Multi-connecting-rod pushing structure

Abstract

The invention discloses a multi-connecting-rod pushing structure, which belongs to the technical field of pushing instruments and comprises an instrument main body, a plurality of front arms are rotatably arranged on the instrument main body, and a plurality of front arm plate springs respectively connected with the corresponding front arms are arranged on the instrument main body; the sliding blocks are rotationally provided with rear arms, and pushing arms are connected between the front arms and the rear arms; one end of the rear arm plate spring is connected with the sliding block, and the other end is connected with the rear arm; the jam releasing mechanism and the connecting mechanism are arranged at the two ends of the pushing arm respectively; according to the scheme, when encountering extreme conditions such as well wall collapse or necking, the rear arm is firstly stressed to rotate, the pushing arm is driven to rotate under the action of the connecting mechanism and then acts on the front arm, and the front arm, the pushing arm and the rear arm can be integrally folded under the action of the unfreezing mechanism, so that dead points are removed, and the problem of difficulty in unfreezing is solved. The phenomenon that an existing pushing instrument is stuck when encountering extreme conditions is avoided, damage to an instrument main body is reduced, heavy losses are avoided, and high practicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of pushing instruments, and more specifically, to a multi-link pushing structure. Background Art

[0002] A multi-link pushing instrument generally refers to a logging device used in the petroleum and geological exploration industries. This device is mainly used for wellbore measurement. By moving the pushing instrument closely against the wellbore wall and collecting data. The pushing instrument can usually adapt to wellbores of different diameters, so as to ensure effective contact between the sensor and the wellbore wall, and is used to obtain formation parameter information. These parameters are of great significance for evaluating the properties of underground rocks, fluid types and distributions.

[0003] However, when the current multi-link pushing instrument is lifted in an oil well, if extreme situations such as wall collapse or necking occur, the pushing arms of the multi-link pushing instrument will be blocked and form dead points due to the decrease in the inner diameter of the wellbore wall, and it is necessary to use a large impact pulling force to get the pushing instrument out of trouble, which is extremely easy to cause damage to the pushing instrument and affect the use effect; and in many extreme situations, the pushing instrument will be stuck and cannot be pulled out of the oil well, which will cause heavy losses and high logging costs.

[0004] Therefore, it is necessary to provide a multi-link pushing structure to solve the above technical problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a multi-link pushing structure to solve the above technical problems.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multi-link pushing structure, comprising:

[0008] An instrument main body, on which a plurality of front arms are rotatably arranged, and a plurality of front arm leaf springs respectively connected to the corresponding front arms are arranged on the instrument main body;

[0009] A plurality of sliders are slidably arranged on the instrument main body, a rear arm is rotatably arranged on the slider, and a pushing arm is connected between the front arm and the rear arm;

[0010] A rear arm leaf spring, one end of which is connected to the slider and the other end is connected to the rear arm;

[0011] A stuck releasing mechanism and a connecting mechanism are respectively arranged at both ends of the pushing arm. With the cooperation of the rear arm, the stuck releasing mechanism and the connecting mechanism are respectively used to drive the pushing arm and the front arm to rotate.

[0012] Further, a front connecting piece connected to the front arm is arranged at one end of the pushing arm, and a rear connecting piece connected to the rear arm is arranged at the other end.

[0013] Furthermore, the connecting mechanism includes:

[0014] A rotation hole and a rear arm limiting waist-shaped circular hole are both formed on the rear arm, and a rear arm rotation hinge shaft and a rear arm limiting hinge shaft adapted to the rotation hole and the rear arm limiting waist-shaped circular hole respectively are arranged on the rear connecting piece;

[0015] The rear arm limiting hinge shaft is slidably connected with the rear arm limiting waist-shaped circular hole.

