CN114526064A - Two-way wireless electromagnetic transmission device and method for cased well ground signal - Google Patents
Two-way wireless electromagnetic transmission device and method for cased well ground signal Download PDFInfo
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- CN114526064A CN114526064A CN202210419413.8A CN202210419413A CN114526064A CN 114526064 A CN114526064 A CN 114526064A CN 202210419413 A CN202210419413 A CN 202210419413A CN 114526064 A CN114526064 A CN 114526064A
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B47/00—Survey of boreholes or wells
- E21B47/12—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling
- E21B47/13—Means for transmitting measuring-signals or control signals from the well to the surface, or from the surface to the well, e.g. for logging while drilling by electromagnetic energy, e.g. radio frequency
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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 two-way wireless electromagnetic transmission device and a method for cased well ground signals, which belong to the technical field of oil and gas field development, wherein when underground data is uploaded, an upper short section I is used as an electromagnetic signal receiving short section, a lower short section II is used as an electromagnetic signal transmitting short section, and when a TM wave transmitting antenna in the short section II generates an alternating magnetic field in a magnetic core through alternating current, the magnetic core on the short section I of the electromagnetic signal receiving short section can capture the current signals to realize the uploading of the signals; in a similar way, when ground data is downloaded, nipple II is as electromagnetic signal receiving nipple, and nipple I is as electromagnetic signal transmitting nipple, and TM wave transmitting antenna in nipple I produces alternating magnetic field in the magnetic core through alternating current, catches current signal at nipple II and accomplishes signal download, the two-way transmission of the signal between nipple I and nipple II. Compared with the prior art, the receiving signal amplitude is larger and the carrier frequency is higher under the condition of transmitting the same distance.
Description
Technical Field
The invention relates to the technical field of oil and gas field development, in particular to a cased well ground signal bidirectional wireless electromagnetic transmission device and method.
Background
The method is used for monitoring reservoir fluid property parameters and performing well-to-ground bidirectional operation of underground measurement and control instrument equipment in the development process of an oil and gas field, and relies on the establishment of a well-to-ground bidirectional communication channel, for example, zonal exploitation is widely applied to the development and production of modern oil and gas fields, and whether the zonal fracturing of the oil and gas field, the later zonal water injection assisted exploitation and the production process monitoring of oil production and gas production, the state data of the reservoir and the underground equipment need to be known in real time to provide a reliable and real-time decision basis for development and production management, so that the method plays a vital role in improving an oil and gas collection process and oil and gas well management.
At present, the wireless uploading technology of downhole data mainly includes acoustic wave transmission, electromagnetic wave transmission and other modes. The electromagnetic-based wireless logging technology mostly adopts the current field type channel transmission principle to transmit signals. For example, in the patents CN103061755A, CN105178948A, and CN110111555A, the drill rod and the ground form an equivalent circuit to transmit electromagnetic signals. However, this transmission method has high requirements on the electrical parameters (conductivity, permittivity and permeability) of the formation, and is easily influenced by geological conditions and the migration of underground fluids.
And present wireless electromagnetic communication system in ground mainly used well logging, mainly there are transmitting device and receiving arrangement in the pit, cut the drilling rod with the insulating nipple joint, constitute insulating dipole transmitting antenna, with transmitting device's positive terminal, the upper end and the lower extreme of insulating nipple joint are received respectively to the negative terminal, excitation current on the positive terminal will flow upwards along the metal drilling rod of insulating nipple joint upper end, and can leak the stratum gradually along with the upwards extension electric current of drilling rod, adopt to bury ground the ground electrode and detect the leakage current who leaks in the stratum on ground, and then realize the transmission of signal.
In the prior art, a closed loop is formed by the ground to finish signal transmission, the method is unstable in signal transmission caused by changes of electrical parameters (conductivity, dielectric constant and magnetic permeability) of a stratum (different wells and different oil extraction periods of the same well), and the phenomena that communication is abnormal in a certain period of time and communication in an area A is normal and communication cannot be performed in an area B due to different stratum parameters usually occur, so that the universality is not high.
