CN114552796A - Underground communication and power supply method, system and device - Google Patents

Abstract

The invention relates to a method, a system and a device for underground communication and power supply. The ground coupling coil group is connected with a load end positioned underground through a throwing and fishing type connecting structure or a pipeline type connecting structure to form a communication and power supply system. The connection male head configured by the throwing and fishing type connection structure or the pipeline type connection structure is connected with the connection female head arranged at the underground load end to form a load side coupling coil group. The load side coupling coil group can respectively obtain energy and information through decoupling of induced current and transmit the energy and the information to the load end, and therefore communication and/or power supply of the aboveground control end and the underground load end are completed.

Description

Underground communication and power supply method, system and device

Technical Field

The invention relates to the technical field of geological construction, in particular to a method, a system and a device for underground communication and power supply.

Background

With the development of various underground cable equipment such as rodless lifting, separate zone water injection and the like, underground power supply equipment is also developed correspondingly.

Patent publication No. CN109899059A discloses a drill string communication system, components and method. The uphole transceiver may couple the signal to the drill string at a power that may be greater than, and in some embodiments always greater than, the selectable power for the downhole signal. The uphole transceiver may resume communication from the drilling rig to the inground tool using the maximum uphole transmission power. The program may establish a new set of transmission parameters for the drill string signal to establish communication between the drilling rig and the inground tool. The system may include a ground walking positioner that receives electromagnetic positioning signals that activate/deactivate state control. The uphole transceiver and the downhole transceiver may automatically modify at least one parameter of the downhole signal. The uphole receiver may apply a compensation response to the transmit signal to compensate for the drill string channel transfer function.

The invention patent with publication number CN111441760A discloses a throwing and fishing type underground wireless transmission system, wireless charging equipment and a method, and the system comprises: the throwing and fishing type underground measuring device is used for measuring the temperature, pressure, flow and water content in the deep well oil pipe and then converting the temperature, pressure, flow and water content into electric signals; the ground monitoring device is positioned on the ground surface and used for receiving and processing the electric signals; the automatic setting device is positioned at the periphery of the throwing and fishing type underground measuring device, is used for fixing the throwing and fishing type underground measuring device at a set position, and can automatically return to a setting state after receiving a taking-out signal; and the embedded antenna is positioned on the periphery of the sleeve and transmits the electric signal to obtain the parameters of the underground fluid when a signal transmission loop is formed.

The cable is bound on the outer wall of an oil pipe mostly when the cable-carrying equipment in the prior art goes into the well, the well repairing operation is complex, people need to bind on the well mouth in the process of going into the well, and the cable is extremely easy to extrude and damage in the process. In order to solve the problems, a technical scheme of lowering a cable from an oil pipe and realizing the running and fishing butt joint of the cable in the oil pipe is developed later. The method solves the problem that the cable is easy to extrude and damage, and simultaneously simplifies the working procedure of entering the well; however, the mode needs to fill the isolating liquid in the underground butt joint, the liquid is very expensive, the liquid is very easy to cause serious pollution to the environment during production and use, in addition, the throwing and fishing device is very complex in structure and high in processing cost, an inner drift diameter is not reserved, the work of underground equipment can be influenced during use, and if a logging instrument needs to be put into the underground butt joint, the equipment needs to be lifted out, so that the construction efficiency is influenced. In addition, the transmission lines of the communication lines in the prior art are mutually independent, and in underground engineering, signal transmission and power transmission can be completed only by laying a plurality of lines, so that the line laying work is complicated.

The invention provides a method, a system and a device for underground communication and power supply, which aim to better realize simpler, safer and more reliable communication between a ground power supply and underground equipment. The underground communication and power supply system and the device provided by the invention have simple structure and do not need isolation liquid, and the underground communication and power supply method provided by the invention can be used for working under pressure without influencing conventional work such as underground water injection and the like.

Furthermore, on the one hand, due to the differences in understanding to the person skilled in the art; on the other hand, since the applicant has studied a great deal of literature and patents when making the present invention, but the disclosure is not limited thereto and the details and contents thereof are not listed in detail, it is by no means the present invention has these prior art features, but the present invention has all the features of the prior art, and the applicant reserves the right to increase the related prior art in the background.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a downhole communication and power supply method. In the method, a control end positioned on the well is electrically connected with a ground coupling coil group. And the ground coupling coil group forms a communication and power supply system in a mode of connecting the fishing type connecting structure or the pipeline type connecting structure with a load end positioned underground, so that communication and/or power supply between an aboveground control end and the underground load end can be realized. According to the invention, the communication and power supply channel between the ground power supply and the underground equipment is built through the throwing-fishing type connecting structure or the pipeline type connecting structure, so that the communication and power supply between the ground power supply and the underground equipment can be realized under the condition of not influencing the normal water injection work. The control end is electrically connected with the ground coupling coil group, then couples the energy excitation and the information excitation together through the ground coupling coil group, and then transmits the coupled energy excitation and information excitation to the load end through the throwing and fishing type connecting structure or the pipeline type connecting structure. And the throwing and fishing type connecting structure or the pipeline type connecting structure can decouple the energy excitation and the information excitation which are coupled together when being connected with the load end positioned in the underground and then transmit the energy excitation and the information excitation to the load end. In case the overshot connection or pipe connection is connected to the load end located downhole, there is an air gap at the connection. The invention realizes double transmission of energy and information based on a mutual inductance model theory of an electromagnetic induction principle. The invention can realize the communication and power supply between the ground and the underground under the condition of not influencing the normal water injection work when being used on underground water injection equipment. The invention avoids the environmental pollution caused by construction without using isolation liquid, and avoids the problem that the cable is easy to extrude and damage by binding the cable outside the pipeline. The invention converts different electric signals into magnetic signals based on the electromagnetic induction principle and then transmits the magnetic signals after coupling, thereby reducing the number of transmission lines and completing communication and power supply simultaneously only by one conventional conductive wire.

