A quick-drilling bridge plug

Abstract

The present invention discloses a quick-drilling bridge plug, which includes a central tube, a joint assembly, a piston, a first rubber ring and slips. The joint assembly includes a first joint and a fixing assembly. The first joint is installed on the outer side of the first end of the central tube and is used for connecting a setting tool. The fixing assembly is installed on the outer side of the second end of the central tube. The piston is sleeved on the outer side of the central tube and is connected to the first joint by shear pins. The piston is used to move towards the fixing assembly under the push of the setting tool. The first rubber ring is sleeved on the outer side of the piston. One end of the first rubber ring close to the first joint is in limit contact with the piston to slide towards the fixing assembly along with the piston. The slips are sleeved on the outer side of the central tube and are located between the piston and the fixing assembly. One end of the slips close to the first joint is a first tapered section, and the inner hole of the first tapered section is conical. Compared with the prior art, in the present invention, the first rubber ring is sleeved on the outer side of the piston, reducing the overall axial dimension of the quick-drilling bridge plug, thereby reducing the drilling time of the quick-drilling bridge plug after the fracturing operation is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of oil extraction, and particularly to a quick-drilling bridge plug. Background Art

[0002] For low-permeability reservoirs, the production of conventional extraction methods is relatively low. Usually, the method of fracturing stimulation is adopted to improve the extraction efficiency, and the bridge plug is a commonly used tool for fracturing stimulation. During operation, usually, a perforating gun, a setting tool, and a bridge plug are sent into the casing. The bridge plug is fixed at a designated position through the setting tool. The bridge plug expands and blocks the casing. Then, the perforating gun is used to perforate the side of the bridge plug close to the wellhead, and then a fracturing operation is performed on the perforated position to increase the permeability of the reservoir.

[0003] The bridge plug includes various types such as a quick-drilling bridge plug (or drillable bridge plug), a soluble bridge plug, etc., so as to destroy the bridge plug by drilling or dissolving after the fracturing operation, so that the casing is released from being blocked. For the quick-drilling bridge plug, a plurality of components such as a piston, slips, and rubber cylinders are axially distributed on the outer side of the central tube, resulting in a relatively large axial dimension and reducing the drilling efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a quick-drilling bridge plug to improve the drilling efficiency after the fracturing operation.

[0005] To achieve the above purpose, the present invention provides the following solutions:

[0006] The present invention discloses a quick-drilling bridge plug, including:

[0007] A central tube;

[0008] A joint assembly, the joint assembly includes a first joint and a fixing component; the first joint is installed on the outer side of the first end of the central tube and is used for connecting the setting tool; the fixing component is installed on the outer side of the second end of the central tube;

[0009] A piston, the piston is sleeved on the outer side of the central tube and is connected to the first joint through a shear pin, and the piston is used to move towards the fixing component under the push of the setting tool;

[0010] A first rubber ring, the first rubber ring is sleeved on the outer side of the piston; one end of the first rubber ring close to the first joint is in limit contact with the piston to slide towards the fixing component along with the piston;

[0011] Slips, the slips are sleeved on the outer side of the central tube and are located between the piston and the fixing component. One end of the slips close to the first joint is a first tapered section, and the inner hole of the first tapered section is tapered;

[0012] When the piston slides towards the fixed assembly, the fixed assembly can block the slips, causing the piston to expand the first tapered section, so that the slip teeth on the outer side of the first tapered section bite on the inner wall of the casing. At the same time, the first tapered section expands the first rubber ring to press the first rubber ring against the inner wall of the casing.

[0013] Preferably, the fixed assembly includes a second joint and a second rubber ring. The second joint is installed on the outer side of the second end of the central tube. The second rubber ring is sleeved on the outer side of the second joint, and one end of the second rubber ring away from the first joint abuts against the second joint. One end of the slips close to the second joint is a second tapered section, and the inner hole of the second tapered section is conical. When the piston slides towards the fixed assembly, the second joint can expand the second tapered section, so that the slip teeth on the outer side of the second tapered section bite on the inner wall of the casing. At the same time, the second tapered section expands the second rubber ring to press the second rubber ring against the inner wall of the casing.

