CN212207696U - Stable structure for improving accuracy of magnetic susceptibility probe tube measuring instrument in well - Google Patents
Stable structure for improving accuracy of magnetic susceptibility probe tube measuring instrument in well Download PDFInfo
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- CN212207696U CN212207696U CN202021227308.7U CN202021227308U CN212207696U CN 212207696 U CN212207696 U CN 212207696U CN 202021227308 U CN202021227308 U CN 202021227308U CN 212207696 U CN212207696 U CN 212207696U
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Abstract
The utility model relates to an improve stable structure of magnetic susceptibility probe tube measuring instrument degree of accuracy in well, include and constitute by cylinder size casing, spring, circular button and lock joint board, and be fixed in the outside strutting arrangement of the cylinder size at magnetic susceptibility probe tube measuring instrument middle part, inside the spring is located cylinder size casing, circular button passes through the lock joint board and extrudees fixedly with cylinder type casing, and its rear end passes cylinder type casing and contacts with the spring free end. The utility model adopts the cylindrical external supporting device, and solves the problem that the magnetic susceptibility error measured by the magnetic susceptibility probe is larger due to overlarge well diameter when the existing magnetic susceptibility probe is used for measuring rock and ore in a well; the cylindrical external supporting device can enable the instrument to be tightly attached to the well wall, so that the measurement precision of the susceptibility probe tube facing a large well diameter is improved; through button and spring, the effectual problem of having avoided causing the instrument to block because of having the unevenness of small part in the well has strengthened the whole measurability of instrument in the well.
Description
Technical Field
The utility model belongs to the technical field of the magnetic susceptibility measures in the well, concretely relates to improve stable structure of magnetic susceptibility probe tube measuring instrument degree of accuracy in the well.
Background
In the measurement of ores and rocks, magnetic susceptibility is a very important parameter. The magnetic susceptibility value is measured, particularly, the magnetic susceptibility value is directly measured in a well, and the magnetic susceptibility value has more direct significance for dividing rock stratum interfaces, determining certain lithology and determining magnetite grade.
Currently, the instruments capable of directly measuring the magnetic susceptibility of rock ore in a well are the BBS-02B magnetic susceptibility probe of Bartinton, UK, the JCH-2 magnetic susceptibility probe of Shanghai geological instruments and the H411 magnetic susceptibility probe of Chongqing geological instruments.
According to the basic theory of electromagnetic induction, the self-inductance L of the induction coil can be obtained as follows:
in the formula: n is the number of turns of the induction coil, RmIs a magnetic resistance mu formed by connecting an induction coil with an external magnetic medium in seriesx、sx、lxRespectively the magnetic permeability of the core of the induction coil, the cross section and the length of the magnetic circuit of the core, muy、sy、lyRespectively the magnetic permeability, the cross section and the length of the external magnetic circuit medium.
Due to selected iron core permeabilityμxTherefore, the magnetic resistance is very small, and the formula (1) can be simplified as follows:
in the formula: ry＝ly/μy·syRepresented as external magnetic circuit reluctance.
When the instrument sensor enters a magnetic medium from a non-magnetic medium, the change (or increment) Delta L of self-inductance of the induction coil caused by the change of the external magnetic medium is as follows:
ΔL＝L-L0＝4πN2(μ-μ0)·s/l＝(4πN)2·k·s/l (3)
in the formula: mu.s 01 is the magnetic conductivity of the well mud and the non-magnetic medium;
and mu-1 +4 pi k, mu and k are respectively medium permeability and magnetic susceptibility.
The change of the magnetic resistance in the medium is mainly determined by the magnetic permeability mu of the medium, when the change of the magnetic resistance is small, the s and the L can be regarded as constants, so that the increment delta L of the self-inductance of the coil is proportional to the magnetic susceptibility k of the medium according to the formula (3).
