Oil well casing head

Abstract

The invention relates to the field of oil field wellhead devices, and discloses an oil well casing head which comprises a casing joint body, a connecting groove is formed in the top of the casing joint body, a connecting part is slidably connected into the connecting groove, and two clamping grooves are formed in each of the left side and the right side of the connecting part. Two connecting plates are fixedly connected to the exterior of the sleeve joint body, mounting grooves are formed in the connecting plates, connecting grooves are formed in the inner side walls of the mounting grooves, pull rods are slidably connected to the interiors of the connecting grooves, and two connecting rods are rotatably connected to the outer surfaces of the pull rods; two sliding grooves are further formed in the inner side wall of the mounting groove. According to the casing head, the connecting part, the pull rod, the connecting groove, the mounting groove, the second spring, the connecting rod and other structures are additionally arranged and used in cooperation, so that the connecting part can be quickly mounted and dismounted, and the problems that mounting and dismounting are troublesome and time is wasted due to multi-bolt connection of a traditional casing head are solved.

Description

Technical Field

[0001] The invention relates to the field of oil field wellhead devices, in particular to an oil well casing head. Background Art

[0002] The casing head is mainly used to hang and seal the casing string, and to perform mud circulation, cementing, testing and other operations through the side outlet. The casing hanger is located in the casing head. Generally speaking, the diameter of the lower part of the casing hanger is larger than the inner diameter of the casing head, so that the casing hanger can be stuck in the casing head, and a sealing device is set between the casing hanger and the inner wall of the casing head at the clamping point. The lower end of the casing hanger is connected to the casing. Due to changes in the pressure in the well or temperature changes due to thermal expansion and contraction, the casing will move up. The upward movement of the casing will drive the casing hanger to move up together, making the seal at the clamping point between the casing hanger and the casing head ineffective. In actual use, in order to prevent the casing hanger from moving up, the upper part of the casing hanger is generally provided with an inclined surface, and a top screw with a conical end is provided on the casing head. The conical surface of the top screw presses on the inclined surface of the casing hanger to limit the upward movement of the casing hanger. Traditionally, casing heads are fixed to wellheads by multiple bolts. This multi-bolt connection method brings many inconveniences to the installation and removal of casing heads, the most notable of which is time-consuming. Therefore, technicians in this field have proposed an oil well casing head to solve the above problems. Summary of the invention

[0003] In view of the deficiencies of the prior art, the present invention provides an oil well casing head, which solves the problem that the casing head and the wellhead are mostly connected and fixed by many bolts, which makes it inconvenient to disassemble.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oil well casing head, including a casing joint body, a connecting groove is provided on the top of the casing joint body, a connecting part is slidably connected inside the connecting groove, two card grooves are provided on the left and right sides of the connecting part, two connecting plates are fixedly connected to the outside of the casing joint body, an installation groove is provided inside the connecting plate, a connecting groove is provided on the inner side wall of the installation groove, a pull rod is slidably connected inside the connecting groove, and the outer surface of the pull rod is rotatably connected to two connecting rods, and two sliding grooves are provided on the inner side wall of the installation groove, a movable plate is slidably connected inside the slide groove, a second spring is fixedly connected to one side of the movable plate, and a card block is fixedly connected to the other side of the movable plate, a locking assembly is installed on the outside of the pull rod, and a buffer assembly is installed on the outside of the casing joint body.

[0005] Preferably, the buffer assembly includes a plurality of mounting shells, and the plurality of mounting shells are fixedly connected to the outside of the sleeve joint body, the interior of the mounting shell is fixedly connected with a sliding rod, the exterior of the sliding rod is slidably connected with two sliding blocks, the exterior of the sliding block is hinged, and the other end is hinged with a protective plate, and the exterior of the sliding rod is sleeved with a first spring.

[0006] Preferably, the longitudinal section of the protective plate is arranged to be arc-shaped, and the upper and lower ends of the first spring are respectively fixedly connected to the outside of the slider at corresponding positions.