The prior art needs to form a closed loop depending on the groundThe transmission of the signal is realized because the transmission depth of the electromagnetic wave in the stratum is determined by the skin depth delta of the electromagnetic wave in the stratum, and the skin depth is determined by the skin depth
(p formation conductivity, f operating frequency), therefore, for deeper telemetry depth distances, a very low frequency (0.1 Hz-10 Hz) carrier is generally used for data transmission, which results in slow and inefficient data transmission rate.
Disclosure of Invention
The invention aims to provide a cased well ground signal bidirectional wireless electromagnetic transmission device and a cased well ground signal bidirectional wireless electromagnetic transmission method, which are used for uploading underground measurement and control signals in a narrow space of a metal casing, a metal oil pipe and a packer in an anisotropic complex formation environment and high-salinity oil casing annular ground water to the ground from the underground in a wireless electromagnetic mode and wirelessly downloading ground control instructions to underground measurement and control instrument equipment.
In order to solve the technical problem, the present application provides the following technical solutions:
a two-way wireless electromagnetic transmission device for a cased well ground signal comprises a casing arranged underground, and an oil pipe, a centralizer I, a nipple I, a packer, a nipple II, a sensor integrated nipple and a centralizer II which are arranged in the casing and sequentially connected from top to bottom; the centralizer I and the centralizer II are arranged up and down and are used for electrically connecting the casing and the oil pipe; the short section I is communicated with the short section II through electromagnetic signals, and signals between the short section I and the short section II are transmitted in a two-way mode.
As the further scheme of this application, nipple I all includes oil pipe, metal protection overcoat and sets up with nipple II group battery, transmission signal processing module and received signal processing module between oil pipe and the metal protection overcoat.
As the further scheme of this application, nipple joint II still includes TM (Transverse magnetic wave) wave transmitting antenna, and TM wave transmitting antenna comprises the soft magnetic material of annular and encircles the coil outside soft magnetic material.
As the further scheme of this application, nipple joint I still includes TM ripples receiving antenna, and TM ripples receiving antenna comprises magnetic core and the coil of high magnetic permeability.
As the further scheme of this application, transmission signal processing module includes sensor analog signal acquisition circuit (AD), coding module, modulation module, band-pass filter circuit module, power amplifier circuit module and transmitting current monitoring module, transmission signal processing module is used for producing modulation signal, modulation signal carries out sensor analog signal Acquisition (AD), coding and modulation by a microcontroller and obtains, power amplifier circuit and TM wave transmitting antenna electrical connection in the transmission signal processing module.
As the further scheme of this application, all be equipped with insulating material on nipple joint I and the nipple joint II and make the sealed cowling that is used for carrying out the encapsulation.
As the further scheme of this application, nipple II, the integrated nipple joint of sensor and oil pipe are connected through screwed joint, and the integrated nipple joint of sensor passes through cable transmission sensor signal with nipple II.
As a further aspect of the present application, the received signal processing module includes a signal filtering circuit and a voltage gain amplifying circuit, wherein the signal received by the received signal processing module is demodulated and decoded by the second microcontroller.
As a further scheme of the application, the oil pipe, the centralizer I, the sleeve and the centralizer II form an equivalent loop, wherein current flows from the oil pipe to the centralizer and flows back to a negative pole of the induced electromotive force.