According to a preferred embodiment, the current transmitted by the control terminal located at the well comprises a current in a first state for transmitting energy and a current in a second state for transmitting a signal. The second state is different from the first state. Preferably, the control terminal transmits the energy and the information signal by simultaneously transmitting the currents of the first state and the second state to the ground coupling coil assembly. Preferably, the control end can also only select to transmit the current in the first state or the second state to the ground coupling coil group, and at the moment, the control end only transmits one of energy and information to the underground load end.

According to a preferred embodiment, an energy transmitting port and/or a signal port electrically connected with the control end are/is arranged on the coupling side of the ground coupling coil group and the control end. The control end is connected with the ground coupling coil group to convert the electric signal into a magnetic signal. Preferably, after the control terminal is connected with the ground coupling coil set, the current in the first state is input from the energy transmission port, and the current in the second state is input from the signal port. The ground coupling coil group and the coils connected with the control end are divided into three groups, namely an energy transmission winding, a receiving winding and a sending winding, wherein the energy transmission winding adopts a low-frequency sinusoidal excitation signal, the sending winding adopts a high-frequency excitation, and the receiving winding receives the sending signal of the load end. The invention isolates each signal by arranging different windings, thereby avoiding interference and reducing the difficulty of signal processing. And only one group of coils is arranged at one end of the ground coupling coil group, which is not connected with the control end. The ground coupling coil group couples signals transmitted by the three groups of coils together for transmission based on electromagnetic induction, and energy and/or information can be transmitted by only arranging one transmission channel.

According to a preferred embodiment, the load end located downhole is provided with a connection female. The connecting female head is provided with an energy receiving port and/or a signal port which are electrically connected with the load end. The connecting female head is connected with the connecting male head configured by the throwing and fishing type connecting structure or the pipeline type connecting structure to form a load side coupling coil group so as to convert a magnetic signal into an electric signal which can be received by a load end. The load side coupling coil group is also provided with three groups of coils, wherein the energy transfer winding is responsible for receiving magnetic flux and converting the magnetic flux into electric energy, the receiving winding receives a primary side sending signal, the sending winding distinguishes the frequency of the primary side sending winding to carry out excitation, and all signals are isolated.

According to a preferred embodiment, the ground coupling coil assembly has a complete transformer core. The control end located on the well couples low-frequency energy excitation and high-frequency information excitation together through the ground coupling coil assembly, and the coupled energy excitation and information excitation are transmitted to the load end through the throwing and fishing type connecting structure or the pipeline type connecting structure.

According to a preferred embodiment, the connecting male head and the connecting female head are each provided with a coil. The male connecting head is provided with a primary coil. The female connection head is provided with a secondary coil. Under the condition that the connecting male head is connected with the connecting female head, the primary coil and the secondary coil are in butt joint to form a load side coupling coil group, and the load side coupling coil group can respectively obtain energy and information through decoupling of induced current.

According to a preferred embodiment, the overshot connection comprises at least a cable connecting the surface-coupled coil assembly and a male head connecting the load end located downhole. Preferably, the center of the throwing and fishing type connecting structure is provided with a channel for allowing water, oil and other liquids to pass through. Preferably, the underground water injection device can realize the communication and power supply between the ground and the underground under the condition that the normal water injection work is not influenced by using the underground water injection device, and avoids the environmental pollution caused by construction without using an isolation liquid.

According to a preferred embodiment, the pipe-type connecting structure is provided with a connecting male head and a connecting female head on two sides of the pipe wall respectively. Under the condition that more than two pipeline type connecting structures exist, the pipeline type connecting structures are connected through the connecting male head and the connecting female head. The energy and/or signals transmitted from the control end to the load end are transmitted in the form of electric signals in the pipeline-type connecting structures, and magnetic signals are transmitted between the pipeline-type connecting structures. Pipeline formula connection structure neither need the pipeline bind the cable outward, also need not to drop into the cable in the pipeline, has both solved the problem that the cable can't pass through the packer outside the pipeline, has solved the problem that can't throw and drag for at horizontal well or highly deviated well cable again, has avoided outer bandaid cable to extrude impaired problem easily simultaneously. The pipeline type connecting structure does not need to be filled with isolation liquid when being connected, so that the pollution to the environment is avoided.

