Fracturing disc type full-soluble two-way anchoring plugging bridge plug

Abstract

The utility model discloses a kind of rupture disc type full-soluble two-way anchoring plugging bridge plug, including sequentially connected push cylinder, push cylinder compression cylinder, mandrel, cone, pilot head assembly;Still include rupture disc, setting in pilot head assembly internal step;The mandrel is arranged in cone, one end is connected with pilot head assembly by shear pin, and it is towards rupture disc, another end is connected push cylinder by screw thread connection.The utility model is after fracturing or perforating is completed, when there is pressure in wellhead, it is first lowered into well depth using cable or coiled tubing, wellbore is short-term blocked, wellhead pressure is released to make bridge plug and wellhead this section pressureless, then wellhead replacement is completed, conventional operation is carried out to lower production string into well design depth, install production wellhead, finally wellhead pressure is crushed to the rupture disc in soluble bridge plug, make bridge plug upper and lower intercommunication, it can be first time to realize the production of the well, subsequent with the dissolution of soluble bridge plug, realize full-bore wellbore.

Description

Technical Field

[0001] This utility model belongs to the field of energy operations such as oil and gas, and specifically relates to a rupture disc type fully soluble bidirectional anchoring and sealing bridge plug. Background Technology

[0002] In the oil and gas production sector, wellbore plugging tools are diverse in type, used for various purposes depending on the operational needs, including drilling, completion, and workover. Permanent packers, retrievable temporary packers, and soluble bridge plugs are widely used and highly effective. After well completion or workover, running production or testing tubing under pressure without controlling the well offers advantages such as protecting oil and gas reservoirs and reducing formation contamination, making it increasingly popular in oilfields.

[0003] Currently, after fracturing or perforation, there are two operational methods for running production or testing tubing in pressurized oil and gas wells at the wellhead: one is to run the production tubing directly into the well using a live-line workover rig, and the other is to run the production or testing tubing during conventional operations after well control has stabilized. Running the production tubing with a live-line workover rig offers good reliability and safety, but it is expensive and has a long operation cycle. Conventional operations require well control to stabilize, increasing well control costs and potentially causing secondary formation contamination. If a channelless soluble bridge plug is used, it is necessary to wait for the plug to dissolve before it can communicate with the formation, preventing immediate formation communication (and posing a risk of tubing blockage after dissolution), resulting in a long waiting time for production. The question of whether there is a way to use a bridge plug that can communicate with the formation immediately after the production tubing is run into the well, without requiring subsequent dissolution time, thus improving operational efficiency and reducing costs, has become a pressing issue in the field. Utility Model Content

[0004] In view of this, the main objective of this utility model is to provide a rupture disc type fully soluble bidirectional anchoring and sealing bridge plug.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug includes a pusher, a pusher cylinder, a mandrel, a cone, and a guide head assembly connected in sequence.

[0007] It also includes a rupture disc, which is located at the step inside the guide head assembly;

[0008] The mandrel is inserted into the cone, with one end connected to the guide head assembly via a shear pin and facing the rupture disc, and the other end connected to the push cylinder via a thread.

[0009] Preferably, the mandrel is provided with an annular shear groove, which is combined with a shear pin. The shear strength of the shear pin is designed to be the shear force required for the bridge plug to separate from the push cylinder after the setting is completed.

[0010] Preferably, it also includes a bidirectional anchoring chuck body, which is divided into multiple externally supportable block units by grooves and has a conical hole inside that mates with the cone.

[0011] Preferably, the block unit of the bidirectional anchoring slip body is provided with bidirectionally distributed locking teeth, and the groove depth between adjacent block units is 70-85% of the slip body wall thickness. The bidirectional anchoring slip body forms bidirectional anchoring with the sleeve wall through the bidirectionally distributed locking teeth.

[0012] Preferably, the guide head assembly includes a guide head and a connecting cylinder, through which the guide head and the bidirectional anchoring slip are connected; the guide head is provided with a step, and the bowl of the rupture disc is placed on the step to restrict the axial movement of the rupture disc.

[0013] Preferably, it also includes an outer rubber sleeve and a protective bowl, which are sequentially fitted onto the large outer diameter section of the cone and positioned by a spacer ring.

[0014] Preferably, it also includes an inner rubber sleeve, which is fixed to the inner cavity of the connecting cylinder by fixing screws, and the inner diameter is smaller than the small outer diameter section of the cone.

