A rapid drilling bridge plug

Abstract

The utility model discloses a quick drilling bridge plug relates to oilfield injection well down tool technical field, including device casing, the outer wall of device casing is provided with the protection sleeve, and the inner wall of protection sleeve is provided with the connecting pipe, the inner wall of connecting pipe is provided with the positioning ring, and the bottom of positioning ring is provided with the sealed groove, the top of sealed groove places the steel ball, and the steel ball is attached with the center hole, the inner wall of connecting pipe is provided with the cavity, and the lower extreme of cavity is provided with the internal thread. The utility model discloses through the setting of positioning ring, sealed groove, sealed groove is conical shape, and positioning ring, sealed groove have carried out effective location to the position of steel ball, make steel ball periphery gap smaller, and then improved the effect of device plugging, through the setting of connecting pipe, connecting pipe sets up in the outer wall of positioning ring, and the cavity is set up in connecting pipe, and the working pipe is installed between positioning ring, connecting pipe, and effectively improved the stability of device in the operation process.

Description

Technical Field

[0001] This utility model relates to the field of downhole tools for water injection in oil fields, specifically a fast-drilling bridge plug. Background Technology

[0002] The fast-drilling bridge plug is a downhole tool specifically designed for staged fracturing of unconventional oil and gas reservoirs (such as shale gas and tight oil). Its core feature is rapid drilling and grinding. Through material and structural innovation, it solves the problems of time-consuming drilling and grinding and high risk of stuck pipe in traditional bridge plugs, significantly improving the efficiency of fracturing operations.

[0003] The fast-drilling bridge plug is precisely positioned to the target formation by being lowered under pressure using a cable or coiled tubing. A hydraulically driven cone opens the slips to anchor the inner wall of the casing and compresses the high-temperature resistant rubber sleeve to achieve a seal, dividing the wellbore into independent fracturing sections. After fracturing, its composite material body can be quickly drilled (completed within minutes) or the soluble material can dissolve on its own (without drilling), ultimately forming a full-bore wellbore. It efficiently adapts to the entire process of "isolation-construction-clearing" in unconventional oil and gas staged fracturing.

[0004] In the operation of fast drilling bridge plugs, steel balls are placed inside the device. The steel balls are located at the upper end of the central tube of the bridge plug. When pressure is applied, the steel balls are pressed into the sealing groove to seal the central hole. After the steel balls are sealed, the pressure pushes the piston down, squeezing the slips into the sleeve. At the same time, the rubber sleeve expands to adhere to the wall. However, the existing sealing groove has a large gap around it, which can easily cause the steel balls to shake, thus reducing the sealing effect. Utility Model Content

[0005] Therefore, the purpose of this utility model is to provide a fast drilling bridge plug to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fast drilling bridge plug, comprising a device housing, a protective sleeve provided on the outer wall of the device housing, a connecting tube provided on the inner wall of the protective sleeve, a positioning ring provided on the inner wall of the connecting tube, a sealing groove provided at the bottom of the positioning ring, a steel ball placed on the top of the sealing groove, the steel ball fitting into the central hole, a cavity provided on the inner wall of the connecting tube, and an internal thread provided at the lower end of the cavity.

[0007] By adopting the above technical solution, the positioning ring and sealing groove are set. The sealing groove is conical in shape, and the positioning ring and sealing groove effectively limit the position of the steel ball, making the gap around the steel ball smaller, thereby improving the sealing effect of the device. The connecting pipe is set on the outer wall of the positioning ring, and a cavity is set inside the connecting pipe. A working pipe is installed between the positioning ring and the connecting pipe, which effectively improves the stability of the device during operation, and the positioning ring also effectively protects the working pipe.

[0008] The present invention is further configured such that one end of the device housing is connected to a working tube, and one end of the working tube is threadedly connected to the inner wall of the cavity.

[0009] Preferably, the working tube is threaded to the inner wall of the cavity, and the working tube is located on top of the protrusion, which effectively limits the position of the working tube and improves the stability when the working tube is connected to the device.

[0010] The present invention is further configured such that the outer wall of the positioning ring is provided with a protrusion, and the protrusion is located between the positioning ring and the cavity, and the top of the protrusion is in contact with the working tube.

[0011] Preferably, the protrusion effectively limits and protects the position of the working tube, making it easier for workers to install the working tube and improving the stability when the working tube is connected to the device.

[0012] The present invention is further configured such that the bottom of the positioning ring is provided with a through hole, and the diameter of the through hole is larger than the diameter of the steel ball.

[0013] Preferably, the through hole limits the position of the steel ball while also facilitating its passage, thereby improving the stability of the steel ball when it falls into the top of the sealing groove and reducing its shaking.

