Nuclear magnetic circuit high-voltage shell device

Abstract

The utility model discloses a nuclear magnetic circuit high-voltage shell device, which relates to the technical field of high-voltage shells and comprises a pressure-bearing shaft cylinder, two ends of the pressure-bearing shaft cylinder are respectively provided with an end positioning groove and a semicircular key groove for connection, one end of the pressure-bearing shaft cylinder is provided with a stepped shaft surface, and a small end surface of the stepped shaft surface is provided with a positioning groove and a sealing groove. A chuck groove, two kidney-shaped key grooves and a mud hole are sequentially formed in the large end face of the middle of the pressure-bearing shaft barrel, and the pressure-bearing shaft barrel is made of titanium alloy. The weight of the shell is reduced, meanwhile, the bearing pressure can be increased to 170 Mpa, the high temperature resistance and corrosion resistance are excellent, the compression strength is improved, the use requirement is met, and the well logging task can be better completed.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage shells, in particular to a high-voltage shell device for a nuclear magnetic circuit. Background Art

[0002] The nuclear magnetic resonance imaging logging instrument consists of three parts: electronic circuit, capacitor short circuit, and nuclear magnetic probe. The electronic circuit is the core part of the entire nuclear magnetic instrument string, realizing functions such as signal control, signal processing, signal transmission, signal reception, RF pulse transmission, low-voltage power supply, and high-voltage DC voltage power supply. The entire nuclear magnetic electronic circuit consists of fourteen modules with different functions. Each module is enclosed in a shielding box. These modules are fixed to the instrument electronic circuit skeleton with screws and then installed in a magnetic-proof pressure-bearing shell. The instrument shell adopts a shaft-cylinder design. The upper and lower joints are connected by threads. The upper and lower joints are designed with grooves to install pressure-bearing sealing rings for sealing.

[0003] The current nuclear magnetic circuit shell is made of beryllium bronze material. The shell can withstand a pressure of 140MPa and weighs 84Kg. If the pressure reaches above 170MPa, the thickness of the shell needs to be further increased, but the weight will also increase too much and will not meet the usage requirements. Utility Model Content

[0004] The purpose of the utility model is to provide a high-voltage shell device for a nuclear magnetic circuit, so as to solve the problems existing in the above-mentioned prior art, reduce the weight of the shell while increasing the pressure bearing capacity, and meet the use requirements.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a nuclear magnetic circuit high-voltage housing device, comprising a pressure-bearing shaft cylinder, wherein both ends of the pressure-bearing shaft cylinder are respectively provided with end positioning grooves and semicircular key grooves for connection, one end of the pressure-bearing shaft cylinder is provided with a stepped shaft surface, the small end surface of the stepped shaft surface is provided with the positioning groove and the sealing groove, a chuck groove, two waist-shaped key grooves and a mud hole are sequentially provided on the middle large end surface of the pressure-bearing shaft cylinder, and the material of the pressure-bearing shaft cylinder is titanium alloy.

[0007] Preferably, two sealing grooves are provided and the interval between them is 9mm-12mm.

[0008] Preferably, a sealing ring and a retaining ring are accommodated in the sealing groove.

[0009] Preferably, the sealing ring is made of fluororubber, and the retaining ring is made of polyetheretherketone.

[0010] Preferably, an integrated open ring is provided between the sealing groove and the large end surface of the stepped shaft surface, the integrated open ring is a conical ring, a mounting groove is formed between the large end of the conical ring and the large end surface of the stepped shaft surface, and the mounting groove is used to connect a threaded ring.

[0011] Preferably, a plurality of pairs of positioning grooves are provided between the two waist-shaped key grooves, and the positioning grooves are used to connect the eccentric bow device.

[0012] Preferably, six pairs of positioning grooves are provided, each pair has two and are located on the same cross section, and the central angle between each pair of positioning grooves is 132°±1°.

