Blowout preventer for oil and gas development

Abstract

The utility model discloses a blowout preventer for oil and gas development, which is applied to the technical field of oil and gas development and comprises an upper shell and a lower shell, a drill rod is rotatably connected inside the upper shell and the lower shell in a penetrating manner, and an elastic rubber core which is respectively connected with the upper shell and the lower shell in a sliding manner is sleeved on the surface of the drill rod. Hydraulic oil is injected into the lower piston groove during blowout, the piston pushes the elastic rubber core to close and seal the surface of the drill rod, and therefore blowout can be interrupted. And meanwhile, blowout oil gas can be sprayed out through the oil discharge hole and is blocked by the baffle plate, so that the blowout oil gas flows around. Therefore, drill rod equipment can be prevented from being damaged, and practicability is improved. The annular gear is meshed with the gear to drive the bolt rod at the bottom of the connecting flange to rotate synchronously, so that the bolt rod is meshed with the oil well pipe orifice in a threaded mode. Therefore, the blowout device can be quickly installed on the top of the oil well pipe orifice, operation is convenient, and installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to oil and gas development technical field, especially relate to a blowout preventer for oil and gas development. BACKGROUND

[0002] The blowout preventer needs to be used to close the oil well during oil and gas development, so as to prevent blowout accidents.

[0003] At present, the Chinese utility model with the announcement number CN218934370U discloses a blowout preventer for oil and gas development. The existing blowout preventer is generally welded with a flange at the bottom to facilitate the bolted fixing of the flange of the oil well mouth. However, this installation method needs to rotate and install multiple bolts in sequence, which is relatively troublesome to operate and cannot quickly bolt the blowout preventer, so the practicality is relatively low. Moreover, when the existing blowout preventer interrupts blowout, time is needed to control the close adhesion of the internal rubber core and the surface of the drill pipe, so part of the oil and gas will still be directly sprayed out. This part of the oil and gas will be sprayed out through the gap between the blowout preventer and the surface of the drill pipe. Due to high temperature and high pressure, it is often sprayed very high, which is easy to penetrate into the driving structure at the top of the drill pipe and cause damage to the motor and other power equipment. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a blowout preventer for oil and gas development, which has the advantages of shielding and protecting the sprayed oil and gas and facilitating the installation of the blowout preventer to the oil well mouth.

[0005] The above technical purpose of the utility model is realized by the following technical scheme: a blowout preventer for oil and gas development, which comprises an upper shell and a lower shell, a drill pipe is rotatably connected inside the upper shell and the lower shell, an elastic rubber core is sleeved on the surface of the drill pipe and is slidably connected with the upper shell and the lower shell respectively, a piston that cooperates with the elastic rubber core is slidably connected inside the lower shell, an upper piston groove and a lower piston groove are respectively formed at the top and the bottom of the piston, and a lower oil injection valve and an upper oil injection valve that cooperate with the lower piston groove and the upper piston groove are fixedly connected on both sides of the surface of the upper shell.

[0006] The above technical scheme is adopted, hydraulic oil is injected into the lower piston groove when blowout occurs, the piston pushes the elastic rubber core to fold and seal the surface of the drill pipe, so that blowout can be interrupted. At the same time, the oil and gas from blowout can be sprayed outwards through the oil discharge hole and shielded by the shielding plate, so that it flows away in all directions. In this way, the damage to the drill pipe equipment can be avoided, and the practicality is improved. The bolt rod at the bottom of the connecting flange is driven to rotate synchronously through the meshing of the ring gear and the gear, so that the bolt rod is engaged with the threads of the oil well pipe mouth. In this way, the blowout preventer can be quickly installed at the top of the oil well pipe mouth, which is convenient to operate and improves the installation efficiency.

[0007] The utility model further sets up: the inside of upper casing and lower casing is equipped with the oil gas passage of cooperation with drill pipe, the top of upper casing is equipped with the oil discharge hole of communication with oil gas passage, the top of upper casing is welded with the baffle of rotation sleeve connection with drill pipe.