[0014] Preferably, a first collar is sleeved on the outer side of the middle of the first rubber ring, and a second collar is sleeved on the outer side of the middle of the second rubber ring.

[0015] Preferably, a third collar is sleeved on the outer side of the middle of the slips.

[0016] Preferably, the material of the central tube is a light alloy.

[0017] Preferably, the material of the central tube is an aluminum-magnesium alloy.

[0018] Preferably, the outer side of the first tapered section is conical, and the inner conical surface and the outer conical surface of the first tapered section form a first annular protrusion protruding towards the first end of the central tube. The end of the piston close to the slips has a first outer conical surface, and the end of the first rubber cylinder close to the slips has a first inner conical surface. The first outer conical surface and the first inner conical surface form a first annular groove for the first annular protrusion to insert.

[0019] Preferably, the outer side of the second tapered section is conical, and the inner conical surface and the outer conical surface of the second tapered section form a second annular protrusion protruding towards the second end of the central tube. The end of the second joint close to the slips has a second outer conical surface, and the end of the second rubber cylinder close to the slips has a second inner conical surface. The second outer conical surface and the second inner conical surface form a second annular groove for the second annular protrusion to insert.

[0020] The present invention has achieved the following technical effects compared with the prior art:

[0021] In the quick-drilling bridge plug of the present invention, since the first rubber ring is sleeved outside the piston and the two overlap each other, the overall axial dimension of the quick-drilling bridge plug is reduced, thereby reducing the drilling time of the quick-drilling bridge plug after the fracturing operation is completed and improving the working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the quick-drilling bridge plug according to an embodiment of the present invention;

[0024] Description of the reference numerals: 1 - central tube; 2 - first joint; 3 - shear pin; 4 - piston; 5 - first rubber ring; 6 - slip; 7 - second rubber ring; 8 - second joint; 51 - first ferrule; 61 - first tapered section; 62 - second tapered section; 63 - slip teeth; 64 - third ferrule; 71 - second ferrule. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0026] The purpose of the present invention is to provide a quick-drilling bridge plug to improve the drilling efficiency after fracturing operations.

[0027] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0028] Refer to Figure 1 , this embodiment provides a quick-drilling bridge plug, including a central tube 1, a joint assembly, a piston 4, a first rubber ring 5 and a slip 6.

[0029] The joint assembly includes a first joint 2 and a fixing assembly. The first joint 2 is installed outside the first end of the central tube 1 and is used to connect the setting tool. The fixing assembly is installed outside the second end of the central tube 1.

[0030] The piston 4 is sleeved outside the central tube 1 and connected to the first joint 2 through a shear pin 3. The piston 4 is used to slide towards the fixing component under the push of the setting tool. When the thrust of the setting tool on the piston 4 reaches a certain threshold, the piston 4 shears the shear pin 3, and then the piston 4 slides towards the fixing component. The first rubber ring 5 is sleeved outside the piston 4. One end of the first rubber ring 5 close to the first joint 2 abuts against the piston 4 in a limiting manner to slide towards the fixing component along with the piston 4. The slip 6 is sleeved outside the central tube 1 and located between the piston 4 and the fixing component. One end of the slip 6 close to the first joint 2 is a first tapered section 61, and the inner hole of the first tapered section 61 is tapered. Wherein, when the piston 4 slides towards the fixing component, the fixing component can block the slip 6, so that the piston 4 expands the first tapered section 61, so that the slip teeth 63 outside the first tapered section 61 bite on the inner wall of the casing, and at the same time the first tapered section 61 expands the first rubber ring 5 to press the first rubber ring 5 against the inner wall of the casing.

