Wellhead shock absorption device and use method thereof

Abstract

The invention discloses a wellhead shock-absorbing device and a method of using the same, comprising a shock-absorbing lubricating preventer, a shock-absorbing part and a pressure cap; the shock-absorbing lubricating preventer is provided with the top end of the gas lift lubricating preventer, and the lower end of the shock-absorbing lubricating preventer is connected to the sealing hole of the gas lift lubricating preventer; the pressure cap is sleeved on the outer side of the lower end of the shock-absorbing lubricating preventer, the upper end of the pressure cap is connected to the outer side of the lower end of the shock-absorbing lubricating preventer, and can slide along the outer side of the shock-absorbing lubricating preventer; the lower end of the pressure cap is connected to the male buckle of the gas lift lubricating preventer; the shock-absorbing part is a tubular structure and is passed through the shock-absorbing lubricating preventer; the outer wall of the shock-absorbing part is tightly fixed to the inner wall of the shock-absorbing lubricating preventer; the inner wall of the shock-absorbing part is provided with a shock-absorbing structure; the invention effectively eliminates the impact of the throttle on the wellhead and eliminates noise by passing the shock-absorbing part through the shock-absorbing part in the shock-absorbing lubricating preventer and utilizing the shock-absorbing structure of the inner wall of the shock-absorbing part; at the same time, the shock-absorbing part is utilized to capture the gas lift salvage tool to reduce the operation process; the structure is simple and easy to use, and the safety of the gas lift salvage throttle is effectively improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of natural gas development, and relates to a wellhead shock absorbing device and a use method thereof, and in particular to a wellhead shock absorbing device for gas lift fishing of a downhole choke and a use method thereof. Background Art

[0002] In the later stage of gas well production, it is necessary to salvage the downhole choke for drainage operations. Currently, most downhole chokes are fished out using steel wire. During the steel wire fishing operation, if the steel wire tension cannot overcome the upward resistance of the choke and the fishing fails, the choke can be lifted with the help of the gas well energy. Currently, the conventional practice for gas lift choke fishing is to open the well and lift it after closing the gas tree test well gate or installing a blowout preventer. When the choke reaches the wellhead and moves upward at a fast speed, the impact force on the wellhead gate or blowout preventer is relatively large, which poses an unsafe factor. Summary of the Invention

[0003] In response to the technical problems existing in the prior art, the present invention provides a wellhead shock absorbing device and a method for using the same to solve the technical problem that in the existing process of using gas lift to salvage the choke, the choke reaches the wellhead at a fast upward speed, which easily causes a large impact on the wellhead gate or blowout preventer, posing an unsafe factor.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] The present invention provides a wellhead shock absorption device, comprising a shock-absorbing lubricating pipe, a shock-absorbing member and a pressure cap; the shock-absorbing lubricating pipe is arranged at the top of the gas lift lubricating pipe, and the lower end of the shock-absorbing lubricating pipe is connected to the sealing hole of the gas lift lubricating pipe;

[0006] The pressure cap is mounted on the outer side of the lower end of the shock-absorbing lubricant preventer, and the upper end of the pressure cap is connected to the outer side of the lower end of the shock-absorbing lubricant preventer and can slide along the outer side of the shock-absorbing lubricant preventer; the lower end of the pressure cap is connected to the male buckle of the gas lift lubricant preventer;

[0007] The shock absorber is a tubular structure and is inserted into the shock-absorbing lubricating preventer; the outer wall of the shock absorber is tightly fixed to the inner wall of the shock-absorbing lubricating preventer; and the inner wall of the shock absorber is provided with a shock-absorbing structure.

[0008] Furthermore, an annular protrusion is provided on the outer side of the lower end of the shock-absorbing lubricating pipe, and a retaining ring is provided above the annular protrusion; the retaining ring fixing sleeve is provided on the outer side of the shock-absorbing lubricating pipe, and a pressure cap activity area is formed between the annular protrusion and the retaining ring;

[0009] An annular protrusion is provided on the inner side of the upper end of the pressure cap, and the annular protrusion is located in the pressure cap movable area; the outer side of the annular protrusion is fixedly connected to the inner wall of the pressure cap, and the inner side of the annular protrusion is slidably connected to the outer wall of the shock-absorbing and anti-blowout pipe.

