Rotary jam releasing device for steel wire well testing

Abstract

The utility model relates to the technical field of shale underground jam releasing, and discloses a steel wire well testing rotary jam releasing device which comprises a shell, a power piece and a rotating piece, the shell is cylindrical, a sliding cavity, a connecting cavity and a rotating cavity are formed in the shell and communicated in sequence, through holes are formed in the two ends of the rotating cavity, and a center rod, a guide shaft and a sliding plate in the power piece are fixedly connected in sequence. The center rod is connected with the weighting rod through the upper connector, the guide shaft is slidably installed in the sliding cavity and the rotating piece, the rotating shaft is fixedly connected with the connecting rod, the rotating shaft is rotatably installed in the rotating cavity, the connecting rod is connected with the measuring tool through the lower connector, the sliding plate is attached to the rotating shaft, and the sliding piece on the sliding plate is slidably installed in a track groove of the rotating shaft. The track groove is an annular groove extending in the axial direction. The technical problem that when an existing jam releasing device works under special well conditions, effective jam releasing cannot be achieved due to the fact that the falling speed of a weighting rod is limited is solved.

Description

Technical Field

[0001] This utility model relates to the field of shale well downhole unblocking technology, specifically to a wireline well testing rotary unblocking device. Background Technology

[0002] In oil and gas field development, wireline instruments are typically run downhole to test and obtain multi-dimensional downhole parameters, such as pressure, temperature, flow rate, and fluid properties. However, in actual testing operations, the wellbore environment is complex and variable, presenting numerous unfavorable factors. Debris, sludge, wax, and other impurities inevitably accumulate inside the wellbore. These impurities are easily adsorbed or entangled on the surface of the testing instrument during the lowering or raising of the testing tool, causing the instrument to become stuck inside the wellbore. Once stuck, because the tensile strength of the wireline itself is relatively low, forcibly raising the wireline to release it could cause the tensile force to exceed its ultimate strength, leading to a wireline breakage accident.

[0003] To address potential jamming issues during testing, a shock absorber and a weighted rod are typically added to the testing tool assembly. The working principle is that when the testing tool becomes stuck, the ground operator moves a steel cable to quickly transmit a powerful upward shock force to the jamming point, loosening the jam and thus releasing the tool. During this process, the shock absorber moves downwards to accumulate shock energy, its speed primarily achieved by the weighted rod sliding down under gravity. In typical vertical wells, due to the relatively simple wellbore trajectory, the weighted rod descends smoothly, and its gravity acts directly and effectively on the shock absorber, generating a sufficiently large shock force. This shock-based release method usually achieves good results and effectively resolves jamming issues.

[0004] However, when operating in special well conditions such as highly deviated wells, horizontal wells, and high-viscosity wells, the existing shock-based release method reveals significant shortcomings. In highly deviated and horizontal wells, the wellbore trajectory exhibits a large angle of curvature or a horizontal extension. This results in the weight rod being affected by multiple factors during its descent, including frictional resistance from the well wall, changes in the gravity component, and fluid resistance within the wellbore, severely limiting its descent speed. The weight rod cannot descend as quickly and smoothly as in vertical wells, preventing its gravity from acting sufficiently and effectively on the shock absorber, thus significantly reducing the shock force generated by the shock absorber.

[0005] In high-viscosity wells, the higher viscosity of the fluid inside the wellbore further increases the resistance to the descent of the weight rod, making its descent speed even slower and hindering the accumulation of sufficient energy to generate an effective impact force. Under these special well conditions, existing shock-based unblocking methods often fail to achieve the desired unblocking effect due to insufficient impact force. Utility Model Content

[0006] The present invention aims to provide a wireline well testing rotary unblocking device to solve the technical problem that existing unblocking devices, when applied to special well conditions, have limited falling speed of the weight rod, making them unable to effectively unblock the wireline.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a steel wire well test rotary unblocking device, comprising a housing, a power component and a rotating component, the housing being cylindrical, and a sliding cavity and a rotating cavity being sequentially arranged along the axial direction inside the housing, the sliding cavity and the rotating cavity being connected by a connecting cavity, a first through hole being provided on the end face of the housing near the rotating cavity, and a second through hole being provided on the end face of the housing near the sliding cavity;

[0008] The power component includes a central rod, a guide shaft, and a sliding plate. The central rod, guide shaft, and sliding plate are fixedly connected in sequence along the axial direction of the housing. The central rod passes through the second through hole. The end of the central rod away from the guide shaft is provided with an upper connector located outside the housing for connecting with the weight rod. The guide shaft is slidably installed in the sliding cavity. The axial length of the guide shaft is less than the axial length of the sliding cavity.

