A slip casing head that is easy to install and its use method

Abstract

The present invention relates to the technical field of casing heads, and in particular to a slip casing head that is easy to install and a method for using the same. The slip casing head includes a shell and a slip hanger mounted in the shell. The slip hanger includes a support seat, a sealing ring, and a slip seat in two equal parts from bottom to top. A slip tooth is provided inside the slip seat. The top of the slip tooth is flat, and the outer wall is a smooth inclined surface that matches the inner wall of the slip seat. A rotating ring is rotatably provided on the top of the slip seat. The rotating ring is circumferentially locked and threadedly connected to a lifting ring. The lifting ring is circumferentially locked and can slide vertically down along the inner wall of the slip seat to press the slip tooth. The rotating ring and the lifting ring are both divided into two equal parts. The present invention is easy to install, the slip hanger is flexible in activating suspension, has a wide range of applications, and has good suspension stability.

Description

Technical Field

[0001] The present invention relates to the technical field of casing heads, and in particular to a slip casing head that is easy to install and a use method thereof. Background Art

[0002] The casing head is a crucial connector between the casing and the wellhead. It secures the wellhead, connects the wellhead casing string, seals the annular space between layers of casing, and provides a transitional connection for the installation of blowout preventers, tubing heads, and Christmas trees. Two side ports on the casing head body allow for operations such as slurry injection, monitoring, and the addition of balancing fluid. A slip head is a casing head equipped with a slip hanger. Conventional slip heads connect to the surface casing at the bottom through threads or an inverted slip hanger, and internally connect to the technical or reservoir casing through a slip hanger. The installation of a slip head is particularly complex. During installation, the casing head housing is located below, and the wellhead, such as a blowout preventer or Christmas tree, is located above. Obstructions at both ends create limited access for the slip hanger. Currently, many slip hangers require manual activation of the sealing ring using several screws, making them difficult to operate in confined spaces, increasing installation complexity and reducing efficiency.

[0003] Patent application number CN 200620077844.7 discloses a single-cone slip hanger. The mating surface between the slip teeth and the slip housing is designed as a single cone. The slip housing is mounted on a support base, and the sealing ring is mounted on the support base and contacts the lower end surface of the slip housing. Handles are provided on the slip housing and the support base. The mating surface between the slip teeth and the casing is designed with an inverted tooth-shaped closed tooth surface, which engages the contact surface of the casing, thereby reliably suspending the casing. The single-cone surface of the above-mentioned single-cone slip hanger is easy to align, and the pressure on the cone surface when bearing the weight of the casing string is evenly distributed, which is convenient for installation. However, the above-mentioned technical solution has the following problems: First, the hanger can only rely on the hanging weight of the casing to stimulate the suspension of the casing. The casing needs to be lifted and lowered during installation. It is not suitable for construction situations such as old well repair where cementing has been completed and the casing cannot be lifted, and the scope of application is narrow; secondly, the slip teeth are not axially locked. In heavy oil thermal recovery wells, the axial elongation of the casing is obvious when it expands due to heat. The casing will drive the slip teeth upward, resulting in suspension failure of the slip hanger, affecting construction safety.

[0004] In summary, there is an urgent need to provide a slip casing head that is easy to install, has flexible slip hanger excitation and suspension, has a wide range of applications, and has good suspension stability. Summary of the Invention

[0005] In order to solve at least one of the above-mentioned technical problems, the present invention provides a cava casing head that is easy to install, including a shell and a cava hanger hung in the shell, the cava hanger includes a support seat, a sealing ring and a cava seat in two equal parts from bottom to top, a cava tooth is provided inside the cava seat, the top of the cava tooth is flat, and the outer wall is a smooth inclined surface that matches the inner wall of the cava seat, the top of the cava seat is rotatably provided with a rotating ring, the rotating ring is circumferentially locked and threadedly connected to a lifting ring, the lifting ring is circumferentially locked and can slide vertically along the inner wall of the cava seat to press the cava tooth, and the rotating ring and the lifting ring are both divided into two equal parts.

[0006] Preferably, the support seat includes an annular support seat body hung in the shell, the upper end face of the support seat body is coaxially provided with a first annular plug, the side wall of the first annular plug is circumferentially provided with two through holes equidistantly provided, the bisector of the support seat passes through the two through holes, the lower end face of the cava seat is provided with a first annular slot corresponding to the first annular plug, and the outer side wall is circumferentially provided with a top screw groove.

[0007] Preferably, the sealing ring includes an outer ring and an inner ring, the outer ring is sleeved on the outer side wall of the first annular plug-in block, and the inner ring is sleeved on the inner side wall of the first annular plug-in block. A connecting section corresponding to the through hole is provided between the outer ring and the inner ring, and the bisector of the sealing ring passes through the two connecting sections.

