A device for removing old sealing components from a sucker well polished rod seal.

Abstract

This utility model discloses a device for removing old seals from polished rod seals in oil wells. It includes a linear moving mechanism with a polished rod connector for connecting the polished rod. The moving rod of the linear moving mechanism is connected to a combined tool holder. The tool holder is equipped with a hook cutter, and the cutting edge of the hook cutter has a barb groove, forming a barb. The hook cutter of this utility model does not damage the packing when removing it, allowing for complete removal. Furthermore, the barb of the hook cutter can be machined using a milling machine, resulting in low production costs. This utility model allows for convenient, quick, and labor-saving removal of old seals without altering the structure of the polished rod seal, shortening well downtime, reducing or eliminating the impact of heavy oil and sand production on well restart, increasing the well restart success rate, reducing well workover costs, and demonstrating good practicality, ease of implementation, and significant economic benefits.

Description

Technical Field

[0001] This utility model relates to the field of wellhead equipment technology, specifically a device for removing old sealing parts from a polished rod seal in an oil well. Background Technology

[0002] In oil well pumping, the pumping unit drives the sucker rod and pump to reciprocate up and down to extract oil. Because the pumping system is closed and the extracted crude oil is under pressure, a seal is installed at the wellhead. To ensure the reliability of the seal, the surface of the first rod in the sucker rod string is polished to ensure a reliable seal when it mates with the seal. Therefore, the rod in the sucker rod string that passes through the seal and reciprocates within it is called the polished rod, and the seal is called the polished rod seal. The polished rod reciprocates within the polished rod seal, which tightly holds the rod in place. The seal within the polished rod seal is prone to damage and requires frequent replacement. Replacement is performed by stopping the well, removing the old seal, and then installing the new seal. The inner diameter of the sealing cavity of a polished rod sealer is generally no more than ¢58mm, with a polished rod of ¢25mm-¢32mm passing through it. The old seal is located in the annular space between the sealing cavity and the polished rod of the polished rod sealer. In such a narrow space and in the field environment, it is very difficult to remove the old seal. The time required to remove the old seal is long, resulting in a long well shutdown time. For heavy oil wells and sand-producing oil wells, a long shutdown time will make it difficult to restart the well, and many oil wells cannot be started, increasing well repair costs and causing great economic losses.

[0003] Announcement No. CN207795106U discloses a disassembly device for packing in a wellhead seal, including a clamping mechanism for mounting on a polished rod and fixing it thereto. The clamping mechanism has an annular sliding groove on its side wall. A rotating member is disposed within the sliding groove and slides along the groove. The rotating member has a through hole. An operating rod passes through the through hole and has a gear. A rack is disposed between the sliding member and the gear, and the gear drives the rack to slide vertically when it rotates. A spiral cutter is connected to the lower end of the rack.

[0004] The existing technology uses a spiral cutter, which requires both rotating the operating lever and making the entire operating lever rotate around the optical rod, resulting in low operating efficiency.

[0005] Announcement No. CN219901960U discloses a packing removal device, including a first operating handle, a second operating handle, a main rod, and a packing hook; the first operating handle is fixed to the upper right side of the main rod; the second operating handle is fixed to the upper left side of the main rod; a packing hook is integrally provided at the lower part of the main rod, so that the user can insert the packing hook into the packing in the packing chamber by pressing down the first operating handle and the second operating handle and rotating the main rod to hook out the packing, and then remove the packing by lifting the first operating handle and the second operating handle upward and rotating the main rod.

[0006] The existing packing hook structure exerts significant single-point pressure on the packing, which can easily scatter or break the packing, making it impossible to remove all the packing at once.

[0007] Announcement No. CN204175215U discloses a packing removal device for a pumping unit wellhead seal, which consists of a pressure cap and a barb rod. The pressure cap has a notch that is aligned with the notch in the pipe, and the upper surface of the pressure cap has an arc-shaped groove. The barb rod is T-shaped and is composed of a longitudinal rod and a transverse rod. There are two rows of barbs on the lower half of the longitudinal rod, which are distributed along both sides of the longitudinal rod. The bottom end of the longitudinal rod is a cone tip. There is a transverse rod at the top of the longitudinal rod, and the intersection of the transverse rod and the longitudinal rod is bent at a horizontal 90°, and a circular iron plate is welded on top of it.

