CN113266342A - Signal wireless transmitting device - Google Patents
Signal wireless transmitting device Download PDFInfo
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- CN113266342A CN113266342A CN202110690576.5A CN202110690576A CN113266342A CN 113266342 A CN113266342 A CN 113266342A CN 202110690576 A CN202110690576 A CN 202110690576A CN 113266342 A CN113266342 A CN 113266342A
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- coil
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- solenoid
- shaped conductor
- drill rod
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a signal wireless transmitting device, and belongs to the field of signal wireless communication. Comprises a signal generator, a coil-shaped conductor, an insulating medium, a first transmission line and a second transmission line; the signal generator is cylindrical and is nested and arranged outside the drill rod; the coil type conductor comprises two sections of conductors which are circumferentially arranged on the outer side of the drill rod, wherein the first section is a cylindrical conductor, and the second section is a solenoid-shaped conductor; the solenoid-shaped conductor comprises a plurality of turns of coils, and gaps exist among the turns of coils; insulating media are filled between the coil-shaped conductor and the drill rod and in each coil gap of the solenoid-shaped conductor; the signal generator is connected with the drill rod through a first transmission line and connected with the coil-shaped conductor through a second transmission line. According to the invention, by optimizing the structure of the transmitting device and using the slurry-drill rod as a signal transmission channel, the swelling of the underground device and the interference of drilling operation are avoided, the structure is simple, the installation is convenient, the installation and the descending difficulty of the device are reduced to a certain extent, and the equipment cost is reduced.
Description
Technical Field
The invention belongs to the field of signal wireless communication, and particularly relates to a signal wireless transmitting device.
Background
The ground-underground communication is a key component for realizing the informatization and the intellectualization of the oil field. Because real-time near-bit data needs to be acquired during drilling, and the bit is in a high-speed rotating state during drilling, a wired communication mode is unavailable, and therefore, short-distance wireless transmission of near-bit signals is the key point of current research. At present, the technologies adopted for measurement while drilling data transmission mainly include mud pulse, electromagnetic wave wireless technology and the like.
Wireless transmission techniques using mud pulsing are well established and widely used in production sites. China also has a plurality of manufacturers and research units with the technology and the capability of producing commercial products. The main drawbacks of this technique include: the transmission rate is low and is generally within 10 bits/s; there is a dependence on drilling fluids, i.e. drilling fluids which must be liquid are used in production. The lower data transmission rate can not meet the requirements of underground multi-parameter and large data volume transmission, and the dependence on the drilling fluid can not be used in occasions using under-balanced drilling technologies such as air drilling technology and foam drilling technology. In addition, the volume of a pressure pulse generating mechanism is large, so that the pressure pulse generating mechanism can hardly be applied to a near-bit environment.
Wireless transmission technology using electromagnetic waves has been available from a number of companies abroad to provide commercial products. The technology has the main advantages of no dependence on drilling fluid, no movable part in the launching device, simple structure and application in near-bit environment. The method has the disadvantages that the method has requirements on the resistivity of the stratum, namely, the transmission speed and the transmission effect of the stratum are influenced when the resistivity of the stratum changes or does not meet the requirements; in addition, the data transmission rate is not high, and is generally within 20 bits/s.
Disclosure of Invention
Aiming at the defects of the related art, the invention aims to provide a signal wireless transmitting device, aiming at solving the problems that the existing near-drilling short-transmission signal wireless transmission rate is not high and the application occasion is limited.
In order to achieve the above object, the present invention provides a signal wireless transmitting apparatus, including: the signal generator, the coil-type conductor, the insulating medium, the first transmission line and the second transmission line; the signal generator is cylindrical and is nested and arranged on the outer side of the drill rod; the coil type conductor comprises two sections of conductors which are circumferentially arranged on the outer side of the drill rod, wherein the first section is a cylindrical conductor, and the second section is a solenoid-shaped conductor; the solenoid-shaped conductor comprises a plurality of turns of coils, and gaps exist among the turns of coils; the insulating medium is filled between the coil-shaped conductor and the drill rod and in each coil gap of the solenoid-shaped conductor; the signal generator is connected with the drill rod through the first transmission line, and the signal generator is connected with the coil-type conductor through the second transmission line.
Further, the signal generator, the cylindrical conductor and the solenoid-shaped conductor are arranged in sequence in a direction away from the drill bit.
Further, the number of turns of the coil of the solenoid-shaped conductor is greater than or equal to 3.
Further, the turn-to-turn distance of each turn in the solenoid-shaped conductor
Wherein the content of the first and second substances,
is the helix radius of the solenoid conductor, f is the communication frequency, and c is the speed of light.
Further, the communication frequency
。
Further, the outer side of the insulating medium is cylindrical.
Further, the insulating medium is a Peek material.