[0013] Preferably, the positioning grooves are circular grooves with a depth of 2 mm, the axial spacing between the two middle pairs of positioning grooves is 1185 mm, and the axial spacing between other adjacent positioning grooves is 85 mm.

[0014] Preferably, the corners of the sealing groove are provided with rounded corners.

[0015] Preferably, the outer diameter of the pressure-bearing shaft cylinder is 99 mm and the wall thickness is 13.2 mm.

[0016] Preferably, the total weight of the pressure-bearing shaft cylinder is 72Kg, and the pressure-bearing shaft cylinder can withstand a pressure of 170Mpa.

[0017] Compared with the prior art, the utility model has achieved the following technical effects:

[0018] The utility model reduces the weight of the shell and can increase the pressure to 170Mpa, and has excellent high temperature resistance and corrosion resistance, and also improves the compressive strength, meets the use requirements, and can better complete the logging task. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a schematic diagram of the external structure of the high-voltage housing device for a nuclear magnetic circuit in an embodiment of the utility model;

[0021] Figure 2 In the embodiment of the utility model Figure 1 Schematic diagram of the cross-sectional structure of AA;

[0022] Figure 3This is a schematic diagram of the end structure of the high-voltage housing device of the nuclear magnetic circuit in the embodiment of the utility model;

[0023] Figure 4 In the embodiment of the utility model Figure 3 A magnified schematic diagram of the local structure at B in the middle;

[0024] Figure 5 In the embodiment of the utility model Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0025] Figure 6 In the embodiment of the utility model Figure 1 A magnified schematic diagram of the local structure at C in the middle;

[0026] Figure 7 In the embodiment of the utility model Figure 2 Schematic diagram of the cross-sectional structure of the middle DD;

[0027] Figure 8 In the embodiment of the utility model Figure 7 Schematic diagram of the cross-sectional structure of EE;

[0028] Fig. 9 In the embodiment of the utility model Figure 1 Schematic diagram of the cross-sectional structure of the FF;

[0029] Fig.10 This is a schematic diagram of the assembly relationship of the high-voltage housing device of the nuclear magnetic circuit in the embodiment of the utility model;

[0030] In the figure: 1-end positioning groove, 2-semicircular keyway, 3-chuck groove, 4-waist keyway, 5-mud hole, 6-sealing groove, 7-positioning groove, 8-round corner, 9-integrated open ring, 10-pressure-bearing shaft cylinder, 11-PEEK retaining ring, 12-sealing ring, 13-protective cap, 14-protective plug, 15-threaded ring. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The utility model aims to provide a high-voltage shell device for a nuclear magnetic circuit, so as to solve the problems existing in the prior art, reduce the weight of the shell while increasing the pressure bearing capacity, and meet the use requirements.

[0033] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] Embodiment 1

[0035] like Figures 1 to 10 As shown, in this embodiment, a nuclear magnetic circuit high-voltage housing device 100 is provided, including a pressure-bearing shaft cylinder 10, and the two ends of the pressure-bearing shaft cylinder 10 are respectively provided with end positioning grooves and semicircular keyways for connection, one end of the pressure-bearing shaft cylinder 10 is provided with a stepped shaft surface, and the small end surface of the stepped shaft surface is provided with a positioning groove and a sealing groove, and the middle large end surface of the pressure-bearing shaft cylinder 10 is sequentially provided with a chuck groove, two waist-shaped keyways and a mud hole, and the material of the pressure-bearing shaft cylinder 10 is titanium alloy. In this embodiment, the titanium alloy material is preferably TC18 titanium alloy, which has the characteristics of ultra-high hardness, high strength, high corrosion resistance, high toughness, high heat resistance, low density, light weight, etc., greatly reducing the weight of the nuclear magnetic housing, improving work safety and efficiency, and optimizing its mechanical properties, so that the pressure-bearing performance of the pressure-bearing shaft cylinder 10 reaches more than 170MPa, and the safety is improved. Among them, the end positioning groove, semicircular keyway and waist-shaped keyway are all used for positioning when docking instruments; the chuck groove is used to clamp the docking instrument at the wellhead during well logging; the mud hole is used to protect the outer shell from being crushed; when performing a sealing pressure test, the two ends of the pressure-bearing shaft cylinder 10 are respectively connected with a protective cap 13 and a protective plug 14.

