Magnetic control self-triggering pressure maintaining controller mounting structure and mounting method

Abstract

The magnetic control self-triggering pressure maintaining controller installation structure comprises an outer cylinder, a pressure maintaining controller and a magnetic part fixing assembly, the pressure maintaining controller comprises a valve seat and a valve clack, the magnetic part fixing assembly comprises a radial fixing part and an annular fixing part, the annular fixing part and a second magnetic part are both installed in an annular groove of the outer cylinder, and the annular fixing part and the second magnetic part are arranged in the annular groove. The second magnetic piece is clamped in the opening of the annular fixing piece; the radial fixing piece comprises a circular ring and a limiting part; the circular ring is in interference fit with the outer cylinder; and the limiting part extends downwards to the outside of the second magnetic piece. The magnetic parts on the outer cylinder are mechanically limited in the axial direction, the circumferential direction and the radial direction, temperature resistance, pressure resistance, corrosion resistance, acid and alkali resistance and load resistance are good, and the pressure maintaining reliability can be improved; the valve seat is fixed to the outer cylinder through the external threads, a valve seat sealing ring is omitted and replaced by red copper gasket end face sealing, the red copper gasket is good in sealing performance and can be used in a higher-temperature and higher-pressure environment, and valve seat sealing is more reliable; meanwhile, the operation is simpler.

Description

Technical Field

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

[0002] Pressure-maintaining coring generally faces a deep, high-temperature, and high-pressure drilling fluid environment with harsh working conditions. Conventional pressure-maintaining coring technology is often based on vertical coring. This team innovatively proposed a magnetically controlled self-triggered multi-directional pressure-maintaining coring technology, such as the simple-structured magnetically triggered multi-directional pressure-maintaining coring device disclosed in the Chinese patent document with publication number CN113958279A. For the magnetically controlled self-triggered multi-directional pressure-maintaining coring technology, the magnetically controlled self-triggered pressure-maintaining controller is the core pressure-maintaining component. Its triggering permanent magnet is installed inside the pressure-maintaining cabin. Due to the limitations of the processing conditions inside the pressure-maintaining cabin, it is impossible to process a suitable mechanical structure to fix the triggering permanent magnet, and the permanent magnet is often fixed in a specified position by high-temperature and high-pressure resistant glue. In addition, a sealing ring is used to seal 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 glue: When it is static, it is feasible to withstand temperature and pressure. However, when facing cyclic loads, acidity, alkalinity, and corrosive solutions underground, there is a risk of glue failure, causing the permanent magnet to fall off and unable to achieve pressure-maintaining triggering. Therefore, a new stable fixing method is needed for the permanent magnet.

[0004] 2. During the installation of the valve seat and the outer cylinder of the pressure-maintaining controller, the sealing ring will be squeezed and damaged if it is not operated correctly, resulting in seal failure. This problem is often difficult to find during the installation process. In addition, in field applications, complex operations are not conducive to work efficiency. Therefore, in deep, high-temperature and high-pressure environments, 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 installation method, which first solve the problems faced by the existing permanent magnet fixation, and secondly solve the problem of valve seat sealing.

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

[0007] The present application provides a magnetically controlled self-triggering pressure-maintaining controller installation structure, comprising an outer cylinder, a pressure-maintaining controller and a magnetic component fixing assembly, wherein the inner wall of the outer cylinder is provided with an annular groove; the pressure-maintaining controller comprises a valve seat and a valve flap, wherein the valve seat is coaxially installed in the outer cylinder, one end of the valve flap is movably connected to the upper end of the valve seat, and a first magnetic component is installed on the valve flap;

[0008] The magnetic member fixing assembly comprises a radial fixing member and an annular fixing member, the annular fixing member and the second magnetic member are both installed in the annular groove of the outer cylinder, the annular fixing member is an open ring, and the second magnetic member is stuck in the opening of the annular fixing member; when the valve flap is opened, the first magnetic member is directly opposite to the second magnetic member, and the first magnetic member and the second magnetic member repel each other; the radial fixing member comprises 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 in the outer cylinder and has an interference fit with the outer cylinder; the limiting part extends downward to block the second magnetic member.

[0009] Preferably, the radial fixing member is manufactured in one piece, and the limiting portion is a cylindrical structure on the same cylindrical surface as the circular ring.

[0010] Preferably, the outer diameter of the annular fixing member is larger than the diameter of the annular groove, and the annular fixing member is interference fit with the outer cylinder.

[0011] Preferably, the cross section of the open ring is C-shaped.

[0012] Optionally, the outer circumferential surface of the annular fixing member is arranged with textured grooves.