The invention also provides a device for underground communication and power supply. The control end positioned on the well is electrically connected with the ground coupling coil group, and the control end is connected with the load end positioned under the well through a throwing and fishing type connecting structure or a pipeline type connecting structure. And the connecting male head configured by the throwing and fishing type connecting structure or the pipeline type connecting structure is connected with the connecting female head arranged at the underground load end to form a load side coupling coil group. The load side coupling coil group can obtain energy and information used for being transmitted to the load end through decoupling of induced current, and therefore communication and/or power supply of the uphole control end and the downhole load end are completed.

The invention also provides a downhole communication and power supply system. And the control end positioned on the well couples the low-frequency energy excitation and the high-frequency information excitation together by electrically connecting the ground coupling coil group. The ground coupling coil group is connected with a load end positioned underground through a throwing and fishing type connecting structure or a pipeline type connecting structure. And the connecting male head configured by the throwing and fishing type connecting structure or the pipeline type connecting structure is connected with the connecting female head arranged at the underground load end to form a load side coupling coil group. The load side coupling coil group can respectively obtain energy and information through decoupling of induced current and transmit the energy and the information to the load end, so that communication and/or power supply of the aboveground control end and the underground load end are completed.

Drawings

FIG. 1 is a simplified schematic diagram of a preferred downhole communication and power method provided by the present invention;

FIG. 2 is a simplified schematic diagram of a preferred ground coupled coil assembly provided by the present invention;

FIG. 3 is a simplified schematic diagram of a preferred load side coupled coil assembly provided by the present invention;

FIG. 4 is a simplified schematic illustration of a preferred overshot connection provided by the present invention;

FIG. 5 is a simplified schematic illustration of a preferred ducted connection provided by the present invention;

FIG. 6 is a simplified schematic diagram of a preferred transmission coil assembly provided by the present invention;

FIG. 7 is a schematic view of a preferred male connection end and a preferred female connection end of the drop-in connection;

fig. 8 is a schematic view of a preferred coupling male and female of the ducted coupling structure.

List of reference numerals

100: downhole communication and power supply methods; 101: a primary coil; 102: a secondary coil; 110: a control end; 120: a ground coupling coil group; 121: an energy transmission port; 122: a signal transmission port; 123: an energy receiving port; 131: connecting a male head; 132: connecting the female head; 133: a tube wall; 134: a transmission wire; 140: a load end; 150: a load side coupling coil group; 151: an air gap; 200: a throwing and fishing type connecting structure; 300: a pipe type connecting structure; 401: a cable.

Detailed Description

The following detailed description is made with reference to fig. 1 to 8.

After the control end on the ground is connected with the ground coupling coil group, the ground coupling coil group induces magnetic flux corresponding to the energy transfer current and the signal current in an electromagnetic induction mode based on the energy transfer current and the signal current sent by the control end, namely the energy transfer current and the signal current sent by the control end are connected with the ground coupling coil group to form energy excitation and information excitation. The ground coupling coil group couples the energy excitation and the information excitation and then transmits the energy excitation and the information excitation to the load end through the connecting structure. The load end and the connecting structure form a load side coupling coil group at the connecting position. The load side coupling coil group can decouple the coupled energy excitation and information excitation and induce corresponding energy transfer current and signal current to be transferred to equipment connected with a load end. The communication and power supply channel constructed by the underground communication and power supply method can carry out bidirectional transmission, wherein the underground load end and the ground control end can realize bidirectional transmission of signals because the underground load end and the ground control end can both generate signal current. According to different application scenes, the invention designs two forms of connection structures: a throwing and fishing type connecting structure and a pipeline type connecting structure. The centers of the two connecting structures are both provided with liquid channels, so that the underground power supply can be communicated with the underground equipment without influencing underground construction, and can simultaneously communicate and supply power by utilizing one channel. For example, when the invention is used on underground water injection equipment, the communication and power supply between the ground and the underground can be realized under the condition of not influencing the normal water injection work. According to the invention, when underground connection is carried out, isolation liquid is not needed, so that environmental pollution caused by construction is avoided, cables do not need to be bound outside the pipeline, and the problem that the cables are easily extruded and damaged by an outer cable is avoided.

According to different application scenes, the invention selectively uses one of the two connection structures of the fishing type connection structure or the pipeline type connection structure in practical use. Correspondingly, the underground communication and power supply method can be subdivided into two underground communication and power supply methods according to different adopted connection structures, wherein one underground communication and power supply method is based on a throwing and fishing type connection structure, and the other underground communication and power supply method is based on a pipeline type connection structure.

Example 1

With the development of various underground cable devices such as rodless lifting, separated layer water injection and the like, the trend is to use armored cables as ground power supplies and underground devices. The cable is bound to the oil pipe outer wall mostly when current tape cable equipment goes into the pit to because the difference of the power consumption and the signal power consumption of engineering equipment in the pit is great, consequently lay power cable and signal cable respectively mostly when laying the cable, there is the workover operation complicacy, need someone to bind at the well head in laying process and tie up the operation, the cable very easily extrudes impaired scheduling problem at this in-process moreover.

