Well sealing head device for oil well

Abstract

The utility model relates to the technical field of well head sealing, and provides an oil well well head sealing device which comprises a flange body and a clamping cover plate assembly arranged above the flange body, a through hole is formed in the well head of an oil well, the center of the flange body is axially provided with a sealing core, the sealing core is made of flexible materials, and the center of the sealing core is axially provided with a through hole used for sealing the outer diameter of an oil pipe. The clamp is used for clamping the sealing core and the oil pipe outer diameter; the clamping cover plate assembly comprises a left cover plate and a right cover plate, a left connecting lug is arranged at one end of the left cover plate, a through hole is formed in the left connecting lug, a right connecting lug is arranged at one end of the right cover plate, a through hole is formed in the right connecting lug, the through hole of the left connecting lug coincides with the through hole of the right connecting lug, and a mandrel is arranged in the through hole of the left connecting lug and the through hole of the right connecting lug. The left connecting lug and the right connecting lug can rotate around the mandrel, the axis of the mandrel is parallel to the axis of the through hole of the flange body, and the mandrel is used for connecting the clamping cover plate assembly and the flange body. The external diameter of the oil pipe can be sealed when the oil pipe ascends, descends or rotates in a wellhead, and the sealing performance between the oil pipe and the wellhead is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of wellhead sealing, in particular to an oil well wellhead sealing device. Background Art

[0002] With the continuous development of my country's petroleum industry, the expansion of oil field operating areas, the gradual increase in the number of oil wells, and the continuous improvement and perfection of oil production technology.

[0003] Oil pipes or casings are often used in oil production. When the oil pipes or casings rise, fall or rotate from the wellhead of the oil well, a buffer area is required between the outer wall of the oil pipes or casings and the inner wall of the wellhead of the oil well to prevent the oil pipes or casings from colliding with the inner wall of the wellhead or debris from falling into the oil well through the gap between the outer wall of the oil pipes or casings and the inner wall of the wellhead of the oil well, causing adverse consequences. However, the traditional wellhead capping head has a complex structure and poor use effect.

[0004] Therefore, in view of the above problems, an oil well sealing head device is proposed to solve the above problems. Utility Model Content

[0005] The utility model aims at the deficiencies of the prior art and develops an oil well sealing wellhead device, which can seal the outer diameter of the oil pipe when it rises, descends or rotates in the wellhead, improve the sealing performance between the oil pipe and the wellhead, and can be used for empty well, reverse circulation operation, traditional drilling operation and circulation top cover.

[0006] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical solutions:

[0007] An oil well sealing head device, comprising:

[0008] The flange body is arranged at the wellhead of the oil well. An axial through hole is opened in the center of the flange body. A sealing core is arranged in the hole. The sealing core is arranged with a flexible material. An axial through hole is opened in the center of the sealing core for sealing the outer diameter of the oil pipe. A clamping cover plate assembly is arranged above the flange body for clamping the sealing core and the outer diameter of the oil pipe.

[0009] Preferably, the clamping cover plate assembly includes a left cover plate and a right cover plate, a left connecting ear is provided at one end of the left cover plate, and a through hole is provided on the left connecting ear, a right connecting ear is provided at one end of the right cover plate, and a through hole is provided on the right connecting ear, the through holes of the left connecting ear and the right connecting ear are arranged to overlap, and a core shaft is provided in the through holes of the left connecting ear and the right connecting ear, the left connecting ear and the right connecting ear can rotate around the core shaft, the axis of the core shaft is parallel to the axis of the through hole of the flange body, and the core shaft is used to connect the clamping cover plate assembly and the flange body, thereby improving the stability of the device.

[0010] Preferably, the clamping cover assembly also includes a connecting shaft, one end of which is movably arranged at the end of the right cover away from the right connecting ear, and a locking nut is arranged on the other end of the connecting shaft. The locking nut is threadedly connected to the connecting shaft and can move along the length direction of the connecting shaft. A clamping plate is arranged at the end of the left cover away from the left connecting ear, and a slot is provided on the clamping plate. The slot is used to accommodate the connecting shaft, thereby improving the practicability of the device.

