Packing replacing tool

Abstract

The invention belongs to the technical field of oil exploitation, and particularly discloses a packing replacement tool which comprises a lifting device, a cylindrical component and an ejector rob, the lifting device comprises a main body part and a lifting part slidably arranged on the main body part, and the lifting part can linearly move in the vertical direction relative to the main body part; the upper part of the side wall of the cylindrical part is fixedly connected with the main body part, and the side wall, far away from the main body part, of the cylindrical part is provided with an opening with the same length as the cylindrical part in the length direction of the cylindrical part; a first locking part used for connecting the two sides of an opening of the cylindrical part is fixedly arranged at the opening, close to one end of the main body part, of the cylindrical part in the length direction, and the ejector rod is horizontally and fixedly arranged at the top of the lifting part. According to the packing replacing tool, the belt type packing can be rapidly replaced by a single person, the replacing time is shortened, the working efficiency is improved, the labor intensity of operators is reduced, and the packing replacing tool is suitable for petroleum exploitation.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, specifically a packing replacement tool. Background Technology

[0002] In oil extraction, pumping units are crucial surface lifting equipment. To prevent oil leakage between the pumping unit's polished rod and the wellhead, a packing box is installed at the wellhead. This box is removably filled with packing for sealing, effectively sealing the gap between the wellhead and the pumping unit's polished rod. As oilfield operations extend, multiple recovery stages occur, leading to more and more wells experiencing water breakthroughs, accumulation, intermittent production, or low-fluid levels. These special wells require frequent replacement of belt-type packing.

[0003] When replacing belt-type packing at the pumping unit wellhead, the packing and packing chamber seal is interference-fitted, making it difficult to insert the packing into the chamber. A hammer or other specialized tools are needed to force the packing into the chamber by impact, a process that typically takes over an hour, is time-consuming and labor-intensive, and has low efficiency. Furthermore, this method of replacing packing by impact carries the risk of injury, especially if the wellhead is relatively high; loss of balance can lead to falls. Therefore, replacing belt-type packing is challenging and adds unnecessary physical strain to the operators. Due to the difficulty and safety hazards of this method, two people are required to complete the packing replacement operation. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this invention aims to provide a packing replacement tool that allows one person to quickly, conveniently, and safely replace belt-type packing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A packing replacement tool includes a lifting device, a cylindrical component, and a top rod. The lifting device includes a main body and a lifting part slidably disposed on the main body. The lifting part is capable of linear movement relative to the main body in a vertical direction. The upper part of the side wall of the cylindrical component is fixedly connected to the main body. A supporting component for lifting the main body is also fixedly disposed on the side wall of the cylindrical component, which is located at the lower part of the junction between the main body and the cylindrical component. An opening with the same length as the cylindrical component is opened on the side wall of the cylindrical component away from the main body. A first locking component for connecting the two sides of the opening of the cylindrical component to each other is fixedly disposed at the opening near the end of the main body in the length direction of the cylindrical component. The top rod is horizontally fixedly disposed on the top of the lifting part.

[0006] As a limitation of the present invention: a retaining ring is fixedly provided at the end of the top rod away from the lifting part, and an opening with the same length as the retaining ring is provided on the side wall away from the lifting part. A second locking component for connecting the two sides of the retaining ring opening to each other is fixedly provided at the end of the retaining ring away from the lifting part.

[0007] As a limitation of the present invention: the top rod is shaped like a "Γ", which includes a rod body in the horizontal direction and a screw rod that is vertically fixed to the lower side wall of the rod body. The screw rod is located at one end of the rod body near the lifting part, and the screw rod is threadedly connected to the lifting part.

[0008] As a limitation of the present invention: the packing replacement tool further includes a sleeve with internal threads, and the end of the screw away from the rod body and the top of the lifting part are simultaneously threadedly connected to the sleeve.

[0009] As a limitation of the present invention: the end of the sleeve away from the lifting part also has a locking nut sleeved on the screw rod, and the locking nut and the screw rod are threadedly connected.

[0010] As a limitation of the present invention: the packing replacement tool further includes a collar, which is detachably sleeved on the lower part of the outer wall of the main body, the top of the cylindrical component is fixedly connected to the collar, and the upper surface of the cylindrical component and the upper surface of the collar are located on the same horizontal plane.

[0011] As a limitation of the present invention: the lifting device is a hydraulic jack.

