Stratum testing round opening sealing probe

Abstract

The invention belongs to the technical field of formation testing, and discloses a formation testing round opening sealing probe which is longer in service life and higher in setting efficiency. Comprising a base sealing plate; the metal framework plate is fixedly connected to the base sealing plate and comprises a plate body fixedly connected with the base sealing plate, a first annular table and a second annular table, the first annular table and the second annular table extend upwards from the center area of the plate body, the second annular table and the first annular table are concentrically arranged, and the second annular table is located in the first annular table; the lining soft rubber is arranged between the first ring table and the second ring table; the metal lining is arranged on the periphery of the second ring table, and the bottom of the metal lining is connected with the lining soft rubber; and the setting rubber covers the peripheries of the first ring table and the metal lining and is fixed on the plate body. Wherein the hardness of the lining soft rubber is smaller than that of the setting rubber.

Description

Technical Field

[0001] The invention relates to the technical field of formation testing, and in particular to a formation testing circular-mouth sealing probe. Background Art

[0002] like Figure 5 As shown, the existing round-mouth sealing probe 100' is composed of a metal frame 1' and a sealing rubber 2'. In a high-pressure difference working environment, the sealing rubber 2' is often squeezed and sheared and torn due to the large internal and external pressure difference (external pressure is greater than internal pressure), so that the sealing rubber 2' is peeled off from the metal frame 1', thereby greatly reducing the service life of the round-mouth sealing probe and the sealing success rate of the round-mouth sealing probe. Summary of the invention

[0003] In order to solve the problem of tearing of the sealing rubber of a round-mouth sealing probe due to extrusion and shearing in a high-pressure difference working environment, to ensure the service life of the round-mouth sealing probe and to improve the sealing success rate of the round-mouth sealing probe, the present invention proposes a formation testing round-mouth sealing probe.

[0004] According to the present invention, the formation test circular port sealing probe comprises: a base sealing plate; a metal frame plate fixedly connected to the base sealing plate, the metal frame plate comprising a plate body fixedly connected to the base sealing plate, a first ring platform and a second ring platform extending upward from the central area of ​​the plate body, the second ring platform being arranged concentrically with the first ring platform and the second ring platform being located inside the first ring platform; a lining soft rubber arranged between the first ring platform and the second ring platform; a metal liner arranged at the periphery of the second ring platform and connected to the lining soft rubber at the bottom; and a setting rubber covering the periphery of the first ring platform and the metal liner and fixed to the plate body. The hardness of the lining soft rubber is less than the hardness of the setting rubber.

[0005] Furthermore, a surface of the metal lining facing the well wall is configured as a curved surface that can fit the well wall.

[0006] Furthermore, the metal lining includes a cylindrical body, a guide limit pin is formed on the inner wall of the cylindrical body, and a guide groove cooperating with the guide limit pin is formed on the outer peripheral wall of the second ring platform. The guide groove is constructed so that when the metal liner is compressed, the guide limit pin can move axially in the guide groove, and at the same time, the guide groove limits the circumferential rotation of the guide limit pin relative to the guide groove.

[0007] Furthermore, a metal filter is also arranged in the second ring platform, and the metal filter is connected to the plate body and the base sealing plate through fixing screws.

[0008] Furthermore, the metal filter includes a filter body fitted with the inner wall of the second ring platform and a lap platform extending radially outward from the top of the filter body, a lap groove is formed at the top of the inner circumferential wall of the second ring platform, and the lap platform is lapped in the lap groove.

[0009] Furthermore, the plate body is fixedly connected to the base sealing plate by screws.

[0010] Furthermore, a through hole is formed in the area of ​​the plate body located within the second ring platform, and a channel connected to the hydraulic pipeline is formed in the base sealing plate, and the through hole is connected to the channel.

[0011] Furthermore, a sealing groove is provided on one surface of the plate body facing the base sealing plate, the sealing groove is located at the outer periphery of the through hole, and a sealing ring is provided in the sealing groove.

