Multi-stage vibrating device capable of being salvaged

Abstract

The utility model relates to the technical field of oscillation jam releasing tools, in particular to a salvageable multi-stage vibration device, which comprises a plurality of stages of vibrators connected end to end, each vibrator comprises an upper joint connected to the top end of a main body, an outer pipe capable of moving up and down is arranged outside the main body, a sliding block is arranged at the bottom end of the main body, and two ends of the sliding block extend into a movable groove of the outer pipe. An umbrella-shaped fish top center rod with a fish top at the top end is arranged in the body, and a stop piece is arranged at the bottom end of the center rod and embedded into the movable groove to fix the position of the body. According to the salvageable multi-stage vibration device provided by the utility model, multiple vibration can be carried out in one vibration stroke through the multiple stages of vibrators which are connected end to end, so that the vibration frequency and the vibration strength are improved; when the first-stage jar is stuck, the other jetters can work normally, and the stuck jetters are released by utilizing the jettering force; and the device can be directly fished through a fishing tool through the fish top, the practicability of the device is improved, and the work difficulty of fishing work is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of oscillation pipe releasing tools, in particular to a retrievable multi-stage shock device. Background Art

[0002] During the process of layered testing and deployment, an oscillator must be used to perform oscillation pipe releasing on downhole equipment, so as to reduce the occurrence probability of pipe dropping accidents. In the prior art, due to the limitation of its own structure, the existing shock device can only perform one shock per stroke during the working process, and the generated shock force and shock frequency are low, resulting in low working efficiency of the device; at the same time, during the repeated working process, impurities such as sand and oil stains in the well are extremely easy to adhere to the shock device, resulting in the jamming of the shock device and causing downhole falling objects. At this time, a fishing operation is required to retrieve the falling objects; when the sticking of the downhole shocker is serious, multiple sets of fishing tools need to be lowered into the well to release the stuck, which not only makes the operation inconvenient but also reduces the working efficiency; after a long time of shock work in the well, the connection position at the top of the shock device will be corroded and worn after frequent use, resulting in the detachment of the connector. After detachment, the remaining device cannot be retrieved due to the obstruction of the central rod and can only be processed by other operation methods, resulting in increased working difficulty and workload. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a retrievable multi-stage shock device to overcome the defects of low shock intensity and frequency, easy jamming of the device, and great difficulty in fishing when detachment occurs due to long-term work in the prior art.

[0004] To achieve the above purpose, the utility model provides a retrievable multi-stage shock device, including:

[0005] Multi-stage shockers connected end to end. Each shocker includes an upper joint and a main body, and the main body is connected below the upper joint; an outer pipe is provided outside the main body, and a lower joint is provided at the bottom end of the outer pipe; in two adjacent upper and lower shockers, the lower joint of the upper shocker is connected to the upper joint of the lower shocker; a slider is provided at the bottom end of the main body, and two vertically oriented movable grooves are provided on the outer pipe. The two movable grooves correspond to the left and right ends of the slider respectively, and the left and right ends of the slider each extend into a movable groove; a fish top is provided at the top end of the central rod of the umbrella-shaped fish top of the main body; a fixed groove corresponding to the position of the movable groove is provided on the side wall of the main body; a retaining piece is provided at the bottom end of the central rod, and the bottom end of the retaining piece is connected to the central rod and can rotate around the connection point towards the fixed groove; the top end of the retaining piece is provided with outwardly protruding teeth, and the teeth are screwed into the movable groove through the fixed groove. The upper surface of the teeth is an inclined surface facing downwards; the bottom end of the retaining piece is connected to the central rod through a retaining pin, and a retaining spring is provided between the top end of the retaining piece and the central rod.

[0006] Preferably, the number of the shockers is two.

[0007] Preferably, the connection between the upper joint and the main body is detachable.

[0008] Preferably, the fish head is a multi-stage umbrella-shaped stepped structure.

[0009] Preferably, a circumferentially protruding boss is provided on the central rod of the umbrella-shaped fish head, and a compression spring is provided between the boss and the bottom end of the upper joint.

[0010] Preferably, the lower surface of the locking teeth is an inclined surface that shrinks downward.

[0011] Preferably, a spring groove is provided at the top end of the stop piece, and the direction of the spring groove is opposite to that of the movable groove; an installation groove corresponding to the position of the spring groove is provided on the central rod, and one end of the stop spring is located in the spring groove and the other end is located in the installation groove.