[0007] Preferably, the locking assembly comprises two fixing plates and fixing grooves, the two fixing plates are fixedly connected to the outside of the connecting plate, the fixing grooves are formed on the outer surface of the pull rod, a threaded groove is formed inside the fixing plates, and a positioning pin is provided inside the fixing groove.

[0008] Preferably, the shape of the fixing groove matches the shape of the positioning pin, and the outer surface of the fixing plate is provided with an external thread matching the thread groove.

[0009] Preferably, the longitudinal section of the card block is set to be square, and the card block and the card slot are plug-fitted.

[0010] Preferably, one end of the second spring away from the movable plate is fixedly connected to the inner wall of the slide groove, and the other end of the connecting rod is rotatably connected to the outside of the movable plate.

[0011] Preferably, the shape of the connecting portion matches the connecting groove, and a rubber ring is provided on the outer surface of the connecting portion.

[0012] Preferably, the longitudinal section of the slider is arranged to be square, and the outer surface of the slider is slidably connected to the inner wall of the mounting shell.

[0013] A method for using an oil well casing head comprises the following steps: Step 1: When the connection part needs to be docked, first pull the pull rod outward to make the pull rod move along the inner wall of the connecting groove. At this time, under the action of the traction force of the connecting rod, the movable plate moves along the inner wall of the slide groove, and the second spring is compressed. At this time, the connecting part is inserted into the connecting groove at the top of the sleeve joint body, and the pull rod is released. Under the elastic force of the second spring, the clamping block moves outward until the clamping block is clamped into the clamping groove, and the installation of the connecting part is completed; Step 2: After the installation is completed, the positioning pin is rotated so that the positioning pin moves along the inner wall of the threaded groove until one end of the positioning pin penetrates into the fixing groove provided inside the pull rod, thereby fixing the pull rod and ensuring the stability of the connection during installation; Step three, in addition, during the use of the sleeve joint body, when it is hit by an external object, the object will first contact the outer surface of the protective plate. At this time, the protective plate transfers the impact force to the swing rod. At this time, under the action of the traction force of the swing rod, the slider moves along the outer surface of the slide rod, so that the first spring is in a compressed state, and the impact energy of the external object is converted into elastic potential energy of the first spring for energy consumption, thereby improving the service life of the sleeve joint body.

[0014] The present invention provides an oil well casing head, which has the following beneficial effects: 1. The present invention can quickly install and disassemble the connecting part by adding connecting parts, pull rods, connecting grooves, installation grooves, second springs, connecting rods and other structures to cooperate with each other, thereby solving the problem that the traditional casing head is troublesome and time-consuming to install and disassemble due to multiple bolt connections. At the same time, the locking assembly is provided to ensure the stability during the installation process. The overall structural design is novel and the use effect is good.

[0015] 2. The present invention can protect the casing joint body by adding a mounting shell, a sliding rod, a slider, a first spring, a connecting rod, a protective plate and other structures that cooperate with each other, thereby greatly improving the service life of the casing joint body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of the present invention; Figure 2 It is a schematic diagram of the structure of the protective plate of the present invention; Figure 3 for Figure 2 The enlarged view of point A in the middle; Figure 4 It is a top cross-sectional view of the casing joint body of the present invention; Figure 5 for Figure 1 Enlarged view of point C in the middle; Figure 6 for Figure 4 Enlarged view of point B in the middle.

