Wellhead blowout preventer for petroleum gas well

Abstract

The utility model relates to the field of blowout preventers, in particular to a wellhead blowout preventer for a petroleum gas well. The utility model provides a blowout preventer for a wellhead of a petroleum gas well, which can be mounted at the wellhead of the petroleum gas well in a clamping manner and is convenient to operate so as to improve the loading and unloading efficiency. A wellhead blowout preventer of a petroleum gas well comprises an outer barrel, a middle column disc, a spring, side arms and the like, the middle of the outer barrel is slidably connected with the middle column disc, the spring is connected between the middle column disc and the outer barrel, and the upper sides of the front portion and the rear portion of the middle column disc are connected with the side arms. By rotating the lead screw, the lead screw moves downwards in the outer sleeve, the lead screw pushes the limiting ring to move downwards, the limiting ring extrudes the oblique angle clamping rings on the elastic base to be close to each other, the oblique angle clamping rings clamp a well mouth, and the purposes that the device can be installed at the well mouth of a petroleum gas well in a clamping mode, operation is convenient and fast, and the safety is high are achieved. And the loading and unloading efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of blowout prevention devices, in particular to a blowout prevention device at the wellhead of a petroleum gas well. Background Art

[0002] The blowout preventer at the wellhead of a petroleum gas well is an important device to ensure the safety of oil and gas production. It is mainly used to prevent the uncontrolled spraying of underground high-pressure fluid from the wellhead due to various reasons during the drilling, completion and production process.

[0003] Existing blowout preventers at the wellhead of a petroleum gas well are usually installed at the wellhead of the petroleum gas well by bolts to prevent the uncontrolled spraying of high-pressure fluid from the wellhead. However, due to the installation method using bolts, the operation is cumbersome and time-consuming, and it is not easy to disassemble, resulting in low loading and unloading efficiency.

[0004] Therefore, a blowout prevention device for a wellhead of a petroleum gas well has been developed, which can be installed at the wellhead of a petroleum gas well by means of a snap-fitting manner and is easy to operate so as to improve the loading and unloading efficiency. Utility Model Content

[0005] In order to overcome the shortcomings of the existing blowout preventer for a wellhead of a petroleum gas well, which adopts a bolt installation method, is cumbersome to operate, time-consuming, and inconvenient to disassemble, resulting in low loading and unloading efficiency, the utility model provides a blowout preventer for a wellhead of a petroleum gas well, which can be installed at the wellhead of a petroleum gas well by a snap-fitting method, is easy to operate, and is convenient for improving loading and unloading efficiency.

[0006] The technical scheme of the utility model is: a blowout prevention device at the wellhead of a petroleum gas well, comprising an outer cylinder, a middle column disk, a spring, a side arm, a folding arm, a hollow cylinder, a clamping block and a well-closing mechanism, the middle part of the outer cylinder is slidably connected with the middle column disk, a spring is connected between the middle column disk and the outer cylinder, the upper sides of the front and rear parts of the middle column disk are connected with side arms, the upper parts of the side arms are rotatably connected with folding arms, the folding arms are clamped and matched with the outer cylinder, and torsion springs are connected between the folding arms and the connected side arms, at which time the torsion springs are in a deformed state, the lower side of the middle column disk is connected with the hollow cylinder, a plurality of clamping blocks are slidably connected to the hollow cylinder, and the outer cylinder is provided with a well-closing mechanism that can be fixed at the wellhead of the petroleum gas well.

[0007] In one embodiment, the blocks are all wedge-shaped blocks.

[0008] In one embodiment, the well-clamping mechanism includes an outer sleeve, a screw, a limiting ring, an elastic seat and an angled clamping ring. A plurality of outer sleeves are connected to the outer side of the outer sleeve, screws are threadedly connected to the outer sleeves, limiting rings are slidably connected between the lower parts of the outer sleeves, the screws are rotatably connected to the limiting rings, a plurality of elastic seats are connected to the lower part of the outer sleeve, the elastic seats are in contact with the limiting rings, and angled clamping rings are connected to the lower sides of the elastic seats.

[0009] In one embodiment, a handle is provided on the upper side of the screw rod.

[0010] In one embodiment, the beveled snap rings are made of elastic material.

[0011] In one of the embodiments, a positioning mechanism is also included, which includes a guide rail, a side frame, a tail stock and a pitch-adjusting rod. The front and rear sides of the outer cylinder are connected to the guide rails, the side frames are slidably connected to the guide rails, the side frames are rotatably connected to the tail stock, and the front and rear parts of the tail stock are threadedly connected to the pitch-adjusting rod.