[0011] Preferably, a flat washer is sleeved on the connecting shaft, and the flat washer is located on the inner side of the locking nut close to the center of the connecting shaft. The diameter of the flat washer is larger than the width of the slot, thereby improving the safety of the device.

[0012] Preferably, a sealing ring is provided at the bottom of the flange body, and a connecting hole is provided on the sealing ring for connecting to the oil well head. Support plates are symmetrically provided on both sides of the flange body, and the support plates are located below the clamping cover plate assembly and the two are in contact with each other, so as to support the clamping cover plate assembly. A connecting ear plate is provided on the outer wall of the flange body, and the connecting ear plate is connected to the clamping cover plate assembly through a core shaft. A vent is provided through the side wall of the flange body, and a dust plug is provided at the outer opening of the vent, thereby improving the practicability of the device.

[0013] Preferably, a connecting head is provided at one end of the connecting shaft away from the locking nut, a through hole is provided on the connecting head, a bolt is provided in the through hole and the right connecting ear is movably connected through the bolt, thereby improving the efficiency of the device.

[0014] Preferably, an oil cup is provided in the center of the core shaft, the oil cup and the core shaft are arranged coaxially, a plurality of oil outlet holes are provided on the side wall of the core shaft along the axis, the oil outlet holes are connected to the oil cup, and are used for oil outlet to lubricate the through holes of the left connecting ear and the right connecting ear, thereby improving the service life of the device.

[0015] Preferably, the longitudinal section of the sealing core is a funnel shape that is wide at the top and narrow at the bottom, and a card table is provided on the inclined surface of the funnel to support the sealing core and prevent the sealing core from falling. The upper side of the through hole of the flange body matches the shape and size of the upper side of the sealing core, and the inner sides of the left cover plate and the right cover plate match the flange body and the top of the sealing core to provide stepped holes, which improves the practicability of the device.

[0016] The effects provided in the utility model content are only the effects of the embodiments, not all the effects of the utility model. The above technical solution has the following advantages:

[0017] 1. The utility model provides a flange body, and a sealing ring is provided at the bottom of the flange body. A connecting hole is provided on the sealing ring, and the flange of the oil wellhead is connected by bolts. The connection is tighter and the sealing is better, thereby improving the practicality of the device;

[0018] 2. The utility model provides a sealing core at the center of the flange body, and the sealing core is made of flexible material, so as to seal the outer diameter of the oil pipe when the oil pipe rises, descends or rotates from the wellhead of the oil well, thereby improving the quality of construction;

[0019] 3. The utility model provides a clamping cover plate assembly, wherein the left cover plate and the right cover plate of the clamping cover plate assembly clamp the sealing core and fix them by a connecting shaft and a locking nut, so that the seal between the sealing core and the oil pipe is tighter and more stable, thereby improving the safety of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention.

[0021] Figure 1 This is a schematic diagram of the overall main structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the overall top view of the structure of an embodiment of the utility model;

[0023] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure in the middle A direction;

[0024] Figure 4 for Figure 2 Schematic diagram of the cross-sectional structure in the B direction;

[0025] Figure 5 A half-section front structural schematic diagram of a flange body according to an embodiment of the utility model;

[0026] Figure 6 It is a schematic diagram of a partial top view of the flange body of an embodiment of the utility model;

[0027] Figure 7 for Figure 6 Schematic diagram of the cross-sectional structure in the D direction;

[0028] Figure 8 for Figure 6 Schematic diagram of the cross-sectional structure in the C direction;

[0029] Fig. 9 It is a schematic diagram of the structure of the left cover plate in a top view and a right view according to an embodiment of the utility model;

[0030] Fig.10 It is a schematic diagram of the top view and left view of the right cover plate of an embodiment of the utility model;

[0031] Fig.11 This is a schematic diagram of the connection between the coupling shaft and the locking nut of an embodiment of the utility model;

[0032] Fig.12 It is a schematic diagram of the front view and side cross-sectional structure of the mandrel of an embodiment of the utility model;

[0033] Fig.13 It is a schematic cross-sectional structure diagram of the sealing core according to an embodiment of the utility model.