[0017] Among them, 1. sleeve joint body; 201. mounting shell; 202. slide rod; 203. slider; 204. first spring; 205. swing rod; 206. protective plate; 301. connecting part; 302. pull rod; 303. connecting groove; 304. mounting groove; 305. second spring; 306. connecting rod; 307. clamping groove; 308. clamping block; 309. movable plate; 310. connecting groove; 311. connecting plate; 312. slide groove; 401. fixing plate; 402. positioning pin; 403. fixing groove; 404. threaded groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings of the present invention specification to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Example: Please see attached Figure 1 , Attachment Figure 4 and attached Figure 6 The embodiment of the present invention provides an oil well casing head, including a casing joint body 1, a connecting groove 310 is provided on the top of the casing joint body 1, a connecting part 301 is slidably connected inside the connecting groove 310, two card grooves 307 are provided on the left and right sides of the connecting part 301, two connecting plates 311 are fixedly connected to the outside of the casing joint body 1, a mounting groove 304 is provided inside the connecting plate 311, a connecting groove 303 is provided on the inner side wall of the mounting groove 304, a pull rod 302 is slidably connected inside the connecting groove 303, two connecting rods 306 are rotatably connected to the outer surface of the pull rod 302, two sliding grooves 312 are further provided on the inner side wall of the mounting groove 304, a movable plate 309 is slidably connected inside the sliding groove 312, a second spring 305 is fixedly connected to one side of the movable plate 309, a card block 308 is fixedly connected to the other side of the movable plate 309, a locking assembly is installed on the outside of the pull rod 302, and a buffer assembly is installed on the outside of the casing joint body 1.

[0020] Specifically, the pull rod 302 is pulled outward, so that the pull rod 302 drives the connecting rod 306 to swing, so that the movable plate 309 moves along the inner wall of the slide groove 312. At this time, the connecting part 301 is inserted into the connecting groove 310 at the top of the casing joint body 1, and the pull rod 302 is released. Under the elastic force of the second spring 305, the clamping block 308 moves outward until the clamping block 308 is clamped into the clamping groove 307, and the installation of the connecting part 301 is completed, thereby solving the problem that the installation and disassembly of the traditional casing head is troublesome and time-consuming due to the multi-bolt connection. At the same time, the locking assembly is set to ensure the stability during the installation process. The overall structural design is novel and the use effect is good. The role of the slide groove 312 ensures the stability of the movable plate 309 and the second spring 305 during the movement. The role of the connecting groove 303 can ensure that the pull rod 302 can move along the inner wall of the connecting groove 303.

[0021] Please see attached Figure 2 -Attached Figure 3The buffer assembly includes a plurality of mounting shells 201, and the plurality of mounting shells 201 are fixedly connected to the outside of the sleeve joint body 1. A slide rod 202 is fixedly connected to the inside of the mounting shell 201. Two sliders 203 are slidably connected to the outside of the slide rod 202. A swing rod 205 is hinged to the outside of the slider 203. A protective plate 206 is hinged to the other end of the swing rod 205. A first spring 204 is sleeved on the outside of the slide rod 202.

[0022] Specifically, when the sleeve joint body 1 is hit by an external object, the object will first contact the outer surface of the protective plate 206. At this time, the protective plate 206 transmits the impact force to the swing rod 205. At this time, under the action of the traction force of the swing rod 205, the slider 203 and the first spring 204 are in a compressed state, and the impact energy of the external object is converted into elastic potential energy of the first spring 204 for energy consumption, thereby improving the service life of the sleeve joint body 1. The function of the slide bar 202 is to ensure that the slide bar 203 can move along the outer wall of the slide bar 202, thereby ensuring the stability of the slide bar 203 during the movement process. In addition, the first spring 204 is sleeved on the outside of the slide bar 202, so that the first spring 204 can undergo normal deformation during the compression process, thereby ensuring the service life of the first spring 204.

[0023] Please see attached Figure 1 and attached Figure 2 The longitudinal section of the protective plate 206 is set to be arc-shaped, and the upper and lower ends of the first spring 204 are fixedly connected to the outside of the slider 203 at the corresponding position.

[0024] Specifically, the protective plate 206 can increase the area of ​​collision with external objects through the arc design, so that the sleeve joint body 1 has a better protection effect, and can be better connected with the slider 203 through the first spring 204, which is more convenient for the use of the first spring 204.

[0025] Please see attached Figure 5 The locking assembly includes two fixing plates 401 and fixing grooves 403. The two fixing plates 401 are fixedly connected to the outside of the connecting plate 311. The fixing grooves 403 are provided on the outer surface of the pull rod 302. The fixing plates 401 are provided with thread grooves 404 inside. The fixing grooves 403 are provided with positioning pins 402 inside. The shape of the fixing grooves 403 matches the shape of the positioning pins 402. The outer surface of the fixing plates 401 is provided with external threads matching the thread grooves 404.

