A rubber dual channel uniform expansion packer with distributed barriers for fracturing

Abstract

The application provides a rubber double-channel uniform expansion type packer with distributed partition plates for fracturing, which comprises expansion rubber and an inner support pipe, two sealing rings are symmetrically arranged at both ends of the expansion rubber, two threaded fixing pipes are arranged on one side of the two sealing rings, two pressing fixing mechanisms are arranged on one side of the two threaded fixing pipes, eight outer partition plates are uniformly arranged outside the expansion rubber, and the inner pipe of the inner layer of the expansion rubber is designed to be opened and closed by springs, so that the fracturing fluid can contact the expansion rubber in the pipe and outside the pipe at the same time. The self-expansion rubber of the application is designed to be expanded at the same time by double-face contact with the fracturing fluid, and is installed in cooperation with the distributed partition plates, so that the expansion uniformity of the self-expansion rubber is improved, the stability of installation is improved by adopting inner and outer double-threaded fixing through the installation of the pressing fixing mechanisms, and the sealing effect is improved by the installation of the sealing ring and the sealing pressing ring.

Description

Technical Field

[0001] This invention relates to the field of packer technology, and more specifically, to a rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing. Background Technology

[0002] Packers are common industrial devices used to control fluid flow in pipelines, achieving fluid containment and diversion. Their working principle is based on fluid mechanics and valve control technology. Through reasonable structural design and precise control, they ensure the safe and stable operation of pipeline systems. Rubber packers achieve setting by inflating the rubber sleeve, causing the rubber to expand and contact the inner wall of the well casing; depressurizing the rubber sleeve causes it to contract, thus releasing the seal. Metal packers achieve setting by using a metal with high expansion capacity, and release the seal by the contraction of the metal.

[0003] While existing packers are technically advanced, they still have certain shortcomings. For example, one type of packer includes an annular sleeve, two cups, and two retaining rings. The two cups are fitted onto both ends of the annular sleeve, and the sealing performance of the packer is mainly ensured by the added cup structure. However, this packer has certain defects. First, the surface of the annular sleeve is smooth, and the surface of the self-expanding rubber section of the existing rubber uniform expansion packer is also designed to be smooth. This results in a large contact area with the inner wall of the wellbore, low pressure, and poor structural strength. In addition, the rubber section of the existing rubber uniform expansion packer is fixed to the sealing seat by a single-sided thread, resulting in poor installation sealing and leakage. Summary of the Invention

[0004] The purpose of this invention is to overcome at least one of the aforementioned deficiencies in the prior art. For example, the purpose of this invention is to provide a rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing.

[0005] To achieve the above objectives, the present invention provides a rubber dual-channel uniform expansion packer with distributed partitions for fracturing. The packer includes an expansion rubber and an inner support tube. Each end of the expansion rubber is equipped with a sealing ring, and a threaded fixing tube is installed on the outward side of each of the two sealing rings. A clamping and fixing mechanism is installed on one side of each of the two threaded fixing tubes.

[0006] The inner support tube is disposed inside the expanding rubber. The inner support tube includes a tube body, and the two ends of the tube body are respectively connected to the sealing rings at both ends of the expanding rubber. The body of the tube body has multiple openings that pass through the inside and outside. The body of the tube body is also provided with several elastic opening and closing mechanisms, and each elastic opening mechanism covers at least one opening.

[0007] Alternatively, the outer surface of the tube may be provided with multiple grooves.

[0008] Alternatively, the elastic opening and closing mechanism includes: a push plate, with rotating plates hinged to both ends of the inner surface of the push plate, the end of the rotating plate opposite to the push plate being hinged to a sliding block, the sliding block being installed in a slide groove and also connected to an auxiliary spring, the auxiliary spring being installed in the slide groove.

[0009] The push plate opens when it is subjected to pressure from the inner surface, and the pressure fluid contacts the inner surface of the expanded rubber through the inner channel.

[0010] Alternatively, the number of the elastic opening and closing mechanisms may be multiple, and they may be evenly distributed along the axial direction of the tube.

[0011] Alternatively, two support rings are fixedly connected to the inner wall of the tube, with the two support rings corresponding to the two ends of the elastic opening and closing mechanism, respectively.

[0012] Alternatively, multiple outer partitions are evenly installed on the outer circumference of the expanded rubber. The outer partitions improve the expansion uniformity of the expanded rubber and prevent uneven axial contact pressure between the rubber and the well wall.

[0013] Optionally, the clamping and fixing mechanism includes an external threaded tube, a sealing ring, a sealing clamping ring, a mounting groove, a movable threaded tube, and a threaded fixing section. The inner circumference of the two threaded fixing tubes is fixed with two threaded fixing sections by threads. Two external threaded tubes are installed on one side of each of the two threaded fixing sections. A first connecting section and a second connecting section are respectively installed at one end of each of the two external threaded tubes.

