CN217080441U - Two-way wireless electromagnetic transmission device of cased well ground signal - Google Patents
Two-way wireless electromagnetic transmission device of cased well ground signal Download PDFInfo
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- CN217080441U CN217080441U CN202220926613.8U CN202220926613U CN217080441U CN 217080441 U CN217080441 U CN 217080441U CN 202220926613 U CN202220926613 U CN 202220926613U CN 217080441 U CN217080441 U CN 217080441U
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Abstract
The utility model discloses a cased well ground signal bidirectional wireless electromagnetic transmission device, which comprises a casing arranged underground, and an oil pipe, a centralizer I, a nipple I, a packer, a nipple II, a sensor integration nipple and a centralizer II which are arranged in the casing and are 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. The current intensity in the current loop of the cased well ground signal bidirectional wireless electromagnetic transmission device is far higher than that of the current loop in the traditional technology. Under the condition of transmitting the same distance, the received signal amplitude is larger, the carrier frequency is higher, and the transmission is not unstable due to the fact that the transmission is independent of the stratum.
Description
Technical Field
The utility model relates to an oil gas field development technical field, in particular to two-way wireless electromagnetic transmission device of cased hole ground signal.
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 depends on the earth to form a closed loop to complete signal transmission, and 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 (0.1-10Hz) carrier is usually used for data transmission, which results in slow and inefficient data transmission rate.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a two-way wireless electromagnetic transmission device of cased well ground signal, this application is for can be in the metal casing under the complicated stratum environment of anisotropy, metal oil pipe and packer and the oil casing annulus ground water of high salinity the device that the signal was observed and controled in the pit under the narrow and small space of observing and controling under the oil casing annulus ground water from passing to ground and ground control command is wireless down to the instrument equipment of observing and controlling in the pit through wireless electromagnetism mode in the pit.
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; through electromagnetic signal intercommunication between nipple joint I and the nipple joint II, the two-way transmission of the signal between nipple joint I and the nipple joint II, nipple joint I all includes oil pipe, metal protection overcoat and sets up with nipple joint II group battery, transmission signal processing module and received signal processing module between oil pipe and the metal protection overcoat.
As a further scheme of the present application, the short section ii further includes a TM (Transverse magnetic wave) 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.
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 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 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.
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. Under the condition of transmitting the same distance, the received signal amplitude is larger, the carrier frequency is higher, and the transmission is not unstable due to the fact that the transmission 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 section structure of a nipple II in the cased well 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 the bi-directional wireless electromagnetic transmission device for cased hole signals.
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.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
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 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 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 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 a negative electrode of the induced electromotive force.
Specifically, as shown in fig. 1, when installing, the casing 1 arranged in the well is sequentially connected with an oil pipe 2, a centralizer i 3, a pup joint i 4, a packer 5, a pup joint ii 6, a sensor integrated pup joint 7, a centralizer ii 9 and the like from top to bottom in the casing, wherein the centralizers are not only used for centralizing but also used for electrically connecting the casing 1 with the oil pipe 2 by the centralizers i 3 and ii 9.
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 lower short section II 6 serves as an electromagnetic signal transmitting short section; when data in the well are downloaded, the upper short section I4 is used as an electromagnetic signal transmitting short section, and the lower short section II 6 is used as an electromagnetic signal receiving short section.
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 sensor analog signals are completed by a first microcontroller (a single chip microcomputer, an FPGA (field programmable gate array) or a DSP (digital signal processor) and 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, a pup joint i 4 serving as an electromagnetic signal receiving pup joint comprises an oil pipe 2, a metal protection outer sleeve i 19, a received signal processing module i 17, a battery pack i 20 and a TM wave receiving/transmitting antenna i 16, 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. Because the metal oil casing pipe passing through the magnetic core of the transmitting antenna and the loop electrode or the packer form a conductor loop and induced current is generated in the loop, the magnetic core on the electromagnetic signal receiving short section I4 in the loop can capture the current signal to realize the uploading of the signal, and finally the transmission of the signal is realized, similarly, when ground data is downloaded, the short section II 6 is used as the electromagnetic signal receiving short section, the short section I is used as the electromagnetic signal transmitting short section, when the TM wave transmitting antenna in the short section I4 generates an alternating magnetic field in the magnetic core through alternating current, the current signal is captured at the short section II 6 of the electromagnetic signal receiving short section to finish the downloading of the signal; and bidirectional transmission of signals between the short section I4 and the short section II 6 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 and sleeve pipe respectively in the pit with the well, constitutes oil pipe and sheathed tube equivalent circuit and comes transmission signal, because oil sheathed tube resistivity is less than the stratum resistivity far away, therefore this application's return circuit electric current is bigger, and received signal's range 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.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
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 this 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 (9)
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 hole 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, and a battery pack, a transmitting signal processing module and a receiving signal processing module which are arranged between the oil pipe (2) and the metal protection outer sleeve.
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 hole ground signal bidirectional wireless electromagnetic transmission device according to claim 2, wherein the transmitting 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 transmitting current monitoring module, the transmitting 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 transmitting signal processing module is electrically connected with a TM wave transmitting antenna.
5. The cased hole ground signal bidirectional wireless electromagnetic transmission device according to claim 1, wherein the nipple i (4) and the nipple ii (6) are provided with sealing caps made of insulating materials and used for packaging.
6. The cased well ground signal bidirectional wireless electromagnetic transmission device according to any one of claims 2-5, 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).
7. The cased hole ground signal bidirectional wireless electromagnetic transmission device according to claim 6, 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.
8. The apparatus of claim 2, 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.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220926613.8U CN217080441U (en) | 2022-04-21 | 2022-04-21 | Two-way wireless electromagnetic transmission device of cased well ground signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220926613.8U CN217080441U (en) | 2022-04-21 | 2022-04-21 | Two-way wireless electromagnetic transmission device of cased well ground signal |
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| CN217080441U true CN217080441U (en) | 2022-07-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717241A (en) * | 2023-04-14 | 2023-09-08 | 中国科学院地质与地球物理研究所 | Ground receiving front-end compensation system for electromagnetic transmission of intelligent well guiding and drilling |
-
2022
- 2022-04-21 CN CN202220926613.8U patent/CN217080441U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116717241A (en) * | 2023-04-14 | 2023-09-08 | 中国科学院地质与地球物理研究所 | Ground receiving front-end compensation system for electromagnetic transmission of intelligent well guiding and drilling |
| CN116717241B (en) * | 2023-04-14 | 2024-02-09 | 中国科学院地质与地球物理研究所 | Ground receiving front-end compensation system for electromagnetic transmission of intelligent well guiding and drilling |
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