Emergency device matched with cement head for well cementation

Abstract

The utility model provides an emergency device matched with a cement head for well cementation, which relates to the technical field of oil field drilling, and comprises a barrel, a well cementation rubber plug and a stop pin assembly, the barrel is provided with a vertically through accommodating cavity, the well cementation rubber plug is arranged in the accommodating cavity, and the stop pin assembly is arranged on the side wall of the barrel and positioned below the well cementation rubber plug. The stop pin assembly can support and release the well cementation rubber plug. The emergency device matched with the cement head for well cementation has a well cementation rubber plug releasing function, and it is guaranteed that follow-up well cementation operation can be conducted smoothly.

Description

Technical Field

[0001] The utility model relates to the technical field of oil field drilling, in particular to an emergency device matched with a cement head for cementing. Background Art

[0002] In the field of oilfield drilling, cementing heads are essential wellhead tools for cementing construction. Cementing heads are installed at the wellhead to connect cementing manifolds and casings; and cementing heads also have the functions of releasing cementing plugs, indicating cementing plugs, and ensuring smooth cement slurry replacement. During on-site construction, cement heads work in relatively harsh working environments and need to withstand high construction liquid pressures. Even cementing heads with special functions need to withstand tensile and torsional mechanical forces. Therefore, cement heads often experience on-site emergencies such as liquid leakage and parts damage. For the above emergencies, emergency devices are required on-site for emergency operations to replace cementing heads and carry out subsequent cementing construction operations.

[0003] The existing emergency device includes an accident joint and a circulation joint. However, the above-mentioned existing emergency device has many technical drawbacks during use.

[0004] When using accident joints for emergency operations, since accident joints often use a drill pipe female buckle and a casing male buckle as the connection method, it is necessary to remove the cement head and then reconnect, which leads to long operation time and high engineering risk. In addition, there is also the risk of thread damage and inability to connect or seal failure when the casing thread is removed and then the accident joint is reconnected.

[0005] When using circulating joints for emergency operations, if low-pressure circulating joints are used, there will be safety risks for deep wells or wells with high construction pressure; if high-pressure circulating joints are used, if puncture or other emergencies occur during water injection, cementing plug operations cannot be performed after connecting the circulating joints, and only quantitative displacement methods can be adopted, which often causes plugging accidents.

[0006] In view of this, the inventor, based on many years of experience in production design in this field and related fields, has designed an emergency device for a cement head for cementing after repeated experiments, in order to solve the problems existing in the prior art. Utility Model Content

[0007] The utility model aims to provide an emergency device matched with a cement head for cementing, which has a cementing plug releasing function and ensures that subsequent cementing operations can be carried out smoothly.

[0008] In order to achieve the above-mentioned purpose, the utility model proposes an emergency device for a cement head for cementing, wherein the emergency device includes a cylinder, a cementing plug and a stop pin assembly, the cylinder has a accommodating cavity that passes through from top to bottom, the cementing plug is arranged in the accommodating cavity, the stop pin assembly is arranged on the side wall of the cylinder and is located below the cementing plug, and the stop pin assembly can support and release the cementing plug.

[0009] As described above, the emergency device matched with the cement head for cementing, wherein the top end of the cylinder is provided with a union interface for connecting with the cementing pipeline.

[0010] In the emergency device matched with the cement head for cementing as described above, the bottom end of the cylinder is provided with a connecting portion which can be connected with the lower joint of the cement head for cementing.

[0011] In the emergency device matched with the cement head for cementing as described above, the inner diameter of the connecting part is larger than the diameter of the accommodating cavity and is formed with a first limiting step, and the lower joint can be inserted into the connecting part and abut against the first limiting step.

[0012] As described above, the emergency device matched with the cement head for cementing, wherein the lower joint is further provided with a connecting sleeve, and the outer wall of the connecting part is provided with an external thread corresponding to the connecting sleeve.

[0013] In the emergency device matched with the cement head for cementing as described above, at least one sealing ring is further provided between the connecting portion and the lower joint.

[0014] The emergency device for the cement head for cementing as described above, wherein the stop pin assembly comprises:

[0015] A stop pin seat, fixedly connected to the outer wall of the cylinder, the stop pin seat having a mounting cavity opened along the radial direction of the cylinder, the mounting cavity passing through the stop pin seat;

[0016] A stop pin rod is slidably disposed in the installation cavity, and one end of the stop pin rod can penetrate the side wall of the cylinder and extend into the accommodating cavity;

[0017] The driving mechanism is connected with the stop pin rod and drives the stop pin rod to extend into the accommodating cavity and retract into the installation cavity.