As a further aspect of the present application, a cased well ground signal bidirectional wireless electromagnetic transmission method is based on the cased well ground signal bidirectional wireless electromagnetic transmission device, and includes the following steps:
step 1) when underground data is uploaded, the upper pup joint I is used as an electromagnetic signal receiving pup joint, the lower pup joint II is used as an electromagnetic signal transmitting pup joint, when a TM wave transmitting antenna in the pup joint II of the electromagnetic transmitting pup joint generates an alternating magnetic field in a magnetic core through alternating current, induced current is generated in the loop due to the fact that a metal oil casing pipe penetrating through the magnetic core of the transmitting antenna and a loop electrode or a packer form a conductor loop, and the magnetic core on the pup joint I of the electromagnetic signal receiving pup joint in the loop captures a current signal to achieve uploading of the signal;
step 2), when ground data is downloaded, the lower short section II is used as an electromagnetic signal receiving short section, the upper short section I is used as an electromagnetic signal transmitting short section, a TM wave transmitting antenna in the short section I of the electromagnetic transmitting short section generates an alternating magnetic field in a magnetic core through alternating current, the alternating magnetic field generates induced electromotive force on an oil pipe of the short section I of the electromagnetic signal transmitting short section, the current signal is captured by the short section II of the electromagnetic signal receiving short section to finish signal downloading, and the signals between the short section I and the short section II are transmitted in a two-way mode.
Compared with the prior art, the beneficial effects of this application are:
different with current wireless electromagnetic communication system in pit utilizes the earth return circuit to carry out signal transmission, the two-way wireless electromagnetic transmission device of cased hole ground signal of this application carries out electrical connection with oil pipe and sleeve pipe, utilizes oil pipe sleeve pipe metal return circuit to transmit electromagnetic signal, because metal resistivity is less than the stratum resistivity far away, and the amperage in the current return circuit is higher than the amperage of traditional technical current return circuit far away. Existing downhole wireless electromagnetic communication systems transmit in the formation primarily by virtue of the skin effect of leakage currents leaking into the formation. Therefore, compared with the prior art, the signal loop is realized based on the conductor loop instead of the stratum with the resistivity time-space variation, the received signal amplitude is larger and the carrier frequency is higher under the condition of transmitting the same distance, and the instability of transmission caused by different geological conditions can be avoided due to the fact that the signal loop is independent of the stratum.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a cased hole ground signal two-way wireless electromagnetic transmission device of the present application.
FIG. 2 is a schematic view of an elevational cross-sectional structure of a nipple II in the cased hole ground signal bidirectional wireless electromagnetic transmission device of the present application;
FIG. 3 is a schematic view of a front-view cross-sectional structure of a nipple I in the cased-hole ground signal bidirectional wireless electromagnetic transmission device of the present application;
FIG. 4 is a schematic top view of a cased hole ground signal two-way wireless electromagnetic transmission device according to the present application.
FIG. 5 is a schematic diagram of a method for bi-directional wireless electromagnetic transmission of cased hole signals in accordance with the present application.
The reference numerals in the figures illustrate:
1-casing pipe, 2-oil pipe, 3-centralizer I, 4-nipple I, 5-packer, 6-nipple II, 7-sensor integrated nipple, 8-cable, 9-centralizer II, 10-nipple I sealing cover, 11-battery pack II, 12-metal protection outer sleeve II, 13-transmitting signal processing module II, 14-receiving signal processing module II, 15-TM wave transmitting/receiving antenna II, 16-TM wave receiving/transmitting antenna I, 17-receiving signal processing module I, 18-transmitting signal processing module I, 19-metal protective outer sleeve I, 20-battery pack I, 21-short section II sealing cover, 22-first tap, 23-second tap and 24-third tap.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, an embodiment of the present application is shown:
a two-way wireless electromagnetic transmission device for a cased well ground signal comprises a casing 1 arranged underground, and an oil pipe 2, a centralizer I3, a nipple I4, a packer 5, a nipple II 6, a sensor integrated nipple 7 and a centralizer II 9 which are arranged in the casing 1 and sequentially connected from top to bottom; the centralizer I3 and the centralizer II 9 are arranged up and down, and the centralizer I3 and the centralizer II 9 are used for electrically connecting the casing 1 and the oil pipe 2; through electromagnetic signal intercommunication between nipple joint I4 and nipple joint II 6, the two-way transmission of the signal between nipple joint I4 and the nipple joint II 6, nipple joint I4 and nipple joint II 6 all include oil pipe 2, metal protection overcoat and set up group battery, transmission signal processing module, received signal processing module and TM ripples transmitting antenna between oil pipe 2 and the metal protection overcoat.
