CN114320221A

CN114320221A - Bridge plug assembly

Info

Publication number: CN114320221A
Application number: CN202110953385.3A
Authority: CN
Inventors: 汤米埃里克森
Original assignee: Antimony Sail Co ltd
Current assignee: Antimony Sail Co ltd
Priority date: 2021-08-19
Filing date: 2021-08-19
Publication date: 2022-04-12

Abstract

The application discloses a bridge plug assembly, which comprises a shell, a safety diaphragm, a diaphragm seat, a shearing ring and a crushing piece, wherein the safety diaphragm, the diaphragm seat, the shearing ring and the crushing piece are positioned in the shell, the crushing piece comprises a body and an extension part, the extension part is provided with a crushing surface, the crushing piece is provided with a first position and a second position, the crushing surface is far away from a supporting surface when the crushing surface is in the first position, and the shearing ring and the safety diaphragm are in an integral state; in the second position, the crushing surface abuts against the support surface, the shear ring and the rupture disk are in an incomplete state, the shear ring is broken, and the rupture disk is axially displaced and crushed by the crushing member. The bridge plug assembly in the application is simple in design, relatively few in parts, few in moving parts and capable of reducing the risk of opening the bridge plug to the maximum extent.

Description

Bridge plug assembly

Technical Field

The application relates to the technical field of oil wells, in particular to a bridge plug assembly.

Background

Bridge plug assemblies (also known as floating collars) have many uses in the drilling, testing, completion, hydraulic fracturing, production and abandonment of oil and gas wells to form a fluid barrier in the well. Some applications are non-permanent, such as the use of bridge plugs in abandoned wells, primarily for temporary plugging, requiring fluid flow to be restored at a later time. Examples of such temporary uses are flotation, completion testing, packer setting, and fluid loss equipment.

The use of flotation in the horizontal part of the well when casing or screen is run into the well reduces the friction in the well. An air chamber is then formed in the conduit between the mechanical valve or bridge plug assembly at the bottom (toe) of the casing and the bridge plug assembly (heel) mounted closer to the ground. This allows the horizontal section of casing or screen to "float" into place, after which the bridge plug assembly must be cleared or opened and the valve opened in preparation for subsequent operations (e.g., cementing, pressure testing, and production). After completion, the integrity of the casing and production tubing is tested to ensure that oil and gas production does not leak out under different conditions. By installing the bridge plug assembly, the well sections can be isolated and tested separately, and finally the bridge plug assembly must be opened or cleared prior to production. When the set packer seals the annulus between the production tubing and the casing, the bridge plug assembly can also act as a barrier in the production tubing, can apply pressure to the production tubing, and must be opened or cleaned before final production. The bridge plug assembly of the present invention is suitable for the above-described uses, but these are merely examples of use and are not a limiting list, and the bridge plug assembly may also be used in other downhole applications.

There are many types of bridge plug assemblies known in the art that can be cleared or deactivated/opened. For example, coiled tubing or wireline may be used to pull the bridge plug assembly out of the well. But this can cause problems such as tubing damage and take up a significant amount of valuable drilling time. The bridge plug assembly may also be drilled or milled, but this has similar disadvantages. Such bridge plug assemblies are typically comprised of metal bridge plugs and are removed which often results in unwanted parts or debris in the well. The bridge plugs can also be made of a dissolvable material, but must be well defined for the conditions of use and dissolvable material, not allowing for variations in installation time. Other materials, such as rubber or composite bridge plugs, also have disadvantages and are very sensitive to high temperatures and pressures downhole, and harsh chemical environments. Brittle materials such as glass or ceramics have the advantage of being relatively insensitive to pressure, temperature and chemical attack, but due to their brittle nature, they are relatively easily damaged when used as the fluid blocking portion of a bridge plug assembly. Especially glass, can be broken into very small fragments without causing other problems in most wells. The frangible material can be broken in a number of ways to open the bridge plug assembly, such as by making the bridge plug assembly from a small amount of explosive that can crush a rupture disc made of a glass disc to open the bridge plug assembly without damaging the production tubing or casing. However, when using explosives there is always a risk that the explosive or parts thereof are not detonated and the transportation and operation of installing a bridge plug assembly containing explosives is quite complicated, since many safety issues have to be taken into account. It is therefore optimal to be able to break a glass rupture disc in a bridge plug assembly without the use of explosives.