[0008] The barbed structure of the existing technology is difficult to manufacture, which makes the production cost of the extractor high.

[0009] In summary, the technical solutions, technical problems to be solved, and beneficial effects of the above-disclosed technologies are all different from those of this utility model. For more technical features, technical problems to be solved, and beneficial effects of this utility model, the above-disclosed technical documents do not provide any technical inspiration. Utility Model Content

[0010] In order to overcome the shortcomings of the prior art and solve at least one of the technical problems mentioned in the background art, this utility model provides a device for removing old sealing parts of oil well polished rod seals.

[0011] To achieve the above objectives, the present invention adopts the following technical solution:

[0012] A device for removing old seals from a polished rod seal in an oil well includes a linear moving mechanism. The linear moving mechanism is equipped with a polished rod connector for connecting the polished rod. The moving rod of the linear moving mechanism is connected to a combined tool holder. The tool holder is equipped with a hook cutter, and the cutting edge of the hook cutter is provided with a barb groove to form a barb.

[0013] Furthermore, the tool holder is provided with hook blades arranged in a circumferential array, and the cutting edges of the hook blades are provided with barb grooves arranged in a straight line array to form barbs;

[0014] Specifically, the hook knife is a double-edged knife, and the lower end of the hook knife is pointed;

[0015] Specifically, the barb grooves on the two cutting edges of the hook knife are staggered, so that the barbs on the two cutting edges are staggered.

[0016] Specifically, the distance between the two cutting edges of the hook blade is greater than the thickness of the hook blade, and it is rhomboid in shape.

[0017] Furthermore, the tool holder is connected to the linear motion mechanism via a connecting plate;

[0018] Specifically, the upper end face of the connecting plate is provided with a through connecting hole, and one side end face of the connecting plate is provided with a groove, which is through in the vertical direction, and the tool holder is inserted into the groove.

[0019] Furthermore, the tool holder is composed of two semi-circular bodies that are axially inserted and joined together, and the outer wall of the tool holder is provided with a slot for engaging with a groove.

[0020] Furthermore, the two semi-circular structures are symmetrical about the axis center. One of the semi-circular structures has an axial through-hole at one end and a locking post at the other end. The locking hole partially overlaps with the end face of the semi-circular structure to form an opening.

[0021] Specifically, the locking pin can be engaged with the locking hole of the other semicircle, and the locking hole can be engaged with the locking pin of the other semicircle.

[0022] Specifically, a connecting hole is provided on the lower end face of the semi-circular body, and the connecting hole is connected to the upper end of the hook knife.

[0023] Furthermore, the opening width of the card hole is smaller than the diameter of the card hole; the width at the connection between the card post and the semicircular body is smaller than the opening width of the card hole.

[0024] Furthermore, the linear movement mechanism includes a drive box, in which an active component and a driven component are disposed. The active component drives the driven component to move linearly. The driven component is a moving rod, and the lower end of the driven component is connected to a connecting plate.

[0025] Specifically, the drive box has a first optical rod clamping surface on its end face parallel to the linear movement direction of the driven member. The optical rod connector includes a fixed chuck, and the fixed chuck has a second optical rod clamping surface. The fixed chuck is connected to the fixed chuck via a connector. The first optical rod clamping surface and the second optical rod clamping surface face each other to clamp the optical rod.

[0026] Furthermore, the driving element is a gear, the driven element is a rack, and the gear meshes with the rack;

[0027] Specifically, the gear is rotatably connected to the drive box, and the shaft of the gear extends out of the drive box and is provided with a connecting handle;

[0028] Specifically, a connecting post is provided at the lower end of the rack, the connecting post passes through the connecting hole of the connecting plate and is connected to a nut, the connecting post is provided with a step, and the nut presses the connecting plate tightly at the step.

[0029] Furthermore, both the first and second optical rod clamping surfaces have semi-circular inner walls and are provided with anti-slip grooves.

[0030] Furthermore, the drive box is provided with positioning studs on both sides of the first optical rod clamping surface, and the fixing chuck is provided with positioning holes on both sides of the second optical rod clamping surface. The positioning studs pass through the positioning holes and are connected to nuts.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. The hook knife of this utility model will not damage the packing when removing it, and can remove the root completely. Furthermore, the barb of the hook knife can be processed by a milling machine, resulting in low production cost.