[0018] The emergency device for the cement head for cementing as described above, wherein the driving mechanism comprises:

[0019] An end cover is arranged at one end of the stop pin seat facing away from the cylinder and closes the installation cavity;

[0020] A driving screw rod is inserted into the installation cavity, one end of the driving screw rod passes through the end cover and is sealed and rotatably matched with the end cover, and the other end of the driving screw rod is provided with an external thread;

[0021] A threaded hole which matches with the external thread of the driving screw rod is provided on the end surface of the other end of the stop pin rod, and a limiting piece which only allows the stop pin rod to move axially is provided on the inner wall of the stop pin seat.

[0022] In the emergency device matched with the cement head for cementing as described above, a hand wheel is installed at one end of the driving screw.

[0023] The emergency device matched with the cement head for cementing as described above, wherein the emergency device also includes a cementing plug protection tube, the cementing plug protection tube is sleeved outside the cementing plug, and there is a gap between the outer wall of the cementing plug protection tube and the inner wall of the cylinder.

[0024] Compared with the prior art, the utility model has the following characteristics and advantages:

[0025] The utility model provides an emergency device for a cementing head for cementing, which is used in an emergency when the cementing head is damaged. The lower part of the cylinder of the emergency device can be installed on the lower joint of the cementing head, and the upper part of the cylinder can be connected to the cementing pipeline. A cementing plug is preset inside the cylinder and can be released through a stop pin assembly, so that subsequent cementing operations can continue.

[0026] The utility model provides an emergency device for a cementing head for cementing, which is used for emergency use after the cement head is damaged. The device has a cementing plug releasing function, ensures the subsequent displacement and collision, avoids plugging accidents, and effectively reduces the risk of cementing construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the components in the drawings are only for illustration purposes to help understand the present invention, and are not intended to specifically limit the shapes and proportional dimensions of the components of the present invention. Under the guidance of the present invention, those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to specific circumstances.

[0028] Figure 1 A schematic diagram of the structure of an emergency device provided by the utility model for a cementing head for cementing;

[0029] Figure 2 It is a partial enlarged view of the gear pin assembly in the utility model.

[0030] Description of Reference Numerals

[0031] 100. Emergency device; 10. Cylinder;

[0032] 11. Accommodating cavity; 12. Union port;

[0033] 13. First limiting step; 20. Cementing plug;

[0034] 30. Gear pin assembly; 31. Gear pin seat;

[0035] 32. Stop pin rod; 33. End cover;

[0036] 34. Driving screw rod; 35. Axial limiter;

[0037] 36. Hand wheel; 40. Sealing ring;

[0038] 50. Cementing rubber plug protection tube; 200. Lower joint;

[0039] 300. Connecting sleeve. DETAILED DESCRIPTION

[0040] The details of the present invention can be more clearly understood by combining the accompanying drawings with the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be considered to belong to the scope of the present invention.

[0041] like Figure 1 , Figure 2 As shown, the utility model proposes an emergency device 100 for a cementing head for cementing, the emergency device 100 includes a cylinder 10, a cementing plug 20 and a stop pin assembly 30, the cylinder 10 has an accommodating chamber 11 which passes through from top to bottom, the cementing plug 20 is arranged in the accommodating chamber 11, the stop pin assembly 30 is arranged on the side wall of the cylinder 10 and is located below the cementing plug 20, and the stop pin assembly 30 can support and release the cementing plug 20.

[0042] The utility model provides an emergency device 100 for a cementing head for cementing, which is used for emergency use when liquid leakage or damage occurs in the cementing head. The lower part of the cylinder 10 can be installed on the lower joint 200 of the cementing head, and the upper part of the cylinder 10 can be connected to the cementing pipeline. The cylinder 10 is provided with a cementing plug 20 inside and can release the cementing plug through the stop pin assembly 30, so as to continue the subsequent cementing construction operation.

[0043] The emergency device 100 provided by the utility model and matched with the cement head for cementing is used for emergency use after the cement head is damaged, and has the function of releasing the cementing plug, so as to ensure the subsequent displacement and collision, avoid the plugging accident, and effectively reduce the risk of cementing construction.

[0044] In an optional embodiment of the present invention, a union interface 12 for connecting to a cementing pipeline is provided at the top of the cylinder 10. Through the union interface 12, the cylinder 10 can be quickly connected to the cementing pipeline, reducing the time required for on-site emergency operations.