[0012] Furthermore, the setting rubber is coated on the outer periphery of the first ring platform and the metal liner and fixed on the plate body by bonding or injection molding.

[0013] Furthermore, the soft rubber lining is in contact with the plate body, the first ring platform, the second ring platform and the metal lining.

[0014] Compared with the prior art, the formation test circular sealing probe of the present invention can ensure that the metal liner always supports the sealing rubber during the entire sealing process of the probe by using a metal liner and a liner soft rubber connected thereto, thereby avoiding the problem of the sealing rubber tearing and sealing failure caused by shear stress due to high pressure difference; by setting the hardness of the liner soft rubber connected to the metal liner to be lower than that of the sealing rubber, the metal liner will not affect the sealing effect of the sealing rubber under the same displacement compression of the sealing rubber and the metal liner, and at the same time, the metal liner uses a liner soft rubber with lower hardness, which can also prevent the intrusion of mud and sand, and avoid the occurrence of the metal liner being stuck. In addition, the metal liner realizes its linear displacement through the guide limit pin while limiting its own rotation, which makes installation and disassembly more convenient. In addition, an O-ring is used between the base sealing plate and the metal frame plate, and while being fastened by screws, the metal filter screen is also used as a fixing part to further fix the base sealing plate and the metal frame plate, which not only improves the fixing strength, but also makes it more convenient to replace the metal filter screen and the metal frame plate. The formation test circular sealing probe of the present invention solves the problem of the sealing probe's setting rubber being squeezed and sheared and torn in a high-pressure difference working environment, effectively ensures the service life of the sealing probe, and greatly improves the sealing success rate of the sealing probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional schematic diagram of the structure of a formation testing circular-mouth sealing probe according to an embodiment of the present invention;

[0016] Figure 2 It is a cross-sectional schematic diagram of the structure of a formation testing circular-mouth sealing probe according to an embodiment of the present invention;

[0017] Figure 3This is a physical picture of a formation testing circular-mouth sealing probe according to an embodiment of the present invention;

[0018] Figure 4 for Figure 2 The schematic diagram of the structure of the metal lining shown;

[0019] Figure 5 This is a physical picture of a circular-mouth sealing probe in the prior art. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Figures 1 to 3 FIG. 1 shows the structure of a formation testing circular port sealing probe 100 according to an embodiment of the present invention. Figures 1 to 3 As shown, the formation test circular port sealing probe 100 may include: a base sealing plate 1; a metal skeleton plate 2 fixedly connected to the base sealing plate 1, the metal skeleton plate 2 may include a plate body 21 fixedly connected to the base sealing plate 1, a first ring platform 22 and a second ring platform 23 extending upward from the central area of ​​the plate body 21, the second ring platform 23 is concentrically arranged with the first ring platform 22 and the second ring platform 23 is located inside the first ring platform 22; a lining soft rubber 3 arranged between the first ring platform 22 and the second ring platform 23; a metal liner 4 arranged at the periphery of the second ring platform 23 and connected to the lining soft rubber 3 at the bottom; and a setting rubber 5 covering the periphery of the first ring platform 22 and the metal liner 4 and fixed to the plate body 21. Among them, the hardness of the lining soft rubber 3 is less than the hardness of the setting rubber 5.

[0022] When the formation test circular-mouth sealing probe 100 of the embodiment of the present invention is working, the pushing force acts on the base sealing plate 1, carrying the entire formation test circular-mouth sealing probe 100 to the well wall, and the setting rubber 5 and the metal liner 4 are in contact with the well wall at the same time. Under the action of the pushing force, the setting rubber 5 and the liner soft rubber 3 are compressed at the same time. Since the hardness of the liner soft rubber 3 is less than the hardness of the setting rubber 5, the setting rubber 5 will completely isolate the inside and outside. During operation, a large pressure difference will be formed inside and outside the setting rubber 5, and the external pressure is much greater than the internal pressure. Under the action of this pressure difference, the setting rubber 5 will be subjected to a shear force from the outside to the inside, and due to the presence of the metal liner 4, the setting rubber 5 can be prevented from being deformed and causing tearing, thereby achieving the purpose of improving the success rate of setting.