[0031] The working principle of the quick-drilling bridge plug in this embodiment is as follows:

[0032] The perforating gun, the setting tool and the quick-drilling bridge plug are sent to the designated position in the casing, so that the sphere blocks the inner hole of the first joint 2, and the piston 4 is pushed to slide towards the fixing component through the setting tool. Since the fixing component can block the slip 6, the piston 4 enters the first tapered section 61 and expands the first tapered section 61 when sliding, so that the slip teeth 63 outside the first tapered section 61 bite on the inner wall of the casing, thereby fixing the quick-drilling bridge plug on the casing. At the same time, as the diameter of the first tapered section 61 increases, the first tapered section 61 expands the first rubber ring 5 and presses the first rubber ring 5 against the inner wall of the casing, thereby blocking the gap between the central tube 1 and the casing. After that, the side of the quick-drilling bridge plug close to the wellhead is perforated with a perforating gun, and then a fracturing operation is performed on the perforated position to increase the permeability of the reservoir.

[0033] It should be noted that in the prior art, the rubber ring and the piston 4 do not overlap axially on the central tube 1. In this embodiment, since the first rubber ring 5 is sleeved outside the piston 4 and the two overlap each other, the overall axial dimension of the quick-drilling bridge plug is reduced, thereby reducing the drilling time of the quick-drilling bridge plug after the fracturing operation is completed and improving the work efficiency.

[0034] As a possible example, in this embodiment, the fixing assembly includes a second connector 8 and a second rubber ring 7. The second connector 8 is installed on the outer side of the second end of the central tube 1, the second rubber ring 7 is sleeved on the outer side of the second connector 8, and one end of the second rubber ring 7 away from the first connector 2 abuts against the second connector 8. One end of the slip 6 close to the second connector 8 is a second tapered section 62, and the inner hole of the second tapered section 62 is tapered. When the piston 4 slides towards the fixing assembly, the second connector 8 can expand the second tapered section 62 so that the slip teeth 63 on the outer side of the second tapered section 62 bite on the inner wall of the casing, and at the same time expand the second tapered section 62 to press the second rubber ring 7 against the inner wall of the casing. In this embodiment, the partition is carried out simultaneously through the first rubber ring 5 and the second rubber ring 7, improving the partition effect. In addition, in this embodiment, the fixing is carried out simultaneously through the slip teeth 63 on the outer side of the first tapered section 61 and the slip teeth 63 on the outer side of the second tapered section 62, improving the fixing effect of the quick-drilling bridge plug on the inner wall of the casing.

[0035] As a possible example, in this embodiment, a first ferrule 51 is sleeved on the outer side of the middle part of the first rubber ring 5, and a second ferrule 71 is sleeved on the outer side of the middle part of the second rubber ring 7. Further, in this embodiment, a third ferrule 64 is sleeved on the outer side of the middle part of the slip 6. In this way, the middle part of the first rubber ring 5 is tightened by the first ferrule 51, the middle part of the second rubber ring 7 is tightened by the second ferrule 71, and the middle part of the slip 6 is tightened by the third ferrule 64, making the overall structure more compact.

[0036] As a possible example, in this embodiment, the material of the central tube 1 is light alloy. The light alloy has a small density. After the drilling operation, its powder is easy to float on the liquid surface, avoiding blocking the casing. It can be understood that except for the first rubber ring 5 and the second rubber ring 7 (whose material is rubber), the components in this embodiment can all be selected from light alloy materials. According to different actual needs, the slip 6 can also be made of other common materials.

[0037] As a possible example, in this embodiment, the material of the central tube 1 is aluminum-magnesium alloy. According to different actual needs, those skilled in the art can also select central tubes 1 made of other materials.

[0038] As a possible example, in this embodiment, the outer side of the first tapered section 61 is tapered, and the inner tapered surface and the outer tapered surface of the first tapered section 61 form a first annular protrusion protruding towards the first end of the central tube 1. One end of the piston 4 close to the slip 6 has a first outer tapered surface, and one end of the first rubber cylinder close to the slip 6 has a first inner tapered surface. The first outer tapered surface and the first inner tapered surface form a first annular groove for the first annular protrusion to insert. During use, the first outer tapered surface is in sliding contact with the inner tapered surface of the first tapered section 61, and the first inner tapered surface is in sliding contact with the outer tapered surface of the first tapered section 61.

