CN109760100B - Joint mechanism and downhole tool detection device - Google Patents

Abstract

The invention relates to the technical field of natural gas and oil exploitation, and discloses a joint mechanism and an underground tool detection device. When the joint mechanism provided by the embodiment of the invention is used, the auxiliary swing arm can rotate reversely under the action of the downhole tool moving along the first direction or the second direction, so that the joint mechanism is suitable for detecting whether the downhole tool moving in the well reaches the position of the joint mechanism. According to the joint mechanism provided by the embodiment, when the contact part is impacted by the downhole tool, the main swing arm or/and the auxiliary swing arm rotate and give up a space for the downhole tool to pass through, so that the impact force applied to the joint mechanism can be greatly reduced, and the working reliability of the shutdown mechanism is high.

Description

Joint mechanism and downhole tool detection device

Technical Field

The invention relates to the technical field of natural gas and oil exploitation, in particular to a joint mechanism and an underground tool detection device.

Background

For a downhole tool working in a well of an oil or gas well (hereinafter referred to as oil or gas well), especially a downhole tool moving in the well under the force of gravity or fluid thrust, it is important to know whether the downhole tool reaches a certain preset position in the well.

However, there is currently a lack of reliable means for detecting whether the downhole tool has reached a certain preset position in the well. Currently, in most cases, the position of the downhole tool can only be determined empirically, which is less accurate. In some cases, it is also possible to indirectly calculate the position of the downhole tool in the well based on parameters such as fluid pressure in the well, friction between the downhole tool and the well, weight and time of the downhole tool, which also has the problem of low accuracy.

Disclosure of Invention

It is an object of the present invention to provide an articulation mechanism which can be activated effectively by a downhole tool and which is suitable for detecting whether the downhole tool has reached its position.

Another object of the present invention is to provide a downhole tool detection apparatus including the above-described joint mechanism.

The embodiment of the invention is realized by the following technical scheme:

an articulation mechanism comprising: a first shaft; a main swing arm having a bearing end and a swing end, the bearing end being connected to the first shaft in a manner capable of rotating in a forward or reverse direction; a second shaft connected to the swing end; a secondary swing arm having a connecting end and an activation end, the connecting end being connected to the second shaft in a manner capable of rotating in a forward or reverse direction; a main stopper configured to be restricted at a main standby position during a reverse rotation of the main swing arm; a sub-stopper portion configured to restrict the sub-swing arm at a sub-standby position during forward rotation thereof; a contact portion provided to the sub swing arm; and a return mechanism configured to impart a tendency to move the main swing arm to the main standby position and a tendency to move the sub swing arm to the sub standby position; wherein the swing sub-arm is configured to rotate in reverse when the contact portion is subjected to an external force in a first direction and maintain the swing main arm in the main standby position, and the swing sub-arm is configured to rotate in reverse when the contact portion is subjected to an external force in a second direction and drive the swing main arm to rotate in forward direction; the first direction and the second direction are opposite.

Further, a guide rail is arranged on the auxiliary swing arm, and the guide rail is configured to be matched with the auxiliary limiting part to force the auxiliary swing arm to rotate reversely when the contact part is subjected to the external force in the second direction.

Further, the secondary limiting portion is configured to be in rolling fit with the guide rail.

Further, the guide rail comprises an inner wall of a groove or a hole formed in the auxiliary swing arm.

Further, the contact portion is a runner connected to the swing sub-arm so as to be rotatable in a forward direction or a reverse direction.

Downhole tool detection apparatus comprising: any of the above-described joint mechanisms; the trigger is arranged at the trigger end; a base body provided with a receiving groove; and a detector disposed on the substrate; the joint mechanism is positioned in the accommodating groove, and the first shaft, the main limiting part and the auxiliary limiting part are fixedly connected with the base body; when the main swing arm is located at the main standby position and the auxiliary swing arm is located at the auxiliary standby position, the contact part is located outside the accommodating groove to bear the external force in the first direction or the second direction; the detector is configured to cooperate with the trigger during counter-rotation of the swing sub-arm.

Further, the downhole tool detection device further comprises a capturing part; the catching part is arranged in the base body in a reciprocating manner so as to be close to or far away from the auxiliary swing arm; the catching portion is configured to abut against the sub-swing arm or the contact portion to prevent the sub-swing arm from rotating reversely.

Furthermore, the base body is provided with an operation hole extending from the surface of the base body to the accommodating groove, and the rod-shaped catching part is matched with the operation hole in a reciprocating motion manner; the downhole tool detection device further includes an operating portion threadedly coupled to the operating bore, the operating portion configured to define a position of the catch portion.