[0036] As an optional solution, in this embodiment, two sealing grooves are provided and the interval between them is 9 mm-12 mm, preferably 11 mm, and the width of each sealing groove is 6 mm.

[0037] As an optional solution, in this embodiment, the corners of the sealing groove are provided with rounded corners to protect the sealing ring 12 from being damaged.

[0038] As an optional solution, the sealing groove in this embodiment contains a sealing ring 12 and a retaining ring. In this embodiment, the sealing groove is redesigned, and the width is increased compared to the original one, so that the sealing ring 12 and the PEEK retaining ring 11 can be accommodated at the same time, and the pressure bearing is higher. The high-quality peroxide fluororubber special sealing ring 12 can bear a pressure of 170Mpa, and a high-temperature polyetheretherketone (PEEK) retaining ring is installed. The sealing ring 12 and the PEEK retaining ring 11 are both made of imported materials, which are more superior in pressure bearing, high temperature resistance and corrosion resistance.

[0039] As an optional solution, in this embodiment, the material of the sealing ring 12 is fluororubber, and the material of the retaining ring is polyetheretherketone.

[0040] As an optional solution, an integrated open ring 9 is provided between the sealing groove and the large end face of the stepped shaft surface in this embodiment. The integrated open ring 9 is a conical ring. A mounting groove is formed between the large end of the conical ring and the large end face of the stepped shaft surface. The mounting groove is used to connect the threaded ring 15. The integrated open ring 9 structure of this embodiment increases the upper limit of the pressure bearing, is easy to install, and the shape, size and position can be determined according to the length of the threaded ring 15.

[0041] As an optional solution, several pairs of positioning grooves are provided between the two waist-shaped keyways in this embodiment, and the positioning grooves are used to connect the eccentric bow device. The positioning grooves are designed in this embodiment so that they can better fit the well wall in cooperation with the eccentric bow device, and can realize the efficient well wall construction of the nuclear magnetic logging instrument, providing convenient conditions for measuring eccentric nuclear magnetic, so that it can be used not only for P-type centered nuclear magnetic, but also for eccentric nuclear magnetic logging instruments, expanding the scope of use and better completing nuclear magnetic logging tasks. In this embodiment, an eccentric positioning hole is added, and when the instrument needs to perform eccentric logging, the eccentric bow can be installed for eccentric logging construction; when the instrument needs centered logging, the eccentric bow can be removed, and normal centered logging construction can be met at this time.

[0042] As an optional solution, in this embodiment, six pairs of positioning grooves are provided, each pair has two and are located on the same cross section, and the central angle between each pair of positioning grooves is 132°±1°, which can be set according to the positioning hole of the eccentric bow.

[0043] As an optional solution, in this embodiment, the positioning grooves are circular grooves with a depth of 2 mm, the axial spacing between the two pairs of positioning grooves in the middle is 1185 mm, and the axial spacing between other adjacent positioning grooves is 85 mm.

[0044] As an optional solution, the outer diameter of the pressure-bearing shaft cylinder 10 in this embodiment is 99 mm and the wall thickness is 13.2 mm. In this embodiment, the wall thickness of the pressure-bearing shaft cylinder 10 is thickened, and the sealing dimensions are completely redesigned according to the latest international sealing standards. Under data calculation, the pressure-bearing shaft cylinder 10 is made of high-quality titanium alloy, and the outer diameter is larger than the original. The pressure safety factor reaches 1.2, which can meet the requirements of the normal pressure safety factor of 1.0 and meet the high pressure pressure.

