Shearing flashboard based on self-compensation sealing

Abstract

The utility model belongs to the field of well drilling construction, and particularly discloses a shear flashboard based on self-compensation sealing, which comprises a first flashboard and a second flashboard, the first flashboard and the second flashboard respectively comprise a first shear surface and a second shear surface, a sealing element is mounted in a mounting groove on the first shear surface, and the sealing element comprises a mounting part and an elastic part. The first end of the elastic part is connected to the mounting part, and the second end extends out of the mounting groove; the extending direction of the second end and the moving direction of the second flashboard form an acute angle, and the second end of the elastic part is of a floating structure made of elastic materials, so that when the flashboards are sheared, the elastic part is pressed to the first flashboard by the second flashboard, and the possibility that the elastic part and the second flashboard are damaged can be reduced; the extending direction of the second end and the flow direction of the pressure medium form an obtuse angle, the pressure medium flows to the side, away from the second gate plate, of the elastic part, the elastic part is pressed on the second gate plate, and the sealing performance is improved.

Description

Technical Field

[0001] This utility model belongs to the field of drilling construction, and in particular relates to a shear gate based on self-compensating seal. Background Technology

[0002] In oil and gas drilling operations, in order to safely drill through high-pressure oil and gas layers and avoid well blowout accidents that could disrupt normal drilling operations, damage oil and gas resources, and ensure the safety of drilling personnel and oil and gas wells, a blowout preventer needs to be installed at the wellhead.

[0003] The main purpose of shear gates is to effectively cut the drill pipe in the event of a blowout during drilling, well workover, or oil testing, thereby achieving an effective seal to prevent blowout accidents and ensure the safety of personnel and equipment. A sealing element is installed between the two shear gates to achieve a seal between the two gates.

[0004] Existing shear gates have poor sealing performance in actual use and are prone to leakage. Furthermore, during the shearing process of the gate on the drill pipe, the blade seal is often damaged by the shearing blade, leading to seal failure. Utility Model Content

[0005] To address the aforementioned technical problems, the utility model provides a shear gate based on a self-compensating seal, comprising:

[0006] The first gate includes a first shearing surface, on which a mounting groove extending radially along the first gate is formed.

[0007] The second gate includes a second shearing surface, which is used to cooperate with the first shearing surface of the first gate to perform shearing.

[0008] A sealing element, comprising a mounting portion and an elastic portion, wherein the mounting portion is installed in the mounting groove, a first end of the elastic portion is connected to the mounting portion, and a second end of the elastic portion extends out of the mounting groove along a first direction; the first direction is between a second direction and a third direction, wherein the second direction is the direction of movement of the second gate during shearing, and the third direction is the opposite direction of the pressure medium flowing outside the gate.

[0009] Preferably, the extension direction of the mounting groove is perpendicular to the second direction.

[0010] Preferably, the mounting groove penetrates the first shear surface and extends to both sides of the first gate.

[0011] Preferably, the mounting portion includes a receiving cavity for accommodating the elastic portion.

[0012] Preferably, at least two mounting slots are provided on the first gate plate, and the mounting slots extend in the same direction, and the sealing element is installed in each mounting slot.

[0013] Preferably, the mounting portion and the elastic portion are integrally formed using an elastic material.

[0014] Preferably, the mounting part and the mounting groove are fixedly connected by an interference fit.

[0015] Preferably, the mounting slot is provided with a locking position, and the mounting part is provided with a locking part that matches the locking position.

[0016] Preferably, at least two locking positions are provided in the mounting groove, and the locking positions are provided on the side wall of the mounting groove perpendicular to the second direction.

