Double-set jar knocker
By designing a dual-set shock absorber, utilizing the linear movement and rotation of the central core rod, the breather hole of the outer cylinder, and the integrated design of the joint and hammer seat, the problem of time-consuming and labor-intensive rope well workover tools was solved, achieving efficient and safe downhole construction.
Patent Information
- Application Number
- CN202520044866.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2035-01-09
AI Technical Summary
Existing rope-assisted well workover tools are time-consuming and labor-intensive, and there are difficulties in dealing with obstacles or jamming when the tools are lowered into the well, resulting in low construction efficiency, high costs, and high labor intensity.
Design a dual-set shock absorber, including a central core rod, an upper connecting seat, an outer cylinder, a hammer, and a lower connecting seat. The central core rod can move linearly and rotate. The outer cylinder is provided with a vent hole to provide bidirectional upward and downward force and reduce water hammer effect through the vent hole. The upper and lower connectors and hammer seat are designed in one piece to improve shock force and reduce the risk of tripping.
It effectively overcomes the problem of tool rotation in rope well repair operations, improves the success rate and efficiency of construction, reduces water hammer effect, reduces the risk of tool disengagement, ensures safe and reliable operation, reduces the labor intensity of workers, and increases labor efficiency by more than 50%.
Smart Images
Figure CN223510886U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of oilfield workover operation, and particularly relates to a double-sleeve jar. BACKGROUND
[0002] In the production operation construction of oil and water wells, especially in the rope workover operation, due to the scenarios such as scaling and waxing of the inner wall of the wellbore, sand production of the formation, tool falling into the well, and the like, the workover operation construction needs to be carried out, such as wellbore passing, lead mold printing, sand fishing, and fallen object fishing construction, and therefore the downhole tool string often encounters resistance and sticking, and the like, disposal difficulties, and the subsequent construction is often completed by using the traditional tubing running operation process, which is time-consuming, labor-intensive, low in efficiency, and high in labor intensity and operation cost. Therefore, there is an urgent need to provide a double-sleeve jar suitable for rope rapid workover operation and an operation method thereof. CONTENT OF THE UTILITY MODEL
[0003] One of the purposes of the present application is to provide a double-sleeve jar, aiming at solving the problem of time and labor consumption of the existing rope workover operation tool.
[0004] The technical solution of the present application is as follows:
[0005] A double-sleeve jar comprises a middle core rod, an upper connecting seat, an outer cylinder, a hammer, and a lower connecting seat. One end of the upper connecting seat is connected to the top end of the outer cylinder. The lower connecting seat is connected to the bottom end of the outer cylinder. One end of the middle core rod passes through the upper connecting seat and is linearly movable and rotatably arranged in the inner cavity of the outer cylinder. The hammer is arranged on the end of the middle core rod and is in the inner cavity of the outer cylinder, and is used to hammer the upper connecting seat or the lower connecting seat when moving up and down.
[0006] As a technical solution of the present application, the upper connecting seat comprises an upper joint and an upper hammer seat which are integrally connected. The upper connecting seat is threadedly connected to the outer cylinder through the upper hammer seat.
[0007] As a technical solution of the present application, the upper joint is outside the top end of the outer cylinder, and the outer diameter of the upper joint is greater than or equal to the outer diameter of the outer cylinder.
[0008] As a technical solution of the present application, an outer thread is arranged on the outer peripheral wall of the upper hammer seat, an inner thread is arranged on the inner peripheral wall of the top end of the outer cylinder, and the upper hammer seat is threadedly connected to the outer cylinder through the outer thread and the inner thread.
[0009] As a technical solution of the present application, the lower connecting seat comprises a lower joint and a lower hammer seat which are integrally connected. The lower connecting seat is threadedly connected to the outer cylinder through the lower hammer seat.
[0010] As one technical solution of this application, the lower connector is located outside the bottom end of the outer cylinder, and the outer diameter of the lower connector is greater than or equal to the outer diameter of the outer cylinder.
