A mounting structure and mounting method for a magnetically controlled self-triggering pressure-holding controller

Abstract

The present invention relates to an installation structure and installation method of a magnetically controlled self-triggering pressure-holding controller, including an outer cylinder, a pressure-holding controller, and a magnetic component fixing assembly. The pressure-holding controller includes a valve seat and a valve flap. The magnetic component fixing assembly includes a radial fixing member and a circumferential fixing member. The circumferential fixing member and the second magnetic component are both installed in the annular groove of the outer cylinder, and the second magnetic component is stuck in the opening of the circumferential fixing member; the radial fixing member includes a circular ring and a limiting portion, and the circular ring is in interference fit with the outer cylinder; the limiting portion extends downward to block outside the second magnetic component. This application performs axial, circumferential, and radial mechanical limiting on the magnetic components on the outer cylinder, with good temperature resistance, pressure resistance, corrosion resistance, acid and alkali resistance, and load resistance performance, which is beneficial to improving the pressure-holding reliability; in this application, the valve seat is fixed to the outer cylinder through external threads, the valve seat sealing ring is cancelled, and a copper gasket end face seal is adopted instead. The copper gasket has good sealing performance and can be used in a higher temperature and high pressure environment, and the valve seat seal is more reliable; at the same time, the operation is simpler.

Description

Technical Field

[0001] The present invention relates to the technical field of pressure - maintaining coring, and in particular to a magnetically - controlled self - triggering pressure - maintaining controller installation structure and an installation method thereof. Background Technique

[0002] Pressure - maintaining coring generally faces a deep high - temperature and high - pressure drilling fluid environment with harsh working conditions. Conventional pressure - maintaining coring techniques often focus on vertical coring. Our team innovatively proposed a magnetically - controlled self - triggering multi - directional pressure - maintaining coring technique. For example, the magnetically - triggered multi - directional pressure - maintaining coring device with a simple structure disclosed in the Chinese patent document with the publication number CN113958279A. For the magnetically - controlled self - triggering multi - directional pressure - maintaining coring technique, the magnetically - controlled self - triggering pressure - maintaining controller is the core pressure - maintaining component. Its trigger permanent magnet is installed inside the pressure - maintaining chamber. Due to the processing condition limitations inside the pressure - maintaining chamber, it is impossible to machine a suitable mechanical structure to fix the trigger permanent magnet, and the permanent magnet is often fixed at the specified position through high - temperature and high - pressure resistant glue. In addition, a sealing ring is used for sealing between the valve seat and the outer cylinder. However, in actual operation, two major problems are often faced:

[0003] 1. The permanent magnet is fixed by high - temperature and high - pressure resistant glue: When static, it is feasible in terms of temperature and pressure resistance. However, when facing cyclic loads, acid - base properties, and corrosive solutions underground, there is a risk of glue failure, resulting in the permanent magnet falling off and unable to achieve pressure - maintaining triggering. Therefore, a new stable fixing method for the permanent magnet is needed.

[0004] 2. During the installation process of the valve seat and the outer cylinder of the pressure - maintaining controller, if the sealing ring is not correctly operated, it will be squeezed and damaged, resulting in sealing failure, and this problem is often difficult to detect during the installation process. Moreover, in on - site applications, complex operations are not conducive to work efficiency. Therefore, in a deep high - temperature and high - pressure environment, a more reliable sealing method is needed. Summary of the Invention

[0005] The present invention provides a magnetically - controlled self - triggering pressure - maintaining controller installation structure and an installation method thereof, which primarily solve the problems faced by the existing fixation of permanent magnets and secondly solve the problem of valve seat sealing.

[0006] The present invention is realized through the following technical solutions:

[0007] A magnetically - controlled self - triggering pressure - maintaining controller installation structure provided in this application includes an outer cylinder, a pressure - maintaining controller, and a magnetic part fixing assembly. There is an annular groove on the inner wall of the outer cylinder; the pressure - maintaining controller includes a valve seat and a valve flap. The valve seat is coaxially installed inside the outer cylinder. One end of the valve flap is movably connected to the upper end of the valve seat, and a first magnetic part is installed on the valve flap.

[0008] The magnetic component fixing assembly includes a radial fixing component and a circumferential fixing component. The circumferential fixing component and the second magnetic component are both installed in the annular groove of the outer cylinder. The circumferential fixing component is an open ring, and the second magnetic component is stuck in the opening of the circumferential fixing component. When the valve flap is opened, the first magnetic component is facing the second magnetic component, and the first magnetic component and the second magnetic component repel each other. The radial fixing component includes a circular ring and a limiting part. The upper end of the limiting part is connected to the circular ring, and the lower end of the limiting part extends axially. The circular ring is coaxially installed inside the outer cylinder and is in interference fit with the outer cylinder. The limiting part extends downward to block outside the second magnetic component.