[0013] Optionally, the annular fixing piece is bonded to the outer cylinder by glue.

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

[0015] Furthermore, the outer cylinder includes a first section, a second section and a third section from bottom to top, the valve seat and the second section are manufactured integrally, the second section is threadedly connected to the first section via an internal thread, the outer cylindrical surface of the valve seat has an external thread and is threadedly connected to the third section via its external thread, the top of the first section abuts against the lower end surface of the valve seat, and a copper pad is installed between the upper end surface of the second section and the lower end surface of the first section.

[0016] The present application provides an installation method for a magnetically controlled self-triggering pressure-maintaining controller installation structure, comprising the following steps: after the annular fixing piece is cooled, the annular fixing piece is installed at a designated position of an annular groove of an outer cylinder, and as the temperature recovers, an interference fit is formed between the annular fixing piece and the outer cylinder to achieve friction fixation; thereafter, high temperature and corrosion resistant glue is added into the gap to assist fixation;

[0017] Then, the second magnetic member is installed in the annular groove and located at the opening position of the annular fixing member, and high temperature resistant and corrosion resistant glue is added between the second magnetic member and the annular groove to assist in fixing, so as to achieve annular fixing of the second magnetic member;

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

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

[0020] 1. This application uses a mechanical structure to mechanically limit the magnetic parts on the outer cylinder in the axial, circumferential and radial directions, and has good heat resistance, pressure resistance, corrosion resistance, acid and alkali resistance, and load resistance, 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 cylindrical surface of the valve seat, which is fixed to the outer tube through the external thread. The valve seat sealing ring is eliminated 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. The valve seat seal is more reliable. At the same time, it also avoids the problem of sealing ring extrusion and damage when installing the sealing ring. In addition, the valve seat is fixed to the outer tube thread, which makes the operation simpler. BRIEF 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 are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

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

[0024] Figure 2 is a schematic structural diagram of a radial fixing member in an embodiment;

[0025] Figure 3 It is a structural schematic diagram of the annular 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 A partial enlarged view of point A in the middle. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

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

[0031] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] like Figure 1 As shown, a magnetically controlled self-triggering pressure-maintaining controller installation structure disclosed in this embodiment includes an outer tube 1, a core tube 2, a center rod 3, a pressure-maintaining controller and a magnetic component fixing assembly, the core tube 2 is located in the outer tube 1, the lower end of the center rod 3 is connected to the core tube 2, and the pressure-maintaining controller includes a valve seat 41 and a valve flap 42, the valve seat 41 is coaxially installed in the outer tube 1, and 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 tube 2 can pass through the valve seat 41.

[0033] The valve flap 42 is provided with a first magnetic member 51, and the inner wall of the outer cylinder 1 is provided with a second magnetic member 52 which is mutually exclusive with the first magnetic member 51. When the valve flap 42 is opened, the first magnetic member 51 faces the second magnetic member 52. 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 an annular fixing member 7. The inner wall of the outer cylinder 1 has an annular groove adapted to the annular fixing member 7, and the annular fixing member 7 and the second magnetic member 52 are installed in the groove. The annular 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 annular fixing member 7.

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

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

[0037] Optional, such as Figure 3 As shown, the outer circumferential surface of the annular fixing member 7 is provided with a groove 72 to increase the friction between the annular groove and the annular fixing member 7. Preferably, the outer diameter of the annular fixing member 7 is larger than the diameter of the annular groove, and the annular fixing member 7 is interference-fitted with the outer cylinder 1 to form a compression contact with the outer cylinder 1, further increasing the friction.

[0038] like Figure 2 As shown, the radial fixing member 6 includes a ring 61 and a stopper 62, the upper end of the stopper 62 is connected to the ring 61, and the lower end of the stopper 62 extends axially. The ring 61 is coaxially mounted in the outer cylinder 1 and has an interference fit with the outer cylinder 1. The stopper 62 extends downward to block the second magnetic member 52, so as to prevent the second magnetic member 52 from radially escaping from the outer cylinder 1.

[0039] It is worth noting that the length of the limiting portion 62 is reasonably set according to needs.

[0040] Optionally, the radial fixing member 6 is manufactured in one piece, and the limiting portion 62 is a cylindrical structure on the same cylindrical surface as the 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 annular fixing member 7 is greater than the depth of the annular groove, so that the inner side wall of the annular fixing member 7 protrudes outside the outer tube 1, and the lower end of the radial fixing member 6 just contacts the upper end surface of the annular fixing member 7.