Further, the operating portion and the catching portion are independent from each other, and the operating portion is configured to abut against an end of the catching portion away from the swing sub-arm.

Further, a shaft sealing mechanism is arranged between the catching part and the inner wall of the operation hole.

The technical scheme of the invention at least has the following advantages and beneficial effects:

when the joint mechanism provided by the embodiment of the invention is used, the auxiliary swing arm can rotate reversely under the action of the downhole tool moving along the first direction or the second direction, so that the joint mechanism is suitable for detecting whether the downhole tool moving in the well reaches the position of the joint mechanism. According to the joint mechanism provided by the embodiment, when the contact part is impacted by the downhole tool, the main swing arm or/and the auxiliary swing arm rotate and give up a space for the downhole tool to pass through, so that the impact force applied to the joint mechanism can be greatly reduced, and the working reliability of the shutdown mechanism is high.

The downhole tool detection device provided by the embodiment of the invention has the advantages or beneficial effects of the joint mechanism because the joint mechanism is provided.

Drawings

In order to more clearly illustrate the technical solution of the embodiment of the present invention, the drawings needed to be used in the embodiment are briefly described below. It is appreciated that the following drawings depict only certain embodiments of the invention and are therefore not to be considered limiting of its scope. From these figures, other figures can be derived by those skilled in the art without inventive effort.

Fig. 1 is a schematic perspective view of a joint mechanism provided in embodiment 1 of the present invention at a first viewing angle;

fig. 2 is a schematic perspective view of a joint mechanism provided in embodiment 1 of the present invention at a second viewing angle;

fig. 3 is a schematic structural view of a main swing arm in the joint mechanism provided in embodiment 1 of the present invention;

fig. 4 is a schematic plan structure view of a swing sub-arm in the joint mechanism provided in embodiment 1 of the present invention;

fig. 5 is a schematic perspective view of a swing sub-arm in the joint mechanism according to embodiment 1 of the present invention;

fig. 6 is a front view of the joint mechanism provided in embodiment 1 of the present invention, in which the main swing arm is located at the main standby position and the sub swing arm is located at the sub standby position;

FIG. 7 is a front view of the articulated mechanism provided in example 1 of the invention, wherein the main swing arm is in the main standby position and the sub swing arm is rotated in reverse by a certain angle under the action of the downhole tool moving in the first direction;

FIG. 8 is an elevation view of the articulated mechanism provided in example 1 of the present invention, with the main swing arm rotated in a forward direction by a certain angle and the auxiliary swing arm rotated in a reverse direction by a certain angle, under the action of a downhole tool moving in a second direction;

FIG. 9 is a rear view of the articulated mechanism provided in example 1 of the present invention, with the main swing arm rotated forwardly by a certain angle and the auxiliary swing arm rotated reversely by a certain angle under the action of the downhole tool moving in the second direction;

fig. 10 is a schematic perspective view of a downhole tool detection apparatus according to embodiment 2 of the present invention;

fig. 11 is a schematic cross-sectional view of a downhole tool detection apparatus according to embodiment 2 of the present invention;

FIG. 12 is a schematic structural view of an outer end of a base member in the inspection apparatus for a downhole tool according to example 2 of the present invention;

fig. 13 is a sectional view taken along line a-a of fig. 12.

In the figure: 01-a downhole tool detection device; 010-a joint mechanism; 020-downhole tool; 110-a first axis; 120-a second axis; 130-a main swing arm; 130 a-a limiting groove; 131-a support end; 131 a-a first axle hole; 132-a swing end; 132 a-second shaft hole; 140-swing sub-arms; 141-a connection end; 141 a-third shaft hole; 142-a trigger end; 143-a limiting hole; 144-a runner bore; 145-a receiving tank; 146-a guide rail; 150-a primary stop; 160-secondary limit part; 170-a reset mechanism; 180-a contact portion; 181-a runner hub; 200-a substrate; 200 a-an operation hole; 201-inner end; 201 a-a receiving slot; 202-outer end; 202 a-mounting holes; 210-a flip-flop; 220-a detector; 230-a mounting portion; 230 a-a communication aperture; 240-a capturing part; 250-an operating part; 260-shaft sealing mechanism; 261-a first stop collar; 262-a second stop collar; 263-sealing sleeve; 264-elastic sleeve; 265-a spring; 266-a contact ring; 267-metal ring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Thus, the following detailed description of the embodiments of the invention is not intended to limit the scope of the invention as claimed, but is merely representative of some embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the embodiments of the present invention and the features and technical solutions thereof may be combined with each other without conflict.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "positive", "negative", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, or orientations or positional relationships conventionally arranged in use of products of the present invention, or orientations or positional relationships conventionally understood by those skilled in the art, and such terms are used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the "natural gas well" may be a natural gas well for collecting conventional natural gas, and may also be a natural gas well for collecting unconventional natural gas (shale gas, coal bed gas, etc.).

