All-composite quick-drilling bridge plug

Abstract

An all-composite quick drilling bridge plug comprises a center pipe and a fixing pipe, the fixing pipe is located on the rear side of the center pipe, and a circle of slips are arranged on the fixing pipe. The central pipe is composed of a fixing ring, a plurality of supporting rings and a bottom ring. The central pipe and the fixed pipe adopt material innovation and structure reconstruction, the technical contradiction of a traditional bridge plug in the aspects of drilling and grinding efficiency, reliability, adaptability and the like is systematically solved, the composite bridge plug is not affected by corrosive well fluid such as hydrogen sulfide and carbon dioxide, the problems of pitting corrosion, stress corrosion cracking and the like of a traditional metal bridge plug are effectively avoided, and the service life of the bridge plug is prolonged. The material is moderate in hardness, stable in brittleness, small in torque required during drilling and grinding and high in drilling and grinding speed, and the drilling and grinding operation efficiency of the bridge plug is remarkably improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge plugs, and in particular relates to a full-composite material fast-drilling bridge plug. Background Art

[0002] In oil and gas field development, bridge plugs, as key downhole tools, are widely used in operations such as stratified fracturing, well testing, and plugging. Traditional metal bridge plugs have long dominated the market, but their material properties and structural design have gradually become incompatible with the demands of modern, efficient development.

[0003] The main problems exposed by existing traditional metal bridge plugs include: low drilling and grinding efficiency. The high hardness and toughness of the metal material require the use of high-strength drill bits and high torque, resulting in a single bridge plug drilling time of several hours. There is also the risk of material corrosion. Metal bridge plugs are prone to pitting and stress corrosion cracking in corrosive wellbore fluids containing hydrogen sulfide and carbon dioxide. The corrosion failure rate of metal bridge plugs reaches 8% after six months of use in the well, resulting in leakage in the fractured zone and requiring additional investment in equipment for secondary plugging. Therefore, how to solve these technical problems has become a current unresolved technical challenge. Utility Model Content

[0004] The utility model provides a full-composite material fast-drilling bridge plug. The central tube and the fixed tube adopt material innovation and structural reconstruction, which systematically solve the technical contradictions of traditional bridge plugs in drilling and grinding efficiency, reliability, adaptability and other aspects. The composite material bridge plug is not affected by corrosive well fluids such as hydrogen sulfide and carbon dioxide, and effectively avoids the problems of pitting corrosion and stress corrosion cracking of traditional metal bridge plugs. The material has moderate hardness and stable brittleness. The torque required for drilling and grinding is small and the drilling and grinding speed is fast, which significantly improves the drilling and grinding efficiency of the bridge plug.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] A full-composite material rapid drilling bridge plug comprises a center tube and a fixed tube, the fixed tube being located at the rear side of the center tube and being provided with a circle of slips; the center tube is composed of a fixed ring, a plurality of support rings and a bottom ring, the fixed ring and the support ring are provided with horizontal connecting holes arranged correspondingly in front and back, the fixed ring, the support ring and the bottom ring are also provided with vertical connecting holes arranged correspondingly in top and bottom, the bottom ring is provided with two forward-set horizontal connecting rods, the bottom ring is connected in series with the support ring and the fixed ring by means of the two horizontal connecting rods passing through the horizontal connecting holes to form the center tube; the fixed tube is provided with two forward-set vertical connecting rods, the fixed tube is connected in series with the bottom ring, the support ring and the fixed ring by means of the two vertical connecting rods passing through the vertical connecting holes to form the bridge plug; the horizontal connecting rods and the vertical connecting rods are all fixed by bolts.

[0007] The fixing ring and the supporting ring are both composed of four arc-structured assembly blocks.

[0008] The fixed pipe is also provided with a sealing ring, which is located at the rear side of the slip.

[0009] The front side of the sealing ring is provided with a forward-facing slope, and the rear end of the slip is placed on the slope of the sealing ring.

[0010] An adhesive sealing layer is provided between the abutting surfaces of the assembly blocks.

[0011] An adhesive sealing layer is provided between the fitting surfaces of the fixing ring, the supporting ring, the bottom ring and the fixing tube.

