Modularized shielding body for neutron logging instrument and neutron logging system

Abstract

The utility model relates to the technical field of neutron logging, and discloses a modularized shielding body for a neutron logging instrument and a neutron logging system.The modularized shielding body for the neutron logging instrument comprises at least two shielding units, and the at least two shielding units are sequentially arranged in the first direction; every two adjacent shielding units are connected with each other in the first direction. According to the modularized shielding body for the neutron logging instrument, the technical problem of how to improve the adaptation flexibility of the shielding body on the logging instrument can be solved, the modularized shielding body for the neutron logging instrument not only can be changed along with the structural change of the neutron logging instrument, but also can be changed along with the local damage of the shielding body. And only the shielding unit corresponding to local damage needs to be replaced, so that the maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of neutron logging technology, specifically to a modular shield and neutron logging system for neutron logging instruments. Background Technology

[0002] Neutron logging involves lowering a downhole instrument equipped with a neutron source and detectors into the well. Fast neutrons emitted from the neutron source migrate outwards in a spherical pattern. As they penetrate the wellbore medium and enter the rock formation, the high-energy neutrons interact with the atomic nuclei of the matter, slowing them down. Their energy is continuously lost or weakened through diffusion and absorption. Two detectors with different source-to-detection distances are used to measure the ratio of thermal neutron count rates, reflecting the rate at which the neutron density in the formation decays with increasing source-to-detection distance. The detection results are transmitted via cable to surface instruments, where they are processed and the curves are recorded.

[0003] Currently, patent CN116877052A, "A Controllable Source Neutron Density Logging Instrument," proposes using a shielding design to fundamentally improve lithology-related issues in neutron density logging. However, the integral shielding structure is inconvenient to maintain and difficult to manufacture. In other words, if the logging instrument structure changes, the integral shielding structure cannot be flexibly adjusted accordingly.

[0004] In related technologies, how to improve the adaptability of shielding bodies to logging instruments is one of the technical problems that urgently need to be solved by those skilled in the art. Utility Model Content

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a modular shielding body for neutron logging instruments that can not only adapt to changes in the structure of the neutron logging instrument, but also, if the shielding body suffers partial damage, only the corresponding damaged shielding unit needs to be replaced, thereby reducing maintenance costs.

[0006] The modular shielding body for neutron logging instruments of this utility model includes:

[0007] At least two shielding units are arranged sequentially in a first direction, and adjacent shielding units are connected to each other in the first direction.

[0008] A complete shield can be formed by at least two shielding units, and the length of the shield can be adjusted according to the length of the neutron logging instrument. Furthermore, if the shield is partially damaged, the corresponding shielding unit can be replaced, reducing maintenance costs and repair time. In other words, the modular shield for neutron logging instruments in this specific embodiment of the invention not only adapts to changes in the structure of the neutron logging instrument, but also, in the event of partial damage, only the corresponding shielding unit needs to be damaged, thereby reducing maintenance costs.

[0009] Optionally, one of two adjacent shielding units is designated as the first shielding unit, and the other of the two adjacent shielding units is designated as the second shielding unit;

[0010] The surface of the first shielding unit used for connecting with the second shielding unit has a local recessed area;

[0011] The second shielding unit has a local raised area on the surface used to connect with the first shielding unit;

[0012] The local concave area is adapted to the local convex area.

[0013] Optionally, the side of the local recessed area is provided with one of a guide groove and a guide protrusion;

[0014] The side of the local protrusion area is provided with the guide groove and the other of the guide protrusions;

[0015] The guide groove is adapted to the guide protrusion.

[0016] Optionally, the shielding unit is provided with an eccentric through hole in the first direction.

[0017] Optionally, the outer periphery of the sidewall of the shielding unit is cylindrical.

[0018] Optionally, the neutron logging system includes a modular shield for the neutron logging instrument. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the assembly of a modular shield for a neutron logging instrument in a specific embodiment of this utility model.

[0020] Figure 2 This is a schematic diagram of the shielding unit in a specific embodiment of the present invention.

[0021] Reference numerals: 1000-Shielding body, 100-Shielding unit, 101-First shielding unit, 102-Second shielding unit, 110-Eccentric through hole, 120-Guide groove, 130-Guide protrusion, 140-Partial recessed area, 150-Partial protruding area. Detailed Implementation

[0022] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0023] The modular shielding body 1000 for a neutron logging instrument according to an embodiment of the present invention is described below with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the modular shield 1000 for neutron logging instruments in this embodiment of the present invention includes at least two shielding units 100, which are arranged sequentially in a first direction, and adjacent shielding units 100 are connected to each other in the first direction.

[0024] According to a specific embodiment of the present invention, a modular shielding body 1000 for a neutron logging instrument can be formed by at least two shielding units 100, and the length of the shielding body 1000 can be adjusted according to the length of the neutron logging instrument. Furthermore, if the shielding body 1000 suffers partial damage, the maintenance cost and repair time can be reduced by replacing the corresponding shielding unit 100. In other words, the modular shielding body 1000 for a neutron logging instrument in this specific embodiment of the present invention can not only adapt to changes in the structure of the neutron logging instrument, but also, if the shielding body 1000 suffers partial damage, only the corresponding shielding unit 100 needs to be replaced, thereby reducing maintenance costs.

[0025] like Figure 1 and Figure 2 As shown, in order to make the technical solution of this application easier to understand, the technical solution of this application will be described in more detail below with a specific embodiment of the modular shield 1000 used for neutron logging instruments.