Typically, opening a bridge plug assembly will rupture the rupture disc, which is mounted within the housing of the bridge plug assembly, typically as part of the bridge plug assembly or simultaneously with the bridge plug assembly. The simplest method of breaking the safety diaphragm may be to apply pressure directly to it with a breaker, which allows a simple mechanical solution to be used. The area of the disruptor in contact with the diaphragm support surface is relatively small. Brittle materials such as glass and ceramics can withstand high pressures in oil and gas wells, but if a very small area is exposed it will shatter, which is an advantage of high pressure fracture. The breaker may be a thin edge tool such as a blade, or a small tool such as a pin, or even a small ball or other rounded structure, requiring only a very small portion to contact the rupture disc. Its shape is not critical and it is important that the contact area between the breaker and the diaphragm support surface is small so that the rupture of the rupture disc can be achieved with a relatively small force applied relatively quickly. The rupture disk may also be weakened at the point of contact during its construction, making it more susceptible to crushing. Also relative movement is required, i.e. the breaker must move relative to the safety diaphragm. By either the rupture disc or the shredder moving to the other, depending on which rupture disc shredding system is used. To achieve this goal, a variety of crushing systems may be employed including the use of electronic signals, hydraulic oil and pressure. Since the pressure applied to the bridge plug assembly and the rupture disk can be controlled directly from the surface, the rupture disk can be broken directly using the pressure. This is an efficient and simple solution as it does not require any type of signal to be sent from the surface to the bridge plug assembly, but only pressure from the wellhead and then mechanically driving the breaker to move to the diaphragm support surface. The details of how this drive takes place differ from known crushing systems.

In designing such a system, consideration should be given to 1) the desire to use as few components as possible, and in particular as few moving components as possible, to reduce the risk of the components breaking or jamming during operation, and to be easy to manufacture; 2) to avoid accidental actuation, i.e. accidental or premature breaking of the rupture disc, the system preferably includes safety measures to prevent this from occurring; 3) the safety diaphragm must be installed to ensure its safety and not easily burst when downhole pressure fluctuates (i.e., direct pressure rather than impact of the breaker); 4) the rupture disk is secured in such a manner that it forms a fluid-tight barrier in the pipe when installed, until it ruptures; 5) the rupture disc is preferably broken into small enough pieces to avoid potential downhole hazards; 6) the bridge packings should not have the possibility of being partially opened, i.e., the system preferably only allows the rupture disc to be fully intact or to be fully ruptured, rather than to be partially ruptured. If the part breaks, the bridge plug will not be able to be pressurized, so it is not possible to open it completely from above, so other methods must be used to open it completely; 7) the inside diameter of the tubing (or casing) in which the bridge plug assembly is installed is preferably fully recovered after the bridge plug assembly is opened, i.e., the inside diameter of the bridge plug assembly should not be less than the inside diameter below and above the bridge plug assembly. This allows unrestricted fluid flow through the open bridge plug assembly.

Disclosure of Invention

It is an object of the present application to provide a bridge plug assembly that includes a rupture disc that can be held under pressure, is safe, can be fully opened by a rupture mechanism, and is sufficiently rigid and capable of breaking the rupture disc using a rupture member in a controlled and predictable manner. In designing a bridge plug assembly, the rupture disk should be caused to rupture at a certain preset pressure value applied above the bridge plug assembly. This preset value should be predictable and repeatable. The parts of the bridge plug assembly are as few as possible, and different opening pressure values of the safety diaphragm can be met.

The technical scheme adopted by the application is as follows:

a bridge plug assembly comprising a housing, further comprising, located inside the housing:

a rupture disc having a support surface;

a diaphragm seat including a seat body formed with a crushing member accommodating chamber, the seat body supporting a safety diaphragm;

the shearing ring supports the membrane seat, and a membrane seat accommodating space is arranged below the shearing ring;

a crushing member including a crushing member body provided with an extension portion extending toward the safety diaphragm, the extension portion having a crushing surface, the shear ring being disposed between the crushing member and the housing, the bridge plug assembly having a first position and a second position;

in the first position, the crushing surface is remote from the support surface, and the shear ring and the rupture disc are both in an intact condition;

in the second position, the crushing surface abuts the support surface and the shear ring and the rupture disk become non-integral, wherein the diaphragm seat is moved axially downward by the pressure of the rupture disk when a predetermined pressure threshold is applied to the top of the rupture disk, the predetermined pressure threshold is derived from the absolute pressure applied to the top of the rupture disk or the predetermined pressure difference experienced by the rupture disk, the pressure difference is the difference between the force applied to the top of the rupture disk on the wellhead side and the force applied to the bottom of the rupture disk on the bottomhole side, and the force experienced by one side of the rupture disk is directly related to the pressure. In practice, either an absolute pressure or a preset pressure differential will be achieved by applying pressure on top of the rupture disc. The diaphragm seat transmits pressure to the shearing ring, the shearing ring is sheared by force and partially enters the diaphragm seat accommodating space, the crushing piece partially enters the crushing piece accommodating cavity, and the crushing surface penetrates through the crushing piece accommodating cavity to abut against the supporting surface to crush the safety diaphragm.

In some embodiments, the crushing members are supported by the shear ring.

In some embodiments, the crushing member further comprises a crushing body disposed on the crushing member body, a top surface of the crushing body forming the crushing surface. Further, the crushing body has a pointed structure or an elongated body structure. Designing the crushing body with the crushing surface separately has the advantageous effect that parts of the crushing surface can be designed of a different material than the rest of the crushing member or can be added to the rest of the crushing member if it is easier to fine-manufacture as one small part. The crushing surface may hit the rupture disc at an action point at a lower speed, and therefore the crushing surface cannot be a duller surface. The preferred embodiment of the crushing body is an elongated body, since this arrangement will hit the safety diaphragm more efficiently than a shorter crushing body, ensuring crushing.