[0016] Furthermore, the stuck unlocking mechanism includes:

[0017] A stuck unlocking waist-shaped circular hole and a front arm limiting waist-shaped circular hole are both formed on the front arm;

[0018] A front arm rotation hinge shaft and a front arm limiting hinge shaft are both arranged on the front connecting piece and are respectively slidably adapted to the stuck unlocking waist-shaped circular hole and the front arm limiting waist-shaped circular hole;

[0019] A reset assembly is arranged on the front arm and is used for driving the front arm rotation hinge shaft to reset.

[0020] Furthermore, the reset assembly includes:

[0021] A reset hinge shaft sliding sleeve is movably sleeved outside the front arm rotation hinge shaft;

[0022] A reset leaf spring, one end of which is arranged on the front arm and the other end of which is connected with the reset hinge shaft sliding sleeve.

[0023] Furthermore, a plurality of sliding grooves are formed on the instrument main body, and the slider is slidably connected in the sliding grooves.

[0024] Furthermore, a limiting hole is formed in the sliding groove, and a limiting shaft slidably adapted to the limiting hole is arranged on the slider.

[0025] Furthermore, a front rotating shaft rotatably connected with the front arm is arranged on the instrument main body, and a rear rotating shaft rotatably connected with the rear arm is arranged on the slider.

[0026] Furthermore, cooperation holes are formed on both the front arm and the rear arm, and connecting shafts slidably adapted to the cooperation holes are arranged at the ends of the front arm leaf spring and the rear arm leaf spring.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] When the lifting device is lifted up in the well, if the well wall collapses or necks down, the rear arm of the instrument body will first hit the necked well wall. After the rear arm is subjected to force, one end of the rear arm will rotate around the slider, and the other end will drive the pushing arm to rotate under the action of the connecting mechanism, and finally the pushing arm and the rear arm will form a straight line. Then, the pushing arm and the rear arm will act on the front arm together, and then under the action of the unlocking mechanism, the front arm will be pressed to retract and rotate. During the continued lifting process, the pushing arm and the rear arm will move right with the slider (moving in the lifting direction), that is, the overall retraction of the forearm, the pushing arm and the rear arm is realized, the dead point is eliminated and the escape operation is realized, avoiding the phenomenon that the current pushing instrument will be stuck at the dead point when encountering well wall collapse or necking. It can greatly reduce the pulling force when the instrument body encounters well wall collapse or necking, better protect the instrument body, reduce damage to the instrument body, and improve its service life and use effect. It also greatly prevents the situation where the instrument body gets stuck and cannot be pulled out in the event of well wall collapse or necking, thus avoiding major losses, effectively reducing cost investment, and having high practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of the multi-link pushing structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of one set of connecting rods of the instrument body of the present invention working in a normal well wall;

[0031] Figure 3 for Figure 2 A in the figure shows the enlarged structural diagram;

[0032] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure of the main body of the instrument in the front view;

[0033] Figure 5 for Figure 4 A schematic diagram of the structure at point B in FIG.

[0034] Figure 6 for Figure 4 The enlarged structural diagram at C in FIG.

[0035] Figure 7 This is a schematic structural diagram of the apparatus of the present invention when the apparatus encounters a dead point on a constricted well wall;

[0036] Figure 8 for Figure 7 The enlarged structural diagram at D in FIG.

[0037] Figure 9 for Figure 7 Schematic diagram of the cross-sectional structure of the main body of the instrument in the front view;

[0038] Figure 10 is Figure 9 the enlarged structural schematic diagram at position E in

[0039] Figure 11 is the structural schematic diagram of the main body of this instrument of the present invention when entering the necked wellbore by releasing the stuck point.