[0012] As a limitation of the present invention: the first locking component includes two nuts coaxially fixed at the top side wall of the opening of the cylindrical component, and a bolt passing through the two nuts simultaneously, the two nuts being locked together by the bolt.

[0013] As a limitation of the present invention: the second locking component includes two nuts coaxially fixedly disposed on the side wall of the circlip opening, and a bolt passing through the two nuts simultaneously, the two nuts being locked together by the bolt.

[0014] As a limitation of the present invention: the supporting component is a rigid rod-shaped object.

[0015] By adopting the above technical solution, the beneficial effects achieved by the present invention compared with the prior art are as follows: After the cylindrical component with an inner diameter larger than the outer diameter of the polished rod and the retaining ring are sleeved on the polished rod, the cylindrical component and the retaining ring are locked respectively by the first locking component and the second locking component, and there are gaps between the cylindrical component and the polished rod, and between the retaining ring and the polished rod. Therefore, the cylindrical component and the retaining ring can move up and down or rotate at any angle relative to the polished rod of the pumping unit, thereby allowing the packing replacement tool to move up and down relative to the polished rod of the pumping unit, or to rotate freely around the polished rod, which is beneficial for the packing replacement tool to conveniently and quickly correspond to the position of the new packing.

[0016] Because the cylindrical component is fixedly connected to the collar, and the collar is fitted onto the lower part of the outer wall of the main body of the lifting device, when the lifting part of the lifting device moves upward, it is blocked by the square clamp on the upper part of the lifting part, which is mounted on the smooth rod, causing the main body to move downward. This, in turn, causes the cylindrical component to move downward, pressing the packing from the packing compartment into the packing compartment. A single person can quickly replace the belt-type packing, reducing replacement time and improving work efficiency. This packing replacement tool not only saves manpower and reduces the labor intensity of operators, but also avoids the risks of hand injuries or accidental injury that can occur with traditional methods of replacing packing by striking. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a three-dimensional structural diagram of one angle in an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram from another angle of an embodiment of the present invention.

[0019] In the diagram: 1-Lifting device, 2-Lock, 3-Cylindrical component, 4-Top rod, 5-Supporting component, 6-First locking component, 7-Second locking component, 8-Snap ring, 9-Sleeve, 10-Locking nut. Detailed Implementation

[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the packing replacement tool described herein is a preferred embodiment and is only used for illustration and explanation of the present invention, and does not constitute a limitation thereof.

[0021] The directional terms or positional relationships used in this invention, such as "up," "down," "left," and "right," are based on the positional relationships in the accompanying drawings of this invention. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this invention.

[0022] like Figure 1 and Figure 2As shown, a packing replacement tool includes a lifting device 1, a collar 2, a cylindrical component 3, and a push rod 4. The lifting device 1 includes a main body and a lifting section, which is slidably mounted on the main body and can move linearly relative to the main body in a vertical direction. The collar 2 is detachably fitted onto the lower outer wall of the main body of the lifting device 1. Specifically, the lifting device 1 is a hydraulic jack or an electric lifting platform. By pressing the hydraulic handle or driving the lifting platform up and down, the collar 2 moves up and down with the lifting device 1. In this embodiment, the lifting device 1 is a hydraulic jack, the main body is a cylinder, and the lifting section includes a piston and a piston rod. The upper part of the cylindrical component 3 is fixedly connected to the collar 2, thus the lifting device 1 and the cylindrical component 3 form a whole, allowing the cylindrical component 3 to move in the same direction as the main body. In this embodiment, the top of the cylindrical component 3 is fixedly connected to the collar 2, and the upper surface of the cylindrical component 3 and the upper surface of the collar 2 are on the same horizontal plane, which facilitates the cylindrical component 3 fully extending into the packing compartment and pressing the packing into the appropriate position.

[0023] A support member 5 for supporting the main body is fixedly installed on the side wall of the cylindrical component 3 near the main body, and is located at the lower part of the junction between the main body and the cylindrical component 3. The support member 5 contacts the chassis of the main body to better fix the lifting device 1 in the packing replacement tool. The cylindrical component 3 is a semi-circular pressure tongue, and its top view is "C" shaped. The support member 5 is a rigid rod, preferably a bolt. An opening with the same length as the cylindrical component 3 is opened on the side wall away from the main body. The width of this opening is greater than the outer diameter of the pumping unit's polished rod, and the outer diameter of the opening is smaller than the diameter of the packing compartment. By opening a long strip-shaped opening on the cylindrical component 3, the cylindrical component 3 can slide on the polished rod and rotate freely around the polished rod, which facilitates the alignment with the position of the new packing. The inner diameter of the cylindrical component 3 is greater than the outer diameter of the polished rod, and the length of the cylindrical component 3 is greater than the depth of the packing compartment, which is conducive to smoothly pressing the packing into the packing compartment.

