Wellhead blowout preventer for petroleum drilling

Abstract

The utility model relates to the technical field of wellhead blowout prevention, in particular to a wellhead blowout prevention device for petroleum drilling, which comprises a blowout preventer, a plurality of limiting cylinders, a knife rest, supporting blocks and clamping blocks, the limiting cylinders are fixedly connected onto the blowout preventer, the supporting blocks are fixedly connected onto the limiting cylinders, the clamping blocks are slidably arranged in two of the limiting cylinders, and the knife rest is fixedly connected onto the supporting blocks. And knife rests are arranged in the other two limiting cylinders in a sliding manner. A first motor is started, so that an output shaft of the first motor drives a gear to rotate, the gear is meshed with a gear ring, the gear ring rotates to drive a U-shaped frame on the gear ring to rotate, the U-shaped frame rotates to stir a convex block and a locking shaft on the convex block to rotate at the same time, and therefore the locking shaft can be automatically rotated; the locking shaft is tightly fixed to the limiting cylinder, it is guaranteed that the tool rest and the clamping block are not prone to displacement, and the tool rest and the clamping block are prevented from being broken through by petroleum.

Description

TECHNICAL FIELD

[0001] The utility model relates to wellhead blowout preventer technology field especially relates to a petroleum drilling wellhead blowout preventer. BACKGROUND

[0002] The petroleum drilling wellhead blowout preventer is the key safety equipment for preventing blowout, is installed at the wellhead, can close the well shaft rapidly under the emergency, prevents the formation fluid from uncontrolledly gushing to the ground.

[0003] The patent with the authorized announcement number CN214221139U discloses a gate blowout preventer for oilfield wellhead, which comprises a rectangular shell, an adjusting screw, a wheel disc, a blowout pipe, a first butt joint disc, a fastening screw, a second butt joint disc, a butt joint hole, a limiting groove, a gasket, an observation window, a sealing plate and a bearing; when using the patent, the wheel disc needs to be manually rotated to drive the adjusting screw to rotate, so that the sealing plate is sealed to prevent blowout; since the adjusting screw of the above-mentioned existing patent is a locking shaft used for fixing the sealing plate to prevent displacement, but when the above-mentioned existing patent is used to manually rotate the adjusting screw, the two sealing plates cannot be completely closed, and only relying on the thread, under the action of high pressure, the sealing plate is easily opened by oil, which causes deformation or rupture.

[0004] Therefore, it is necessary to provide a petroleum drilling wellhead blowout preventer capable of automatically rotating the locking shaft. UTILITY MODEL CONTENT

[0005] In order to overcome the shortcomings that when the above-mentioned existing patent is used to manually rotate the adjusting screw, the two sealing plates cannot be completely closed, and only relying on the thread, under the action of high pressure, the sealing plate is easily opened by oil, which causes deformation or rupture, the utility model provides a petroleum drilling wellhead blowout preventer capable of automatically rotating the locking shaft.

[0006] In order to achieve the above-mentioned problems, the utility model adopts the following technical scheme: a petroleum drilling wellhead blowout preventer, which comprises a blowout preventer, a limiting cylinder, a tool holder, a supporting block and a clamping block, a plurality of limiting cylinders are fixedly connected to the blowout preventer, a supporting block is fixedly connected to the limiting cylinder, a clamping block is slidably arranged in two limiting cylinders, and a tool holder is slidably arranged in the other two limiting cylinders; the blowout preventer further comprises a locking shaft, a first supporting frame, a first motor, a gear, a gear ring, a U-shaped frame and a protruding block, the locking shaft is threadedly arranged on the two clamping blocks and the two tool holders, the first supporting frame is fixedly connected to the supporting block, the first motor is installed on the first supporting frame, the output shaft of the first motor is key-connected with the gear, the gear ring is rotatably arranged on the first supporting frame and engaged with the gear, the U-shaped frame is fixedly connected to the gear ring, and the protruding block is fixedly connected to the locking shaft and located in the U-shaped frame.

[0007] As a preferred technical scheme of the utility model, it further comprises a support, a storage frame, a cover plate, a solenoid valve and a liquid outlet pipe, the support is fixedly connected to the first support frame, the storage frame is fixedly connected to the support, the cover plate covers the storage frame, the liquid outlet pipe is connected to the storage frame, and the solenoid valve is arranged on the liquid outlet pipe.