[0040] Description of the reference numerals in the figure:

[0041] 1. Instrument main body; 2. Forearm; 3. Forearm leaf spring; 4. Slide block; 5. Rear arm; 6. Pushing arm; 7. Rear arm leaf spring; 8. Unsticking mechanism; 81. Unsticking waist circular hole; 82. Forearm limit waist circular hole; 83. Forearm rotation hinge shaft; 84. Forearm limit hinge shaft; 85. Reset assembly; 851. Reset hinge shaft sliding sleeve; 852. Reset leaf spring; 9. Connecting mechanism; 91. Rear arm limit waist circular hole; 92. Rear arm rotation hinge shaft; 93. Rear arm limit hinge shaft; 10. Front connecting piece; 11. Rear connecting piece; 12. Chute; 13. Restricting hole; 14. Restricting shaft; 15. Front rotating shaft; 16. Rear rotating shaft; 17. Matching hole; 18. Connecting shaft plate; 19. Normal wellbore; 20. Necked wellbore. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] Please refer to Figures 1 - 11 , a multi-link pushing structure, which is used to collect data on the normal wellbore 19 and can be unstuck when encountering the necked wellbore 20, that is, it can shrink into the necked wellbore 20 and continue to move, including:

[0044] The instrument main body 1, on which a plurality of forearms 2 are rotatably arranged, and a plurality of forearm leaf springs 3 respectively connected to the corresponding forearms 2 are arranged on the instrument main body 1;

[0045] A plurality of slide blocks 4, which are slidably arranged on the instrument main body 1, and a rear arm 5 is rotatably arranged on the slide block 4, and a pushing arm 6 is connected between the forearm 2 and the rear arm 5;

[0046] The rear arm leaf spring 7, one end of which is connected to the slide block 4 and the other end is connected to the rear arm 5;

[0047] The unsticking mechanism 8 and the connecting mechanism 9 are respectively arranged at both ends of the pushing arm 6, and with the cooperation of the rear arm 5, the unsticking mechanism 8 and the connecting mechanism 9 are respectively used to drive the pushing arm 6 and the forearm 2 to rotate.

[0048] In the accompanying drawings of the present application Figures 2 - 11 For the convenience of understanding and observation, only one set of multiple linkages is shown, that is, the states of a single front arm 2, a front arm leaf spring 3, a slider 4, a rear arm 5, a pushing arm 6, a rear arm leaf spring 7, etc. when working in the wellbore are shown. However, in actual operation, Figure 1 In this state, multiple sets of linkages on the instrument body 1 work in the wellbore simultaneously.

[0049] During use, when measuring the wellbore with the instrument body 1, the instrument body 1 is pulled by an external lifting device to move in the wellbore. The normal state of the instrument body 1 is to work on the normal wellbore 19. Since the front arm 2 is rotatably connected to the instrument body 1, the front arm leaf spring 3 on the instrument body 1 will apply an elastic force to the front arm 2 to support it; at the same time, the rear arm 5 is rotatably connected to the slider 4 on the instrument body 1, and the rear arm leaf spring 7 on the slider 4 will apply an elastic force to the rear arm 5 to support it. Thus, under the combined action of the front arm 2, the rear arm 5, and the slider 4, the pushing arm 6 is pressed against the wellbore, as Figure 2 and Figure 4 shown in the state. That is, when in the normal working state, the pushing arm 6 is pressed against the inner wall of the normal wellbore 19, and data is collected through the effective contact between the sensor and the wellbore, and finally the parameter information of the formation is obtained.

[0050] When the instrument body 1 is lifted in the well, that is Figure 2 lifting in the direction of the arrow in the figure. If extreme situations such as wellbore collapse or necking occur, that is, when encountering a necked wellbore 20, as Figure 7 and Figure 9 shown in the state, the rear arm 5 of the instrument body 1 first touches the necked wellbore 20. After that, when the instrument body 1 is continuously lifted, the rear arm 5 will be stressed and rotate. One end of the rear arm 5 will rotate around the slider 4, and the other end will drive the pushing arm 6 to rotate under the action of the connecting mechanism 9. Finally, the pushing arm 6 and the rear arm 5 form a straight line (similar to one arm), as Figure 7 and Figure 9The state shown. The push arm 6 and the rear arm 5 then work together to push the forearm 2, and the release mechanism 8 presses the forearm 2 to retract, causing the forearm to rotate. During the continued lifting process, the push arm 6 and the rear arm 5 move rightward (toward the lifting direction) along with the slider 4, thus achieving the overall retraction of the forearm 2, the push arm 6, and the rear arm 5, eliminating the dead point. Finally, the instrument body 1 smoothly enters the necked well wall 20 and continues to move and work, achieving the escape operation. This avoids the dead point and jamming phenomenon of current push-and-pull instruments when encountering well wall collapse or necking, greatly reducing the pulling force on the instrument body 1 when encountering well wall collapse or necking, better protecting the instrument body 1, reducing damage to the instrument body 1, and improving its service life and performance. Furthermore, it greatly prevents the instrument body 1 from getting stuck and unable to be pulled out in the event of well wall collapse or necking, thus avoiding significant losses, effectively reducing cost investment, and having high practicality.