The present embodiment provides a downhole communication and power supply method 100. Referring to fig. 1, the downhole communication and power supply method 100 preferably first connects a control terminal 110 at the surface to a surface set of coupling coils 120, and then the set of coupling coils 120 is connected to a downhole load terminal 140 via a downhole connection. The energy transmission current and the signal current of the control terminal 110 generate energy excitation and information excitation in the ground coupling coil assembly 120, the ground coupling coil assembly 120 couples the energy excitation and the information excitation, and the coupled energy excitation and information excitation are transmitted to the load terminal 140 through a downhole connection structure. The downhole connection structure passes to form a load side coupling coil assembly 150 at the connection with the load end 140. The load side coupling coil assembly 150 decouples the coupled energy excitation and information excitation, separates the energy excitation and information excitation, and generates corresponding induced current to be transmitted to the downhole device at the load end 140. The method comprises the steps of coupling excitation generated by currents in different states sent by the control end 110, transmitting the coupled excitation to the load end 140 through a channel, and performing decoupling operation at the connection position of the load end 140 and a downhole connection structure to separate energy transmission current and signal current. Preferably, the connection structure adopted by the present embodiment is a salvaging connection structure 200. Preferably, this embodiment may be referred to as a downhole communication and power supply method 100 that is based on an overshot connection configuration. The method converts different electric signals into magnetic signals based on the electromagnetic induction principle, and then transmits the magnetic signals after coupling, thereby reducing the number of transmission lines and completing communication and power supply simultaneously only by one conventional conductive wire. The conducting wire of the method is arranged in the pipeline, so that the problem that the cable is easily damaged due to extrusion in the process of underground operation is solved, and the throwing and fishing type connecting structure 200 of the embodiment does not need isolation liquid, so that the pollution to the environment is avoided.

Preferably, the control terminal 110 located uphole in the downhole communication and power supply method 100 based on the overshot connection structure 200 is electrically connected to the surface coupled coil assembly 120. The surface coupling coil assembly 120 is connected to the load end 140 located downhole through the overshot connection structure 200 to form a communication and power supply system, so that communication and/or power supply between the uphole control end 110 and the downhole load end 140 can be performed. According to the invention, a communication and power supply channel between the ground power supply and the underground equipment is built through the throwing-fishing type connecting structure 200, so that the communication and power supply between the ground power supply and the underground equipment can be realized under the condition of not influencing the normal water injection work. After the control terminal 110 is electrically connected to the ground coupling coil assembly 120, the control terminal 110 couples the energy excitation and the information excitation together through the ground coupling coil assembly 120, and transmits the coupled energy excitation and information excitation to the load terminal 140 through the salvage type connection structure 200. In the case of an overshot connection 200 where it is connected to a load end 140 located downhole, there is an air gap 151 at the connection.

Preferably, the current transmitted by the control terminal 110 located at the well includes a current in a first state for transmitting energy and a current in a second state for transmitting a signal. The second state is different from the first state. Preferably, the control terminal 110 transmits energy and information signals by simultaneously transmitting the first state and the second state of current to the ground coupling coil assembly 120. Preferably, the control end 110 can also only select to transmit the current in the first state or the second state to the surface coupling coil set 120, and at this time, the control end 110 only transmits one of the energy and the information to the load end 140 downhole.

Referring to fig. 2, preferably, the coupling side of the ground coupling coil assembly 120 and the control terminal 110 is provided with an energy transmitting port 121 and/or a signal port 122 electrically connected to the control terminal 110. The control terminal 110 converts the electrical signal into a magnetic signal by connecting with the ground coupling coil assembly 120. Preferably, after the control terminal 110 is connected to the ground coupling coil assembly 120, a current in a first state is input from the energy transmission port 121, and a current in a second state is input from the signal port 122.

Preferably, the ground coupling coil assembly 120 possesses a complete transformer core. The ground coupling coil group 120 and the coils connected to the control terminal 110 are divided into three groups, which are respectively an energy transmission winding, a receiving winding and a sending winding. The energy-transmitting winding adopts a low-frequency sinusoidal excitation signal, the transmitting winding adopts high-frequency excitation, and the receiving winding receives the transmission signal of the load end 140. Preferably, the energy transmission port 121 is connected to the energy transmission winding and forms high-frequency excitation on the energy transmission winding with a frequency of several hundreds to several kilohertz. The signal ports 122 are preferably connected to the receive and transmit windings, respectively. Preferably, the signal port 122 is capable of forming a low frequency excitation on the transmit winding having a frequency of ten to one hundred hertz. Preferably, the signal port 122 is capable of receiving by converting a magnetic signal carrying information transmitted by the load terminal 140 into an electrical signal via the receive winding.

Preferably, only one set of coils is disposed at the end of the ground coupling coil set 120 not connected to the control terminal 110. The ground coupling coil assembly 120 couples signals transmitted by the three sets of coils together for transmission based on electromagnetic induction, and only one transmission channel is needed to transmit energy and/or information. Preferably, in the embodiment, different windings are arranged to isolate signals, so that interference is avoided, and the difficulty in signal processing is reduced.

Preferably, the control terminal 110 located on the well couples the low-frequency energy excitation and the high-frequency information excitation together by electrically connecting the ground coupling coil assembly 120, and then transmits the coupled energy excitation and information excitation to the load terminal 140 through the fishing-type connecting structure 200.

