High-sealing-performance casing head for oil exploitation

Abstract

The high-sealing-performance casing head for oil exploitation comprises a casing head body, the top end of the casing head body is sleeved with a fixing ring, a grabbing mechanism is arranged at the bottom end of the fixing ring, an outer ring is fixedly installed at the top end of the fixing ring, a clamping mechanism is arranged on the inner side wall of the outer ring, and an input ring is fixedly installed at the top end of the outer ring. According to the scheme, on a specific casing pipe head, the arranged clamping rods can be used for fixing a casing pipe placed in the position where the clamping rods are located, then the casing pipe is lowered to the required standard position through downward movement, then the auxiliary arc rod and the output pipe are moved outwards, and therefore the casing pipe can be fixed. The input ring is arranged in the casing pipe, slurry in the input ring can be conveyed into the casing pipe through the input pipe, and the gravity merging plate at the top end of the input ring rotates and merges while the slurry is input, so that splashing possibly generated in the slurry input process can be blocked, and then the slurry input or grouting efficiency and convenience of the casing pipe are improved.

Description

Technical Field

[0001] The invention relates to the technical field of oil exploitation, in particular to a high-seal casing head for oil exploitation. Background Art

[0002] The casing head is used to fix the wellhead of the well, connect the wellhead casing string, support the gravity of the technical casing and the oil layer casing, seal the annular space between the layers of pipes, provide a transition connection for the installation of the blowout preventer, tubing head, and Christmas tree, and through the two side ports on the casing head body, the outside of the casing can be filled with mud, monitored, and filled with balancing fluid. However, the traditional casing head still has the following defects:

[0003] In the use of traditional casing heads, after the casing is placed into the formation during oil extraction, when the internal filling material is insufficient, the casing may be squeezed and deformed by external pressure. It is necessary to quickly add mud to the inside of the casing after the casing is placed to keep the internal and external pressures consistent. After the casing is completely lowered, grouting is required to achieve cementing. During the process of filling the casing with mud or grouting, the traditional input method requires manually placing the pipe into the casing, and after the input is completed, it is taken out and the multi-layer casing is installed. The steps of repeatedly taking out the pipe in the process are cumbersome, and the traditional casing head cannot disassemble or install the conveying pipeline more conveniently and quickly, which increases the inconvenience of the casing head when using it. Summary of the invention

[0004] The purpose of the present invention is to provide a high-sealing casing head for oil mining to solve the problem proposed in the above-mentioned background technology that the traditional casing head needs to manually put the pipe into the casing after the pipe is lowered and grouting is input. After the input is completed, it is taken out and then the multi-layer casing is installed. The steps of repeatedly taking out the pipe in the process are relatively cumbersome, and the traditional casing head cannot disassemble or install the transmission pipeline more conveniently and quickly.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: A high-sealing casing head for oil mining, comprising a casing head body, a fixing ring is sleeved on the top end of the casing head body, a grabbing mechanism is arranged at the bottom end of the fixing ring, an outer ring is fixedly installed on the top end of the fixing ring, a clamping mechanism is arranged on the inner side wall of the outer ring, an input ring is fixedly installed on the top end of the outer ring, an output mechanism is arranged on the inner side wall of the input ring, a blowout prevention mechanism is arranged on the top end of the input ring, the blowout prevention mechanism comprises an outer cover and a plurality of fixing seats respectively fixedly installed on the top end of the input ring, the inner side walls of the plurality of fixing seats are rotatably connected with a rotating shaft, a gravity merging plate is fixedly installed on the outer side of the rotating shaft, and a guide arc plate is fixedly installed on the inner side wall of the gravity merging plate.

[0006] In order to make the gravity merging plate easier to open and close, as a preferred embodiment of the present invention, the blowout prevention mechanism also includes a plurality of top rods and a winding rod rotatably connected to the inner wall of the outer cover, a plurality of steel wire ropes are fixedly installed on the outer sides of both ends of the winding rod, the other ends of the plurality of steel wire ropes are fixedly connected to the outer side of the gravity merging plate, and a bevel gear is fixedly installed on the outer side of the winding rod and the bottom end of the top rod.

