High-power pulse type discharging device and method

Abstract

The invention relates to the technical field of oil-gas exploration, and discloses a high-power pulse type discharge device and method.The device comprises a flow regulation and control module, a power generation module, a signal processing module, an underground control module and an emission electrode assembly; wherein the power generation module is connected with the signal processing module through a signal line, the signal processing module is connected with the underground control module through a signal line, and the underground control module is connected with the emission electrode assembly through a signal line. The drilling fluid flow serves as a carrier to achieve generation of the excitation signal and complete issuing of the excitation signal, no cable participates in the whole process, all the modules are connected through short signal lines, the signal transmission distance between all the modules is shortened, electromagnetic interference caused by long-distance transmission of the signals in a well is avoided, and the service life of the signals is prolonged. And signal distortion is caused.

Description

Background Art

[0003] For the wellbore repair of difficult wells, a smooth wellbore channel is required, but the casing is prone to misalignment and opening due to corrosion and perforation, and it is impossible to ensure that it is always inside the original wellbore. Magnetic guidance technology (using the magnetic field signal of the casing) is needed to accurately locate it, and the high-power pulse discharge device is a very important component of the magnetic guidance tool. It is mainly used to excite the downhole electrode to form a measurement loop with the formation to achieve the purpose of high-precision magnetic detection of the target.

[0004] The existing high-power pulse discharge device mainly receives the excitation signal sent by the monitoring platform through a cable extending from the well surface to the well bottom to perform corresponding work. However, the disadvantage of the above scheme is that the excitation signal is transmitted through a long-distance cable and is easily affected by electromagnetic interference from the strong magnetic environment underground, causing signal distortion. Summary of the invention

[0005] In order to overcome the problem that the existing high-power pulse discharge device receives the excitation command of the monitoring platform through the cable and is interfered by the strong magnetic environment, resulting in signal distortion, the present invention provides a high-power pulse discharge device and method.

[0006] In the first aspect, in order to solve the above technical problems, the present invention provides a high-power pulse discharge device, comprising: a flow control module, a power generation module, a signal processing module, a downhole control module and an emission electrode assembly; wherein the power generation module is connected to the signal processing module through a signal line, the signal processing module is connected to the downhole control module through a signal line, and the downhole control module is connected to the emission electrode assembly through a signal line;

[0007] A flow control module, used for generating a flow control signal, and adjusting the flow rate of drilling fluid in the wellbore to a target flow rate according to the flow control signal;

[0008] The power generation module is disposed in the drilling fluid and is used to generate an electric signal under the power of the drilling fluid flowing at a target flow rate in the wellbore;

[0009] The signal processing module is electrically connected to the power generation module, and is used to process the power signal, generate a corresponding excitation signal and obtain the frequency parameters of the power signal;

[0010] The downhole control module is electrically connected to the signal processing module and is used to send an excitation signal to the transmitting electrode assembly when the frequency parameter of the power signal reaches a target value;

[0011] The transmitting electrode assembly is electrically connected to the downhole control module and is used to inject corresponding current into the formation according to the excitation signal.

[0012] In a second aspect, the present invention provides a high-power pulse discharge method, which is applied to the high-power pulse discharge device as described above, comprising:

[0013] Generate a flow control signal through the flow control module, and adjust the flow rate of drilling fluid in the wellbore to the target flow rate according to the flow control signal;

[0014] Under the dynamic effect of the drilling fluid flowing at a target flow rate in the wellbore, an electric signal is generated through the power generation module;

[0015] Perform signal processing on the power signal through the signal processing module to generate a corresponding excitation signal and obtain the frequency parameters of the power signal;

[0016] When the frequency parameter of the power signal reaches the target value, the excitation signal is sent to the transmitting electrode assembly through the downhole control module;

[0017] The corresponding current is injected into the formation according to the excitation signal through the transmitting electrode assembly.

[0018] The beneficial effects of the present invention are: the flow rate of drilling fluid in the wellbore is controlled by the flow control module, so that the power generation module generates an electric signal under the dynamic action of the drilling fluid flowing at the target flow rate, and then the signal processing module processes the electric signal to generate an excitation signal, and when the frequency parameter meets the preset requirements, the excitation signal is sent to the transmitting electrode assembly through the downhole control module. The present application uses the drilling fluid flow rate as a carrier to realize the generation of the excitation signal and complete the sending of the excitation signal. No cables are involved in the whole process, and each module is connected by a shorter signal line, which shortens the transmission distance of the signal between each module and avoids the problem of signal distortion caused by electromagnetic interference when the signal is transmitted over a long distance underground. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 A schematic diagram of the structure of a high-power pulse discharge device provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the structure of a flow control module provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a signal processing module provided by an embodiment of the present invention;

[0023] Figure 4 A flow chart of a high-power pulse discharge method provided by an embodiment of the present invention;

[0024] Figure 5A flow chart of a high-power pulse discharge method provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0025] The following examples are provided to further explain and supplement the present invention and do not constitute any limitation to the present invention.