Referring to fig. 3, a load end 140 located downhole is preferably provided with a connection female 132. The female connection head 132 is provided with an energy receiving port 123 and/or a signal port 122 electrically connected to the load end 140. The female connection head 132 is connected to the male connection head 131 disposed in the fishing connection structure 200 to form the load-side coupling coil group 150, thereby converting a magnetic signal into an electrical signal that can be received by the load terminal 140.

Preferably, the connection male head 131 and the connection female head 132 are each provided with a coil. The connection male 131 is provided with a primary coil 101. The connection female 132 is provided with the secondary coil 102. Under the condition that the male connection head 131 configured in the bailing connection structure 200 is connected with the female connection head 132 arranged at the underground load end 140, the primary coil 101 and the secondary coil 102 are butted to form a load side coupling coil group 150, and the load side coupling coil group 150 can respectively obtain energy and information by decoupling induced current. Preferably, the primary coil 101 and the secondary coil 102 each include a core and a wire wound around the surface of the core.

Preferably, three sets of coils are also arranged on the side of the load-side coupling coil set 150 connected to the load end 140, including an energy transmission winding for receiving magnetic flux and converting the magnetic flux into electric energy, a receiving winding for receiving a signal transmitted by the control end 110, and a transmitting winding for generating low-frequency excitation. The transmitting winding of the load side coupling coil assembly 150, which is connected to the load end 140, generates a low frequency excitation that is different from the frequency of the control end 110 exciting the transmitting winding of the ground coupling coil assembly 120. Isolation is also made between the signals. Preferably, the energy receiving port 123 is connected with the energy transmitting winding on the load side of the load side coupling coil set 150. Preferably, the signal ports 122 of the load side coupling coil assembly 150 are connected with the receive winding and the transmit winding.

Referring to fig. 4, the overshot connection structure 200 preferably includes at least a cable 401 connected to the surface-coupled coil assembly 120 and a connection male 131 connected to the downhole load end 140. Preferably, the ground coupling coil assembly 120 couples the low-frequency energy excitation and the high-frequency information excitation together and then is connected to the connection male connector 131 of the fishing connection structure 200 through the cable 401. The male connector 131 of the overshot connection structure 200 and the female connector 132 provided at the load end 140 form a load-side coupling coil group 150. The load side coupling coil assembly 150 decouples the coupled low frequency energy excitation and high frequency information excitation to generate corresponding induced current to be transmitted to the underground equipment, so that communication and power supply between the ground facility and the underground facility are completed.

Preferably, in the case that the male connection terminal 131 of the drop-in connection structure 200 and the female connection terminal 132 provided at the load end 140 form the load-side coupling coil group 150, that is, when the primary coil 101 and the secondary coil 102 are connected to form a coil group (transformer), an air gap 151 exists at the connection.

Referring to fig. 7, the salvage type connection structure 200 connects the male connection head 131 and the female connection head 132 in a socket manner. Preferably, the connection male 131 and the connection female 132 are both designed tubular. Preferably, the outer diameter of the connection male 131 is less than or equal to the inner diameter of the connection female 132. Preferably, a liquid passage is provided inside the connection male 131. Preferably, the primary coil 101 of the connection male 131 is disposed on the outer wall of the connection male 131. Preferably, the secondary coil 102 is disposed on an inner wall of the connection female head 132. With the male connection terminal 131 and the female connection terminal 132 connected, the primary coil 101 can be aligned with the secondary coil 102 to form the load-side coupling coil group 150. When the primary winding 101 and the secondary winding 102 are connected to form a winding set (transformer), an air gap 151 exists at the joint, namely, a gap at the joint of the male connection 131 and the female connection 132.

Preferably, the windings of the primary coil 101 and the windings of the secondary coil 102 are separate closed matrices, and preferably, the coil windings can be sealed by three sealing means. One is a pure glue injection mode, the coil winding is wrapped in the glue injection mode, and the glue layer is processed to the required size after glue injection is completed. The coils of the male connector 131 and the female connector 132 are connected flush, and the magnetic conductors (iron cores) of the primary coil 101 and the secondary coil 102 are aligned. Preferably, when the primary coil 101 and the secondary coil 102 are connected, an air gap 151 is formed between the two, and the rubber material wrapping the winding fills the air gap 151 to play a role in closing, so that impurities can be prevented from entering the coil winding under the condition that magnetic flux transmission is not influenced.

Referring to fig. 7, the second way is to use permalloy, which is a high permeability material, on both sides of the primary coil 101 and the secondary coil 102, and weld the coil surfaces together with magnetic heads on both ends through stainless steel to isolate the magnetic core winding from the well fluid.

In the third mode, the stainless steel part in the second mode is replaced by ceramic material, so that the effects of magnetic isolation and eddy current prevention can be better achieved.

Preferably, the salvaging connection structure 200 is centrally provided with a passage allowing the passage of water, oil, etc. liquid. Preferably, the invention can realize the communication and power supply between the ground and the underground under the condition of not influencing the normal water injection work, and avoids the environmental pollution caused by construction without using isolation liquid.

