CN219262322U - Eccentric device for logging - Google Patents

Abstract

The utility model relates to an eccentric device for logging, which comprises a body, wherein at least one end of the body is provided with a logging element, a sliding rail is arranged on the body, a sliding ring and an elastic piece are arranged on the sliding rail, and two ends of the elastic piece are connected to the sliding ring, so that the two ends of the elastic piece can move on the sliding rail under the action of external force, and the curvature of the elastic piece is changed. Wherein, both ends of elastic component are provided with the guard plate, the elastic component passes through the guard plate to be connected on the sliding ring. The eccentric device for well logging can effectively reduce the risk of fracture of the elastic piece or detachment of the elastic piece from the slip ring, and improve the stability of the eccentric device.

Description

Eccentric device for logging

Technical Field

The utility model relates to the field of drilling, in particular to an eccentric for logging.

Background

In oil logging, eccentric logging is a common logging method. The method is to install the nuclear magnetic resonance logging instrument, the density logging instrument and other logging instruments on the eccentric device, and push the logging instrument against the other side of the well wall by utilizing the self tension of the elastic piece on the eccentric device, so that the logging instrument is clung to the well wall, thereby completing logging operation.

Existing logging eccentrics typically connect the elastic member directly to a slip ring on the eccentric. The connecting mode can easily break the connecting part of the elastic piece and the slip ring after long-time use, thereby causing production accidents such as instrument clamping well and the like, even affecting other externally hung equipment and causing serious influence on logging operation.

Disclosure of Invention

In view of the technical problems described above, the present utility model aims to propose an eccentric for logging. The eccentric device for well logging can effectively reduce the risk of fracture of the elastic piece or detachment of the elastic piece from the slip ring, and improve the stability of the eccentric device.

According to the utility model, an eccentric device for logging is provided, which comprises a body, wherein at least one end of the body is provided with a logging element, a sliding rail is arranged on the body, a sliding ring and an elastic piece are arranged on the sliding rail, and two ends of the elastic piece are connected to the sliding ring, so that the two ends of the elastic piece can move on the sliding rail under the action of external force, and the curvature of the elastic piece is changed.

Wherein, both ends of elastic component are provided with the guard plate, the elastic component passes through the guard plate to be connected on the sliding ring.

In a preferred embodiment, the protection plate is configured in a "U" shape, and includes a first plate body and a second plate body disposed opposite to each other, and an opening allowing the elastic member to extend is formed between first ends of the first plate body and the second plate body, and second ends of the first plate body and the second plate body form a sealed connection.

In a preferred embodiment, a first through hole is formed in the first plate body and the second plate body, a second through hole which can be correspondingly communicated with the first through hole is formed in the end portion of the elastic piece, and the protection plate and the elastic piece are connected through a first pin shaft penetrating through the first through hole and the second through hole.

In a preferred embodiment, a groove is provided in the slip ring, the second ends of the first and second plates being secured in the groove by a second pin, which is provided as a swivel pin.

In a preferred embodiment, a damping sleeve is also provided at the outer end of the slip ring remote from the elastic element, said damping sleeve being made of an elastic material.

In a preferred embodiment, the end of the damping sleeve remote from the elastic element is configured as a cone.

In a preferred embodiment, the damping sleeve is connected to the slip ring by means of a roll pin.

In a preferred embodiment, protective caps are provided at each end of the body, the protective caps defining a cavity therein, the logging element being disposed within the cavity.

In a preferred embodiment, a joint is further provided between the body and the cap, the cap being connected to the joint by means of a screw thread.

In a preferred embodiment, the elastic element is provided as a bow spring.

Drawings

The present utility model will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic of an eccentric for logging in accordance with one embodiment of the present utility model in connection with a wellbore.

FIG. 2 is a schematic illustration of the connection of the elastic member to the body of the eccentric for well logging shown in FIG. 1.

In this application, all of the figures are schematic drawings which are intended to illustrate the principles of the utility model and are not to scale.

Detailed Description

The utility model is described below with reference to the accompanying drawings.

Fig. 1 shows a schematic view of an eccentric 100 for logging according to one embodiment of the utility model. As shown in fig. 1, the eccentric 100 for logging includes a body 10 that can extend into an oil well. The body 10 is configured in a rod shape. A logging element 18 for logging is provided on the body 10.

As shown in fig. 1, an elastic member 20 is connected to the body 10, and the elastic member 20 may be, for example, an arch spring. Specifically, a slide rail 12 is provided on the body 10, and a slip ring 15 is provided on the slide rail 12, and the slip ring 15 is slidable on the slide rail 12 along the axial direction of the body 10. The two ends of the elastic member 20 are respectively connected to the slip ring 15. Thereby, the elastic member 20 can move on the slide rail 12, thereby changing the curvature of the elastic member 20.