[0014] Alternatively, two movable threaded tubes may be sleeved around the two externally threaded tubes and connected by threaded engagement.

[0015] Alternatively, two mounting grooves are provided on one side of the interior of each of the two movable threaded tubes, and two sealing compression rings are installed on one side of the interior of each of the two mounting grooves. The two sealing compression rings are pressed and fixed to one side of the outer circumference of the two threaded fixed tubes, and two sealing rings are installed on the inner edge of the two sealing compression rings.

[0016] Optionally, a first connector is installed on one side of the first connecting segment, and a threaded connecting pipe is installed on one side of the first connector. A first connecting hole is opened at the center of the first connector, the threaded connecting pipe and the first connecting segment.

[0017] Alternatively, a second connector is installed on one side of the second connecting section, and an internal threaded connection hole is provided on one side of the second connector.

[0018] Compared with the prior art, the beneficial effects of the present invention include at least one of the following:

[0019] (1) The self-expanding rubber of the present invention adopts a dual-channel design for fracturing fluid. With the installation of distributed baffles, the contact area between the self-expanding rubber and the fracturing fluid is increased, the expansion uniformity is improved, and the sealing effect is enhanced. Furthermore, the installation of the clamping and fixing mechanism, which uses internal and external double threads for fixing, improves the stability of the installation. Combined with the installation of the sealing ring and the sealing clamping ring, the sealing effect is improved.

[0020] (2) The present invention improves the stability of installation by using internal and external double thread fixing through the installation of the clamping and fixing mechanism, and improves the sealing effect by cooperating with the installation of the sealing ring and the sealing clamping ring. Attached Figure Description

[0021] The above and other objects and / or features of the present invention will become clearer from the following description taken in conjunction with the accompanying drawings, in which:

[0022] Figure 1 A perspective view of the overall structure of the expansion packer of the present invention is shown;

[0023] Figure 2 A front view of the overall structure of the expansion packer of the present invention is shown;

[0024] Figure 3 A front sectional view of the overall structure of the expansion packer of the present invention is shown;

[0025] Figure 4 It shows Figure 3 Enlarged view of region A in the middle;

[0026] Figure 5 A side view of the inner support tube of the expansion packer of the present invention is shown;

[0027] Figure 6 A diagram showing the internal structure of the inner support tube of the expansion packer of the present invention is provided.

[0028] Figure 7 It shows Figure 6 Enlarged view of region B in the middle;

[0029] Figure 8 It shows Figure 3 Enlarged schematic diagram of region C in the middle.

[0030] Explanation of key figure labels:

[0031] 1. Expanding rubber; 2. First joint; 3. Threaded connecting pipe; 4. First connecting section; 5. Outer partition; 6. Second connecting section; 7. Second joint; 8. Pressing and fixing mechanism; 9. Sealing ring; 10. First connecting hole; 11. Center hole; 12. Internal threaded connecting hole; 13. Threaded fixing pipe; 14. Inner support pipe;

[0032] 801. Externally threaded pipe; 802. Sealing ring; 803. Sealing clamping ring; 804. Mounting groove; 805. Movable threaded pipe; 806. Threaded fixed section;

[0033] 1401. Tube body; 1402. Push plate; 1403. Rotating plate; 1404. Sliding block; 1405. Auxiliary spring; 1406. Support ring. Detailed Implementation

[0034] In the following description, a rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing will be explained in detail with reference to exemplary embodiments.

[0035] It should be noted that terms such as "first," "second," "third," and "fourth" are merely for ease of description and distinction, and should not be interpreted as indicating or implying relative importance. Terms such as "up," "down," "front," "back," "left," "right," "inner," and "outer" are merely for ease of description and to establish relative orientations or positional relationships, and do not indicate or imply that the component referred to must have that specific orientation or position.

[0036] Exemplary embodiments

[0037] This exemplary embodiment will be combined with the appendix Figure 1-8 The following describes a rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing.

[0038] Figure 1 and Figure 2 The diagram shows the overall structure of the expansion packer of the present invention from different perspectives. Figure 3 A front sectional view of the overall structure is shown. Figure 5 A side view of the inner support tube is shown. Figure 6 The diagram shows the internal structure of the inner support tube. Figure 4 and Figure 8 They are shown respectively Figure 3 Enlarged diagrams of regions A and C in the middle. Figure 7 It shows Figure 6 A magnified view of region B in the middle section. The following will be combined with... Figures 1 to 8 Let me explain.

[0039] In this embodiment, the rubber dual-channel uniform expansion packer with distributed partition for fracturing includes an expansion rubber 1 and an inner support tube 14. Each end of the expansion rubber 1 is equipped with a sealing ring 9, and a threaded fixing tube 13 is installed on the outward side of each of the two sealing rings 9. A clamping and fixing mechanism 8 is installed on one side of each of the two threaded fixing tubes 13.