[0007] In order to prevent mud from splashing, as a preferred embodiment of the present invention, the blowout prevention mechanism also includes a winding motor fixedly installed on the top of the outer cover, the output end of the winding motor is fixedly connected to the top of the top rod, a linkage gear is fixedly installed on the outer side of the top rod, the inner side wall of the outer cover is rotatably connected to a linkage gear ring, and the linkage gear is meshed with the linkage gear ring.

[0008] In order to facilitate mud replenishment or grouting operations, as a preferred embodiment of the present invention, the output mechanism includes a plurality of sealing covers and auxiliary covers fixedly installed on the inner side wall of the input ring, the inner side walls of the plurality of sealing covers and auxiliary covers are respectively slidably connected with output pipes and auxiliary arc rods, a connecting rod is fixedly installed between the output pipe and the auxiliary arc rod, the outer sides of the connecting rod are respectively slidably connected with the inner side walls of the sealing cover and the auxiliary cover, a limit spring is fixedly installed on the inner side wall of the sealing cover, and one end of the limit spring is fixedly connected to the other end of the output pipe.

[0009] In order to enable the sleeve to be clamped and fixed, as a preferred embodiment of the present invention, the clamping mechanism includes an inner ring slidably connected to the inner wall of the outer ring, the inner wall of the inner ring is slidably connected to a plurality of clamping rods, the inner walls of the plurality of clamping rods are threadedly connected to displacement screws, the outer side of the displacement screw is rotatably connected to the inner wall of the inner ring, the other end of the displacement screw is fixedly installed with a displacement gear, the outer side of the inner ring is rotatably connected to an adjusting ring, a displacement tooth ring is fixedly installed on the inner wall of the bottom end of the adjusting ring, and the displacement tooth ring is meshed with the displacement gear.

[0010] In order to make it easier to fix the sleeve, as a preferred embodiment of the present invention, the clamping mechanism also includes a driving gear ring fixedly installed on the outside of the adjusting ring, a driving motor is fixedly installed on the inner wall of the outer ring, a driving gear is fixedly installed on the output end of the driving motor, the outer side of the driving gear is rotatably connected to the inner wall of the outer ring, and the driving gear ring is meshed with the driving gear.

[0011] In order to enable the sleeve to move downward to a desired position, as a preferred embodiment of the present invention, the clamping mechanism also includes a plurality of first electric hydraulic rods fixedly installed at the bottom end of the adjusting ring, the bottom ends of the plurality of first electric hydraulic rods are fixedly connected to the inner wall of the bottom end of the outer ring, the top end of the inner ring is slidably connected to a protective ring, and the top end of the protective ring is fixedly connected to the bottom end of the input ring.

[0012] In order to make it easier to disassemble and assemble the fixing ring and the casing head body, as a preferred embodiment of the present invention, the grabbing mechanism includes a plurality of outer boxes fixedly installed at the bottom end of the fixing ring, the inner walls of the plurality of outer boxes are slidably connected with claw clamps, a second electric hydraulic rod is fixedly installed on the outer side of the claw clamp, and the fixed end of the second electric hydraulic rod is fixedly connected to the inner wall of the outer box.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1) The clamping rod can be used to fix the casing in the position, and then move it downward to the required standard position, and then the auxiliary arc rod and the output pipe move outward, so that the mud inside the input ring can be transported to the inside of the casing through the input pipe, and the top gravity merging plate rotates and merges during the input, so as to block the splashing that may be generated during the mud input process, thereby improving the efficiency and convenience of the casing in inputting mud or grouting;

[0015] 2) The steel wire rope is wound up by the winding rod, so that the steel wire rope can pull the gravity merging plate to merge or open the gravity merging plate. The second electric hydraulic rod is also used to drive the claw clamp to move inside the outer box, making it easier to disassemble or install the fixing ring from the casing head body, thereby improving the overall convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 It is a schematic diagram of the structure of the grabbing mechanism of the present invention;