[0011] As one technical solution of this application, the outer peripheral wall of the lower hammer seat is provided with an external thread, and the inner peripheral wall of the bottom end of the outer cylinder is provided with an internal thread. The lower hammer seat is threadedly connected to the outer cylinder through the external thread and the internal thread.
[0012] As one technical solution of this application, two sets of breathing holes are provided on the outer cylinder at intervals; one set of breathing holes has two holes, which are symmetrically arranged on opposite sides of the outer cylinder near the upper connecting seat; the other set of breathing holes has two holes, which are symmetrically arranged on opposite sides of the outer cylinder near the lower connecting seat.
[0013] As one technical solution of this application, the breathing holes are strip-shaped holes, and all of them are arranged along the length direction of the outer cylinder.
[0014] The beneficial effects of this application are:
[0015] This device provides bidirectional upward and downward forces to the entire downhole tool string. Its central core rod can move linearly and rotate freely relative to its outer cylinder, effectively overcoming the problem of downhole tools not being able to rotate in wireline workover operations, thus significantly improving the success rate of the operation. Simultaneously, the outer cylinder is designed with two sets of breather holes. Therefore, when the device is lowered into the well, the lower set of breather holes draws in liquid and discharges it from the upper set during upward movement, and the upper set of breather holes draws in liquid and discharges it from the lower set during downward movement. These two sets of breather holes can work simultaneously, effectively reducing water hammer and significantly increasing downhole shock force, thereby improving the success rate of the operation. Furthermore, the integrated design of the upper connector and upper hammer seat, and the integrated design of the lower connector and lower hammer seat, prevents the shock force from being transmitted to the upper and lower connectors, greatly reducing the risk of tool disengagement. Moreover, this device can be equipped with a weighted oil connection pipe, making it convenient and safe to operate, effectively reducing the labor intensity of workers, and improving labor efficiency by more than 50% compared to traditional methods. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.
[0017] Figure 1This is a schematic diagram of a dual-set shock absorber provided in an embodiment of this application.
[0018] Icons: 1-Central core rod; 2-Upper connector; 3-Upper hammer seat; 4-Outer cylinder; 5-Hammer; 6-Lower connector; 7-Lower hammer seat; 8-Breath hole. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0022] In the description of this application, it should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. They are only used to facilitate the description of this application and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0023] Furthermore, in this application, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Moreover, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0024] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0025] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0026] Example:
[0027] Please refer to Figure 1 This application provides a dual-set shock absorber, mainly used in well workover operations such as well cleaning, lead mold printing, sand removal, and debris retrieval in oil and water wells. It mainly includes a central core rod 1, an upper connecting seat, an outer cylinder 4, a hammer 5, and a lower connecting seat. One end of the upper connecting seat is connected to the top of the outer cylinder 4; the lower connecting seat is connected to the bottom of the outer cylinder 4. Furthermore, one end of the central core rod 1 passes through the upper connecting seat and is linearly movable and rotatably mounted within the inner cavity of the outer cylinder 4. The hammer 5 is mounted on the end of the central core rod 1 and located within the inner cavity of the outer cylinder 4, used to strike either the upper or lower connecting seat during vertical movement.
[0028] This device can provide bidirectional upward and downward forces to the entire downhole tool string. The central core rod 1 can move linearly and rotate freely relative to its outer cylinder 4, thus effectively overcoming the problem that downhole tools cannot rotate during rope workover operations and effectively improving the success rate of the operation.
[0029] Furthermore, the upper connecting seat includes an integrally formed upper connector 2 and an upper hammer seat 3; the upper connecting seat is threadedly connected to the outer cylinder 4 via the upper hammer seat 3. Simultaneously, the upper connector 2 is located outside the top end of the outer cylinder 4, and the outer diameter of the upper connector 2 is greater than or equal to the outer diameter of the outer cylinder 4. Moreover, the outer peripheral wall of the upper hammer seat 3 is provided with external threads, and the inner peripheral wall at the top end of the outer cylinder 4 is provided with internal threads; the upper hammer seat 3 is threadedly connected to the outer cylinder 4 via the external and internal threads.