[0033] 2. This utility model allows for convenient, quick, and labor-saving removal of old seals without altering the structure of the polished rod sealer, resulting in shorter well downtime, reduced or eliminated impact of heavy oil and sand production on well restart, high well restart success rate, reduced well repair costs, good practicality, ease of implementation, and significant economic benefits.

[0034] 3. This invention allows for easy pressing of the new seal into the sealing cavity, enabling rapid installation. After use, it can be disassembled and reused for each oil well.

[0035] 4. This utility model can be used in oil wells produced by oilfield pumping units, and can replace the seals in a timely and convenient manner to prevent the pumped well fluid from spraying, leaking, or seeping onto the wellhead surface. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the structure of a device for removing old sealing components from a polished rod seal in an oil well, according to this utility model.

[0037] Figure 2 This is a top view of the connecting disc in this utility model.

[0038] Figure 3 This is a top view of the tool holder in this utility model.

[0039] Figure 4 This is a schematic diagram of the semicircular structure in this utility model.

[0040] Figure 5 This is a schematic diagram of the hook knife in this utility model.

[0041] Figure 6 yes Figure 5 Cross-sectional view after being cut open at point AA

[0042] In the diagram: Driven component 1, Driven component 2, Drive box 3, Connecting plate 4, Connecting hole 4-1, Groove 4-2, Smooth rod 5, Fixed chuck 6, Tool holder 7, Semicircular body 7-0, Clamping hole 7-1, Semicircular hole wall 7-2, Clamping groove 7-3, Connecting hole 7-4, Clamping post 7-5, Hook knife 8, Barb 8-1, Threaded head 8-2, Old seal 9, Seal 10, Sealing cavity 10-1. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0044] Example 1:

[0045] Please see Figures 1 to 6 This utility model provides a device for removing old sealing parts of a pumping well polished rod seal, including a linear moving mechanism. The linear moving mechanism is provided with a polished rod connector for connecting the polished rod. The moving rod of the linear moving mechanism is connected to a combined tool holder 7. The tool holder 7 is provided with hooks 8 arranged in a circumferential array. The cutting edge of the hooks 8 is provided with barb grooves in a linear array, forming barbs 8-1 through the barb grooves.

[0046] Specifically, the hook knife 8 is a double-edged knife with a pointed lower end to reduce downward resistance and facilitate insertion of the hook knife 8 into the old seal 9. The barb grooves on the two cutting edges of the hook knife 8 are staggered, so that the barbs 8-1 on the two cutting edges are staggered. The distance between the two cutting edges of the hook knife 8 is greater than the thickness of the hook knife 8, forming a rhombus shape, which reduces the influence of the barb grooves on the strength of the hook knife 8 and ensures the overall strength of the hook knife 8.

[0047] Specifically, the tool holder 7 is connected to the linear movement mechanism via a connecting plate 4. The upper end face of the connecting plate 4 is provided with a through connecting hole 4-1, and one side end face of the connecting plate 4 is provided with a groove 4-2. The groove 4-2 is through in the vertical direction, and the tool holder 7 is inserted into the groove 4-2, so that the connecting plate 4 and the tool holder 7 are inserted into one piece.

[0048] Specifically, the tool holder 7 is composed of two semi-circular bodies 7-0 that are axially inserted and joined together. After the two semi-circular bodies 7-0 are joined together, they can only be separated axially and not radially. A slot 7-3 is provided in the middle of the outer wall of the tool holder 7. The slot 7-3 is used to match the groove 4-2 to engage the tool holder 7.

[0049] Specifically, the two semi-circular bodies 7-0 are symmetrical about their central axis. One semi-circular body 7-0 has an axially penetrating locking hole 7-1 at one end and a locking post 7-5 at the other end. The locking hole 7-1 partially overlaps with the end face of the semi-circular body 7-0 to form an opening. The locking post 7-5 can be inserted into the locking hole 7-1 of the other semi-circular body 7-0, and the locking hole 7-1 can engage with the locking post 7-5 of the other semi-circular body 7-0. The radius of the semi-circular hole wall 7-2 of the semi-circular body 7-0 is equal to the radius of the smooth rod 5. The lower end face of the semi-circular body 7-0 has a connecting hole 7-4 for threaded connection of the threaded head 8-2 at the upper end of the hook knife 8.