[0042] The convenient installation method of the second magnetic member 52 comprises the following steps:

[0043] First, the radial fixing member 6 and the annular fixing member 7 are processed;

[0044] After cooling the annular fixing member 7 by liquid nitrogen, the annular fixing member 7 is installed at the designated position of the annular groove of the outer tube 1. As the temperature recovers, an interference fit is formed between the annular fixing member 7 and the outer tube 1 to achieve friction fixation. After that, high temperature and corrosion resistant glue is added into the gap to assist fixation.

[0045] Then, the second magnetic member 52 is installed in the annular groove and located at the opening 71 of the annular fixing member 7, and high temperature resistant and corrosion resistant glue is added between the second magnetic member 52 and the annular groove to assist in fixing, so as to achieve annular 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 specified position. At this time, the limiting portion 62 of the radial fixing member 6 is directly opposite to the second magnetic member 52, thereby forming 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 friction fixation; and the annular groove realizes axial fixation of the second magnetic member 52, thereby achieving the purpose of fixing the second magnetic member 52.

[0047] In order to prevent the seal between the valve seat and the outer cylinder from being damaged due to improper operation of the workers during the installation of the pressure-maintaining controller, the seal fails 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 to be threaded. Specifically: Figure 3 , Figure 4 As shown, the outer cylinder 1 includes a first section 11, a second section 12 and a third section 13 from bottom to top. Preferably, the valve seat 41 is manufactured integrally with the second section 12, the second section 12 is threadedly connected to the first section 11 via 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 via its external thread, and the top of the first section 11 abuts against the lower end surface of the valve seat 41.

[0048] A copper pad 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 tube 1, and the outer portion and the third section 13 are sealed by the copper pad 8, which replaces the original sealing ring, and can solve the problem of sealing ring damage. In addition, the copper pad has good sealing performance and can be used in a higher temperature and pressure environment; and there will be no random initial sealing phenomenon.

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

Claims

1. A magnetically controlled self-triggering pressure-maintaining controller installation structure, characterized in that: include: An outer cylinder (1) having an annular groove on its inner wall; The pressure-maintaining controller comprises a valve seat (41) and a valve flap (42), wherein the valve seat (41) is coaxially mounted in 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 mounted on the valve flap (42); A magnetic member fixing assembly comprises a radial fixing member (6) and an annular fixing member (7), wherein the annular fixing member (7) and the second magnetic member (52) are both mounted in the annular groove of the outer cylinder (1), the annular fixing member (7) is an open ring, and the second magnetic member (52) is clamped in the opening (71) of the annular fixing member (7); when the valve flap (42) is opened, the first magnetic member (51) and the second magnetic member (52) are opposite to each other, and the first magnetic member (51) and the second magnetic member (52) repel each other; The radial fixing member (6) comprises a circular ring (61) and a limiting portion (62), wherein 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 mounted in the outer cylinder (1) and is interference-fitted with the outer cylinder (1); the limiting portion (62) extends downward to block the outside of the second magnetic member (52).

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

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

4. The magnetically controlled self-triggering pressure-maintaining controller installation structure according to claim 1 is characterized in that: The cross section of the open ring (7) is C-shaped.

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

6. A magnetically controlled self-triggering pressure-maintaining controller installation structure according to claim 1 or 3, characterized in that: The annular fixing member (7) is bonded to the outer cylinder (1) by glue.

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

8. The magnetically controlled self-triggering pressure-maintaining controller installation structure according to claim 1, characterized in that: The outer cylinder (1) comprises, from bottom to top, a first section (11), a second section (12) and a third section (13); the valve seat (41) and the second section (12) are manufactured as one piece; the second section (12) is threadedly connected to the first section (11) via 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) via its external thread; the top of the first section (11) abuts against the lower end surface of the valve seat (41); a copper pad (8) is installed between the upper end surface of the second section (12) and the lower end surface of the first section (11).

9. A method for installing a magnetically controlled self-triggering pressure-maintaining controller installation structure according to any one of claims 1 to 8, characterized in that: The following steps are involved: After the annular fixing member (7) is cooled, the annular fixing member (7) is installed at a designated position of the annular groove of the outer tube (1). As the temperature recovers, an interference fit is formed between the annular fixing member (7) and the outer tube (1), thereby achieving friction fixation. Thereafter, high temperature resistant and corrosion resistant glue is added into the gap to assist fixation. Then, the second magnetic member (52) is installed in the annular groove and located at the opening (71) of the annular fixing member (7), and high temperature resistant and corrosion resistant glue is added between the second magnetic member (52) and the annular groove to assist in fixing, thereby achieving annular fixation of the second magnetic member (52); After the radial fixing member (6) is cooled, the radial fixing member (6) is installed at a 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), thereby achieving friction fixation.

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