[0008] Preferably, the outer wall of the cava tooth is provided with an annular circumferential groove, the cava tooth is divided into four equal parts, and a positioning block is fixedly arranged in the circumferential groove of each cava tooth, and the free end of the positioning block can be inserted into the circumferential groove of an adjacent cava tooth.

[0009] Preferably, the inner side wall of the rotating ring is rotatably fitted with the sleeve, and the outer side wall includes a rotating part and a threaded part from top to bottom. The side wall of the rotating part is provided with an annular flange, and the upper end face of the cava seat is provided with a rotating groove that cooperates with the rotating part, and the side wall of the rotating groove is provided with a flange groove corresponding to the annular flange.

[0010] Preferably, two first positioning holes are symmetrically provided on both sides of the bisecting line of the rotating groove, and two second positioning holes are symmetrically provided on both sides of the bisecting line of the rotating ring, and the positioning rod can be inserted into the first positioning hole and the second positioning hole.

[0011] Preferably, the lifting ring is in the shape of a circular ring, two guide sliders are equidistantly provided on the circumference of the outer wall, and the inner wall is provided with a thread. The bisector of the lifting ring is away from the guide slider, and a guide groove that cooperates with the guide slider is vertically provided on the inner wall of the cava seat. The butt joint end of one lifting ring is provided with a plug-in block, and the butt joint end of the other lifting ring is provided with a plug-in groove corresponding to the plug-in block.

[0012] Preferably, the upper end face of the rotating ring is coaxially provided with two equally divided connecting rings, the connecting ring is provided with a third positioning hole corresponding to the second positioning hole, the lower end face is provided with a second annular plug-in block, the bisecting line of the rotating ring is away from the second positioning hole, and the upper end face of the cava seat is provided with a second annular slot corresponding to the second annular plug-in block.

[0013] Preferably, the positioning rod includes a head and a cylindrical rod portion, the lower end surface of the rod portion is provided with a strip flange extending upward, the lower end surface of the rotating ring is provided with a circular groove for accommodating the strip flange, and the positioning rod can only be inserted into the first positioning hole and the second positioning hole or the second positioning hole and the third positioning hole at the same time, and the first positioning hole, the second positioning hole and the third positioning hole all include a circular hole corresponding to the rod portion and a strip hole corresponding to the strip flange.

[0014] The present invention provides a method for using a slip casing head that is easy to install, comprising the following steps:

[0015] Step S100: lift the sleeve and fit the housing onto the outside of the sleeve;

[0016] Step S200: Assemble the support base, the sealing ring, the slip base, the slip teeth, the rotating ring, and the lifting ring so that the bisecting lines of the support base, the sealing ring, the slip base, the rotating ring, and the lifting ring coincide, thereby obtaining a preassembled slip hanger;

[0017] Step S300: The pre-assembled slip hanger is engaged with the outer wall of the casing, and then the support seat is rotated, which drives the sealing ring to rotate synchronously until the bisector of the support seat and the sealing ring intersects and locks with the bisector of the slip seat, thereby obtaining a locked slip hanger;

[0018] Step S400: lower the locked slip hanger into the housing, hang the support seat on the housing, press the slip seat of the slip hanger with a jackscrew, lower the casing, and drive the slip teeth downward to initially hold the casing tightly by the casing hanging weight;

[0019] Step S500: Rotate the rotating ring to drive the lifting ring threadedly connected to the rotating ring to move downward. The lifting ring pushes the slip teeth downward to further hold the casing, thereby completing the suspension of the casing.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] 1. The slip casing head can not only rely on the casing hanging weight to activate the slip hanger to suspend the casing, but also rotate the rotating ring of the slip hanger to drive the lifting ring to press down the slip teeth to activate the slip hanger to suspend the casing. The double suspension activation can greatly improve the suspension stability of the slip casing head. In addition, the double suspension activation is applicable to both construction conditions where the casing can be lifted and lowered, and construction conditions where the casing cannot be lifted and lowered, thus expanding the scope of application.

[0022] 2. The two-part structure of the slip hanger enables quick installation even when there are obstacles above and below. In addition, the slip seat and support seat of the slip hanger can automatically squeeze and activate the sealing ring, greatly improving installation efficiency.

