Highly inclined oscillating cardan joint

Abstract

The utility model relates to the technical field of petroleum logging, especially relates to a high-inclination oscillation type universal joint. The device includes upper joint mechanism, bending mechanism, oscillation mechanism, lower joint mechanism, the bending mechanism includes upper anti -rotation shell, the core axle with cable core passageway, lower anti -rotation shell, the core axle middle part outer wall is equipped with arc convex surface, and is designed axial positioning key respectively on the upper and lower ends of arc convex surface, the inner wall of upper anti -rotation shell, lower anti -rotation shell all is equipped with positioning slot and is respectively installed on the positioning key of core axle upper and lower end, and there is gap between upper anti -rotation shell, lower anti -rotation shell and core axle. The utility model realizes having the function of inclined oscillation, and when meeting the card, the test instrument is pulled back and forth, and the universal joint oscillation effect is good, and the test instrument can be smoothly unjammed.

Description

Technical fields:

[0001] This utility model relates to the field of oil well logging technology, and in particular to a large-angle oscillating universal joint. Background technology:

[0002] When testing production oil, gas, and water wells, a flexible short section is typically connected between the two testing instruments. When the testing instrument is lowered into an inclined oil well, it often gets stuck and cannot pass smoothly. In this case, it needs to be pulled back and forth to free the instrument. However, existing flexible short sections only have flexible bending capabilities and cannot produce a significant vibration effect during pulling, making it difficult to successfully free the testing instrument. Furthermore, existing flexible short sections also have drawbacks such as limited strength and load-bearing capacity, and susceptibility to sealing performance damage. Utility model content:

[0003] The technical problem to be solved by this utility model is to provide a large-angle oscillating universal joint. This device realizes the tilting oscillation function. When encountering a jam, it pulls the testing instrument back and forth. The universal joint has a good up-and-down oscillation effect, which can enable the testing instrument to be easily released from the jam.

[0004] The technical solution adopted by this utility model is: a large-angle oscillating universal joint, including an upper connector mechanism, a bending mechanism, an oscillating mechanism, and a lower connector mechanism, which are connected sequentially;

[0005] The bending mechanism includes an upper anti-rotation shell, a core shaft with a cable core channel, and a lower anti-rotation shell. The outer wall of the core shaft has an arc-shaped convex surface in the middle, and axial positioning keys are designed at the upper and lower ends of the arc-shaped convex surface. The inner walls of the upper and lower anti-rotation shells are provided with positioning grooves and are respectively fitted onto the positioning keys at the upper and lower ends of the core shaft. There are gaps between the upper and lower anti-rotation shells and the core shaft.

[0006] The oscillation mechanism includes an upper nut, an upper spring, a lower nut, and a lower spring. The upper nut and the lower nut are respectively connected to the upper and lower ends of the spindle. The upper spring is installed between the upper nut and the upper anti-rotation housing, and the lower spring is installed between the lower nut and the lower anti-rotation housing.

[0007] Furthermore, the end faces of the upper anti-rotation shell and the lower anti-rotation shell that contact the arc-shaped convex surface of the spindle are designed as arc surfaces.

[0008] Furthermore, the upper connector mechanism includes an upper connector, an upper transition connector, and a cable core sealing mechanism. The upper inner wall of the upper connector is connected to a socket, the lower end of the upper connector is connected to the upper transition connector, the upper inner wall of the upper transition connector is connected to the cable core sealing mechanism, and the lower end of the upper transition connector is fitted with an anti-rotation housing.

[0009] Furthermore, the lower connector mechanism includes a lower connector, a lower transition connector, and a cable core sealing mechanism. The lower inner wall of the lower connector is connected to a plug, the upper end of the lower connector is connected to the lower transition connector, the lower inner wall of the lower transition connector is connected to the cable core sealing mechanism, and the upper end of the lower transition connector has an anti-rotation housing.

[0010] Furthermore, the cable core sealing mechanism includes a sealing combination gasket and a clamping screw. The sealing combination gasket includes a copper gasket and a sealing rubber gasket arranged in a cross pattern. The sealing combination gasket is disposed on the inner wall steps of the upper transition joint and the lower transition joint. The clamping screw is connected to the inner wall of the upper transition joint and the lower transition joint and squeezes the sealing combination gasket, thereby sealing the gap between the upper transition joint, the lower transition joint and the cable core.

