Fracturing pitching sliding sleeve

Abstract

The utility model relates to the technical field of oil exploitation, in particular to a fracturing pitching sliding sleeve. The fracturing pitching sliding sleeve comprises a sleeve, a positioning ring in sliding connection is installed in the sleeve, multiple sets of annularly-distributed clamping parts are installed on the positioning ring, and a plugging sleeve and a ball seat sleeve are installed at the bottom of the positioning ring. According to the fracturing pitching sliding sleeve, the conical intercepting structure composed of the multiple inclined pressing plates can guide the pressure building ball to accurately fall to the center position, blocking is avoided, meanwhile, the inclination angle design of the inclined pressing plates enables the fluctuation range of a triggering pressure threshold value to be effectively controlled, therefore, the fracturing pitching sliding sleeve meets the pressure requirements of different reservoirs, the triggering success rate is increased, and the safety coefficient is increased. And after the inserting rod completely slides away from the limiting hole, the positioning ring slides down along the sliding groove along with the protruding sliding frame, the pressure building ball penetrates through the conical intercepting structure and falls onto the ball seat sleeve, and at the moment, the plugging sleeve slides down and enables the sand blasting hole to be exposed.

Description

Technical Field

[0001] This utility model relates to the field of oil extraction technology, and in particular to a fracturing ball-throwing sliding sleeve. Background Technology

[0002] In the petroleum industry, fracturing refers to a method of creating fractures in oil and gas reservoirs using hydraulic force during oil or gas production; it is also known as hydraulic fracturing. Fracturing artificially creates fractures in the formation, improving the underground flow environment for oil and increasing well production. It plays an important role in improving bottomhole flow conditions, mitigating inter-layer fracturing, and improving reservoir dynamics. For most casing cementing wells, staged fracturing is required, such as ball-dropped sliding sleeve staged fracturing. This method is achieved using tools such as ball-dropped sliding sleeve fracturing devices, open-hole packers, and fracturing balls. Different sized fracturing balls are dropped from the wellhead in stages. Once the fracturing balls reach the ball seat position of the sliding sleeve, the corresponding sliding sleeve is opened, and fracturing is performed on that layer, ultimately achieving multi-stage fracturing.

[0003] Traditional ball-type sliding sleeves use shear pins to fix the sleeve. When the fracturing pressure is reached, the pins in that layer are crushed, and the sleeve moves down instantly, exposing the sandblasting holes that were originally covered by the sleeve, thus enabling fracturing operations on that layer. In this structure, the downward movement of the sleeve depends on whether the pins can be crushed. However, the pressure required to crush the pins is difficult to design as a fixed value because it is affected by many factors, such as differences in pin materials, molding processes, pin installation angles, the size of the installation holes, and the location of the stress point during fracturing. These factors cannot be kept completely consistent during construction. As a result, the crushing pressure varies greatly when the same equipment is used for different fracturing operations. This is obviously not conducive to the control of the construction, such as the prediction of the amount of flushing water. It may also lead to situations where the low pressure opens too early or the high pressure fails to open.

[0004] Therefore, it is necessary to provide a new fracturing ball-throwing sleeve to solve the above-mentioned technical problems. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a fracturing ball throwing slide.

[0006] The fracturing ball-throwing sleeve provided by this utility model includes a sleeve, the inner wall of which is provided with multiple annularly distributed and axially arranged sliding grooves, the sleeve above the sliding grooves is provided with multiple annularly distributed limiting holes, and the sleeve below the sliding grooves is provided with multiple annularly distributed sandblasting holes.

[0007] The sleeve is equipped with a slidingly connected positioning ring, and the positioning ring is equipped with multiple sets of ring-shaped snap-fit ​​components. The snap-fit ​​components include a collar, on which an upper connecting plate and an inclined pressure plate are fixedly installed. The upper connecting plate and the inclined pressure plate are V-shaped. An insertion rod is fixedly installed on the outer wall of the upper connecting plate near the top, and the insertion rod is inserted into the corresponding limiting hole.

[0008] The bottom of the positioning ring is fitted with a sealing sleeve and a ball seat sleeve.

[0009] Preferably, the outer ring wall of the positioning ring is fixedly equipped with a plurality of annularly distributed protruding sliding frames, and the protruding sliding frames are inserted into the sliding grooves opened in the sleeve and slidably connected to the sliding grooves.

[0010] Preferably, a connecting rod is fixedly installed inside the raised sliding frame, and a damping sleeve is fixedly connected to the connecting rod, with the collar sleeved on the damping sleeve in the connecting rod.

[0011] Preferably, the angle between the upper plate and the vertical line is smaller than the angle between the inclined pressure plate and the vertical line.

[0012] Preferably, a central arc plate is fixedly installed at the bottom of the positioning ring, and an intermittent groove is left between two adjacent central arc plates. The inclined pressure plate is inserted into the corresponding intermittent groove and slidably connected to the intermittent groove.

[0013] Preferably, the sealing sleeve is fixedly installed at the bottom of the central arc plate, and the ball seat sleeve is fixedly installed at the bottom of the sealing sleeve.