[0008] Adopt above technical scheme, the oil gas of blowout is sprayed outward through oil discharge hole, and is shielded through baffle, makes it flow to all around. Further can avoid damaging drill pipe equipment.

[0009] The utility model further sets up: the bottom of lower casing is bolted with the connecting flange, the bottom of connecting flane is equipped with the oil well pipe orifice of sliding sleeve connection with drill pipe, the inside rotation sleeve connection of connecting flange is equipped with ring gear, the surface of ring gear is engaged with the gear of rotation connection with connecting flange, the bottom of gear is welded with the bolt rod of screw connection with oil well pipe orifice, the bottom of oil well pipe orifice is provided with the nut of screw connection with bolt rod.

[0010] Adopt above technical scheme, can install blowout preventer to the top of oil well pipe orifice fast, improve installation efficiency.

[0011] The utility model further sets up: the top of upper casing is equipped with the connecting bolt of bolt connection with lower casing.

[0012] Adopt above technical scheme, bolt fixed together with upper casing and lower casing, thereby can dismantle each other and replace internal parts.

[0013] The utility model further sets up: the one end of lower oil injection valve and upper oil injection valve close to upper casing is fixed with the sealing ring of adhesion with upper casing.

[0014] Adopt above technical scheme, improve the sealing property, prevent hydraulic oil from leaking outward.

[0015] The utility model further sets up: the inside rotation connection of connecting flange is equipped with the ball of sliding connection with ring gear inner surface.

[0016] Adopt above technical scheme, reduce the friction between ring gear rotation and connecting flange, improve rotation stability.

[0017] The utility model further sets up: the one side of connecting flange top is equipped with the hexagonal screw head of rotation connection with gear welding.

[0018] Adopt above technical scheme, through twisting hexagonal screw head to facilitate driving gear rotation, make bolt rod and oil well pipe orifice thread engagement and connect.

[0019] Summarized above, the utility model has following beneficial effect:

[0020] 1, by the blowout to the inside of the lower piston groove injection hydraulic oil, the piston push spring rubber core to the surface of the drill pipe seal, so that the blowout can be interrupted. At the same time, the oil and gas blowout can be sprayed out through the oil hole, and the shielding plate is shielded, so that it flows around. Further can avoid damage to the drilling equipment, improve the practicability;

[0021] 2, by the ring gear and gear meshing with each other to drive the bolt rod at the bottom of the connecting flange to rotate synchronously, so that the bolt rod is engaged with the oil well pipe thread. Thus, the blowout preventer can be quickly installed on the top of the oil well pipe, which is convenient to operate and improves the installation efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is the structure diagram of the utility model;

[0023] Figure 2 is the structure section view of the utility model;

[0024] Figure 3 is the structure diagram of the ring gear of the utility model;

[0025] Figure 4 is the A point of the utility model Figure 2 enlarged view.

[0026] Fig. 1, the upper shell; 2, the lower shell; 3, drill pipe; 4, spring rubber core; 5, piston; 6, lower piston groove; 7, upper piston groove; 8, lower oil injection valve; 9, upper oil injection valve; 10, oil hole; 11, oil and gas passage; 12, connecting flange; 13, oil well pipe; 14, ring gear; 15, gear; 16, bolt rod; 17, nut; 18, connecting bolt; 19, sealing ring; 20, ball; 21, hexagonal screw head; 22, shielding plate. DETAILED DESCRIPTION

[0027] The utility model will be further explained in detail in connection with the drawings.