In the description of the present invention, the forward direction is the direction a in the figure, the reverse direction is the direction B in the figure, the first direction is the direction U in the figure, and the second direction is the direction D in the figure.

Example 1:

the present embodiment provides an articulation mechanism 010. Fig. 1 is a schematic perspective view of the joint mechanism 010 according to this embodiment from a first perspective. Fig. 2 is a schematic perspective view of the joint mechanism 010 according to the embodiment from a second perspective.

Referring to fig. 1 and fig. 2, the joint mechanism 010 of the present embodiment includes a first shaft 110, a second shaft 120, a main swing arm 130, an auxiliary swing arm 140, a main limiting portion 150, an auxiliary limiting portion 160, a reset mechanism 170, and a contact portion 180.

Fig. 3 is a schematic structural diagram of the main swing arm 130 in the joint mechanism 010 according to this embodiment. Referring to fig. 1-3, the main swing arm 130 has opposite support ends 131 and swing ends 132. The supporting end 131 of the main swing arm 130 is opened with a first shaft hole 131a therethrough. The first shaft 110 rotatably penetrates the first shaft hole 131 a. In the joint mechanism 010 of the present embodiment, during use, the first shaft 110 is fixed, and the main swing arm 130 can rotate around the first shaft 110 in the forward direction or in the reverse direction. The swing end 132 of the main swing arm 130 is opened with a second shaft hole 132a therethrough. The axis of the second shaft hole 132a is substantially parallel to the first shaft hole 131 a. The second shaft 120 is substantially parallel to the first shaft 110, and one end of the second shaft 120 is inserted into the second shaft hole 132a and is fixedly connected to the main swing arm 130. A limit groove 130a is formed on an upper side surface of the main swing arm 130, and the limit groove 130a is used for accommodating the main limit portion 150. The main position-limiting portion 150 is a cylinder. In the joint mechanism 010 of this embodiment, one end of the main stopper 150 is fixed in use. In the process of the reverse rotation of the main swing arm 130, the other end of the main limiting portion 150 enters the limiting groove 130a and abuts against the wall of the limiting groove 130a, thereby preventing the main swing arm 130 from continuing to rotate in the reverse direction. At this time, the main swing arm 130 is located at the main standby position (the position shown in fig. 1 and 2). It should be noted that the shape and the position of the main limiting portion 150 are not limited to the above case, and in other embodiments, the main limiting portion 150 with other shapes may be adopted and placed at a position different from that shown in the figures, as long as it can limit the main swing arm 130 rotating in the reverse direction to the main standby position.

Fig. 4 is a schematic plan view of the swing sub-arm 140 in the joint mechanism 010 according to this embodiment. Referring to fig. 1-4, the auxiliary swing arm 140 has opposite connection end 141 and trigger end 142. The connecting end 141 of the sub swing arm 140 is opened with a third shaft hole 141a therethrough. One end of the second shaft 120 is rotatably inserted into the third shaft hole 141a so that the sub-swing arm 140 can rotate in the forward direction or the reverse direction about the second shaft 120. The sub-stopper 160 is a cylinder. In the joint mechanism 010 of this embodiment, the sub stopper portion 160 is fixed in use. In the process of forward rotation of the auxiliary swing arm 140, the auxiliary swing arm 140 abuts against the auxiliary limiting portion 160, and further forward rotation of the auxiliary swing arm 140 is prevented. At this time, the sub swing arm 140 is located at the sub standby position (the position shown in fig. 1 and 2). Specifically, in the present embodiment, the sub-swing arm 140 is provided with a stopper hole 143 penetrating in the thickness direction thereof. One end of the sub-stopper 160 extends into the stopper hole 143. In the process of forward rotation of the sub swing arm 140, the sub stopper 160 abuts against the wall of the stopper hole 143, thereby restricting the sub swing arm 140 at the sub standby position. It should be noted that the shape and the position of the sub stopper 160 are not limited to the above case, and in other embodiments, the sub stopper 160 having other shapes may be adopted and placed at a position different from that shown in the drawings, as long as it can limit the sub swing arm 140 rotating in the forward direction to the sub standby position.