[0012] The retrievable multi-stage shock device provided by the present utility model has the following beneficial effects:

[0013] The retrievable multi-stage shock device provided by the present utility model can perform multiple shocks in one shock stroke through multiple shockers connected end to end, improving the shock frequency and shock intensity; at the same time, when sundries fall into the shocker and jam the first-stage shocker, the remaining shockers can still work normally and use the shock force to unjam the jammed shocker during the shock process; by providing a fish head at the top of the central rod of the umbrella-shaped fish head, when the joint of the shocker falls off, the device can be directly retrieved by a retrieval tool, improving the practicability of the device and reducing the working difficulty of the retrieval work. Description of the Drawings

[0014] Figure 1 It is a structural diagram of a retrievable multi-stage shock device;

[0015] Figure 2 It is a mechanism diagram of the shocker inside the retrievable multi-stage shock device.

[0016] Legend Explanation:

[0017] 1. Upper joint; 2. Central rod of umbrella-shaped fish head; 3. Compression spring; 4. Stop piece; 5. Stop pin; 6. Slide block; 7. Lower joint; 8. Main body; 9. Outer tube. Detailed Embodiment

[0018] 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. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1:

[0020] As Figure 1-2 shown, a retrievable multi-stage shock device provided by the present invention includes: multi-stage shockers connected end to end. After the multi-stage shockers are connected end to end, during the shock operation in the well, multiple shock operations can be performed in one shock stroke, thereby increasing the shock frequency, shortening the number of shock strokes in the shock sticking operation, and shortening the working time. Each shocker includes an upper sub 1 and a body 8. The body 8 is connected below the upper sub 1. An outer tube 9 is provided outside the body 8. A lower sub 7 is provided at the bottom end of the outer tube 9. The upper sub 1 and the lower sub 7 are respectively used to connect to other downhole tools above or below. During the working process, after determining the number of shockers, the multiple shockers are arranged in sequence from top to bottom. Among two adjacent shockers, the upper sub 1 of the lower shocker is connected to the lower sub 7 of the upper shocker. The upper sub 1 of the topmost shocker is connected upward to the pipe string, and the lower sub 7 of the lowermost shocker is connected to other downhole tools below. Both the body 8 and the outer tube 9 are tubular. The outer tube 9 can move up and down along the body 8 outside the body 8.

[0021] A slider 6 is provided at the bottom end of the body 8. The slider 6 is fixed at the bottom end of the body 8 and moves with the body 8. Two vertically oriented movable slots are provided on the outer tube 9. The two movable slots correspond to the left and right ends of the slider 6 respectively. The left and right ends of the slider 6 each extend into a movable slot. After the slider 6 extends into the movable slot, when the outer tube 9 moves up and down along the body 8 on the body 8, since the slider 6 extends into the movable slot, the position of the slider 6 in the movable slot also changes accordingly when the outer tube 9 moves up and down. When the slider 6 contacts the upper and lower ends of the movable slot, the slider 6 will collide with the inner wall of the movable slot to prevent the outer tube 9 from continuing to move, playing a limiting role on the outer tube 9 and preventing the outer tube 9 from separating from the body 8.

[0022] Meanwhile, during the working process, after the working string lowered into the well gets stuck underground, the position of the outer pipe 9 is fixed. When the main body 8 is quickly pulled upward, the slider 6 will also move upward rapidly with the main body 8. When the slider 6 contacts the upper edge of the movable groove, the movable groove will also fix the position of the slider 6 to prevent the slider 6 from continuing to move upward. During this process, the slider 6 will quickly rise with the main body 8 and collide with the top of the sliding groove. The slider 6 collides violently with the movable groove to generate a shock. The force of the shock will be transmitted to the pipe string to oscillate the entire working string lowered into the well. After restoring the position of the main body 8 after one shock, repeating the process of quickly pulling up and resetting the main body 8 can continuously shock the pipe string underground, and the pipe string will gradually become unstuck under continuous shocks. In this shock device, after multiple shockers are connected end to end, lifting the main body 8 of the uppermost shocker can simultaneously lift the main body 8 of each shocker. Each slider 6 moving upward with the main body 8 will collide to generate a shock when contacting the movable groove on the outer pipe 9 and transmit the shock force to the pipe string for the unsticking work. Thus, during one stroke, the pipe string can be shocked multiple times, increasing the shock frequency of the device. And the total value of the shock force acting on the pipe string is the sum of the magnitudes of the shock forces generated by each shocker during the working process, thereby increasing the shock intensity of the shock device while increasing the shock frequency.

