CN203535240U

CN203535240U - Antenna device

Info

Publication number: CN203535240U
Application number: CN201320712758.9U
Authority: CN
Inventors: 郭巍; 李智强; 李郴
Original assignee: China Research Institute of Radio Wave Propagation CRIRP
Current assignee: China Research Institute of Radio Wave Propagation CRIRP
Priority date: 2013-11-12
Filing date: 2013-11-12
Publication date: 2014-04-09
Anticipated expiration: 2023-11-12

Abstract

The utility model provides an antenna device. The antenna device comprises a housing (10) and a probe set (20), wherein the housing is provided with an inner cavity and an open surface communicated with the inner cavity; and the probe set is installed in the inner cavity of the housing (10), a certain distance exists between the probe set and the open surface, and the probe set (20) comprises a first probe (21) and a second probe (22) which are arranged in an intersection manner and are separated from each other. By adopting the technical scheme of the utility model, electromagnetic fields with any polarization angle are excited in the plane of the first probe and the second probe by respectively adjusting amplitudes and phases of excitation signals in two channels, the phase change and the amplitude attenuation in different polarized directions under different stratum environments are detected by transmit-receive antenna arrays, and the stratum information in corresponding polarized direction is obtained by inversion calculation.

Description

Antenna assembly

Technical field

The utility model relates to oil well logging field of engineering technology, in particular to a kind of antenna assembly.

Background technology

In oil well logging field of engineering technology, relate to a kind of antenna, for measuring the specific inductive capacity on stratum.Because the measurement of specific inductive capacity can more simply be distinguished oil, G&W layer than other means, in recent years near the measurement of stratum dielectric constant well is more and more come into one's own.

In prior art, a kind of device of typical measurement stratum dielectric constant, as US Patent No. 3944910, has wherein been described Schlumberger(Schlumberger) a kind of instrument EPT(electromagnetic wave propagation logging instrument of company).The antenna using in EPT, for back of the body chamber slot antenna, can be measured time and decay that electromagnetic wave is propagated in stratum near well.The ADEPT(adjustable electric magnetic wave propagation well logger of EPT and development afterwards) problem existing is that they only have a secondary dual-mode antenna, only can measure the formation information of a polarised direction.

Utility model content

The utility model aims to provide a kind of antenna assembly, to solve the problem that only can measure the formation information of a polarised direction in prior art.

To achieve these goals, the utility model provides a kind of antenna assembly to comprise: housing, the opening surface that has inner chamber and be communicated with inner chamber; Probe groups, is arranged in the inner chamber of housing and has distance with opening surface place, and probe groups comprises and intersects the first probe and the second probe that arranges and be separated from each other.

Further, antenna assembly also comprises the first coaxial cable, the second coaxial cable, the first web member and the second web member, and housing has installs the second installation passage that first of the first coaxial cable is installed passage and the second coaxial cable is installed; The first first end and the second first end that passage is installed that passage is installed is all communicated with inner chamber, the first the second end and second the second end that passage is installed that passage is installed all passes housing, the first web member is arranged on the second end of the first installation passage, and the second web member is arranged on the second end of the second installation passage; The first end of the first coaxial cable is connected with the first end of the first probe, the first end of the second coaxial cable is connected with the first end of the second probe, the second end of the first coaxial cable is fixed by the first web member, the second end of the second coaxial cable is fixed by the second web member, and the second end of the first probe and the second end of the second probe are all fixedly mounted on the inwall of housing.

Further, the first web member and the second web member are radio-frequency (RF) coaxial joint.

Further, antenna assembly also comprises medium, and Filled Dielectrics is in the inner chamber of housing.

Further, medium is glass material or stupalith.

Further, antenna assembly also comprises the first impedance matching unit and the second impedance matching unit, and the first impedance matching unit is connected with the first web member, and the second impedance matching unit is connected with the second web member.

Further, antenna assembly also comprises O-ring seal, on the outer peripheral face of housing, has ring groove, and O-ring seal is arranged in ring groove.

Further, the inner wire of the first coaxial cable is electrically connected to the first end of the first probe, and the inner wire of the second coaxial cable is electrically connected to the first end of the second probe.

Further, the first end of the first end of the first probe and the second probe all shrinks gradually and stretches out.

Further, the first probe is mutually vertical with the second probe.

Further, the middle part of the first probe has the first groove, and the middle part of the second probe has the second groove, the bottom land of the bottom land of the first groove and the second groove be oppositely arranged and the bottom land of the first groove and the bottom land of the second groove between there is gap.