The reset mechanism 170 is configured to impart a tendency for the main swing arm 130 to move to the main standby position and a tendency for the sub swing arm 140 to move to the sub standby position. For the above purpose, the reset mechanism 170 may be an elastic mechanism or a magnetic mechanism, and the reset mechanism 170 may also include two sub-reset mechanisms acting on the main swing arm 130 and the sub-swing arm 140, respectively. In the present embodiment, the reset mechanism 170 is an elastic mechanism, which only acts on the sub swing arm 140 to maintain the sub swing arm 140 at the sub standby position, and the sub swing arm 140 drives the main swing arm 130 to maintain at the main standby position through the second shaft 120. The return mechanism 170 is specifically a torsion spring. The reset mechanism 170 is disposed on the first shaft 110. In the use process of the joint mechanism 010 of this embodiment, one end of the restoring mechanism 170 is fixed, and the other end of the restoring mechanism 170 is slidably abutted against the swing sub-arm 140. The reset mechanism 170 is always in a compressed state, and applies an elastic reset force to the sub swing arm 140, so that the sub swing arm 140 can move to and be maintained at the sub standby position. The elastic reset force applied to the sub swing arm 140 by the reset mechanism 170 not only causes the sub swing arm 140 to rotate in the forward direction, but also drives the main swing arm 130 to rotate in the reverse direction through the sub swing arm 140 and the second shaft 120, so that the main swing arm 130 moves to and is maintained at the main standby position. Fig. 5 is a schematic perspective view of the sub swing arm 140 in the joint mechanism 010 according to this embodiment. Referring to fig. 5, in the present embodiment, in order to enable the end portion of the reset mechanism 170 to stably abut against the sub-swing arm 140, a receiving groove 145 is formed on a side surface of the sub-swing arm 140. The end of the restoring mechanism 170 is fitted into the receiving groove 145, so that the restoring mechanism 170 is more reliably contacted with the sub-swing arm 140.

The contact portion 180 is provided to the swing sub-arm 140. The contact portion 180 is to receive an external force in a first direction or a second direction. In particular, the contact portion 180 is adapted to contact a downhole tool 020 that is moved in a first direction or in a second direction. The contact portion 180 may be a part of the sub swing arm 140, and the contact portion 180 may also be a separate component connected to the sub swing arm 140. Since the contact portion 180 needs to be in contact with the downhole tool 020 moving in the first direction or in the second direction, in order to reduce the friction force at the time of contact, in the present embodiment, the contact portion 180 is a rotary wheel. The auxiliary swing arm 140 is provided with a runner hole 144. The rotary shaft 181 is parallel to the first shaft 110 and the second shaft 120, and one end of the rotary shaft 181 is inserted into the rotary hole 144 and fixed to the swing sub-arm 140. The contact portion 180 is supported on the rotary axle 181 in such a manner as to be rotatable in the forward or reverse direction. Further, in the present embodiment, the contact portion 180 is supported on the rotary shaft 181 via a bearing (not shown). Thus, when the contact portion 180 contacts the downhole tool 020 being moved in the first direction, the contact portion 180 rotates in the reverse direction, and when the contact portion 180 contacts the downhole tool 020 being moved in the second direction, the contact portion 180 rotates in the forward direction, reducing the frictional force. In addition, because the contact portion 180 can rotate, the contact portion 180 cannot jam the downhole tool 020 when the downhole tool 020 changes the moving direction in the process of contacting with the contact portion 180.

Fig. 6 is a front view of the joint mechanism 010 according to the present embodiment, in which the main swing arm 130 is located at the main standby position and the sub swing arm 140 is located at the sub standby position. Fig. 7 is a front view of the articulated mechanism 010 provided with the embodiment, wherein the main swing arm 130 is located at the main standby position, and the sub swing arm 140 is reversely rotated by a certain angle by the downhole tool 020 moved in the first direction. Fig. 8 is a front view of the joint mechanism 010 provided in the present embodiment, wherein the main swing arm 130 is rotated in a forward direction by a certain angle and the sub swing arm 140 is rotated in a reverse direction by a downhole tool 020 being moved in a second direction.

In the use process of the joint mechanism 010 according to this embodiment, as shown in fig. 6, when the contact portion 180 is not subjected to an external force, the main swing arm 130 is located at the main standby position and the sub swing arm 140 is located at the sub standby position by the reset mechanism 170. As shown in fig. 7, a downhole tool 020 being moved in a first direction impacts the contact portion 180 during movement, applying a force in the first direction to the contact portion 180. At this time, the main swing arm 130 is restricted to the main standby position by the main stopper 150 and cannot rotate reversely. The force in the first direction causes the swing sub-arm 140 to counter-rotate and the contact portion 180 moves with the swing sub-arm 140 to make room for the downhole tool 020 to pass through. During the counter-rotation of the sub swing arm 140, the passage or arrival of the trigger end 142 of the sub swing arm 140 at a certain set position can be detected. By detecting the trigger end 142, it can be determined whether the downhole tool 020 has reached the position of the articulation mechanism 010. As shown in fig. 8, the downhole tool 020 moving in the second direction impacts the contact portion 180 during movement, applying a force in the second direction to the contact portion 180. Under the force in the second direction, the sub-swing arm 140 rotates reversely while the main swing arm 130 rotates in the forward direction, and the contact portion 180 moves along with the sub-swing arm 140 to make room for the downhole tool 020 to pass through. During the counter-rotation of the sub swing arm 140, the passage or arrival of the trigger end 142 of the sub swing arm 140 at a certain set position can be detected. By detecting the trigger end 142, it can be determined whether the downhole tool 020 has reached the position of the articulation mechanism 010.