[0018] Figure 3 It is a schematic diagram of the clamping rod structure of the present invention;

[0019] Figure 4 This is a schematic diagram of the gravity merging plate structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the structure of the blowout prevention mechanism of the present invention;

[0021] Figure 6 This is a schematic diagram of the internal structure of the input ring of the present invention;

[0022] Figure 7 It is a schematic diagram of the output mechanism structure of the present invention;

[0023] Figure 8 This is a schematic diagram of the internal structure of the outer ring of the present invention;

[0024] Fig. 9 It is a schematic diagram of the internal structure of the inner ring of the present invention.

[0025] In the figure: 1, casing head body; 2, fixing ring; 3, grabbing mechanism; 31, outer box; 32, claw clamp; 33, second electric hydraulic rod; 4, outer ring; 5, clamping mechanism; 51, inner ring; 52, clamping rod; 53, displacement screw; 54, displacement gear; 55, adjustment ring; 56, displacement gear ring; 57, drive gear ring; 58, drive motor; 59, drive gear; 510, first electric hydraulic rod; 511, protective ring; 6, input ring ; 7. Output mechanism; 71. Sealing cover; 72. Auxiliary cover; 73. Output pipe; 74. Auxiliary arc rod; 75. Connecting rod; 76. Limit spring; 8. Blowout prevention mechanism; 81. Outer cover; 82. Fixed seat; 83. Rotating shaft; 84. Gravity merging plate; 85. Guide arc plate; 86. Push rod; 87. Winding rod; 88. Wire rope; 89. Bevel gear; 810. Winding motor; 811. Linkage gear; 812. Linkage gear ring. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention 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.

[0027] See also Figure 1-9 , the present invention provides a technical solution:

[0028] A high-seal casing head for oil mining comprises a casing head body 1, a fixing ring 2 is sleeved on the top end of the casing head body 1, a gripping mechanism 3 is arranged on the bottom end of the fixing ring 2, an outer ring 4 is fixedly installed on the top end of the fixing ring 2, a clamping mechanism 5 is arranged on the inner side wall of the outer ring 4, an input ring 6 is fixedly installed on the top end of the outer ring 4, an output mechanism 7 is arranged on the inner side wall of the input ring 6, a blowout prevention mechanism 8 is arranged on the top end of the input ring 6, the blowout prevention mechanism 8 comprises an outer cover 81 and a plurality of fixing seats 82 respectively fixedly installed on the top end of the input ring 6, a rotating shaft 83 is rotatably connected to the inner side walls of the plurality of fixing seats 82, a gravity merging plate 84 is fixedly installed on the outer side of the rotating shaft 83, and a guide arc plate 85 is fixedly installed on the inner side wall of the gravity merging plate 84.

[0029] In specific use, when using the casing head body 1, the fixing ring 2 can be first fixed to the top position of the casing head body 1 by the grabbing mechanism 3. During the casing lowering process, when the top of the casing is flush with the top of the input ring 6, the outer side of the casing can be clamped by the action of the clamping mechanism 5 inside the outer ring 4, and the casing can be driven to slide downward until the top is flush with the lower end of the input ring 6. At this time, the position of the casing is at a standard height, and the output mechanism 7 inside the input ring 6 can add mud or grouting operations to the inside of the casing. Before grouting, the anti-blowout mechanism 5 can be used to clamp the outer side of the casing. The mechanism 8 closes the top of the casing to prevent liquid splashing during the grouting process. The rotation of the rotating shaft 83 on the fixed seat 82 allows the gravity merging plate 84 to drive the guide arc plate 85 to rotate inward, so that the tops of the multiple gravity merging plates 84 are close to each other, and the bottom end of the guide arc plate 85 is in contact with the top of the input ring 6, so that the liquid in the mud splashing process at the top of the casing can flow back into the casing along the gravity merging plate 84 and the guide arc plate 85, thereby improving the convenience of casing installation and grouting operations.