[0045] As an optional solution, in this embodiment, the total weight of the pressure-bearing shaft cylinder 10 is 72Kg, and the pressure-bearing shaft cylinder 10 can withstand a pressure of 170Mpa, which reduces the weight of the outer shell while increasing the pressure-bearing capacity and meets the use requirements.

[0046] The specific operation process of the pressure test of the high-pressure bearing shaft cylinder device of the nuclear magnetic circuit in this embodiment is as follows:

[0047] S1, after the pressure-bearing shaft cylinder 10 is processed, it is necessary to carefully check whether the processing dimensions, finish, chamfer and other parameters of each part of the part are consistent with the design requirements;

[0048] S2, the two ends of the pressure-bearing shaft cylinder 10 are sealed with sealing plugs, such as Fig.10 As shown, the pressure-bearing shaft cylinder 10 is placed in the pressure test well by using a special lifting device, and the wellhead is sealed according to the pressure test well operation requirements. The pressure of the pressure test well is increased from normal pressure to the required pressure and stabilized for 1-2 hours. During this period, the computer on the ground records and saves the pressure change curve of the pressure test well through the pressure sensor in the well;

[0049] S3, after the pressure test is completed, the pressure test well is depressurized, the pressure-bearing shaft cylinder 10 is taken out of the well and placed on a special bracket, and the metal surface of the pressure-bearing shaft cylinder 10 is checked for dents, cracks, deformations, etc., and the sealing ring, sealing ring 12, and retaining ring are checked for deformation, cracking, twisting, etc. If none of the above conditions exist, the pressure test is successful and the pressure-bearing shaft cylinder 10 meets the designed pressure-bearing standard.

[0050] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above examples are only used to help understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, according to the idea of ​​the utility model, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the utility model.

Claims

1. A high voltage enclosure device for a nuclear magnetic circuit, characterized in that: It includes a pressure-bearing shaft cylinder, both ends of which are respectively provided with end positioning grooves and semicircular keyways for connection, one end of the pressure-bearing shaft cylinder is provided with a stepped shaft surface, the small end surface of the stepped shaft surface is provided with the positioning groove and the sealing groove, the middle large end surface of the pressure-bearing shaft cylinder is sequentially provided with a chuck groove, two waist-shaped keyways and a mud hole, and the material of the pressure-bearing shaft cylinder is titanium alloy.

2. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: There are two sealing grooves with an interval of 9mm-12mm.

3. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: The sealing groove contains a sealing ring and a retaining ring; the sealing ring is made of peroxide fluororubber, and the retaining ring is made of polyetheretherketone.

4. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: An integral open ring is provided between the sealing groove and the large end surface of the stepped shaft surface. The integral open ring is a conical ring. A mounting groove is formed between the large end of the conical ring and the large end surface of the stepped shaft surface. The mounting groove is used to connect a threaded ring.

5. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: A plurality of pairs of positioning grooves are arranged between the two waist-shaped key grooves, and the positioning grooves are used to connect the eccentric bow device.

6. The nuclear magnetic circuit high voltage enclosure device according to claim 5, characterized in that: The positioning grooves are provided in six pairs, each pair has two and are located on the same cross section, and the central angle between each pair of the positioning grooves is 132°±1°.

7. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: The positioning grooves are circular grooves with a depth of 2 mm. The axial spacing between the two middle pairs of positioning grooves is 1185 mm, and the axial spacing between other adjacent positioning grooves is 85 mm.

8. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: The corners of the sealing groove are provided with rounded corners.

9. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: The outer diameter of the pressure-bearing shaft cylinder is 99 mm and the wall thickness is 13.2 mm.

10. The nuclear magnetic circuit high voltage enclosure device according to claim 1, characterized in that: The total weight of the pressure-bearing shaft cylinder is 72Kg, and the pressure-bearing shaft cylinder can withstand a pressure of 170Mpa.

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