Thin-wall short fish top annular slip fisher capable of being sleeved and milled
By designing the structure of thin-walled annular tiles and conical surface extrusion deformation clamping and torque transmission keys, the problem of close fish top clamping point, large size and small ring space gap in oil underground salvage is solved, and the salvage success rate and efficiency are improved.
Patent Information
- Application Number
- CN202422133065.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-18
- Estimated Expiration
- 2034-09-02
AI Technical Summary
During the oil underground salvage process, the fish top is very close to the fish top and the catch point, the fish top is very small above the joint, the fish top size is large and the ring space gap is small, and the fish pipe column is seriously stuck, the salvage is frequently failed, and the reverse operation requirements are high, resulting in a high salvage failure rate.
A thin-walled short fish top ring casing salvage is designed, including an upper joint, a shell guide shoe and an annular varnish. The shell guide shoe has a milled tooth structure, an alloy teeth on the inside of the ring casing and a tapered surface on the outside. The fish is clamped by extrusion deformation of the conical surface, and the torque transmission key and the shoe guide keyway are used to transmit torque to achieve inverted operation.
It improves the salvage success rate, simplifies the trimming and salvage process, and only needs to be drained into the well once, which is more efficient than traditional methods.
Smart Images
Figure CN223119886U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of downhole fishing in oil wells, in particular to a milling thin-wall short fish head ring-type slip fishing tool. Background Art
[0002] Accidents of pipe strings and tools falling into oil and gas wells are increasing. During the fishing process, situations often occur where the fish head is very close to the stuck point, or the length of the fish head above the coupling is very small, the fish head size is large while the annular clearance is small, the fallen fish pipe string is severely stuck, and the fish head is deformed and damaged and needs to be repaired before fishing. As a result, the problem of "fishing failure" frequently occurs in the fishing work.
[0003] The back-off method is to make the back-off pipe or rod exactly at the neutral point under the action of the upward pulling force. In this way, this pipe or rod is in a stress state where it is neither pulled nor compressed. Then, a reverse torque is applied to the un-stuck pipe string. The torque acts on the coupling of the stuck pipe string through the un-stuck pipe string, causing the pipe or rod to uncouple and separate from the stuck pipe string. Then, the back-off fishing pipe string is lifted to take out the uncoupled pipe or rod string. The key of the back-off method lies in accurately finding the position of the neutral point. Finding the position of the neutral point is the key to the success or failure of back-off. The above operations often require experienced old masters to operate. Even experienced old masters will also have the problem of "fishing failure", especially in some situations where the fish head is very close to the stuck point, the length of the fish head above the coupling is very small, the fish head size is large while the annular clearance is small, and the fallen fish pipe string is severely stuck. Therefore, the utility model provides a milling thin-wall short fish head ring-type slip fishing tool to ensure the success rate of fishing. Content of the Utility Model
[0004] In view of the deficiencies of the prior art, the utility model provides a milling thin-wall short fish head ring-type slip fishing tool, which solves the problems that "fishing failure" frequently occurs when the fish head is very close to the stuck point, or the length of the fish head above the coupling is very small, the fish head size is large while the annular clearance is small, and the fallen fish pipe string is severely stuck; the fish head needs to be repaired before fishing; the back-off operation has high requirements and "fishing failure" also frequently occurs.