[0014] The present invention is further configured such that the cross-section of the sealing groove is conical, and the inner wall of the sealing groove is provided with a central hole.

[0015] Preferably, the shape of the sealing groove is designed to minimize the gaps around the steel ball, thus greatly reducing the wobbling of the steel ball.

[0016] The present invention is further configured such that a steel ball is placed on the top of the central hole, and the diameter of the central hole is smaller than the diameter of the steel ball.

[0017] Preferably, this method effectively improves the sealing effect of the steel ball, making it easier for the pressure to push the piston down after the steel ball is sealed, squeezing the slips into the sleeve, while the rubber sleeve expands to adhere to the wall.

[0018] The present invention is further provided that the outer wall of the sealing groove is provided with a placement platform, and a positioning ring is installed on the top of the placement platform.

[0019] Preferably, this effectively limits the movement of the steel ball while improving the stability of the positioning ring installation.

[0020] The present invention is further configured such that the top of the positioning ring is provided with multiple sets of grooves, and the multiple sets of grooves are arranged opposite to each other.

[0021] Preferably, multiple sets of grooves are provided to facilitate the observation of the working tube being inserted into the device by the staff.

[0022] In summary, the present invention has the following main advantages: 1. This utility model, through the setting of positioning ring and sealing groove, the sealing groove is conical in shape, and the positioning ring and sealing groove effectively limit the position of the steel ball, so that the gap around the steel ball is smaller, thereby improving the sealing effect of the device.

[0023] 2. This utility model improves the stability of the device during operation by setting a connecting pipe, which is located on the outer wall of the positioning ring and has a cavity inside. A working pipe is installed between the positioning ring and the connecting pipe, and the positioning ring also provides effective protection for the working pipe. Attached Figure Description

[0024] Figure 1 This is a front perspective view of the present utility model; Figure 2 This is a schematic diagram showing the position of the steel ball in this utility model; Figure 3 This is a schematic diagram showing the positions of the positioning ring and sealing groove of this utility model; Figure 4 This is a schematic diagram of the positioning ring mechanism of this utility model.

[0025] Explanation of reference numerals in the attached figures: 1. Device housing; 2. Protective sleeve; 3. Connecting pipe; 4. Positioning ring; 5. Sealing groove; 6. Center hole; 7. Cavity; 8. Steel ball; 9. Protrusion; 10. Groove; 11. Through hole; 12. Placement platform. Detailed Implementation

[0026] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0027] The embodiments of this utility model will be described below based on its overall structure.

[0028] First embodiment: Please see Figures 1-4The device includes a housing 1, with a protective sleeve 2 on the outer wall of the housing 1. A connecting pipe 3 is located on the inner wall of the protective sleeve 2. A positioning ring 4 is located on the inner wall of the connecting pipe 3, and a sealing groove 5 is located at the bottom of the positioning ring 4. A steel ball 8 is placed on the top of the sealing groove 5, and the steel ball 8 fits into the central hole 6. A cavity 7 is located on the inner wall of the connecting pipe 3, and an internal thread is provided at the lower end of the cavity 7. Through the positioning ring 4 and the sealing groove 5, the sealing groove 5 is conical in shape, and the positioning ring 4 and the sealing groove 5 effectively limit the position of the steel ball 8, resulting in smaller gaps around the steel ball 8 and thus improving the sealing effect of the device. The connecting pipe 3 is located on the outer wall of the positioning ring 4, and a cavity 7 is provided inside the connecting pipe 3. A working pipe is installed between the positioning ring 4 and the connecting pipe 3, effectively improving the stability of the device during operation, and the positioning ring 4 also effectively protects the working pipe.

[0029] For details regarding the above embodiments, please refer to [link / reference]. Figure 1 , Figure 2 One end of the device housing 1 is connected to a working tube, and one end of the working tube is threaded to the inner wall of the cavity 7. The working tube is threaded to the inner wall of the cavity 7 and is located on the top of the protrusion 9, which effectively limits the position of the working tube and improves the stability when the working tube is connected to the device.

[0030] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4 The outer wall of the positioning ring 4 is provided with a protrusion 9, which is located between the positioning ring 4 and the cavity 7. The top of the protrusion 9 is in contact with the working tube. The protrusion 9 effectively limits and protects the position of the working tube, making it easier for the staff to install the working tube and improving the stability when the working tube is connected to the device.

[0031] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4 The bottom of the positioning ring 4 is provided with a through hole 11, and the diameter of the through hole 11 is larger than the diameter of the steel ball 8. The through hole 11 limits the position of the steel ball 8 while also facilitating the passage of the steel ball 8, thereby improving the stability of the steel ball 8 when it falls into the top of the sealing groove 5 and reducing the shaking of the steel ball 8.