Compared with the prior art, the technical scheme of the invention has the advantages that the transmitting device structure is optimally designed, the mud-drill rod is used as a signal transmission channel, the swelling of the underground device is avoided, the interference of drilling operation is avoided, the structure is simple, the installation is convenient, the installation and the descending difficulty of the device are reduced to a certain extent, and the equipment cost is reduced. In addition, the invention improves the wireless transmission distance of the drill bit signal in the existing logging-while-drilling process and increases the wireless transmission precision.
Drawings
FIG. 1 is a schematic cross-sectional view of the overall structure of an apparatus according to an embodiment of the present invention.
Fig. 2 is a schematic structural view of a coil-type conductor in the embodiment of the present invention.
Reference numerals:
1-drilling mud; 2-a drill bit; 3-a metal drill pipe; 4-a signal generator; 5-a coil-type conductor; 6-insulating medium.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Since the refractive index of the mud is much higher than the surrounding soil, the drill pipe coated with drilling mud can be used as a single conductor transmission line, which can support TM surface waves. The surface wave is propagated along the metal pipeline, and spherical wave propagation path loss does not exist, so that the electromagnetic signal transmission by using the mud and the metal drill pipe is possible.
The invention provides a signal wireless transmitting device, comprising: the signal generator, the coil-type conductor, the insulating medium, the first transmission line and the second transmission line; the signal generator is cylindrical and is nested and arranged on the outer side of the drill rod; the coil type conductor comprises two sections of conductors which are circumferentially arranged on the outer side of the drill rod, wherein the first section is a cylindrical conductor, and the second section is a solenoid-shaped conductor; the solenoid-shaped conductor comprises a plurality of turns of coils, and gaps exist among the turns of coils; the insulating medium is filled between the coil-shaped conductor and the drill rod and in each coil gap of the solenoid-shaped conductor; the signal generator is connected with the drill rod through the first transmission line, and the signal generator is connected with the coil-type conductor through the second transmission line.
Further, the signal generator, the cylindrical conductor and the solenoid-shaped conductor are arranged in sequence in a direction away from the drill bit.
Further, the number of turns of the coil of the solenoid-shaped conductor is greater than or equal to 3.
Further, the turn-to-turn distance of each turn in the solenoid-shaped conductor
Wherein the content of the first and second substances,
is the helix radius of the solenoid conductor, f is the communication frequency, and c is the speed of light.
Further, the communication frequency
。
Further, the outer side of the insulating medium is cylindrical.
Further, the insulating medium is a Peek material.
The contents of the above embodiments will be described with reference to a preferred embodiment.
Aiming at the structure that mud is wrapped outside a metal drill pipe in a well during drilling, the embodiment of the invention provides a near-drilling short-distance transmission signal wireless transmitting device based on a mud-metal drill pipe channel, which is shown in figure 1 and comprises: a signal generator 4, a coil-type conductor 5, a transmission line (not shown in the figure) and an insulating medium 6.
The signal generator 4 is a cylindrical hollow device and is nested and arranged on the outer side of the metal drill rod.
In this embodiment, the signal generator 4 is installed at the end, close to the drill bit 2, of the metal drill rod 3, and is close to the sensor at the drill bit, so that the near-bit side detection data can be conveniently received through cables and other modes, and the codes are sent outwards.
As shown in fig. 2, the coil-type conductor 5 is formed by connecting a cylindrical conductor and a solenoid-type conductor, and is inserted and mounted outside the metal drill 3. The solenoid type conductor includes a plurality of turns of a coil with a gap between each turn of the coil.
The spiral radius of the solenoid-type conductor is recorded as
The distance between turns is
The communication frequency is f and the light speed is c. Then, it can be calculated that the theoretical equivalent wavelength of the electromagnetic wave is as follows:
preferably, to achieve efficient axial propagation of electromagnetic waves,
。
preferably, the turn-to-turn distance is taken as:
preferably, in order to make the electromagnetic wave attenuate slowly, the communication frequency can be selected to be 6 Mhz.
Spiral radius of solenoid type conductor
Slightly larger than the outer diameter of the drill rod, and a certain space is reserved for an insulating medium between the drill rod and the conductorAnd (6) filling the substances.
Preferably, the number of turns N of the solenoid-type conductor is 3 or more.
In this embodiment, the signal generator 4 sends data through two transmission lines, one connected to the metal drill pipe 3 and the other connected to the cylindrical conductor of the coil-type conductor 5.
The coil-type conductor 5 is installed above and adjacent to the signal generator 4 in this embodiment, so that the signal generator 4 and the coil-type conductor 5 are connected through a transmission line.
In this embodiment, the insulating medium 6 is a cylindrical dielectric medium for wrapping the coil-type conductor, and is filled between the coil-type conductor and the metal drill rod and between turns of the solenoid-type conductor.
Preferably, the insulating medium is made of a peek material, the lower end of the inner side of the insulating medium is aligned with the lower end of the cylindrical conductor, and the upper end of the insulating medium is slightly higher than the solenoid-type conductor, so that the coil-type conductor is stabilized and the electrical isolation between the coil-type conductor and the drill rod is realized.