[0005] To achieve the above objectives, the utility model is realized through the following technical solutions: A milling thin-wall short fish head ring-type slip fishing tool, comprising:
[0006] An upper sub, the top end of the upper sub is fixedly installed with a fishing pipe string;
[0007] A housing guide shoe, the housing guide shoe is fixedly installed at the bottom of the upper sub. A plurality of annularly distributed milling teeth structures are installed at the bottom of the housing guide shoe. An inner taper surface of the guide shoe is opened near the bottom end on the inner side of the housing guide shoe, and a guide shoe keyway is opened on the side surface of the housing guide shoe;
[0008] The annular slips, the wall thickness of the annular slips is 5-8 mm, several annularly distributed alloy teeth are fixedly connected to the inner side of the annular slips, a slips gap and a slips through groove are opened at the top of the annular slips, the number of the slips gaps is one less than the number of the alloy teeth, the positions of the slips gap and the slips through groove correspond to those of the alloy teeth one by one, a slips outer cone surface parallel to the inner conical surface of the guide shoe and with a diameter smaller than the inner conical surface of the guide shoe is opened on the outer side surface of the annular slips, and a torque transmission key is fixedly connected to the side surface of the annular slips and inside the keyway of the guide shoe;
[0009] There are two of the guide shoe keyways and the torque transmission keys, the openings of the two guide shoe keyways are on the same straight line, and the two guide shoe keyways are symmetrical about the axial section of the annular slips passing through the slips through groove;
[0010] The height of the guide shoe keyway is greater than the height of the torque transmission key, the width of the guide shoe keyway is greater than the width of the torque transmission key, and the side extrusion contact surface of the torque transmission key and the guide shoe keyway is the surface of the inner side of the guide shoe keyway far from the slips through groove.
[0011] Preferably, the upper sub includes a body, a connection head is fixedly connected to the top end of the body, a female sub of the connection is arranged inside the connection head, an outer guide inclined surface is arranged at the connection part of the body and the connection head, a male sub is arranged on the outer side of the body and near the bottom end, an inner guide inclined surface is arranged on the inner side of the body and near the bottom end, and a water eye is arranged inside the body.
[0012] Preferably, the body and the connection head are of an integral structure.
[0013] Preferably, the shell guide shoe includes a cylinder body, an inner conical surface of the guide shoe and a female sub of the guide shoe are arranged inside the cylinder body, and the female sub of the guide shoe is above the inner conical surface of the guide shoe.
[0014] Preferably, the milling tooth structure includes an installation opening opened at the bottom end of the cylinder body, and alloy milling teeth are fixedly connected inside the installation opening.
[0015] Preferably, the annular slips include an annular body, there are six groups of the alloy teeth, there are five slips gaps, the slips through groove cuts the annular body into an arc shape, and the five slips gaps divide the top of the arc-shaped annular body into six sections;
[0016] On the outer side of the annular body, a first arc groove and a second arc groove are provided. The first arc groove is located above the second arc groove. The first arc groove connects to the first area, the second area, the third area, and the fourth area counted counterclockwise starting from the slip through groove. A first arc key is arranged on the inner side of the first arc groove. The first arc key and each area corresponding to the first arc groove are fixedly connected through first connecting pins. The second arc groove connects to the first area, the second area, the third area, and the fourth area counted clockwise starting from the slip through groove. A second arc key is arranged on the inner side of the second arc groove. The second arc key and each area corresponding to the second arc groove are fixedly connected through second connecting pins.
[0017] Preferably, the alloy teeth are reverse teeth.
[0018] Preferably, a slip circulation groove is arranged between adjacent alloy teeth on the inner side of the slip bowl.
[0019] Preferably, the torque transmission key includes a first torque transmission key and a second torque transmission key.
[0020] The utility model provides a milling thin-wall short fish head slip bowl fishing tool. It has the following beneficial effects:
[0021] 1. In the utility model, by designing a thin-wall structure slip bowl in cooperation with a conical surface, when lifting the fishing string, the outer conical surface of the slip bowl and the inner conical surface of the guide shoe are mutually extruded, causing the slip bowl to deform, and the alloy teeth tightly clamp the fish head. The design of this structure makes the clamping part of the slip bowl shorter, suitable for situations where the distance from the fish head to the stuck point is very close, the length of the fish head above the coupling is very small, the fish head size is large while the annular clearance is small, and the fallen fish string is severely stuck; the torque transmission key is fixedly connected to the side of the slip bowl, a key groove is arranged on the guide shoe of the housing, and the height of the key groove on the guide shoe is designed to be greater than the height of the torque transmission key, and the width of the key groove on the guide shoe is greater than the width of the torque transmission key, satisfying that the key groove on the guide shoe can slide up and down relative to the torque transmission key without affecting the relative sliding between the slip bowl and the guide shoe of the housing during the above clamping process. At the same time, by using the structure of the key groove on the guide shoe and the torque transmission key, the torsional moment can be transmitted to the slip bowl, so as to implement back-off. The side extrusion contact surface between the torque transmission key and the key groove on the guide shoe is the surface on the inner side of the key groove on the guide shoe far from the slip through groove. During the back-off process (when rotating), one side of the slip bowl is subjected to a relatively large force, which will further lock the slip bowl, making its connection with the fallen fish more stable. Compared with the traditional back-off method, the fishing success rate is higher.
