Slip casing head convenient to install and using method thereof

Abstract

The invention relates to the technical field of casing heads, in particular to a slip casing head convenient to install and a using method thereof. The slip casing head comprises a shell and a slip hanger hung in the shell, the slip hanger sequentially comprises two equally-divided supporting seats, a sealing ring and a slip seat from bottom to top, a slip insert is arranged in the slip seat, the top of the slip insert is a plane, the outer side wall of the slip insert is a smooth inclined plane matched with the inner side wall of the slip seat, and the slip insert is connected with the supporting seats. A rotary ring is rotatably arranged at the top of the slip bowl, the rotary ring is locked in the circumferential direction and is in threaded connection with a lifting ring, the lifting ring is locked in the circumferential direction and can vertically slide down along the inner wall of the slip bowl to press the slip insert, and the rotary ring and the lifting ring are each divided into two equal parts. The slip hanger is convenient to mount, flexible in excitation and suspension, wide in application range and good in 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 convenient for installation and its usage method. Background Art

[0002] A casing head is an important connecting component between the casing and the wellhead device, used to fix the wellhead of the drilled well, connect the wellhead casing string, seal the annular space between each layer of casings, provide a transition connection for installing a blowout preventer, tubing head, and Christmas tree, and through two side ports on the casing head body, construction operations such as mud squeezing, monitoring, and filling of balance fluid can be carried out. A slip casing head refers to a casing head equipped with a slip hanger. The lower end of a conventional slip casing head is connected to the surface casing through threads or an inverted slip hanger, and the inside is connected to the technical casing or production casing through a slip hanger. During the installation and use of the slip casing head, the installation of the slip hanger is particularly complex. When installing the slip hanger, there is a casing head housing below and wellhead devices such as a blowout preventer or Christmas tree above. Due to obstacles at both the upper and lower ends, the operating space for installing the slip hanger is small. Currently, many slip hangers need to manually activate the sealing ring through several screws for sealing, which is difficult to operate in a narrow space, increasing the installation difficulty and reducing the installation efficiency.

[0003] The patent with the application number CN 200620077844.7 discloses a single-cone surface slip hanger. The mating surface between the slip teeth and the slip housing is designed as a single-cone surface. The slip housing is installed on the support seat, the sealing ring is installed on the support seat and is in contact with the lower end surface of the slip housing, and handles are respectively provided on the slip housing and the support seat. The mating surface between the slip teeth and the casing is designed with an inverted tooth-shaped closing tooth surface, and the casing contact surface is engaged through the inverted tooth-shaped closing tooth surface, thereby reliably suspending the casing. The single-cone surface mating of the above single-cone surface slip hanger is easy to align, and the pressure borne by the cone surface is evenly distributed when bearing the weight of the casing string, which is convenient for installation. However, the above technical solution has the following problems: First, it can only rely on the casing hanging weight to activate the suspension of the hanger for the casing. When installing, the casing needs to be lifted and lowered, which is not applicable to construction situations such as old well repair where the casing has been cemented and thus cannot be lifted, and the applicable range is narrow; second, the slip teeth are not axially locked. In heavy oil thermal recovery wells, when the casing expands thermally, the axial elongation is obvious, and the casing will drive the slip teeth to move upward, resulting in the suspension failure of the slip hanger and affecting construction safety.

[0004] In summary, there is an urgent need to provide a slip casing head that is convenient for installation, has a flexible activation and suspension of the slip hanger, a wide applicable range, and good suspension stability. Summary of the Invention

[0005] To solve at least one of the above technical problems, the present invention provides a slip casing head that is easy to install, including a housing and a slip hanger seated in the housing. The slip hanger successively includes a support seat divided into two equal parts, a sealing ring, and a slip seat from bottom to top. The slip seat is internally provided with slip teeth. The top of the slip teeth is a flat surface, and the outer sidewall is a smooth inclined surface that matches the inner sidewall of the slip seat. A rotating ring is rotatably provided at 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 vertically slide down along the inner wall of the slip seat to press the slip teeth. Both the rotating ring and the lifting ring are divided into two equal parts.