[0026] The high-power pulse discharge device and method according to the embodiments of the present invention are described below with reference to the accompanying drawings.

[0027] like Figure 1 As shown, an embodiment of the present invention provides a high-power pulse discharge device, including: a flow control module, a power generation module, a signal processing module, a downhole control module and an emission electrode assembly; wherein the power generation module is connected to the signal processing module through a signal line, the signal processing module is connected to the downhole control module through a signal line, and the downhole control module is connected to the emission electrode assembly through a signal line;

[0028] A flow control module, used for generating a flow control signal, and adjusting the flow rate of drilling fluid in the wellbore to a target flow rate according to the flow control signal;

[0029] The power generation module is disposed in the drilling fluid and is used to generate an electric signal under the power of the drilling fluid flowing at a target flow rate in the wellbore;

[0030] The signal processing module is electrically connected to the power generation module, and is used to process the power signal, generate a corresponding excitation signal and obtain the frequency parameters of the power signal;

[0031] The downhole control module is electrically connected to the signal processing module and is used to send an excitation signal to the transmitting electrode assembly when the frequency parameter of the power signal reaches a target value;

[0032] The transmitting electrode assembly is electrically connected to the downhole control module and is used to inject corresponding current into the formation according to the excitation signal.

[0033] In this embodiment, the flow rate of drilling fluid in the wellbore is controlled by the flow control module, so that the power generation module generates an electric signal under the dynamic action of the drilling fluid flowing at the target flow rate, and then generates an excitation signal after processing the electric signal through the signal processing module, and sends the excitation signal to the transmitting electrode assembly through the downhole control module when the frequency parameter meets the preset requirements. This application uses the drilling fluid flow as a carrier to realize the generation of the excitation signal and complete the sending of the excitation signal. No cables are involved in the whole process, and each module is connected by a shorter signal line, which shortens the transmission distance of the signal between each module and avoids the problem of signal distortion caused by electromagnetic interference when the signal is transmitted over a long distance underground.

[0034] In this embodiment, the power range of the high-power pulse discharge device needs to be maintained above kilowatts to meet the purpose of downhole magnetic detection.

[0035] In this embodiment, the target value is set according to the actual situation. For example, when the output frequency of the power generation module reaches 50 Hz, the excitation signal is sent to the transmitting electrode assembly, and the target value can be set to 50 Hz. The target value is set manually in advance.

[0036] Alternatively, if Figure 2 As shown, the flow control module includes a signal acquisition unit, a ground control unit and a flow regulation unit;

[0037] A signal acquisition unit, used for acquiring a current loop signal formed between the transmitting electrode assembly and the formation after the transmitting electrode assembly last emitted current;

[0038] A ground control unit, used for generating a flow regulating signal according to the current return signal;

[0039] The flow regulating unit is used to regulate the flow of drilling fluid in the wellbore to a target flow according to a flow regulating signal.

[0040] In this embodiment, the signal acquisition unit and the flow regulation unit are respectively connected to the ground control unit, wherein:

[0041] In this embodiment, the ground control unit may be a ground decoding device and a computer. The ground decoding device and the computer may receive the current loop signal in real time and send the flow regulating signal to the flow regulating unit in real time;

[0042] In this embodiment, the signal acquisition unit is arranged in the wellbore, and when the transmitting electrode assembly emits current, the current loop signal can be collected in real time. The signal acquisition unit can adopt a current sensor.

[0043] In this embodiment, the flow rate of drilling fluid in the wellbore can be adjusted according to the current loop signal, and the flow rate of drilling fluid is used as an intermediary to provide power for the power generation module, thereby generating an excitation signal. No cables are involved in the entire process, and the drilling fluid flow rate is used as a medium to achieve the generation of the excitation signal.

[0044] Optionally, the flow regulating unit adopts an electronic water pump, which is arranged in the drilling fluid in the wellbore and is communicatively connected with the ground control unit; and is used to adjust the flow of the drilling fluid in the wellbore to a target flow.