[0022] 2. In the utility model, by designing a milling tooth structure at the bottom end of the guide shoe of the housing, it can simply trim the top of the fallen fish to facilitate fishing. Compared with the traditional trimming and fishing, it only needs to be lowered into the well once, and the fishing efficiency is higher. Brief Description of the Drawings
[0023] Figure 1 is a perspective view of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0024] Figure 2 is a front view of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0025] Figure 3 is Figure 2 a sectional view taken along the section line A-A in
[0026] Figure 4 is Figure 3 a partial enlarged view at C in
[0027] Figure 5 is Figure 2 a sectional view taken along the section line B-B in
[0028] Figure 6 is a first perspective view of the upper sub of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0029] Figure 7 is a second perspective view of the upper sub of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0030] Figure 8 is a perspective view of the shell shoe of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0031] Figure 9 is a first perspective view of the ring slip of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model;
[0032] Figure 10 is a second perspective view of the ring slip of a ring slip fishing tool for milling thin-wall short fish heads that can be milled with a sleeve proposed by the present utility model.
[0033] Among them, 1. Upper sub; 11. Body; 12. Connection part; 13. Male sub of the joint; 14. Inner guide slope; 15. Water eye; 16. Outer guide slope; 17. Female sub of the joint; 2. Shell shoe; 21. Cylinder; 22. Female sub of the shoe; 23. Inner conical surface of the shoe; 24. Installation opening; 25. Alloy milling teeth; 26. Keyway of the shoe; 3. Ring slip; 31. Ring body; 32. Outer conical surface of the slip; 33. First torque transmission key; 34. Alloy teeth; 35. Slip clearance; 36. Slip through slot; 37. Second torque transmission key; 38. First arc-shaped groove; 39. First arc-shaped key; 310. First connecting pin; 311. Second arc-shaped groove; 312. Second arc-shaped key; 313. Second connecting pin. Detailed implementation mode
[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than 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 efforts shall fall within the protection scope of the present utility model.
[0035] Embodiment 1:
[0036] As Figures 1 - 10 shown, the embodiment of the present utility model provides a milling and fishing tool for thin-walled short fish top annular slips, which includes an upper sub 1, a housing guide shoe 2 and an annular slip 3.
[0037] Among them, the top end of the upper sub 1 is fixedly installed with the fishing string, and the housing guide shoe 2 is fixedly installed at the bottom of the upper sub 1. The fishing string is used to transmit the rotation and pulling of the well tools, so as to drive the upper sub 1 and the housing guide shoe 2 to perform corresponding actions.
[0038] A number of annularly distributed milling tooth structures are installed at the bottom of the housing guide shoe 2. The milling tooth structures can be set to 16 groups. The drill string is used to drive the fishing string to rotate, drive the upper sub 1 and the housing guide shoe 2 to rotate, and the milling tooth structures are used to trim the top of the fish to facilitate the next fishing operation. An inner taper surface 23 of the guide shoe is opened on the inner side of the housing guide shoe 2 and near the bottom end, and a keyway 26 of the guide shoe is opened on the side of the housing guide shoe 2. The wall thickness of the annular slip 3 is 5-8 MM. During the fishing process, the annular slip 3 is closely attached to the inner side of the inner taper surface 23 of the guide shoe. Therefore, even for a thin-walled structure, a large fishing force can be provided. A number of annularly distributed alloy teeth 34 are fixedly connected to the inner side of the annular slip 3. The alloy teeth 34 are reverse teeth, and the material is selected as YD alloy, which can provide good biting force. A slip gap 35 and a slip through groove 36 are opened at the top end of the annular slip 3. The designs of the slip gap 35 and the slip through groove 36 are both easy for the annular slip 3 to deform. The number of slip gaps 35 is one less than the number of alloy teeth 34. The positions of the slip gap 35 and the slip through groove 36 correspond to those of the alloy teeth 34 one by one. An outer taper surface 32 of the slip is opened on the outer side of the annular slip 3, which is parallel to the inner taper surface 23 of the guide shoe and has a diameter smaller than that of the inner taper surface 23 of the guide shoe. A torque transmission key is fixedly connected to the side of the annular slip 3 and inside the keyway 26 of the guide shoe.