When the joint mechanism 010 provided by the present embodiment is used, the auxiliary swing arm 140 can rotate in the opposite direction no matter under the action of the downhole tool 020 moving in the first direction or the downhole tool 020 moving in the second direction, so that the joint mechanism 010 is suitable for detecting whether the downhole tool 020 moving in the hoistway reaches the position of the joint mechanism 010. In the joint mechanism 010 of the present embodiment, when the contact portion 180 is impacted by the downhole tool 020, the main swing arm 130 or/and the auxiliary swing arm 140 rotates to provide a space through which the downhole tool 020 passes, so that the impact force applied to the joint mechanism 010 can be greatly reduced, and the joint mechanism 010 has high operational reliability.

In rare cases, when the downhole tool 020 moving in the second direction collides with the contact portion 180 during the movement, the swing sub-arm 140 is rotated in the forward direction by the downhole tool 020, which may cause the joint mechanism 010 to be damaged. To avoid the positive rotation of the secondary swing arm 140 by the downhole tool 020 being moved in the second direction, a guide rail 146 is provided on the secondary swing arm 140. The guide rail 146 is configured to cooperate with the sub stopper portion 160 to force the sub swing arm 140 to rotate reversely when the contact portion 180 receives an external force in the second direction. Fig. 9 is a rear view of the joint mechanism 010 of the present embodiment, wherein the main swing arm 130 is rotated in a forward direction by a certain angle and the sub swing arm 140 is rotated in a reverse direction by a downhole tool 020 being moved in a second direction. In the present embodiment, one end wall surface of the stopper hole 143 constitutes the guide rail 146. When the contact portion 180 receives an external force in the second direction, the main swing arm 130 rotates forward, and the guide rail 146 contacts the sub-limit portion 160, so that the sub-swing arm 140 cannot rotate forward. Since the guide rail 146 has an arc shape, the sub-swing arm 140 is forced to rotate in the reverse direction by the engagement between the guide rail 146 and the sub-stopper 160 as the main swing arm 130 rotates in the forward direction. It should be noted that in other embodiments, the limiting hole 143 may be replaced by a groove formed on the swing sub-arm 140, and the guide rail 146 is a section of the inner wall of the groove formed on the swing sub-arm 140.

In order to reduce friction between the guide rail 146 and the secondary stopper portion 160, in the present embodiment, the secondary stopper portion 160 is configured to be in rolling engagement with the guide rail 146. Specifically, in the joint mechanism 010 of the present embodiment, when in use, the sub stopper 160 is fixed by a bearing or a needle roller, so that the sub stopper 160 can rotate around its own axis. The secondary limiting portion 160 is in rolling engagement with the guide rail 146 during the engagement of the guide rail 146 with the secondary limiting portion 160 to force the secondary swing arm 140 to reverse.

It should be noted that the joint mechanism 010 provided in this embodiment may be used for other occasions requiring arrival detection besides the detection of the downhole tool 020.

Example 2:

the present embodiment provides a downhole tool detection apparatus 01. Fig. 10 is a schematic perspective view of the downhole tool detection apparatus 01 according to this embodiment. The downhole tool detection device 01 includes the joint mechanism 010 described in embodiment 1. The downhole tool detection apparatus 01 further comprises a base 200. The base 200 is generally cylindrical in shape, having opposite inner and outer ends 201, 202. The inner end 201 of the base 200 is opened with a receiving groove 201 a. The base body 200 is used to be attached to a well of an oil and gas well, and the receiving groove 201a communicates with the well. The joint mechanism 010 is disposed in the housing groove 201 a. Fig. 11 is a schematic cross-sectional structure diagram of the downhole tool detection apparatus 01 according to the present embodiment. The first shaft 110, the primary constraining portion 150 and the secondary constraining portion 160 are all fixed on the base 200. The sub stopper 160 is supported by a bearing or a needle roller so as to be rotatable about its axis. As shown in fig. 10, when the main swing arm 130 is located at the main standby position and the sub swing arm 140 is located at the sub standby position, the contact portion 180 extends inward out of the receiving groove 201a into the hoistway to contact with a downhole tool 020 moving in the hoistway and receive a force in the first direction or the second direction. During the inversion of the secondary swing arm 140, the contact portion 180 moves with the secondary swing arm 140 and returns into the receiving groove 201a to make room for the downhole tool 020 to pass through.