[0017] By applying the technical solution provided by this utility model, an installation groove is opened on the first shearing surface, and a sealing element is provided in the installation groove. The sealing element includes an installation part and an elastic part. The elastic part is made of elastic material. The first end of the elastic part is connected to the installation part, and the second end of the elastic part extends to the outside of the installation groove along the first direction. When the first gate and the second gate move towards each other to perform a shearing action, the extension direction of the second end of the elastic part forms an acute angle with the movement direction of the second gate. Moreover, the second end of the elastic part is a floating structure made of elastic material. Therefore, the second end of the elastic part will not be sheared by the second gate, but will be pressed against the first gate by the second gate. This can reduce the possibility that the part of the elastic part extending to the outside of the installation groove will be damaged by the second gate. After the first gate and the second gate move to their positions, the gate closes the wellhead. When the pressure medium in the well flows between the gates, the extension direction of the second end forms an obtuse angle with the flow direction of the pressure medium, and the end of the second end is compressed by the second gate. This allows the pressure medium to enter the side of the second end of the elastic part away from the second gate, thereby pressing the elastic part tightly onto the second gate and improving the sealing performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a shear gate based on self-compensating sealing in the initial state according to an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the first direction, the second direction, and the third direction in a self-compensating seal-based shear gate provided in an embodiment of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of a self-compensating seal-based shear gate in the closed state according to an embodiment of the present invention;

[0021] Figure 4This is a schematic diagram of the installation of the first gate and the sealing element in a self-compensating seal-based shear gate according to an embodiment of the present invention;

[0022] Figure 5a and Figure 5b This is a schematic diagram of the structure of the sealing element of a shear gate based on self-compensating sealing provided in an embodiment of the present invention;

[0023] Wherein: 1. First gate; 11. First shearing surface; 12. Mounting groove; 121. Locking position; 2. Second gate; 21. Second shearing surface; 3. Sealing element; 31. Mounting part; 311. Receiving cavity; 312. Locking part; 32. Elastic part. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] Figure 1 This is a schematic diagram of the structure of a shear gate based on self-compensating sealing in the initial state according to an embodiment of the present invention; Figure 2 A schematic diagram of the first direction, the second direction, and the third direction in a self-compensating seal-based shear gate provided in an embodiment of this utility model; Figure 3 This is a schematic diagram of the structure of a self-compensating seal-based shear gate in the closed state according to an embodiment of the present invention.

[0026] like Figures 1 to 3 As shown, this utility model provides a shear gate based on self-compensating sealing, including a first gate 1 and a second gate 2. The first gate 1 and the second gate 2 are respectively provided with a first shearing surface 11 and a second shearing surface 21, which can approach each other and perform shearing action to cut the drill rod. An installation groove 12 extending radially along the first gate 1 is provided on the first shearing surface 11.

[0027] A sealing element 3 is installed in the mounting groove 12. The sealing element 3 includes a mounting part 31 and / or an elastic part 32. The elastic part 32 is made of elastic material. The mounting part 31 is installed and fixed in the mounting groove 12. The first end of the elastic part 32 is connected to the mounting part 31. The second end of the elastic part 32 extends to the outside of the mounting groove 12 along a first direction. The first direction is between the second direction and a third direction. The second direction is the direction of movement of the second gate 2 when the gate is shearing. The third direction is the opposite direction of the pressure medium flowing outside the gate.

[0028] by Figure 2 For example, Figure 2 The second gate 2 moves to the left during the shearing action, so the second direction is from right to left. The pressure medium outside the gate flows upward, so the third direction is from top to bottom. The first direction is between the second direction and the third direction, which is the direction towards the lower left.

[0029] Since the elastic part 32 extends to the lower left, the second gate 2 moves to the left when the shearing action is performed. The extension direction of the second end of the elastic part 32 forms an acute angle with the movement direction of the second gate 2. Moreover, the second end of the elastic part 32 is a floating structure made of elastic material. Therefore, the second end of the elastic part 32 will not be sheared by the second gate, but will be pressed against the first gate 1 by the second gate 2. This can prevent the part of the elastic part 32 extending outside the mounting groove 12 from being damaged by the second gate 2.

[0030] Furthermore, after the first gate 1 and the second gate 2 have moved into position, the gates close the wellhead. When the pressure medium in the well flows between the gates, the extension direction of the second end of the elastic part 32 forms an obtuse angle with the rightward flow direction of the pressure medium, and the end of the second end is compressed by the second gate 2, so that the pressure medium enters the side of the second end of the elastic part away from the second gate 2, thereby pressing the elastic part onto the second gate 2, which can improve the sealing performance.