[0030] In this embodiment: the blowout prevention mechanism 8 also includes a plurality of push rods 86 and a winding rod 87 rotatably connected to the inner wall of the outer cover 81, and a plurality of steel wire ropes 88 are fixedly installed on the outer sides of both ends of the winding rod 87, and the other ends of the plurality of steel wire ropes 88 are fixedly connected to the outer side of the gravity merging plate 84, and a bevel gear 89 is fixedly installed on the outer side of the winding rod 87 and the bottom end of the push rod 86.

[0031] During specific use, when the gravity merging plate 84 needs to be rotated and unfolded to facilitate the lowering operation of the next casing, the top rod 86 drives the winding rod 87 to rotate through the action of the bevel gear 89, so that the winding rod 87 can reel in the wire rope 88, and the gravity merging plate 84 can be pulled by the wire rope 88, so that the gravity merging plate 84 can rotate on the fixed seat 82 through the rotating shaft 83 and unfold outward.

[0032] In this embodiment: the blowout prevention mechanism 8 also includes a winding motor 810 fixedly installed on the top of the outer cover 81, the output end of the winding motor 810 is fixedly connected to the top of the top rod 86, a linkage gear 811 is fixedly installed on the outer side of the top rod 86, and the inner side wall of the outer cover 81 is rotatably connected to a linkage gear ring 812, and the linkage gear 811 is meshed with the linkage gear ring 812.

[0033] During specific use, when multiple push rods 86 need to rotate synchronously, the winding motor 810 can drive one of the push rods 86 to rotate, and then the linkage gear 811 and the linkage gear ring 812 are linked to make the multiple push rods 86 rotate simultaneously.

[0034] In this embodiment: the output mechanism 7 includes a plurality of sealing covers 71 and auxiliary covers 72 fixedly installed on the inner wall of the input ring 6, the inner walls of the plurality of sealing covers 71 and the auxiliary covers 72 are respectively slidably connected with output tubes 73 and auxiliary arc rods 74, a connecting rod 75 is fixedly installed between the output tube 73 and the auxiliary arc rod 74, the outer sides of the connecting rod 75 are respectively slidably connected with the inner walls of the sealing cover 71 and the auxiliary cover 72, a limiting spring 76 is fixedly installed on the inner wall of the sealing cover 71, and one end of the limiting spring 76 is fixedly connected with the other end of the output tube 73.

[0035] During specific use, during the downward movement of the sleeve, the output tube 73 always remains inside the sealing cover 71. When the top end of the sleeve moves downward to a position flush with the bottom end of the input ring 6, the limit spring 76 can exert an elastic force on the output tube 73, so that the output tube 73 can move outward inside the sealing cover 71, and the liquid inlet on the output tube 73 is now separated from the sealing cover 71 and connected to the inside of the input ring 6, so that the mud inside the input ring 6 can flow in through the liquid inlet of the output tube 73 and then be output from the front end, so that the mud is transported to the inside of the sleeve for grouting operation.

[0036] In this embodiment: the clamping mechanism 5 includes an inner ring 51 slidably connected to the inner wall of the outer ring 4, the inner wall of the inner ring 51 is slidably connected to a plurality of clamping rods 52, the inner walls of the plurality of clamping rods 52 are threadedly connected to a displacement screw 53, the outer side of the displacement screw 53 is rotatably connected to the inner wall of the inner ring 51, the other end of the displacement screw 53 is fixedly installed with a displacement gear 54, the outer side of the inner ring 51 is rotatably connected to an adjusting ring 55, a displacement toothed ring 56 is fixedly installed on the inner wall of the bottom end of the adjusting ring 55, and the displacement toothed ring 56 is meshed with the displacement gear 54.