Application the technical solution of the utility model, be provided with probe groups, this probe groups comprises crossing the first probe and the second probe that arranges and be separated from each other, like this, the parallel plane electromagnetic field of arbitrary polarisation direction and the first probe 21 and the second probe 22 places can be launched separately or receive to antenna assembly, by receiving the specific inductive capacity of measuring anisotropic formation with transmission antenna device.Particularly, by adjusting respectively the amplitude of excitation signals and phase place, can play at the first probe and the second probe place plane underexcitation the electromagnetic field of any polarizing angle, by dual-mode antenna battle array, measure like this phase change and the amplitude fading of different polarised directions under Different Strata environment, and then can obtain through Inversion Calculation the formation information of corresponding polarised direction.

Accompanying drawing explanation

The Figure of description that forms the application's a part is used to provide further understanding of the present utility model, and schematic description and description of the present utility model is used for explaining the utility model, does not form improper restriction of the present utility model.In the accompanying drawings:

Fig. 1 shows the sectional structure schematic diagram according to the embodiment of antenna assembly of the present utility model;

Fig. 2 shows the part-structure schematic top plan view of the antenna assembly of Fig. 1;

Fig. 3 shows the schematic diagram that the first probe of the antenna assembly of Fig. 2 is energized;

Fig. 4 shows the schematic diagram that the second probe of the antenna assembly of Fig. 2 is energized;

Fig. 5 shows the first probe of antenna assembly of Fig. 2 and the schematic diagram that the second probe is energized simultaneously;

Fig. 6 shows two structural representations of sending out three receipts antenna assembly arrays of the antenna assembly that comprises a plurality of Fig. 1; And

Fig. 7 shows two structural representations of sending out eight receipts antenna assembly arrays of the antenna assembly that comprises a plurality of Fig. 1.

Above-mentioned accompanying drawing comprises the following drawings mark:

10, housing; 20, probe groups; 21, the first probe; 22, the second probe; 30, the first coaxial cable; 31, inner wire; 40, the first web member; 50, the first impedance matching unit; 60, backup pole plate.

Embodiment

It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.Describe below with reference to the accompanying drawings and in conjunction with the embodiments the utility model in detail.

As shown in Figure 1, the antenna assembly of the present embodiment comprises housing 10 and probe groups 20.The opening surface that housing 10 has inner chamber and is communicated with inner chamber; Probe groups 20 is arranged in the inner chamber of housing 10 and has distance with opening surface place, and probe groups 20 comprises and intersects the first probe 21 and the second probe 22 that arranges and be separated from each other.The first probe 21 and the second probe 22 are all parallel to the opening surface of housing 10.

The antenna assembly of application the present embodiment, be provided with probe groups 20, this probe groups 20 comprises crossing the first probe 21 and the second probe 22 that arranges and be separated from each other, like this, the parallel plane electromagnetic field of arbitrary polarisation direction and the first probe 21 and the second probe 22 places can be launched separately or receive to antenna assembly, by receiving the specific inductive capacity of measuring stratum with transmission antenna device.Particularly, by adjusting respectively the amplitude of excitation signals and phase place, can play at the first probe 21 and the second probe 22 place plane underexcitations the electromagnetic field of any polarizing angle, by dual-mode antenna battle array, measure like this phase change and the amplitude fading of different polarised directions under Different Strata environment, and then can obtain through Inversion Calculation the formation information of corresponding polarised direction.

In the present embodiment, antenna assembly also comprises the first coaxial cable 30, the second coaxial cable, the first web member 40 and the second web member, and housing 10 has installs the second installation passage that first of the first coaxial cable 30 is installed passage and the second coaxial cable is installed; The first first end and the second first end that passage is installed that passage is installed is all communicated with inner chamber, the first the second end and second the second end that passage is installed that passage is installed all passes housing 10, the first web member 40 is arranged on the second end of the first installation passage, and the second web member is arranged on the second end of the second installation passage; The first end of the first coaxial cable 30 is connected with the first end of the first probe 21, the first end of the second coaxial cable is connected with the first end of the second probe 22, the second end of the first coaxial cable 30 is fixing by the first web member 40, the second end of the second coaxial cable is fixed by the second web member, and the second end of the second end of the first probe 21 and the second probe 22 is all fixedly mounted on the inwall of housing 10.Preferably, the second end of the second end of the first probe 21 and the second probe 22 is all welded on the inwall of housing 10.In the present embodiment, the first web member 40 and the second web member are radio-frequency (RF) coaxial joint.