[0030] Furthermore, the lower connecting seat includes an integrally formed lower connector 6 and a lower hammer seat 7; the lower connecting seat is threadedly connected to the outer cylinder 4 via the lower hammer seat 7. Simultaneously, the lower connector 6 is located outside the bottom end of the outer cylinder 4, and the outer diameter of the lower connector 6 is greater than or equal to the outer diameter of the outer cylinder 4. Moreover, the outer peripheral wall of the lower hammer seat 7 is provided with external threads, and the inner peripheral wall at the bottom end of the outer cylinder 4 is provided with internal threads; the lower hammer seat 7 is threadedly connected to the outer cylinder 4 via the external and internal threads.
[0031] In addition, two sets of vent holes 8 are provided at intervals on the outer cylinder 4; one set of vent holes 8 has two holes, which are symmetrically arranged on opposite sides of the outer cylinder 4 near the upper connecting seat; the other set of vent holes 8 has two holes, which are symmetrically arranged on opposite sides of the outer cylinder 4 near the lower connecting seat. Specifically, the vent holes 8 are strip-shaped holes, and they are all arranged along the length of the outer cylinder 4.
[0032] Therefore, by designing two sets of breathing holes 8 on the outer cylinder 4, when the device is lowered into the well, when it moves upward, the lower set of breathing holes 8 draws in liquid and discharges it from the upper set of breathing holes 8; when it moves downward, the upper set of breathing holes 8 draws in liquid and discharges it from the lower set of breathing holes 8. The two sets of breathing holes can work simultaneously, thereby effectively reducing the water hammer effect, greatly increasing the downhole shock force, and thus effectively improving the success rate of construction.
[0033] Meanwhile, the length of the lower hammer seat 7 is greater than the length of the upper hammer seat 3, so the device can provide a greater downward force to the entire downhole tool string.
[0034] Furthermore, the integrated design of the upper connector 2 and upper hammer seat 3, and the integrated design of the lower connector 6 and lower hammer seat 7, prevents the impact force from being transmitted to the upper and lower connectors, thus greatly reducing the risk of tool disengagement. In addition, this device can be equipped with an oil pipe for weighting, making it convenient and safe to operate, effectively reducing the labor intensity of workers, and improving labor efficiency by more than 50% compared to traditional operating methods.
[0035] The device is powered by a hydraulic motor on a vehicle-mounted winch. The double-set shock absorber and corresponding downhole tools such as well gauges, lead stamps, sand removal tools, and fishing tools are connected to the steel wire rope wound on the winch and lowered into the wellbore. The winch is used to lift and lower the device, allowing the core rod 1 to move up and down relative to the outer cylinder 4. The hammer 5 connected to the core rod 1 can strike the upper hammer seat 3 and the lower hammer seat 7 from both directions, providing bidirectional shock force to the entire downhole tool string, thus enabling rapid rope-assisted well repair operations inside the wellbore.
[0036] The working tool string is formed by sequentially connecting the cable end, the core rod 1 of the double-set shock absorber, the upper connector 2, the upper hammer seat 3, the outer cylinder 4, the hammer 5, the lower hammer seat 7, the lower connector 6, and the downhole workover tools. During use, the tool string is lowered into the well by traction of the wire rope via a vehicle-mounted hydraulic winch. A rope sealing device, a standard feature in existing technology, is installed at the wellhead to prevent fluid leakage. The tubing connected above the cable and below the core rod 1 or the lower connector 6 provides sufficient mass (M) for the workover operation. When the downhole workover tools encounter obstruction, the core rod 1 enters the outer cylinder 4, and the hammer 5 on the core rod 1 strikes the lower hammer seat 7 downwards, providing sufficient downward velocity (V) and momentum (P) to the entire downhole workover tool string. When the downhole workover tools become stuck, the hammer 5 on the core rod 1 strikes the upper hammer seat 3 upwards, providing an upward force to the entire downhole workover tool string. At this time, the two sets of breather holes 8 on the outer cylinder 4 operate simultaneously, reducing water hammer effect and effectively increasing bidirectional shock force to complete the workover operation. The depth of construction is indicated by existing rope gauges, and the maximum tension on the rope during operation is provided by existing tensioning devices.