[0009] The rotating component includes a rotating shaft and a connecting rod, which are fixedly connected axially. The rotating shaft is rotatably installed in the rotating cavity, and the connecting rod passes through the first through hole. The end of the connecting rod away from the rotating shaft is provided with a lower connector located outside the housing for connection with a measuring tool. The sliding plate passes through the connecting cavity and fits against the rotating shaft. The rotating shaft is provided with a track groove, which is an annular groove extending axially along the rotating shaft. The sliding plate is provided with a sliding member, which is located between the rotating shaft and the sliding plate and is slidably installed in the track groove.

[0010] The principle and advantages of this scheme are as follows: During actual measurement, a measuring tool string is lowered into the well via a steel wire. From bottom to top, the measuring tool string consists of the measuring tool, a rotary unblocking device, and a weight rod. When the measuring tool gets stuck, the weight rod moves up and down by raising and lowering the steel wire. The weight rod drives the central rod, guide shaft, and sliding plate to reciprocate. The sliding plate drives the sliding component to move along the track groove in the rotating shaft. Since the track groove is an annular groove extending axially along the rotating shaft, the sliding of the sliding component in the track groove forces the rotating shaft to rotate around its axis, thereby driving the connecting rod and the measuring tool connected to the connecting rod to rotate, thus achieving rotary unblocking.

[0011] In special well conditions (such as highly deviated wells, horizontal wells, and high-viscosity wells), the limited falling speed of the weight rod no longer affects the unblocking effect. In traditional shock unblocking, the impact force depends on the falling speed of the weight rod. However, in complex well conditions, the weight rod's fall is obstructed, resulting in insufficient impact force. This device, however, uses a steel wire to drive the weight rod up and down, generating sliding force, which is then converted into rotational force on the rotating shaft. This causes the measuring tool to rotate and break free from the obstruction or entanglement of debris in the well. The falling speed of the weight rod does not affect the final rotation amplitude of the measuring tool, making it more suitable for use in complex wells. The rotational unblocking method can more effectively address the problem of impurities adhering to or entangled in the testing instrument within the wellbore. By rotating the measuring tool, the instrument's posture within the wellbore is changed, making it easier for impurities originally adhering to or entangled on the instrument's surface to detach, thus achieving unblocking. Compared to simple shock unblocking, the success rate is higher.

[0012] As an improvement, the inner wall of the housing is provided with a limiting groove, the opening of the limiting groove faces the rotating cavity, and the limiting groove is a straight groove extending along the axial direction of the housing. The sliding plate is also provided with a limiting protrusion, which is located between the sliding plate and the housing and is slidably installed in the limiting groove.

[0013] The beneficial effects of this improvement are as follows: By setting a limiting groove on the inner wall of the housing, and the limiting groove being a straight groove extending along the axial direction of the housing, and setting a limiting protrusion on the slide plate, the limiting protrusion is slidably installed in the limiting groove. In this way, during the reciprocating motion of the slide plate with the guide shaft, the limiting groove can strictly limit the rotation of the slide plate relative to the housing, so that the sliding force of the slide plate in the axial direction can be more directly and effectively converted into the rotational force of the rotating shaft, reducing the energy loss caused by the rotation of the slide plate, improving the energy conversion efficiency of the device, and thus enhancing the effect of rotational unlocking.

[0014] As an improvement, the slide plate is an arc-shaped plate that fits against the circumferential surface of the rotation axis.

[0015] The beneficial effects of this improvement are as follows: The curved plate design avoids interference between the translation of the sliding plate and the rotation of the rotation axis. During the reciprocating motion of the sliding plate driving the rotation axis, the shape of the curved plate better adapts to the circumferential surface of the rotation axis, ensuring the coordination of their movements and making the device operate more smoothly. Furthermore, the curved plate structure better restricts the movement trajectory of the sliding component, preventing it from detaching from the track groove, thus improving the reliability and stability of the device and ensuring the smooth operation of the rotational unlocking process.