[0023] 3. The contact area between the lifting ring and the slip teeth is large, and the downward pressure is uniform, which can make the slip teeth fully hold the casing and effectively prevent the slip teeth from moving up, thereby improving the suspension stability;

[0024] 4. The outer ring and inner ring of the sealing ring are connected to form a whole through the connecting section, which not only avoids the scattering of parts but also improves the installation efficiency;

[0025] 5. The inner wall of the rotating ring and the casing can be rotated and fitted, so that the rotating ring can straighten the casing, improving the installation efficiency

[0026] 6. The positioning rod can be inserted into the first positioning hole and the second positioning hole to temporarily lock the rotating ring on the slip seat, which facilitates subsequent installation operations and improves installation efficiency;

[0027] 7. A connecting ring is provided on the upper end surface of the rotating ring. The connecting ring can drive the rotating ring to rotate and enable the two equally divided rotating rings to be tightly docked. In addition, the second annular plug of the connecting ring is inserted into the second annular slot of the slip seat. When the bisecting line of the connecting ring and the support seat intersects with the bisecting line of the slip seat, the slip seat can be locked from both ends, greatly improving the docking stability of the slip seat.

[0028] 8. Insert the positioning rod into the second positioning hole of the rotating ring and the third positioning hole of the connecting ring, and rotate the positioning rod so that the strip flange of the positioning rod is misaligned with the strip hole of the second positioning hole. This will axially lock the rotating ring and the connecting ring, improving the structural stability of the slip hanger;

[0029] In summary, the present invention is easy to install, the slip hanger can flexibly excite the suspension, has a wide range of applications, and has good suspension stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of the present invention;

[0031] Figure 2 for Figure 1AA cross-section of

[0032] Figure 3 Schematic diagram of the structure of the slip hanger;

[0033] Figure 4 It is a structural diagram of the support seat;

[0034] Figure 5 Schematic diagram of the structure of the sealing ring;

[0035] Figure 6 This is a schematic diagram of the structure of Kavaya;

[0036] Figure 7 This is a structural diagram of the slip seat;

[0037] Figure 8 is a structural diagram of a rotating ring;

[0038] Figure 9 Schematic diagram of the structure of the lifting ring;

[0039] Figure 10 Schematic diagram of the structure of the positioning rod;

[0040] Figure 11 Schematic diagram of the structure of the connecting ring;

[0041] Figure 12 for Figure 3 BB cross-section diagram;

[0042] Figure 13 It is a schematic diagram of the structure of the pre-assembled slip hanger;

[0043] Figure 14 for Figure 13 CC cross-section diagram.

[0044] Description of reference numerals:

[0045] 1. Shell, 11. Hanger seat hanging cavity, 12. Connecting cavity, 13. Surface casing plug-in cavity, 14. Side hole, 15. Upper flange, 16. Lower flange, 17. Top screw, 2. Slip hanger, 21. Support seat, 211. Support seat body, 212. First annular plug, 213. Through hole, 22. Sealing ring, 221. Outer ring, 222. Inner ring, 223. Connecting section, 23. Slip seat, 231. First annular slot, 232. Top screw slot, 233. Guide slot, 234. Rotation slot, 2341. Flange slot, 2 35. First positioning hole, 236. Second annular slot, 24. Cava tooth, 241. Circumferential groove, 242. Positioning block, 25. Rotating ring, 251. Rotating portion, 2511. Annular flange, 252. Threaded portion, 253. Second positioning hole, 254. Circular groove, 26. Lifting ring, 261. Guide slider, 262. Plug-in block, 263. Plug-in slot, 27. Positioning rod, 271. Head, 272. Rod portion, 273. Strip flange, 28. Connecting ring, 281. Third positioning hole, 282. Second annular plug-in block. DETAILED DESCRIPTION

[0046] The specific implementation of the present invention is described below with reference to the accompanying drawings and embodiments:

[0047] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose that can be achieved by the present invention.

[0048] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships should be regarded as the scope of implementation of the present invention without substantially changing the technical content. Example 1

[0049] Combined with attachment Figures 1 to 14The present embodiment provides a slip casing head that is easy to install, including a shell 1 and a slip hanger 2 hung in the shell 1, the slip hanger 2 includes a support seat 21, a sealing ring 22 and a slip seat 23 divided into two equal parts from bottom to top, and a slip tooth 24 is provided inside the slip seat 23. The top of the slip tooth 24 is flat, and the outer wall is a smooth inclined surface that matches the inner wall of the slip seat 23. A rotating ring 25 is rotatably provided on the top of the slip seat 23. The rotating ring 25 is axially locked and threadedly connected to a lifting ring 26. The lifting ring 26 is circumferentially locked and can slide vertically down along the inner wall of the slip seat 23 to press the slip tooth 24. The rotating ring 25 and the lifting ring 26 are both divided into two equal parts.