[0023] During the working process, if only the main body 8 is quickly lifted by the driving device on the wellhead to make the slider 6 collide with the outer pipe 9 to generate a shock, the performance requirements for the driving device are too high. It is required that the driving device can instantaneously provide a large pulling force to lift the main body 8, and the performance of the commonly used driving devices in the unsticking work cannot achieve a good unsticking effect. Therefore, an umbrella-shaped fish head center rod 2 and a stop piece 4 are provided in the shocker. The center rod 2 and the stop piece 4 cooperate to temporarily fix the position of the main body 8. When the upward pulling force on the main body 8 reaches a certain level, the center rod 2 and the stop piece 4 release the fixation of the position of the main body 8. At this time, the main body 8 quickly drives the slider 6 to move upward under the action of a higher upward pulling force, causing the slider 6 to collide with the outer pipe 9 and generate a shock force that meets the working requirements, thereby improving the unsticking work efficiency of the device.

[0024] The umbrella-shaped fish head center rod 2 is located inside the main body 8. There is a fixed groove on the side wall of the main body 8, and the position of the fixed groove corresponds to that of the movable groove. The stop piece 4 is installed on the center rod 2. The bottom end of the stop piece 4 is connected to the bottom end of the center rod 2 and can rotate around the connection point towards the fixed groove. By screwing the stop piece 4 out of the fixed groove and into the movable groove, when the main body 8 is pulled upward by force, the top end of the stop piece 4 will contact the top end of the movable groove. At this time, the stop piece 4 contacts the outer pipe 9 to fix the position of the main body 8, so that the main body 8 will not move when the driving device just starts to apply an upward pulling force. The upward pulling force on the main body 8 will gradually increase with the action of the driving device, playing a role in energy storage.

[0025] To ensure that when the tensile force on the main body 8 after energy storage can generate a shock intensity sufficient to meet the strength requirements for stuck pipe releasing work, the stop piece 4 is provided with outwardly protruding teeth. After the stop piece 4 rotates, the teeth are screwed into the movable groove through the fixed groove. The upper surface of the teeth is an inclined surface facing downward. When the teeth fix the position of the main body 8, the upper surface of the teeth receives a downward pressure applied by the outer pipe. At this time, due to the upper surface being an inclined surface facing downward, a part of the force is decomposed into a force that pushes the teeth inward. When the component force pushing the teeth inward is large enough to push the teeth into the main body 8, the teeth rotate inward under the force and enter the main body 8. At this time, the force acting on the main body 8 is instantly released, driving the main body 8 and the slider 6 to move upward and collide violently with the outer pipe 9 to generate a shock. By adjusting the inclination angle of the upper surface of the teeth, the magnitude of the force required for the teeth to retract into the main body 8 can be changed accordingly, thereby changing the magnitude of the shock force generated during the shock work.

[0026] Among them, the connection between the upper sub 1 and the main body 8 is detachable. After removing the upper sub 1, the components of the main body 8 can be directly taken out for maintenance and replacement, reducing the time and work input for device maintenance. The connection between the upper sub 1 and the main body 8 generally adopts a threaded connection, with low disassembly and assembly difficulty. However, during the long-term shock work underground, the connection between the upper sub 1 and the main body 8 is prone to breakage, damage, etc. due to frequent stress, resulting in the separation of the upper sub 1 and the main body 8. At this time, only the upper sub 1 is still connected to the pipe string, and the main body 8 and the components below fall into the well. To improve the work efficiency and success rate of salvaging the main body 8, the top of the umbrella-shaped fish top center rod 2 is provided with a fish top. The fish top can cooperate with existing downhole fishing tools. In the fishing work for the part of the main body 8 that has fallen into the well, only by lowering a set of fishing tools can it cooperate with the fish top at the top of the umbrella-shaped fish top center rod 2 to salvage the main body 8 and other components below, greatly reducing the work difficulty in the fishing work after the separation of the upper sub 1 and the main body 8 and improving the work efficiency of the fishing work.

[0027] The fish top is generally a stepped shape with multiple umbrella-shaped protrusions arranged in a stacked manner, and the fishing tool can directly grab the fish top during the fishing process.