[0045] In an optional embodiment of the utility model, a connection part that can be connected to the lower joint 200 of the cementing head is provided at the bottom end of the cylinder 10. The emergency device 100 is quickly connected to the lower joint 200 of the cementing head through the connection part, further saving the time required for on-site emergency operations.

[0046] In an optional example of this embodiment, the inner diameter of the connecting portion is larger than the diameter of the accommodating cavity and is formed with a first limiting step 13, and the lower joint 200 can be inserted into the connecting portion and abut against the first limiting step 13. With the above structure, during emergency operation, the barrel 10 and the lower joint 200 are plug-fitted, and the barrel 10 can be quickly installed on the lower joint 200 of the cementing head, saving installation time.

[0047] In an optional example, the lower joint 200 is further provided with a connecting sleeve 300, and the outer wall of the connecting portion is provided with an external thread corresponding to the connecting sleeve 300. With the above structure, the original components of the cementing head can be fully utilized, and the lower joint 200 of the cementing head and the corresponding connecting sleeve 300 do not need to be removed. The connecting sleeve 300 and the barrel 10 can be directly used to thread the barrel 10 to quickly fix the barrel 10 on the lower joint 200.

[0048] In an optional example, at least one sealing ring 40 is further provided between the connecting portion and the lower joint 200 to ensure a sealed connection between the cylinder 10 and the lower joint 200, so that the emergency device 100 has high-pressure sealing capability.

[0049] Preferably, the sealing ring 40 is a high-pressure resistant sealing ring to ensure that the high-pressure sealing capability of the emergency device 100 is ≥84 MPa.

[0050] Preferably, two sealing rings 40 are provided between the cylinder 10 and the lower joint 200 .

[0051] In an optional embodiment of the present invention, the stop pin assembly 30 includes a stop pin seat 31, a stop pin rod 32 and a driving mechanism. The stop pin seat 31 is fixedly connected to the outer wall of the cylinder 10, and the stop pin seat 31 has an installation cavity opened along the radial direction of the cylinder 10, and the installation cavity passes through the stop pin seat 31; the stop pin rod 32 is slidably arranged in the installation cavity, and one end of the stop pin rod 32 can pass through the side wall of the cylinder 10 and extend into the accommodating cavity 11; the driving mechanism is connected to the stop pin rod 32 and drives the stop pin rod 32 to extend into the accommodating cavity 11 and retract into the installation cavity. With the above structure, the stop pin rod 32 extending into the accommodating chamber 11 supports the cementing plug 20, prevents the cementing plug 20 from falling, and realizes the pre-setting of the cementing plug 20; when the cementing plug 20 needs to be released, the stop pin rod 32 is radially moved outward, and the cementing plug 20 falls after losing the support of the stop pin rod 32, thereby realizing the release of the cementing plug 20.

[0052] In an optional example of this embodiment, the driving mechanism includes an end cover 33, a driving screw 34 and an axial stopper 35. The end cover 33 is provided on the end of the stopper pin seat 31 facing away from the cylinder 10 and closes the installation cavity. The driving screw 34 is inserted into the installation cavity. One end of the driving screw 34 passes through the end cover 33 and is sealed and rotated with the end cover 33. The other end of the driving screw 34 is provided with an external thread. The other end of the stopper pin rod 32 is provided with a threaded hole that is aligned with the external thread of the driving screw 34. The inner wall of the stopper pin seat 31 is provided with an axial stopper 35 that only allows the stopper pin rod 32 to move axially. Through the threaded cooperation between the driving screw 34 and the stopper pin rod 32, when the driving screw 34 is rotated, the stopper pin rod 32 moves along the axial direction of the installation cavity to achieve the extension and retraction of the stopper pin rod 32.

[0053] In an optional example, a hand wheel 36 is installed at one end of the driving screw rod 34 to facilitate an operator to rotate the driving screw rod 34 .

[0054] In an optional example, a seal is also provided between the stop pin seat 31 and the cylinder body 10 to ensure the overall high-pressure sealing capability of the emergency device 100 .

[0055] In an optional embodiment of the utility model, the emergency device 100 also includes a cementing plug protection tube 50, which is sleeved outside the cementing plug 20, and there is a gap between the outer wall of the cementing plug protection tube 50 and the inner wall of the cylinder 10 to ensure that the cementing plug 20 can be released smoothly.

[0056] Please refer to Figure 1 , Figure 2 Now, the specific installation and operation steps of the emergency device 100 for the cementing head for cementing proposed by the utility model are described in detail in conjunction with an embodiment.