[0009] Preferably, the radial fixing component is integrally manufactured, and the limiting part is a cylindrical surface structure on the same cylindrical surface as the circular ring.

[0010] Preferably, the outer diameter of the circumferential fixing component is greater than the diameter of the annular groove, and the circumferential fixing component is in interference fit with the outer cylinder.

[0011] Preferably, the cross-section of the circumferential fixing component is C-shaped.

[0012] Optionally, the outer circumferential surface of the circumferential fixing component is provided with a texture groove.

[0013] Optionally, the circumferential fixing component is adhesively bonded to the outer cylinder with glue.

[0014] Optionally, the thickness of the circumferential fixing component is greater than the depth of the annular groove. The inner side wall of the circumferential fixing component protrudes outside the outer cylinder, and the lower end of the radial fixing component just abuts against the upper end surface of the circumferential fixing component.

[0015] Further, the outer cylinder includes a first section, a second section, and a third section from bottom to top. The valve seat is integrally manufactured with the second section. The second section is threadedly connected to the first section through an internal thread. The outer circumferential surface of the valve seat has an external thread and is threadedly connected to the third section through its external thread. The top of the first section abuts against the lower end surface of the valve seat, and a copper gasket is installed between the upper end surface of the second section and the lower end surface of the first section.

[0016] An installation method for the installation structure of a magnetically controlled self-triggering pressure-holding controller provided by this application includes the following steps: After the circumferential fixing component is cooled, install the circumferential fixing component at the designated position in the annular groove of the outer cylinder. As the temperature recovers, an interference fit is formed between the circumferential fixing component and the outer cylinder to achieve frictional fixation. Then, add high-temperature and corrosion-resistant glue to the gap for auxiliary fixation;

[0017] Then install the second magnetic component in the annular groove and at the opening position of the circumferential fixing component. Add high-temperature and corrosion-resistant glue between the second magnetic component and the annular groove for auxiliary fixation to achieve the circumferential fixation of the second magnetic component;

[0018] After the radial fixing member is cooled, the radial fixing member is installed at a specified position to form a radial constraint on the second magnetic member; thereafter, as the temperature recovers, an interference fit is formed between the radial fixing member and the outer cylinder to achieve frictional fixation.

[0019] Compared with the prior art, the present application has at least the following beneficial effects:

[0020] 1. The present application mechanically limits the magnetic member on the outer cylinder axially, circumferentially and radially through a mechanical structure, with good temperature resistance, pressure resistance, corrosion resistance, acid and alkali resistance, and load resistance performance, which is beneficial to improving the sealing reliability of the pressure maintaining controller;

[0021] 2. The present application provides an external thread on the outer circumferential surface of the valve seat and is fixed to the outer cylinder through the external thread. The valve seat sealing ring is cancelled and replaced with a copper gasket end face seal. The copper gasket has good sealing performance and can be used in a higher temperature and high pressure environment, making the valve seat seal more reliable; at the same time, the problem of extrusion damage of the sealing ring faced during the installation of the sealing ring is also avoided; in addition, the valve seat is fixed to the outer cylinder by threads, making the operation simpler. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the installation structure of the magnetically controlled self-triggering pressure maintaining controller when the valve flap is opened in the embodiment;

[0024] Figure 2 It is a schematic diagram of the structure of the radial fixing member in the embodiment;

[0025] Figure 3 It is a schematic diagram of the structure of the circumferential fixing member in the embodiment;

[0026] Figure 4 It is a schematic diagram of the installation structure of the magnetically controlled self-triggering pressure maintaining controller when the valve flap is closed in the embodiment;

[0027] Figure 5 For Figure 4 The partial enlarged view at position A in Detailed Embodiments

[0028] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. Components of the embodiments of the present invention usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0029] It should be noted that, without conflict, the implementation manners and features in the implementation manners of the present invention can be combined with each other. It should be noted that the embodiments in this specification are all described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this invention is normally placed, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0032] As Figure 1 shown, a magnetically controlled self-triggering pressure-holding controller installation structure disclosed in this embodiment includes an outer cylinder 1, a core barrel 2, a central rod 3, a pressure-holding controller, and a magnetic part fixing assembly. The core barrel 2 is located inside the outer cylinder 1. The lower end of the central rod 3 is connected to the core barrel 2. The pressure-holding controller includes a valve seat 41 and a valve flap 42. The valve seat 41 is coaxially installed inside the outer cylinder 1. One end of the valve flap 42 is movably connected to the upper end of the valve seat 41. When the valve flap 42 is opened, the core barrel 2 can pass through the valve seat 41.