[0010] Furthermore, it also includes a spray preventer cap, which is set on the top end of the shock-absorbing spray preventer.

[0011] Furthermore, a first sealing ring and a first anti-extrusion ring are provided between the blowout preventer cap and the shock-absorbing blowout preventer.

[0012] Furthermore, the shock-absorbing component is made of non-metallic rubber material, and the shock-absorbing structure on the inner wall of the shock-absorbing component is a wave-shaped shock-absorbing structure.

[0013] Furthermore, the wave crest of the wave-shaped shock-absorbing structure matches the size of the fishing neck of the gas lift fishing tool.

[0014] Furthermore, the longitudinal section of the lower end portion of the shock-absorbing component is configured as a V-shaped structure.

[0015] Furthermore, the lower end of the shock-absorbing lubricant preventer is inserted into the sealing hole of the gas lift lubricant preventer, and a second anti-extrusion ring and a second sealing ring are provided between the shock-absorbing lubricant preventer and the sealing hole of the gas lift lubricant preventer.

[0016] Furthermore, it also includes a handle, which is symmetrically arranged on the outer side of the upper end of the pressure cap; wherein the handle is threadedly connected to the gas lift blowout preventer.

[0017] The present invention also provides a method for using the wellhead shock absorbing device, comprising the following steps:

[0018] Connect the lower end of the shock-absorbing lubricant preventer to the sealing hole of the gas lift lubricant preventer, and connect the lower end of the pressure cap to the male buckle of the gas lift lubricant preventer;

[0019] When the well is opened, the choke is lifted and passed through the air lift lubricator and then enters the shock-absorbing lubricator. The choke is cushioned by the shock-absorbing component.

[0020] After the choke is salvaged, separate the pressure cap from the male buckle of the gas lift lubricant preventer, and pull the shock-absorbing lubricant preventer out of the sealing hole of the gas lift lubricant preventer.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The present invention provides a wellhead shock-absorbing device and a method for using the device. A pressure cap is used to connect a shock-absorbing lubricating preventer with a gas lift lubricating preventer. A shock-absorbing component is inserted into the shock-absorbing lubricating preventer, and the shock-absorbing structure of the inner wall of the shock-absorbing component is utilized to effectively eliminate the impact of the choke on the wellhead and eliminate noise. At the same time, the shock-absorbing component is utilized to capture the gas lift salvage tool, thereby reducing the number of operating procedures. The device has a simple structure and is easy to use, effectively improving the safety of the gas lift salvage choke.

[0023] Furthermore, by forming a pressure cap active area between the annular protrusion and the retaining ring, the upper end of the pressure cap is slidably set in the pressure cap active area through the annular protrusion, thereby restricting the pressure cap to the lower end of the shock-absorbing blowout preventer, thereby protecting the sealing structure of the lower end of the shock-absorbing blowout preventer; at the same time, during the disassembly of the wellhead shock-absorbing device, the upper end of the pressure cap is abutted against the retaining ring, which facilitates the removal of the shock-absorbing blowout preventer from the sealing hole of the gas lift blowout preventer, thereby facilitating the disassembly of the device.

[0024] Furthermore, by providing a blowout preventer cap at the top of the shock-absorbing lubricating preventer, the gas lift salvage tool is effectively prevented from flying out of the top of the shock-absorbing lubricating preventer; at the same time, it is convenient to inspect and maintain the shock-absorbing parts in the shock-absorbing lubricating preventer.

[0025] Furthermore, a sealing ring is provided between the blowout preventer and the shock-absorbing blowout preventer to ensure that after the wellhead shock-absorbing device is installed, there is sufficient gas pressure in the well to ensure the success of the choke gas lift salvage; since the anti-extrusion ring is harder than the sealing ring, it can protect the sealing ring and improve the sealing ability.