[0014] Preferably, connectors are fixedly installed at both the upper and lower ends of the sleeve.

[0015] Compared with related technologies, the fracturing ball-throwing slide provided by this utility model has the following beneficial effects:

[0016] In this invention, the conical interception structure composed of multiple inclined pressure plates can guide the pressure-holding ball to fall precisely to the center position, avoiding jamming. At the same time, the tilt angle design of the inclined pressure plates can effectively control the fluctuation range of the trigger pressure threshold, thus adapting to different reservoir pressure requirements and improving the trigger success rate. When the insertion rod completely slides away from the limiting hole, the positioning ring slides down the slide groove along the raised sliding frame, and the pressure-holding ball passes through the conical interception structure and falls onto the ball seat sleeve. At this time, the sealing sleeve slides down and exposes the sandblasting hole. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the fracturing ball-throwing sliding sleeve provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows a cross-sectional view of the sleeve and a schematic diagram of the installation structure of the positioning ring inside the sleeve.

[0019] Figure 3 for Figure 2 The diagram shows the structure of the sleeve.

[0020] Figure 4 for Figure 2 A schematic diagram of the installation structure of the snap-fit ​​component on the positioning ring shown;

[0021] Figure 5 for Figure 4 A cross-sectional view of the positioning ring shown.

[0022] Figure 6 for Figure 5 The diagram shows the structure of the snap-fit ​​component.

[0023] The following are the labels in the diagram: 1. Sleeve; 1a. Slide groove; 1b. Limiting hole; 1c. Sandblasting hole; 11. Connector; 2. Positioning ring; 21. Protruding slide frame; 22. Sleeve rod; 3. Snap-fit ​​component; 31. Collar; 32. Upper connecting plate; 33. Inclined pressure plate; 34. Insertion rod; 4. Central connecting arc plate; 5. Sealing sleeve; 6. Ball seat sleeve. 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] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 6 The present invention provides a fracturing ball-throwing slide sleeve, which includes a sleeve 1, a positioning ring 2, and a snap-fit ​​component 3.

[0027] In the embodiments of this utility model, please refer to Figures 1 to 6 The inner wall of the sleeve 1 has multiple annularly distributed and axially arranged sliding grooves 1a. The sleeve 1 above the sliding grooves 1a has multiple annularly distributed limiting holes 1b, and the sleeve 1 below the sliding grooves 1a has multiple annularly distributed sandblasting holes 1c.

[0028] A slidably connected positioning ring 2 is installed inside the sleeve 1, and multiple sets of annularly distributed snap-fit ​​components 3 are installed on the positioning ring 2. Specifically, multiple annularly distributed protruding slide frames 21 are fixedly installed on the outer ring wall of the positioning ring 2, and the protruding slide frames 21 are inserted into the slide groove 1a opened in the sleeve 1 and slidably connected to the slide groove 1a. The snap-fit ​​component 3 includes a collar 31, on which upper connecting plates 32 and inclined pressure plates 33 are fixedly installed, and the upper connecting plates 32 and inclined pressure plates 33 are V-shaped. An insertion rod 34 is fixedly installed on the outer wall of the upper connecting plate 32 near the top, and the insertion rod 34 is inserted into the corresponding limiting hole 1b. A connecting rod 22 is fixedly installed inside the protruding slide frame 21, and a damping sleeve is fixedly connected on the connecting rod 22. The collar 31 is fitted on the damping sleeve in the connecting rod 22.

[0029] The bottom of the positioning ring 2 is equipped with a sealing sleeve 5 and a ball seat sleeve 6. Specifically, the sealing sleeve 5 is fixedly installed at the bottom of the central arc plate 4, while the ball seat sleeve 6 is fixedly installed at the bottom of the sealing sleeve 5.

[0030] It should be noted that in the initial state, the insertion rods 34 in the snap-fit ​​component 3 are inserted into the corresponding limiting holes 1b. Since the sleeve rod 22 is equipped with a damping sleeve, it can prevent the insertion rods 34 from accidentally coming out of the limiting holes 1b due to vibration or impact. Therefore, after the insertion rods 34 are inserted into the limiting holes 1b, the inclined pressure plate 33 below tilts towards the axis of the sleeve 1 and forms a conical interception structure to intercept the pressure-stabilized ball. At this time, the positioning ring 2, the sealing sleeve 5 below, and the ball seat sleeve 6 can be stably installed in the sleeve 1. The sealing sleeve 5 corresponds to the sandblasting hole 1c, thereby sealing the sandblasting hole 1c. The conical interception structure can guide the pressure-stabilized ball to fall accurately to the center position and avoid jamming. At the same time, the tilt angle design of the inclined pressure plate 33 can effectively control the fluctuation range of the trigger pressure threshold, thus adapting to different reservoir pressure requirements and improving the trigger success rate.