[0023] The formation test circular sealing probe 100 of the embodiment of the present invention can ensure that the metal liner 4 always supports the sealing rubber 5 during the entire sealing process of the probe, thereby avoiding the problem of the sealing rubber 5 being torn due to shear stress caused by the high pressure difference, and the sealing failure; by setting the hardness of the liner soft rubber 3 connected to the metal liner 4 to be lower than the hardness of the sealing rubber 5, the sealing rubber 5 and the metal liner 4 are compressed with the same displacement, and the metal liner 4 will not affect the sealing effect of the sealing rubber 5. At the same time, the metal liner 4 uses the liner soft rubber 3 with lower hardness, which can also prevent the intrusion of mud and sand, and avoid the occurrence of the metal liner 4 being stuck. The formation test circular sealing probe 100 of the embodiment of the present invention solves the problem of the sealing probe being torn due to extrusion and shearing of the sealing rubber in the high pressure difference working environment, effectively ensures the service life of the sealing probe, and improves the sealing success rate of the sealing probe.

[0024] Furthermore, in Figures 1 to 3 In the preferred embodiment shown, the side of the metal lining 4 facing the well wall is constructed as a curved surface that can fit with the well wall, so as to ensure the fit between the metal lining 4 and the well wall.

[0025] According to the present invention, combined Figure 2 and Figure 4 As shown, the metal liner 4 may include a cylindrical body 41, a guide stop pin 42 is formed on the inner wall of the cylindrical body 41, and a guide groove 26 that cooperates with the guide stop pin 42 is formed on the outer peripheral wall of the second ring platform 23. The guide groove 26 is configured so that when the metal liner 4 is compressed, the guide stop pin 42 can move axially in the guide groove 26, and the guide groove 26 limits the circumferential rotation of the guide stop pin 42 relative to the guide groove 26. Since the metal liner 4 fits the well wall and has an arc, it needs to be ensured that it cannot rotate in the second ring platform 23 during operation. Therefore, the guide stop pin 42 is designed in the metal liner 4 to ensure that it will not rotate when compressed.

[0026] According to the present invention, Figure 1 As shown, the plate body 21 can be fixedly connected to the base sealing plate 1 by screws 9. Figure 1 As shown, four screws 9 can be preferably used for fixing, which is convenient for disassembly and replacement of the metal frame plate 2 .

[0027] Preferably, in Figures 1 to 3In the preferred embodiment shown, a metal filter screen 6 may also be provided in the second ring platform 23, and the metal filter screen 6 is preferably connected to the plate body 21 and the base sealing plate 1 by fixing screws 8. In this embodiment, the design of the metal filter screen 6 can prevent sandstone and the like in the formation from being sucked into the channel 11 of the instrument, causing blockage of the hydraulic pipeline connected to the channel 11, and can also serve as a fixing member for the metal skeleton plate 2 and the base sealing plate 1, so as to achieve a more stable fixation between the metal skeleton plate 2 and the base sealing plate 1.

[0028] Furthermore, if Figure 1 As shown, the metal filter 6 may include a filter body 61 that fits the inner wall of the second ring platform 23 and a lap platform 62 that extends radially outward from the top of the filter body 61. The top of the inner peripheral wall of the second ring platform 23 is formed with a lap groove 27, and the lap platform 62 is lapped in the lap groove 27. This arrangement can facilitate the installation and removal of the metal filter 6.

[0029] In such Figure 1 In the preferred embodiment shown, a through hole 24 is formed in the area of ​​the plate body 21 located within the second annular platform 23 , a channel 11 connected to the hydraulic pipeline is formed in the base sealing plate 1 , and the through hole 24 is connected to the channel 11 .