[0051] Preferably, see Figures 2 - 5 and Figures 7 - 10 One end of the pushing arm 6 is provided with a front connecting piece 10 connected to the front arm 2, and the other end is provided with a rear connecting piece 11 connected to the rear arm 5.

[0052] Specifically, both ends of the pushing arm 6 are rotatably connected to the front arm 2 and the rear arm 5 through the front connecting member 10 and the rear connecting member 11 respectively, that is, the pushing arm 6 can rotate around the front arm 2 and the rear arm 5 respectively.

[0053] In this embodiment, preferably, please refer to 2-3 and Figures 7 - 8 , the connecting mechanism 9 includes:

[0054] The rotation hole and the rear arm limiting waist round hole 91 are both provided on the rear arm 5. The rear connecting member 11 is provided with a rear arm rotation hinge shaft 92 and a rear arm limiting hinge shaft 93 respectively adapted to the rotation hole and the rear arm limiting waist round hole 91;

[0055] The rear arm limiting hinge shaft 93 is slidably connected to the rear arm limiting waist circular hole 91 .

[0056] Specifically, in the working state, the state of the connecting mechanism 9 is as follows: Figures 2 - 3 As shown, the rear arm leaf spring 7 exerts elastic force on the rear arm 5, so that the rear arm 5 acts on the pushing arm 6 through the rear arm rotation hinge 92, and then cooperates with the front arm 2 and the unlocking mechanism 8 to make the pushing arm 6 close to the well wall.

[0057] When encountering the necking well wall 20, the state of the connecting mechanism 9 is as follows Figures 2 - 3As shown, the rear arm 5 will be stressed first and rotate. The rear arm 5 will drive one end of the pushing arm 6 to rotate around the rear arm 5 rotation hinge shaft 92 until the rear arm limit hinge shaft 93 is limited by the rear arm limit waist-shaped hole 91. At this time, the pushing arm 6 and the rear arm 5 form a straight line. Then, through the combined action of the pushing arm 6 and the rear arm 5 on the front arm 2, the front arm 2 is rotated and retracted.

[0058] Preferably, please refer to Figures 4 - 5 and Figures 9 - 10 , the pipe sticking release mechanism 8 includes:

[0059] The pipe sticking release waist-shaped hole 81 and the front arm limit waist-shaped hole 82 are both opened on the front arm 2;

[0060] The front arm rotation hinge shaft 83 and the front arm limit hinge shaft 84 are both arranged on the front connecting piece 10 and are respectively slidably matched with the pipe sticking release waist-shaped hole 81 and the front arm limit waist-shaped hole 82;

[0061] The reset assembly 85 is arranged on the front arm 2 and is used to drive the front arm rotation hinge shaft 83 to reset.

[0062] Specifically, in the working state, the state of the pipe sticking release mechanism 8 is as shown in Figures 4 - 5 . Through the elastic force of the front arm leaf spring 3 on the front arm 2, the front arm 2 acts on the pushing arm 6 through the front arm rotation hinge shaft 83, and then through the reset assembly 85, the front arm rotation hinge shaft 83 is reset to the working state, that is, the pushing arm 6 is made to closely adhere to the wellbore through the cooperation of the front arm 2.