[0008] As a preferred technical scheme of the utility model, it further comprises a second support frame, a second motor, a threaded rod and a clamping block, the second support frame is fixedly connected to the first support frame close to the tool holder, the second motor is installed on the second support frame, the threaded rod is installed on the output shaft of the second motor through a shaft coupling, and the clamping block is threadedly arranged on the threaded rod.

[0009] As a preferred technical scheme of the utility model, it further comprises a limiting sheet, and the limiting sheet is fixedly connected to the threaded rod.

[0010] As a preferred technical scheme of the utility model, it further comprises a gasket, and the gasket is embeddedly arranged on the clamping block.

[0011] As a preferred technical scheme of the utility model, a hand wheel is fixedly connected to the locking shaft.

[0012] As a preferred technical scheme of the utility model, the two clamping blocks are annular sealing members.

[0013] As a preferred technical scheme of the utility model, a hydraulic oil passage is formed in the limiting cylinder.

[0014] Compared with the prior art, the utility model has the following technical effects: 1. By starting the first motor, the output shaft of the first motor drives the gear to rotate, the gear is engaged with the gear ring, the gear ring drives the U-shaped frame on the gear ring to rotate, and the U-shaped frame drives the locking shaft to rotate while rotating, so that the locking shaft is tightly fixed on the limiting cylinder to ensure that the position of the tool holder and the clamping block is not easily displaced, and the tool holder and the clamping block are prevented from being pushed open by oil.

[0015] 2. By starting the solenoid valve, the lubricating oil in the storage frame flows out of the liquid outlet pipe, so that the lubricating oil can be dropped on the gear and the gear ring, and the gear and the gear ring can be lubricated, thereby preventing the gear and the gear ring from being worn by mutual friction.

[0016] 3. By starting the second motor, the output shaft of the second motor drives the threaded rod to rotate, so that the threaded rod drives the clamping block on the threaded rod to move inward, thereby limiting the drill rod, supporting the drill rod after the blowout preventer is started, and preventing the drill rod from falling after being cut off. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the utility model.

[0018] Figure 2 It is the three-dimensional section structure schematic view of the blowout preventer and the limiting cylinder of the utility model.

[0019] Figure 3 It is the three-dimensional section structure schematic view of the locking shaft and the clamping block of the utility model.

[0020] Figure 4 It is the three-dimensional structure schematic view of the first support frame, the first motor and the gear of the utility model.

[0021] Figure 5 It is the three-dimensional structure schematic view of the storage frame, the cover plate and the electromagnetic valve of the utility model.

[0022] Figure 6 It is the three-dimensional structure schematic view of the second support frame, the second motor and the clamping block of the utility model.

[0023] Marked in the figure: 1 - blowout preventer, 2 - limiting cylinder, 201 - support block, 3 - locking shaft, 4 - clamping block, 5 - tool holder, 6 - first support frame, 7 - first motor, 8 - gear, 9 - gear ring, 10 - U-shaped frame, 11 - protruding block, 12 - support, 13 - storage frame, 14 - cover plate, 15 - electromagnetic valve, 16 - liquid outlet pipe, 17 - second support frame, 1701 - second motor, 18 - threaded rod, 19 - clamping block, 20 - limiting sheet, 21 - gasket, 22 - hand wheel. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below in combination with the drawings and specific embodiments, but not limit the protection scope and application scope of the utility model.