Preferably, the winding of the primary coil 101 portion has 200 turns. Preferably, the coil wire diameter is 0.71 mm. Preferably, the width of the air gap 151 formed between the male connector 131 and the female connector 132 is 0.1 mm.

Example 2

This embodiment is a further improvement of embodiment 1, and repeated contents are not described again. Preferably, the fishing-in connection structure 200 of embodiment 1 cannot be used to connect the surface coupling coil assembly 120 and the load end 140 located downhole in a horizontal well or a highly deviated well. Preferably, this embodiment improves the downhole connection structure of embodiment 1, and provides a downhole communication and power supply method based on a pipe connection structure.

The method uses a tubular connection 300 to connect the surface-coupled coil assembly 120 and the downhole load end 140. Referring to fig. 5, preferably, the pipe type connection structure 300 may include a connection male head 131, a connection female head 132, a pipe wall 133 and a transmission wire 134. Preferably, the pipe type connecting structure 300 is provided with a connecting male connector 131 and a connecting female connector 132 on both sides of the pipe wall 133. In the case that there are more than two pipe connection structures 300, the pipe connection structures 300 are connected to each other by the male connection head 131 and the female connection head 132. The energy and/or signals transmitted from the control terminal 110 to the load terminal 140 are transmitted in the form of electrical signals in the pipe connection structure 300, and magnetic signals are transmitted between the pipe connection structures 300. Pipeline formula connection structure 300 neither ties up the cable outward with the pipeline, also need not to drop into the cable in the pipeline, has both solved the problem that the cable can't pass through the packer outside the pipeline, has solved the problem that can't throw and drag for at horizontal well or highly deviated well cable again, has avoided outer nation's cable to extrude impaired problem easily simultaneously. The pipeline connecting structure 300 does not need filling isolation liquid when being connected, so that the pollution to the environment is avoided.

Referring to fig. 6, it is preferable that the connection male connector 131 and the connection female connector 132 provided on the pipe connection structure 300 are connected to each other to constitute a transmission coil assembly as shown in fig. 6. Preferably, after the male connection end 131 and the female connection end 132 arranged on the pipe connection structure 300 are connected, the transmission coil set formed by the primary coil 101 of the male connection end 131 and the secondary coil 102 of the female connection end 132 does not have a coupling or decoupling function. Preferably, the primary winding 101 connected to the male connector 131 and the secondary winding 102 connected to the female connector 132 form an equal voltage transformer, which plays a main role in communication and power supply between the surface and the downhole. The primary coil 101 connected to the male connector 131 converts the electrical signal into a magnetic signal and transmits the magnetic signal to the secondary coil 102 connected to the female connector 132, and the secondary coil 102 connected to the female connector 132 induces a corresponding electrical signal in response to the "reception of the magnetic signal" and transmits the electrical signal to the rear end through the transmission wire 134 provided on the pipe wall 133. Preferably, the transmission wire 134 may be disposed inside the tube wall 133. Preferably, the transmission wire 134 may also be welded to the inner wall of the pipe wall 133 by a seamless steel pipe. .

Preferably, when the pipe connection structure 300 is used for surface and downhole communication and power supply, the connection male connector 131 is connected to the coil on the side of the surface coupling coil set 120 not connected to the control end 110. Preferably, the connection male connector 131 connected to the ground coupling coil assembly 120 may be connected to the connection female connector 132 provided on the pipe connection structure 300 to form a transmission coil assembly for transmitting communication and power supply information.

Referring to fig. 8, preferably, the connection male connector 131 and the connection female connector 132 of the pipe connection structure 300 can form one coil assembly (transformer). In other words, the pipe connection structure 300 is to cut off a transformer from the middle, respectively mount the transformer on two ends of the oil pipe, and when the male connection end 131 and the female connection end 132 are connected to make the two end faces tightly contact together, the whole transformer is assembled. Under the condition of power connection, the winding connected with the male head 131 generates magnetic flux and transmits the magnetic flux to the winding connected with the female head 132 through the iron core, so that the wire connected with the female head 132 generates current, the generated current is transmitted to the winding connected with the male head 131 of the next oil pipe through the transmission wire 134, the winding converts the electricity into magnetism and transmits the magnetism downwards, and the current of the control end 110 on the ground is transmitted to the electric equipment of the downhole load end 140 through the pipeline type connecting structure 300 in a circulating mode. The structure is not used for binding cables outside the oil pipe, and cables do not need to be thrown into the oil pipe, so that the problem that the cables cannot penetrate through the packer outside the oil pipe is solved, and the problem that the cables cannot be thrown and fished in a horizontal well or a highly-deviated well is solved.