[0011] The beneficial effects of this utility model are:

[0012] 1. It has an oscillation function. When the instrument is stuck, the universal joint is pulled back and forth. The oscillation effect is good, which can help the instrument to get out of the stuck smoothly.

[0013] 2. A graded sealing method is adopted to gradually achieve complete sealing, meet insulation requirements, and ensure signal transmission. Attached image description:

[0014] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] Figure 2 This is a schematic diagram of the mandrel structure.

[0017] Figure 3 This is a schematic diagram of the structure of the upper anti-rotation shell.

[0018] Figure 4 This is a cross-sectional schematic diagram of the upper anti-rotation shell. Detailed implementation method:

[0019] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, a high-angle oscillating universal joint includes an upper connector mechanism, a bending mechanism, an oscillating mechanism, and a lower connector mechanism, which are connected sequentially. In the title of this patent, "a high-angle oscillating universal joint", "high angle" refers to an inclination angle range of 0-47 degrees.

[0020] The bending mechanism includes an upper anti-rotation housing 3, a core shaft 1 with a cable core channel, and a lower anti-rotation housing 4. The outer wall of the core shaft 1 is provided with an arc-shaped convex surface in the middle, and axial positioning keys 2 are designed at the upper and lower ends of the arc-shaped convex surface. The inner walls of the upper anti-rotation housing 3 and the lower anti-rotation housing 4 are provided with positioning grooves 18, which are respectively fitted onto the positioning keys 2 at the upper and lower ends of the core shaft 1. There are gaps between the upper anti-rotation housing 3 and the lower anti-rotation housing 4 and the core shaft 1.

[0021] The oscillation mechanism includes an upper nut 5, an upper spring 6, a lower nut 7, and a lower spring 8. The upper nut 5 and the lower nut 7 are respectively connected to the upper and lower ends of the spindle 1. The upper spring 6 is installed between the upper nut 5 and the inner wall step of the upper anti-rotation housing 3, and the lower spring 8 is installed between the lower nut 7 and the inner wall step of the lower anti-rotation housing 4.

[0022] The end faces of the upper anti-rotation shell 3 and the lower anti-rotation shell 4 that contact the arc-shaped convex surface of the spindle 1 are designed as arc surfaces, which facilitates the formation of a certain angle between the upper anti-rotation shell 3, the lower anti-rotation shell 4 and the spindle 1. The arc surface allows bending in every direction, realizing the function of being able to be bent in all directions.

[0023] The upper connector mechanism includes an upper connector 10, an upper transition connector 12, and a cable core sealing mechanism. The upper inner wall of the upper connector 10 is connected to a socket 9, the lower end of the upper connector 10 is connected to the upper transition connector 12, the upper inner wall of the upper transition connector 12 is connected to the cable core sealing mechanism, the lower end of the upper transition connector 12 is connected to an anti-rotation shell 3, and the upper end of the upper connector 10 is connected to a protective wire 17.

[0024] The lower connector mechanism includes a lower connector 14, a lower transition connector 13, and a cable core sealing mechanism. The lower inner wall of the lower connector 14 is connected to a plug 15, the upper end of the lower connector 14 is connected to the lower transition connector 13, the lower inner wall of the lower transition connector 13 is connected to the cable core sealing mechanism, the upper end of the lower transition connector 13 is connected to an anti-rotation shell 4, and the lower end of the lower connector 14 is connected to a protective cap 16.

[0025] The cable core sealing mechanism includes a sealing combination gasket and a clamping screw 11. The sealing combination gasket includes a copper gasket and a sealing rubber gasket arranged in a cross pattern. The sealing combination gasket is disposed on the inner wall steps of the upper transition joint 12 and the lower transition joint 13. The clamping screw 11 is connected to the inner wall of the upper transition joint 12 and the lower transition joint 13 and squeezes the sealing combination gasket, thereby sealing the gap between the upper transition joint 12, the lower transition joint 13 and the cable core.