[0050] Specifically, the card hole 7-1 is an incomplete circular hole, the opening width of the card hole 7-1 is smaller than the diameter of the card hole 7-1, the card post 7-1 is an incomplete cylinder, the card post 7-1 is connected to the semi-circular body 7-0, and the width of the connection is smaller than the opening width of the card hole 7-1.

[0051] Furthermore, the linear movement mechanism includes a drive box 3, in which an active component 2 and a driven component 1 are disposed. The active component 2 drives the driven component 1 to move linearly. The driven component 1 is a moving rod. The lower end of the driven component 1 is connected to the connecting plate 4. The end face of the drive box 3 parallel to the linear movement direction of the driven component 1 is provided with a first optical rod clamping surface. The optical rod connector includes a fixed chuck 6. The fixed chuck 6 is provided with a second optical rod clamping surface. The fixed chuck 6 is connected to the fixed chuck 6 through a connector. The first optical rod clamping surface and the second optical rod clamping surface face each other to clamp the optical rod.

[0052] Specifically, the driving component 2 is a gear, and the driven component 1 is a rack. The gear meshes with the rack, and the gear is rotatably connected to the drive box 3. The shaft of the gear extends out of the drive box 3 and is provided with a connecting handle for tool clamping and rotation. A connecting post is provided at the lower end of the rack 1. The connecting post passes through the connecting hole 4-1 of the connecting plate 4 and is connected with a nut. The connecting post is provided with a step, and the nut presses the connecting plate 4 tightly against the step. Rotating the connecting handle of the gear 2 exposed outside the drive box 3 can drive the tool holder 7 to move up and down reciprocally.

[0053] Specifically, both the first and second optical rod clamping surfaces have semi-circular inner walls and are provided with anti-slip grooves. Anti-slip pads are provided in the grooves, and the first and second optical rod clamping surfaces face each other to clamp the optical rod 5.

[0054] Specifically, the drive box 3 is provided with positioning studs on both sides of the first optical rod clamping surface, and the fixed chuck 6 is provided with positioning holes on both sides of the second optical rod clamping surface. The positioning studs pass through the positioning holes and are connected to nuts to realize the quick positioning, connection and locking of the fixed chuck 6.

[0055] Example 2:

[0056] Based on Example 1, this example provides a method for using the extraction device.

[0057] Depend on Figure 1 It is known that the oil well polished rod seal includes a polished rod 5, an old seal 9, and a sealer 10. The polished rod 5 passes through the sealer 10, and the upper part of the sealer 10 has a sealing cavity 10-1. The old seal 9 is installed in the sealing cavity 10-1. The polished rod 5 and the inner wall of the sealing cavity 10-1 squeeze the old seal 9. A movable cutter holder 7 is set on the polished rod 5. Two hooks 8 are symmetrically set below the cutter holder 7. The hooks 8 have barbs 8-1 on both sides. The cutter holder 7 is driven to reciprocate by a linear moving mechanism fixed to the upper part of the polished rod 5. When the linear moving mechanism drives the cutter holder 7 to move downward, the hooks 8 are inserted into the old seal 9. The lower end of the hooks 8 is pointed and the cross section is prismatic, which reduces the downward resistance and facilitates the insertion of the hooks 8 into the old seal 9. When the linear moving mechanism drives the cutter holder 7 to move upward, the barbs 8-1 hook the old seal 9 and pull it out of the sealing cavity 10-1.

[0058] Specifically, when replacing the old seal 9, the old seal 9 needs to be removed first. After separating the pressure cap on the smooth rod sealer from the sealer 10, push it to the upper part of the smooth rod 5. Then, put the two semi-circular bodies 7-0 with hooks 8 on the smooth rod 5 to form a tool holder 7. Then, install the drive box 3 and the fixed chuck 6 on the smooth rod 5. At the same time, make the groove 4-2 of the connecting plate 4 fit into the slot 7-3 of the tool holder 7. The lower tip of the hook 8 enters the sealing cavity 10-1. Rotate the connecting handle exposed outside the drive box 3 to make the drive member 2 gear rotate, which drives the driven member 1 rack to move downward. Insert the hook 8 into the old seal 9. The barb 8-1 hooks the old seal. Then rotate the drive member 2 gear in the opposite direction to pull out the old seal 9 in one go.

[0059] This invention adds a mechanism to an existing smooth rod seal to make the removal of the old seal element convenient, quick, and labor-saving. After one well is used, it can be transferred to another, requiring minimal investment.