[0063] When encountering the situation of a necked wellbore 20, the state of the pipe sticking release mechanism 8 is as shown in Figures 9 - 10 . When the pushing arm 6 and the rear arm 5 form a straight line, then the pushing arm 6 will act on the front arm 2 through the front arm rotation hinge shaft 83, so that the front arm rotation hinge shaft 83 slides in the pipe sticking release waist-shaped hole 81. When the front arm rotation hinge shaft 83 slides to the bottom position of the pipe sticking release waist-shaped hole 81, that is, in the pipe sticking release position, at this time, through the cooperation of the front arm limit hinge shaft 84, the front arm 2 rotates, and the front arm 2 will drive the pushing arm 6, the rear arm 5 and the slider 4 to move rightward (move in the pulling direction), and the pushing arm 6 will descend, that is, the overall retraction of the front arm 2, the pushing arm 6 and the rear arm 5 is realized, and the dead point can be released.

[0064] In this embodiment, preferably, please refer to Figures 4 - 5 and Figures 9 - 10 , the reset assembly 85 includes:

[0065] The reset hinge shaft sliding sleeve 851 is movably sleeved outside the front arm rotation hinge shaft 83;

[0066] The reset leaf spring 852 has one end arranged on the front arm 2 and the other end connected to the reset hinge shaft sliding sleeve 851.

[0067] With such a design, an elastic force is exerted on the reset hinge shaft sleeve 851 through the reset leaf spring 852, and the reset hinge shaft sleeve 851 will drive the forearm rotation hinge shaft 83 and the pushing arm 6 to move. The reset hinge shaft sleeve 851 can be reset to the working position through the reset leaf spring 852, that is, the forearm rotation hinge shaft 83 and the pushing arm 6 are reset to the working position.

[0068] In this embodiment, preferably, please refer to Figure 1 、 Figure 6 and Figure 9 , a plurality of sliding grooves 12 are formed in the instrument main body 1, and the slider 4 is slidably connected in the sliding grooves 12.

[0069] Specifically, the slider 4 will slide horizontally along the sliding groove 12. The slider 4 can be limited through the sliding groove 12. When the forearm 2, the pushing arm 6 and the rear arm 5 are integrally retracted, the slider 4 will slide along the sliding groove 12. When the instrument main body 1 gets out of trouble, the rear arm leaf spring 7 will drive the rear arm 5 to rotate and reset, and the slider 4 will also slide and reset.

[0070] In this embodiment, preferably, please refer to Figure 6 , a limiting hole 13 is formed in the sliding groove 12, and a limiting shaft 14 slidably adapted to the limiting hole 13 is provided on the slider 4.

[0071] With such a design, when the slider 4 slides, it will drive the limiting shaft 14 to move along the limiting hole 13. The limiting hole 13 can limit the limiting shaft 14 and the slider 4, improve the movement stability of the slider 4, and prevent the slider 4 from shifting, with good use effect.

[0072] In this embodiment, preferably, please refer to Figure 4 and Figure 6 , the instrument main body 1 is provided with a front rotating shaft 15 rotatably connected to the forearm 2, and the slider 4 is provided with a rear rotating shaft 16 rotatably connected to the rear arm 5.

[0073] With such a design, when the forearm 2 rotates, it will rotate around the front rotating shaft 15, and when the rear arm 5 rotates, it will rotate around the rear rotating shaft 16.

[0074] In this embodiment, preferably, please refer to Figures 4 - 5 , fitting holes 17 are formed in both the forearm 2 and the rear arm 5, and connecting shafts 18 slidably adapted to the fitting holes 17 are provided at the ends of the forearm leaf spring 3 and the rear arm leaf spring 7.

[0075] With such a design, the ends of the forearm leaf spring 3 and the rear arm leaf spring 7 can drive the connecting shaft 18 to slide along the fitting hole 17, so as to better exert an elastic force on the forearm 2 and the rear arm 5.