[0045] In this embodiment, the electronic water pump is arranged in the wellbore, and the electronic water pump can receive control instructions from the ground decoding device and the computer in real time, so as to accurately control the flow rate of the drilling fluid in the wellbore, and further realize the adjustment of the power output by the power generation module.

[0046] Optionally, the ground control unit is specifically used to: determine the preset amplitude and preset frequency of the excitation signal required for the current emission current of the transmitting electrode assembly according to the current loop signal; determine the target flow rate of the drilling fluid corresponding to the preset amplitude and preset frequency according to a preset matching relationship; wherein the preset matching relationship characterizes the drilling fluid flow rates corresponding to different amplitudes and different frequencies.

[0047] In this embodiment, the ground control unit analyzes the current loop signal to determine the trajectory of the downhole drilling tool and achieve positioning. If it is found that the trajectory of the drilling tool is offset, it is necessary to change the transmission parameters (transmission power or transmission frequency) of the transmitting electrode assembly so that the transmitting electrode assembly transmits a stronger or lower current and repositions it. The strength of the current emitted by the transmitting electrode assembly is related to the frequency parameters of the power generation module. The larger the frequency parameters of the power generation module, the stronger the amplitude and frequency of the excitation signal that the power generation module can generate, so that the current emitted by the transmitting electrode assembly is smaller. On the contrary, the smaller the frequency parameters of the power generation module, the weaker the amplitude and frequency of the excitation signal that the power generation module can generate, so that the current emitted by the transmitting electrode assembly is smaller. In addition, the frequency parameters of the power generation module are related to the size of the drilling fluid flow rate. Therefore, a preset matching relationship is established to obtain the relationship between the preset amplitude and preset frequency of the excitation signal and the drilling fluid flow rate.

[0048] Alternatively, if Figure 3 As shown, the signal processing module includes a rectification and voltage regulation module, a high-voltage chopping module and a frequency detection module;

[0049] The rectifier and voltage regulator module is used to convert the three-phase AC power output by the power generation module into DC power;

[0050] A high-voltage chopping module, used for outputting direct current as an excitation signal of a preset amplitude and a preset frequency;

[0051] The frequency detection module is used to obtain the signal frequency of the power signal output by the power generation module.

[0052] In this embodiment, the rectifier and voltage regulator module and the frequency detection module are respectively connected to the power generation module, the rectifier and voltage regulator module are connected to the high-voltage chopper module, and the high-voltage chopper module and the frequency detection module are respectively connected to the downhole control module.

[0053] In this embodiment, the transmitting power and transmitting frequency of the transmitting electrode assembly are mainly related to the amplitude and frequency of the excitation signal, that is, the greater the amplitude and frequency of the excitation signal, the greater the transmitting power and transmitting frequency of the transmitting electrode assembly. On the contrary, the smaller the amplitude and frequency of the excitation signal, the smaller the transmitting power and transmitting frequency of the transmitting electrode assembly. Therefore, by adjusting the drilling fluid flow rate, the signal frequency output by the power generation module is changed, thereby achieving the adjustment of the transmitting power and transmitting frequency of the transmitting electrode assembly.

[0054] In this embodiment, through design and experiment, it is necessary to find out the relationship between the amplitude and frequency of the excitation signal and the drilling fluid flow rate. Once the relationship between the two is determined, the transmitting power, transmitting frequency and output frequency of the transmitting electrode can be determined accordingly.

[0055] For example, if the amplitude of the excitation signal is a1 and the frequency is a2, the drilling fluid flow rate needs to be set to a5. At this time, the drilling fluid flow rate in the wellbore is adjusted to a5. The power generation module will generate an electric signal due to the drilling fluid at a flow rate of a5. The three-phase AC power output by the power generation module is converted into an excitation signal with an amplitude of a1 and a frequency of a2. At this time, the excitation signal is sent to the transmitting electrode assembly, and the transmitting electrode assembly can transmit a current with a preset transmitting power and a preset transmitting frequency.

[0056] Optionally, the power generation module uses a turbine generator. In this embodiment, the turbine generator relies on the circulation of drilling fluid to convert kinetic energy into electrical energy, that is, the drilling fluid flushes the internal blades of the turbine generator to rotate. According to the principle of magnetoelectricity, it can provide the most primitive power supply for the high-power pulse discharge device. In addition, the voltage output by the turbine generator is proportional to the rotation speed of the internal blades, that is, proportional to the drilling fluid flow rate. The rotation speed of the blades can be expressed by frequency. The higher the frequency, the faster the rotation speed. Therefore, the greater the drilling fluid flow rate, the higher the frequency of the power generation module output, and the higher the output voltage.

