In the diagram: 1. Cylinder; 2. U-shaped mounting base; 3. Connecting rod; 4. First connecting block; 5. Support rod; 6. Electric push rod; 7. Support roller; 8. Second connecting block; 9. Arc rod; 10. Groove; 11. Third connecting block; 12. Wire hole; 13. U-shaped clamp; 14. Vertical plate; 15. Fastening bolt; 16. Support rod; 17. Buffer spring; 18. Guide rod; 19. Buffer plate; 20. Pressure sensor. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Example 1, referring to Figure 1-4 A well logging anti-obstacle device includes a cylinder 1, a groove 10 at the lower end of the cylinder 1, elastic support structures at equal intervals at the groove 10, pressure sensors 20 at the lower end of the cylinder 1 in the same number as the elastic support structures, adjustment mechanisms at equal intervals on the outer wall of the cylinder 1, and arc-shaped rods 9 at equal intervals on the bottom of the side wall of the cylinder 1.

[0023] The adjustment mechanism includes a first connecting block 4 fixed to the top of the outer wall of the cylinder 1, a support rod 5 rotatably connected to the end of the first connecting block 4, a second connecting block 8 fixed to the middle of the outer wall of the cylinder 1, an electric push rod 6 rotatably connected to the end of the second connecting block 8, a third connecting block 11 fixed to the bottom of the outer wall of one side of the support rod 5, the lower end of the electric push rod 6 rotatably connected to the third connecting block 11, and a support roller 7 installed at the lower end of the support rod 5.

[0024] The elastic support structure includes a buffer spring 17 fixed inside the side of the groove 10. A buffer plate 19 is welded to the lower end of the buffer spring 17. A guide rod 18 is fixed to the middle of the upper end face of the buffer plate 19. The guide rod 18 is slidably inserted into the upper end of the groove 10. One end of each buffer plate 19 is located above a pressure sensor 20.

[0025] The cylinder 1 is lowered along with the logging instrument. If it encounters an anomaly in the well wall, the buffer plate 19 will be blocked. At the same time, the buffer plate 19 compresses the buffer spring 17 and comes into contact with the pressure sensor 20. The pressure sensor 20 detects an increase in pressure and transmits the signal accurately to the ground operator in a timely manner. The ground operator controls each electric push rod 6 according to the signal. The extension and retraction of the electric push rod 6 adjusts the opening angle of the support rod 5, and the support roller 7 of the support rod 5 rolls in contact with the well wall, changing the direction of the instrument's descent, avoiding obstacles, and ensuring that the logging instrument is successfully lowered to the target formation, ensuring that the entire logging process is completed efficiently and safely.

[0026] Example 2 is an optimization based on Example 1, specifically:

[0027] A U-shaped mounting base 2 is fixed to the upper end of the cylinder 1. A fixing hole is provided on the horizontal section of the U-shaped mounting base 2. A connecting rod 3 is fixed between the two vertical sections of the U-shaped mounting base 2. A wire hole 12 is provided in the middle of the connecting rod 3. A vertical plate 14 is fixed to the upper end face of the connecting rod 3 on one side of the wire hole 12. A U-shaped clamp 13 is slidably inserted into the vertical plate 14. A support rod 16 is fixed between the two inner walls of the U-shaped clamp 13. A fastening bolt 15 is screwed into the middle of the support rod 16. One end of the fastening bolt 15 is rotatably connected to one side of the vertical plate 14.

[0028] The logging instrument can be fixed on the U-shaped mounting base 2. The cable can pass through the cable hole 12 and the U-shaped clamp 13. The U-shaped clamp 13 can be moved by the fastening bolt 15. Then, the cable can be clamped by the U-shaped clamp 13 and the upright plate 14 to limit the cable and prevent the cable connector from falling off during the lowering process.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A drag preventer for well logging, comprising a cylinder (1), characterized in that The lower end of the cylinder (1) is provided with a groove (10), and the groove (10) is provided with an elastic support structure at equal intervals. The adjusting mechanism comprises a first connecting block (4) fixed on the top of the outer wall of the cylinder (1), and the end of the first connecting block (4) is rotatably connected with a support rod (5).

2. The anti-sticking device for well logging according to claim 1, characterized in that, The lower end of the support rod (5) is provided with a support roller (7).

3. The anti-sticking device for well logging according to claim 1, wherein The bottom of the side wall of the cylinder (1) is provided with an arc-shaped rod (9) at equal intervals.

4. The anti-sticking device for well logging according to claim 1, wherein The elastic support structure comprises a buffer spring (17) fixed on the inner side of the groove (10), and the lower end of the buffer spring (17) is welded with a buffer plate (19).

5. The anti-sticking device for use in well logging according to claim 4, characterized in that The upper end surface of the buffer plate (19) is fixed with a guide rod (18) at the middle, and the guide rod (18) is slidingly inserted into the upper end of the groove (10).

6. The anti-sticking device for use in well logging according to claim 5, characterized in that One end of each buffer plate (19) is located above one pressure sensor (20).

7. The anti-sticking device for well logging according to claim 1, wherein The upper end of the cylinder (1) is fixed with a U-shaped mounting seat (2), and the horizontal section of the U-shaped mounting seat (2) is provided with a fixing hole.

8. The anti-sticking device for use in well logging according to claim 7, characterized in that The two vertical sections of the U-shaped mounting seat (2) are fixed with a connecting rod (3), and the middle of the connecting rod (3) is provided with a wire hole (12). The upper end surface of the connecting rod (3) is located on one side of the wire hole (12) and is fixed with a vertical plate (14), and the vertical plate (14) is slidingly inserted with a U-shaped clamping plate (13). The two inner walls of the U-shaped clamping plate (13) are fixed with a support rod (16), and the middle of the support rod (16) is screwed with a fastening bolt (15).

Images