[0050] In the above technical solution, the housing 1 can adopt a conventional structure in the prior art, such as Figure 2As shown, the shell 1 is provided with a hanger seat hanging cavity 11, a communicating cavity 12 and a surface casing plug-in cavity 13 from top to bottom, two side holes 14 are equidistantly provided on the side wall circumference, an upper flange 15 is provided on the top, and a lower flange 16 is provided on the bottom. A plurality of top screws 17 for axially locking the slip hanger 2 are equidistantly provided on the upper circumference of the upper flange 15. The rest of the parts not mentioned are all conventionally set in the prior art. It should be noted that the shell 1 of the slip casing head in the prior art has various structures and is not limited to the structure shown in this embodiment, as long as the slip hanger 2 can be normally hung; the support seat 21 of the slip hanger 2 and the sealing The ring 22 can directly adopt the structure of the application number CN200620077844.7. The slip hanger 2 is used to hang the casing, which is usually a technical casing or an oil layer casing. The support seat 21, the sealing ring 22, the slip seat 23, the rotating ring 25 and the lifting ring 26 of the slip hanger 2 are all divided into two equal parts. The two equal parts refer to cutting the parts into two symmetrical parts along a radial line. The two equal parts are conducive to the smooth installation of the slip hanger 2 when there are obstacles above and below. The axial locking of the rotating ring 25 means that the rotating ring 25 can only rotate circumferentially and cannot move up and down. The circumferential locking of the lifting ring 26 means that the lifting ring 26 can only It can move up and down but cannot rotate circumferentially. When the rotating ring 25 is manually driven to rotate, the lifting ring 26 threadedly connected to the rotating ring 25 will rise or fall according to the different rotation directions. When installing and using, ① lift the casing and put the shell 1 on the outside of the casing; ② assemble the support seat 21, sealing ring 22, slip seat 23, slip teeth 24, rotating ring 25 and lifting ring 26 together, so that the bisecting lines of the support seat 21, sealing ring 22, slip seat 23, rotating ring 25 and lifting ring 26 coincide to obtain a pre-assembled slip hanger 2; ③ hug the pre-assembled slip hanger 2 to the outer wall of the casing, and then rotate the support seat 2 1. The support seat 21 drives the sealing ring 22 to rotate synchronously until the bisecting line of the support seat 21 and the sealing ring 22 is locked with the bisecting line of the slip seat 23, and the locked slip hanger 2 is obtained; ④ The locked slip hanger 2 is lowered into the shell 1, the support seat 21 is hung on the shell 1, and the slip seat 23 of the slip hanger 2 is pressed with the top screw 17, and the casing is lowered. The slip teeth 24 are driven downward by the casing hanging weight to initially hold the casing; ⑤ The rotating ring 25 is rotated to drive the lifting ring 26 threadedly connected to the rotating ring 25 to move downward. The lifting ring 26 pushes the slip teeth 24 downward to further hold the casing, completing the hanging of the casing. When encountering a construction situation where the casing cannot be lifted or lowered, just cancel the operation of lifting and lowering the casing in the above steps.

[0051] The cava casing head in this embodiment can not only stimulate the suspension of the casing by the weight of the casing, but also can stimulate the suspension of the casing by the cava hanger 2 by rotating the rotating ring 25 of the cava hanger 2, driving the lifting ring 26 to press the cava teeth 24 downward to stimulate the suspension of the casing by the cava hanger 2. The double suspension excitation can greatly improve the suspension stability of the cava casing head on the casing. In addition, the double suspension excitation is suitable for construction conditions where the casing can be lifted and lowered, and for construction conditions where the casing cannot be lifted and lowered (such as old well repair), and has a wide range of applications; the two-part structure in the cava hanger 2 can quickly install the cava hanger 2 when there are obstacles above and below. In addition, the cava seat and support seat of the cava hanger can automatically squeeze and stimulate the sealing of the sealing ring, which greatly improves the installation efficiency; the contact area between the lifting ring 26 and the cava teeth 24 is large, and the downward pressure is uniform, which can make the cava teeth 24 fully hold the casing and effectively prevent the cava teeth 24 from moving up, thereby improving the suspension stability.

[0052] In a specific technical solution, the support seat 21 includes an annular support seat body 211 hung in the shell 1, and the upper end face of the support seat body 211 is coaxially provided with a first annular plug 212, and the side wall of the first annular plug 212 is circumferentially provided with two through holes 213, and the bisector of the support seat 21 passes through the two through holes 213, and the lower end face of the cava seat 23 is provided with a first annular slot 231 corresponding to the first annular plug 212, and the outer side wall is circumferentially provided with a top screw groove 232.