In some embodiments, the shear ring includes a ring body and a ring lug disposed on the ring body, the ring lug being separable from the ring body at a shear line of the ring body. By using loop lugs rather than just solid shear loops, the pressure required to shear the loop can be adjusted by adjusting the number of shared lugs on the shear line, and this change in pressure can also be adjusted by the number and/or size of the loop lugs. In some embodiments, the ring lugs are located inside the ring body, and the shear ring includes a plurality of ring lugs that are evenly spaced inside the ring body. The lugs are evenly spaced around their perimeter so that the pressure of the rupture disc is evenly distributed over the shear lugs, ensuring that they are all sheared evenly. For ease of manufacture, it is preferred that the shear ring lugs have the same thickness as the shear ring body. The loop lugs may of course also be thinner than the shear loop body so that they are easier to shear. The shear ring is the only variable of the bridge plug assembly, other accessories of the bridge plug assembly do not need to be changed, and the size and/or the number of the shear ring support lugs are determined according to different opening pressures of the bridge plug assembly.

In some embodiments, the crushing member has a plurality of extensions, the number of extensions being three. While one crushing surface will be sufficient to break the rupture disc, the use of three crushing surfaces makes it easier for the system to remain balanced, and the rupture disc will not be distorted in some way (i.e. not only move axially, but also radially). Three breakers are the minimum number to ensure this, although more is possible, but not strictly necessary, and an excessive number increases the complexity of the structure.

In some embodiments, the crushing body is angled less than 45 ° from the housing.

In some embodiments, the safety diaphragm further comprises a diaphragm seal disposed between the safety diaphragm and the housing, the diaphragm seal being in sealing engagement with both the safety diaphragm and the housing in the first position and/or the second position. Further, the diaphragm seal is an annular sealing ring. In order for the bridge plug assembly to function properly in the closed condition, the bridge plug assembly must be fluid tight so that there is no liquid leakage. It is possible to add a seal between the rupture disc and the housing but to ensure that the seal is in contact with both locations rather than one of them. If the rupture disc is accidentally stopped before rupturing after the bridge plug assembly is activated, as the rupture disc moves from the first position to the second position, the disc seal is important because the disc seal is still sealed and can be re-pressurized to rupture the rupture disc. However, if the diaphragm seal fails to maintain a seal, it will fail to stabilize the pressure and the rupture disc will not move to the rupture member to effect rupture.

In some embodiments, the safety diaphragm is formed from one or more layers of glass. Glass is not significantly altered or damaged by corrosive conditions or high temperatures within the wellbore, and has the advantage of being able to break into very small fragments. Different types of glass can be selected according to the design requirements of the bridge plug, and the glass has different strength and thickness and can bear the pressure difference of the bridge plug assembly. In some cases, for example when very strong and/or thick glass is desired, it may be desirable to use two or more layers of glass. It is not feasible to produce very thick glass that is particularly hard, and several layers of thinner glass may be stronger than one layer of thicker glass. The glass of the bridge plug assemblies described herein may be used with glass packages made of a single glass or multiple glass stacks. The glass layers may be stacked directly together or a thin film of cushioning material may be interposed to ensure that the forces are adequately distributed in the event that the surface of the rupture disc is not sufficiently flat.

Due to the adoption of the technical scheme, the beneficial effects obtained by the application are as follows:

the bridge plug assembly in the application is simple in design, relatively few in parts, few in moving parts and capable of reducing the risk of opening the bridge plug to the maximum extent. The shear ring can be conveniently adjusted to the required shear pressure, for example, the type of material, thickness, or number of shear plates, and the shear value can be predictable and repeatable. Therefore, the bridge plug can be opened at the set value only by setting the structure of the shearing ring. When the shear ring is broken, the rupture disc will move axially to be broken by the breaker. Since the crushing member is supported from below upwards, it can withstand high loads without breaking or breaking. Especially when the glass is thick or multiple layers of glass are to be broken, the bridge plug can be firmer, and the glass can be conveniently broken to keep the integrity of the broken piece.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

FIG. 1 discloses a schematic structural diagram of a bridge plug assembly in an oil pipe in example 1.

FIG. 2 discloses a schematic structural view of the bridge plug assembly in a first position of example 1.

FIG. 3 discloses a schematic structural view of the bridge plug assembly in a second position of example 1.

FIG. 4 discloses a schematic view of the bridge plug assembly in an oil pipe at another position in example 1.

Fig. 5 discloses a schematic structural view of the membrane holder and the shear ring in example 1.

Fig. 6 discloses a schematic view of a shear ring according to example 1.

Fig. 7 discloses another schematic construction of the shear ring of example 1.

Fig. 8 discloses a schematic structural view of a shear ring having a plurality of ring lugs in embodiment 1.