In the embodiment of the present application, the TM wave transmitting antenna is composed of a soft magnetic material in a loop shape and a coil wound outside the soft magnetic material.
The TM wave receiving antenna consists of a magnetic core with high magnetic permeability and a coil.
The transmitting signal processing module comprises a sensor analog signal acquisition circuit (A/D), a coding module, a modulation module, a band-pass filter circuit module, a power amplification circuit module and a transmitting current monitoring module, the transmitting signal processing module is used for generating a modulation signal, the modulation signal is obtained by acquiring (A/D), coding and modulating a sensor analog signal through a first microcontroller, and the power amplification circuit in the transmitting signal processing module is electrically connected with a TM wave transmitting antenna.
In the embodiment of this application all be equipped with insulating material on nipple I4 and the nipple II 6 and make the sealed cowling that is used for carrying out the encapsulation.
The nipple II 6, the sensor integrated nipple 7 and the oil pipe 2 are connected through threaded joints, and the sensor integrated nipple 7 and the nipple II 6 transmit sensor signals through a cable 8.
The received signal processing module comprises a signal filtering circuit and a voltage gain amplifying circuit, wherein the signal received by the received signal processing module is demodulated and decoded by the second microcontroller.
The oil pipe 2, the centralizer I3, the sleeve 1 and the centralizer II 9 form an equivalent loop in which current flows from the oil pipe 2 to the centralizer and flows back to the negative pole of the induced electromotive force.
Specifically, as shown in fig. 1, when installing, the casing 1 arranged in the well is connected with an oil pipe 2, a centralizer i 3, a nipple i 4, a packer 5, a nipple ii 6, a sensor integrated nipple 7, a centralizer ii 9 and the like from top to bottom in the casing 1 in sequence, wherein the centralizers are not only used for centralizing by the centralizer i 3 and the centralizer ii 9, but also used for electrically connecting the casing 1 with the oil pipe 2.
In one embodiment of the application, when underground data is uploaded, the upper short section I4 serves as an electromagnetic signal receiving short section, and the short section II 6 serves as an electromagnetic signal transmitting short section; when data on the well are downloaded, the nipple I4 is used as an electromagnetic signal transmitting nipple, and the nipple II 6 is used as an electromagnetic signal receiving nipple.
Specifically, when the downhole data is uploaded, as shown in fig. 2, the nipple ii 6 serving as the electromagnetic signal transmitting nipple includes an oil pipe 2, a metal protective outer casing ii 12, a battery pack ii 11 between the oil pipe 2 and the metal protective outer casing 12, a transmitting signal processing module ii 13, a receiving signal processing module ii 14 (used during reception), and a TM wave transmitting/receiving antenna ii 15. The TM wave transmitting/receiving antenna II 15 is composed of an annular soft magnetic material and a coil surrounding the soft magnetic material; the emission signal processing module II 13 comprises a sensor analog signal acquisition circuit (A/D), a coding module, a modulation module, a band-pass filter circuit module, a power amplification circuit module and an emission current monitoring module. The acquisition, coding and modulation of the analog signals are completed by a first microcontroller (a singlechip, an FPGA (field programmable gate array) or a DSP (digital signal processor), the coding adopts Gray code coding \ error control coding, and the modulation mode adopts BFSK/BPSK.
And a nipple II 6 of the electromagnetic signal transmitting nipple is sealed by a nipple I sealing cover 10 made of high-temperature, high-pressure and corrosion-resistant insulating materials (such as PEEK, PPS or PI) at the upper part. The nipple II 6 of the electromagnetic signal transmitting nipple, the sensor integrated nipple 7 and the oil pipe 2 are connected together through threaded joints, a power amplification circuit in the transmitting signal processing module II 13 is electrically connected with the TM wave transmitting/receiving antenna II 15, the transmitting current monitoring module monitors the transmitting power in real time, the sensor integrated nipple 7 and the nipple II 6 of the electromagnetic signal transmitting nipple transmit sensor signals through a cable 8, and sensors in the sensor integrated nipple 7 comprise sensors of pressure, flow, temperature and the like.