[0033] A first magnetic member 51 is installed on the valve flap 42, and a second magnetic member 52 that is mutually exclusive with the first magnetic member 51 is installed on the inner wall of the outer cylinder 1. When the valve flap 42 is opened, the first magnetic member 51 and the second magnetic member 52 face each other. The first magnetic member 51 and the second magnetic member 52 are permanent magnets.

[0034] The magnetic member fixing assembly includes a radial fixing member 6 and a circumferential fixing member 7. There is an annular groove on the inner wall of the outer cylinder 1 that is adapted to the circumferential fixing member 7. The circumferential fixing member 7 and the second magnetic member 52 are installed in the groove. The circumferential fixing member 7 is an open ring, and the opening size of the open ring is adapted to the width of the second magnetic member 52. The second magnetic member 52 is just stuck in the opening 71 of the circumferential fixing member 7.

[0035] Preferably, the cross-section of the circumferential fixing member 7 is C-shaped.

[0036] The circumferential fixing member 7 is an open ring, so that the circumferential fixing member 7 has a certain deformation ability, which is convenient for embedding into the annular groove on the inner wall of the outer cylinder 1.

[0037] Optionally, as Figure 3 shown, the outer circumferential surface of the circumferential fixing member 7 is provided with a texture groove 72 to increase the friction force with the annular groove. Preferably, and the outer diameter of the circumferential fixing member 7 is greater than the diameter of the annular groove, and the circumferential fixing member 7 is in interference fit with the outer cylinder 1 to form an extrusion contact with the outer cylinder 1, further increasing the friction force.

[0038] As Figure 2 shown, the radial fixing member 6 includes a circular ring 61 and a limiting portion 62. The upper end of the limiting portion 62 is connected to the circular ring 61, and the lower end of the limiting portion 62 extends axially. The circular ring 61 is coaxially installed inside the outer cylinder 1 and is in interference fit with the outer cylinder 1. The limiting portion 62 extends downward to block outside the second magnetic member 52, which can prevent the second magnetic member 52 from radially slipping out of the outer cylinder 1.

[0039] It should be noted that the length of the limiting portion 62 is reasonably set according to needs.

[0040] Optionally, the radial fixing member 6 is integrally manufactured, and the limiting portion 62 is a cylindrical surface structure on the same cylindrical surface as the circular ring 61. Similarly, the outer diameter of the radial fixing member 6 is greater than the inner diameter of the outer cylinder 1.

[0041] Preferably, the thickness of the circumferential fixing member 7 is greater than the depth of the annular groove, so that the inner side wall of the circumferential fixing member 7 protrudes outside the outer cylinder 1, and the lower end of the radial fixing member 6 just abuts against the upper end surface of the circumferential fixing member 7.

[0042] A convenient installation method for the second magnetic member 52 includes the following steps:

[0043] First, process the radial fixing member 6 and the circumferential fixing member 7;

[0044] After cooling the circumferential fixing member 7 with liquid nitrogen, the circumferential fixing member 7 is installed at the designated position in the annular groove of the outer cylinder 1. As the temperature recovers, an interference fit is formed between the circumferential fixing member 7 and the outer cylinder 1 to achieve frictional fixation; thereafter, a high-temperature and corrosion-resistant glue is added to the gap for auxiliary fixation;

[0045] Then, the second magnetic member 52 is installed in the annular groove and located at the opening 71 position of the circumferential fixing member 7. A high-temperature and corrosion-resistant glue is added between the second magnetic member 52 and the annular groove for auxiliary fixation to achieve the circumferential fixation of the second magnetic member 52;

[0046] Finally, after cooling the radial fixing member 6 with liquid nitrogen, the radial fixing member 6 is installed at the designated position. At this time, the limiting portion 62 of the radial fixing member 6 is aligned with the second magnetic member 52, and then a radial constraint is formed on the second magnetic member 52. Thereafter, as the temperature recovers, an interference fit is formed between the radial fixing member 6 and the outer cylinder 1 to achieve frictional fixation; and the annular groove axially fixes the second magnetic member 52, so as to achieve the purpose of fixing the second magnetic member 52.

[0047] In order to prevent the seal ring between the valve seat and the outer cylinder from being damaged due to improper operation of workers during the installation of the pressure-holding controller, resulting in seal failure at the initial moment. In some embodiments, the valve seat structure is redesigned, and the outer cylindrical surface of the valve seat 41 is designed in a threaded shape. Specifically: as Figure 3 、 Figure 4 shown, the outer cylinder 1 includes a first section 11, a second section 12, and a third section 13 from bottom to top. As a preference, the valve seat 41 is integrally manufactured with the second section 12. The second section 12 is threadedly connected to the first section 11 through an internal thread. The outer cylindrical surface of the valve seat 41 has an external thread and is threadedly connected to the third section 13 through its external thread. The top of the first section 11 abuts against the lower end surface of the valve seat 41.