[0006] Preferably, the support seat includes an annular support seat body seated in the housing. The upper end surface of the support seat body is coaxially provided with a first annular insertion block. Two through holes are circumferentially equidistantly provided on the sidewall of the first annular insertion block. The dividing line of the support seat passes through the two through holes. The lower end surface of the slip seat is provided with a first annular slot corresponding to the first annular insertion block, and a setscrew groove is circumferentially provided on the outer sidewall.

[0007] Preferably, the sealing ring includes an outer ring and an inner ring. The outer ring is sleeved on the outer sidewall of the first annular insertion block, and the inner ring is sleeved on the inner sidewall of the first annular insertion block. A connecting section corresponding to the through hole is provided between the outer ring and the inner ring. The dividing line of the sealing ring passes through the two connecting sections.

[0008] Preferably, the outer sidewall of the slip teeth is provided with an annular circumferential groove. The slip teeth are divided into four equal parts, and a positioning block is fixedly provided in the circumferential groove of each part of the slip teeth. The free end of the positioning block can be inserted into the circumferential groove of the adjacent part of the slip teeth.

[0009] Preferably, the inner sidewall of the rotating ring is rotatably fitted with the casing. The outer sidewall includes a rotating part and a threaded part from top to bottom. The sidewall of the rotating part is provided with an annular flange. The upper end surface of the slip seat is provided with a rotating groove that matches the rotating part, and a flange groove corresponding to the annular flange is provided on the sidewall of the rotating groove.

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

[0011] Preferably, the lifting ring is circular. Two guiding sliders are circumferentially equidistantly provided on the outer sidewall, and a thread is provided on the inner sidewall. The dividing line of the lifting ring is away from the guiding sliders. A guiding chute that matches the guiding sliders is vertically provided on the inner sidewall of the slip seat. A docking end of one part of the lifting ring is provided with a plug-in block, and a docking end of the other part of the lifting ring is provided with a plug-in slot 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: Step S100: lift the sleeve and fit the housing onto the outside of the sleeve; 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; 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; 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; 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.

[0015] Compared with the prior art, the present invention has the following beneficial technical effects: 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. 2. The two-equal-part structure in the slip hanger can quickly install the slip hanger when there are obstacles above and below. In addition, the slip seat and the support seat of the slip hanger can automatically squeeze and activate the sealing of the sealing ring, greatly improving the installation efficiency. 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 tightly and can effectively prevent the slip teeth from moving upward, improving the hanging stability. 4. The outer ring and the inner ring of the sealing ring are connected by a connecting section to form a whole, which not only avoids the scattering of parts but also improves the installation efficiency. 5. The inner side wall of the rotating ring can be rotatably fitted with the casing, enabling the rotating ring to straighten the casing and improving the installation efficiency. 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, facilitating subsequent installation operations and improving the installation efficiency. 7. The upper end face of the rotating ring is provided with a connecting ring, which can drive the rotating ring to rotate and can make the two-equal-part rotating ring be closely butted. In addition, the second annular insert block of the connecting ring is inserted into the second annular slot of the slip seat. When the equal division lines of the connecting ring and the support seat are staggered with the equal division line of the slip seat, the slip seat can be locked from the upper and lower ends, greatly improving the docking stability of the slip seat. 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 to misalign the strip-shaped flange of the positioning rod with the strip-shaped hole of the second positioning hole, then the rotating ring and the connecting ring can be axially locked, improving the structural stability of the slip hanger. In summary, the present invention is convenient for installation, the slip hanger activates and hangs flexibly, has a wide application range, and has good hanging stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is Figure 1 the A-A sectional view of Figure 3 is a schematic structural diagram of the slip hanger; Figure 4 is a schematic structural diagram of the support seat; Figure 5 is a schematic structural diagram of the sealing ring; ! Figure 6 is a schematic structural diagram of the slip teeth; Figure 7 is a schematic structural diagram of the slip seat; Figure 8 is a schematic structural diagram of the rotating ring; Figure 9 is a schematic structural diagram of the lifting ring; Figure 10 Structural schematic diagram of the positioning rod; Figure 11 Structural schematic diagram of the connecting ring; Figure 12 is Figure 3 B-B sectional view of Figure 13 Structural schematic diagram of the pre-assembled slip hanger; Figure 14 is Figure 13 C-C sectional view of