[0016] As an improvement, the sliding element includes a ball and a ball seat, one end of which is fixedly mounted on the slide plate, and the other end of which is a concave spherical surface, the concave spherical surface of which fits against the surface of the ball.

[0017] The beneficial effects of this improvement are: this structure makes the relative movement between the slide plate and the rotating shaft smoother. When the slide plate reciprocates and drives the sliding component to slide in the track groove, the ball can roll in the track groove. Compared with sliding friction, rolling friction has less frictional force, reducing energy loss, reducing wear during device operation, and extending the service life of the device. At the same time, it also ensures that the rotating shaft can rotate more easily and smoothly, improving the efficiency of rotary unlocking.

[0018] As an improvement, the two ends of the rotating shaft are respectively connected to the bearing mounting cavity and the first through hole.

[0019] The beneficial effects of this improvement are: the bearing can withstand the radial and axial loads generated by the rotating shaft during rotation, while reducing the friction between the rotating shaft and the housing, reducing rotational resistance, and enabling the rotating shaft to rotate more flexibly and quickly after being subjected to the rotational force transmitted by the slide plate.

[0020] As an improvement, the central rod, guide shaft, and slide plate are sequentially fixedly connected along the axial direction of the housing to form an integral structure, and the rotating shaft and connecting rod are fixedly connected along the axial direction of the housing to form an integral structure.

[0021] The beneficial effect of this improvement is that this one-piece design makes force transmission more stable. In the process where the weighted rod drives the central rod, and then transmits the force sequentially to the guide shaft, the sliding plate, and the rotating shaft, which in turn transmits the rotational force to the connecting rod and the measuring tool, the one-piece structure avoids force transmission loss caused by loose or deformed connections between components, thus ensuring the mechanical performance of the entire device. Attached Figure Description

[0022] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0023] Figure 2 This is a schematic diagram of the cooperation between the power component and the rotating component in an embodiment of this utility model.

[0024] Figure 3 This is a cross-sectional view of the structure of an embodiment of the present utility model.

[0025] The reference numerals in the accompanying drawings include: housing 1, power component 2, rotating component 3, center rod 4, guide shaft 5, slide plate 6, rotating shaft 7, connecting rod 8, limiting groove 9, limiting protrusion 10, ball 11, ball seat 12, and track groove 13. Detailed Implementation

[0026] The following detailed description illustrates the specific implementation method:

[0027] Example

[0028] The basics are as follows: Figure 1 Appendix Figure 2 and attached Figure 3 As shown, a wireline well test rotary unblocking device includes a housing 1, a power component 2, and a rotating component 3. The power component 2 and the rotating component 3 are installed inside the housing 1. The power component 2 includes a central rod 4, a guide shaft 5, and a sliding plate 6. The rotating component 3 includes a rotating shaft 7 and a connecting rod 8.

[0029] The housing 1 is cylindrical. Inside the housing 1, along the axial direction, are sequentially arranged a sliding cavity for accommodating the guide shaft 5 and a rotating cavity for accommodating the rotating shaft 7. The center rod 4, guide shaft 5, and slide plate 6 are sequentially and integrally formed and fixedly connected along the axial direction of the housing 1. The sliding cavity and the rotating cavity are connected by a connecting cavity. The rotating shaft 7 and connecting rod 8 are integrally formed and fixedly connected along the axial direction of the housing 1. A first through hole is provided at the end of the housing 1 near the rotating cavity for the connecting rod 8 to pass through, and a second through hole is provided at the end of the housing 1 near the sliding cavity for the center rod 4 to pass through.

[0030] The center rod 4 has an upper connector at the end furthest from the guide shaft 5. The upper connector is located outside the housing 1 and is used to connect with the weight rod. The weight rod moves the center rod 4 axially as it falls. The connecting rod 8 has a lower connector at the end furthest from the rotating shaft 7. The lower connector is located outside the housing 1 and is used to connect with the measuring tool to transmit the axial rotational force of the rotating shaft to the measuring tool.

[0031] Both ends of the rotating shaft 7 are fixedly connected to the cavity and the first through hole by bearings, respectively, allowing the rotating shaft 7 to rotate axially within the rotating cavity. The axial length of the guide shaft 5 is less than the axial length of the sliding cavity, and the sliding plate 6 passes through the connecting cavity and fits against the rotating shaft 7. The sliding plate 6 is an arc-shaped plate that fits against the circumferential surface of the rotating shaft 7.