Fig. 9-12 disclose schematic structural diagrams during operation of the bridge plug assembly in embodiment 1.

FIG. 13 discloses a schematic diagram of the construction of a bridge plug assembly in an oil tube in example 2.

FIG. 14 discloses a schematic structural view of the bridge plug assembly in the first position of example 2.

FIG. 15 discloses a schematic structural view of the bridge plug assembly in the second position of example 2.

Fig. 16 discloses a schematic structural view of the membrane holder and shear ring of example 2.

FIGS. 17 to 20 are schematic structural diagrams in the operation process of the bridge plug assembly in embodiment 2

Wherein,

100: a bridge plug assembly;

1: a rupture disk;

11: a diaphragm seal;

12: a support surface;

2: a membrane seat;

21: a base body;

22: crushing member accommodating cavity

3: a crushing member;

31: a crushing member body;

32: an extension portion;

33: a crushing body;

331: crushing the dough;

34: a membrane seat accommodating space;

4: a shear ring;

41: a ring body;

42: cutting a line;

43: a loop lug;

5: a housing;

51: an upper housing;

511: an upper housing groove;

52: a lower housing;

521: a lower housing groove;

6: a partial tubular string;

61: putting a pipe column;

62: and (5) running the tubular column.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like are used in the positional or orientational relationship shown in the drawings for the purpose of convenience and simplicity of description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present invention.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Example 1

The application provides a bridge plug assembly, including casing 5, still including being located inside of casing 5:

a rupture disc 1 having a support surface 12;

a diaphragm seat 2 supporting the rupture disc 1, the diaphragm seat 2 including a seat body 21, the seat body 21 being formed with a crushing member accommodating chamber 22;

a shear ring 4 supporting the membrane holder 2;

a crushing member 3 including a crushing member body 31, an upper end of the crushing member body 31 being formed with an extension portion 32 extending toward the safety diaphragm 1, the extension portion 32 having a crushing surface 331, a diaphragm seat accommodating space 34 being formed between a portion of the crushing member body 31 and the housing 5, the shear ring 4 being disposed between the crushing member 3 and the diaphragm seat 2, the crushing member 3 having a first position and a second position;

in the first position, the crushing surface 331 is remote from the support surface 12, and the shear ring 4 and the rupture disc 1 are both in an intact condition;

in the second position, the crushing surface 331 abuts against the support surface 12, the shear ring 4 and the safety diaphragm 1 are in an incomplete state, wherein the diaphragm seat 2 is moved axially downward by the pressure of the safety diaphragm 1, the shear ring 4 is sheared by the force and partially enters the diaphragm seat accommodating space 34, the crushing member 3 partially enters the crushing member accommodating chamber 22, and the crushing surface 331 passes through the crushing member accommodating chamber 22 and abuts against the support surface 12 to crush the safety diaphragm 1.

Refer to fig. 1. FIG. 1 discloses a two-dimensional cross-sectional view of a bridge plug assembly in a section of a pipe string. The bridge plug assembly 100 includes a rupture disc 1 supported by a diaphragm seat 2. The valve seat is located on a shear ring 4. A portion of the shear ring is located on the crushing member 3. The bridge plug assembly 100 is disposed within the housing 5 of the partial tubular string 6. The column section is comprised of an upper tube 61 and a lower tube 62.

The shear ring 4 includes a ring body 41 and a ring lug 43, the ring lug 43 is provided on the ring body 41, and the ring lug 43 is separable from the ring body 41 at a shear line 42 of the ring body 41.

The rupture disc 1 is formed of one or more layers of glass that prevent flow inside the upper and

lower tubes

61, 62. After the rupture disk 1 is broken, the liquid may flow through the upper tube 61 and the lower tube 62. Fig. 1 shows the system in a first position, in which fluid is prevented.

The safety diaphragm 1 shown in fig. 1 is chamfered at both the top and bottom. However, this is only one example of the rupture disc 1. The rupture disc 1 may also be free of chamfers on the top and/or bottom surfaces. Further, the number of the safety diaphragms 1 may be set to 1 (as shown in fig. 1) or may be set to plural. Preferably, the diameter of the safety diaphragm 1 shown in the figures is greater than the internal diameter of a section of the partial tubular string 6. The rupture disc 1 now allows the entire internal bore to be restored after rupture of the rupture disc 1.

The diaphragm seat 2 supports the safety diaphragm 1. It is noted that the diaphragm seat 2 may support the safety diaphragm 1, and may also indirectly support the safety diaphragm 1, when the diaphragm seat 2 indirectly supports the safety diaphragm 1, that is, the diaphragm seat 2 supports other accessories to further support the safety diaphragm 1.

As for the crushing member 3, further, the crushing member 3 further includes a crushing body 33 provided above the extension portion 32, and a top surface of the crushing body 33 forms the crushing surface 331. When the rupture disk 1 contacts the rupture disk 3, the rupture disk 1 is ruptured.