The downhole tool sensing device 01 further includes a trigger 210 disposed at the initiation end 142, and a detector 220 disposed on the substrate 200. The detector 220 is configured to engage the trigger 210 during the reverse rotation of the sub-swing arm 140. The detector 220 and the trigger 210 may be implemented in various forms, for example, the detector 220 is a micro switch, and the trigger 210 contacts the detector 220 during the reverse rotation of the sub-swing arm 140 to implement the cooperation of the trigger 210 and the detector 220. In the present embodiment, the detector 220 is a magnetic proximity sensor, and the trigger 210 is a magnet. When the trigger 210 enters the detection range of the detector 220 during the inversion of the sub-swing arm 140, the detector 220 is triggered. The detector 220 is a magnetic proximity sensor, and the trigger 210 is a magnet, so that the trigger 210 can trigger the detector 220 without contacting the detector 220, so that the detector 220 can be arranged at a position not communicated with the accommodating groove 201a, and the condition that the fluid in the well contacts the detector 220 to cause the detector 220 to be in failure is avoided. Fig. 12 is a schematic structural diagram of an outer end 202 of a base 200 in the downhole tool detection apparatus 01 according to the present embodiment. Fig. 13 is a sectional view taken along line a-a of fig. 12. Referring to fig. 12 and 13, an outer end 202 of the base 200 is provided with a mounting hole 202a extending toward the inner end 201. The mounting hole 202a is a counter bore, the end of the mounting hole 202a extends to the side of the receiving groove 201a, and the mounting hole 202a is not communicated with the receiving groove 201 a. The downhole tool detection apparatus 01 provided in this embodiment further includes a mounting portion 230. The mounting portion 230 has a rod shape, and the mounting portion 230 is inserted into the mounting hole 202a and detachably engaged with the mounting hole 202 a. The detector 220 is fixed to the mounting portion 230 and enters the end of the mounting hole 202a along with the mounting portion 230. Thereby, the detector 220 is fixed to the side surface of the housing groove 201 a. In this way, the detector 220 is able to effectively detect the trigger 210 and is not affected by the fluid in the well. Further, the mounting portion 230 may be opened with a communication hole 230 a. The communication hole 230a extends outward from the position where the detector 220 is installed until it communicates with the outside, which facilitates the arrangement of the communication cable of the detector 220.

The downhole tool detection apparatus 01 provided in the present embodiment further includes a capturing portion 240. The catching portion 240 is disposed in the base 200 in a reciprocating manner to be close to or distant from the swing sub-arm 140. The catching portion 240 is configured to abut against the sub swing arm 140 or the contact portion 180 to prevent the sub swing arm 140 from reversely rotating. When the trigger 210 is detected by the detector 220, it indicates that the downhole tool 020 has reached the position of the downhole tool detection device 01, and the contact portion 180 abuts against the downhole tool 020. At this time, if the catching portion 240 abuts against the sub swing arm 140 or the contact portion 180, the sub swing arm 140 is prevented from rotating reversely, so that the contact portion 180 always abuts against the downhole tool 020, the downhole tool 020 cannot move continuously, and the catching of the downhole tool 020 is completed. When the downhole tool 020 needs to be released, the catching part 240 is far away from the swing sub-arm 140, the swing sub-arm 140 can be reversed, and the contact part 180 moves along with the swing sub-arm 140 and returns to the accommodating groove 201a, so that a space for the downhole tool 020 to pass through is reserved.

The catching part 240 may be driven by various means, such as a motor, a hydraulic cylinder, or a pneumatic cylinder, which drives the catching part 240 to reciprocate. In the present embodiment, the position of the catching part 240 is defined by the operating part 250. Specifically, the base 200 is provided with an operation hole 200a, and the operation hole 200a extends from the surface of the outer end 202 of the base 200a toward the inner end 201 until communicating with the receiving groove 201 a. The rod-shaped catching portion 240 is fitted in the operation hole 200a in a reciprocating manner. The operation portion 250 is screwed to the operation hole 200 a. By rotating the operation portion 250, the operation portion 250 can be moved inward or outward along the operation hole 200a, thereby restricting the position of the catching portion 240. The operating part 250 may be integral with the capturing part 240. In the present embodiment, the operation unit 250 and the capturing unit 240 are independent from each other, and the capturing unit 240 tends to move outward by the pressure fluid in the hoistway. By adjusting the position of the operating portion 250, the operating portion 250 is abutted against one end of the catching portion 240 away from the swing sub-arm 140 to push the catching portion 240 to move inward or to limit the position of the catching portion 240. Thus, the rotation of the catching part 240 can be prevented, so that the catching part 240 and the operation hole 200a can be well sealed.