[0028] Example 1:

[0029] Reference Figure 1 , Figure 2The utility model provides an oil and gas development blowout preventer, including upper casing 1 and lower casing 2, the inside of upper casing 1 and lower casing 2 is through rotationally connected with drill pipe 3, the surface of drill pipe 3 is equipped with the elastic rubber core 4 of sliding connection respectively with upper casing 1 and lower casing 2, the inside of lower casing 2 is slidingly connected with piston 5 of cooperation with elastic rubber core 4, and the top and bottom of piston 5 are provided with upper piston groove 7 and lower piston groove 6 respectively, the both sides of the surface of upper casing 1 are fixedly connected with lower oil injection valve 8 and upper oil injection valve 9 of cooperation with lower piston groove 6 and upper piston groove 7 respectively, and the inside of upper casing 1 and lower casing 2 is through being provided with oil and gas passage 11 of cooperation with drill pipe 3, the top of upper casing 1 is provided with the oil discharge hole 10 of communication with oil and gas passage 11, and the top of upper casing 1 is welded with the baffle 22 of rotationally sleeved with drill pipe 3. When the blowout, inject hydraulic oil into the inside of lower piston groove 6, make piston 5 push elastic rubber core 4 and seal up the surface of drill pipe 3, to can interrupt blowout. The oil and gas of blowout can be sprayed outward through the oil discharge hole 10 simultaneously, and is shielded through the baffle 22, makes it flow to the four around. Further can avoid the damage of drill pipe equipment, improves practicality.

[0030] Reference Figure 1 , Figure 2 The top of upper casing 1 is through screwing and is connected with the connecting bolt 18 of bolt connection with lower casing 2. Bolt connection and fixed together with upper casing 1 and lower casing 2, to can dismantle the inside spare parts and replace each other.

[0031] Reference Figure 2 The end of lower oil injection valve 8 and upper oil injection valve 9 close to upper casing 1 is all fixedly sleeved with sealing ring 19 of adhesion with upper casing 1. Improve the leakproofness, prevent hydraulic oil from leaking outward.

[0032] Brief use process: through the inside of lower piston groove 6 is injected with hydraulic oil by using lower oil injection valve 8, makes it produce pressure and push piston 5 to slide up, to make piston 5 push elastic rubber core 4 and gather up, and make elastic rubber core 4 precision and fit on the surface of drill pipe 3 and hold up drill pipe 3, further seal the oil and gas pipe orifice to interrupt blowout. The oil and gas of spray in the process of elastic rubber core 4 gathering up will move upwards through the inside of oil and gas passage 11, and is sprayed outward from the inside of oil discharge hole 10, again through the baffle 22 and shield oil and gas, after losing the spray power of oil and gas, finally from the surface of the top of upper casing 1 and flow outward. When need to open elastic rubber core 4, only need to inject hydraulic oil into the inside of lower piston groove 6 by using lower oil injection valve 8, and inject hydraulic oil into the inside of upper piston groove 7 by using upper oil injection valve 9, to push piston 5 to slide down, and elastic rubber core 4 can restore under the elastic force of itself.

[0033] Example 2:

[0034] Reference Figure 1 , Figure 2 ,Figure 3 、 Figure 4 The blowout preventer for oil and gas development, the bottom of the lower shell 2 is bolted with a connecting flange 12, the bottom of the connecting flange 12 is provided with an oil well pipe orifice 13 which is sleeved with the drill pipe 3, the inside of the connecting flange 12 is rotatably sleeved with a ring gear 14, the surface of the ring gear 14 is engaged with a gear 15 which is rotatably connected with the connecting flange 12, the bottom of the gear 15 is welded with a bolt rod 16 which is threadedly connected with the oil well pipe orifice 13, and the bottom of the oil well pipe orifice 13 is provided with a nut 17 which is threadedly connected with the bolt rod 16. The bolt rod 16 at the bottom of the connecting flange 12 is driven to rotate synchronously through the mutual engagement of the ring gear 14 and the gear 15, so that the bolt rod 16 is threadedly engaged with the oil well pipe orifice 13. Therefore, the blowout preventer can be quickly installed on the top of the oil well pipe orifice, and the operation is convenient and the installation efficiency is improved.

[0035] Reference Figure 2 、 Figure 4 The inside of the connecting flange 12 is rotatably connected with a ball 20 which is slidably connected with the inner surface of the ring gear 14. The friction between the ring gear 14 and the connecting flange 12 is reduced when the ring gear 14 rotates, and the rotation stability is improved.