[0032] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-3 The sealing groove 5 has a conical cross-section and a central hole 6 is provided on the inner wall of the sealing groove 5. The shape of the sealing groove 5 makes the gap around the steel ball 8 smaller, which greatly reduces the shaking of the steel ball 8.

[0033] For details regarding the above embodiments, please refer to [link / reference]. Figures 1-4A steel ball 8 is placed on top of the central hole 6, and the diameter of the central hole 6 is smaller than the diameter of the steel ball 8. The steel ball 8 is located on top of the central hole 6, which effectively improves the sealing effect of the steel ball 8. After the steel ball 8 seals, the pressure pushes the piston down, squeezes the slip into the sleeve, and at the same time the rubber sleeve expands to adhere to the wall.

[0034] Second embodiment: Please see Figure 4 The difference between Embodiment 2 and Embodiment 1 is that, while retaining the features of Embodiment 1, a placement platform 12 is provided on the top of the sealing groove 5, and a positioning ring 4 is installed on the top of the placement platform 12, which improves the stability of the positioning ring 4.

[0035] A placement platform 12 is provided around the sealing groove 5, and a positioning ring 4 is installed on the top of the placement platform 12. The positioning ring 4 fits against the top of the sealing groove 5, and the positioning ring 4 does not contact the steel ball 8. This effectively limits the steel ball 8 while improving the stability of the positioning ring 4 installation, thereby improving the stability of the working tube installation cavity 7.

[0036] In practical operation, this utility model is as follows: During the rapid drilling bridge plug operation, steel balls 8 are placed inside the device. The steel balls 8 are located at the upper end of the central hole 6 of the bridge plug. When pressure is applied, the steel balls 8 are pressed into the conical sealing groove 5 to seal the central hole 6. The shape of the sealing groove 5 makes the gap around the steel balls 8 smaller, which greatly reduces the shaking of the steel balls 8 and thus improves the sealing effect. After the steel balls 8 are sealed, the pressure pushes the piston down, squeezing the slips into the sleeve, while the rubber sleeve expands to adhere to the wall. Furthermore, a positioning ring 4 is placed on the top of the sealing groove 5, and a protrusion 9 is provided between the positioning ring 4 and the cavity 7. The working tube is threadedly connected to the inner wall of the cavity 7, and the working tube is located on the top of the protrusion 9, which effectively limits the position of the working tube and improves the stability when the working tube is connected to the device.

[0037] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A fast drilling bridge plug, comprising a device housing (1), characterized in that: The outer wall of the device housing (1) is provided with a protective sleeve (2), and the inner wall of the protective sleeve (2) is provided with a connecting pipe (3). The inner wall of the connecting pipe (3) is provided with a positioning ring (4), and the bottom of the positioning ring (4) is provided with a sealing groove (5). A steel ball (8) is placed on the top of the sealing groove (5), and the steel ball (8) fits into the center hole (6). The inner wall of the connecting pipe (3) is provided with a cavity (7), and the lower end of the cavity (7) is provided with an internal thread.

2. The fast drilling bridge plug according to claim 1, characterized in that: One end of the device housing (1) is connected to a working tube, and one end of the working tube is threaded to the inner wall of the cavity (7).

3. The fast drilling bridge plug according to claim 1, characterized in that: The outer wall of the positioning ring (4) is provided with a protrusion (9), and the protrusion (9) is located between the positioning ring (4) and the cavity (7), and the top of the protrusion (9) is in contact with the working tube.

4. The fast drilling bridge plug according to claim 1, characterized in that: The bottom of the positioning ring (4) is provided with a through hole (11), and the diameter of the through hole (11) is larger than the diameter of the steel ball (8).

5. A fast drilling bridge plug according to claim 1, characterized in that: The sealing groove (5) has a conical cross-section, and the inner wall of the sealing groove (5) is provided with a central hole (6).

6. A fast drilling bridge plug according to claim 1, characterized in that: A steel ball (8) is placed on top of the central hole (6), and the diameter of the central hole (6) is smaller than the diameter of the steel ball (8).

7. A fast drilling bridge plug according to claim 1, characterized in that: The outer wall of the sealing groove (5) is provided with a placement platform (12), and a positioning ring (4) is installed on the top of the placement platform (12).

8. A fast drilling bridge plug according to claim 1, characterized in that: The top of the positioning ring (4) is provided with multiple sets of grooves (10), and the multiple sets of grooves (10) are arranged opposite to each other.

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