[0031] by Figure 1 and Figure 3 For example, after the gate seals the wellhead, the pressure medium inside the well flows between the gates. Figure 3 The pressure medium flows upward and to the right through the gap between the first gate 1 and the second gate 2. The pressure medium flowing to the right enters the inverted "U"-shaped groove formed by the second end of the elastic part 32 and the mounting part 31. This causes the second end of the elastic part 32, which is in contact with the surface of the second shear surface 21, to be subjected to downward pressure from the pressure medium. This allows the second end to adhere tightly to the surface of the second shear surface 21, preventing the pressure medium from flowing between the elastic part 32 and the second shear surface 21. The greater the pressure of the pressure medium, the tighter the fit between the elastic part 32 and the second shear surface 21 becomes, thereby achieving a self-compensating seal.

[0032] The elastic part 32 can be made of nitrile rubber, fluororubber, etc., and the material can be selected according to the actual working environment to meet the properties of elasticity, wear resistance and corrosion resistance.

[0033] In one preferred embodiment, the extending direction of the mounting groove 12 is perpendicular to the second direction, so as to Figure 3For example, the second direction is the direction of movement of the second gate 2 during shearing, that is, from right to left. Therefore, the extension direction of the mounting groove 12 is perpendicular to the paper and extends inward and outward. This makes the direction of movement of the second gate 2 perpendicular to the extension direction of the seal 3 in the mounting groove 12 when the gate performs the shearing action. This allows the elastic part 32 to be uniformly squeezed by the second shearing surface 21, reducing the possibility of the elastic part 32 being damaged by the second shearing surface 21.

[0034] In one preferred embodiment, the mounting groove 12 penetrates the first shear surface 11 and extends to both sides of the first gate 1, so that the seal 3 divides the space between the entire first shear surface 11 and the second shear surface 21 into two parts, making it easier to use with other seals installed on the sides of the first gate 1 and the second gate 2, thereby enabling the first gate 1 and the second gate 2 to provide a more comprehensive seal for the wellhead.

[0035] In addition, the mounting groove 12 can also be configured in other ways, as long as it can satisfy the installation of the seal 3, and the second end of the elastic part 32 can extend in a specified direction. At the same time, the configuration of the elastic part 32 can reduce the probability of it being sheared and damaged by the second gate 2, and improve the sealing performance between the first shear plate 1 and the second shear plate 2. The matching method of the mounting groove 12 and the seal 3 provided in this embodiment can be used alone between two gates, or it can be used in conjunction with other sealing structures. No specific limitation is made here.

[0036] Figure 5a and Figure 5b This is a schematic diagram of the sealing element of a shear gate based on self-compensating sealing provided in an embodiment of the present invention.

[0037] like Figure 5a and Figure 5b As shown, a receiving cavity 311 for accommodating the elastic part 32 is provided on the mounting part 31. When the gate performs a shearing action, the second gate 2 moves along the second direction, and the second shearing surface 21 exerts a squeezing force on the second end of the elastic part 32. By providing the receiving cavity 311, the elastic part 32 can be pressed into the receiving cavity 311 when subjected to squeezing force, and there is a certain deformation space, which further reduces the possibility of the elastic part 32 being damaged by the second shearing surface 21.

[0038] In one preferred embodiment, at least two mounting grooves 12 are provided on the first shear surface 11 of the first gate plate 1, and each mounting groove 12 extends in the same direction. Each mounting groove 12 is equipped with a seal 3. By providing multiple mounting grooves 12 and seals 3 between the first shear surface 11 and the second shear surface 21, the sealing performance between the first shear surface 11 and the second shear surface 21 can be further improved. Furthermore, even if one of the seals 3 is damaged during closing, the sealing performance between the first shear surface 11 and the second shear surface 21 can be guaranteed by the other seals 3.