[0032] The rotating shaft 7 is provided with a track groove 13, which is an annular groove extending along the axial direction of the rotating shaft 7. The slide plate 6 is provided with a slider, which is located between the rotating shaft 7 and the slide plate 6, and is slidably installed in the track groove 13.

[0033] The sliding component includes a ball 11 and a ball seat 12. One end of the ball seat 12 is fixedly mounted on the slide plate 6, and the other end of the ball seat 12 is a concave spherical surface. The concave spherical surface of the ball seat 12 is in contact with the surface of the ball 11.

[0034] The inner wall of the housing 1 is provided with a limiting groove 9, the opening of which faces the rotating cavity. The limiting groove 9 is a straight groove extending along the axis of the housing 1. The sliding plate 6 is also provided with a limiting protrusion 10, which is located between the sliding plate 6 and the housing 1 and is slidably installed in the limiting groove. The limiting protrusion 10 slides along the limiting groove as the guide shaft 5 moves.

[0035] The specific implementation process is as follows:

[0036] During measurement, a measuring tool string is lowered into the well via a steel wire. From bottom to top, the measuring tool string consists of the measuring tool, a rotary release device, and a weight rod. When the measuring tool gets stuck, the weight rod moves up and down by raising and lowering the steel wire. The weight rod drives the central rod 4, guide shaft 5, and slide plate 6 to reciprocate. The slide plate 6 drives the ball bearings 11 to move along the track groove 13 of the rotating shaft 7, causing the rotating shaft 7 to rotate, thereby rotating the measuring tool and achieving rotary release.

[0037] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A wireline well testing rotary unblocking device, characterized in that: It includes a housing, a power component, and a rotating component. The housing is cylindrical, and a sliding cavity and a rotating cavity are arranged sequentially along the axial direction inside the housing. The sliding cavity and the rotating cavity are connected by a connecting cavity. A first through hole is provided on the end face of the housing near the rotating cavity, and a second through hole is provided on the end face of the housing near the sliding cavity. The power component includes a central rod, a guide shaft, and a sliding plate. The central rod, guide shaft, and sliding plate are fixedly connected in sequence along the axial direction of the housing. The central rod passes through the second through hole. The end of the central rod away from the guide shaft is provided with an upper connector located outside the housing for connecting with the weight rod. The guide shaft is slidably installed in the sliding cavity. The axial length of the guide shaft is less than the axial length of the sliding cavity. The rotating component includes a rotating shaft and a connecting rod, which are fixedly connected axially. The rotating shaft is rotatably installed in the rotating cavity, and the connecting rod passes through the first through hole. The end of the connecting rod away from the rotating shaft is provided with a lower connector located outside the housing for connection with a measuring tool. The sliding plate passes through the connecting cavity and fits against the rotating shaft. The rotating shaft is provided with a track groove, which is an annular groove extending axially along the rotating shaft. The sliding plate is provided with a sliding member, which is located between the rotating shaft and the sliding plate and is slidably installed in the track groove.

2. The wire rope well testing rotary unblocking device according to claim 1, characterized in that: The inner wall of the housing is provided with a limiting groove, the opening of the limiting groove faces the rotating cavity, and the limiting groove is a straight groove extending along the axial direction of the housing. The sliding plate is also provided with a limiting protrusion, which is located between the sliding plate and the housing and is slidably installed in the limiting groove.

3. The wire rope well testing rotary unblocking device according to claim 2, characterized in that: The slide plate is an arc-shaped plate that fits in circumferentially with the rotation axis.

4. The wire rope well testing rotary unblocking device according to claim 3, characterized in that: The sliding component includes a ball and a ball seat. One end of the ball seat is fixedly mounted on the slide plate, and the other end of the ball seat is a concave spherical surface. The concave spherical surface of the ball seat is in contact with the surface of the ball.

5. The wire rope well testing rotary release device according to claim 4, characterized in that: The two ends of the rotating shaft are respectively connected to the bearing mounting cavity and the first through hole.

6. The wire rope well testing rotary unblocking device according to claim 5, characterized in that: The central rod, guide shaft, and slide plate are sequentially fixedly connected along the axial direction of the housing to form an integral structure, and the rotating shaft and connecting rod are fixedly connected along the axial direction of the housing to form an integral structure.

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