[0037] It should be noted that, since the core rod 1 and the outer cylinder 4 can move up and down and rotate relative to each other, when the rope-assisted workover tool encounters obstruction during descent, the core rod 1 enters the outer cylinder 4, and the hammer 5 on the core rod 1 strikes the lower hammer seat 7 downwards, providing an upward force to the entire descent tool string. When the rope-assisted workover tool gets stuck during descent, the hammer 5 on the core rod 1 strikes the upper hammer seat 3 upwards, providing a downward force to the entire descent tool string. Therefore, this device can complete tasks such as unblocking, lead mold printing, and sand dredging, effectively improving the success rate and efficiency of construction, and can also be reused multiple times.
[0038] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. A dual-set shock absorber, characterized in that, It includes a central core rod, an upper connecting seat, an outer cylinder, a hammer, and a lower connecting seat; one end of the upper connecting seat is connected to the top end of the outer cylinder; the lower connecting seat is connected to the bottom end of the outer cylinder; one end of the central core rod passes through the upper connecting seat and is linearly movable and rotatably disposed in the inner cavity of the outer cylinder; the hammer is disposed on the end of the central core rod and is located in the inner cavity of the outer cylinder, and is used to strike the upper connecting seat or the lower connecting seat when moving up and down.
2. The dual-set shock absorber according to claim 1, characterized in that, The upper connecting seat includes an integrally formed upper connector and an upper hammer seat; the upper connecting seat is threadedly connected to the outer cylinder through the upper hammer seat.
3. The dual-set shock absorber according to claim 2, characterized in that, The upper connector is located outside the top of the outer cylinder, and the outer diameter of the upper connector is greater than or equal to the outer diameter of the outer cylinder.
4. The dual-set shock absorber according to claim 2, characterized in that, The outer peripheral wall of the upper hammer seat is provided with an external thread, and the inner peripheral wall of the top end of the outer cylinder is provided with an internal thread. The upper hammer seat is threadedly connected to the outer cylinder through the external thread and the internal thread.
5. The dual-set shock absorber according to claim 1, characterized in that, The lower connecting seat includes an integrally formed lower connector and a lower hammer seat; the lower connecting seat is threadedly connected to the outer cylinder through the lower hammer seat.
6. The dual-set shock absorber according to claim 5, characterized in that, The lower connector is located outside the bottom end of the outer cylinder, and the outer diameter of the lower connector is greater than or equal to the outer diameter of the outer cylinder.
7. The dual-set shock absorber according to claim 5, characterized in that, The outer peripheral wall of the lower hammer seat is provided with an external thread, and the inner peripheral wall of the bottom end of the outer cylinder is provided with an internal thread. The lower hammer seat is threadedly connected to the outer cylinder through the external thread and the internal thread.
8. The dual-set shock absorber according to claim 1, characterized in that, Two sets of breathing holes are provided on the outer cylinder at intervals; one set of breathing holes has two holes, which are symmetrically arranged on opposite sides of the outer cylinder near the upper connecting seat; the other set of breathing holes has two holes, which are symmetrically arranged on opposite sides of the outer cylinder near the lower connecting seat.
9. The dual-set shock absorber according to claim 8, characterized in that, The breathing holes are strip-shaped holes, and all of them are arranged along the length of the outer cylinder.