[0017] Explanation of reference numerals in the drawings: 1. Housing, 11. Hanger seat hanging cavity, 12. Communication cavity, 13. Surface casing insertion cavity, 14. Side hole, 15. Upper flange, 16. Lower flange, 17. Set screw, 2. Slip hanger, 21. Support seat, 211. Support seat body, 212. First annular insert block, 213. Through hole, 22. Sealing ring, 221. Outer ring, 222. Inner ring, 223. Connection section, 23. Slip seat, 231. First annular slot, 232. Set screw groove, 233. Guide chute, 234. Rotation groove, 2341. Flange groove, 235. First positioning hole, 236. Second annular slot, 24. Slip teeth, 241. Circumferential groove, 242. Positioning block, 25. Rotating ring, 251. Rotating part, 2511. Ring-shaped flange, 252. Threaded part, 253. Second positioning hole, 254. Circular groove, 26. Lifting ring, 261. Guide slider, 262. Insertion block, 263. Insertion slot, 27. Positioning rod, 271. Head, 272. Rod part, 273. Strip-shaped flange, 28. Connecting ring, 281. Third positioning hole, 282. Second annular insert block. Specific embodiments

[0018] The following describes the specific embodiments of the present invention in conjunction with the drawings and embodiments: It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementation conditions of the present invention. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should fall within the scope covered by the technical content disclosed in the present invention.

[0019] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope in which the present invention can be implemented. Embodiment 1

[0020] Combined with the attached Figures 1 to 14 , this embodiment provides a slip casing head that is easy to install, including a housing 1 and a slip hanger 2 seated in the housing 1. The slip hanger 2 sequentially includes a support seat 21 divided into two equal parts, a sealing ring 22, and a slip seat 23 from bottom to top. A slip tooth 24 is provided inside the slip seat 23. The top of the slip tooth 24 is a flat surface, 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 at 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 along the inner wall of the slip seat 23 to press the slip tooth 24 tightly. Both the rotating ring 25 and the lifting ring 26 are divided into two equal parts.

[0021] In the above technical solution, the housing 1 can adopt a conventional structure in the prior art, such as Figure 2As shown in the figure, inside the housing 1, there are respectively provided with a hanger seat hanging cavity 11, a communication cavity 12, and a surface casing insertion cavity 13 from top to bottom. On the circumferential side wall, two side holes 14 are equidistantly arranged. At the top, there is an upper flange 15, and at the bottom, there is a lower flange 16. On the upper flange 15, a number of set screws 17 for axially locking the slip hanger 2 are equidistantly arranged in the circumferential direction. For the parts not mentioned otherwise, conventional settings in the prior art are adopted. It should be noted that in the prior art, the structures of the housings 1 of slip casing heads are diverse and are not limited to the structure shown in this embodiment as long as the slip hanger 2 can be properly seated and hung. The support seat 21 and the sealing ring 22 of the slip hanger 2 can directly adopt the structure in the patent application No. CN200620077844.7. The slip hanger 2 is used to hang the casing, and this casing 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. Dividing into two equal parts means cutting the part into two symmetrical parts along a radial line, which is beneficial for the smooth installation of the slip hanger 2 when there are obstacles both above and below. Axial locking of the rotating ring 25 means that the rotating ring 25 can only rotate circumferentially and cannot move up and down. Circumferential locking of the lifting ring 26 means that the lifting ring 26 can only move up and down and 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 rotating directions. During installation and use: ① Lift the casing and sleeved the housing 1 outside the casing; ② Assemble the support seat 21, the sealing ring 22, the slip seat 23, the slip teeth 24, the rotating ring 25, and the lifting ring 26 together so that the dividing lines of the support seat 21, the sealing ring 22, the slip seat 23, the rotating ring 25, and the lifting ring 26 coincide to obtain a pre-assembled slip hanger 2; ③ Hold the pre-assembled slip hanger 2 against the outer side wall of the casing, and then rotate the support seat 21. The support seat 21 drives the sealing ring 22 to rotate synchronously until the dividing lines of the support seat 21 and the sealing ring 22 intersect and lock with the dividing line of the slip seat 23 to obtain a locked slip hanger 2; ④ Lower the locked slip hanger 2 into the housing 1. The support seat 21 is seated and hung on the housing 1. Use the set screw 17 to press the slip seat 23 of the slip hanger 2. Lower the casing, and drive the slip teeth 24 to move downward by the casing hanging weight to initially hold the casing tightly; ⑤ 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 to move downward to further hold the casing tightly, completing the hanging of the casing. When encountering a construction situation where the casing cannot be lifted or lowered, just cancel the operations of lifting and lowering the casing in the above steps.