Further, in the present embodiment, a shaft sealing mechanism 260 is provided between the catching portion 240 and the inner wall of the operation hole 200a, so that a good dynamic seal is formed between the catching portion 240 and the inner wall of the operation hole 200 a. The shaft seal mechanism 260 includes a first retaining ring 261 and a second retaining ring 262 that project radially inward from the inner wall of the operation hole 200 a. The first and second retainer rings 261 and 262 are each slidably penetrated by the capture portion 240. The shaft sealing mechanism 260 further includes a sealing sleeve 263, an elastic sleeve 264, and a spring 265 disposed between the first retaining ring 261 and the second retaining ring 262. The sealing sleeve 263 is sleeved on the catching part 240, and one end of the sealing sleeve 263 close to the first limit ring 261 protrudes radially outwards to form a contact ring 266. The elastic sleeve 264 is sleeved on the sealing sleeve 263. The spring 265 is sleeved on the catching portion 240, one end of the spring 265 abuts against the second limit ring 262, and the other end of the spring 265 acts on the end of the elastic sleeve 264. The spring 265 is always in a compressed state, and the spring 265 applies an elastic force in the axial direction to the elastic sleeve 264, so that the elastic sleeve 264 drives the sealing sleeve 263 to move towards the first limit ring 261, and finally the contact ring 266 is tightly attached to the first limit ring 261 to form a seal. Under the action of the axial force exerted by spring 265, elastic sleeve 264 is deformed in the radial direction so that the outer peripheral surface of elastic sleeve 264 abuts against the inner wall of operation hole 200a, while the inner peripheral surface of elastic sleeve 264 abuts against the outer peripheral surface of sealing boot 263 and exerts a radially inward pressure on sealing boot 263. The radially inward pressure exerted by the elastomeric sleeve 264 on the sealing boot 263 allows the inner circumferential surface of the sealing boot 263 to abut against the outer circumferential surface of the trap 240. The above-described structure realizes sealing between the outer circumferential surface of the elastic sleeve 264 and the inner wall of the operation hole 200a, between the inner circumferential surface of the elastic sleeve 264 and the sealing sleeve 263, and between the inner circumferential surface of the sealing sleeve 263 and the trap part 240. In this way, the catching portion 240 and the inner wall of the operation hole 200a are sealed, and the downhole tool detecting device 01 is prevented from leaking.

Further, in the present embodiment, the elastic sheath 264 is made of rubber. Further, the elastic sheath 264 includes a plurality of rubber rings that are independent of each other and are arranged side by side. The plurality of rubber rings are pressed against each other by the axial force applied by the spring 265. Under the action of the axial force exerted by the spring 265, each rubber ring independently generates radial deformation, so that the sealing sleeve 263 can be ensured to axially bear uniform radial pressure everywhere, and the sealing performance between the sealing sleeve 263 and the catching part 240 is further improved.

Further, sealing boot 263 may be made of teflon or nylon, and in this embodiment, sealing boot 263 is made of teflon.

Further, in the present embodiment, the shaft sealing mechanism 260 further includes a metal ring 267 disposed between the elastic sleeve 264 and the spring 265; a ferrule 267 is disposed on sealing sleeve 263. The spring force of spring 265 acts on elastic sleeve 264 via metal ring 267 such that elastic sleeve 264 is subjected to a more uniform axial force, which helps to increase the service life of elastic sleeve 264.

In the downhole tool detection device 01 provided in this embodiment, the outer circumferential surface of the base body 200 is provided with external threads, and the base body 200 is screwed to the oil gas well and is connected to the well. When the downhole tool 020 has not reached the position of the downhole tool detecting device 01, the main swing arm 130 is maintained at the main standby position and the auxiliary swing arm 140 is maintained at the auxiliary standby position (as shown in fig. 6) by the reset mechanism 170. At this time, the contact portion 180 protrudes inward into the hoistway. When the downhole tool 020 moving in the first direction moves to the position of the downhole tool detection device 01, the downhole tool 020 collides with the contact part 180, the main swing arm 130 is maintained at the main standby position under the action of the main limiting part 150, the auxiliary swing arm 140 rotates in the opposite direction, the contact part 180 is driven to move outwards to make room for the downhole tool 020 to pass through (as shown in fig. 7), and the trigger 210 on the trigger end 142 is detected by the detector 220. When the downhole tool 020 moving in the second direction moves to the position of the downhole tool detection device 01, the downhole tool 020 collides with the contact part 180, the main swing arm 130 rotates in the forward direction to drive the auxiliary swing arm 140 to move, the auxiliary swing arm 140 is forced to rotate reversely under the combined action of the guide rail 146 and the auxiliary limiting part 160, the contact part 180 is driven to move outwards to make a space for the downhole tool 020 to pass through (as shown in fig. 8), and the trigger 210 on the trigger end 142 is detected by the detector 220.