[0039] There are two guide shoe keyways 26 and two torque transmission keys. The openings of the two guide shoe keyways 26 are on the same straight line. The two guide shoe keyways 26 are symmetric about the axial section of the annular slip 3 passing through the slip-through slot 36. The two guide shoe keyways 26 are used in conjunction with the two torque transmission keys, which can ensure the smoothness of the relative movement in the up and down direction between the housing guide shoe 2 and the annular slip 3, and can also better transmit torque.
[0040] The height of the guide shoe keyway 26 is greater than the height of the torque transmission key, so that the torque transmission key located inside the guide shoe keyway 26 can slide up and down freely. The width of the guide shoe keyway 26 is greater than the width of the torque transmission key, and the side extrusion contact surface between the torque transmission key and the guide shoe keyway 26 is the surface of the inner side of the guide shoe keyway 26 away from the slip-through slot 36.
[0041] During the fishing process, the rotation of the drill string is transmitted by the fishing string, driving the upper sub 1 and the housing guide shoe 2 to rotate. The rotating milling tooth structure trims the fish head. Then, further control the upper sub 1 and the housing guide shoe 2 to move downward. Under the guidance of the bottom port of the housing guide shoe 2, the top of the fish is inserted into the inner side of the annular slip 3, and the annular slip 3 is pushed to move upward relative to the housing guide shoe 2 by a certain distance. At this time, the fishing string can be lifted. The upper sub 1 and the housing guide shoe 2 will move directly upward, while the annular slip 3 will generate friction with the fish and move downward relative to the housing guide shoe 2. As the lifting force increases, the relative movement amount between the annular slip 3 and the housing guide shoe 2 increases, and the inner conical surface 23 of the guide shoe squeezes the outer conical surface 32 of the slip, causing the annular slip 3 to deform (reduce in diameter), so that the annular slip 3 firmly grasps the fish.
[0042] When back-off needs to be applied, it is necessary to ensure that the lifting force of the fishing string on the fish is maintained within a small range. If the lifting force is too large, the thread connection at the coupling of the fish string is relatively tight and difficult to disassemble. It is necessary to strictly control the position of the neutral point. At this time, it is very difficult to ensure the grasping force between the annular slip 3 and the fish (the grasping force between the annular slip 3 and the fish increases with the increase of the lifting force). In the design of this structure, when driving the upper sub 1 and the housing guide shoe 2 to rotate, the rotation is transmitted by relying on the side extrusion contact surface between the torque transmission key and the guide shoe keyway 26. The acting force directly acts on one side of the annular slip 3 to rotate, and the other side follows the rotation. The annular slip 3 will also deform (reduce in diameter) during this process, so that the annular slip 3 firmly grasps the fish and ensures the success rate of back-off.
[0043] In one embodiment, the upper sub 1 includes a body 11. A sub head 12 is fixedly connected to the top end of the body 11. A female sub 17 is arranged inside the sub head 12. The female sub 17 is threadedly connected to the fishing string. An outer guide inclined surface 16 is arranged at the connection between the body 11 and the sub head 12. A male sub 13 is arranged on the outside of the body 11 and near the bottom end. The male sub 13 is used to connect the housing guide shoe 2. An inner guide inclined surface 14 is arranged on the inside of the body 11 and near the bottom end. A water eye 15 is arranged inside the body 11. The water eye 15 is used for normal water supply during circulating well flushing.