[0025] Example 1: a kind of blowout preventer of petroleum drilling well mouth, refer to Figures 1-5As shown, including the blowout preventer 1, limit cylinder 2, tool holder 5, support block 201 and clamping block 4, blowout preventer 1 left and right two sides are symmetrically arranged by welding limit cylinder 2, limit cylinder 2 outside fixedly connected with support block 201, two below the limit cylinder 2 is slidably provided with clamping block 4, two clamping block 4 inward and contact, two tool holders 5 are slidably arranged in the two upper limit cylinder 2, two tool holders 5 inward and contact, further comprising a locking shaft 3, a first support frame 6, a first motor 7, a gear 8, a gear ring 9, a U-shaped frame 10 and a protruding block 11, two clamping block 4 and two tool holders 5 are all provided with locking shaft 3 in screw mode, locking shaft 3 in the similar limit cylinder 2 and support block 201 sliding, locking shaft 3 on the clamping block is clamped into the groove on the limit cylinder 2, the outer side of the support block 201 is fixedly connected with the first support frame 6, the outer side of the upper part of the first support frame 6 is provided with the first motor 7 in bolt connection mode, the output shaft of the first motor 7 is keyed connected with the gear 8, the lower part of the outer side of the first support frame 6 is rotatably provided with the gear ring 9, the locking shaft 3 rotates in the gear ring 9, the gear ring 9 is engaged with the gear 8, the outer side of the gear ring 9 is fixedly connected with the U-shaped frame 10, the outer end of the locking shaft 3 is fixedly connected with the protruding block 11, and the protruding block 11 is located in the U-shaped frame 10.

[0026] Referring to Figure 3 As shown, further comprising a hand wheel 22, the end of the locking shaft 3 is fixedly connected with the hand wheel 22.

[0027] Referring to Figure 2 As shown, two tool holders 5 are gate blowout preventer assemblies, and two clamping blocks 4 are annular seal blowout preventer assemblies, which are double blowout preventer structures.

[0028] Referring to Figure 3 As shown, the limit cylinder 2 is provided with a hydraulic oil passage.

[0029] When drilling oil, first install the blowout preventer in the corresponding position, then insert the drill pipe into the center of the blowout preventer 1, so that the drill pipe is between the two clamping blocks 4 and the two tool holders 5. When the pressure in the well abnormally rises, inject high-pressure medium into the limiting cylinder 2 through the hydraulic oil channel, so that the high-pressure medium extrudes the corresponding tool holder 5 and clamping block 4 in the limiting cylinder 2 to move inward, so that the two tool holders 5 completely seal the wellhead, and the clamping block 4 tightly wraps the drill string. When the tool holder 5 and the clamping block 4 move inward, the locking shaft 3 on them also moves. After the wellhead is sealed, start the first motor 7, so that the output shaft of the first motor 7 drives the gear 8 to rotate. The gear 8 is engaged with the gear ring 9, and the rotation of the gear ring 9 drives the U-shaped frame 10 on it to rotate. The U-shaped frame 10 rotates and drives the protruding block 11 and the locking shaft 3 on it to rotate, so that the locking shaft 3 can be automatically rotated, and the locking shaft 3 is tightly fixed on the limiting cylinder 2 to ensure that the position of the tool holder 5 and the clamping block 4 is not easily displaced, avoiding that the oil will push the tool holder 5 and the clamping block 4 apart. After the locking shaft 3 is tightly fixed on the limiting cylinder 2, the first motor 7 can be turned off. The hand wheel 22 can be used when the first motor 7 is damaged, to ensure the normal use of the locking shaft 3.

[0030] Example 2: Based on example 1, refer to Figure 1 and Figure 5 It also includes a support 12, a storage frame 13, a cover plate 14, a solenoid valve 15 and a liquid outlet pipe 16. The first support frame 6 is fixedly connected with the support 12 at the top. The support 12 is fixedly connected with the storage frame 13. The storage frame 13 is covered with the cover plate 14 at the top. The storage frame 13 is connected with the liquid outlet pipe 16 at the bottom. The liquid outlet pipe 16 is provided with the solenoid valve 15 in the middle.

[0031] Before the gear 8 and the gear ring 9 need to be used again, the solenoid valve 15 is started to make the lubricating oil in the storage frame 13 flow out of the liquid outlet pipe 16. In this way, the lubricating oil can be dropped on the gear 8 and the gear ring 9, and the gear 8 and the gear ring 9 can be lubricated, avoiding abrasion caused by mutual friction of the gear 8 and the gear ring 9. The cover plate 14 can be opened to add lubricating oil to the storage frame 13.

[0032] Referring to Figure 1 and Figure 6 It also includes a second support frame 17, a second motor 1701, a threaded rod 18 and a clamping block 19. The second support frame 17 is fixedly connected with the first support frame 6 near the tool holder 5. The second support frame 17 is provided with the second motor 1701 at the top by bolt connection. The output shaft of the second motor 1701 is provided with the threaded rod 18 by a shaft coupling. The threaded rod 18 is provided with the clamping block 19 in a threaded manner. The two clamping blocks 19 are in contact and located above the blowout preventer 1.