When the downhole tool detection device 01 provided by the embodiment is used, the auxiliary swing arm 140 can rotate in the opposite direction no matter under the action of the downhole tool 020 moving in the first direction or the downhole tool 020 moving in the second direction, so that the joint mechanism 010 is suitable for detecting whether the downhole tool 020 moving in the well reaches the position of the joint mechanism 010. According to the downhole tool detection device 01 provided by the embodiment, when the contact part 180 is impacted by the downhole tool 020, the main swing arm 130 or/and the auxiliary swing arm 140 rotates to make room for the downhole tool 020 to pass through, so that the impact force applied to the joint mechanism 010 can be greatly reduced, and the downhole tool detection device 01 is high in working reliability.

The above description is only a partial example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. An articulation mechanism, comprising:

a first shaft;

a main swing arm having a bearing end and a swing end, the bearing end being connected to the first shaft in a manner capable of rotating in a forward or reverse direction;

a second shaft connected to the swing end;

a secondary swing arm having a connecting end and an activation end, the connecting end being connected to the second shaft in a manner capable of rotating in a forward or reverse direction;

a main stopper configured to be restricted at a main standby position during a reverse rotation of the main swing arm;

a sub-stopper portion configured to restrict the sub-swing arm at a sub-standby position during forward rotation thereof;

a contact portion provided to the sub swing arm; and

a return mechanism configured to impart a tendency to move the main swing arm to the main standby position and a tendency to move the sub swing arm to the sub standby position;

wherein the swing sub-arm is configured to rotate in reverse when the contact portion is subjected to an external force in a first direction and maintain the swing main arm in the main standby position, and the swing sub-arm is configured to rotate in reverse when the contact portion is subjected to an external force in a second direction and drive the swing main arm to rotate in forward direction; the first direction and the second direction are opposite; the auxiliary swing arm is provided with a guide rail which is configured to be matched with the auxiliary limiting part to force the auxiliary swing arm to rotate reversely when the contact part is subjected to the external force of the second direction.

2. The joint mechanism according to claim 1, wherein:

the secondary restraint portion is configured to be in rolling engagement with the guide rail.

3. The joint mechanism according to claim 1, wherein:

the guide rail comprises the inner wall of a groove or a hole formed in the auxiliary swing arm.

4. The joint mechanism according to claim 1, wherein:

the contact portion is a runner connected to the swing sub-arm so as to be rotatable in a forward direction or a reverse direction.

5. Downhole tool detection apparatus, comprising:

the joint mechanism of any one of claims 1-4;

the trigger is arranged at the trigger end;

a base body provided with a receiving groove; and

a detector disposed on the substrate;

the joint mechanism is positioned in the accommodating groove, and the first shaft, the main limiting part and the auxiliary limiting part are fixedly connected with the base body; when the main swing arm is located at the main standby position and the auxiliary swing arm is located at the auxiliary standby position, the contact part is located outside the accommodating groove to bear the external force in the first direction or the second direction; the detector is configured to cooperate with the trigger during counter-rotation of the swing sub-arm.

6. The downhole tool detection apparatus of claim 5, wherein:

the downhole tool detection device further comprises a capturing part; the catching part is arranged in the base body in a reciprocating manner so as to be close to or far away from the auxiliary swing arm; the catching portion is configured to abut against the sub-swing arm or the contact portion to prevent the sub-swing arm from rotating reversely.

7. The downhole tool detection apparatus of claim 6, wherein:

the base body is provided with an operation hole extending from the surface of the base body to the accommodating groove, and the rod-shaped catching part is matched with the operation hole in a reciprocating motion manner;

the downhole tool detection device further includes an operating portion threadedly coupled to the operating bore, the operating portion configured to define a position of the catch portion.

8. The downhole tool detection apparatus of claim 7, wherein:

the operation portion and the catching portion are independent from each other, and the operation portion is configured to abut against an end of the catching portion away from the swing sub-arm.

9. The downhole tool detection apparatus of claim 7, wherein:

a shaft sealing mechanism is arranged between the catching part and the inner wall of the operation hole.

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