[0031] During fracturing, a pressure-absorbing ball is inserted into sleeve 1, and the ball falls onto a conical interception structure composed of multiple inclined pressure plates 3 (as shown in the attached diagram). Figure 2 As shown), by applying pressure to the sleeve 1, the pressure ball slides down the conical interception structure and opens the inclined pressure plate 33. At this time, the inclined pressure plate 33 rotates away from the axis of the sleeve 1. Therefore, the inclined pressure plate 33 rotates towards the axis of the sleeve 1 under the drive of the inclined pressure plate 33. At the same time, the insertion rod 34 gradually slides away from the limiting hole 1b. When the insertion rod 34 completely slides away from the limiting hole 1b, the positioning ring 2 slides down along the slide groove 1a with the protruding slide frame 21, and the pressure ball passes through the conical interception structure and falls onto the ball seat sleeve 6. At the same time, the sealing sleeve 5 slides down and exposes the sandblasting hole 1c.

[0032] In this embodiment, in order to allow spot welding fixation between the collar 31 and the connecting rod 22, the collar 31 can rotate around the connecting rod 22 after the weld point between the collar 31 and the connecting rod 22 is crushed.

[0033] The angle between the upper plate 32 and the vertical line is smaller than the angle between the inclined pressure plate 33 and the vertical line, so that the pressure ball can fall onto the cone-shaped interception structure composed of multiple inclined pressure plates 3.

[0034] Furthermore, a central arc plate 4 is fixedly installed at the bottom of the positioning ring 2, and an intermittent groove is left between two adjacent central arc plates 4. The inclined pressure plate 33 is inserted into the corresponding intermittent groove and slidably connected to the intermittent groove to avoid the central arc plate 4 from obstructing the deflection of the inclined pressure plate 33.

[0035] Furthermore, connectors 11 are fixedly installed at both the upper and lower ends of the sleeve 1 to facilitate the connection of pipe fittings.

[0036] In addition, the damping sleeve in this application adopts a metal elastic damping sleeve (such as a stainless steel wave spring damping sleeve). The temperature resistance range of the metal material can reach -50 to 300℃. There is no aging problem in the high temperature environment of deep wells. The damping force is maintained for 5-8 times longer than that of traditional rubber damping sleeves. An annular groove can be opened on the outer surface of the metal damping sleeve, and a high temperature resistant graphite lubricating layer can be built in it to reduce the friction coefficient between the collar 31 and the damping sleeve, avoid the collar 31 from getting stuck, and at the same time improve the impact resistance of the damping sleeve, making it suitable for ultra-deep well environments.

[0037] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0038] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A fracturing ball-throwing sliding sleeve, characterized in that, Includes a sleeve (1), the inner wall of the sleeve (1) has multiple annularly distributed and axially arranged sliding grooves (1a), the sleeve (1) above the sliding grooves (1a) has multiple annularly distributed limiting holes (1b), and the sleeve (1) below the sliding grooves (1a) has multiple annularly distributed sandblasting holes (1c). The sleeve (1) is equipped with a slidingly connected positioning ring (2), and the positioning ring (2) is equipped with multiple sets of ring-shaped snap-fit ​​components (3). The snap-fit ​​component (3) includes a collar (31), and the collar (31) is fixedly equipped with an upper connecting plate (32) and an inclined pressure plate (33) distributed vertically. The upper connecting plate (32) and the inclined pressure plate (33) are V-shaped. An insertion rod (34) is fixedly installed on the outer wall of the upper connecting plate (32) near the top, and the insertion rod (34) is inserted into the corresponding limiting hole (1b). The bottom of the positioning ring (2) is fitted with a sealing sleeve (5) and a ball seat sleeve (6).

2. The fracturing ball-throwing sliding sleeve according to claim 1, characterized in that, The outer ring wall of the positioning ring (2) is fixedly installed with a plurality of annularly distributed protruding slide frames (21), and the protruding slide frames (21) are inserted into the slide groove (1a) opened in the sleeve (1) and slidably connected to the slide groove (1a).

3. The fracturing ball-throwing sliding sleeve according to claim 2, characterized in that, A sleeve rod (22) is fixedly installed inside the raised sliding frame (21), and a damping sleeve is fixedly connected on the sleeve rod (22). The collar (31) is sleeved on the damping sleeve in the sleeve rod (22).

4. The fracturing ball-throwing sliding sleeve according to claim 1, characterized in that, The angle between the upper plate (32) and the vertical line is smaller than the angle between the inclined pressure plate (33) and the vertical line.

5. The fracturing ball-throwing sliding sleeve according to claim 1, characterized in that, The bottom of the positioning ring (2) is fixedly installed with a central arc plate (4), and an intermittent groove is left between two adjacent central arc plates (4). The inclined pressure plate (33) is inserted into the corresponding intermittent groove and slidably connected to the intermittent groove.

6. The fracturing ball-throwing sliding sleeve according to claim 1, characterized in that, The sealing sleeve (5) is fixedly installed at the bottom of the central arc plate (4), and the ball seat sleeve (6) is fixedly installed at the bottom of the sealing sleeve (5).

7. The fracturing ball-throwing sliding sleeve according to claim 1, characterized in that, Both ends of the sleeve (1) are fixedly installed with connectors (11).

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