In the present embodiment, the inner wire 31 of the first coaxial cable 30 is electrically connected to the first end of the first probe 21, and the inner wire of the second coaxial cable is electrically connected to the first end of the second probe 22.In the present embodiment, the first end of the first end of the first probe 21 and the second probe 22 all shrinks gradually and stretches out.Abrupt change for fear of the inner wire by thinner to step the first thicker probe 21 or the second probe 22, to the sudden change producing along line current, adopts conical gradual change mode to connect in the two coupling part.Certainly, the transient mode of connection is not limited to conical gradual change, as long as can make electromagnetic wave not produce the reliable gradual change connected mode of all can be used as of strong reflection in coupling part, as arc, parabolic type etc.

In the present embodiment, antenna assembly also comprises medium, and Filled Dielectrics is in the inner chamber of housing 10.Filled media sintering in housing 10 inner chambers.Because filled media part-structure is comparatively complicated, Filled Dielectrics step can be: first use resistant to elevated temperatures coaxial cable and resistant to elevated temperatures welding manner to overlap out total, and secondly to filled media in the space in housing 10, and integral sintered together with antenna assembly.The whole space that can fill so full housing 10, comprises very tiny space.Medium is sintered into an integral body with housing 10, can avoid the interface between the two to introduce air layer, and then can avoid electromagnetic wave in multilayered medium, to produce complicated reflection, refraction etc. simultaneously.Opening surface place at housing 10 also seals, and avoids the drilling fluids such as water or mud to enter antenna assembly inside under the high temperature and high pressure environment of down-hole.

In the present embodiment, medium is glass material or stupalith.Certainly, the material that medium also can be higher for other specific inductive capacity.

In the present embodiment, antenna assembly also comprises the first impedance matching unit 50 and the second impedance matching unit, and the first impedance matching unit 50 is connected with the first web member 40, and the second impedance matching unit is connected with the second web member.Particularly, at the input end of emitting antenna or at the output terminal of receiving antenna, increased impedance matching unit, after the impedance transformation of impedance matching unit, mated with the late-class circuit of certain characteristic impedance.After processing like this, antenna assembly can be worked in 20MHz-1.1GHz frequency range.Because the specific inductive capacity of the medium of filling is higher, in high band, can not use impedance matching unit since like this, directly make the Circuit Matching of antenna feed impedance and rear class characteristic impedance 50 Ω.Coupling in low-frequency range is also because the specific inductive capacity of filled media comparatively easily realizes impedance matching compared with high.In 20MHz-1.1GHz frequency range, the conventional lamped element of impedance matching unit is made, and in above-mentioned band limits, higher-frequency point also can adopt the elements with distributed parameters such as microstrip line to make.

In the present embodiment, antenna assembly also comprises O-ring seal, on the outer peripheral face of housing 10, has ring groove, and O-ring seal is arranged in ring groove.O-ring seal plays the effect of sealing at antenna assembly, make antenna assembly can bear the high temperature and high pressure environment of down-hole.Housing 10 adopts the higher metal material of conductance to make, as brass, alloy etc.In the outside of housing 10, have for the structure of O-ring seal is installed, an antenna assembly is arranged on by structures such as O-ring seals on the backup pole plate 60 of instrument, can realize independent disassembling and the installation of each antenna assembly.The structure of backup pole plate 60 also can be worked under the high temperature and high pressure environment of down-hole.

In the present embodiment, as shown in Figure 2, the first probe 21 is mutually vertical with the second probe 22.The first probe 21 and the mutual vertical placement of the second probe 22 in housing 10, can be for the mutually orthogonal electromagnetic field of exciting electrode direction.

In the present embodiment, because the first probe 21 and the second probe 22 are placed in same plane, for fear of electrically contacting, at the first probe 21 and the second crossing position of probe 22, groove is set, the middle part of the first probe 21 has the first groove, and the middle part of the second probe 22 has the second groove.In order to make the first probe 21 intersect but not contact with the second probe 22, the bottom land of the bottom land of the first groove and the second groove be oppositely arranged and the bottom land of the first groove and the bottom land of the second groove between there is gap.In order to make not produce sudden change along line current, can adopt circular arc or other gradual mode of grooving such as parabola shaped.Preferably, the first probe 21 and the second probe 22 are cylindrical.Certainly, the first probe and the second probe also can rectangle schistose textures.

The probe groups 20 of antenna assembly provides respectively the electromagnetic field of pairwise orthogonal polarised direction, as shown in Figures 3 to 5, is wherein with hypographous probe for being energized probe, and arrow represents direction of an electric field.As shown in Figure 5, when two probes are energized, adjust respectively amplitude and the phase place of excitation signals simultaneously, just can encourage the electromagnetic field of any polarizing angle in probe groups 20 planes.