[0028] In the present utility model, the umbrella-shaped fish top center rod 2 is provided with a circumferentially protruding boss, and a compression spring 3 is provided between the boss and the bottom end of the upper sub 1. When the main body 8 is forced upward, since the bottom end of the stop piece 4 is connected to the center rod 2, at this time, the upper sub 1 and the main body 8 will gradually move upward. At this time, the position of the center rod 2 remains unchanged, and the compression spring 3 is compressed by the pressure from the center rod 2 and the bottom end of the upper sub 1. After the main body 8 collides with the outer pipe 9 to generate a shock, the center rod 2 and the main body 8 need to be reset before the shock can be carried out again. At this time, the compression spring 3 pushes the center rod 2 back to its original position under the action of its own gravity, assisting the device to reset and improving the work efficiency of the device.

[0029] Wherein, the bottom end of the stop piece 4 is connected to the central rod 2 through a stop pin 5. The stop piece 4 can rotate around the stop pin 5 on the central tube 2 and extend into the movable groove. A stop spring is provided between the top end of the stop piece 4 and the central rod 2. After being squeezed between the stop piece 4 and the central rod 2, the stop spring pushes the stop piece 4 outwards, thereby increasing the pressure that the stop piece 4 can withstand when retracting into the main body 8 during the shock work, increasing the pulling force from the upper driving device accumulated by the main body 8 during the shock work, and increasing the magnitude of the shock force generated by the device during the shock work. At the same time, after the shock work, the main body 8 needs to be reset to perform the next shock work. After the main body 8 is pushed downwards by the driving device on the wellhead, when the positions of the fixed groove and the movable groove coincide, the teeth of the stop piece 4 need to rotate again and the teeth fall into the movable groove to fix the position of the main body 8. At this time, under the action of its own elasticity, the stop spring pushes the teeth of the stop piece 4 back into the movable groove to achieve synchronous reset of the teeth.

[0030] It should be noted that the lower surface of the tooth is an inclined surface that contracts downwards to ensure that the device can be smoothly reset after each shock stroke. After the stop piece 4 moves upwards with the main body 8, when the fixed groove moves above the outer tube 9, the stop piece 4 will rotate outwards under the action of the stop spring to extend the teeth out of the fixed groove. After the shock work is completed, before the next shock, the pipe string needs to be lowered to reset the main body 8. During the reset process, the stop piece 4 moves downwards with the main body 8, and the lower surface of the tooth will contact the upper surface of the outer tube 9. At this time, after the upper surface of the outer tube 9 contacts the lower surface of the tooth, it will push the tooth upwards. As the main body 8 gradually descends, the outer tube 9 will gradually push into the main body 8 along the lower surface of the tooth. At this time, the stop piece 4 retracts into the main body 8, and the main body 8 can move downwards smoothly for reset. When the positions of the fixed groove and the movable groove coincide, the teeth of the stop piece 4 will pop out again under the action of the stop spring, and the teeth will fix the position of the main body 8 again.

[0031] A spring groove is provided at the top end of the stop piece 4, and the direction of the spring groove is opposite to that of the movable groove; an installation groove corresponding to the position of the spring groove is provided on the central rod 2. One end of the stop spring is located in the spring groove, and the other end is located in the installation groove. The position of the stop spring is fixed through the spring groove and the installation groove, preventing the position of the stop spring from shifting under the force during repeated shock work, resulting in device failure, and improving the practicability and stability of the device.

[0032] In the present utility model, the multi-stage shock device is formed by connecting multi-stage shockers end to end. During the actual working process, by adjusting the number of stages of the shockers and the stroke of each shocker, it can adapt to various installation dimensions. When replacing the existing shockers, there is no need to adjust the space for installing the original shockers, and the replacement difficulty of the device is low. Moreover, after replacing the existing shockers, within the same stroke space, the shock device composed of multi-stage shockers can generate a higher shock force. At the same time, during the downhole shock operation, impurities such as sand and oil stains in the well will adhere to the shockers, causing the shockers to become stuck. When a certain stage of the shocker in the shock device is stuck due to the adhesion of impurities in the well, the remaining shockers can still work normally, and the impact force generated during the shock operation will also act on the stuck shocker. By repeating the shock, the stuck shocker can be unjammed, thus realizing the automatic unjamming of the shock device during the downhole operation process, reducing the processing work for the stuck shocker, and improving the work efficiency.

[0033] Embodiment 2:

[0034] The specific efficacy of the present utility model is illustrated by comparing the performance of the retrievable multi-stage shock device provided by the present utility model with that of the commonly used 800mm stroke shocker in the prior art. At this time, the number of stages of the shockers in the shock device is 2.