[0022] The slip casing head in this embodiment can not only rely on the casing hanging weight to activate the hanging of the casing by the slip hanger 2, but also drive the lifting ring 26 to press down the slip teeth 24 by rotating the rotating ring 25 of the slip hanger 2 to activate the hanging of the casing by the slip hanger 2. With dual hanging activation, the hanging stability of the slip casing head for the casing can be greatly improved. In addition, dual hanging activation is applicable to both the construction situations where the casing can be lifted and lowered and those where the casing cannot be lifted and lowered (such as old well repair), with a wide range of applications. The two-equal-part structure in the slip hanger 2 enables the quick installation of the slip hanger 2 when there are obstacles both above and below. In addition, the slip seat and the support seat of the slip hanger can automatically squeeze and activate the sealing of the sealing ring, greatly improving the installation efficiency. The contact area between the lifting ring 26 and the slip teeth 24 is large, and the downward pressure is uniform, which can make the slip teeth 24 fully hold the casing tightly and effectively prevent the slip teeth 24 from moving upward, improving the hanging stability.

[0023] In a specific technical solution, the support seat 21 includes an annular support seat body 211 seated in the housing 1. The upper end face of the support seat body 211 is coaxially provided with a first annular insertion block 212. Two through holes 213 are circumferentially and equidistantly arranged on the side wall of the first annular insertion block 212. The equal division line of the support seat 21 passes through the two through holes 213. The lower end face of the slip seat 23 is provided with a first annular slot 231 corresponding to the first annular insertion block 212, and a setscrew groove 232 is arranged on the outer side wall in the circumferential direction.

[0024] In the above technical solution, the support seat 21 is seated in the housing 1. Therefore, a tapered inclined surface matching the inner wall of the housing 1 is provided on the outer side wall of the support seat 21, which is common knowledge and will not be elaborated here. The first annular insertion block 212 of the support seat 21 can pass through the sealing ring 22 and be inserted into the first annular slot 231. By rotating the support seat 21 to make the equal division line of the support seat 21 intersect with the equal division line of the slip seat 23, the support seat 21 and the slip seat 23 can be locked simultaneously, and the two-half support seat 21 and slip seat 23 can be butted together. When installing the slip hanger 2, for the convenience of operation, auxiliary tools, namely the support seat handle and the slip seat handle, are usually equipped (see Figure 13 and Figure 14), two radial slots are equidistantly arranged on the circumferential outer wall of the support base 21. The bisector of the support base 21 is away from the radial slots (that is, the radial slots on each part of the support base 21 are located at the arc top). The two support base handles are inserted into the two radial slots, and rotating the support base handle along the axial direction of the support base 21 can drive the support base 21 to rotate; in this embodiment, the slips 24 are equally divided into four parts (in the prior art, the slips 24 are usually equally divided into two or four parts). Four first radial insertion holes are equidistantly arranged on the circumferential side wall of the slip seat 23 (the number of the first radial insertion holes is the same as the number of equal parts of the slips 24). The first radial insertion holes do not intersect with the bisector of the slip seat 23. Four second radial insertion holes are equidistantly arranged on the circumferential side wall of the slips 24. The second radial insertion holes do not intersect with the bisector of the slips 24. In this way, it can be ensured that each part of the slips 24 has a second radial insertion hole, and the slip seat handle can be inserted into the first radial insertion hole and the second radial insertion hole at the same time, so that the slips 24 are fixed in the initial position and do not generate a clamping force on the casing. When it is necessary to lower the slip hanger 2 into the interior of the housing 1, the support base handle and the slip seat handle are removed.