The basic principle of the device is as follows: the signal generator 4 supplies power to the coil-type conductor 5, an electric field is generated through turn-to-turn gaps of the solenoid-type conductor, a magnetic field is generated through current flowing on the solenoid-type conductor and the metal drill rod 3, namely electromagnetic waves with mixed TM and TE modes are emitted along the axial direction of the drill rod, and then the electromagnetic waves with the TM mode are transmitted to the ground through a conducting wire structure formed by the drilling mud 1 and the drill rod.
The TE mode electromagnetic wave has a magnetic field component but no electric field component in the propagation direction; the TM mode electromagnetic wave has an electric field component in the propagation direction and no magnetic field component.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (7)
1. A wireless signal transmitting apparatus, comprising: the signal generator, the coil-type conductor, the insulating medium, the first transmission line and the second transmission line;
the signal generator is cylindrical and is nested and arranged on the outer side of the drill rod;
the coil type conductor comprises two sections of conductors which are circumferentially arranged on the outer side of the drill rod, wherein the first section is a cylindrical conductor, and the second section is a solenoid-shaped conductor; the solenoid-shaped conductor comprises a plurality of turns of coils, and gaps exist among the turns of coils;
the insulating medium is filled between the coil-shaped conductor and the drill rod and in each coil gap of the solenoid-shaped conductor;
the signal generator is connected with the drill rod through the first transmission line, and the signal generator is connected with the coil-type conductor through the second transmission line.
2. The wireless signal transmission device according to claim 1, wherein the signal generator, the cylindrical conductor and the solenoid-shaped conductor are arranged in this order in a direction away from the drill bit.
3. The wireless signal transmitting device of claim 1, wherein the number of coil turns of the solenoid-shaped conductor is 3 or more.
4. The wireless signal transmitting device of claim 3, wherein the distance between turns of each turn of the solenoid-shaped conductor
Wherein the content of the first and second substances,
is the helix radius of the solenoid conductor, f is the communication frequency, and c is the speed of light.
5. The wireless signal transmitting device as claimed in claim 4, wherein said communication frequency is set to
。
6. The signal wireless transmission apparatus of claim 1, wherein an outer side of the insulating medium is cylindrical.
7. The wireless signal transmitting device as claimed in claim 1 or 6, wherein the insulating medium is a Peek material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110690576.5A CN113266342B (en) | 2021-06-22 | 2021-06-22 | Signal wireless transmitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110690576.5A CN113266342B (en) | 2021-06-22 | 2021-06-22 | Signal wireless transmitting device |
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| CN113266342A true CN113266342A (en) | 2021-08-17 |
| CN113266342B CN113266342B (en) | 2022-05-17 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033673A (en) * | 1987-10-30 | 1989-07-05 | 施卢默格海外有限公司 | Well logging apparatus and method |
| CN101806210A (en) * | 2010-04-13 | 2010-08-18 | 中国石油大学(北京) | System using solenoid groups to achieve electromagnetic guiding distance measurement while drilling |
| CN102704918A (en) * | 2012-05-02 | 2012-10-03 | 王传伟 | Connecting device for well bore signal transmission |
| US20170362930A1 (en) * | 2016-06-21 | 2017-12-21 | The Regents Of The University Of Michigan | Compact single conductor transmission line transducer for telemetry in borehole drilling |
| CN109826618A (en) * | 2019-01-10 | 2019-05-31 | 中国石油天然气集团有限公司 | A kind of NMR RF coil that can be used under high-salinity mud Drilling Fluid Conditions |
| CN111577259A (en) * | 2020-05-25 | 2020-08-25 | 华中科技大学 | Double-resonance near-bit signal short transmission system |
-
2021
- 2021-06-22 CN CN202110690576.5A patent/CN113266342B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033673A (en) * | 1987-10-30 | 1989-07-05 | 施卢默格海外有限公司 | Well logging apparatus and method |
| CN101806210A (en) * | 2010-04-13 | 2010-08-18 | 中国石油大学(北京) | System using solenoid groups to achieve electromagnetic guiding distance measurement while drilling |
| CN102704918A (en) * | 2012-05-02 | 2012-10-03 | 王传伟 | Connecting device for well bore signal transmission |
| US20170362930A1 (en) * | 2016-06-21 | 2017-12-21 | The Regents Of The University Of Michigan | Compact single conductor transmission line transducer for telemetry in borehole drilling |
| CN109826618A (en) * | 2019-01-10 | 2019-05-31 | 中国石油天然气集团有限公司 | A kind of NMR RF coil that can be used under high-salinity mud Drilling Fluid Conditions |
| CN111577259A (en) * | 2020-05-25 | 2020-08-25 | 华中科技大学 | Double-resonance near-bit signal short transmission system |
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| CN113266342B (en) | 2022-05-17 |
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