Thus, when the eccentric 100 is extended into an oil well, the elastic member 20 can be abutted against a well wall (not shown) and support the body 10 such that the body 10 is abutted against the well wall on the other side opposite to the elastic member 20. Thereby, the logging element 18 on the body 10 can be attached to the well wall, and the measurement operation of the oil well is completed. When the diameter of the well wall is increased, the elastic member 20 can be stretched under the action of self-elastic force, so as to increase the self-curvature. And when the diameter of the well wall is reduced, the elastic member 20 can contract under the extrusion of the well wall, so as to reduce the curvature of the elastic member. Therefore, when the diameter of the well wall is changed, the elastic piece 20 can always support the body 10, and the body 10 is ensured to be clung to the well wall.

Since the well wall is generally an irregular and uneven wall body, and it is also difficult to avoid having various irregular protrusions on the well wall, the diameter of the well wall is frequently changed during actual logging operations, thereby causing the elastic member 20 to be stretched or contracted. And during the expansion or contraction of the elastic member 20, both ends of the elastic member 20 rotate with respect to the slip ring 15. During frequent rotation, the elastic member 20 is easily worn or broken, thereby being detached from the body 10, resulting in failure of the eccentric 100.

Therefore, in the present utility model, shielding plates 30 are provided at both ends of the elastic member 20. The elastic member 20 is connected to the slip ring 15 by a shielding plate 30. The protection plate 30 can protect the elastic member 20 from abrasion or breakage of the elastic member 20, and can enhance the connection between the elastic member 20 and the slip ring 15, thereby improving the stability of the eccentric 100.

Fig. 2 is a schematic diagram showing the connection of the elastic member 20 of the eccentric 100 for logging of a well shown in fig. 1 to the body 10. As shown in fig. 2, the protection plate 30 is configured in a "U" shape, which includes a first plate body 32 and a second plate body 34 disposed opposite to each other, with a gap 35 between the first plate body 32 and the second plate body 34. The first plate 32 and the second plate 34 are formed with an opening 36 near the first end of the elastic member 20, and a closed connection is formed at the second end far from the elastic member 20. The elastic element 20 can thus protrude from the opening 36 into the gap 35.

After the elastic member 20 extends into the gap 35, the elastic member 20 and the protection plate 30 form a fixed connection through the first pin shaft 31. Specifically, first through holes 341 are provided at corresponding positions of the first plate body 32 and the second plate body 34. While a second through hole (not shown) is provided at an end of the elastic member 20. When the elastic member 20 extends into the gap 35, the second through hole can be moved to a position corresponding to the first through hole 341, so that the first pin shaft 31 can sequentially pass through the first through hole 341 and the second through hole to fixedly connect the elastic member 20 with the protection plate 30.

When the elastic member 20 needs to be replaced, the elastic member 20 can be pulled out from the protection plate 30 only by removing the first pin shaft 31, so that a new elastic member 20 is installed. By this connection, the replacement work of the elastic member 20 can be effectively simplified.

As shown in fig. 2, a groove 151 is provided in the slip ring 15. The second ends of the first plate 32 and the second plate 34 are fixed in the groove 151 by a second pin 152, thereby forming a connection between the protection plate 30 and the slip ring 15. In the present utility model, the second pin 152 is provided as a rotation pin. So that the shielding plate 30 can rotate with respect to the slip ring 15, thereby converting the relative rotation occurring between the elastic member 20 and the slip ring 15 into the relative rotation between the shielding plate 30 and the slip ring 15, thereby reducing the wear of the elastic member 20.

In the present utility model, the protection plate 30 may also be made of wear-resistant metal materials, so as to improve the service life of the protection plate 30.

As shown in fig. 2, a damping sleeve 40 is further sleeved on the outer end of the slip ring 15 away from the elastic member 20. The damping sleeve 40 is made of an elastic material, which may be rubber, for example. When the deformation of the well wall is large, the elastic member 20 is deformed to a large extent, the slip ring 15 slides rapidly on the slide rail 12, so that it is easy to strike the end (not shown) of the slide rail 12. When the slip ring 15 collides with the end of the sliding rail 12, the damping sleeve 40 can play a role of buffering, and shaking caused by collision is reduced, so that the vibration of the elastic member 20 is reduced. It will be readily appreciated that when the amplitude of vibration of the elastic member 20 is reduced, the amplitude and speed of rotation thereof relative to the slip ring 15 are correspondingly reduced, thereby enabling further reduction in the impact and wear to which the elastic member 20 is subjected.