[0034] In the figure, 1. flange body; 2. sealing core; 3. clamping cover assembly; 4. core shaft; 5. warning sign; 11. connecting hole; 12. support plate; 13. connecting ear plate; 14. vent hole; 15. dust plug; 31. left cover plate; 32. right cover plate; 33. connecting shaft; 34. locking nut; 41. oil cup; 42. oil outlet hole; 311. left connecting ear; 312. clamping plate; 313. slot; 321. right connecting ear; 331. flat washer; 332. connecting head. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 1-13 As shown, the utility model provides a technical solution:

[0037] An oil well sealing head device is used to seal the outer diameter of an oil pipe when it rises, descends or rotates from a wellhead, comprising:

[0038] A flange body 1 is arranged at the wellhead of an oil well. A through hole is axially opened in the center of the flange body 1. A sealing core 2 is arranged in the through hole. The sealing core 2 is made of a flexible material, preferably a rubber material. A through hole is axially opened in the center of the sealing core 2 for being sleeved on the outside of an oil pipe to seal the outer diameter of the oil pipe. A clamping cover plate assembly 3 is arranged above the flange body 1 for clamping the sealing core 2 to make the contact between the sealing core 2 and the outer diameter of the oil pipe closer.

[0039] In this embodiment, the clamping cover plate assembly 3 includes a left cover plate 31 and a right cover plate 32. A left connecting ear 311 is provided at one end of the left cover plate 31, and a vertical through hole is opened on the left connecting ear 311. A right connecting ear 321 is provided at one end of the right cover plate 32. Preferably, two right connecting ears 321 are provided. A vertical through hole with overlapping axes is opened on the right connecting ear 321. The through holes of the left connecting ear 311 and the right connecting ear 321 are overlapped, and a core shaft 4 is provided in the through holes of the left connecting ear 311 and the right connecting ear 321. The left connecting ear 311 and the right connecting ear 321 can rotate around the core shaft 4. The axis of the core shaft 4 is parallel to the axis of the through hole of the flange body 1. The core shaft 4 is used to connect the clamping cover plate assembly 3 and the flange body 1, thereby improving the practicability of the device.

[0040] In this embodiment, the clamping cover assembly 3 also includes a connecting shaft 33, one end of which is movably arranged at an end of the right cover 32 away from the right connecting ear 321, and a locking nut 34 is arranged on the other end of the connecting shaft 33. The locking nut 34 is threadedly connected to the connecting shaft 33 and can move along the length direction of the connecting shaft 33. A clamping plate 312 is arranged at one end of the left cover 31 away from the left connecting ear 311, and a slot 313 is provided on the clamping plate 312. The slot 313 is used to accommodate the connecting shaft 33, thereby improving the safety of the device clamping.

[0041] In this embodiment, a flat washer 331 is sleeved on the connecting shaft 33, and the flat washer 331 is located on the inner side of the locking nut 34 close to the center of the connecting shaft 33. The diameter of the flat washer 331 is larger than the width of the slot 313 to increase the contact area between the locking nut 34 and the clamping plate 312, thereby improving the clamping stability.

[0042] In this embodiment, a sealing ring is arranged at the bottom of the flange body 1, and a connecting hole 11 is provided on the sealing ring for tightly connecting to the wellhead of the oil well. Support plates 12 are symmetrically arranged on both sides of the flange body 1, and the support plates 12 are located below the clamping cover plate assembly 3 and the two are in contact with each other. The support plates 12 are used to support the clamping cover plate assembly 3 and stabilize the left cover plate 31 and the right cover plate 32 when the left cover plate 31 and the right cover plate 32 rotate; a connecting ear plate 13 is arranged on the outer wall of the flange body 1, and the connecting ear plate 13 is connected to the clamping cover plate assembly 3 through the core shaft 4. A vent hole 14 is arranged through the side wall of the flange body 1, and a dust plug 15 is arranged at the outer mouth of the vent hole 14. The vent hole 14 is used for ventilation when the oil pipe rises or falls in the oil well, so as to avoid the formation of negative pressure or excessive pressure in the oil well when the oil pipe rises or falls, which hinders the oil pipe from rising or falling. The dust plug 15 is used to prevent dust from entering the oil well. The dust plug 15 and the vent hole 14 are threadedly connected, and its connectivity and sealing are better, thereby improving the practicality of the device.