[0040] The inner support tube 14 is disposed inside the expansion rubber 1. The inner support tube 14 includes a tube body 1401. The two ends of the tube body 1401 are respectively connected to the sealing rings 9 at both ends of the expansion rubber 1. The body of the tube body 1401 has multiple openings that pass through the inside and outside. The body of the tube body 1401 is also provided with several elastic opening and closing mechanisms, and each elastic opening mechanism covers at least one opening.

[0041] In this embodiment, the outer surface of the tube 1401 is provided with multiple grooves.

[0042] In this embodiment, the elastic opening and closing mechanism includes: a push plate 1402, with rotating plates 1403 hinged to both ends of the inner surface of the push plate 1402, and the end of the rotating plate 1403 facing away from the push plate 1402 is hinged to a sliding block 1404, the sliding block 1404 is installed in a slide groove and is also connected to an auxiliary spring 1405, the auxiliary spring 1405 is installed in the slide groove; the opening in the body of the tube 1401 is covered by the push plate 1402, with one push plate covering one opening.

[0043] The push plate 1402 opens after being pressed by the inner surface, and the pressure liquid contacts the inner surface of the expanded rubber 1 through the inner channel.

[0044] In this embodiment, there are multiple elastic opening and closing mechanisms, which are evenly distributed along the axial direction of the tube body 1401.

[0045] In this embodiment, two support rings 1406 are fixedly connected to the inner wall of the tube body 1401, and the two support rings 1406 correspond to the two ends of the elastic opening and closing mechanism, respectively.

[0046] In this embodiment, multiple outer partitions 5 are uniformly installed on the outer circumference of the expanded rubber 1.

[0047] The installation of the outer partition 5 can improve the structural strength of the expanded rubber 1. Furthermore, the small contact area between the outer partition 5 and the inner wall of the well shaft and the high pressure can improve the expansion uniformity of the expanded rubber 1 and prevent uneven axial contact pressure between the rubber and the well wall.

[0048] In this embodiment, the clamping and fixing mechanism 8 includes an external threaded tube 801, a sealing ring 802, a sealing clamping ring 803, a mounting groove 804, a movable threaded tube 805, and a threaded fixing section 806. The inner circumference of the two threaded fixing tubes 13 is fixed with two threaded fixing sections 806 by threads. Two external threaded tubes 801 are installed on one side of each of the two threaded fixing sections 806. A first connecting section 4 and a second connecting section 6 are respectively installed at one end of each of the two external threaded tubes 801.

[0049] In this embodiment, two movable threaded tubes 805 are sleeved around the two external threaded tubes 801 and connected by threaded engagement.

[0050] In this embodiment, two mounting grooves 804 are provided on one side of the interior of each of the two movable threaded tubes 805. Two sealing compression rings 803 are installed on one side of the interior of each of the two mounting grooves 804. The two sealing compression rings 803 are pressed and fixed to one side of the outer circumference of the two threaded fixed tubes 13. Two sealing rings 802 are installed on the inner edge of the two sealing compression rings 803. The sealing compression rings 803 and sealing rings 802 help to improve the sealing effect of the device. In use, the expansion rubber 1 is stably installed by the compression and fixing mechanism 8.

[0051] In this embodiment, eight outer partitions 5 are evenly installed on the outer circumference of the expanded rubber 1. The installation of the outer partitions 5 improves the structural strength of the expanded rubber 1. Furthermore, the outer partitions 5 have a small contact area with the inner wall of the well, resulting in high pressure, which can improve the expansion uniformity of the expanded rubber 1 and prevent uneven axial contact pressure between the rubber and the well wall.

[0052] In this embodiment, a first connector 2 is installed on one side of the first connecting segment 4, and a threaded connecting pipe 3 is installed on one side of the first connector 2. A first connecting hole 10 is opened in the center of the first connector 2, the threaded connecting pipe 3 and the first connecting segment 4.

[0053] In this embodiment, a second connector 7 is installed on one side of the second connecting section 6. An internal threaded connection hole 12 is provided on one side of the second connector 7. The internal threaded connection hole 12 is used to connect with another rubber dual-channel uniform expansion packer with distributed partition for fracturing.

[0054] To better understand the above exemplary embodiments, the working principle of a rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing according to the present invention will be further explained below.