[0026] Furthermore, the shock absorber is made of non-metallic rubber material, and the shock absorber structure is set to a wave-shaped shock absorber structure, which has good deformation buffering ability; the wave crest of the wave-shaped shock absorber structure can achieve step-by-step damping buffering when the salvage tool enters the inner cavity of the shock absorber, effectively improving the buffering effect.

[0027] Furthermore, the wave crest of the wave-shaped shock-absorbing structure matches the size of the fishing neck of the gas lift fishing tool, which can capture the gas lift fishing tool while absorbing the shock, preventing the fishing tool from falling back into the well after the well is shut in, saving wellhead catchers and reducing the fishing operation process.

[0028] Furthermore, the longitudinal section of the lower end of the shock absorber is set to a V-shaped structure, so that the shock absorber has an internal and external guiding function; wherein, the internal guide can guide the salvage neck of the gas lift salvage tool to smoothly enter the inner cavity of the shock absorber, and the external guide can ensure that the shock absorber rebounds smoothly after compression.

[0029] Furthermore, by arranging a second anti-extrusion ring and a second sealing ring between the sealing hole of the shock-absorbing blowout preventer and the gas lift blowout preventer, it is ensured that after the wellhead shock-absorbing device is installed, the gas in the well will not leak from the threaded connection between the pressure cap and the gas well blowout preventer, thereby ensuring the success of the throttle gas lift salvage; the anti-extrusion ring has a higher hardness than the sealing ring, which can protect the sealing ring and improve the sealing ability.

[0030] Furthermore, by symmetrically arranging handles on the outer side of the upper end of the pressure cap, the installation and removal of the pressure cap are facilitated. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the structure of the wellhead shock absorption device described in the embodiment.

[0032] Among them, 1 is the blowout preventer, 2 is the first sealing ring, 3 is the first anti-extrusion ring, 4 is the shock-absorbing blowout preventer, 5 is the shock-absorbing part, 6 is the retaining ring, 7 is the set screw, 8 is the handle, 9 is the second anti-extrusion ring, 10 is the second sealing ring, and 11 is the pressure cap. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention more clearly understood, the present invention is further described in detail in the following specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] The present invention provides a wellhead shock absorption device, comprising a blowout preventer 1, a first sealing ring 2, a first anti-extrusion ring 3, a shock-absorbing blowout preventer 4, a shock-absorbing member 5, a retaining ring 6, a handle 8, a second anti-extrusion ring 9, a second sealing ring 10 and a pressure cap 11.

[0035] The shock-absorbing lubricant preventer 4 is arranged at the top of the gas lift lubricant preventer, and the lower end of the shock-absorbing lubricant preventer 4 is sealed and connected to the sealing hole of the gas lift lubricant preventer; the blowout preventer cap 1 is arranged at the upper end of the shock-absorbing lubricant preventer 4, and the blowout preventer cap 1 and the shock-absorbing lubricant preventer 4 are connected by threads; by arranging the blowout preventer cap at the top of the shock-absorbing lubricant preventer, the gas lift salvage tool is effectively prevented from flying out from the top of the shock-absorbing lubricant preventer; at the same time, it is convenient to inspect and maintain the shock-absorbing parts in the shock-absorbing lubricant preventer; preferably, a first sealing ring 2 and a first anti-extrusion ring 3 are arranged between the blowout preventer cap 1 and the shock-absorbing lubricant preventer 4; a sealing ring is arranged between the blowout preventer cap and the shock-absorbing lubricant preventer, which ensures that after the wellhead shock-absorbing device is installed, there is sufficient gas pressure in the well to ensure the success of the throttle gas lift salvage; since the hardness of the anti-extrusion ring is higher than that of the sealing ring, it can protect the sealing ring and improve the sealing ability.

[0036] The pressure cap 11 is sleeved on the outer side of the lower end of the shock-absorbing lubricant preventer 4, and the upper end of the pressure cap 11 is connected to the outer side of the lower end of the shock-absorbing lubricant preventer 4, and can be slidably connected along the outer side of the shock-absorbing lubricant preventer 4; the lower end of the pressure cap 11 is connected to the male buckle of the gas lift lubricant preventer.