[0057] like Figure 4 As shown, the present invention provides a high-power pulse discharge method, which is applied to a high-power pulse discharge device as in any of the above embodiments, comprising:

[0058] S1. Generate a flow control signal through a flow control module, and adjust the drilling fluid flow in the wellbore to a target flow according to the flow control signal.

[0059] S2. Under the dynamic effect of the drilling fluid flowing at a target flow rate in the wellbore, an electric signal is generated through the power generation module.

[0060] S3. Process the power signal through the signal processing module to generate a corresponding excitation signal and obtain the frequency parameters of the power signal.

[0061] S4. When the frequency parameter of the power signal reaches the target value, the excitation signal is sent to the transmitting electrode assembly through the downhole control module.

[0062] S5. Inject corresponding current into the formation according to the excitation signal through the transmitting electrode assembly.

[0063] Optionally, the flow control module includes a signal acquisition unit, a ground control unit and a flow regulation unit;

[0064] The flow control module generates a flow control signal, and adjusts the flow rate of the drilling fluid in the wellbore to the target flow rate according to the flow control signal, including:

[0065] The signal acquisition unit is used to collect a current loop signal formed between the transmitting electrode assembly and the formation after the transmitting electrode assembly last emitted current;

[0066] Generate a flow regulation signal according to the current return signal through a ground control unit;

[0067] The flow rate of drilling fluid in the wellbore is adjusted to the target flow rate by the flow regulating unit according to the flow regulating signal.

[0068] Optionally, generating a flow regulating signal according to the current return signal by a ground control unit includes:

[0069] Determine the preset amplitude and preset frequency of the excitation signal required for the current emission of the transmitting electrode assembly according to the current loop signal;

[0070] The target flow rate of the drilling fluid corresponding to the preset amplitude and the preset frequency is determined according to the preset matching relationship; wherein the preset matching relationship characterizes the drilling fluid flow rates corresponding to different amplitudes and different frequencies.

[0071] Optionally, the signal processing module includes a rectification and voltage stabilization module, a high-voltage chopping module and a frequency detection module;

[0072] The signal processing module processes the power signal, generates a corresponding excitation signal and obtains the frequency parameters of the power signal, including:

[0073] The three-phase AC power output by the power generation module is converted into DC power through the rectifier and voltage regulator module;

[0074] The direct current is output as an excitation signal of a preset amplitude and a preset frequency through a high-voltage chopping module;

[0075] The signal frequency of the power signal output by the power generation module is obtained through the frequency detection module.

[0076] Optionally, another embodiment is used to illustrate the working process of the high-power pulse discharge method. Figure 5 As shown:

[0077] The surface interface device and the computer send flow adjustment instructions to the electronic water pump so that the flow of the drilling fluid is adjusted to the target drilling fluid flow.

[0078] Secondly, the signal processing module processes the power signal, generates a corresponding excitation signal and obtains the frequency parameters of the power signal.

[0079] Secondly, when the frequency parameter reaches the target value, the downhole control module sends the excitation signal to the transmitting electrode assembly, and the transmitting electrode assembly excites the transmitting electrode according to the preset program.

[0080] Secondly, the signal acquisition module collects relevant data (current loop signal) and transmits it to the ground decoding device and computer;

[0081] Finally, the procedure and personnel determine whether it is necessary to adjust the electrode discharge parameters (transmitting power and transmitting frequency of the transmitting electrode assembly). If adjustment is required, different instructions are sent to the electronic water pump to achieve the effect of changing the relevant discharge parameters. If no adjustment is required, the electrode is excited according to the last preset procedure.

[0082] Those skilled in the art know that the present invention can be implemented as a system, method or computer program product. Therefore, the present disclosure can be specifically implemented in the following forms, namely: it can be complete hardware, it can be complete software (including firmware, resident software, microcode, etc.), or it can be a combination of hardware and software, generally referred to as "circuit", "module" or "system" herein. In addition, in some embodiments, the present invention can also be implemented in the form of a computer program product in one or more computer-readable media, and the computer-readable medium contains computer-readable program code. Computer-readable storage media can be, for example, but not limited to - electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or devices, or any combination of the above.