Further, the end 42 of the damping sleeve 40 remote from the elastic element 20 is configured as a cone. It will be readily appreciated that the tapered plane is more advantageous than the vertical plane in reducing the risk of the entire logging eccentric 100 moving in the wellbore while also reducing the impact from the impact during the impact, thereby helping to further enhance the cushioning effect of the damping sleeve 40.

In a preferred embodiment, the damping sleeve 40 is connected to the slider 15 by a roll pin 48. The roll pin 48 has better elasticity than a conventional pin, thereby being more advantageous to absorb impact force caused by impact.

As shown in fig. 1, a protective cap 60 is disposed at least one end of the body 10, a cavity 65 is defined in the protective cap 60, and the logging element 18 is disposed in the cavity 65. The protective cap 60 can protect the logging element 18, so as to prevent the logging element 18 from being damaged due to the collision of the logging element 18 on the convex part of the well wall during the logging process.

Meanwhile, a joint 70 is further provided between the body 10 and the protective cap 60. The adapter 70 is provided with threads (not shown). The protective cap 60 is connected with the connector 70 through threads, so that the protective cap 60 is connected with the body 10. Thus, when a different type of logging element 18 needs to be replaced, the cap 60 can be removed from the body by simply rotating the cap 60. With this arrangement, the process required to replace the logging elements 18 is facilitated.

The operation of the eccentric 100 for logging according to the present utility model is briefly described as follows.

The eccentric 100 for logging of the present utility model is used for logging operations on an oil well. During the logging process, the operator moves the body 10 within the well by driving it in a downhole tool. During the movement of the body 10, the elastic member 20 can abut against the well wall, so as to support the body 10, and make the body 10 closely contact with the well wall. When the diameter of the well wall changes, the elastic member 20 can be adaptively stretched or contracted, so as to drive the elastic member 20 to rotate relative to the slip ring 15.

During the rotation of the elastic member 20, the protection plate 30 can prevent the end portion of the elastic member 20 from directly rotating relative to the slip ring 15, thereby protecting the elastic member 20 from abrasion or breakage.

When the slip ring 15 impacts the end of the sliding rail 12, the damping sleeve 40 can absorb the impact caused by the impact, so as to reduce the vibration generated by the elastic member 20, thereby further avoiding the abrasion or breakage of the elastic member 20.

Finally, it should be noted that the above description is only of a preferred embodiment of the utility model and is not to be construed as limiting the utility model in any way. Although the utility model has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the techniques described in the foregoing examples, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. An eccentric for logging, comprising:

a rod-shaped body (10) with a logging element (18) at least one end, a sliding rail (12) on the body, a sliding ring (15) on the sliding rail, and,

the two ends of the elastic piece (20) are connected to the slip ring, so that the two ends of the elastic piece can move on the sliding rail under the action of external force, thereby changing the curvature of the elastic piece,

wherein, both ends of the elastic piece are provided with protection plates (30), and the elastic piece is connected to the slip ring through the protection plates.

2. An eccentric for logging according to claim 1, wherein the guard is configured in a "U" shape comprising a first plate (32) and a second plate (34) arranged opposite each other, an opening (36) being formed between the first ends of the first and second plates allowing the elastic member to extend into, the second ends of the first and second plates forming a closed connection.

3. An eccentric for logging according to claim 2, characterized in that a first through hole (341) is provided in the first and second plate body, a second through hole capable of corresponding communication with the first through hole is provided in the end of the elastic member, and the guard plate and the elastic member are connected by a first pin (31) passing through the first and second through holes.

4. An eccentric for logging according to claim 3, characterized in that a groove (151) is provided on the slip ring, in which groove the second ends of the first and second plate bodies are fixed by means of a second pin shaft (152), which is provided as a swivel pin.

5. An eccentric for logging according to any of claims 1-4, characterized in that a damping sleeve (40) is also sleeved at the outer end of the slip ring remote from the elastic member, said damping sleeve being made of an elastic material.

6. The eccentric for well logging of claim 5, wherein an end (42) of the damping sleeve remote from the resilient member is configured as a cone.

7. The eccentric for logging of claim 6, wherein the damping sleeve is connected to the slip ring by a roll pin (48).

8. Eccentric for logging according to any of claims 1-4, characterized in that a protective cap (60) is provided at each end of the body, the protective cap having a cavity (65) defined therein, the logging element being arranged in the cavity.

9. An eccentric for logging according to claim 8, characterized in that a joint (70) is further provided between the body and the cap, which is connected by means of a screw thread.

10. An eccentric for logging in accordance with any of claims 1-4, wherein the resilient member is provided as a bow spring.

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