[0026] Specifically, by rotating the positioning pin 402, the positioning pin 402 moves along the inner wall of the threaded groove 404 until one end of the positioning pin 402 penetrates into the fixing groove 403 opened inside the pull rod 302, thereby completing the fixation of the pull rod 302 and preventing the pull rod 302 from shaking during use, thereby ensuring the stability of the connecting part 301 during installation.

[0027] Please see attached Figure 6 The longitudinal section of the card block 308 is set to be square, and the card block 308 and the card slot 307 are plug-in matched.

[0028] Specifically, under the elastic force of the second spring 305 , the clamping block 308 moves outward until the clamping block 308 is clamped into the clamping slot 307 , thereby completing the installation of the connecting portion 301 .

[0029] Please see attached Figure 4 and attached Figure 6 One end of the second spring 305 away from the movable plate 309 is fixedly connected to the inner wall of the slide groove 312, and the other end of the connecting rod 306 is rotatably connected to the outside of the movable plate 309.

[0030] Specifically,.

[0031] Please see attached Figure 4 and attached Figure 6 The shape of the connecting portion 301 matches the connecting groove 310 , and a rubber ring is provided on the outer surface of the connecting portion 301 .

[0032] Specifically, the connection portion 301 is a mounting flange, and the sleeve joint body 1 can be connected to other objects through the mounting flange. The rubber ring can ensure the sealing of the sleeve joint body 1 during the connection process.

[0033] Please see attached Figure 3 The longitudinal section of the slider 203 is set to be square, and the outer surface of the slider 203 is slidably connected to the inner wall of the mounting shell 201.

[0034] Specifically, the longitudinal section design of the slider 203 ensures that the slider 203 can move more stably along the inner wall of the mounting shell 201 .

[0035] A method for using an oil well casing head comprises the following steps: Step 1: When the connecting part 301 needs to be docked, first pull the pull rod 302 outward to make the pull rod 302 move along the inner wall of the connecting groove 303. At this time, under the traction force of the connecting rod 306, the movable plate 309 moves along the inner wall of the sliding groove 312, and the second spring 305 is compressed. At this time, the connecting part 301 is inserted into the connecting groove 310 at the top of the sleeve joint body 1, and the pull rod 302 is released. Under the elastic force of the second spring 305, the block 308 moves outward until the block 308 is stuck in the slot 307, and the installation of the connecting part 301 is completed; Step 2: After the installation is completed, the positioning pin 402 is rotated so that the positioning pin 402 moves along the inner wall of the threaded groove 404 until one end of the positioning pin 402 penetrates into the fixing groove 403 provided inside the pull rod 302, thereby fixing the pull rod 302 and ensuring the stability of the connecting part 301 during the installation process; Step three, when the sleeve joint body 1 is used and hit by an external object, the object will first contact the outer surface of the protective plate 206. At this time, the protective plate 206 transmits the impact force to the swing rod 205. At this time, under the action of the traction force of the swing rod 205, the slider 203 moves along the outer surface of the slide rod 202, so that the first spring 204 is in a compressed state, and the impact energy of the external object is converted into the elastic potential energy of the first spring 204 for energy consumption, thereby improving the service life of the sleeve joint body 1.

[0036] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oil well casing head, comprising a casing joint body (1), characterized in that: The top of the sleeve joint body (1) is provided with a connection groove (310), the interior of the connection groove (310) is slidably connected to a connection portion (301), the left and right sides of the connection portion (301) are provided with two clamping grooves (307), the exterior of the sleeve joint body (1) is fixedly connected to two connection plates (311), the interior of the connection plates (311) is provided with a mounting groove (304), the inner side wall of the mounting groove (304) is provided with a connection groove (303), the interior of the connection groove (303) is slidably connected to a pull rod ( 302), the outer surface of the pull rod (302) is rotatably connected to two connecting rods (306), the inner wall of the installation groove (304) is also provided with two sliding grooves (312), the interior of the sliding groove (312) is slidably connected to a movable plate (309), one side of the movable plate (309) is fixedly connected to a second spring (305), the other side of the movable plate (309) is fixedly connected to a clamping block (308), the outside of the pull rod (302) is installed with a locking assembly, and the outside of the sleeve joint body (1) is installed with a buffer assembly.