[0025] 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 insert block 212, the inner ring 222 is sleeved on the inner side wall of the first annular insert block 212, a connecting section 223 corresponding to the through hole 213 is arranged 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.

[0026] In the above technical solution, the outer ring 221 and the inner ring 222 of the sealing ring 22 are connected by the connecting section 223 to form a whole, which not only avoids the scattering of parts, but also improves the installation efficiency; the outer ring 221 can seal the gap between the slip hanger 2 and the housing 1, and the inner ring 222 can seal the gap between the slip hanger 2 and the casing.

[0027] In a specific technical solution, a circumferential groove 241 is arranged on the outer side wall of the slips 24. The slips 24 are equally divided into four parts, and a positioning block 242 is fixedly arranged in the circumferential groove 241 of each part of the slips 24. The free end of the positioning block 242 can be inserted into the circumferential groove 241 of the adjacent part of the slips 24.

[0028] In the above technical solution, the four positioning blocks 242 can make the four parts of the slips 24 lift and lower synchronously.

[0029] In a specific technical solution, the inner sidewall of the rotating ring 25 is rotatably fitted with the casing. The outer sidewall includes a rotating portion 251 and a threaded portion 252 from top to bottom. A ring-shaped flange 2511 is provided on the sidewall of the rotating portion 251. An upper end face of the slip seat 23 is provided with a rotating groove 234 that cooperates with the rotating portion 251. A flange groove 2341 corresponding to the ring-shaped flange 2511 is provided on the sidewall of the rotating groove 234.

[0030] In the above technical solution, the inner sidewall of the rotating ring 25 is rotatably fitted with the casing, which has a centralizing effect on the casing. The rotating portion 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.

[0031] In a specific technical solution, two first positioning holes 235 are symmetrically provided on both sides of the bisector of the rotating groove 234. Two second positioning holes 253 are symmetrically provided on both sides of the bisector of the rotating ring 25. The positioning rod 27 can be inserted into the first positioning holes 235 and the second positioning holes 253.

[0032] In the above technical solution, when the positioning rod 27 is inserted into the first positioning holes 235 and the second positioning holes 253, the rotating ring 25 can be temporarily locked on the slip seat 23, which is convenient for subsequent installation operations.

[0033] In a specific technical solution, the lifting ring 26 is circular. Two guiding sliders 261 are equidistantly arranged on the outer sidewall in the circumferential direction. Threads are provided on the inner sidewall. The bisector of the lifting ring 26 is away from the guiding sliders 261. A guiding chute 233 that cooperates with the guiding sliders 261 is vertically provided on the inner sidewall of the slip seat 23. A plug-in block 262 is provided at the docking end of one part of the lifting ring 26. A plug-in slot 263 corresponding to the plug-in block 262 is provided at the docking end of the other part of the lifting ring 26.

[0034] In the above technical solution, the bisector of the lifting ring 26 is away from the guiding sliders 261. Therefore, the guiding sliders 261 are located on the midline of the bisector (i.e., at the arc top of each part of the lifting ring 26). Correspondingly, the guiding chute 233 on the slip seat 23 is also located on the midline of the bisector of the slip seat 23. The guiding sliders 261 and the guiding chute 233 cooperate with each other, which can circumferentially lock the lifting ring 26 and the slip seat 23, preventing the lifting ring 26 from rotating circumferentially along the slip seat 23. The plug-in block 262 and the plug-in slot 263 cooperate with each other, which can ensure the synchronous lifting of the two parts of the lifting ring 26.

[0035] In a specific technical solution, a two-equal-part connection ring 28 is coaxially provided on the upper end surface of the rotating ring 25. A third positioning hole 281 corresponding to the second positioning hole 253 is provided on the connection ring 28, and a second annular insertion block 282 is provided on the lower end surface. The bisecting line of the rotating ring 25 is away from the second positioning hole 253. A second annular slot 236 corresponding to the second annular insertion block 282 is provided on the upper end surface of the slip seat 23.