[0037] During specific use, when the lower tube of the sleeve is moved to a position where its top is flush with the top of the input ring 6, the height of the sleeve does not meet the standard. By rotating the adjustment ring 55 inside the outer ring 4, the adjustment ring 55 can drive the displacement gear ring 56 to drive the displacement gear 54. At this time, the displacement gear 54 can drive the displacement screw 53 to rotate inside the inner ring 51, so that the displacement screw 53 can drive the clamping rod 52 to slide on the inner wall of the inner ring 51, gradually approaching the sleeve to grasp and fix the outside of the sleeve.

[0038] In this embodiment: the clamping mechanism 5 also includes a driving gear ring 57 fixedly installed on the outside of the adjusting ring 55, a driving motor 58 is fixedly installed on the inner wall of the outer ring 4, and a driving gear 59 is fixedly installed on the output end of the driving motor 58. The outer side of the driving gear 59 is rotatably connected to the inner wall of the outer ring 4, and the driving gear ring 57 is meshed with the driving gear 59.

[0039] During specific use, when the adjusting ring 55 needs to be rotated, the driving motor 58 can be used to drive the driving gear 59 to rotate, so that the driving gear 59 can act on the driving gear ring 57, so that the driving gear ring 57 and the adjusting ring 55 rotate inside the outer ring 4.

[0040] In this embodiment: the clamping mechanism 5 also includes a plurality of first electric hydraulic rods 510 fixedly installed at the bottom end of the adjusting ring 55, the bottom ends of the plurality of first electric hydraulic rods 510 are fixedly connected to the inner wall of the bottom end of the outer ring 4, the top end of the inner ring 51 is slidably connected with a protective ring 511, and the top end of the protective ring 511 is fixedly connected to the bottom end of the input ring 6.

[0041] During specific use, after the clamping rod 52 clamps and fixes the casing, the inner ring 51 can be driven to move downward by the first electric hydraulic rod 510, so that the casing can be driven by the clamping rod 52 to move downward to a position flush with the bottom end of the input ring 6. At this time, the lower tube height of the casing reaches the required height, and at the same time, the protective ring 511 and the top of the inner ring 51 slide with each other, thereby effectively ensuring that the output pipe 73 is transported to the inside of the casing during grouting.

[0042] In this embodiment: the grabbing mechanism 3 includes a plurality of outer boxes 31 fixedly installed at the bottom end of the fixing ring 2, the inner side walls of the plurality of outer boxes 31 are slidably connected with claw clamps 32, the outer side of the claw clamps 32 is fixedly installed with a second electric hydraulic rod 33, and the fixed end of the second electric hydraulic rod 33 is fixedly connected to the inner side wall of the outer box 31.

[0043] During specific use, when it is necessary to fix the fixing ring 2 on the top of the casing head body 1 to fill the inside of the casing with mud or perform grouting operations, the second electric hydraulic rod 33 can be used to drive the claw clamp 32 to slide inside the outer box 31, so that the claw clamp 32 can fix the fixing ring 2 on the outside of the casing head body 1, thereby making it easier to disassemble or install the fixing ring 2 and the casing head body 1.

[0044] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A casing head with high sealing performance for oil mining, comprising a casing head body (1), characterized in that: The top end of the casing head body (1) is sleeved with a fixing ring (2), the bottom end of the fixing ring (2) is provided with a grabbing mechanism (3), the top end of the fixing ring (2) is fixedly mounted with an outer ring (4), the inner side wall of the outer ring (4) is provided with a clamping mechanism (5), the top end of the outer ring (4) is fixedly mounted with an input ring (6), the inner side wall of the input ring (6) is provided with an output mechanism (7), the top end of the input ring (6) is provided with a blowout prevention mechanism (8), the blowout prevention mechanism (8) comprises an outer cover (81) and a plurality of fixing seats (82) respectively fixedly mounted on the top end of the input ring (6), the inner side walls of the plurality of fixing seats (82) are rotatably connected with a rotating shaft (83), the outer side of the rotating shaft (83) is fixedly mounted with a gravity merging plate (84), and the inner side wall of the gravity merging plate (84) is fixedly mounted with a guide arc plate (85).