[0024] A first locking component 6 is fixedly installed at the opening near one end of the main body along the length direction of the cylindrical component 3. This is used to connect the two sides of the opening of the cylindrical component 3 to each other, preventing the cylindrical component 3 from separating from the guide rod during tool use, thereby preventing the tool from slipping off the guide rod and causing injury. Specifically, the first locking component 6 includes two nuts coaxially fixed at the top side wall of the opening of the cylindrical component 3, and a bolt passing through both nuts. The two nuts are locked together by the bolt.

[0025] When the packing is pressed down using this tool, the lifting unit will move upward along the guide rod. A square clamp needs to be installed on the guide rod to block the lifting device 1. Furthermore, a top rod 4, used to prevent the lifting unit from moving upward, is horizontally fixed at the top of the lifting unit. This facilitates the square clamp applying a reaction force to the lifting unit, ensuring that the cylindrical component 3, which is fixedly connected to the main body, moves downward. Alternatively, other detachable components, such as guide rod clamps, U-shaped locks, or toothless clips, can be used to replace the square clamp to prevent the lifting device 1 from moving upward.

[0026] The top rod 4 is detachably and horizontally connected to the top of the lifting unit. A second locking component 7 is fixedly installed at the end of the top rod 4 away from the lifting unit to further prevent the packing replacement tool from slipping off the rod. Specifically, the top rod 4 is shaped like a "Γ", which includes a rod body extending horizontally and a screw rod extending vertically and fixedly connected to the lower side wall of the rod body. The screw rod is located at the end of the rod body near the lifting unit and is connected to the top of the lifting unit by a threaded connection.

[0027] The packing replacement tool also includes a threaded sleeve 9. The end of the screw furthest from the main body and the top of the lifting section are both threadedly connected to the sleeve 9 to better secure the top rod 4 to the top of the lifting section. After prolonged use, the screw and sleeve 9 may loosen; therefore, a locking nut 10 is fitted onto the screw at the end of the sleeve 9 furthest from the main body, and the locking nut 10 is threadedly connected to the screw. Specifically, the locking nut 10 is a reverse nut to lock the screw and sleeve 9 together.

[0028] Furthermore, a retaining ring 8 is fixedly installed at the end of the rod body away from the screw. An opening, the same length as the retaining ring 8, is formed on the side wall of the retaining ring 8 away from the screw. The width of this opening is greater than the outer diameter of the polished rod of the pumping unit, and the inner diameter of the retaining ring 8 is greater than the outer diameter of the polished rod. This facilitates the retaining ring 8 being fitted onto the polished rod, thereby driving the lifting device 1 to slide along or rotate around the polished rod, better corresponding to the position of the new packing. The top view of the retaining ring 8 is "C" shaped. A second locking component 7 is fixedly installed at the end of the retaining ring 8 away from the screw to prevent the lifting device 1 from separating from the polished rod during tool use. Specifically, the second locking component 7 includes two nuts coaxially fixed at the side wall of the opening of the retaining ring 8, and a bolt passing through both nuts. The two nuts are locked together by the bolt.

[0029] The packing replacement tool with the above structure, after fitting a cylindrical component 3 (with an inner diameter larger than the outer diameter of the pumping unit's polished rod) and a retaining ring 8 onto the polished rod, uses a first locking component 6 and a second locking component 7 to lock the cylindrical component 3 and the retaining ring 8 respectively, with gaps between the cylindrical component 3 and the polished rod, and between the retaining ring 8 and the polished rod. Therefore, both the cylindrical component 3 and the retaining ring 8 can move up and down or rotate at any angle relative to the pumping unit's polished rod, allowing the packing replacement tool to move up and down relative to the pumping unit's polished rod or rotate freely around the polished rod, which facilitates convenient and quick alignment of the packing replacement tool with the position of the new packing.

[0030] Furthermore, since the cylindrical component 3 is fixedly connected to the collar 2, and the collar 2 is fitted onto the lower part of the outer wall of the main body of the lifting device 1, when the lifting part of the lifting device 1 moves upward, it will be blocked by the square clamp located on the upper part of the lifting part and mounted on the smooth rod, causing the main body to move downward, which in turn causes the cylindrical component 3 to move downward as well, pressing the packing from the packing compartment into the packing compartment. This allows a single person to quickly replace the belt-type packing, reducing replacement time and improving work efficiency. The aforementioned packing replacement tool not only saves manpower and reduces the labor intensity of operators, but also avoids the risks of hand injuries or accidental injury that may occur with traditional methods of replacing packing by striking.