[0015] Preferably, the rupture disc has a bowl-shaped structure, with the pressure resistance at the rim being greater than that at the bottom, and the critical rupture pressure being 15-35 MPa.

[0016] Preferably, the inner cavity of the connecting cylinder is provided with a stepped sealing groove, and the end of the inner rubber cylinder is pressed and fixed in the stepped sealing groove by fixing screws.

[0017] Preferably, the chamfered side of the protective bowl is provided with radial reinforcing ribs, and its planar side forms a surface contact with the end face of the outer rubber tube.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] This invention, after fracturing or perforation is completed and the wellhead is pressurized, uses a cable or coiled tubing to first lower the cable or coiled tubing into the well to the designed depth, temporarily sealing the wellbore. The wellhead pressure is then released, depressurizing the section between the bridge plug and the wellhead. Following this, the wellhead is replaced, and conventional operations are performed to lower the production tubing into the well to the designed depth and install the production wellhead. Finally, pressure is applied to the wellhead to crush the fractured disc in the soluble bridge plug, connecting the upper and lower sections of the bridge plug. This allows for immediate production of the well. Subsequently, as the soluble bridge plug dissolves, a full-bore wellbore is achieved. This operational method significantly reduces overall operating costs and greatly improves operational efficiency. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this invention, illustrate exemplary embodiments of the present invention and, together with their description, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0021] Figure 1 This invention provides a schematic diagram of the structure of a rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to an embodiment of the present invention.

[0022] Figure 2 for Figure 1 Sectional view along the AA direction.

[0023] In the diagram, 1. Rupture disc; 2. Push cylinder; 3. Push cylinder pressure cylinder; 4. Mandrel; 5. Cone; 6. Protective bowl; 7. Rubber sleeve; 8. Spacer ring; 9. Bidirectional anchoring slip body; 10. Shear pin; 11. Guide head; 12. Inner rubber sleeve; 13. Cup head screw; 14. Sealing O-ring; 15. Fixing screw; 16. Connecting cylinder. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, article, or apparatus that includes that element.

[0027] This utility model embodiment provides a rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug, such as Figure 1 , 2 As shown, it includes a pusher cylinder 2, a pusher cylinder pressure cylinder 3, a mandrel 4, a cone 5, and a guide head assembly connected in sequence;

[0028] It also includes a rupture disc 1, which is located at the step inside the guide head assembly;

[0029] The mandrel 4 is inserted inside the cone 5, with one end connected to the guide head assembly via a shear pin 10 and facing the rupture disc 1, and the other end connected to the push cylinder 2 via a thread.

[0030] This invention, after fracturing or perforation is completed and the wellhead is pressurized, uses a cable or coiled tubing to first lower the plug into the well to the designed depth, temporarily sealing the wellbore. The wellhead pressure is then released, depressurizing the section between the plug and the wellhead. Following this, the wellhead is replaced, and conventional operations are performed to lower the production tubing to the designed depth and install the production wellhead. Finally, pressure is applied to the wellhead to crush the fractured disc in the soluble plug, connecting the plug and allowing for immediate production. Subsequently, as the soluble plug dissolves, a full-bore wellbore is achieved. This method significantly reduces overall operating costs and greatly improves operational efficiency.

[0031] The mandrel 4 is provided with an annular shearing groove, which is combined with the shearing pin 10. The shearing strength of the shearing pin 10 is designed to be the shearing force required for the bridge plug to separate from the push cylinder 2 after the setting is completed.

[0032] The front of the guide head assembly is chamfered to serve as a guide. It has a step inside for placing the rupture disc 1, and a sealing groove is provided at the inner diameter where it contacts the rupture disc 1. The gap between the rupture disc 1 and the guide head assembly is sealed by the sealing ring 14, thereby achieving a sealing function.

[0033] Furthermore, it also includes a bidirectional anchoring clasp 9, which is divided into multiple externally supportable block units by grooves, and has a conical hole inside that mates with the cone 5.

[0034] The block unit of the bidirectional anchoring slip 9 is provided with bidirectionally distributed locking teeth, and the groove depth between adjacent block units is 70-85% of the wall thickness of the slip body. The bidirectional anchoring slip 9 forms bidirectional anchoring with the sleeve wall through the bidirectionally distributed locking teeth.