The crushing member 3 has a plurality of extensions 32, the number of said extensions 32 being three.

With respect to shear ring 4, when the force applied to rupture disk 1 exceeds a predetermined threshold, shear ring 4 will shear into two segments. The shear ring 4 may be divided into a plurality of segments depending on the position of the shear ring.

For the first and second positions, as shown in fig. 2 and 3. FIG. 2 discloses the bridge plug assembly in a first position. FIG. 3 discloses the bridge plug assembly in a second position.

As shown in fig. 2, the safety diaphragm 1 is supported by the diaphragm seat 2. The diaphragm seat 2 is composed of a seat body 21, and the seat body 21 provides required support for the rupture disk 1. The seat body 21 is also formed with a crushing member accommodating chamber 22. When the diaphragm seat 2 is moved downwardly, the bridge plug assembly 100 is moved from the first position to the second position, at which time the crushing body 33 is moved through the crushing member receiving cavity 22 of the diaphragm seat 2.

The seat 21 is located above a portion of the shear ring 4. A film seat receiving space 34 is formed below the shear ring 4, and the film seat receiving space 34 can allow the film seat 2, the shear ring 4 to partially move downward. When in the first position, the shear ring 4 provides support for the membrane holder 2. When in the second position, the shear ring 4 is sheared into two sections by external force, and the seat body 21 falls down with the ring body 41 into the diaphragm seat receiving space 34. The function of the diaphragm seat receiving space 34 is to provide space for the diaphragm seat 2 to move when the bridge plug assembly 100 is moved from the first position to the second position. It should be noted that the diaphragm seat receiving space 34 must be dimensioned so as to be able to move in order to bring the rupture disc 1 into contact with the rupture member 3.

The bridge plug assembly 100 of the present application is disposed in the housing 5 of a partial tubular string 6. The housing 5 is composed of an upper housing 51 and a lower housing 52. The upper housing 51 is disposed in the upper tube 61 and the lower housing 52 is disposed in the lower tube 62. The crushing member 3 is located at the upper part of the end of the lower tube 62. Fig. 4 illustrates an embodiment in which the lower housing 52 has a lower position.

The rupture disc 1 is mounted within the housing 5, more specifically in the housing upper housing groove 511. A diaphragm seal 11 is provided between the rupture disc 1 and the housing 5. In the first and/or second position, the diaphragm seal 11 is in sealing engagement with both the rupture disc 1 and the housing 5. The diaphragm seal 11 functions to prevent fluid from flowing through around the rupture disc 1. The diaphragm seal 11 is preferably an annular (O-ring) seal.

In a preferred embodiment, the rupture disc 1 resists fluid movement from the upper tube 61 to the lower tube 62 (i.e., is sealed) throughout the movement of the bridge plug assembly from the first position to the second position, thereby preventing fluid pulsation during operation, while also helping to reduce twisting or rotation of the rupture disc 1 during movement from the first position to the second position. The bottom surface of the rupture disc 1 is a support surface 12. The support surface 12 is part of the safety diaphragm 1 and is the first component to contact the crushing member 3.

The function of the breaker elements 3 is to break the rupture disc 1 when it enters the second position. The crushing member 3 comprises a crushing member body 31 supported by a portion of the housing 5. The extension 32 extends from the crushing member body 31 toward the safety diaphragm 1. The extension 32 is capable of holding and supporting the crushing body 33.

The crushing body 33 has a pointed structure or an elongated body structure.

In the illustration, the crushing body 33 is an elongated body, i.e. in the form of an elongated body. It should be noted that the crushing body 33 may be a pointed (pointed) end of the distal end of the extension 32. The crushing body 33 has a crushing surface 331 formed at its end. When the bridge plug assembly 100 is moved to the second position, the support surface 12 contacts the crushing surface 331 of the extension 32 (or crushing body 33), thereby crushing the rupture disk 1 into fragments and restoring the flow of liquid in a portion of the tubing string 6. The crushing body 33 may be provided in other shapes. For example, spiral or long nails are used as the crushing bodies 33.

Alternatively, it is also possible to crush the diaphragm 1 directly using the extension portion 32, that is, the tip of the extension portion 32 forms the crushing surface 331. The configuration of the end of the extension 32 may be adjusted accordingly so that it is easier to break the rupture disc 1. For example, the tip of extension 32 is sharpened, making the break surface 331 a sharp point.

Refer to fig. 4. Fig. 4 discloses an alternative position of the bridge plug assembly 100 in a portion of the tubular string 6. The partial pipe string includes an upper housing 51 and a lower housing 52. In this embodiment, the bridge plug assembly 100 is disposed within the housing 5. Unlike fig. 1-3, there is a lower case 52 in addition to the upper case 51 extending upward around the safety diaphragm 1. The diaphragm seat 2 is disposed in and supported by the lower housing groove 521. As previously mentioned, the membrane seat 2 is located above the shear ring 4, and the crushing member 3 supports the shear ring 4.