Antenna assembly for dielectric tool is all realized to receive and dispatch array format conventionally, and receiving antenna device and transmission antenna device in transmitting-receiving array are above-mentioned antenna assembly.Fig. 6 and Fig. 7 have shown the distribution schematic diagram of dual-mode antenna apparatus array on backup pole plate 60.Antenna assembly array is comprised of at least one transmission antenna device and at least one receiving antenna device, and dual-mode antenna device, by regulating amplitude and the phase place of pumping signal to mate to reach polarization, receives and the identical object in polarization of ele angle of launching.Measure accordingly amplitude and phase place that receiving antenna device receives signal, obtain the anisotropic parameters of corresponding stratum under this kind of polarization.Certainly, the number that transmits and receives antenna assembly is not limited to shown in figure, common as shown in Figure 6 two send out three and receive two shown in antenna assembly arrays and Fig. 7 and send out eight and receive antenna assembly arrays, wherein, T1, T2 are transmission antenna device, and R1, R2, R3, R11, R12, R13, R14, R21, R22, R23, R24 are receiving antenna device.Accordingly, spacing between antenna assembly is also not limited to shown in figure, in order to reach investigation depth and the resolution of wanting, the spacing between antenna assembly can adjust accordingly, and also need not equidistantly arrange between receiving antenna device and between transmission antenna device.

The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for a person skilled in the art, the utility model can have various modifications and variations.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection domain of the present utility model.

Claims

1. an antenna assembly, is characterized in that, comprising:

Housing (10), the opening surface that there is inner chamber and be communicated with described inner chamber;

Probe groups (20), is arranged in the inner chamber of described housing (10) and has distance with described opening surface place, and described probe groups (20) comprises and intersects the first probe (21) and the second probe (22) that arranges and be separated from each other.

2. antenna assembly according to claim 1, is characterized in that,

Described antenna assembly also comprises the first coaxial cable (30), the second coaxial cable, the first web member (40) and the second web member, and described housing (10) has installs the second installation passage that first of described the first coaxial cable (30) is installed passage and described the second coaxial cable is installed;

The described first first end and the described second first end that passage is installed that passage is installed is all communicated with described inner chamber, the described first the second end and second the second end that passage is installed that passage is installed all passes described housing (10), described the first web member (40) is arranged on the second end of described the first installation passage, and described the second web member is arranged on the second end of described the second installation passage;

The first end of described the first coaxial cable (30) is connected with the first end of described the first probe (21), the first end of described the second coaxial cable is connected with the first end of described the second probe (22), the second end of described the first coaxial cable (30) is fixing by described the first web member (40), the second end of described the second coaxial cable is fixed by described the second web member, and the second end of the second end of described the first probe (21) and described the second probe (22) is all fixedly mounted on the inwall of described housing (10).

3. antenna assembly according to claim 2, is characterized in that, described the first web member (40) and the second web member are radio-frequency (RF) coaxial joint.

4. antenna assembly according to claim 1, is characterized in that, also comprises medium, and described Filled Dielectrics is in the inner chamber of described housing (10).

5. antenna assembly according to claim 4, is characterized in that, described medium is glass material or stupalith.

6. antenna assembly according to claim 2, it is characterized in that, also comprise the first impedance matching unit (50) and the second impedance matching unit, described the first impedance matching unit (50) is connected with described the first web member (40), and described the second impedance matching unit is connected with described the second web member.

7. antenna assembly according to claim 1, is characterized in that, also comprises O-ring seal, on the outer peripheral face of described housing (10), has ring groove, and described O-ring seal is arranged in described ring groove.

8. antenna assembly according to claim 2, it is characterized in that, the inner wire (31) of described the first coaxial cable (30) is electrically connected to the first end of described the first probe (21), and the inner wire of described the second coaxial cable is electrically connected to the first end of described the second probe (22).

9. antenna assembly according to claim 2, is characterized in that, the first end of the first end of described the first probe (21) and described the second probe (22) all shrinks gradually ground and stretches out.

10. antenna assembly according to claim 1, is characterized in that, described the first probe (21) is mutually vertical with described the second probe (22).

11. antenna assemblies according to claim 1, it is characterized in that, the middle part of described the first probe (21) has the first groove, the middle part of described the second probe (22) has the second groove, the bottom land of the bottom land of described the first groove and described the second groove be oppositely arranged and the bottom land of described the first groove and the bottom land of described the second groove between there is gap.