[0076] It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various modifications or changes based on it. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

[0077] It should be noted that if there are directional indications such as up, down, left, right, front, back... in the embodiments of the present invention, then such directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture as shown in the drawings. If the specific posture changes, then the directional indications will also change accordingly.

[0078] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, then such descriptions of "first", "second", etc. are only for descriptive purposes and should not be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, or scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, "a plurality of" means two or more. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A multi-link pushing structure, characterized in that, Comprising: An instrument main body (1) on which a plurality of front arms (2) are rotatably arranged, and a plurality of front arm leaf springs (3) respectively connected to the corresponding front arms (2) are arranged on the instrument main body (1); A plurality of sliders (4) slidably arranged on the instrument main body (1), a rear arm (5) is rotatably arranged on the slider (4), and a push arm (6) is connected between the front arm (2) and the rear arm (5); A rear arm leaf spring (7) having one end connected to the slider (4) and the other end connected to the rear arm (5); A pipe unclamping mechanism (8) and a connecting mechanism (9) respectively arranged at both ends of the push arm (6), and with the cooperation of the rear arm (5), the pipe unclamping mechanism (8) and the connecting mechanism (9) are respectively used to drive the push arm (6) and the front arm (2) to rotate.

2. The multi-link pushing and leaning structure according to claim 1, characterized in that, One end of the push arm (6) is provided with a front connecting member (10) connected to the front arm (2), and the other end is provided with a rear connecting member (11) connected to the rear arm (5).

3. The multi-link pushing and leaning structure according to claim 2, wherein, The connecting mechanism (9) includes: A rotation hole and a rear arm limit waist-shaped hole (91) both opened on the rear arm (5), and a rear arm rotation hinge shaft (92) and a rear arm limit hinge shaft (93) respectively adapted to the rotation hole and the rear arm limit waist-shaped hole (91) are arranged on the rear connecting member (11); The rear arm limit hinge shaft (93) is slidably connected to the rear arm limit waist-shaped hole (91).

4. A multi-link pushing structure according to claim 2, characterized in that, The pipe unclamping mechanism (8) includes: A pipe unclamping waist-shaped hole (81) and a front arm limit waist-shaped hole (82) both opened on the front arm (2); A front arm rotation hinge shaft (83) and a front arm limit hinge shaft (84) both arranged on the front connecting member (10) and respectively slidably adapted to the pipe unclamping waist-shaped hole (81) and the front arm limit waist-shaped hole (82); A reset assembly (85) arranged on the front arm (2) for driving the front arm rotation hinge shaft (83) to reset.

5. The multi-link pushing structure according to claim 4, characterized in that, The reset assembly (85) includes: A reset hinge shaft sliding sleeve (851) movably sleeved outside the front arm rotation hinge shaft (83); A reset leaf spring (852) having one end arranged on the front arm (2) and the other end connected to the reset hinge shaft sliding sleeve (851).

6. The multi-link pushing structure according to claim 1, wherein, A plurality of chutes (12) are opened on the instrument main body (1), and the slider (4) is slidably connected in the chute (12).

7. A multi-link pushing structure according to claim 6, characterized in that, A limit hole (13) is opened in the chute (12), and a limit shaft (14) slidably adapted to the limit hole (13) is arranged on the slider (4).

8. A multi-link pushing structure according to claim 6, characterized in that, A front rotating shaft (15) rotatably connected to the front arm (2) is arranged on the instrument main body (1), and a rear rotating shaft (16) rotatably connected to the rear arm (5) is arranged on the slider (4).

9. The multi-link pushing and leaning structure according to claim 4, wherein, Cooperating holes (17) are opened on both the front arm (2) and the rear arm (5), and connecting shafts (18) slidably adapted to the cooperating holes (17) are arranged at the ends of the front arm leaf spring (3) and the rear arm leaf spring (7).

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