Refer to fig. 5. Fig. 5 discloses a detailed schematic view of the membrane holder 2 and the shear ring 4. The diaphragm seat 2 supports the rupture disk 1 through the seat body 21. The holder body 21 is supported by the ring body 41. The ring lugs 43 are located on the crushing members 3 (as shown). When the force applied to rupture disk 1 is above the shear ring threshold, it will be sheared along shear line 42 of shear ring 4. Thereby, the shear ring 4 is divided into two parts. The seat body 21 pushes the ring body 41 downward to move. The ring body 41 will enter the diaphragm seat receiving space 34 and continue to move downward until it contacts a portion of the bridge plug assembly 100, which does not move relative to the tubing string 6.

Refer to fig. 6. Fig. 6 shows a schematic view of the shear ring 4. As shown in fig. 6, the shear ring 4 is composed of a ring body 41 and a ring lug 43. When the external force exceeds the threshold of the shear ring 4, the two portions will be sheared at the shear line 42 of the shear ring 4.

Refer to fig. 7. Figure 7 shows an alternative shear ring 4. The shear ring in fig. 7 is provided with a ring lug 43 inside, and the ring lug 43 is located outside the ring body 41 in fig. 7. They are all cut apart at a cut line 42.

The ring lugs 43 have the same thickness as the ring body 41.

Although the ring leg 43 of the shear ring 4 is shown to be shorter than the ring body 41, this is not a limitation. The ring lugs 43 may be the same height as the ring body 41.

In fig. 6 and 7, the ring lugs 43 are attached to the bottom of the ring body 41. It may also be attached at the top, or somewhere in the middle.

The ring support lugs 43 are located inside the ring body 41, the shear ring 4 comprises a plurality of ring support lugs 43, and the ring support lugs 43 are uniformly arranged inside the ring body 41 at intervals.

Refer to fig. 8. Fig. 8 discloses an alternative shear ring 4 having a plurality of shear ring lugs 43. In this embodiment, a plurality of loop lugs 43 are distributed along the interior of the shear ring 4 to facilitate fine tuning of the threshold force of the shear ring 4 itself. The hoop lugs 43 will be sheared off the hoop body 41 at the shear line 42.

Refer to fig. 9-12. Fig. 9-12 show the bridge plug assembly 100 in operation. When the bridge plug assembly 100 is in the first position, as shown in FIG. 9, the rupture disc 1 is disposed within the housing 5 formed by the stem 6. The diaphragm seat 2 supports the safety diaphragm 1 with the support surface 12 at a distance from the crushing surface 331 of the crushing body 33, the diaphragm seat 2 being supported by the shear ring 4.

Fig. 10 discloses a schematic view of the bridge plug assembly 100 in a second position. When a threshold force is applied to the top of the rupture disc 1, the shear ring 4 is sheared into two pieces, the diaphragm seat 2 moves downwards and the rupture disc 1 also moves downwards. The support surface 12 is in turn brought into contact with the crushing surface 331 of the crushing body 33, causing the rupture of the rupture disk 1.

When the bridge plug 100 is in the second position, the force on the rupture disc 1 causes the fracture surface 331 on the fracture body 33 to move further into the rupture disc 1. Ensuring that the rupture disc 1 is broken. The rupture discs 1 are arranged in a plurality or spaced apart and stacked to achieve the rupture purpose, thereby achieving the flow of fluid in the pipe string 6, as shown in fig. 12.

The bridge plug assembly of the present invention is suitable for the above-described applications, but these are merely examples of use and are not intended to be limiting and may be used in other downhole applications.

Example 2

a rupture disc 1 having a support surface 12;

a shear ring 4 supporting the membrane holder 2, a membrane holder accommodating space 34 being provided at a lower portion of the shear ring 4;

a crushing member 3 including a crushing member body 31, an upper end of the crushing member body 31 being formed with an extension 32 facing the safety diaphragm 1, the extension having a crushing surface 331, the crushing member 3 having a first position and a second position;

in the second position, the crushing surface 331 abuts against the support surface 12, the shear ring 4 and the rupture disk 1 are in an incomplete state, the diaphragm seat 2 is moved axially downward by the pressure of the rupture disk 1, the shear ring 4 is sheared by the force, the crushing member body 31 of the crushing member 3 enters the crushing member accommodating chamber 22, and the crushing surface 331 passes through the crushing member accommodating chamber 22 and abuts against the support surface 12 to crush the rupture disk 1.

Refer to fig. 13. FIG. 13 discloses a two-dimensional cross-sectional view of a bridge plug assembly in a section of a pipe string. The bridge plug assembly 100 includes a rupture disc 1 supported by a diaphragm seat 2. The membrane holder 2 is located on a shear ring 4. A portion of the shear ring is also supported with the crushing members 3. The bridge plug assembly 100 is disposed within the housing 5 of the partial tubular string 6. The column section is comprised of an upper tube 61 and a lower tube 62.

For the first and second positions, as shown in fig. 14 and 15. FIG. 14 discloses the bridge plug assembly in a first position. FIG. 15 discloses the bridge plug assembly in a second position.