[0048] A copper gasket 8 is installed between the upper end surface of the second section 12 and the lower end surface of the first section 11. The external thread of the valve seat 41 is connected to the outer cylinder 1, and the external part and the third section 13 are sealed by relying on the copper gasket 8, replacing the original seal ring seal. The problem of seal ring breakage can be solved, and the copper gasket has good sealing performance and can be used in higher temperature and pressure environments; and there will be no phenomenon of random initial seal.

[0049] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A mounting structure of a magnetically controlled self-triggering pressure-holding controller, characterized in that, Comprising: An outer cylinder (1) with an annular groove on its inner wall; A pressure-holding controller, including a valve seat (41) and a valve flap (42). The valve seat (41) is coaxially installed inside the outer cylinder (1). One end of the valve flap (42) is movably connected to the upper end of the valve seat (41), and a first magnetic member (51) is installed on the valve flap (42); A magnetic member fixing assembly, including a radial fixing member (6) and a circumferential fixing member (7). The circumferential fixing member (7) and a second magnetic member (52) are both installed in the annular groove of the outer cylinder (1). The circumferential fixing member (7) is an open ring, and the second magnetic member (52) is stuck in the opening (71) of the circumferential fixing member (7); When the valve flap (42) is opened, the first magnetic member (51) faces the second magnetic member (52), and the first magnetic member (51) and the second magnetic member (52) repel each other; The radial fixing member (6) includes a circular ring (61) and a limiting portion (62). The upper end of the limiting portion (62) is connected to the circular ring (61), and the lower end of the limiting portion (62) extends axially; The circular ring (61) is coaxially installed inside the outer cylinder (1) and is in interference fit with the outer cylinder (1); The limiting portion (62) extends downward to block outside the second magnetic member (52).

2. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that, The radial fixing member (6) is integrally manufactured, and the limiting portion (62) is a cylindrical surface structure on the same cylindrical surface as the circular ring (61).

3. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that The outer diameter of the circumferential fixing member (7) is larger than the diameter of the annular groove, and the circumferential fixing member (7) is in interference fit with the outer cylinder (1).

4. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that, The cross-section of the circumferential fixing member (7) is C-shaped.

5. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that, The outer circumferential surface of the circumferential fixing member (7) is provided with a texture groove (72).

6. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1 or 3, characterized in that, The circumferential fixing member (7) is adhesively bonded to the outer cylinder (1) with glue.

7. The installation structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that, The thickness of the circumferential fixing member (7) is greater than the depth of the annular groove. The inner side wall of the circumferential fixing member (7) protrudes outside the outer cylinder (1), and the lower end of the radial fixing member (6) just abuts against the upper end surface of the circumferential fixing member (7).

8. A mounting structure of a magnetically controlled self-triggering pressure-holding controller according to claim 1, characterized in that, The outer cylinder (1) includes a first section (11), a second section (12), and a third section (13) from bottom to top. The valve seat (41) is integrally manufactured with the second section (12). The second section (12) is threadedly connected to the first section (11) through an internal thread. The outer circumferential surface of the valve seat (41) has an external thread and is threadedly connected to the third section (13) through its external thread. The top of the first section (11) abuts against the lower end surface of the valve seat (41), and a copper gasket (8) is installed between the upper end surface of the second section (12) and the lower end surface of the first section (11).

9. The installation method of a magnetically controlled self-triggering pressure-holding controller installation structure according to any one of claims 1-8, characterized in that, Including the following steps: After the circumferential fixing member (7) is cooled, the circumferential fixing member (7) is installed at a specified position in the annular groove of the outer cylinder (1). As the temperature recovers, an interference fit is formed between the circumferential fixing member (7) and the outer cylinder (1) to achieve frictional fixation; Thereafter, a high-temperature and corrosion-resistant glue is added to the gap to assist in fixation; Then, the second magnetic member (52) is installed in the annular groove and at the position of the opening (71) of the circumferential fixing member (7). A high-temperature and corrosion-resistant glue is added between the second magnetic member (52) and the annular groove to assist in fixation to achieve the circumferential fixation of the second magnetic member (52); After the radial fixing member (6) is cooled, the radial fixing member (6) is installed at the specified position to form a radial constraint on the second magnetic member (52); thereafter, as the temperature recovers, an interference fit is formed between the radial fixing member (6) and the outer cylinder (1) to achieve frictional fixation.

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