[0083] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0084] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. High-power pulse discharge device, characterized in that: include: Flow control module, power generation module, signal processing module, downhole control module and transmitting electrode assembly; The flow control module is used to generate a flow control signal and adjust the flow rate of drilling fluid in the wellbore to a target flow rate according to the flow control signal; The power generation module is disposed in the drilling fluid and is used to generate an electric signal under the power of the drilling fluid flowing at the target flow rate in the wellbore; The signal processing module is electrically connected to the power generation module, and is used to perform signal processing on the power signal, generate a corresponding excitation signal and obtain the frequency parameter of the power signal; The downhole control module is electrically connected to the signal processing module, and is used to send the excitation signal to the transmitting electrode assembly when the frequency parameter of the power signal reaches a target value; The transmitting electrode assembly is electrically connected to the downhole control module and is used to inject corresponding current into the formation according to the excitation signal.

2. The device according to claim 1, characterized in that The flow control module includes a signal acquisition unit, a ground control unit and a flow regulation unit; The signal acquisition unit is used to collect a current loop signal formed between the transmitting electrode assembly and the formation after the transmitting electrode assembly last emitted current; The ground control unit is used to generate a flow regulation signal according to the current return signal; The flow regulating unit is used to regulate the flow of drilling fluid in the wellbore to a target flow according to the flow regulating signal.

3. The device according to claim 2, characterized in that The flow regulating unit adopts an electronic water pump, which is arranged in the drilling fluid of the wellbore and is communicatively connected with the ground control unit; and is used to adjust the flow of the drilling fluid in the wellbore to the target flow.

4. The device according to claim 2, characterized in that The ground control unit is specifically used for: Determine the preset amplitude and preset frequency of the excitation signal required for the current emission of the transmitting electrode assembly according to the current loop signal; The target flow rate of the drilling fluid corresponding to the preset amplitude and the preset frequency is determined according to the preset matching relationship; wherein the preset matching relationship characterizes the drilling fluid flow rates corresponding to different amplitudes and different frequencies.

5. The device according to any one of claims 1 to 4, characterized in that: The signal processing module includes a rectification and voltage stabilization module, a high-voltage chopping module and a frequency detection module; The rectifying and voltage stabilizing module is used to convert the three-phase alternating current output by the power generation module into direct current; The high-voltage chopping module is used to output the direct current as an excitation signal of a preset amplitude and a preset frequency; The frequency detection module is used to obtain the signal frequency of the power signal output by the power generation module.

6. The device according to claim 1, characterized in that The power generation module adopts a turbine generator.

7. A high-power pulse discharge method, characterized in that: A high-power pulse discharge device as claimed in any one of claims 1 to 6, comprising: Generate a flow regulation signal through a flow control module, and regulate the flow of drilling fluid in the wellbore to a target flow according to the flow regulation signal; Under the power of the drilling fluid flowing at the target flow rate in the wellbore, an electric signal is generated through the power generation module; Performing signal processing on the power signal through a signal processing module to generate a corresponding excitation signal and obtain a frequency parameter of the power signal; When the frequency parameter of the power signal reaches a target value, the excitation signal is sent to the transmitting electrode assembly through a downhole control module; The corresponding current is injected into the formation through the transmitting electrode assembly according to the excitation signal.

8. The method according to claim 7, characterized in that The flow control module includes a signal acquisition unit, a ground control unit and a flow regulation unit; Then, a flow control module generates a flow control signal, and the flow rate of the drilling fluid in the wellbore is adjusted to a target flow rate according to the flow control signal, including: The signal collecting unit collects a current loop signal formed between the transmitting electrode assembly and the formation after the transmitting electrode assembly transmits current last time; Generate a flow rate regulating signal according to the current return signal by a ground control unit; The flow rate of the drilling fluid in the wellbore is adjusted to the target flow rate by the flow regulating unit according to the flow regulating signal.

9. The method according to claim 8, characterized in that The generating of the flow regulating signal according to the current return signal by the ground control unit includes: Determine the preset amplitude and preset frequency of the excitation signal required for the transmitting electrode assembly to transmit the current at the current time according to the current loop signal; The target flow rate of the drilling fluid corresponding to the preset amplitude and the preset frequency is determined according to the preset matching relationship; wherein the preset matching relationship characterizes the drilling fluid flow rates corresponding to different amplitudes and different frequencies.

10. The method according to claim 9, characterized in that The signal processing module includes a rectification and voltage stabilization module, a high-voltage chopping module and a frequency detection module; Then, the power signal is processed by a signal processing module to generate a corresponding excitation signal and obtain a frequency parameter of the power signal, including: The three-phase alternating current output by the power generation module is converted into direct current through a rectifying and voltage stabilizing module; Outputting the direct current into an excitation signal of a preset amplitude and a preset frequency through a high-voltage chopping module; The signal frequency of the electric power signal output by the power generation module is obtained through the frequency detection module.

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