[0053] In the above technical solution, the support seat 21 is hung in the shell 1, so the outer wall of the support seat 21 will be provided with a conical inclined surface that matches the inner wall of the shell 1. This is common knowledge and will not be repeated here. The first annular plug 212 of the support seat 21 can pass through the sealing ring 22 and be inserted into the first annular slot 231. The support seat 21 is rotated so that the bisecting line of the support seat 21 and the bisecting line of the slip seat 23 are intersected, and the support seat 21 and the slip seat 23 can be locked at the same time, so that the two halves of the support seat 21 and the slip seat 23 are docked together; when installing the slip hanger 2, in order to facilitate operation, auxiliary tools such as the support seat handle and the slip seat handle are usually provided (see Figure 13 and Figure 14), two radial slots are equidistantly provided on the circumference of the outer wall of the support seat 21, and the bisecting line of the support seat 21 is away from the radial slots (that is, the radial slots on each support seat 21 are located at the top of the arc), and the two support seat handles are inserted into the two radial slots. The support seat handles can be rotated along the axial direction of the support seat 21 to drive the support seat 21 to rotate; in this embodiment, the cava teeth 24 are divided into four equal parts (in the prior art, the cava teeth 24 are usually divided into two or four equal parts), and four first radial holes are equidistantly provided on the circumference of the side wall of the cava seat 23 (the number of the first radial holes is the same as the number of the bisecting lines of the cava teeth 24 The number is consistent), the first radial socket does not intersect with the bisector of the cava seat 23, and four second radial sockets are equidistantly provided on the circumference of the side wall of the cava tooth 24, and the second radial sockets do not intersect with the bisector of the cava tooth 24. This ensures that each cava tooth 24 is provided with a second radial socket, and the cava seat handle can be inserted into the first radial socket and the second radial socket at the same time, so that the cava tooth 24 is fixed in the initial position and does not generate a clamping force on the casing. When the cava hanger 2 needs to be lowered into the interior of the shell 1, the support seat handle and the cava seat handle are removed.

[0054] In a specific technical solution, the sealing ring 22 includes an outer ring 221 and an inner ring 222. The outer ring 221 is sleeved on the outer side wall of the first annular plug-in block 212, and the inner ring 222 is sleeved on the inner side wall of the first annular plug-in block 212. A connecting section 223 corresponding to the through hole 213 is provided between the outer ring 221 and the inner ring 222, and the bisector of the sealing ring 22 passes through the two connecting sections 223.

[0055] In the above technical solution, the outer ring 221 and the inner ring 222 of the sealing ring 22 are connected to form a whole through the connecting section 223, which not only avoids the scattering of parts but also improves the installation efficiency; the outer ring 221 can seal the gap between the cava hanger 2 and the shell 1, and the inner ring 222 can seal the gap between the cava hanger 2 and the casing.

[0056] In a specific technical solution, the outer wall of the cava tooth 24 is provided with an annular circumferential groove 241, and the cava tooth 24 is divided into four equal parts. A positioning block 242 is fixedly set in the circumferential groove 241 of each cava tooth 24, and the free end of the positioning block 242 can be inserted into the circumferential groove 241 of an adjacent cava tooth 24.

[0057] In the above technical solution, the four positioning blocks 242 can enable the four slip teeth 24 to rise and fall synchronously.

[0058] In a specific technical solution, the inner side wall of the rotating ring 25 is rotatably fitted with the sleeve, and the outer side wall includes a rotating part 251 and a threaded part 252 from top to bottom. The side wall of the rotating part 251 is provided with an annular flange 2511, and the upper end face of the cava seat 23 is provided with a rotating groove 234 that cooperates with the rotating part 251, and the side wall of the rotating groove 234 is provided with a flange groove 2341 corresponding to the annular flange 2511.

[0059] In the above technical solution, the inner side wall of the rotating ring 25 can be rotatably fitted with the sleeve, which has a straightening effect on the sleeve. The rotating part 251 of the rotating ring 25 is inserted into the flange groove 2341 of the slip seat 23, which can axially lock the rotating ring 25.

[0060] In a specific technical solution, two first positioning holes 235 are symmetrically provided on both sides of the bisecting line of the rotating groove 234, and two second positioning holes 253 are symmetrically provided on both sides of the bisecting line of the rotating ring 25. The positioning rod 27 can be inserted into the first positioning hole 235 and the second positioning hole 253.

[0061] In the above technical solution, the positioning rod 27 is inserted into the first positioning hole 235 and the second positioning hole 253, which can temporarily lock the rotating ring 25 on the slip seat 23, facilitating subsequent installation operations.

[0062] In a specific technical solution, the lifting ring 26 is in a circular shape, and two guide sliders 261 are equidistantly provided on the circumference of the outer wall, and the inner wall is provided with a thread. The bisector of the lifting ring 26 is away from the guide slider 261, and a guide groove 233 that cooperates with the guide slider 261 is vertically provided on the inner wall of the cava seat 23. The docking end of one lifting ring 26 is provided with a plug-in block 262, and the docking end of the other lifting ring 26 is provided with a plug-in groove 263 corresponding to the plug-in block 262.