[0012] The beneficial effects are as follows: 1. The utility model rotates the screw rod to move downward in the outer sleeve, so that the screw rod pushes the limiting ring to move downward, and the limiting ring squeezes the beveled clamping ring on the elastic seat to approach each other, so that the beveled clamping ring clamps the wellhead, so that it can be installed at the wellhead of the oil and gas well by a clamping method, which is easy to operate and can improve the loading and unloading efficiency.

[0013] 2. The utility model drives the side frame to rotate on the tailstock by rotating the outer cylinder, so that the outer cylinder is vertically located above the wellhead, and then the side frame moves downward on the guide rail so that the outer cylinder covers the wellhead, thereby achieving the effect of being able to position the outer cylinder and facilitating rapid installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a three-dimensional structural schematic diagram of the utility model.

[0015] Figure 2 It is a partial three-dimensional structural cross-sectional schematic diagram of the utility model.

[0016] Figure 3 It is a partial three-dimensional structural cross-sectional schematic diagram of the utility model.

[0017] Figure 4 It is a three-dimensional structural schematic diagram of the well-locking mechanism and the positioning mechanism of the utility model.

[0018] In the accompanying drawings: 1-outer cylinder, 2-middle column disk, 3-spring, 4-side arm, 40-folding arm, 5-hollow cylinder, 50-block, 6-well mechanism, 61-outer sleeve, 62-screw rod, 63-limiting ring, 64-elastic seat, 65-angled clamping ring, 7-positioning mechanism, 71-guide rail, 72-side frame, 73-tail stock, 74-adjustable distance rod. DETAILED DESCRIPTION

[0019] The embodiments of the present utility model are described in detail below with reference to the accompanying drawings.

[0020] A blowout prevention device for a petroleum gas well, such as Figure 1-Figure 3As shown, it includes an outer cylinder 1, a middle column plate 2, a spring 3, a side arm 4, a folding arm 40, a hollow cylinder 5, a clamping block 50 and a well-locking mechanism 6. The middle part of the outer cylinder 1 is slidably connected to the middle column plate 2, and the spring 3 is connected between the middle column plate 2 and the outer cylinder 1. The upper sides of the front and rear parts of the middle column plate 2 are connected to the side arms 4, and the upper parts of the side arms 4 are rotatably connected to the folding arms 40. The folding arms 40 are all engaged with the outer cylinder 1, and the folding arms 40 are connected to the connected side arms 4 with torsion springs. At this time, the torsion spring is in a deformed state, and the lower side of the middle column plate 2 is connected to the hollow cylinder 5, and a plurality of clamping blocks 50 are slidably connected to the hollow cylinder 5. The clamping blocks 50 are all wedge-shaped blocks for easy fixation. The outer cylinder 1 is provided with a well-locking mechanism 6.

[0021] like Figure 1 and Figure 4 As shown, the well-clamping mechanism 6 includes an outer sleeve 61, a screw rod 62, a limiting ring 63, an elastic seat 64 and an angled clamping ring 65. Three outer sleeves 61 are connected to the outside of the outer cylinder 1. The outer sleeves 61 are all threadedly connected to the screw rods 62. The upper sides of the screw rods 62 are provided with handles for easy rotation. Limiting rings 63 are slidably connected between the lower parts of the outer sleeves 61. The screw rods 62 are rotatably connected to the limiting rings 63. Three elastic seats 64 are connected to the lower part of the outer cylinder 1. The elastic seats 64 are all in contact with the limiting rings 63. The lower sides of the elastic seats 64 are connected to angled clamping rings 65. The angled clamping rings 65 are all made of elastic material for easy fixation.

[0022] When the utility model is used, the outer cylinder 1 is first installed at the wellhead of the oil gas well. When the oil gas well sprays gas, the gas squeezes the middle column plate 2 to move upward, the spring 3 is squeezed and contracted, and the side arm 4 moves upward, so that the folding arm 40 moves upward and separates from the outer cylinder 1, and the folding arm 40 is restored to a vertical state by the torsion spring recovery. Then the spring 3 rebounds, so that the folding arm 40 moves downward, the middle column plate 2 moves downward, and the hollow cylinder 5 moves downward. The gas enters the hollow cylinder 5, so that the clamping block 50 moves outward and inserts into the well wall, so that the hollow cylinder 5 is fixed at the wellhead, and the wellhead of the oil gas well is blowout-proofed. When the outer cylinder 1 is installed at the wellhead of the oil gas well, the screw rod 62 can be rotated to make the screw rod 62 move downward in the outer sleeve 61, so that the screw rod 62 pushes the limiting ring 63 to move downward, and the limiting ring 63 squeezes the bevel clamping ring 65 on the elastic seat 64 to be close to each other, so that the bevel clamping ring 65 clamps the wellhead, thereby achieving the effect of being able to be installed at the wellhead of the oil gas well by a clamping method, and the operation is convenient, so as to improve the loading and unloading efficiency.