[0035] When the block unit of the bidirectional anchoring slip 9 is supported externally, it will also move upward along the screw part of the cup head screw 13 while the cup head screw 13 remains stationary, so that the bidirectional anchoring slip 9 will not separate from the connecting cylinder 16.

[0036] The bidirectional anchoring slip body 9 is a double slip anchoring system with bidirectional locking teeth that can withstand both vertical and horizontal pressure.

[0037] Of course, the bidirectional anchoring slip 9 can also be a single slip anchoring with a single slip bearing pressure in one direction.

[0038] Furthermore, the guide head assembly includes a guide head 11 and a connecting cylinder 16, through which the guide head 11 and the bidirectional anchoring slip body 9 are connected.

[0039] The shear pin 10 passes through the connecting cylinder 16 and connects to the mandrel 4.

[0040] Furthermore, a sealing ring 14 is provided between the shear pin 10 and the connecting cylinder 16, and a sealing ring 14 is also provided in the gap between the sealing rupture disc 1 and the guide head 11.

[0041] The guide head 11 is connected to the connecting cylinder 16 via a threaded connection. The connecting cylinder 16 has a slot on the other side for attaching the bidirectional anchoring slip body 9. The outer diameter of the connecting cylinder 16 has a shear pin hole and a sealing ring 14 that seals with the shear pin 10. It also has a cup head screw thread groove for connecting the cup head screw 13.

[0042] Furthermore, it also includes an outer rubber sleeve 7 and a protective bowl 6, which are sequentially fitted onto the large outer diameter section of the cone 5 and positioned by a spacer ring 8.

[0043] For example, the outer rubber sleeve 7 is made of a magnesium-aluminum alloy-based soluble elastic material that completely dissolves in the wellbore fluid environment within 72-240 hours.

[0044] Furthermore, it also includes an inner rubber sleeve 12, which is fixed to the inner cavity of the connecting sleeve 16 by a fixing screw 15, and the inner diameter is smaller than the small outer diameter section of the cone 5.

[0045] For example, the small outer diameter section of the cone 5 and the inner rubber cylinder 12 have an interference fit of 0.5-1.2 mm, forming a metal-elastomer composite sealing structure.

[0046] The inner cavity of the connecting cylinder 16 is provided with a stepped sealing groove, and the end of the inner rubber cylinder 12 is pressed and fixed in the stepped sealing groove by a fixing screw 15.

[0047] Furthermore, the rupture disc 1 has a bowl-shaped structure, with the pressure resistance at the rim being greater than that at the bottom, and the critical rupture pressure being 15-35 MPa.

[0048] The fracture disk 1 is made of ceramic material, such as alumina ceramic (Al2O3), zirconia ceramic (ZrO2), silicon nitride ceramic (Si3N4), or silicon carbide ceramic (SiC).

[0049] Furthermore, the block units of the bidirectional anchoring tack 9 are provided with bidirectionally distributed locking teeth, and the groove depth between adjacent block units is 70-85% of the tack wall thickness.

[0050] Furthermore, the inner cavity of the connecting cylinder 16 is provided with a stepped sealing groove, and the end of the inner rubber cylinder 12 is pressed and fixed in the stepped sealing groove by a cup-head screw 13.

[0051] The guide head 11 is provided with a spiral guide groove with a guide angle of 30-45 degrees.

[0052] Furthermore, the chamfered side of the protective bowl 6 is provided with radial reinforcing ribs, and its planar side forms a surface contact with the end face of the outer rubber tube 7.

[0053] The working process of this utility model is as follows:

[0054] Tool lowering: The bridge plug is delivered to the designed position downhole via cable or coiled tubing. The pusher 2 is connected to the setting tool (such as a hydraulic setting tool), and the mandrel 4 is fixed to the connecting cylinder 16 via shear pin 10.

[0055] Bidirectional anchoring start: The setting tool applies hydraulic thrust, pushing the cone 5 forward along the mandrel 4. The conical part of the cone 5 pushes open the block unit of the bidirectional anchoring slip 9, causing it to be externally supported and embedded in the casing wall, achieving bidirectional anchoring (resisting bidirectional pressure in the wellbore) through the bidirectional locking teeth.

[0056] Seal formation: When the cone 5 moves forward, its large outer diameter section expands the protective bowl 6, the outer rubber sleeve 7 and the spacer ring 8, causing the outer rubber sleeve 7 to expand and seal the sleeve annular space; at the same time, the small outer diameter section of the cone 5 is inserted into the inner rubber sleeve 12 of the connecting sleeve 16, squeezing the inner rubber sleeve 12 to form an internal seal, preventing fluid from leaking through the groove of the bidirectional anchoring slip body 9.