[0036] 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 bisecting line of the connection ring 28 and the bisecting line of the rotating ring 25 are in an interleaved state. The connection ring 28 can make the two-equal-part rotating ring 25 be tightly butted, and can make the rotating ring 25 rotate synchronously with the connection ring 28. The second annular insertion block 282 of the connection ring 28 is inserted into the second annular slot 236 of the slip seat 23, so that the bisecting line of the connection ring 28 and the bisecting line of the slip seat 23 are in an interleaved state, which can make the two-equal-part slip seat 23 be tightly butted. The bottom of the two-equal-part slip seat 23 is locked by the support seat 21, and the top is locked by the connection ring 28, which can further improve the butt joint stability of the slip seat 23. For the convenience of rotation, two screwing grooves are equidistantly arranged on the circumference of the upper end surface of the connection ring 28. The screwing grooves are staggered with the bisecting line of the connection ring 28. Insert a rotating tool, and the connection ring 28 can be quickly rotated. It should be noted that if the slip hanger 2 does not have the rotating ring 25, the screwing grooves are directly arranged on the upper end surface of the rotating ring 25.

[0037] In a specific technical solution, the positioning rod 27 includes a head 271 and a cylindrical rod portion 272. A strip-shaped flange 273 extends upward from the lower end surface of the rod portion 272. A circular groove 254 for accommodating the strip-shaped flange 273 is provided on the lower end surface of the rotating ring 25. 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-shaped hole corresponding to the strip-shaped flange 273.

[0038] 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-shaped flange 273 is exactly located in the circular groove 254, and the upper end surface of the strip-shaped flange 273 is closely attached to the upper end surface of the circular groove 254. At this time, rotate the positioning rod 27 to make the strip-shaped flange 273 rotate in the circular groove 254 and be misaligned with the strip-shaped hole of the second positioning hole 253, and the rotating ring 25 and the connection ring 28 can be axially locked to improve the connection stability of the equipment. To ensure a compact structure, in this embodiment, a counterbore for accommodating the head 271 is provided on the upper end surface of the third positioning hole 281; a screwing groove for inserting a screwing tool is provided on the upper end surface of the head 271 to facilitate screwing the positioning rod 27.

[0039] The installation and use process of this embodiment is as follows: ① Lift the casing, and sleeved the housing 1 on the outside of the casing; ② Assemble the support seat 21, the sealing ring 22, the slip seat 23, the slip teeth 24, the rotating ring 25 and the lifting ring 26 together, so that the dividing lines of the support seat 21, the sealing ring 22, the slip seat 23, the rotating ring 25 and the lifting ring 26 coincide. Then insert the positioning rod 27 into the slip seat 23 and the rotating ring 25 to circumferentially lock the two, obtaining the pre-assembled slip hanger 2 (see Figure 13 and Figure 14 ); ③ Hold the pre-assembled slip hanger 2 against the outer wall of the casing, and then rotate the support seat 21. The support seat 21 drives the sealing ring 22 to rotate synchronously until the dividing lines of the support seat 21 and the sealing ring 22 intersect and lock with the dividing line of the slip seat 23, obtaining the locked slip hanger 2; ④ Lower the locked slip hanger 2 into the housing 1. The support seat 21 is seated on the housing 1, and the setscrew 17 presses the slip seat 23 of the slip hanger 2. Lower the casing, and drive the slip teeth 24 to move downward by the weight of the casing to initially hold the casing tightly; ⑤ First, remove the positioning rod 27, install the connecting ring 28 above the rotating ring 25. The dividing lines of the connecting ring 28 and the rotating ring 25 intersect. Then insert the positioning rod 27 into the connecting ring 28 and the rotating ring 25, and rotate the positioning rod 27 to lock the connecting ring 28 and the rotating ring 25. At the same time, the second annular insert block 282 of the connecting ring 28 is inserted into the second annular slot 236 of the slip seat 23, and the dividing lines of the connecting ring 28 and the slip seat 23 intersect and lock. Finally, rotate the connecting ring 28 and the rotating ring 25 to drive the lifting ring 26 threaded with the rotating ring 25 to move downward. The lifting ring 26 pushes the slip teeth 24 to move downward to further hold the casing tightly, completing the suspension of the casing. It should be noted that in the construction situation where the casing cannot be lifted and lowered, only the operations of lifting and lowering the casing in the above operation process need to be cancelled. Embodiment 2