2. A high-seal casing head for oil mining according to claim 1, characterized in that: The blowout prevention mechanism (8) further comprises a plurality of push rods (86) and a winding rod (87) rotatably connected to the inner side wall of the outer cover (81); a plurality of steel wire ropes (88) are fixedly mounted on the outer sides of both ends of the winding rod (87); the other ends of the plurality of steel wire ropes (88) are fixedly connected to the outer side of the gravity merging plate (84); and a bevel gear (89) is fixedly mounted on the outer side of the winding rod (87) and the bottom end of the push rod (86).

3. A high-seal casing head for oil mining according to claim 2, characterized in that: The blowout prevention mechanism (8) further comprises a winding motor (810) fixedly mounted on the top of the outer cover (81), the output end of the winding motor (810) being fixedly connected to the top of the push rod (86), a linkage gear (811) being fixedly mounted on the outer side of the push rod (86), a linkage gear ring (812) being rotatably connected to the inner side wall of the outer cover (81), and the linkage gear (811) being meshed with the linkage gear ring (812).

4. The high-seal casing head for oil mining according to claim 1, characterized in that: The output mechanism (7) comprises a plurality of sealing covers (71) and auxiliary covers (72) fixedly mounted on the inner side wall of the input ring (6); the inner side walls of the plurality of sealing covers (71) and the auxiliary covers (72) are respectively slidably connected with output tubes (73) and auxiliary arc rods (74); a connecting rod (75) is fixedly mounted between the output tubes (73) and the auxiliary arc rods (74); the outer sides of the connecting rod (75) are respectively slidably connected with the inner side walls of the sealing cover (71) and the auxiliary cover (72); a limit spring (76) is fixedly mounted on the inner side wall of the sealing cover (71); one end of the limit spring (76) is fixedly connected with the other end of the output tube (73).

5. The high-seal casing head for oil mining according to claim 1, characterized in that: The clamping mechanism (5) comprises an inner ring (51) slidably connected to the inner wall of the outer ring (4); the inner wall of the inner ring (51) is slidably connected to a plurality of clamping rods (52); the inner walls of the plurality of clamping rods (52) are threadedly connected to displacement screws (53); the outer side of the displacement screws (53) is rotatably connected to the inner wall of the inner ring (51); a displacement gear (54) is fixedly mounted on the other end of the displacement screws (53); the outer side of the inner ring (51) is rotatably connected to an adjustment ring (55); a displacement gear ring (56) is fixedly mounted on the inner wall of the bottom end of the adjustment ring (55); and the displacement gear ring (56) is meshed with the displacement gear (54).

6. A high-seal casing head for oil mining according to claim 5, characterized in that: The clamping mechanism (5) further comprises a driving gear ring (57) fixedly mounted on the outer side of the adjusting ring (55); a driving motor (58) is fixedly mounted on the inner side wall of the outer ring (4); a driving gear (59) is fixedly mounted on the output end of the driving motor (58); the outer side of the driving gear (59) is rotatably connected to the inner side wall of the outer ring (4); and the driving gear ring (57) is meshed with the driving gear (59).

7. A high-seal casing head for oil mining according to claim 6, characterized in that: The clamping mechanism (5) further comprises a plurality of first electric hydraulic rods (510) fixedly mounted at the bottom end of the adjusting ring (55), the bottom ends of the plurality of first electric hydraulic rods (510) being fixedly connected to the inner wall of the bottom end of the outer ring (4), the top end of the inner ring (51) being slidably connected to a protective ring (511), the top end of the protective ring (511) being fixedly connected to the bottom end of the input ring (6).

8. The high-seal casing head for oil mining according to claim 1, characterized in that: The gripping mechanism (3) comprises a plurality of outer boxes (31) fixedly mounted at the bottom end of the fixing ring (2); the inner side walls of the plurality of outer boxes (31) are slidably connected with claw clamps (32); a second electric hydraulic rod (33) is fixedly mounted on the outer side of the claw clamp (32); and the fixed end of the second electric hydraulic rod (33) is fixedly connected to the inner side wall of the outer box (31).

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