As shown in fig. 3, the nipple i 4 as an electromagnetic signal receiving nipple includes an oil pipe 2 and a metal protective casing i 19, and a received signal processing module i 17, a battery pack i 20, and a TM wave receiving/transmitting antenna i 16 between the oil pipe 2 and the metal protective casing i 19, wherein the received signal processing module i 17 is also used as a transmitted signal processing module during transmission, and the TM wave receiving/transmitting antenna i 16 is used as a TM wave receiving antenna. The TM wave receiving/transmitting antenna I16 consists of a magnetic core with high magnetic conductivity and a coil; the received signal processing module I17 comprises a signal filtering circuit, a voltage gain amplifying circuit, a signal demodulating circuit and a signal decoding circuit, wherein the signal demodulating and decoding are completed by a second microcontroller (a single chip microcomputer, an FPGA or a DSP and the like). The nipple I4 of the electromagnetic signal receiving nipple is packaged with a nipple II sealing cover 21 made of high-temperature-resistant, high-pressure-resistant and corrosion-resistant insulating materials below, the nipple I4 of the electromagnetic signal receiving nipple and the oil pipe 2 are connected together through a threaded joint, and the received signal processing module I17 is in wired connection with the TM wave receiving/transmitting antenna I16.
In order to realize the bidirectional transmission of signals, each short section simultaneously comprises a transmitting module and a receiving module, the transmitting antenna and the receiving antenna are common, but the number of turns of the coil of the transmitting antenna is different from that of the coil of the receiving antenna, and in order to meet the regulation and control of transmitting power, the antenna structure in the two short sections is improved, as shown in fig. 4, a plurality of taps are arranged on each magnetic core to provide selection of transmitting coils with different numbers of turns, and the transmitting coils are switched through a relay through program control. If a multi-turn coil is needed during signal receiving, a first tap 22 and a second tap 23 are connected; if the signal transmission needs a coil with less turns, the second tap 23 and the third tap 24 are connected.
When underground data is uploaded, when a TM wave transmitting/receiving antenna II 15 in a short section II 6 of an electromagnetic transmitting short section is used as a TM wave transmitting antenna to generate an alternating magnetic field in a magnetic core through alternating current, the alternating magnetic field generates induced electromotive force on an oil pipe 2 of the short section II 6 of the electromagnetic signal transmitting short section, as shown in figure 1, as the oil pipe 2, a centralizer I3, a sleeve 1 and a centralizer II 9 form an equivalent loop, current can flow from the oil pipe 2 to the centralizer I3 and then to the centralizer II 9 through the sleeve 1, and finally flows back to a negative electrode of the induced electromotive force. And capturing the current signal at the electromagnetic signal receiving short section, and finally realizing the transmission of the signal.
Referring to fig. 1-4 and 5, another embodiment is provided:
referring to fig. 5, the dotted lines in fig. 5 indicate wireless communication. A cased well ground signal bidirectional wireless electromagnetic transmission method is based on the cased well ground signal bidirectional wireless electromagnetic transmission device of the embodiment, and comprises the following steps:
step 1), when underground data is uploaded, the upper pup joint I4 is used as an electromagnetic signal receiving pup joint, the lower pup joint II 6 is used as an electromagnetic signal transmitting pup joint, when a TM wave transmitting antenna in the pup joint II 6 of the electromagnetic transmitting pup joint generates an alternating magnetic field in a magnetic core through alternating current, the alternating magnetic field generates induced electromotive force on an oil pipe 2 of the pup joint II 6 of the electromagnetic signal transmitting pup joint, and as a metal oil casing pipe penetrating through the magnetic core of the transmitting antenna and a loop electrode or a packer 5 form a conductor loop to generate induced current in the loop, a magnetic core on the pup joint I4 of the electromagnetic signal receiving pup joint in the loop can capture current signals to realize the uploading of the signals;
step 2) when the ground data is downloaded, the lower short section II 6 serves as an electromagnetic signal receiving short section, the upper short section I4 serves as an electromagnetic signal transmitting short section, a TM wave transmitting antenna in the short section I4 of the electromagnetic transmitting short section generates an alternating magnetic field in a magnetic core through alternating current, the alternating magnetic field generates induced electromotive force on an oil pipe 2 of the short section I4 of the electromagnetic signal transmitting short section, the current signal is captured by the short section II 6 of the electromagnetic signal receiving short section to finish signal downloading, and the signals between the short section I4 and the short section II 6 are transmitted in a two-way mode.