[0043] In another embodiment, a through hole perpendicular to the axis of the core shaft 4 is opened at the bottom of the core shaft 4, and a pin is inserted into the through hole to prevent the core shaft 4 from falling off, thereby improving the safety of the device when in use.

[0044] In this embodiment, a connecting head 332 is provided at one end of the connecting shaft 33 away from the locking nut 34, and a through hole is provided on the connecting head 332. A bolt is provided in the through hole and the right connecting ear 321 is movably connected through the bolt to facilitate the clamping of the cover assembly 3 during clamping, so that the connection is more convenient and quick, thereby improving the efficiency of the device when in use.

[0045] In this embodiment, an oil cup 41 is provided at the center of the core shaft 4, and the oil cup 41 is coaxially arranged with the core shaft 4. A plurality of oil outlet holes 42 are provided on the side wall of the core shaft 4 along the axis. The oil outlet holes 42 are connected with the oil cup 41, and are used for oil outlet to lubricate the through holes of the left connecting ear 311 and the right connecting ear 321, so as to facilitate smoother rotation of the left cover plate 31 and the right cover plate 32 around the core shaft 4, thereby improving the practicability of the device.

[0046] In this embodiment, the longitudinal section of the sealing core 2 is a funnel shape that is wide at the top and narrow at the bottom, and a card platform is provided on the inclined surface of the funnel to support the sealing core 2 and prevent the sealing core 2 from falling. The upper side of the through hole of the flange body 1 matches the shape and size of the upper side of the sealing core 2. The inner sides of the left cover plate 31 and the right cover plate 32 match the flange body 1 and the top of the sealing core 2 to provide stepped holes for a tight connection with the flange body 1 and the sealing core 2, thereby improving the stability of the device during use.

[0047] In another embodiment, a warning sign 5 is provided on the outer side of the flange body 1 by rivets or welding. A warning slogan and a reflective surface are provided on the warning sign 5 to warn the staff of the location of the device, thereby improving the safety of the device.

[0048] Working principle: First, place the flange body 1 at the wellhead of the oil well, connect the flange at the wellhead by passing the bolts through the connecting hole 11, and fix the flange body 1 at the wellhead of the oil well, then place the sealing core 2 in the through hole in the middle of the flange body 1, then place the left cover plate 31 and the right cover plate 32 on the flange body 1, and make the through holes of the left connecting ear 311 and the right connecting ear 321 overlap, then pass the core shaft 4 through the through holes of the left connecting ear 311 and the right connecting ear 321, and make the bottom of the core shaft 4 pass through the connecting hole 11. The ear plate 13 inserts the pin into the through hole at the bottom of the core shaft 4 to temporarily limit the core shaft 4 to prevent the core shaft 4 from falling off; the oil pipe is inserted into the through hole in the middle of the sealing core 2 so that one end of the oil pipe can penetrate into the oil well, the left cover plate 31 and the right cover plate 32 are moved closer to the sealing core 2, the connecting shaft 33 is rotated so that the connecting shaft 33 enters the slot 313, and the locking nut 34 is rotated to move it toward the clamping plate 312, so that the left cover plate 31 and the right cover plate 32 clamp the sealing core 2, thereby improving the practicability of the device.

[0049] The parts not described in detail in the present invention are all conventional technical means known to those skilled in the art.

[0050] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0051] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0052] 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.