[0026] In some specific embodiments, such as Figure 1 As shown, the modular shield 1000 used for neutron logging instruments is mainly designed to reduce the interaction between neutrons and matter in the wellbore, while also shielding against gamma rays generated outside the formation.

[0027] In some specific embodiments, such as Figure 1 and Figure 2As shown, compared to traditional integral shielding bodies, the modular shielding body 1000 for neutron logging instruments in this specific embodiment is composed of at least two shielding units 100 arranged sequentially in a first direction, wherein adjacent shielding units 100 are interconnected in the first direction. The shielding body 1000, composed of at least two shielding units 100, can flexibly adjust the number of shielding units 100 according to changes in the structure of the logging instrument, thereby adapting to the structure of the logging instrument and meeting the needs of logging equipment with different structures. In other words, the shielding body 1000 has a high degree of adaptability compared to traditional shielding bodies. That is, traditional shielding bodies 1000 cannot flexibly adjust their structure according to changes in the structure of the logging instrument. Furthermore, since the shielding body 1000 is composed of at least two shielding units 100, the shielding units 100 can be replaced according to the structure and location of the neutron source and shielding requirements, which can reduce the on-site assembly time of the shielding body 1000, reduce the demand for assembly equipment, and improve the efficiency of logging operations. Furthermore, during prolonged operation and in the complex environment of the measuring well, the shield 1000 is prone to localized damage, which can lead to measurement errors. In this specific embodiment, only the partially damaged shielding unit 100 can be replaced, unlike traditional monolithic shields which require replacement of the entire shield when partial damage occurs, thus significantly reducing maintenance costs. Finally, the shield 1000 is made of special materials and is difficult to manufacture. By disassembling the shield 1000 into multiple shielding units 100, the manufacturing difficulty can be reduced, and the shielding units 100 are easier to transport.

[0028] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the shielding unit 100 has an eccentric through hole 110 in the first direction. Specifically, when at least two shielding units 100 form a shielding body 1000, an installation space for installing a neutron measuring instrument can be formed between the eccentric through holes 110. The neutron measuring instrument can emit neutrons, which can pass through the thinner side of the shielding body 1000. The thicker side of the shielding body 1000 can shield against neutrons and gamma rays.

[0029] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the eccentric through hole 110 and the guide groove 120 are arranged at intervals to avoid interference between the guide groove 120 and the neutron measuring instrument.

[0030] In some specific embodiments, such as Figure 1 and Figure 2 As shown, the outer periphery of the side wall of the shielding unit 100 is cylindrical, including cylindrical, triangular prism and polygonal prism, etc.

[0031] In some specific embodiments, the shielding unit 100 includes photon shielding material and neutron shielding material.

[0032] In some specific embodiments, such as Figure 1 As shown, one of two adjacent shielding units 100 is designated as the first shielding unit 101, and the other is designated as the second shielding unit 102. The surface of the first shielding unit 101 where it connects to the second shielding unit 102 has a local recessed area 140, and the surface of the second shielding unit 102 where it connects to the first shielding unit 101 has a local protruding area 150. The local recessed area 140 and the local protruding area 150 are adapted to each other. Specifically, the first shielding unit 101 and the second shielding unit 102 are fitted together through the local recessed area 140 and the local protruding area 150. In the axial section of the shielding body 1000, the boundary between the first shielding unit 101 and the second shielding unit 102 is Z-shaped, which can avoid the existence of straight seams and prevent radiation leakage.

[0033] In some specific embodiments, such as Figure 1 As shown, the side of the partially recessed area 140 is provided with one of a guide groove 120 and a guide protrusion 130, and the side of the partially raised area 140 is provided with the other of a guide groove 120 and a guide protrusion 130. The guide groove 120 is adapted to the guide protrusion 130. Specifically, the first shielding unit 101 and the second shielding unit 102 are adapted to the guide protrusion 130 through the guide groove 120, thereby realizing the rapid positioning and fixing of the first shielding unit 101 and the second shielding unit 102.

[0034] In some specific embodiments, the neutron logging system includes the modular shielding described above for neutron logging instruments.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", 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 this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0038] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A modular shield for a neutron logging instrument, characterized by, include: At least two shielding units are arranged sequentially in a first direction, and adjacent shielding units are connected to each other in the first direction.

2. The modular shield for a neutron logging instrument of claim 1, wherein, One of the two adjacent shielding units is designated as the first shielding unit, and the other of the two adjacent shielding units is designated as the second shielding unit; The surface of the first shielding unit used for connecting with the second shielding unit has a local recessed area; The second shielding unit has a local raised area on the surface used to connect with the first shielding unit; The local concave area is adapted to the local convex area.

3. The modular shielding body for neutron logging instruments according to claim 2, characterized in that, The side of the local recessed area is provided with one of a guide groove and a guide protrusion; The side of the local protrusion area is provided with the guide groove and the other of the guide protrusions; The guide groove is adapted to the guide protrusion.

4. The modular shielding body for neutron logging instruments according to claim 3, characterized in that, The shielding unit has an eccentric through hole in the first direction.

5. The modular shielding body for a neutron logging instrument according to any one of claims 1-4, characterized in that, The outer periphery of the sidewall of the shielding unit is cylindrical.

6. A neutron logging system characterized by, include: Modular shielding for neutron logging instruments according to any one of claims 1-5.

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