[0026] When in use, this utility model is connected in series in the middle of the testing instrument. There is a gap between the upper anti-rotation shell 3, the lower anti-rotation shell 4 and the spindle 1. Therefore, the middle part of this utility model can be bent at a certain angle, so that the testing instrument can pass smoothly through the curved well section.

[0027] There is a gap between the upper anti-rotation shell 3, the lower anti-rotation shell 4 and the spindle 1, which allows them to bend. At the same time, the upper anti-rotation shell 3, the lower anti-rotation shell 4 and the spindle 1 are connected by a keyway. The width of the positioning groove 18 of the upper anti-rotation shell 3 and the lower anti-rotation shell 4 is greater than the width of the positioning key 2. In this way, the upper anti-rotation shell 3 and the lower anti-rotation shell 4 can rotate within a certain range relative to the spindle 1, but it also restricts free rotation.

[0028] An oscillation mechanism is set at the upper and lower ends of the bending mechanism. When the testing instrument gets stuck, the logging instrument is pulled back and forth. The upper anti-rotation shell 3 and the lower anti-rotation shell 4 move along the axial positioning key 2 of the spindle 1 under the action of the pulling force, thereby compressing the upper spring 6 and the lower spring 8. After being compressed, the upper spring 6 and the lower spring 8 will bounce back. In this way, the present invention produces a significant oscillation effect, so that the testing instrument can be successfully unstuck.

[0029] This invention incorporates a cable core sealing mechanism in both the upper and lower connector mechanisms, which effectively seals the cable core inside the invention to meet insulation requirements and ensure signal transmission.

[0030] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A large-angle oscillating universal joint, characterized in that: It includes an upper connector mechanism, a bending mechanism, a vibration mechanism, and a lower connector mechanism, which are connected sequentially. The bending mechanism includes an upper anti-rotation shell, a core shaft with a cable core channel, and a lower anti-rotation shell. The outer wall of the core shaft has an arc-shaped convex surface in the middle, and axial positioning keys are designed at the upper and lower ends of the arc-shaped convex surface. The inner walls of the upper and lower anti-rotation shells are provided with positioning grooves and are respectively fitted onto the positioning keys at the upper and lower ends of the core shaft. There are gaps between the upper and lower anti-rotation shells and the core shaft. The oscillation mechanism includes an upper nut, an upper spring, a lower nut, and a lower spring. The upper nut and the lower nut are respectively connected to the upper and lower ends of the spindle. The upper spring is installed between the upper nut and the upper anti-rotation housing, and the lower spring is installed between the lower nut and the lower anti-rotation housing.

2. The large-angle oscillating universal joint according to claim 1, characterized in that: The end faces of the upper anti-rotation shell and the lower anti-rotation shell that contact the arc-shaped convex surface of the spindle are designed as arc surfaces.

3. The large-angle oscillating universal joint according to claim 1, characterized in that: The upper connector mechanism includes an upper connector, an upper transition connector, and a cable core sealing mechanism. The upper inner wall of the upper connector is connected to a socket, the lower end of the upper connector is connected to the upper transition connector, the upper inner wall of the upper transition connector is connected to the cable core sealing mechanism, and the lower end of the upper transition connector is fitted with an anti-rotation shell.

4. The large-angle oscillating universal joint according to claim 1, characterized in that: The lower connector mechanism includes a lower connector, a lower transition connector, and a cable core sealing mechanism. The lower inner wall of the lower connector is connected to a plug, the upper end of the lower connector is connected to the lower transition connector, the lower inner wall of the lower transition connector is connected to the cable core sealing mechanism, and the upper end of the lower transition connector has an anti-rotation shell.

5. The large-angle oscillating universal joint according to claim 3 or 4, characterized in that: The cable core sealing mechanism includes a sealing combination gasket and a clamping screw. The sealing combination gasket includes a copper gasket and a sealing rubber gasket arranged in a cross pattern. The sealing combination gasket is disposed on the inner wall steps of the upper transition joint and the lower transition joint. The clamping screw is connected to the inner wall of the upper transition joint and the lower transition joint and squeezes the sealing combination gasket, thereby sealing the gap between the upper transition joint, the lower transition joint and the cable core.

Images