[0040] This embodiment provides a method for using a slip casing head that is convenient for installation, including the following steps: Step S100: Lift the casing, and sleeved the housing 1 on the outside of the casing; Step S200: Assemble the support seat 21, the sealing ring 22, the slip seat 23, the slip teeth 24, the rotating ring 25 and the lifting ring 26 together, so that the dividing lines of the support seat 21, the sealing ring 22, the slip seat 23, the rotating ring 25 and the lifting ring 26 coincide, obtaining the pre-assembled slip hanger 2; Step S300: Hold the pre-assembled slip hanger 2 against the outer wall of the casing, and then rotate the support seat 21. The support seat 21 drives the sealing ring 22 to rotate synchronously until the dividing lines of the support seat 21 and the sealing ring 22 intersect and lock with the dividing line of the slip seat 23, obtaining the locked slip hanger 2; Step S400: Lower the locked slip hanger 2 into the housing 1. The support seat 21 is seated on the housing 1, and the slip seat 23 of the slip hanger 2 is pressed tightly with the setscrew 17. Lower the casing, and drive the slip teeth 24 to move downward to initially hold the casing tightly through the weight of the casing in suspension. 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 to move downward to further hold the casing tightly, thus completing the suspension of the casing.

[0041] The above embodiments are the preferred embodiments of the present invention. However, the embodiments of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. A slip casing head convenient for installation, comprising a housing (1) and a slip hanger (2) seated and suspended within the housing (1), characterized in that, The slip hanger (2) successively includes a support seat (21) divided into two equal parts, a sealing ring (22), and a slip seat (23) from bottom to top. A slip tooth (24) is arranged inside the slip seat (23). The top of the slip tooth (24) is a plane, and the outer side wall is a smooth inclined plane that matches the inner side wall of the slip seat (23). A rotating ring (25) is rotatably arranged at the top of the slip seat (23). The rotating ring (25) is circumferentially locked and threadedly connected to a lifting ring (26). The lifting ring (26) is circumferentially locked and can vertically slide down along the inner wall of the slip seat (23) to press the slip tooth (24). Both the rotating ring (25) and the lifting ring (26) are divided into two equal parts. The outer side wall of the rotating ring (25) successively includes a rotating part (251) and a threaded part (252) from top to bottom. A ring-shaped flange (2511) is arranged on the side wall of the rotating part (251). A rotating groove (234) that matches the rotating part (251) is arranged on the upper end surface of the slip seat (23). A flange groove (2341) corresponding to the ring-shaped flange (2511) is arranged on the side wall of the rotating groove (234).

2. The slip casing head according to claim 1, wherein The support seat (21) includes an annular support seat body (211) seated in the housing (1). A first annular insert block (212) is coaxially arranged on the upper end surface of the support seat body (211). Two through holes (213) are circumferentially equidistantly arranged on the side wall of the first annular insert block (212). The bisecting line of the support seat (21) passes through the two through holes (213). A first annular slot (231) corresponding to the first annular insert block (212) is arranged on the lower end surface of the slip seat (23), and a setscrew groove (232) is circumferentially arranged on the outer side wall.

3. The slip casing head according to claim 2, wherein 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 insert block (212), and the inner ring (222) is sleeved on the inner side wall of the first annular insert block (212). A connecting section (223) corresponding to the through hole (213) is arranged between the outer ring (221) and the inner ring (222). The bisecting line of the sealing ring (22) passes through the two connecting sections (223).

4. The slip casing head according to claim 3, characterized in that, An annular circumferential groove (241) is arranged on the outer side wall of the slip tooth (24). The slip tooth (24) is divided into four equal parts, and a positioning block (242) is fixedly arranged in the circumferential groove (241) of each part of the slip tooth (24). The free end of the positioning block (242) can be inserted into the circumferential groove (241) of the adjacent part of the slip tooth (24).

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

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

7. The slip casing head 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. A slip casing head convenient for installation 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 according to claim 8, wherein 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 convenient for installation, 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: 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 grip the casing, completing the suspension of the casing.

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