[0037] The shock absorber 5 is a tubular structure and is passed through the shock-absorbing lubricating preventer 4; the outer wall of the shock absorber 5 is tightly fixed to the inner wall of the shock-absorbing lubricating preventer 4; the inner wall of the shock absorber 5 is provided with a shock-absorbing structure; preferably, the shock absorber 5 is made of non-metallic rubber material, and the shock-absorbing structure on the inner wall of the shock absorber 5 is a wavy shock-absorbing structure; the shock absorber is made of non-metallic rubber material, and the shock-absorbing structure is set to a wavy shock-absorbing structure, which has good deformation buffering ability; the wave crest of the wavy shock-absorbing structure can achieve step-by-step damping buffering when the salvage tool enters the inner cavity of the shock absorber, effectively improving the buffering effect; wherein, the wavy The wave crest of the shock-absorbing structure matches the size of the salvage neck of the gas lift salvage tool; the wave crest of the wavy shock-absorbing structure matches the size of the salvage neck of the gas lift salvage tool, which can capture the gas lift salvage tool while reducing shock, avoiding the salvage tool from falling back into the well after the well is shut down, saving wellhead catchers, and reducing salvage operation procedures; the longitudinal section of the lower end of the shock-absorbing member 5 is set to a V-shaped structure, and the longitudinal section of the lower end of the shock-absorbing member is set to a V-shaped structure, so that the shock-absorbing member has an internal and external guiding function; among them, the internal guide can guide the salvage neck of the gas lift salvage tool to smoothly enter the inner cavity of the shock-absorbing member, and the external guide can ensure that the shock-absorbing member rebounds and resets smoothly after compression.

[0038] In the present invention, an annular protrusion is provided on the outer side of the lower end of the shock-absorbing lubricating pipe 4, and a retaining ring 6 is provided above the annular protrusion; the retaining ring 6 is fixed on the outer side of the shock-absorbing lubricating pipe 4, and a pressure cap activity area is formed between the annular protrusion and the retaining ring 6; wherein, when the retaining ring 6 and the shock-absorbing lubricating pipe 4 are fixedly connected by a set screw 7; an annular protrusion is provided on the inner side of the upper end of the pressure cap 11, and the annular protrusion is located in the pressure cap activity area; the outer side of the annular protrusion is fixedly connected to the inner wall of the pressure cap 11, and the annular protrusion is located in the pressure cap activity area. The inner side of the rising part is slidably connected to the outer wall of the shock-absorbing lubricant preventer 4; by forming a pressure cap active area between the annular protrusion and the retaining ring, the upper end of the pressure cap is slidably set in the pressure cap active area through the annular protrusion, so as to limit the pressure cap to the lower end of the shock-absorbing lubricant preventer, thereby forming protection for the sealing structure of the lower end of the shock-absorbing lubricant preventer; at the same time, during the disassembly of the wellhead shock-absorbing device, the upper end of the pressure cap is abutted against the retaining ring, which facilitates the removal of the shock-absorbing lubricant preventer from the sealing hole of the gas lift lubricant preventer, thereby facilitating the disassembly of the device.

[0039] In the present invention, the lower end of the shock-absorbing lubricant preventer 4 is inserted into the sealing hole of the gas lift lubricant preventer, and a second anti-extrusion ring 9 and a second sealing ring 10 are arranged between the shock-absorbing lubricant preventer 4 and the sealing hole of the gas lift lubricant preventer; the handle 8 is symmetrically arranged on the outer side of the upper end of the pressure cap 11, which is convenient for installing and disassembling the pressure cap and the gas lift lubricant preventer through threads.

[0040] The method for using the wellhead shock absorbing device of the present invention specifically comprises the following steps:

[0041] Connect the lower end of the shock-absorbing lubricant preventer 4 to the sealing hole of the gas lift lubricant preventer, and connect the lower end of the pressure cap 11 to the male buckle of the gas lift lubricant preventer;

[0042] The choke is lifted when the well is opened, so that the choke passes through the gas lift lubricator and then enters the shock-absorbing lubricator. The shock-absorbing member 5 is used to cushion the choke and the gas lift fishing tool is captured.