2. The oil well casing head according to claim 1, characterized in that: The buffer assembly comprises a plurality of mounting shells (201), the plurality of mounting shells (201) are fixedly connected to the outside of the sleeve joint body (1), a sliding rod (202) is fixedly connected to the inside of the mounting shell (201), the outside of the sliding rod (202) is slidably connected to two sliders (203), the outside of the slider (203) is hinged with a swing rod (205), the other end of the swing rod (205) is hinged with a protective plate (206), and the outside of the sliding rod (202) is sleeved with a first spring (204).

3. An oil well casing head according to claim 2, characterized in that: The longitudinal section of the protective plate (206) is arranged to be arc-shaped, and the upper and lower ends of the first spring (204) are respectively fixedly connected to the outside of the slider (203) at corresponding positions.

4. The oil well casing head according to claim 1, characterized in that: The locking assembly comprises two fixing plates (401) and fixing grooves (403), the two fixing plates (401) are fixedly connected to the outside of the connecting plate (311), the fixing grooves (403) are formed on the outer surface of the pull rod (302), a threaded groove (404) is formed inside the fixing plates (401), and a positioning pin (402) is provided inside the fixing grooves (403).

5. The oil well casing head according to claim 4, characterized in that: The shape of the fixing groove (403) matches the shape of the positioning pin (402), and the outer surface of the fixing plate (401) is provided with an external thread matching the thread groove (404).

6. The oil well casing head according to claim 1, characterized in that: The longitudinal section of the card block (308) is arranged to be square, and the card block (308) and the card slot (307) are plug-fitted.

7. The oil well casing head according to claim 2, characterized in that: One end of the second spring (305) away from the movable plate (309) is fixedly connected to the inner wall of the sliding groove (312), and the other end of the connecting rod (306) is rotatably connected to the outside of the movable plate (309).

8. The oil well casing head according to claim 2, characterized in that: The shape of the connecting portion (301) matches the connecting groove (310), and a rubber ring is provided on the outer surface of the connecting portion (301).

9. The oil well casing head according to claim 2, characterized in that: The longitudinal section of the sliding block (203) is arranged to be square, and the outer surface of the sliding block (203) is slidably connected to the inner wall of the mounting shell (201).

10. A method for using an oil well casing head, used for an oil well casing head as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: When the connecting part (301) needs to be docked, first pull the pull rod (302) outward to move the pull rod (302) along the inner wall of the connecting groove (303). At this time, under the traction force of the connecting rod (306), the movable plate (309) moves along the inner wall of the sliding groove (312), and the second spring (305) is compressed. At this time, the connecting part (301) is inserted into the connecting groove (310) at the top of the sleeve joint body (1), and the pull rod (302) is released. Under the elastic force of the second spring (305), the clamping block (308) moves outward until the clamping block (308) is clamped in the clamping groove (307), thereby completing the installation of the connecting part (301); Step 2: After the installation is completed, the positioning pin (402) is rotated so that the positioning pin (402) moves along the inner wall of the threaded groove (404) until one end of the positioning pin (402) penetrates into the fixing groove (403) provided inside the pull rod (302), thereby fixing the pull rod (302) and ensuring the stability of the connecting portion (301) during the installation process; Step 3. When the sleeve joint body (1) is used and is hit by an external object, the object first contacts the outer surface of the protective plate (206). At this time, the protective plate (206) transmits the impact force to the swing rod (205). At this time, under the action of the traction force of the swing rod (205), the slider (203) moves along the outer surface of the slide rod (202), so that the first spring (204) is in a compressed state, and the impact energy of the external object is converted into the elastic potential energy of the first spring (204) for energy consumption, thereby improving the service life of the sleeve joint body (1).

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