The iron core wound with the coil is connected into an alternating current bridge as a sensitive element and is used as one arm of the alternating current bridge, the phase-sensitive detectors are used for respectively measuring output voltages generated by magnetic permeability and conductivity change with different phases, the voltage generated by measuring the magnetic permeability is a magnetic susceptibility well logging, and the voltage generated by measuring the conductivity is an induction well logging; both of which can be measured separately.
Since the influence of the conductivity is also a disturbance to the susceptibility measurement, the susceptibility measurement must be performed by lowering the frequency of the alternating current and improving the design of the sensitive element to reduce the disturbance. When the impedance change Δ Z is Δ R + j Δ L, the output potential difference Δ V is Δ VR+ΔVLTwo parts, the phases of which are different by 90 degrees, measure delta V by using a phase sensitive detectorLThrough experimental calibration, the relationship between the magnetic susceptibility value k and the measured output voltage (unit volt) value V can be obtained as follows:
k＝(a0+a1V1+a2V2+a3V3+a4V4+a5V5)×10-4SI (4)
in the formula: a is0、a1、a2、a3、a4、a5Are all expressed as coefficients of a polynomial, which coefficients have to be experimentally determined to be specific values.
When comsol simulation analysis and data analysis obtained by field experiments are carried out on the susceptibility probe, the voltage value of the susceptibility probe is found to be smaller and smaller along with the increase of the well diameter until the voltage value is finally constant. However, as the susceptibility probe approaches the borehole wall, and even finally approaches the borehole wall, the voltage value of the susceptibility probe is substantially close to the true value. The disadvantage of the susceptibility probe is that it is only suitable for susceptibility measurements with a well diameter slightly larger than the diameter of the instrument itself, which can lead to large errors if the instrument is still positioned in the center of the well for measurement if the well diameter is much larger than the diameter of the instrument itself. However, by holding the tool against the borehole wall during measurements at larger borehole diameters, such errors are greatly reduced.
Disclosure of Invention
An object of the utility model is to provide an improve stable structure of magnetic susceptibility probe measuring instrument degree of accuracy in well for when improving current magnetic susceptibility probe and measure the rock magnetic susceptibility in the well, if the well diameter is a lot of bigger than the diameter of magnetic susceptibility probe itself, the great problem of magnetic susceptibility error that so measured.
The utility model aims at realizing through the following technical scheme:
the utility model provides an improve stable structure of magnetic susceptibility probe tube measuring instrument degree of accuracy in well which characterized in that: the device is composed of 1 cylinder-shaped external supporting device and 1 susceptibility probe measuring instrument 2, wherein the cylinder-shaped external supporting device is fixed in the middle of the shell of the susceptibility probe measuring instrument 2;
the cylindrical external supporting device consists of a cylindrical shell 6, a spring 7, a round button 8 and an arc-shaped buckling plate 9; the spring 7 is positioned in the cylindrical shell 6, one end of the spring 7 is fixed with the cylindrical shell 6, and the other end of the spring is freely telescopic; the round button 7 is fixedly extruded with the cylindrical shell 6 through a buckling plate, and the rear end of the round button 8 penetrates through the cylindrical shell 6 to be in contact with the free end of the spring 7; the buckling plate 9 is fixed with the side surface of the cylindrical shell 6;
the diameter of the inner circle of the cylindrical shell 6 is matched with the outer diameter of the susceptibility probe measuring instrument 2; the outer diameter of the spring 7 is matched with the diameter of the inner circle of the side surface of the cylindrical shell 6; the diameter of the circular button 7 is matched with the diameter of the inner circle of the buckling plate 9.
Furthermore, be equipped with 2 first drilling on the magnetic susceptibility probe measuring instrument 2, be equipped with 2 second drilling that match with first drilling on the cylinder type casing 6, first drilling and second drilling pass through screwed connection.
Further, be equipped with 2 third drilling on the cylinder type casing 6, be equipped with 2 fourth drilling that match with the third drilling on the arc fishplate bar 9, third drilling and fourth drilling pass through screwed connection.
Further, the cylindrical shell 6 and the fastening plate 9 are made of high-performance resin materials.
Further, the spring 7 is made of non-magnetic stainless steel material.