As shown in fig. 14, the safety diaphragm 1 is supported by the diaphragm holder 2. The diaphragm seat 2 is composed of a seat body 21, and the seat body 21 provides required support for the rupture disk 1. The seat body 21 is also formed with a crushing member accommodating chamber 22. When the diaphragm seat 2 moves downwardly, the bridge plug assembly 100 moves from the first position to the second position, at which time the crushing member 3 moves through the crushing member accommodating chamber 22 of the diaphragm seat 2.

The seat 21 is located above a portion of the shear ring 4. A diaphragm seat receiving space 34 is formed below the shear ring 4, which is a part of the lower housing 52, the diaphragm seat receiving space 34 being capable of allowing the diaphragm seat 2, the shear ring 4, to partially move downward. When in the first position, the shear ring 4 provides support for the membrane holder 2. When in the second position, the shear ring 4 is sheared into two sections by external force, and the seat body 21 falls down with the ring body 41 into the diaphragm seat receiving space 34. The function of the diaphragm seat receiving space 34 is to provide space for the diaphragm seat 2 to move when the bridge plug assembly 100 is moved from the first position to the second position. It should be noted that the diaphragm seat receiving space 34 must be dimensioned such that it can be moved in order to bring the safety diaphragm 1 into contact with the rupture member 3, even if a portion of the shear ring 4 is below the diaphragm seat 2.

The bridge plug assembly 100 of the present application is disposed in the housing 5 of a partial tubular string 6. The housing 5 is composed of an upper housing 51 and a lower housing 52. The upper housing 51 is disposed in the upper tube 61 and the lower housing 52 is disposed in the lower tube 62.

The crushing members 3 are located on a portion of the shear ring 4. The function of the breaker elements 3 is to break the rupture disc 1 when it enters the second position. The crushing member comprises a crushing member body 31 partially supported by the shear ring 4. The crushing body 33 is disposed within the crushing member body 31. In this way, the crushing body 33 can be supported and fixed in position. At the end where the crushing body 33 is, is the crushing surface 331. When the bridge plug assembly 100 is moved to the second position, the support surface 12 contacts the crushing surface 331, thereby crushing the rupture disc 1 into fragments and restoring the flow of liquid to a portion of the tubing string 6. It is noted that although an elongated crushing body 33 is preferred, the crushing body 33 may be provided in other shapes. For example, the crushing body 33 may be a bolt or a spike.

The crushing body 33 is shown as an elongated object in the figure. It is to be noted that the crushing body 33 may also be the end of the crushing member body 31 itself. Thus, the end surface of the distal end of the crushing member body 31 becomes the crushing surface 331. The tip of the rupture member body 31 is adjustable to make it easier for the rupture disc 1 to rupture. For example, the end of the crushing member body 31 may be sharpened at a point to serve as the crushing surface 331. It can be seen from the figure that the crushing member body 31 and the crushing body 33 are two separate pieces, but they can also be made in one piece. In this case, the crushing body 33 will be considered as a part of the crushing member 3, a part of which enters the crushing member accommodating chamber 22 of the diaphragm seat 2.

In the prior art, the breaking member 3 is usually fixed and the rupture disc 1 rests on a breaking body 33, for example a bolt or spike, of the breaking body 33. The crushing body 33 projects from the housing into the inner bore at a 90 angle. The rupture disc 1 may be quite stiff and require a significant force to break. This combination of force and stiffness can cause the bolts to begin to wear and the connection to the wall connection point to weaken. The forces exerted on the bolt can weaken the bolt where it is supported against the wall (and in the worst case may shear). This problem is rapidly magnified if a plurality of frangible discs (rupture discs) are used. The bolts extending from the housing will typically extend only a small distance into the inner bore of the tubular section to reduce the likelihood of the large bolts being sheared. However, this means that the outer surface of the safety diaphragm 1 rarely comes into contact with the crushing members.

The crushing member 3 shown in the figures of the present embodiment is much less affected by shearing, preferably at an angle of not 90 to the shell 5 discussed above. Instead, only a part of the downward force of the rupture disc 1 will cut through the crushing body 33 at an angle, and the remaining force will be transmitted to the crushing body 33 and the crushing member body 31. Furthermore, since the crushing member is angled in the figure, it will allow the crushing body 33 to be pushed into more of the surface of the rupture disc 1. The angle between the shell 5 and the crushing body 33 is shown in the figure to be about 10 deg., preferably less than 45 deg.. This effectively balances the strength of the crushing members 3 and the destructiveness to the rupture disc 1 (single or multiple).

Refer to fig. 16. Fig. 16 discloses a detailed schematic view of the membrane holder 2 and the shear ring 4. The diaphragm seat 2 serves to support the safety diaphragm 1 through the seat body 21. The seat 21 is supported by the ring lugs 43 and the ring body 41 supports the crushing member 3. When the force applied to rupture disk 1 is above the shear ring threshold, it will shear along shear ring shear line 42. Thereby, the shear ring 4 is divided into two parts. Seat body 21 pushes down on collar lug 43 and seat body 21 will enter membrane seat receiving space 34 and continue to move downward until contacting a portion of bridge plug assembly 100 which does not move relative to tubing string 6. Fig. 13 shows a portion of the lower tubular string 62. The ring body 41 will remain in place and support the crushing member body 31.