[0057] Tool disengagement: When the setting pressure reaches the set value, the shear pin 10 breaks, the mandrel 4 disengages from the connecting cylinder 16, and the pusher tool carries the mandrel up to the wellhead, and the bridge plug is independently anchored in the wellbore.

[0058] Pressure isolation: The bidirectional anchoring slip 9 and the outer rubber sleeve 7 work together to isolate the wellbore pressure above and below the bridge plug, achieving short-term plugging. At this time, the rupture disc 1 acts as a temporary barrier, sealing the central channel of the connecting sleeve 16.

[0059] Wellhead depressurization: After wellhead depressurization, the wellhead and bridge plug section of the wellbore are in a depressurized state, allowing for safe replacement of the wellhead or routine running of the production tubing.

[0060] Fracturing and Breaking Plate: After the production tubing is run in, the wellhead is pressurized to the critical pressure (15-35 MPa) of the fracture plate 1. The bottom end (low-pressure side) of the fracture plate 1 ruptures first due to its weak structure, forming a central fluid channel that connects the wellbore above and below the bridge plug.

[0061] Immediate production start-up: After the rupture disc 1 is broken, the oil and gas flow directly into the production tubing through the central channel of the guide head 11 and the connecting cylinder 16, achieving immediate production start-up without waiting for the bridge plug to dissolve.

[0062] Degradation of soluble materials: Soluble components such as the outer rubber sleeve 7 and the bidirectional anchoring slip 9 (such as magnesium-aluminum alloy-based materials) gradually dissolve in the wellbore fluid environment, with a dissolution cycle of 72-240 hours.

[0063] Full-bore restoration: After dissolution, only fragments of the fractured disc 1 remain (the ceramic material can be discharged through backflow), and the wellbore is restored to full-bore condition, avoiding the risk of blockage caused by the residue of traditional bridge plugs.

[0064] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug, characterized in that, It includes a pusher cylinder, a pusher cylinder pressure cylinder, a mandrel, a cone, and a guide head assembly connected in sequence; It also includes a rupture disc, which is located at the step inside the guide head assembly; The mandrel is inserted into the cone, with one end connected to the guide head assembly via a shear pin and facing the rupture disc, and the other end connected to the push cylinder via a thread.

2. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 1, characterized in that, The mandrel is provided with an annular shear groove, which is combined with a shear pin. The shear strength of the shear pin is designed to be the shear force required for the bridge plug to separate from the push cylinder after the setting is completed.

3. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 1 or 2, characterized in that, It also includes a bidirectional anchoring slip body, which is divided into multiple externally supportable block units by grooves and has a conical hole inside that mates with the cone.

4. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 3, characterized in that, The block unit of the bidirectional anchoring slip is provided with bidirectionally distributed locking teeth, and the groove depth between adjacent block units is 70-85% of the wall thickness of the slip. The bidirectional anchoring slip forms bidirectional anchoring with the sleeve wall through the bidirectionally distributed locking teeth.

5. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 4, characterized in that, The guide head assembly includes a guide head and a connecting cylinder, through which the guide head and the bidirectional anchoring slip body are connected; the guide head is provided with a step, and the bowl of the rupture disc is placed on the step to restrict the axial movement of the rupture disc.

6. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 4, characterized in that, It also includes an outer rubber sleeve and a protective bowl, which are sequentially fitted onto the large outer diameter section of the cone and positioned by a spacer ring.

7. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 5, characterized in that, It also includes an inner rubber sleeve, which is fixed to the inner cavity of the connecting cylinder by fixing screws, and the inner diameter is smaller than the small outer diameter section of the cone.

8. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 7, characterized in that, The rupture disc has a bowl-shaped structure, with the pressure resistance at the rim being greater than that at the bottom, and the critical rupture pressure being 15-35 MPa.

9. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 8, characterized in that, The inner cavity of the connecting cylinder is provided with a stepped sealing groove, and the end of the inner rubber cylinder is pressed and fixed in the stepped sealing groove by fixing screws.

10. The rupture disc-type fully soluble bidirectional anchoring and sealing bridge plug according to claim 6, characterized in that, The protective bowl has radial reinforcing ribs on its chamfered side, and its flat side forms a surface contact with the end face of the outer rubber tube.

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