[0057] First, press the cementing plug 20 from the top of the cementing plug protection tube 50 until it is flush with the bottom of the cementing plug protection tube 50;

[0058] Afterwards, lay the cylinder 10 flat, operate the stop pin assembly 30 until the stop pin rod 32 is retracted, insert the cementing plug 20 and cementing plug protection cylinder 50 installed as one, and insert the bottom of the cylinder 10 into the accommodating cavity 11, and make the bottom of the cementing plug protection cylinder 50 exceed the position of the stop pin assembly 30;

[0059] Then, the stop pin assembly 30 is operated until the stop pin rod 32 is fully extended to prevent the cementing plug 20 from falling;

[0060] Finally, during emergency operation, the installed emergency device 100 is hoisted, the cylinder 10 is placed vertically in the matching position of the lower joint 200, and then the connecting sleeve 300 is threadedly connected to the cylinder 10.

[0061] The emergency device 100 provided by the utility model for cementing cement head can be quickly installed on the lower joint 200 of the cementing cement head, saving time and reducing the risk of cementing engineering; moreover, the emergency device 100 provided by the cementing cement head has the function of releasing the cementing plug, which can ensure the later displacement and collision pressure.

[0062] The detailed explanation of the above-mentioned embodiments is only intended to explain the present invention so as to facilitate a better understanding of the present invention. However, these descriptions cannot be interpreted as limitations on the present invention for any reason. In particular, the various features described in different embodiments may also be arbitrarily combined with each other to form other embodiments. Unless there is a clear description to the contrary, these features should be understood to be applicable to any embodiment and are not limited to the described embodiments.

Claims

1. An emergency device for a cementing head, characterized in that: The emergency device includes a cylinder, a cementing plug and a stop pin assembly. The cylinder has a accommodating cavity that passes through from top to bottom. The cementing plug is arranged in the accommodating cavity. The stop pin assembly is arranged on the side wall of the cylinder and is located below the cementing plug. The stop pin assembly can support and release the cementing plug.

2. The emergency device for cementing head as claimed in claim 1, characterized in that: The top of the cylinder is provided with a union interface for connecting with a cementing pipeline.

3. The emergency device for cementing head as claimed in claim 1, characterized in that: The bottom end of the cylinder is provided with a connecting portion which can be connected with the lower joint of the cementing head.

4. The emergency device for cementing head as claimed in claim 3, characterized in that: The inner diameter of the connecting portion is larger than the diameter of the accommodating cavity and is formed with a first limiting step. The lower joint can be inserted into the connecting portion and abut against the first limiting step.

5. The emergency device for cementing head as claimed in claim 4, characterized in that: The lower joint is also sleeved with a connecting sleeve, and the outer wall of the connecting portion is provided with an external thread corresponding to the connecting sleeve.

6. The emergency device for cementing head as claimed in claim 4, characterized in that: At least one sealing ring is also arranged between the connecting portion and the lower joint.

7. The emergency device for cementing head as claimed in claim 1, characterized in that: The gear pin assembly comprises: A stop pin seat, fixedly connected to the outer wall of the cylinder, the stop pin seat having a mounting cavity opened along the radial direction of the cylinder, the mounting cavity passing through the stop pin seat; A stop pin rod is slidably disposed in the installation cavity, and one end of the stop pin rod can penetrate the side wall of the cylinder and extend into the accommodating cavity; The driving mechanism is connected with the stop pin rod and drives the stop pin rod to extend into the accommodating cavity and retract into the installation cavity.

8. The emergency device for cementing head as claimed in claim 7, characterized in that: The driving mechanism comprises: An end cover is arranged at one end of the stop pin seat facing away from the cylinder and closes the installation cavity; A driving screw rod is inserted into the installation cavity, one end of the driving screw rod passes through the end cover and is sealed and rotatably matched with the end cover, and the other end of the driving screw rod is provided with an external thread; A threaded hole which matches with the external thread of the driving screw rod is provided on the end surface of the other end of the stop pin rod, and a limiting piece which only allows the stop pin rod to move axially is provided on the inner wall of the stop pin seat.

9. The emergency device for cementing head as claimed in claim 8, characterized in that: A hand wheel is installed at one end of the driving screw rod.

10. The emergency device for cementing head as claimed in claim 1, characterized in that: The emergency device also includes a cementing rubber plug protection tube, which is sleeved outside the cementing rubber plug, and a gap is formed between the outer wall of the cementing rubber plug protection tube and the inner wall of the cylinder.

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