Preferably, the tubular connection structure 300 is provided with a coupling male 131 and a coupling female 132 at both ends of the tubing pipe by tubing coupling, respectively. Referring to fig. 8, the connection male connector 131 and the connection female connector 132 are each provided in a tubular shape, and a winding case made of stainless steel is welded to sidewalls of the connection male connector 131 and the connection female connector 132, thereby isolating a space of a winding portion from a well fluid. Preferably, the primary coil 101 and the secondary coil 102 enclose the coil windings by means of glue injection. The male connector 131 and the female connector 132 are mated together to form a complete transformer, thereby realizing the transmission of current between the pipe-type connecting structures 300. The male connector 131 and the female connector 132 arranged at two ends of the same oil pipe are connected through a transmission lead 134, and the transmission lead 134 and well fluid are required to be isolated. Preferably, the transmission wire 134 employs a seamless tube of stainless steel tube as its outer shell. Preferably, the transmission wire 134 may also be disposed inside the tube wall 133. When the transmission lead 134 is connected, the positions of the upper oil pipe and the lower oil pipe are relatively fixed. The smaller the gap between the two windings, the more efficient it conducts. The butt joint surface of the two windings is also divided into three structures similar to the contact surface of the non-contact throwing and fishing male head and female head, wherein one structure is a pure glue injection form and is isolated by glue; in addition, the surface of the male connector 131 and the surface of the female connector 132 are provided with coatings, the magnetic head part is made of high-permeability materials, the middle part is made of stainless steel or ceramic materials, and the end socket and the inner shell and the outer shell are connected together through welding to seal the winding space.

The method converts different electric signals into magnetic signals based on the electromagnetic induction principle, and then transmits the magnetic signals after coupling, thereby reducing the number of transmission lines and completing communication and power supply simultaneously only by one conventional conductive wire. The conductive wire of the method is arranged in the pipeline, so that the problem that the cable is easily damaged due to extrusion in the process of underground operation is avoided, and the pipeline type connecting structure 300 of the embodiment does not need to use isolation liquid, so that the pollution to the environment is avoided. Preferably, the pipeline type connecting structure of the method can be directly used as a downhole construction pipeline, and when downhole water injection construction is carried out, the method can finish the installation of communication and power supply lines when downhole construction equipment is installed (namely, in the process of installing oil pipes in the traditional downhole construction), so that the construction efficiency is improved.

Example 3

This embodiment is a further improvement on embodiments 1 and 2, and repeated details are not repeated.

The embodiment also provides a downhole communication and power supply device. The control end 110 located on the well is electrically connected to the ground coupling coil assembly 120, and then is connected to the load end 140 located under the well through the fishing connection structure 200 or the pipe connection structure 300. The connection male connector 131 disposed in the fish-in connection structure 200 or the pipe connection structure 300 is connected to the connection female connector 132 disposed at the load end 140 located downhole to form the load-side coupling coil assembly 150. The load side coupling coil set 150 can obtain energy and information respectively through decoupling the induced current and transmit the energy and information to the load end 140, so as to complete communication and/or power supply between the uphole control end 110 and the downhole load end 140.

The device converts different electric signals into magnetic signals based on the electromagnetic induction principle, and then transmits the magnetic signals after coupling, so that the number of transmission lines is reduced, and communication and power supply can be completed simultaneously only by one conventional conductive wire. The conducting wire of the method is arranged in the pipeline, so that the problem that the cable is easily damaged due to extrusion in the process of underground operation is solved, and the throwing and fishing type connecting structure 200 of the embodiment does not need isolation liquid, so that the pollution to the environment is avoided. Preferably, the pipeline type connecting structure of the method can be directly used as a downhole construction pipeline, and when downhole water injection construction is carried out, the method can finish the installation of communication and power supply lines when downhole construction equipment is installed (namely, in the process of installing oil pipes in the traditional downhole construction), so that the construction efficiency is improved.

Example 4

This embodiment is a further improvement on embodiments 1, 2 and 3, and repeated details are not repeated.

The present embodiments provide a downhole communication and power supply system. The control terminal 110 located on the well couples the low frequency energy excitation and the high frequency information excitation together by electrically connecting the surface coupling coil assembly 120. The surface coupling coil assembly 120 is connected to the load end 140 located downhole through a fishing connection 200 or a pipe connection 300. The male connection end 131 disposed in the fishing connection structure 200 or the pipe connection structure 300 is connected to the female connection end 132 disposed at the downhole load end 140 to form the load-side coupling coil group 150. The load side coupling coil assembly 150 can obtain energy and information respectively through the decoupling of the induced current and transmit the energy and information to the load end 140, so as to complete the communication and/or power supply between the uphole control end 110 and the downhole load end 140.

The system converts different electric signals into magnetic signals based on the electromagnetic induction principle, and then transmits the magnetic signals after coupling, so that the number of transmission lines is reduced, and communication and power supply can be completed simultaneously only by one conventional conductive wire. The conducting wire of the method is arranged in the pipeline, so that the problem that the cable is easily damaged due to extrusion in the process of underground operation is solved, and the throwing and fishing type connecting structure 200 of the embodiment does not need to use isolation liquid, so that the pollution to the environment is avoided. Preferably, the pipeline type connecting structure of the method can be directly used as a downhole construction pipeline, and when downhole water injection construction is carried out, the method can finish the installation of communication and power supply lines when downhole construction equipment is installed (namely, in the process of installing oil pipes in the traditional downhole construction), so that the construction efficiency is improved.