[0055] In the process of using this invention, the expansion rubber 1 is first spliced ​​and installed using the clamping and fixing mechanism 8, and the threaded fixing section 806 is fixed to the threaded fixing tube 13 by threads. Then, the movable threaded tube 805 is rotated. Since the movable threaded tube 805 is fixedly connected to the external threaded tube 801 by threads, the rotation of the movable threaded tube 805 drives the sealing clamping ring 803 and the sealing ring 802 to move towards the sealing ring 9. At this time, the sealing clamping ring 803 and the sealing ring 802 clamp and fix the threaded fixing tube 13, improving the sealing effect. After the installation is completed, the threaded connecting tube 3 is then connected to the first sealing ring on another packer. The two connectors 7 are connected to achieve the splicing and assembly of multiple packers. After the splicing is completed, the packer is placed into the inner wall of the wellbore. At this time, fracturing fluid is introduced into the second connector 7, and then the fracturing fluid enters the internal threaded connection hole 12 and then enters the central hole 11. The fracturing fluid drives the pusher plate 1402 to move outward. As the pusher plate 1402 moves outward, the fracturing fluid flows out of the central hole 11 and contacts the inner surface of the expanding rubber 1. The fracturing fluid then enters the next packer through the first connecting hole 10 or enters the packer through the bottom perforation, forming an annulus with the well wall and contacting the outer surface of the expanding rubber. As the self-expanding rubber expands, the pusher plate 1402 closes, completing the setting. The first connector 2 is used to fix the first connecting section 4, the first connecting section 4 is used to fix the external threaded pipe 801, and the second connecting section 6 is used to install the second connector 7.

[0056] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0058] Although the present invention has been described above in conjunction with exemplary embodiments and accompanying drawings, those skilled in the art should understand that various modifications can be made to the above embodiments without departing from the spirit and scope of the claims.

Claims

1. A rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing, characterized in that, The packer includes an inflatable rubber and an inner support tube, wherein, Each end of the expanded rubber is equipped with a sealing ring, and a threaded fixing tube is installed on the outward side of each of the two sealing rings. A clamping and fixing mechanism is installed on one side of each of the two threaded fixing tubes. The inner support tube is disposed inside the expanding rubber. The inner support tube includes a tube body, and the two ends of the tube body are respectively connected to the sealing rings at both ends of the expanding rubber. The body of the tube body has multiple openings that pass through the inside and outside. The body of the tube body is also provided with several elastic opening and closing mechanisms, and each elastic opening mechanism covers at least one opening.

2. The rubber dual-channel uniform expansion packer with distributed partitions for fracturing according to claim 1, characterized in that, The outer surface of the tube is provided with multiple grooves; The elastic opening and closing mechanism includes: a push plate, with rotating plates hinged to both ends of the inner surface of the push plate, the end of the rotating plate away from the push plate being hinged to a sliding block, the sliding block being installed in a slide groove and also connected to an auxiliary spring, the auxiliary spring being installed in the slide groove.

3. The rubber dual-channel uniform expansion packer with distributed partitions for fracturing according to claim 1, characterized in that, The number of the elastic opening and closing mechanisms is multiple, and they are evenly distributed along the axial direction of the tube.

4. The rubber dual-channel uniform expansion packer with distributed partitions for fracturing according to claim 1, characterized in that, The inner wall of the tube is fixedly connected to two support rings, which correspond to the two ends of the elastic opening and closing mechanism, respectively.

5. The rubber dual-channel uniform expansion packer with distributed partitions for fracturing according to claim 1, characterized in that, Multiple outer partitions are evenly installed on the outer circumference of the expanded rubber. The outer partitions improve the expansion uniformity of the expanded rubber and prevent uneven axial contact pressure between the rubber and the well wall.

6. The rubber dual-channel uniform expansion packer with distributed partitions for fracturing according to claim 1, characterized in that, The clamping and fixing mechanism includes an external threaded tube, a sealing ring, a sealing clamping ring, a mounting groove, a movable threaded tube, and a threaded fixing section. The inner circumference of the two threaded fixing tubes is fixed with two threaded fixing sections by threads. Two external threaded tubes are installed on one side of each of the two threaded fixing sections. A first connecting section and a second connecting section are respectively installed at one end of each of the two external threaded tubes.

7. The rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing according to claim 6, characterized in that, Two movable threaded tubes are sleeved around the two externally threaded tubes and connected by threaded engagement.

8. The rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing according to claim 7, characterized in that, Two mounting grooves are provided on one side of the interior of each of the two movable threaded tubes. Two sealing and clamping rings are installed on one side of the interior of each of the two mounting grooves. The two sealing and clamping rings are pressed and fixed to one side of the outer circumference of the two threaded fixed tubes, and two sealing rings are installed on the inner edge of the two sealing and clamping rings.

9. The rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing according to claim 6, characterized in that, A first connector is installed on one side of the first connecting segment, and a threaded connecting pipe is installed on one side of the first connector. A first connecting hole is opened in the center of the first connector, the threaded connecting pipe and the first connecting segment.

10. The rubber dual-channel uniform expansion packer with distributed diaphragms for fracturing according to claim 6, characterized in that, A second connector is installed on one side of the second connecting section, and an internal threaded connection hole is opened on one side of the second connector.

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