[0012] The adhesive sealing layer is heat-resistant epoxy glue or inorganic high-temperature adhesive.

[0013] By adopting the above technical solution, the present invention has the following beneficial effects: the central tube and the fixed tube are made of composite materials, and the central tube and the fixed tube are fixed by horizontal connecting rods and vertical connecting rods. When the drilling rig breaks the fixing ring and the fixing bolts, the central tube is decomposed from an integral structure into several separate structures. Compared with the existing integral metal structure bridge plug, the structural strength is greatly reduced, which facilitates the drilling rig to quickly drill through the bridge plug.

[0014] The fixed ring and support ring are composed of four arc-shaped assembly blocks. During the drilling process, the fixed ring and support ring are decomposed into block-shaped separate structures, which further improves the drilling speed of the drilling rig.

[0015] The front side of the sealing ring is provided with a forward-setting slope, and the rear end of the slip is placed on the slope of the sealing ring. When the slip is impacted forward by an external force pump, it is assisted by the slope to open quickly, thereby increasing the deployment and fixing speed of the slip. The sealing ring is a rubber sealing ring that expands when exposed to water, thereby improving the sealing effect of the bridge plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of the utility model;

[0017] Figure 2 This is a schematic structural diagram of the central tube of the utility model;

[0018] Figure 3 This is a schematic structural diagram of the support ring in the present utility model;

[0019] Figure 4 This is a schematic structural diagram of the bottom ring of the utility model;

[0020] Figure 5 This is a schematic structural diagram of the fixed pipe in the present utility model;

[0021] Figure 6 for Figure 5 Schematic diagram of the cross-sectional structure.

[0022] Fixed pipe 1, slip 2, fixed ring 3, support ring 4, bottom ring 5, horizontal connecting hole 6, vertical connecting hole 7, horizontal connecting rod 8, vertical connecting rod 9, sealing ring 10. DETAILED DESCRIPTION

[0023] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the embodiments described are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the utility model.

[0025] like Figures 1-6 As shown, an all-composite rapid-drilling bridge plug comprises a central tube and a fixed tube 1. The fixed tube 1 is located at the rear of the central tube and is equipped with a ring of slips 2. The central tube comprises a fixed ring 3, several support rings 4, and a bottom ring 5. Each of the fixed ring 3 and the support ring 4 has horizontal connecting holes 6 arranged in a front-to-rear direction. Each of the fixed ring 3, the support ring 4, and the bottom ring 5 also has vertical connecting holes 7 arranged in a top-to-bottom direction. The bottom ring 5 is equipped with two forward-facing horizontal connecting rods 8. The bottom ring 5 connects the support rings 4 and the fixed ring 3 in series via the two horizontal connecting rods 8 through the horizontal connecting holes 6 to form the central tube. The fixed tube 1 is equipped with two forward-facing vertical connecting rods 9. The fixed tube 1 connects the bottom ring 5, the support ring 4, and the fixed ring 3 in series via the two vertical connecting rods 9 through the vertical connecting holes 7 to form the bridge plug. Both the horizontal connecting rods 8 and the vertical connecting rods 9 are secured by bolts. The central tube adopts a modular design, and its length can be adjusted by adding or removing the number of support rings 4.

[0026] The fixing ring 3 and the supporting ring 4 are both composed of four arc-structured assembly blocks.

[0027] A sealing ring 10 is also provided on the fixed pipe 1 , and the sealing ring 10 is located at the rear side of the slip 2 .

[0028] The front side of the sealing ring 10 is provided with a forward-facing slope, and the rear end of the slip 2 is placed on the slope of the sealing ring 10 .

[0029] An adhesive seal is provided between the mating surfaces of the assembly blocks.

[0030] An adhesive sealing layer is provided between the fitting surfaces of the fixing ring 3 , the supporting ring 4 , the bottom ring 5 and the fixing pipe 1 .