[0030] Furthermore, a sealing groove 25 is provided on the surface of the plate body 21 facing the base sealing plate 1, and the sealing groove 25 is located at the outer periphery of the through hole 24, and a sealing ring 7 is provided in the sealing groove 25. The sealing groove 25 is preferably an annular groove, and the sealing ring 7 is preferably an O-ring. The plate body 21 and the base sealing plate 1 are fastened with an O-ring and screws 9, so that the plate body 21 can be easily replaced.

[0031] According to the present invention, the setting rubber 5 can be coated on the outer periphery of the first ring platform 22 and the metal liner 4 by bonding or injection molding and fixed on the plate body 21. The lining soft rubber 3 can be abutted between the plate body 21, the first ring platform 22, the second ring platform 23 and the metal liner 4; further, the lining soft rubber 3 can also be fixed to the metal liner 4 by bonding or injection molding.

[0032] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0033] In the description of the present application, it should be understood that the terms "radial", "axial", "top", "bottom", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are 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 cannot be understood as a limitation on the present invention.

[0034] In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A formation testing circular sealing probe, characterized in that: include: Base sealing plate; A metal frame plate fixedly connected to the base sealing plate, the metal frame plate comprising a plate body fixedly connected to the base sealing plate, a first ring platform and a second ring platform extending upward from a central area of ​​the plate body, the second ring platform being arranged concentrically with the first ring platform and the second ring platform being located inside the first ring platform; A soft rubber lining provided between the first ring platform and the second ring platform; A metal lining which is arranged on the outer periphery of the second ring platform and connected to the lining soft rubber at the bottom; and The setting rubber covering the outer periphery of the first ring platform and the metal liner and fixed on the plate body, Wherein, the hardness of the lining soft rubber is smaller than the hardness of the setting rubber.

2. The formation testing circular sealing probe according to claim 1, characterized in that: The side of the metal lining facing the well wall is configured as a curved surface that can fit the well wall.

3. The formation testing circular sealing probe according to claim 1 or 2, characterized in that: The metal lining includes a cylindrical body, a guide limit pin is formed on the inner wall of the cylindrical body, and a guide groove cooperating with the guide limit pin is formed on the outer peripheral wall of the second ring platform. The guide groove is constructed so that when the metal liner is compressed, the guide limit pin can move axially in the guide groove, and at the same time, the guide groove limits the circumferential rotation of the guide limit pin relative to the guide groove.

4. The formation testing circular sealing probe according to claim 3, characterized in that: A metal filter is also arranged in the second ring platform, and the metal filter is connected to the plate body and the base sealing plate through fixing screws.

5. The formation testing circular sealing probe according to claim 4, characterized in that: The metal filter includes a filter body fitted with the inner wall of the second ring platform and a lap platform extending radially outward from the top of the filter body. A lap groove is formed at the top of the inner peripheral wall of the second ring platform, and the lap platform is lapped in the lap groove.

6. The formation testing circular sealing probe according to claim 4, characterized in that: The plate body is also fixedly connected to the base sealing plate by screws.

7. The formation testing circular sealing probe according to claim 6, characterized in that: A through hole is also formed in the area of ​​the plate body located within the second ring platform, a channel connected to the hydraulic pipeline is formed in the base sealing plate, and the through hole is connected to the channel.

8. The formation testing circular sealing probe according to claim 7, characterized in that: A sealing groove is provided on one surface of the plate body facing the base sealing plate. The sealing groove is located at the outer periphery of the through hole. A sealing ring is provided in the sealing groove.

9. The formation testing circular sealing probe according to claim 1 or 2, characterized in that: The setting rubber is coated on the outer periphery of the first ring platform and the metal liner and fixed on the plate body by bonding or injection molding.

10. The formation testing circular sealing probe according to claim 1 or 2, characterized in that: The soft rubber lining is in contact with the plate body, the first ring platform, the second ring platform and the metal lining.

Images