Refer to fig. 17-20. Fig. 17-20 show the bridge plug assembly 100 in operation. When the bridge plug assembly 100 is in the first position, as shown in FIG. 17, the rupture disc 1 is disposed within the housing 5 formed by the stem 6. The diaphragm seat 2 supports the safety diaphragm 1 with the support surface 12 at a distance from the crushing surface 331 of the crushing body 33, the diaphragm seat 2 and the crushing member 3 being supported by the shear ring 4.

Fig. 18 discloses a schematic view of the bridge plug assembly 100 in a second position. When a threshold force is applied to the top of the rupture disc 1, the shear ring 4 is sheared into two pieces, the diaphragm seat 2 moves downwards and the rupture disc 1 also moves downwards. The support surface 12 is in turn brought into contact with the crushing surface 331 of the crushing body 33, causing the rupture of the rupture disk 1.

When the bridge plug 100 is in the second position, the force on the rupture disc 1 causes the fracture surface 331 on the fracture body 33 to move further into the rupture disc 1. Ensuring that the rupture disc 1 is broken. The rupture discs 1 are arranged in a plurality or spaced apart and stacked to achieve the rupture purpose, thereby achieving the flow of fluid in the pipe string 6, as shown in fig. 20. In this view, since the safety diaphragm has now disappeared, it can be seen that a second breaker body (total 3) protrudes at an angle from the breaker body.

Where not mentioned in this application, can be accomplished using or referencing existing technology. The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A bridge plug assembly comprising a housing (5), characterized by further comprising, inside the housing (5):

a rupture disc (1) having a support surface (12);

a diaphragm seat (2), the diaphragm seat (2) comprising a seat body (21), the seat body (21) being formed with a crushing member accommodating chamber (22), the seat body (21) supporting a rupture disc (1);

a shear ring (4) supporting the membrane holder (2), a membrane holder receiving space (34) being provided below the shear ring (4);

a crushing member (3) comprising a crushing member body (31), an extension (32) extending towards the safety diaphragm (1) being provided on the crushing member body (31), the extension (32) having a crushing surface (331), the shear ring (4) being arranged between the crushing member (3) and the housing (5);

the bridge plug assembly having a first position and a second position;

in the first position, the crushing surface (331) is remote from the support surface (12), the shear ring (4) and the rupture disc (1) being in an intact condition;

in the second position, the crushing surface (331) abuts against the support surface (12), the shearing ring (4) and the safety diaphragm (1) become in an incomplete state, wherein, when a preset pressure threshold is applied to the top of the safety diaphragm (1), the diaphragm seat (2) moves axially downwards due to the pressure of the safety diaphragm (1), the shearing ring (4) is sheared by the force and partially enters the diaphragm seat accommodating space (34), the crushing member (3) partially enters the crushing member accommodating cavity (22), and the crushing surface (331) passes through the crushing member accommodating cavity (22) to abut against the support surface (12) to crush the safety diaphragm (1).

2. Bridge plug assembly according to claim 1, characterized in that the crushing member (3) is supported by the shear ring (4).

3. Bridge plug assembly according to claim 1 or 2, wherein the breaking member (3) further comprises a breaking body (33) arranged on the breaking member body (31), a top surface of the breaking body (33) forming the breaking face (331), the breaking body (33) having a pointed or elongated body structure.

4. Bridge plug assembly according to claim 1 or 2, characterized in that the shear ring (4) comprises a ring body (41) and a ring lug (43), the ring lug (43) being provided on the ring body (41) and the ring lug (43) being separable from the ring body (41) at a shear line (42) of the ring body (41).

5. Bridge plug assembly according to claim 4, wherein the ring lugs (43) are located inside the ring body (41), the shear ring (4) comprising a plurality of ring lugs (43), the plurality of ring lugs (43) being evenly spaced inside the ring body (41).

6. Bridge plug assembly according to claim 4, characterized in that the ring lugs (43) have the same thickness as the ring body (41).

7. Bridge plug assembly according to claim 1, wherein the crushing member (3) has a plurality of extensions (32), the number of extensions (32) being three.

8. Bridge plug assembly according to claim 3, characterised in that the angle of the crushing body (33) to the housing (5) is less than 45 °.

9. Bridge plug assembly according to claim 1 or 2, further comprising a diaphragm seal (11), the diaphragm seal (11) being arranged between the rupture disc (1) and the housing (5), the diaphragm seal (11) being in sealing engagement with both the rupture disc (1) and the housing (5) in the first position and/or the second position.

10. Bridge plug assembly according to claim 1 or 2, characterized in that the safety diaphragm (1) is formed by one or more layers of glass.