It should be noted that the above-mentioned embodiments are exemplary, and that those skilled in the art, having benefit of the present disclosure, may devise various arrangements that are within the scope of the present disclosure and that fall within the scope of the invention. It should be understood by those skilled in the art that the present specification and figures are illustrative only and are not limiting upon the claims. The scope of the invention is defined by the claims and their equivalents. Throughout this document, the features referred to as "preferably" are only an optional feature and should not be understood as necessarily requiring that such applicant reserves the right to disclaim or delete the associated preferred feature at any time. The present description contains several inventive concepts, such as "preferably", "according to a preferred embodiment" or "optionally", each indicating that the respective paragraph discloses a separate concept, the applicant reserves the right to submit divisional applications according to each inventive concept.

Claims (10)

1. A downhole communication and power supply method is characterized in that a control end (110) located on a well is electrically connected with a ground coupling coil group (120), the ground coupling coil group (120) is connected with a load end (140) located under the well through a throwing and fishing type connecting structure (200) or a pipeline type connecting structure (300) to form a communication and power supply system so as to carry out communication and/or power supply of the control end (110) located on the well and the load end (140) located under the well, wherein the throwing and fishing type connecting structure (200) or the pipeline type connecting structure (300) is connected with the load end (140) located under the well to form a magnetic flux transmission channel.

2. A downhole communication and power supply method according to claim 1, wherein the control terminal (110) located uphole transmits a current comprising a first state of current for transmitting energy and a second state of current for transmitting signals; the second state is different from the first state.

3. A downhole communication and power supply method according to claim 1 or 2, wherein the coupling side of the surface coupling coil set (120) and the control end (110) is provided with an energy transmitting port (121) and/or a signal transmission port (122) for electrically connecting the control end (110), and the control end (110) converts the electric signal into the magnetic signal by connecting with the surface coupling coil set (120).

4. A downhole communication and power supply method according to any of claims 1 to 3, wherein a load end (140) located downhole is provided with a female connection head (132), the female connection head (132) is provided with an energy receiving port (123) and/or a signal transmitting port (122) electrically connected with the load end (140), and the female connection head (132) is connected with a male connection head (131) configured on the retrievable connection structure (200) or the pipeline connection structure (300) to form a load side coupling coil group (150) so as to convert a magnetic signal into an electrical signal capable of being received by the load end (140).

5. The downhole communication and power supply method according to any one of claims 1 to 4, wherein the surface coupling coil assembly (120) has a transformer core, the control end (110) located on the well couples the low-frequency energy excitation and the high-frequency information excitation together by electrically connecting the surface coupling coil assembly (120), and then transmits the coupled energy excitation and information excitation to the load end (140) through the throwing and fishing type connecting structure (200) or the pipeline type connecting structure (300).

6. The downhole communication and power supply method according to any one of claims 1 to 5, wherein the male connection head (131) and the female connection head (132) are provided with coils, the male connection head (131) is provided with a primary coil (101), the female connection head (132) is provided with a secondary coil (102), and when the male connection head (131) is connected with the female connection head (132), the primary coil (101) and the secondary coil (102) are butted to form a load side coupling coil set (150), and the load side coupling coil set (150) can obtain energy and information respectively by decoupling induced current.

7. A downhole communication and power supply method according to any of claims 1-6, wherein the overshot connection structure (200) comprises at least a cable (401) connecting the surface-coupled coil assembly (120) and a connection male (131) connecting a load end (140) located downhole.

8. A downhole communication and power supply method according to any of claims 1-6, wherein the tubular connection structure (300) is provided with a male connection head (131) and a female connection head (132) on both sides of a tubular wall (133), respectively; in the case that more than two pipeline-type connecting structures (300) exist, the pipeline-type connecting structures (300) are connected through the connecting male head (131) and the connecting female head (132); the energy and/or signals transmitted by the control terminal (110) to the load terminal (140) are transmitted in the form of electric signals in the pipe-type connecting structures (300) and magnetic signals are transmitted between the pipe-type connecting structures (300).

9. The underground communication and power supply device is characterized in that a control end (110) located on the well is electrically connected with a ground coupling coil group (120) and is connected with a load end (140) located under the well through a throwing and fishing type connecting structure (200) or a pipeline type connecting structure (300); the connection male head (131) configured on the throwing and fishing type connection structure (200) or the pipeline type connection structure (300) is connected with the connection female head (132) arranged on the underground load end (140) to form a load side coupling coil group (150); the load side coupling coil set (150) can obtain energy and information for transferring to the load end (140) through decoupling of induced current, so that communication and/or power supply of the uphole control end (110) and the downhole load end (140) are completed.

10. A downhole communication and power supply system, characterized in that a control terminal (110) located on the well couples together the low frequency energy excitation and the high frequency information excitation by electrically connecting a ground coupling coil set (120), the ground coupling coil group (120) is connected with a load end (140) positioned underground through a throwing and fishing type connecting structure (200) or a pipeline type connecting structure (300), the connection male head (131) configured on the throwing and fishing type connection structure (200) or the pipeline type connection structure (300) is connected with the connection female head (132) arranged on the underground load end (140) to form a load side coupling coil group (150), the load side coupling coil group (150) can respectively obtain energy and information through decoupling of induced current and transmit the energy and the information to the load end (140), thereby completing communication and/or power supply of the uphole control end (110) and the downhole load end (140).

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