Wherein, the downhole data uploading embodiment:
(1) analog signals of the sensor in the sensor integrated short section 7 are connected with a transmission signal processing module II 13 in a short section II 6 of the electromagnetic signal transmission short section through a cable 8, the first microcontroller is responsible for converting the analog signals into digital signals through A/D, the digital signals are coded for reducing error codes generated in signal transmission, and the coded digital signals are modulated.
(2) And (3) the modulated signal obtained by the processing in the step (1) is subjected to band-pass filtering denoising and power amplification processing and then is connected to a TM wave transmitting antenna of a TM wave transmitting/receiving antenna II 15 for transmission.
(3) Alternating current in a TM wave transmitting antenna coil flowing through the TM wave transmitting/receiving antenna II 15 can be obtained through an ampere loop theorem, an alternating magnetic field can be generated in a magnetic core, the alternating magnetic field in the magnetic core can generate induced electromotive force on an oil pipe 2 through a Faraday electromagnetic induction law, the oil pipe 2 and a sleeve pipe 1 form an equivalent loop due to the existence of a centralizer I3 and a centralizer II 9, the alternating current in the loop can be obtained through an ohm theorem, and signals are transmitted through the current in the loop.
(4) When the loop current flows through the short section I4 of the electromagnetic signal receiving short section, a weak alternating magnetic field is generated around the TM wave receiving antenna of the TM wave receiving/transmitting antenna I16, and induced electromotive force (namely, a receiving signal) is generated at two ends of the coil of the TM wave receiving antenna of the TM wave receiving/transmitting antenna I16 by Faraday's law of electromagnetic induction.
(5) Carrying out denoising processing on the received signal through a band-pass filter circuit, and then carrying out gain amplification processing; and then the signal is sent to a second microcontroller for demodulation and decoding processing to obtain a digital baseband signal.
(6) D/A conversion is carried out on the digital baseband signal to obtain an analog signal of the sensor, so that real-time monitoring of the underground parameters is realized.
Therefore, the cased hole ground signal bidirectional wireless electromagnetic transmission device has the following advantages compared with the prior art:
(1) this application carries out electrical connection with oil pipe 2 and sleeve pipe 1 respectively in the pit with the pit, constitutes oil pipe 2 and sleeve pipe 1's equivalent circuit and comes transmission signal, because oil sheathed tube resistivity is less than the stratum resistivity far away, therefore the return circuit electric current of this application is bigger, and received signal's amplitude is bigger.
(2) The method avoids the signal transmission by utilizing the stratum, and the carrier frequency can reach more than 2KHz when the long-distance transmission is carried out.
(3) This application adopts the oil jacket pipe return circuit to carry out the transmission of signal, has better stability.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A two-way wireless electromagnetic transmission device for a cased well ground signal is characterized by comprising a casing (1) arranged underground, and an oil pipe (2), a centralizer I (3), a nipple I (4), a packer (5), a nipple II (6), a sensor integrated nipple (7) and a centralizer II (9) which are arranged in the casing (1) and sequentially connected from top to bottom; the centralizer I (3) and the centralizer II (9) are arranged up and down, and the centralizer I (3) and the centralizer II (9) are used for electrically connecting the casing (1) and the oil pipe (2); the short section I (4) is communicated with the short section II (6) through electromagnetic signals, and signals between the short section I (4) and the short section II (6) are transmitted in a two-way mode.