[0036] Reference Figure 2 、 Figure 4 A hexagonal screw head 21 which is welded with the gear 15 is rotatably connected through one side of the top of the connecting flange 12. The gear 15 is driven to rotate through the twisting of the hexagonal screw head 21, so that the bolt rod 16 is threadedly engaged with the oil well pipe orifice 13 for connection.

[0037] The use process is briefly described as follows: the connecting flange 12 at the bottom of the lower shell 2 is aligned with the hole at the top of the oil well pipe orifice 13, and the bolt rod 16 is slid into the inside of the oil well pipe orifice 13. Then the bolt rod 16 at one side is rotated to drive the connecting flange 12 to rotate synchronously through the mutual engagement transmission of the gear 15 and the ring gear 14, so that the bolt rod 16 is threadedly engaged with the oil well pipe orifice 13, and the bolt rod 16 penetrates the inside of the oil well pipe orifice 13. Finally, the nut 17 is rotated and sleeved on the surface of the bolt rod 16.

[0038] This specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution after reading the specification, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

Claims

1. A blowout preventer for oil and gas development, comprising an upper housing (1) and a lower housing (2), characterized in that: The inside of the upper shell (1) and the lower shell (2) is rotatably connected with a drill rod (3), the surface of the drill rod (3) is sleeved with an elastic rubber core (4) which is slidably connected with the upper shell (1) and the lower shell (2) respectively, the inside of the lower shell (2) is slidably connected with a piston (5) which is used in cooperation with the elastic rubber core (4), the top and bottom of the piston (5) are respectively provided with an upper piston groove (7) and a lower piston groove (6), the surface of the upper shell (1) is fixedly connected with a lower oil injection valve (8) and an upper oil injection valve (9) which are used in cooperation with the lower piston groove (6) and the upper piston groove (7) respectively.

2. The blowout preventer for oil and gas development according to claim 1, characterized in that: The inside of the upper shell (1) and the lower shell (2) is rotatably connected with a drill rod (3), the surface of the drill rod (3) is sleeved with an elastic rubber core (4) which is slidably connected with the upper shell (1) and the lower shell (2) respectively, the inside of the lower shell (2) is slidably connected with a piston (5) which is used in cooperation with the elastic rubber core (4), the top and bottom of the piston (5) are respectively provided with an upper piston groove (7) and a lower piston groove (6), the surface of the upper shell (1) is fixedly connected with a lower oil injection valve (8) and an upper oil injection valve (9) which are used in cooperation with the lower piston groove (6) and the upper piston groove (7) respectively.

3. The blowout preventer for oil and gas development of claim 1, wherein: The bottom of the lower shell (2) is bolted with a connecting flange (12), the bottom of the connecting flange (12) is provided with an oil well pipe opening (13) which is slidably sleeved with the drill rod (3), the inside of the connecting flange (12) is rotatably sleeved with a ring gear (14), the surface of the ring gear (14) is engaged with a gear (15) which is rotatably connected with the connecting flange (12), the bottom of the gear (15) is welded with a bolt rod (16) which is threadedly connected with the oil well pipe opening (13), the bottom of the oil well pipe opening (13) is provided with a nut (17) which is threadedly connected with the bolt rod (16).

4. The blowout preventer for oil and gas development of claim 1, wherein: The top of the upper shell (1) is threadedly connected with a connecting bolt (18) which is bolted with the lower shell (2).

5. The blowout preventer for oil and gas development of claim 1, wherein: The end of the lower oil injection valve (8) and the upper oil injection valve (9) near the upper shell (1) is fixedly sleeved with a sealing ring (19) which is bonded with the upper shell (1).

6. The blowout preventer for oil and gas development of claim 3, wherein: The inside of the connecting flange (12) is rotatably connected with a ball (20) which is slidably connected with the inner surface of the ring gear (14).

7. The blowout preventer for oil and gas development of claim 3, wherein: The top of the connecting flange (12) is rotatably connected with a hexagonal screw head (21) which is welded with the gear (15) on one side.

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