[0035] For the installation space of the 800mm stroke shocker, the multi-stage shock device of the present utility model generally divides the stroke space into two levels, and the strokes of the two-stage shockers are 500mm and 300mm respectively. At this time, the shock force generated by the shock device in one shock stroke is the superposition of the shock forces generated by the two-stage shockers. The specific effects are shown in Table 1 and Table 2, which are the comparison of the working parameters and shock effects before and after the replacement of the shocker in a certain well area.

[0036] Table 1 Comparison of the basic parameters of the original tool and the new tool

[0037]

[0038]

[0039] Table 2 Comparison table of application effects (original shocker and multi-stage shock device)

[0040]

[0041] Combined with Figure 1-2 , the steps when this retrievable multi-stage shock device works are specifically described below:

[0042] Step 1: Assemble the device according to the work plan and lower it into the well together with the pipe string.

[0043] Step 2: When the pipe string gets stuck during downhole operation, lift the pipe string for shock hitting. During this process, in each stage of the shock hitter, after the main body receives an upward pulling force, the teeth of the stop piece extend into the movable groove to fix the position between the main body and the outer pipe. When the upward force received by the main body is large enough to push the teeth into the main body, the teeth move inward back into the main body, and the upward pulling force received by the main body is instantly released, driving the main body and the slider upward. After the slider collides with the outer pipe, a shock hitting force is generated.

[0044] Step 3: Lower the tool for resetting. During this process, when the tool is lowered, it pushes the shock hitting device downward. The main body of each stage of the shock hitter moves downward under force. When the lower surface of the teeth contacts the upper surface of the outer pipe, the teeth are pushed back into the main body. As the main body gradually moves downward, when the movable groove coincides with the fixed groove, the stop spring pushes the stop piece, and the teeth pass through the fixed groove and extend into the movable groove to achieve the reset of the device, completing one shock hitting stroke.

[0045] Step 4: Repeat Step 2 and Step 3 until the shock hitting and pipe string releasing work is completed.

[0046] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A retrievable multi-stage jarring device, characterized in that, Including: A multi-stage jarring tool connected end to end. Each jarring tool includes an upper sub (1) and a body (8). The body (8) is connected below the upper sub (1). An outer pipe (9) is provided outside the body (8), and a lower sub (7) is provided at the bottom end of the outer pipe (9). In two adjacent upper and lower stages of jarring tools, the lower sub of the upper-stage jarring tool is connected to the upper sub of the lower-stage jarring tool. A slider (6) is provided at the bottom end of the body (8). Two vertically oriented movable grooves are provided on the outer pipe (9), and the left and right ends of the slider (6) respectively correspond to the positions of the two movable grooves. The left and right ends of the slider (6) extend into one movable groove each. An umbrella-shaped fish head center rod (2) is provided inside the body (8), and a fish head is provided at the top end of the umbrella-shaped fish head center rod (2). A fixed groove corresponding to the position of the movable groove is provided on the side wall of the body (8). A stop piece (4) is provided at the bottom end of the center rod (2). The bottom end of the stop piece (4) is connected to the center rod (2) and can rotate around the connection point towards the fixed groove. The top end of the stop piece (4) is provided with outwardly protruding teeth. The teeth are screwed into the movable groove through the fixed groove, and the upper surface of the teeth is an inclined surface facing downwards. The bottom end of the stop piece (4) is connected to the center rod (2) through a stop pin (5), and a stop spring is provided between the top end of the stop piece (4) and the center rod (2).

2. The retrievable multi-stage jarring device according to claim 1, characterized in that, The number of the jarring tools is two.

3. The retrievable multi-stage jarring device according to claim 1, wherein, The connection between the upper sub (1) and the body (8) is detachable.

4. The retrievable multi-stage jarring device according to claim 1, wherein, The fish head is a multi-stage umbrella-shaped stepped structure.

5. The retrievable multi-stage jarring device according to claim 1, characterized in that, The umbrella-shaped fish head center rod (2) is provided with a circumferentially protruding boss, and a compression spring (3) is provided between the boss and the bottom end of the upper sub (1).

6. The retrievable multi-stage jarring device according to claim 1, wherein, The lower surface of the teeth is an inclined surface that contracts downwards.

7. The retrievable multi-stage jarring device according to claim 1, wherein, The top end of the stop piece (4) is provided with a spring groove, and the direction of the spring groove is opposite to that of the movable groove. The umbrella-shaped fish head center rod (2) is provided with an installation groove corresponding to the position of the spring groove. One end of the stop spring is located in the spring groove, and the other end is located in the installation groove.

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