2. The cased well ground signal bidirectional wireless electromagnetic transmission device according to claim 1, wherein the pup joint I (4) and the pup joint II (6) comprise an oil pipe (2), a metal protection outer sleeve, a battery pack arranged between the oil pipe (2) and the metal protection outer sleeve, a transmission signal processing module and a reception signal processing module.
3. The cased hole ground signal bidirectional wireless electromagnetic transmission device according to claim 2, wherein the nipple II (6) further comprises a TM wave transmitting antenna, and the TM wave transmitting antenna is composed of an annular soft magnetic material and a coil surrounding the soft magnetic material.
4. The cased well-ground signal bidirectional wireless electromagnetic transmission device according to claim 2, wherein the nipple I (4) further comprises a TM wave receiving antenna, and the TM wave receiving antenna is composed of a magnetic core with high magnetic permeability and a coil.
5. The cased hole ground signal bidirectional wireless electromagnetic transmission device according to any one of claims 2-4, wherein the transmission signal processing module comprises a sensor analog signal acquisition circuit, a coding module, a modulation module, a band-pass filter circuit module, a power amplification circuit module and a transmission current monitoring module, the transmission signal processing module is used for generating a modulation signal, the modulation signal is obtained by performing sensor analog signal acquisition, coding and modulation by the first microcontroller, and the power amplification circuit in the transmission signal processing module is electrically connected with a TM wave transmitting antenna.
6. The cased hole ground signal bidirectional wireless electromagnetic transmission device according to claim 5, wherein the nipple I (4) and the nipple II (6) are provided with sealing covers made of insulating materials and used for packaging.
7. The cased well ground signal bidirectional wireless electromagnetic transmission device according to claim 6, wherein the nipple II (6), the sensor integrated nipple (7) and the tubing (2) are connected through a threaded joint, and the sensor integrated nipple (7) and the nipple II (6) transmit sensor signals through a cable (8).
8. The apparatus of claim 7, wherein the received signal processing module comprises a signal filtering circuit and a voltage gain amplifying circuit, wherein the signal received by the received signal processing module is demodulated and decoded by the second microcontroller.
9. A cased hole earth signal two-way wireless electromagnetic transmission device according to claim 2, wherein the tubing (2), centralizer i (3), casing (1) and centralizer ii (9) form an equivalent circuit of current flowing from tubing (2) to centralizer and back to the negative pole of the induced electromotive force.
10. A cased hole ground signal bidirectional wireless electromagnetic transmission method, based on the cased hole ground signal bidirectional wireless electromagnetic transmission device according to any one of claims 1-9, the cased hole ground signal bidirectional wireless electromagnetic transmission method comprising the steps of:
step 1), when underground data is uploaded, the upper short section I (4) is used as an electromagnetic signal receiving short section, the lower short section II (6) is used as an electromagnetic signal transmitting short section, when a TM wave transmitting antenna in the short section II (6) of the electromagnetic transmitting short section generates an alternating magnetic field in a magnetic core through alternating current, and as a metal oil casing pipe penetrating through a magnetic core of the transmitting antenna and a loop electrode or a packer form a conductor loop to generate induced current in the loop, the magnetic core on the short section I (4) of the electromagnetic signal receiving short section in the loop captures a current signal to realize the uploading of the signal;
step 2), when ground data is downloaded, lower part nipple II (6) is as electromagnetic signal receiving nipple, upper portion nipple I (4) is as electromagnetic signal transmitting nipple, TM wave transmitting antenna in nipple I (4) of electromagnetic transmitting nipple produces alternating magnetic field in the magnetic core through alternating current, alternating magnetic field produces induced electromotive force on oil pipe (2) of nipple I (4) of electromagnetic signal transmitting nipple, nipple II (6) at electromagnetic signal receiving nipple catches current signal and accomplishes signal downloading, the bidirectional transfer of signal between nipple I (4) and nipple II (6).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115680632A (en) * | 2022-12-30 | 2023-02-03 | 中国石油天然气股份有限公司 | Underground micro-current signal wireless uploading method and device |
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