[0023] like Figure 1 and Figure 4 As shown, it also includes a positioning mechanism 7, which includes a guide rail 71, a side frame 72, a tail stock 73 and a pitch-adjusting rod 74. The front and rear sides of the outer cylinder 1 are connected to the guide rails 71, the side frames 72 are slidably connected to the guide rails 71, the side frames 72 are rotatably connected to the tail stock 73, and the front and rear parts of the tail stock 73 are threadedly connected to the pitch-adjusting rod 74.

[0024] The positioning mechanism 7 of the device can be used to position the outer cylinder 1. When installing the outer cylinder 1, first fix the distance adjusting rod 74 near the wellhead, then rotate the distance adjusting rod 74 to adjust the height of the tail stock 73. After the adjustment, rotate the outer cylinder 1 to drive the side frame 72 to rotate on the tail stock 73, so that the outer cylinder 1 is vertically located above the wellhead, and then move the side frame 72 downward on the guide rail 71 so that the outer cylinder 1 covers the wellhead, thereby playing a role in positioning the outer cylinder 1 and facilitating rapid installation.

[0025] The above description is only an example of the implementation of the present invention and is not intended to limit the present invention. Any equivalent replacement made within the principle of the present invention shall be included in the protection scope of the present invention. The contents not elaborated in the present invention belong to the existing technology known to the technicians in this professional field.

Claims

1. A blowout prevention device for a petroleum gas well, characterized by: The invention comprises an outer cylinder (1), a middle column plate (2), a spring (3), a side arm (4), a folding arm (40), a hollow cylinder (5), a clamping block (50) and a well-locking mechanism (6). The middle part of the outer cylinder (1) is slidably connected to the middle column plate (2), a spring (3) is connected between the middle column plate (2) and the outer cylinder (1), the upper sides of the front and rear parts of the middle column plate (2) are both connected to the side arms (4), the upper parts of the side arms (4) are both rotatably connected to the folding arms (40), the folding arms (40) are both engaged with the outer cylinder (1), a torsion spring is connected between the folding arms (40) and the connected side arms (4), at this time, the torsion spring is in a deformed state, the lower side of the middle column plate (2) is connected to the hollow cylinder (5), a plurality of clamping blocks (50) are slidably connected to the hollow cylinder (5), and the outer cylinder (1) is provided with a well-locking mechanism (6) that can be fixed at the wellhead of a petroleum gas well.

2. A blowout prevention device for a petroleum gas wellhead as claimed in claim 1, characterized in that: The blocks (50) are all wedge-shaped blocks.

3. A blowout prevention device for a petroleum gas wellhead as claimed in claim 1, characterized in that: The well clamping mechanism (6) comprises an outer sleeve (61), a screw rod (62), a limiting ring (63), an elastic seat (64) and an angled clamping ring (65). The outer side of the outer cylinder (1) is connected to a plurality of outer sleeves (61), the screw rods (62) are all threadedly connected to the outer sleeves (61), the lower part of the outer sleeves (61) is slidably connected to the limiting ring (63), the screw rods (62) are all rotatably connected to the limiting ring (63), the lower part of the outer cylinder (1) is connected to a plurality of elastic seats (64), the elastic seats (64) are all in contact with the limiting ring (63), and the lower side of the elastic seats (64) is connected to the angled clamping ring (65).

4. A blowout prevention device for a petroleum gas wellhead as claimed in claim 3, characterized in that: The upper side of the screw rod (62) is provided with a handle.

5. A blowout prevention device for a petroleum gas wellhead as claimed in claim 3, characterized in that: The beveled clamping ring (65) is made of elastic material.

6. A blowout prevention device for a petroleum gas wellhead as claimed in claim 3, characterized in that: The outer tube (1) further comprises a positioning mechanism (7), the positioning mechanism (7) comprising a guide rail (71), a side frame (72), a tailstock (73) and a pitch adjusting rod (74), the front and rear sides of the outer tube (1) are both connected to the guide rails (71), the side frames (72) are both slidably connected to the guide rails (71), the side frames (72) are rotatably connected to the tailstock (73), and the front and rear parts of the tailstock (73) are both threadedly connected to the pitch adjusting rod (74).

Images