[0031] When using the packing replacement tool described above, the tool is slidably mounted on the smooth rod by passing bolts through the first locking component 6 and the second locking component 7, and the locking nut 10 is tightened. The square clamp is then installed on the smooth rod and positioned above the packing replacement tool. The belt-type packing is cut open and fitted onto the smooth rod at the packing compartment opening. The hydraulic handle is pressed down so that the lower end of the semi-circular pressure tongue contacts the packing, avoiding overlap with the packing opening. As the semi-circular pressure tongue moves downward, the packing is slowly pressed into the packing compartment. Once the packing reaches the bottom of the packing compartment, the pressure relief valve is loosened, and the top rod 4 is pressed down to retract the hydraulic rod of the hydraulic jack into the hydraulic cylinder. Then, the pressure relief valve is tightened, the packing replacement tool is lifted upward, and the next packing is fitted at the packing compartment opening, ensuring that the shear line of this packing does not overlap with the shear line of the previous packing pressed into the packing compartment to guarantee a good seal. Then, using the smooth rod as the axis of rotation, rotate the tool, ensuring the lower end of the semi-circular pressure tongue does not align with the shear line of the new packing. Repeat the pressing steps described above to press the new packing into the packing compartment. After all packing has been filled, loosen the first locking component 6 and the second locking component 7, remove the packing replacement tool from the smooth rod, and remove the square clip to complete the packing replacement operation.

Claims

1. A packing replacement tool, characterized in that: It includes a lifting device, a cylindrical component, and a top rod. The lifting device includes a main body and a lifting part that is slidably mounted on the main body. The lifting part is capable of linear motion relative to the main body in the vertical direction. The upper part of the side wall of the cylindrical component is fixedly connected to the main body. A support component for supporting the main body is also fixedly installed on the side wall of the cylindrical component, which is located at the lower part of the connection between the main body and the cylindrical component. An opening with the same length as the main body is provided on the side wall of the cylindrical component away from the main body. A first locking component for connecting the two sides of the opening of the cylindrical component to each other is fixedly provided at the opening near the main body in the length direction of the cylindrical component. The top rod is horizontally fixedly provided at the top of the lifting part.

2. The packing replacement tool according to claim 1, characterized in that: A retaining ring is fixedly installed at the end of the top rod away from the lifting part. An opening with the same length as the retaining ring is opened on the side wall away from the lifting part. A second locking component is fixedly installed at the end of the retaining ring away from the lifting part to connect the two sides of the retaining ring opening to each other.

3. The packing replacement tool according to claim 2, characterized in that: The top rod is shaped like a "Γ" and includes a rod body in the horizontal direction and a screw rod that is vertically fixed to the lower side wall of the rod body. The screw rod is located at one end of the rod body near the lifting part and is threadedly connected to the lifting part.

4. The packing replacement tool according to claim 3, characterized in that: It also includes a sleeve with internal threads, and the end of the screw away from the rod body and the top of the lifting part are simultaneously threaded to the sleeve.

5. The packing replacement tool according to claim 4, characterized in that: The end of the sleeve away from the lifting part also has a locking nut sleeved on the screw rod, and the locking nut is threadedly connected to the screw rod.

6. The packing replacement tool according to claim 5, characterized in that: It also includes a collar, which is detachably fitted onto the lower part of the outer wall of the main body. The top of the cylindrical component is fixedly connected to the collar, and the upper surface of the cylindrical component and the upper surface of the collar are on the same horizontal plane.

7. The packing replacement tool according to any one of claims 1 to 6, characterized in that: The lifting device is a hydraulic jack.

8. The packing replacement tool according to claim 7, characterized in that: The first locking component includes two nuts coaxially fixed at the top side wall of the opening of the cylindrical component, and a bolt passing through both nuts. The two nuts are locked together by the bolt.

9. The packing replacement tool according to claim 8, characterized in that: The second locking component includes two nuts coaxially fixed at the side wall of the snap ring opening, and a bolt passing through both nuts. The two nuts are locked together by the bolt.

10. The packing replacement tool according to claim 9, characterized in that: The supporting component is a rigid rod.

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