[0039] As a possible example, in this embodiment, the outer side surface of the second conical section 62 is conical, and the inner conical surface and the outer conical surface of the second conical section 62 form a second annular protrusion protruding towards the second end of the central tube 1. One end of the second joint 8 close to the slip 6 has a second outer conical surface, and one end of the second rubber cylinder close to the slip 6 has a second inner conical surface. The second outer conical surface and the second inner conical surface form a second annular groove for inserting the second annular protrusion. During use, the second outer conical surface is in sliding contact with the inner conical surface of the second conical section 62, and the second inner conical surface is in sliding contact with the outer conical surface of the second conical section 62.

[0040] In this specification, specific examples are used to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A quick-drilling bridge plug, characterized in that, Comprising: Central tube; Adapter assembly, the adapter assembly includes a first adapter and a fixing assembly; the first adapter is installed outside the first end of the central tube for connecting the setting tool; the fixing assembly is installed outside the second end of the central tube; Piston, the piston is sleeved outside the central tube and is connected to the first adapter by a shear pin, and the piston is used to slide towards the fixing assembly under the push of the setting tool; First rubber ring, the first rubber ring is sleeved outside the piston; one end of the first rubber ring close to the first adapter is in limiting contact with the piston to slide towards the fixing assembly along with the piston; Slip, the slip is sleeved outside the central tube and is located between the piston and the fixing assembly, one end of the slip close to the first adapter is a first tapered section, and the inner hole of the first tapered section is conical; Wherein, when the piston slides towards the fixing assembly, the fixing assembly can block the slip, so that the piston expands the first tapered section, so that the slip teeth outside the first tapered section bite on the inner wall of the casing, and at the same time the first tapered section expands the first rubber ring to press the first rubber ring against the inner wall of the casing; A first collar is sleeved outside the middle of the first rubber ring; the outer side of the first tapered section is conical, and the inner conical surface and the outer conical surface of the first tapered section form a first annular protrusion protruding towards the first end of the central tube; one end of the piston close to the slip has a first outer conical surface, and one end of the first rubber ring close to the slip has a first inner conical surface; the first outer conical surface and the first inner conical surface form a first annular groove for inserting the first annular protrusion.

2. The quick-drilling bridge plug according to claim 1, wherein The fixing assembly includes a second adapter and a second rubber ring, the second adapter is installed outside the second end of the central tube, the second rubber ring is sleeved outside the second adapter, and one end of the second rubber ring away from the first adapter is in contact with the second adapter; one end of the slip close to the second adapter is a second tapered section, and the inner hole of the second tapered section is conical; when the piston slides towards the fixing assembly, the second adapter can expand the second tapered section, so that the slip teeth outside the second tapered section bite on the inner wall of the casing, and at the same time the second tapered section expands the second rubber ring to press the second rubber ring against the inner wall of the casing.

3. The quick-drilling bridge plug according to claim 2, wherein, A second collar is sleeved outside the middle of the second rubber ring.

4. The quick-drilling bridge plug according to claim 3, wherein, A third collar is sleeved outside the middle of the slip.

5. The quick-drilling bridge plug according to claim 1, characterized in that, The material of the central tube is lightweight alloy.

6. The quick-drilling bridge plug according to claim 5, wherein, The material of the central tube is aluminum-magnesium alloy.

7. The quick-drilling bridge plug according to claim 2, wherein The outer side of the second tapered section is conical, and the inner conical surface and the outer conical surface of the second tapered section form a second annular protrusion protruding towards the second end of the central tube; one end of the second adapter close to the slip has a second outer conical surface, and one end of the second rubber ring close to the slip has a second inner conical surface; the second outer conical surface and the second inner conical surface form a second annular groove for inserting the second annular protrusion.

Images