[0044] In one embodiment, the body 11 and the sub head 12 are of an integral structure to ensure the stability of the structure.
[0045] In one embodiment, the housing guide shoe 2 includes a cylinder 21. A guide shoe inner conical surface 23 and a female sub 22 of the guide shoe are arranged inside the cylinder 21. The female sub 22 of the guide shoe is located above the guide shoe inner conical surface 23. The guide shoe inner conical surface 23 corresponds to the cone surface 32 of the slip. The female sub 22 of the guide shoe is used to connect the male sub 13.
[0046] In one embodiment, the milling tooth structure includes a mounting opening 24 opened at the bottom end of the cylinder 21. An alloy milling tooth 25 is fixedly connected inside the mounting opening 24, so that the alloy milling tooth 25 can be disassembled and replaced for long-term use.
[0047] In one embodiment, the annular slip 3 includes an annular body 31. There are six groups of alloy teeth 34. There are five slip gaps 35. The slip through slots 36 cut the annular body 31 into an arc shape. The five slip gaps 35 divide the top of the arc-shaped annular body 31 into six sections.
[0048] A first arc groove 38 and a second arc groove 311 are opened on the outside of the annular body 31. The first arc groove 38 is located above the second arc groove 311. The first arc groove 38 connects the first section, the second section, the third section, and the fourth section counted counterclockwise starting from the slip through slot 36. A first arc key 39 is arranged inside the first arc groove 38. The first arc key 39 and each section corresponding to the first arc groove 38 are fixedly connected through first connecting pins 310. That is, there are also four first connecting pins 310, corresponding to the first section, the second section, the third section, and the fourth section counted counterclockwise starting from the slip through slot 36 respectively.
[0049] The second arc groove 311 connects the first section, the second section, the third section, and the fourth section counted clockwise starting from the slip through slot 36. A second arc key 312 is arranged inside the second arc groove 311. The second arc key 312 and each section corresponding to the second arc groove 311 are fixedly connected through second connecting pins 313.
[0050] Among them, starting from the slip through slot 36, the third and fourth sectors counted in the clockwise direction correspond to the fourth and third sectors counted in the clockwise direction starting from the slip through slot 36.
[0051] As Figure 5 shown in the figure, the torque transmission keys include a first torque transmission key 33 and a second torque transmission key 37, which are symmetrically distributed on both sides of the slip through slot 36. If the housing guide shoe 2 rotates clockwise, the contact part corresponding to the first torque transmission key 33 drives the annular slip 3 to rotate. If it rotates counterclockwise, the contact part corresponding to the second torque transmission key 37 drives the annular slip 3 to rotate. Rotating in the above two directions causes the annular slip 3 to deform during rotation, improving the clamping force with the fish, and ensuring the success rate of back-off.
[0052] In an embodiment, a slip circulation groove is provided inside the annular slip 3 and between two adjacent alloy teeth 34, making the alloy teeth 34 protrude inward so that they can clamp well on the fish.