[0043] After the choke is salvaged, the pressure cap 11 is separated from the male buckle of the gas lift lubricant preventer, and the shock-absorbing lubricant preventer 4 is pulled out from the sealing hole of the gas lift lubricant preventer.

[0044] The wellhead shock absorption device and the use method thereof described in the present invention adopt a pressure cap to connect the shock-absorbing lubricating preventer with the gas lift lubricating preventer. By inserting a shock-absorbing part into the shock-absorbing lubricating preventer and utilizing the shock-absorbing structure of the inner wall of the shock-absorbing part, the impact of the choke on the wellhead is effectively eliminated, thereby eliminating noise. At the same time, the shock-absorbing part is utilized to capture the gas lift salvage tool, thereby reducing the operation process. The device has a simple structure and is easy to use, thereby effectively improving the safety of the gas lift salvage choke.

[0045] Example

[0046] As attached Figure 1 As shown, this embodiment provides a wellhead shock absorption device, including a blowout preventer 1, a first sealing ring 2, a first anti-extrusion ring 3, a shock-absorbing blowout preventer 4, a shock-absorbing member 5, a retaining ring 6, a handle 8, a second anti-extrusion ring 9, a second sealing ring 10 and a pressure cap 11.

[0047] The blowout preventer cap 1 is arranged at the upper end of the shock-absorbing lubricant preventer 4, and the blowout preventer cap 1 and the shock-absorbing lubricant preventer 4 are connected by threads; wherein, a first sealing groove is provided on the outer side of the upper end of the shock-absorbing lubricant preventer 4; the first sealing ring 2 and the first anti-extrusion ring 3 are arranged between the blowout preventer cap 1 and the shock-absorbing lubricant preventer 4, and are positioned in the first sealing groove.

[0048] The shock-absorbing lubricant preventer 4 is arranged at the top end of the gas lift lubricant preventer, and the lower end of the shock-absorbing lubricant preventer 4 is sealed and connected to the sealing hole of the gas lift lubricant preventer; wherein, the lower end of the shock-absorbing lubricant preventer 4 is inserted into the sealing hole of the gas lift lubricant preventer, and a second sealing groove is provided on the outer side of the lower end of the shock-absorbing lubricant preventer 4; the second anti-extrusion ring 9 and the second sealing ring 10 are both arranged between the shock-absorbing lubricant preventer 4 and the sealing hole of the gas lift lubricant preventer, and are both located in the second sealing groove.

[0049] The pressure cap 11 is sleeved on the outer side of the lower end of the shock-absorbing lubricating preventer 4, and the upper end of the pressure cap 11 is connected to the outer side of the lower end of the shock-absorbing lubricating preventer 4, and can be slidably connected along the outer side of the shock-absorbing lubricating preventer 4; the lower end of the pressure cap 11 is connected to the male buckle of the gas lift lubricating preventer by a thread; the outer side of the lower end of the shock-absorbing lubricating preventer 4 is provided with an annular protrusion, and a retaining ring 6 is provided above the annular protrusion; the retaining ring 6 is fixed to the outer side of the shock-absorbing lubricating preventer 4, and a pressure cap active area is formed between the annular protrusion and the retaining ring 6; wherein, the retaining ring 6 and the shock-absorbing lubricating preventer 4 are fixedly connected by a set screw 7; an annular protrusion is provided on the inner side of the upper end of the pressure cap 11, and the annular protrusion is located in the pressure cap active area; the outer side of the annular protrusion is fixedly connected to the inner wall of the pressure cap 11, and the inner side of the annular protrusion is slidably connected to the outer wall of the shock-absorbing lubricating preventer 4; the handle 8 is symmetrically arranged on the outer side of the upper end of the pressure cap 11.