[0039] In one preferred embodiment, the mounting portion 31 and the elastic portion 32 are integrally formed from an elastic material. In this case, the mounting portion 31 can be installed in the mounting groove 12 using an interference fit. That is, the outer contour of the mounting portion 31 is slightly larger than the inner wall contour of the mounting groove 12. The mounting portion 31 is installed in the mounting groove 12 by applying pressure, thus achieving fixed installation of the seal 3 within the mounting groove 12. When the gate plate performs a shearing action, the second gate plate 2 moves along the second direction, and the second shearing surface 21 exerts a compressive force on the second end of the elastic portion 32. Since the seal 3 is made entirely of an elastic material, the elastic portion 32 has a larger compressibility margin, reducing the possibility of damage to the elastic portion 32 from the second shearing surface 21.

[0040] Figure 4 This is a schematic diagram of the installation of the first gate and the sealing element in a self-compensating seal-based shear gate according to an embodiment of the present invention.

[0041] like Figure 4 As shown, in one preferred embodiment, a locking slot 121 is provided in the mounting groove 12, and a locking portion 312 matching the locking slot 121 is provided on the mounting part 31. When the mounting groove 12 and the mounting part 31 are installed with an interference fit, the mounting part 31 can be compressed, and force can be applied to lock the locking portion 312 into the locking slot 121, thereby improving the stability of the seal 3 installed in the mounting groove 12. Furthermore, as... Figure 4 As shown, two sets of locking positions 121 are provided in the mounting groove, and the two sets of locking positions 121 are located on the two side walls of the mounting groove 12 perpendicular to the second direction. Figure 4 The locking position 121 is set on the left and right inner walls of the mounting groove 12, which can further improve the stability of the seal 3 in the mounting groove 12.

[0042] Furthermore, if the mounting groove 12 is provided to penetrate the first shear surface 11 and extend to both sides of the first gate plate 1, the size of the opening of the mounting groove 12 on the first shear surface 11 can be further set to be smaller than the size of the corresponding part on the seal 3. In this case, the seal 3 can be installed into the mounting groove 12 from both sides of the first gate plate 1. After installation, it can be ensured that the seal 3 will not fall off from the opening of the mounting groove 12 on the first shear surface 11, thereby improving the stability of the seal 3 installation.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to the embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solution of this utility model do not depart from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered by the claims of this utility model.

Claims

1. A shear gate based on self-compensating sealing, characterized in that, include: The first gate includes a first shearing surface, on which a mounting groove extending radially along the first gate is formed. The second gate includes a second shearing surface, which is used to cooperate with the first shearing surface of the first gate to perform shearing. A sealing element, comprising a mounting portion and an elastic portion, wherein the mounting portion is installed within the mounting groove, and a first end of the elastic portion is connected to the mounting portion. The second end of the elastic portion extends along the first direction to the outside of the mounting groove; The first direction is between the second direction and the third direction, wherein the second direction is the direction of movement of the second gate during shearing, and the third direction is the opposite direction of the pressure medium flowing outside the gate.

2. The self-compensating sealing shear gate according to claim 1, characterized in that, The extension direction of the mounting groove is perpendicular to the second direction.

3. The self-compensating sealing shear gate according to claim 2, characterized in that, The mounting groove penetrates the first shear surface and extends to both sides of the first gate.

4. The self-compensating sealing shear gate according to claim 1, characterized in that, The mounting portion includes a receiving cavity for accommodating the elastic portion.

5. The self-compensating sealing shear gate according to claim 1, characterized in that, At least two mounting slots are provided on the first gate plate, and the mounting slots extend in the same direction. The sealing element is installed in each mounting slot.

6. The self-compensating sealing shear gate according to claim 1, characterized in that, The mounting part and the elastic part are integrally formed using an elastic material.

7. The self-compensating sealing shear gate according to claim 6, characterized in that, The mounting part and the mounting groove are fixedly connected by an interference fit.

8. The self-compensating sealing shear gate according to claim 7, characterized in that, The mounting slot is provided with a locking position, and the mounting part is provided with a locking part that matches the locking position.

9. The self-compensating sealing shear gate according to claim 8, characterized in that, The locking positions are provided in at least two locations within the mounting groove, and the locking positions are located on the side wall of the mounting groove perpendicular to the second direction.

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