[0063] In the above technical solution, the bisecting line of the lifting ring 26 is far away from the guide slider 261, so the guide slider 261 is located on the center line of the bisecting line (that is, the arc top of each lifting ring 26). Correspondingly, the guide groove 233 on the cava seat 23 is also located on the center line of the bisecting line of the cava seat 23. The guide slider 261 and the guide groove 233 cooperate with each other to lock the lifting ring 26 and the cava seat 23 circumferentially to prevent the lifting ring 26 from rotating circumferentially along the cava seat 23. The plug-in block 262 and the plug-in groove 263 cooperate with each other to ensure that the two lifting rings 26 are lifted and lowered synchronously.

[0064] In a specific technical solution, the upper end face of the rotating ring 25 is coaxially provided with a connecting ring 28 divided into two equal parts, the connecting ring 28 is provided with a third positioning hole 281 corresponding to the second positioning hole 253, and the lower end face is provided with a second annular plug block 282. The bisecting line of the rotating ring 25 is away from the second positioning hole 253, and the upper end face of the cava seat 23 is provided with a second annular slot 236 corresponding to the second annular plug block 282.

[0065] In the above technical solution, when the positioning rod 27 is inserted into the third positioning hole 281 and the second positioning hole 253, the bisector of the connecting ring 28 and the bisector of the rotating ring 25 are in an interlaced state, and the connecting ring 28 can make the two equally divided rotating rings 25 tightly docked, and can make the rotating ring 25 rotate synchronously with the connecting ring 28; the second annular plug 282 of the connecting ring 28 is inserted into the second annular slot 236 of the cava seat 23, so that the bisector of the connecting ring 28 and the bisector of the cava seat 23 are in an interlaced state, which can make the two equally divided cava seats 23 tightly docked, and the bottom of the two equally divided cava seats 23 are locked by the support seat 21, and the top is locked by the connecting ring 28, which can further improve the docking stability of the cava seat 23. In order to facilitate rotation, two screwing grooves are equidistantly arranged on the circumference of the upper end face of the connecting ring 28. The screwing grooves are staggered with the bisector of the connecting ring 28. By inserting a rotating tool, the connecting ring 28 can be quickly rotated. It should be noted that if the cava hanger 2 is not provided with a rotating ring 25, the screwing grooves are directly set on the upper end face of the rotating ring 25.

[0066] In a specific technical solution, the positioning rod 27 includes a head 271 and a cylindrical rod portion 272, the lower end surface of the rod portion 272 is provided with a strip flange 273 extending upward, and the lower end surface of the rotating ring 25 is provided with a circular groove 254 for accommodating the strip flange 273. The positioning rod 27 can only be inserted into the first positioning hole 235 and the second positioning hole 253 or the second positioning hole 253 and the third positioning hole 281 at the same time. The first positioning hole 235, the second positioning hole 253 and the third positioning hole 281 all include a circular hole corresponding to the rod portion 272 and a strip hole corresponding to the strip flange 273.

[0067] In the above technical solution, when the positioning rod 27 is inserted into the second positioning hole 253 and the third positioning hole 281, the strip flange 273 is just located in the circular groove 254, and the upper end surface of the strip flange 273 is close to the upper end surface of the circular groove 254. At this time, the positioning rod 27 is rotated to make the strip flange 273 rotate in the circular groove 254 and be misaligned with the strip hole of the second positioning hole 253, so as to axially lock the rotating ring 25 and the connecting ring 28, thereby improving the connection stability of the equipment; in order to ensure a compact structure, in this embodiment, the upper end surface of the third positioning hole 281 is provided with a countersunk hole for accommodating the head 271; the upper end surface of the head 271 is provided with a screwing groove for inserting a screwing tool, which is convenient for screwing the positioning rod 27.