[0050] In this embodiment, the shock absorber 5 is a tubular structure and is inserted into the shock-absorbing lubricating preventer 4; the outer wall of the shock absorber 5 is tightly fixed to the inner wall of the shock-absorbing lubricating preventer 4; the inner wall of the shock absorber 5 is provided with a shock-absorbing structure; the shock absorber 5 is made of non-metallic rubber material, and the shock-absorbing structure on the inner wall of the shock absorber 5 is a wave-shaped shock-absorbing structure; the wave crest of the wave-shaped shock-absorbing structure matches the size of the fishing neck of the gas lift fishing tool; the longitudinal section of the lower end of the shock absorber 5 is set to a V-shaped structure.

[0051] Directions:

[0052] When the wellhead shock-absorbing device described in this embodiment is used, the lower end of the shock-absorbing lubricant preventer 4 is connected to the sealing hole of the gas lift lubricant preventer, and the lower end of the pressure cap 11 is connected to the male buckle of the gas lift lubricant preventer; the throttle is lifted after opening the well, so that the throttle passes through the gas lift lubricant preventer and enters the shock-absorbing lubricant preventer, the shock-absorbing component 5 is used to buffer the throttle, and the gas lift salvage tool is captured; after the throttle is salvaged, the pressure cap 11 is separated from the male buckle of the gas lift lubricant preventer, and the shock-absorbing lubricant preventer 4 is pulled out from the sealing hole of the gas lift lubricant preventer.

[0053] The wellhead shock-absorbing device described in this embodiment connects the blowout preventer cap 1 to the shock-absorbing lubricating preventer pipe 4 through a threaded connection; the retaining ring 6 is used to limit the pressure cap 11 to the lower end of the shock-absorbing lubricating preventer pipe 4 to prevent the second sealing ring 10 and the sealing surface at the lower end of the shock-absorbing lubricating preventer pipe 4 from being damaged during transportation; at the same time, when the wellhead shock-absorbing device is removed from the gas lift lubricating preventer pipe, the pressure cap 11 is rotated to withdraw it from the male buckle of the gas lift lubricating preventer pipe. In the process, the upper end of the pressure cap 11 pushes the retaining ring 6 upward to pull out the second sealing ring 10 from the sealing hole of the gas lift lubricating preventer pipe, thereby facilitating disassembly; wherein, the second anti-extrusion ring 9 and the second sealing ring 10 are inserted into the sealing hole of the gas lift lubricating preventer pipe, and serve as a sealing connection part.

[0054] In this embodiment, the shock absorber 5 is installed in the shock-absorbing and anti-blowout pipe 4, which can eliminate the impact force of the throttle on the wellhead and has a good shock absorption effect; the shock absorber 5 is made of non-metallic rubber material, which can eliminate the impact force of the throttle on the wellhead and reduce noise; the longitudinal section of the lower end of the shock absorber 5 is set to a V-shaped structure, so that it has an internal and external guiding function; among them, the internal guide can guide the salvage neck of the gas lift salvage tool to smoothly enter the inner cavity of the shock absorber 5, and the external guide can ensure that the shock absorber 5 rebounds and resets smoothly after compression; the inner wall of the shock absorber 5 adopts a wavy design to form a wavy shock-absorbing structure, which has good deformation buffering capacity; at the same time, the wave crest of the wavy shock-absorbing structure can achieve step-by-step damping and buffering when the salvage tool enters the inner cavity, further improving the buffering effect; the wave crest of the wavy shock-absorbing structure in the shock absorber 5 cooperates with the salvage neck of the gas lift salvage tool to capture the gas lift salvage tool while reducing shock, avoiding the salvage tool from falling into the well again after the well is shut down, saving wellhead catchers, and reducing salvage operation procedures.

[0055] The wellhead shock absorbing device and the method of use thereof described in the present invention are used in the process of choke salvage in gas field underground operations. When in use, the wellhead shock absorbing device is installed on the top of the gas lift blowout preventer. The impact force of the choke on the wellhead is eliminated by the shock absorbing parts inside the wellhead shock absorbing device, and the noise is eliminated by the non-metallic shock absorbing parts, thereby achieving the purpose of saving wellhead catchers, reducing operating procedures and protecting the wellhead.