[0033] Referring to Figure 6As shown, the device further comprises a limiting sheet 20, and the end of the threaded rod 18 is fixedly connected with the limiting sheet 20, so as to prevent the clamp block 19 from falling off the threaded rod 18.

[0034] Referring to Figure 6 As shown, the device further comprises a gasket 21, and the gasket 21 is embedded in the inner side of the clamp block 19.

[0035] When the drilling tool is used for drilling, the second motor 1701 is started, the output shaft of the second motor 1701 drives the threaded rod 18 to rotate, the threaded rod 18 drives the clamp block 19 on the threaded rod 18 to move inward, so that the drill rod can be limited, and the drill rod can be supported after the blowout preventer 1 is started, so as to avoid the drill rod from falling down after being cut off, the gasket 21 increases the friction between the clamp block 19 and the drill rod, so as to better clamp the drill rod and avoid the drill rod from falling down, and the limiting sheet 20 can prevent the clamp block 19 from falling off the threaded rod 18.

[0036] The above embodiment is only for illustrating the technical concept and characteristics of the utility model, and the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model. Any equivalent change or modification according to the spirit and essence of the utility model shall be covered within the protection scope of the utility model.

Claims

1. A blowout preventer for oil drilling wellheads, comprising a blowout preventer (1), a limiting cylinder (2), a cutter holder (5), a supporting block (201) and a clamping block (4), a plurality of limiting cylinders (2) are fixedly connected to the blowout preventer (1), the supporting block (201) is fixedly connected to the limiting cylinder (2), the clamping block (4) is slidingly arranged in two limiting cylinders (2), and the cutter holder (5) is slidingly arranged in the other two limiting cylinders (2), characterized in that, The utility model also includes locking shaft (3), first support frame (6), first motor (7), gear (8), gear ring (9), U-shaped frame (10) and lug (11), two clamping blocks (4) and two tool holders (5) are provided with locking shaft (3) threadedly, the support block (201) is fixedly connected with first support frame (6), first support frame (6) is installed with first motor (7), the output shaft of first motor (7) is keyed with gear (8), First support frame (6) is rotatably provided with gear ring (9), gear ring (9) is engaged with gear (8), gear ring (9) is fixedly connected with U-shaped frame (10), lug (11) is fixedly connected on locking shaft (3), and lug (11) is located in U-shaped frame (10).

2. A blowout preventer for oil drilling wellheads according to claim 1, characterized in that, The utility model also includes support (12), storage frame (13), cover plate (14), electromagnetic valve (15) and liquid outlet pipe (16), first support frame (6) is fixedly connected with support (12), support (12) is fixedly connected with storage frame (13), storage frame (13) is covered with cover plate (14), and storage frame (13) is connected with liquid outlet pipe (16), and electromagnetic valve (15) is arranged on liquid outlet pipe (16).

3. A blowout preventer for oil drilling wellheads according to claim 2, characterized in that, The utility model also includes second support frame (17), second motor (1701), threaded rod (18) and clamping block (19), and the first support frame (6) close to tool holder (5) is fixedly connected with second support frame (17), second support frame (17) is installed with second motor (1701), and the output shaft of second motor (1701) is installed with threaded rod (18) through the shaft coupling, and clamping block (19) is threadedly arranged on threaded rod (18).

4. A blowout preventer for oil drilling wellheads according to claim 3, characterized in that, The utility model also includes limiting sheet (20), and limiting sheet (20) is fixedly connected on threaded rod (18).

5. A blowout preventer for oil drilling wellheads according to claim 4, characterized in that, The utility model also includes gasket (21), and gasket (21) is embeddedly arranged on clamping block (19).

6. A blowout preventer for oil drilling wellheads according to claim 5, characterized in that, The utility model also includes hand wheel (22), and hand wheel (22) is fixedly connected on locking shaft (3).

7. A blowout preventer for oil drilling wellheads according to claim 6, characterized in that, Two clamping blocks (4) are annular seals.

8. A blowout preventer for oil drilling wellheads according to claim 7, characterized in that, The limiting barrel (2) is opened with hydraulic oil passage.

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