[0068] The installation and use process of this embodiment is as follows: ① lift the casing and put the shell 1 on the outside of the casing; ② assemble the support seat 21, sealing ring 22, slip seat 23, slip teeth 24, rotating ring 25 and lifting ring 26 together, so that the bisecting lines of the support seat 21, sealing ring 22, slip seat 23, rotating ring 25 and lifting ring 26 coincide, and then insert the positioning rod 27 into the slip seat 23 and rotating ring 25 to circumferentially lock the two, and obtain the pre-assembled slip hanger 2 (see Figure 13 and Figure 14 ); ③ The pre-assembled slip hanger 2 is engaged with the outer wall of the casing, and then the support seat 21 is rotated. The support seat 21 drives the sealing ring 22 to rotate synchronously until the bisecting line of the support seat 21 and the sealing ring 22 is intersected and locked with the bisecting line of the slip seat 23, and the locked slip hanger 2 is obtained; ④ The locked slip hanger 2 is lowered into the shell 1, the support seat 21 is hung on the shell 1, the top screw 17 presses the slip seat 23 of the slip hanger 2, and the casing is lowered. The slip teeth 24 are driven downward by the casing hanging weight to initially hold the casing; ⑤ First take out the positioning rod 27, and install the connecting ring 28 on the rotating Above the ring 25, the bisectors of the connecting ring 28 and the rotating ring 25 are staggered, and then the positioning rod 27 is inserted into the connecting ring 28 and the rotating ring 25. The positioning rod 27 is rotated to lock the connecting ring 28 and the rotating ring 25. At the same time, the second annular plug 282 of the connecting ring 28 is inserted into the second annular slot 236 of the slip seat 23. The bisectors of the connecting ring 28 and the slip seat 23 are staggered and locked. Finally, the connecting ring 28 and the rotating ring 25 are rotated to drive the lifting ring 26 threadedly connected to the rotating ring 25 to move downward. The lifting ring 26 pushes the slip teeth 24 downward to further hold the casing, completing the suspension of the casing. It should be noted that in the construction situation where the casing cannot be lifted and lowered, it is only necessary to cancel the operation of lifting and lowering the casing during the above operation. Example 2

[0069] This embodiment provides a method for using a slip casing head that is easy to install, comprising the following steps:

[0070] Step S100: lift the sleeve and fit the housing 1 onto the outside of the sleeve;

[0071] Step S200, assemble the support base 21, the sealing ring 22, the slip base 23, the slip teeth 24, the rotating ring 25 and the lifting ring 26 so that the bisectors of the support base 21, the sealing ring 22, the slip base 23, the rotating ring 25 and the lifting ring 26 coincide with each other, thereby obtaining a preassembled slip hanger 2;

[0072] Step S300: The preassembled slip hanger 2 is engaged with the outer wall of the casing, and then the support base 21 is rotated, which drives the sealing ring 22 to rotate synchronously until the bisector of the support base 21 and the sealing ring 22 intersects and locks with the bisector of the slip base 23, thereby obtaining a locked slip hanger 2;

[0073] Step S400: Lower the locked slip hanger 2 into the housing 1, hang the support seat 21 on the housing 1, press the slip seat 23 of the slip hanger 2 with the jackscrew 17, lower the casing, and drive the slip teeth 24 downward through the casing suspension weight to initially hold the casing;

[0074] Step S500: Rotate the rotating ring 25 to drive the lifting ring 26 threadedly connected to the rotating ring 25 to move downward. The lifting ring 26 pushes the slip teeth 24 downward to further hold the casing, thereby completing the suspension of the casing.

[0075] The above embodiments are preferred implementations of the present invention, but the implementation of the present invention is not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A slip casing head that is easy to install, comprising a housing (1) and a slip hanger (2) mounted in the housing (1), characterized in that: The slip hanger (2) includes, from bottom to top, a support seat (21) divided into two equal parts, a sealing ring (22) and a slip seat (23). A slip tooth (24) is provided inside the slip seat (23). The top of the slip tooth (24) is a plane, and the outer side wall is a smooth inclined surface that matches the inner side wall of the slip seat (23). A rotating ring (25) is rotatably provided on the top of the slip seat (23). The rotating ring (25) is circumferentially locked and is threadedly connected to a lifting ring (26). The lifting ring (26) is circumferentially locked and can be moved along the slip seat. The inner wall of the (23) slides down vertically to press the cava teeth (24), and the rotating ring (25) and the lifting ring (26) are both divided into two equal parts; the outer wall of the rotating ring (25) includes a rotating part (251) and a threaded part (252) from top to bottom, and the side wall of the rotating part (251) is provided with an annular flange (2511), and the upper end surface of the cava seat (23) is provided with a rotating groove (234) that cooperates with the rotating part (251), and the side wall of the rotating groove (234) is provided with a flange groove (2341) corresponding to the annular flange (2511).

2. The slip casing head that is easy to install according to claim 1, characterized in that: The support seat (21) comprises an annular support seat body (211) mounted in the shell (1); a first annular plug (212) is coaxially provided on the upper end face of the support seat body (211); two through holes (213) are equidistantly provided on the side wall of the first annular plug (212); a bisector of the support seat (21) passes through the two through holes (213); a first annular slot (231) corresponding to the first annular plug (212) is provided on the lower end face of the cava seat (23); and a top screw groove (232) is circumferentially provided on the outer side wall.