Further, the circular button 8 is made of pure copper material.
Further, the inner circle diameter of the cylinder-type housing 6 is 50 mm.
Further, the height of the cylinder-type housing 6 is 100 mm.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the utility model adopts the cylindrical external supporting device, which well solves the problem that the magnetic susceptibility value measured by the magnetic susceptibility probe is much smaller than the true value because the well diameter is too large when the existing magnetic susceptibility probe measures rock ore in the well; the cylindrical external supporting device can enable the instrument to be tightly attached to the well wall, so that the measurement precision of the susceptibility probe tube facing a large well diameter is improved; through circular button and spring, the effectual problem of having avoided causing the instrument to block because of having the unevenness of small part in the well has strengthened the whole measurability of instrument in the well.
Drawings
FIG. 1 is a diagram of the structural features of a prior art susceptibility probe;
FIG. 2 is a schematic diagram illustrating a magnetic susceptibility probe measurement principle in the prior art;
FIG. 3 is a schematic diagram of a prior art susceptibility probe;
FIG. 4 is a schematic structural view of the cylindrical external supporting device of the present invention;
FIG. 5 is a schematic view of the internal structure of the cylindrical external supporting device and the magnetic susceptibility probe of the present invention;
fig. 6 is a schematic front view of the present invention;
fig. 7 is a schematic diagram of the position relationship between the cylindrical external supporting device and the magnetic susceptibility probe according to the present invention.
In the figure: 1. the magnetic susceptibility probe comprises a power supply and signal interface 2, a magnetic susceptibility probe measuring instrument 3, a measuring circuit 4, a magnetic core 5, a sensing coil 6, a cylindrical shell 7, a spring 8, a circular button 9, a buckling plate 10, a first drilling hole 11, a third drilling hole 12, a second drilling hole 13 and a fourth drilling hole.
Detailed Description
The embodiments of the present invention will be described in detail with reference to the accompanying drawings, and other advantages and effects of the invention can be easily understood by those skilled in the art from the disclosure of the present specification.
It should be understood that the structure, ratio, size and the like shown in the drawings attached to the present specification are only used for matching with the content disclosed in the specification, so as to be known and read by those skilled in the art, and are not used for limiting the limit conditions that the present invention can be implemented, so that the present invention has no technical essential meaning, and any structure modification, ratio relationship change or size adjustment should still fall within the scope that the technical content disclosed in the present invention can cover without affecting the function that the present invention can produce and the purpose that the present invention can achieve. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle", and the like used in the present specification are for the sake of clarity only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are also considered to be the scope of the present invention without substantial changes in the technical content.
As shown in fig. 7, the stable structure for improving the accuracy of the magnetic susceptibility probe tube measuring instrument in the well of the present invention comprises 1 cylindrical external supporting device, wherein the cylindrical external supporting device comprises a cylindrical shell 6, a spring 7, a circular button 8 and an arc-shaped fastening plate 9; the cylinder type shell 6 is fixed in the middle of the shell of the susceptibility probe tube measuring device 2, and specifically: the cylindrical housing 6 and the susceptibility probe 2 pass through the first bore 10 and are fixed by screws.
The circular button 8 and the cylindrical shell 6 are extruded and fixed through an arc buckling plate 9; the buckling plate 9 and the cylindrical shell 6 pass through a third drilling hole 11 and are fixed by screws.
In an embodiment of the present invention, as shown in fig. 6, 2 second drill holes 10 are provided on the cylindrical housing 6, 2 first drill holes 13 matching with the second drill holes 10 are provided on the magnetic susceptibility probe measuring device 2, and the first drill holes 13 and the second drill holes 10 are connected by screws; be equipped with 2 third drilling 11 on the cylinder body type casing 6, be equipped with 2 fourth drilling 13 that match with third drilling 11 on the arc fishplate bar 9, third drilling 11 and fourth drilling 13 pass through screwed connection.