[0060] When a new seal needs to be installed after the old seal 9 has been removed, the hook 8 can be removed and replaced with a pressure sleeve / pressure rod, which can easily press the new seal into the sealing cavity 10-1. Therefore, this utility model can also quickly install seals.

[0061] All components not discussed in detail in this application, as well as the connection methods of these components, are well-known technologies in this field. They can be directly applied and will not be elaborated further.

[0062] In this utility model, the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0063] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit 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 utility model.

[0064] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for removing old seal parts from a polished rod seal in an oil well, comprising a linear movement mechanism, wherein the linear movement mechanism is provided with a polished rod connector for connecting the polished rod, characterized in that, The moving rod of the linear motion mechanism is connected to the combined tool holder; The tool holder is equipped with a hook blade, and the cutting edge of the hook blade is provided with a barb groove, through which a barb is formed.

2. The device for removing old sealing components from a sucker well polished rod seal according to claim 1, characterized in that, The tool holder is arranged in a circumferential array of hook blades, and the cutting edges of the hook blades are arranged in a straight array of barb grooves. The hook knife is a double-edged knife with a pointed tip at the lower end; The barb grooves on the two cutting edges of the hook knife are staggered, so that the barbs on the two cutting edges are staggered. The distance between the two cutting edges of the hook is greater than the thickness of the hook, forming a rhombus shape.

3. The device for removing old sealing components from a sucker well polished rod seal according to claim 1, characterized in that, The tool holder is connected to the linear motion mechanism via a connecting plate; The upper end face of the connecting plate is provided with a through connecting hole, and one side end face of the connecting plate is provided with a groove. The groove is through in the vertical direction, and the tool holder is inserted into the groove.

4. The device for removing old sealing components from a sucker well polished rod seal according to claim 3, characterized in that, The tool holder is composed of two semi-circular pieces that are axially inserted and joined together. The outer wall of the tool holder is provided with a slot, which is used to engage with the groove.

5. The device for removing old sealing components from a polished rod seal in an oil well according to claim 4, characterized in that, The two semi-circular structures are symmetrical about the axis center. One of the semi-circular structures has an axial through-hole at one end and a locking post at the other end. The locking hole and the end face of the semi-circular structure partially overlap to form an opening. The locking pin can be inserted into the locking hole of the other semicircle, and the locking hole can engage with the locking pin of the other semicircle. A connecting hole is provided on the lower end face of the semi-circular body, and the connecting hole is connected to the upper end of the hook knife.

6. The device for removing old sealing components from a sucker well polished rod seal according to claim 5, characterized in that, The opening width of the card hole is smaller than the diameter of the card hole; the width of the connection between the card post and the semi-circular body is smaller than the opening width of the card hole.

7. The device for removing old sealing components from a sucker well polished rod seal according to claim 1, characterized in that, The linear motion mechanism includes a drive box, in which a driving member and a driven member are disposed. The driving member drives the driven member to move linearly. The driven member is a moving rod, and the lower end of the driven member is connected to a connecting plate. The drive box has a first optical rod clamping surface on its end face parallel to the linear movement direction of the follower. The optical rod connector includes a fixed chuck, and the fixed chuck has a second optical rod clamping surface. The fixed chuck is connected to the fixed chuck via a connector. The first optical rod clamping surface and the second optical rod clamping surface face each other to clamp the optical rod.

8. The device for removing old sealing components from a sucker well polished rod seal according to claim 7, characterized in that, The driving component is a gear, the driven component is a rack, and the gear meshes with the rack; The gear is rotatably connected to the drive box, and the shaft of the gear extends out of the drive box and is provided with a connecting handle; A connecting post is provided at the lower end of the rack. The connecting post passes through the connecting hole of the connecting plate and is connected to a nut. The connecting post has a step, and the nut presses the connecting plate tightly against the step.

9. A device for removing old sealing components from a polished rod seal in an oil well according to claim 7, characterized in that, Both the first and second optical rod clamping surfaces have semi-circular inner walls and are provided with anti-slip grooves.

10. A device for removing old sealing components from a sucker well polished rod seal according to claim 7, characterized in that, The drive box is provided with positioning studs on both sides of the first optical rod clamping surface, and the fixing chuck is provided with positioning holes on both sides of the second optical rod clamping surface. The positioning studs pass through the positioning holes and are connected to nuts.

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