[0053] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A milling and fishing tool with a thin-walled short fish head annular slip, comprising an upper sub (1), the top of the upper sub (1) is fixedly installed with a fishing string, and it is characterized in that, Further comprising: A casing guide shoe (2), the casing guide shoe (2) is fixedly installed at the bottom of the upper sub (1), several annularly distributed milling tooth structures are installed at the bottom of the casing guide shoe (2), an inner taper surface (23) of the guide shoe is provided near the bottom inside the casing guide shoe (2), and a guide shoe keyway (26) is provided on the side surface of the casing guide shoe (2); An annular slip (3), the wall thickness of the annular slip (3) is 5-8 MM, several annularly distributed alloy teeth (34) are fixedly connected inside the annular slip (3), a slip gap (35) and a slip through slot (36) are provided at the top of the annular slip (3), the number of the slip gaps (35) is one less than the number of the alloy teeth (34), the slip gaps (35) and the slip through slots (36) correspond to the positions of the alloy teeth (34) one by one, an outer taper surface (32) of the slip that is parallel to the inner taper surface (23) of the guide shoe and has a diameter smaller than that of the inner taper surface (23) is provided on the outer side surface of the annular slip (3), and a torque transmission key is fixedly connected to the side surface of the annular slip (3) and inside the guide shoe keyway (26); There are two of the guide shoe keyways (26) and the torque transmission keys, the openings of the two guide shoe keyways (26) are on the same straight line, and the two guide shoe keyways (26) are symmetric about the axial section of the annular slip (3) passing through the slip through slot (36); The height of the guide shoe keyway (26) is greater than the height of the torque transmission key, the width of the guide shoe keyway (26) is greater than the width of the torque transmission key, and the side extrusion contact surface between the torque transmission key and the guide shoe keyway (26) is the surface of the guide shoe keyway (26) that is far from the slip through slot (36) on the inner side; 2. The annular slip fishing tool for milling thin-walled short fish heads that can be milled according to claim 1, characterized in that: The upper sub (1) includes a body (11), a connection head (12) is fixedly connected to the top of the body (11), a female thread of the sub (17) is provided inside the connection head (12), an outer guide inclined surface (16) is provided at the connection between the body (11) and the connection head (12), a male thread of the sub (13) is provided on the outer side of the body (11) and near the bottom, an inner guide inclined surface (14) is provided on the inner side of the body (11) and near the bottom, and a water hole (15) is provided inside the body (11); 3. A milling sleeve thin-wall short fish head annular slip fishing tool according to claim 2, characterized in that: The body (11) and the connection head (12) are of an integral structure.
4. A milling - sleevable thin - walled short fish - top annular slip fishing tool according to claim 1, wherein: The casing guide shoe (2) includes a cylinder (21), an inner taper surface (23) and a female thread of the guide shoe (22) are provided inside the cylinder (21), and the female thread of the guide shoe (22) is above the inner taper surface (23) of the guide shoe; 5. The annular slip fishing tool for milling thin-walled short fish heads according to claim 4, wherein: The milling tooth structure includes a mounting opening (24) provided at the bottom of the cylinder (21), and an alloy milling tooth (25) is fixedly connected inside the mounting opening (24); 6. The annular slip fishing tool for milling thin-wall short fish heads that can be milled as claimed in claim 1, wherein: The annular slip (3) includes an annular body (31), there are six groups of the alloy teeth (34), five slip gaps (35) are provided, the slip through slot (36) cuts the annular body (31) into an arc shape, and the five slip gaps (35) divide the top of the arc-shaped annular body (31) into six sections; On the outer side of the annular body (31), a first arc-shaped groove (38) and a second arc-shaped groove (311) are provided. The first arc-shaped groove (38) is located above the second arc-shaped groove (311). The first arc-shaped groove (38) continuously spans the first area, the second area, the third area, and the fourth area counted counterclockwise starting from the slip through groove (36). A first arc-shaped key (39) is arranged on the inner side of the first arc-shaped groove (38). The first arc-shaped key (39) and each area corresponding to the first arc-shaped groove (38) are fixedly connected through first connecting pins (310). The second arc-shaped groove (311) continuously spans the first area, the second area, the third area, and the fourth area counted clockwise starting from the slip through groove (36). A second arc-shaped key (312) is arranged on the inner side of the second arc-shaped groove (311). The second arc-shaped key (312) and each area corresponding to the second arc-shaped groove (311) are fixedly connected through second connecting pins (313).
7. A milling reamer for thin-walled short fish head annular slip fishing tool according to claim 1, characterized in that: The alloy teeth (34) are reverse teeth.
8. The annular slip fishing tool for milling thin-walled short fish heads that can be milled and nested according to claim 1, characterized in that: A slip circulation groove is arranged on the inner side of the annular slip (3) and between two adjacent alloy teeth (34).
9. The annular slip fishing tool for milling thin-walled short fish heads according to claim 1, wherein: The torque transmission key includes a first torque transmission key (33) and a second torque transmission key (37).