As shown in fig. 4, the cylinder-type external supporting device is composed of a cylinder-type housing 6, a circular button 8, a fastening plate 9 and a spring 7; the spring 7 is arranged in a circular hole on the side surface of the cylindrical shell 6; the round button 8 is fixedly extruded with the cylindrical shell 6 through a buckling plate 9, and the rear end of the round button 8 penetrates through the cylindrical shell 6 to be in contact with the free end of the spring 7; the buckle plate 9 is in contact with the round button 8 and is connected with the side face of the cylindrical shell 6 through a drill hole, and the problem that an instrument is clamped due to local unevenness in a well is solved.
In an embodiment of the present invention, the circular button 8 is a button made of pure copper material; the spring 7 is made of non-magnetic stainless steel material; the cylindrical shell 6 and the buckling plate 9 are made of high-performance resin materials.
The utility model discloses an embodiment, circle diameter is 50mm in the cylinder type casing 6.
In one embodiment of the present invention, the height of the cylindrical shell 6 is 100 mm.
Although the invention has been described in detail with respect to the general description and the specific embodiments, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (8)
1. The utility model provides an improve stable structure of magnetic susceptibility probe tube measuring instrument degree of accuracy in well which characterized in that: the device is composed of 1 cylinder-shaped external supporting device and 1 susceptibility probe measuring instrument (2), wherein the cylinder-shaped external supporting device is fixed in the middle of the shell of the susceptibility probe measuring instrument (2);
the cylindrical external supporting device consists of a cylindrical shell (6), a spring (7), a round button (8) and an arc buckling plate (9); the spring (7) is positioned inside the side face of the cylindrical shell (6), one end of the spring (7) is fixed with the cylindrical shell (6), and the other end of the spring is freely telescopic; the round button (8) is fixedly extruded with the cylindrical shell (6) through a buckling plate (9), and the rear end of the round button (8) penetrates through the cylindrical shell (6) to be in contact with the free end of the spring (7); the buckling plate (9) is fixed with the side surface of the cylindrical shell (6);
the inner circle diameter of the cylindrical shell (6) is matched with the outer diameter of the magnetic susceptibility probe tube measuring instrument (2); the outer diameter of the spring (7) is matched with the diameter of the inner circle of the side surface of the cylindrical shell (6); the diameter of the button (8) is matched with the diameter of the inner circle of the buckling plate (9).
2. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the magnetic susceptibility probe tube measuring instrument is characterized in that 2 first drill holes (10) are formed in the magnetic susceptibility probe tube measuring instrument (2), a plurality of second drill holes (12) matched with the first drill holes (10) are formed in the cylindrical shell (6), and the first drill holes (10) are connected with the second drill holes (12) through screws.
3. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: be equipped with 2 third drilling (11) on cylinder type casing (6), be equipped with a plurality of fourth drilling (13) that match with third drilling (11) on buckle plate (9), third drilling (11) and fourth drilling (13) pass through screwed connection.
4. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the cylindrical shell (6) and the buckling plate (9) are both made of high-performance resin materials.
5. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the spring (7) is made of non-magnetic stainless steel materials.
6. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the button (8) is made of pure copper material.
7. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the diameter of the inner circle of the cylindrical shell (6) is 50 mm.
8. The stable structure for improving the accuracy of a magnetic susceptibility probe measuring instrument in a well according to claim 1, wherein: the height of the cylindrical shell (6) is 100 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021227308.7U CN212207696U (en) | 2020-06-29 | 2020-06-29 | Stable structure for improving accuracy of magnetic susceptibility probe tube measuring instrument in well |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021227308.7U CN212207696U (en) | 2020-06-29 | 2020-06-29 | Stable structure for improving accuracy of magnetic susceptibility probe tube measuring instrument in well |
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| Publication Number | Publication Date |
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| CN212207696U true CN212207696U (en) | 2020-12-22 |
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| CN202021227308.7U Active CN212207696U (en) | 2020-06-29 | 2020-06-29 | Stable structure for improving accuracy of magnetic susceptibility probe tube measuring instrument in well |
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