[0056] The above embodiment is only one of the implementation methods that can realize the technical solution of the present invention. The scope of protection claimed by the present invention is not limited only to this embodiment, but also includes changes, replacements and other implementation methods that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention.

Claims

1. A wellhead shock absorption device, characterized in that: It comprises a shock-absorbing lubricating preventer (4), a shock-absorbing member (5) and a pressure cap (11); the shock-absorbing lubricating preventer (4) is arranged at the top end of the gas lift lubricating preventer, and the lower end of the shock-absorbing lubricating preventer (4) is connected to the sealing hole of the gas lift lubricating preventer; The pressure cap (11) is sleeved on the outer side of the lower end of the shock-absorbing lubricating pipe (4), the upper end of the pressure cap (11) is connected to the outer side of the lower end of the shock-absorbing lubricating pipe (4), and can slide along the outer side of the shock-absorbing lubricating pipe (4); the lower end of the pressure cap (11) is connected to the male buckle of the gas lift lubricating pipe; The shock-absorbing member (5) is a tubular structure and is inserted into the shock-absorbing lubricating preventer (4); the outer wall of the shock-absorbing member (5) is tightly fixed to the inner wall of the shock-absorbing lubricating preventer (4); and the inner wall of the shock-absorbing member (5) is provided with a shock-absorbing structure. An annular protrusion is provided on the outer side of the lower end of the shock-absorbing and anti-loosening pipe (4), and a retaining ring (6) is provided above the annular protrusion; the retaining ring (6) is fixedly sleeved on the outer side of the shock-absorbing and anti-loosening pipe (4), and a pressure cap active area is formed between the annular protrusion and the retaining ring (6); An annular protrusion is provided on the inner side of the upper end of the pressure cap (11), and the annular protrusion is located in the pressure cap movable area; the outer side of the annular protrusion is fixedly connected to the inner wall of the pressure cap (11), and the inner side of the annular protrusion is slidably connected to the outer wall of the shock-absorbing and anti-blowout pipe (4); It also includes a spray-proof cap (1), which is sleeved on the top end of the shock-absorbing spray-proof pipe (4); A first sealing ring (2) and a first anti-extrusion ring (3) are provided between the anti-spray cap (1) and the shock-absorbing anti-spray pipe (4).

2. A wellhead shock absorption device according to claim 1, characterized in that: The shock absorbing member (5) is made of non-metallic rubber material, and the shock absorbing structure on the inner wall of the shock absorbing member (5) is a wave-shaped shock absorbing structure.

3. A wellhead shock absorption device according to claim 2, characterized in that: The wave crest of the wave-shaped shock-absorbing structure matches the size of the fishing neck of the gas lift fishing tool.

4. A wellhead shock absorption device according to claim 1, characterized in that: The longitudinal section of the lower end portion of the shock absorbing member (5) is arranged in a V-shaped structure.

5. The wellhead shock absorption device according to claim 1, characterized in that: The lower end of the shock-absorbing lubricant preventer (4) is inserted into the sealing hole of the gas lift lubricant preventer, and a second anti-extrusion ring (9) and a second sealing ring (10) are provided between the shock-absorbing lubricant preventer (4) and the sealing hole of the gas lift lubricant preventer.

6. The wellhead shock absorption device according to claim 1, characterized in that: It also includes a handle (8), which is symmetrically arranged on the outer side of the upper end of the pressure cap (11).

7. A method for using a wellhead shock absorbing device according to any one of claims 1 to 6, characterized in that: The following steps are involved: Connect the lower end of the shock-absorbing lubricant preventer (4) to the sealing hole of the gas lift lubricant preventer, and connect the lower end of the pressure cap (11) to the male buckle of the gas lift lubricant preventer; The choke is lifted when the well is opened, so that the choke passes through the air lift lubricant preventer and then enters the shock-absorbing lubricant preventer, and the choke is buffered by the shock-absorbing member (5); After the choke is salvaged, the pressure cap (11) is separated from the male buckle of the gas lift lubricant preventer, and the shock-absorbing lubricant preventer (4) is pulled out from the sealing hole of the gas lift lubricant preventer.

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