[0031] The adhesive sealing layer is heat-resistant epoxy glue or inorganic high-temperature adhesive. Example

[0032] The assembly blocks of the support ring 4 are bonded into a complete circular ring by heat-resistant epoxy glue, ensuring that the fitting surfaces between the assembly blocks are tightly combined to form the support ring 4 as a whole; the assembly blocks of the fixing ring 3 are bonded into a complete circular ring in the same way to form the fixing ring 3 as a whole; the horizontal connecting rod 8 of the bottom ring 5 is passed through the horizontal connecting holes 6 on the support ring 4 and the fixing ring 3 in turn, and the three are fixedly connected by bolts to form the preliminary structure of the central pipe; the vertical connecting rod 9 of the fixed pipe 1 is passed through the vertical connecting holes 7 on the bottom ring 5, the support ring 4 and the fixing ring 3, and the fixed pipe 1 is tightly connected to the central pipe structure by bolts to form a complete bridge plug structure; the position of the slip 2 is adjusted so that its rear end is placed on the slope of the sealing ring 10 to ensure that the slip 2 can be quickly deployed and fixed when hit by an external force pump;

[0033] The assembled composite material rapid drilling bridge plug is sent to the specified well depth through pumping equipment; the setting pressure is applied to expand the slips 2 and make them close to the well wall. At the same time, the sealing ring 10 swells when it comes into contact with water, enhancing the sealing effect between the bridge plug and the well wall, and the ball is dropped to seal the central pipe; after the setting is completed, layered fracturing, oil testing or plugging operations are carried out; after the operation is completed, the bridge plug is drilled and ground using a drilling rig. The drilling rig first drills and breaks the fixing ring 3 and fixing bolts, and then the central pipe and fixed pipe 1 are gradually decomposed into several separate structures under the action of the drill bit, which facilitates rapid drilling.

[0034] The utility model adopts all-composite materials to manufacture the central pipe and the fixed pipe 1, and the slips 2 adopt ceramic materials. After the drilling rig drills and breaks the fixed structure, the bridge plug is quickly decomposed into several separate structures, thereby further improving the drilling and grinding efficiency.

[0035] The composite material used in the present invention is carbon fiber reinforced composite material (CFRP), polypropylene fiber or glass reinforced thermosetting plastic. The above materials are all existing conventional technologies, and their structural features will not be described in detail.

[0036] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A fully composite material rapid drilling bridge plug, characterized by: It includes a center pipe and a fixed pipe, the fixed pipe is located at the rear side of the center pipe, and a circle of slips is provided on the fixed pipe; the center pipe is composed of a fixed ring, several support rings and a bottom ring, and the fixed ring and the support ring are provided with horizontal connecting holes corresponding to the front and rear, and the fixed ring, the support ring and the bottom ring are also provided with vertical connecting holes corresponding to the upper and lower parts, and the bottom ring is provided with two horizontal connecting rods set forward, and the bottom ring is connected in series with the support ring and the fixed ring through the two horizontal connecting rods passing through the horizontal connecting holes to form the center pipe; the fixed pipe is provided with two vertical connecting rods set forward, and the fixed pipe is connected in series with the bottom ring, the support ring and the fixed ring through the two vertical connecting rods passing through the vertical connecting holes to form a bridge plug; the horizontal connecting rods and the vertical connecting rods are all fixed by bolts.

2. The all-composite rapid drilling bridge plug according to claim 1, characterized in that: The fixing ring and the supporting ring are both composed of four arc-structured assembly blocks.

3. The all-composite rapid drilling bridge plug according to claim 2, characterized in that: The fixed pipe is also provided with a sealing ring, which is located at the rear side of the slip.

4. The all-composite rapid drilling bridge plug according to claim 3, characterized in that: The front side of the sealing ring is provided with a forward-facing slope, and the rear end of the slip is placed on the slope of the sealing ring.

5. The all-composite rapid drilling bridge plug according to claim 4, characterized in that: An adhesive sealing layer is provided between the abutting surfaces of the assembly blocks.

6. The all-composite rapid drilling bridge plug according to claim 5, characterized in that: An adhesive sealing layer is provided between the fitting surfaces of the fixing ring, the supporting ring, the bottom ring and the fixing tube.

7. The all-composite rapid drilling bridge plug according to claim 6, characterized in that: The adhesive sealing layer is heat-resistant epoxy glue or inorganic high-temperature adhesive.

Images