3. The slip casing head that is easy to install according to claim 2, characterized in that: The sealing ring (22) comprises an outer ring (221) and an inner ring (222), wherein the outer ring (221) is sleeved on the outer side wall of the first annular plug-in block (212), and the inner ring (222) is sleeved on the inner side wall of the first annular plug-in block (212), and a connecting section (223) corresponding to the through hole (213) is provided between the outer ring (221) and the inner ring (222), and a bisector of the sealing ring (22) passes through the two connecting sections (223).

4. The slip casing head that is easy to install according to claim 3, characterized in that: The outer wall of the kava tooth (24) is provided with an annular circumferential groove (241), and the kava tooth (24) is divided into four equal parts. A positioning block (242) is fixedly provided in the circumferential groove (241) of each kava tooth (24), and the free end of the positioning block (242) can be inserted into the circumferential groove (241) of an adjacent kava tooth (24).

5. The slip casing head that is easy to install according to claim 4, characterized in that: The inner side wall of the rotating ring (25) is rotatably fitted to the sleeve.

6. The slip casing head that is easy to install according to claim 5, characterized in that: Two first positioning holes (235) are symmetrically provided on both sides of the bisecting line of the rotating groove (234), and two second positioning holes (253) are symmetrically provided on both sides of the bisecting line of the rotating ring (25). The positioning rod (27) can be inserted into the first positioning hole (235) and the second positioning hole (253).

7. The slip casing head that is easy to install according to claim 6, characterized in that: The lifting ring (26) is in the shape of a ring, and two guide sliders (261) are equidistantly provided on the circumference of the outer wall, and the inner wall is provided with a thread. The bisecting line of the lifting ring (26) is away from the guide slider (261), and a guide groove (233) that matches the guide slider (261) is vertically provided on the inner wall of the cava seat (23). The butt end of one lifting ring (26) is provided with a plug-in block (262), and the butt end of the other lifting ring (26) is provided with a plug-in groove (263) corresponding to the plug-in block (262).

8. The slip casing head easy to install according to claim 7, characterized in that: The upper end surface of the rotating ring (25) is coaxially provided with a connecting ring (28) divided into two equal parts. The connecting ring (28) is provided with a third positioning hole (281) corresponding to the second positioning hole (253). The lower end surface is provided with a second annular plug block (282). The bisecting line of the rotating ring (25) is away from the second positioning hole (253). The upper end surface of the cava seat (23) is provided with a second annular slot (236) corresponding to the second annular plug block (282).

9. The slip casing head that is easy to install according to claim 8, characterized in that: The positioning rod (27) includes a head (271) and a cylindrical rod portion (272), the lower end surface of the rod portion (272) is provided with a strip-shaped flange (273) extending upward, and the lower end surface of the rotating ring (25) is provided with a circular groove (254) for accommodating the strip-shaped flange (273). The positioning rod (27) can only be inserted into the first positioning hole (235) and the second positioning hole (253) or the second positioning hole (253) and the third positioning hole (281) at the same time, and the first positioning hole (235), the second positioning hole (253) and the third positioning hole (281) all include a circular hole corresponding to the rod portion (272) and a strip-shaped hole corresponding to the strip-shaped flange (273).

10. A method for using a slip casing head that is easy to install, characterized in that: Using the slip casing head that is easy to install according to claim 1 includes the following steps: Step S100: lift the sleeve and fit the shell (1) onto the outside of the sleeve; Step S200, assembling the support base (21), the sealing ring (22), the slip base (23), the slip teeth (24), the rotating ring (25) and the lifting ring (26) so that the bisectors of the support base (21), the sealing ring (22), the slip base (23), the rotating ring (25) and the lifting ring (26) coincide with each other, thereby obtaining a pre-assembled slip hanger (2); Step S300, the pre-assembled slip hanger (2) is engaged with the outer wall of the casing, and then the support seat (21) is rotated, and the support seat (21) drives the sealing ring (22) to rotate synchronously until the bisector of the support seat (21) and the sealing ring (22) is intersected and locked with the bisector of the slip seat (23), thereby obtaining a locked slip hanger (2); Step S400, lower the locked slip hanger (2) into the housing (1), hang the support seat (21) on the housing (1), press the slip seat (23) of the slip hanger (2) with the top screw (17), lower the casing, and drive the slip teeth (24) downward to initially hold the casing by the casing hanging weight; Step S500, rotating the rotating ring (25), driving the lifting ring (26) threadedly connected to the rotating ring (25) to move downward, the lifting ring (26) pushes the slip teeth (24) to move downward to further hold the casing, and completes the hanging of the casing.

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