[0053] Finally, it should be noted that the above description is only a preferred embodiment of the utility model and is not intended to limit the utility model. Although the utility model is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions recorded in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. An oil well sealing head device, characterized in that: include: A flange body (1) is arranged at the wellhead of an oil well. The flange body (1) has an axial opening at the center. A sealing core (2) is arranged in the hole. The sealing core (2) is made of a flexible material. The sealing core (2) has an axial opening at the center for sealing the outer diameter of an oil pipe. A clamping cover plate assembly (3) is arranged above the flange body (1) for clamping the sealing core (2) and the outer diameter of the oil pipe.

2. The oil well sealing head device according to claim 1, characterized in that: The clamping cover plate assembly (3) comprises a left cover plate (31) and a right cover plate (32); a left connecting ear (311) is arranged at one end of the left cover plate (31), and a through hole is formed in the left connecting ear (311); a right connecting ear (321) is arranged at one end of the right cover plate (32), and a through hole is formed in the right connecting ear (321); the through holes of the left connecting ear (311) and the right connecting ear (321) are arranged to overlap; a core shaft (4) is arranged in the through holes of the left connecting ear (311) and the right connecting ear (321); the left connecting ear (311) and the right connecting ear (321) are capable of rotating around the core shaft (4); the axis of the core shaft (4) is parallel to the axis of the through hole of the flange body (1); and the core shaft (4) is used to connect the clamping cover plate assembly (3) and the flange body (1).

3. The oil well sealing head device according to claim 2, characterized in that: The clamping cover plate assembly (3) further comprises a connecting shaft (33), one end of which is movably arranged at an end of the right cover plate (32) away from the right connecting ear (321), a locking nut (34) is arranged on the other end of the connecting shaft (33), the locking nut (34) is threadedly connected to the connecting shaft (33) and is movable along the length direction of the connecting shaft (33), and a clamping plate (312) is arranged at an end of the left cover plate (31) away from the left connecting ear (311), a slot (313) is provided on the clamping plate (312), and the slot (313) is used to accommodate the connecting shaft (33).

4. The oil well sealing head device according to claim 3, characterized in that: A flat washer (331) is sleeved on the connecting shaft (33). The flat washer (331) is located on the inner side of the locking nut (34) close to the center of the connecting shaft (33). The diameter of the flat washer (331) is greater than the width of the slot (313).

5. The oil well sealing head device according to claim 4, characterized in that: A sealing ring is provided at the bottom of the flange body (1), and a connecting hole (11) is provided on the sealing ring for connecting to an oil well head. Support plates (12) are symmetrically provided on both sides of the flange body (1). The support plates (12) are located below the clamping cover plate assembly (3) and the two are in contact with each other, and are used to support the clamping cover plate assembly (3). A connecting ear plate (13) is provided on the outer wall of the flange body (1), and the connecting ear plate (13) is connected to the clamping cover plate assembly (3) through a core shaft (4). A vent hole (14) is provided through the side wall of the flange body (1), and a dust plug (15) is provided at the outer opening of the vent hole (14).

6. The oil well sealing head device according to claim 5, characterized in that: A connecting head (332) is provided at one end of the connecting shaft (33) away from the locking nut (34). A through hole is provided on the connecting head (332). A bolt is provided in the through hole and is movably connected to the right connecting ear (321) through the bolt.

7. The oil well sealing head device according to claim 6, characterized in that: An oil cup (41) is provided at the center of the core shaft (4), the oil cup (41) and the core shaft (4) are arranged coaxially, a plurality of oil outlet holes (42) are provided on the side wall of the core shaft (4) along the axis, the oil outlet holes (42) are communicated with the oil cup (41) and are used for oil outlet to lubricate the through holes of the left connecting ear (311) and the right connecting ear (321).

8. The oil well sealing head device according to claim 7, characterized in that: The longitudinal section of the sealing core (2) is in the shape of a funnel that is wide at the top and narrow at the bottom, and a clamping table is provided on the inclined surface of the funnel for supporting the sealing core (2). The upper side of the through hole of the flange body (1) matches the shape and size of the upper side of the sealing core (2), and stepped holes are provided on the inner sides of the left cover plate (31) and the right cover plate (32) at positions that match the tops of the flange body (1) and the sealing core (2).

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