High power pulsed discharge device and method

Abstract

The application relates to the technical field of oil and gas exploration, and discloses a high-power pulse discharge device and method, which comprises a flow regulation module, a power generation module, a signal processing module, a downhole control module and a transmitting 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 downhole control module through a signal line, and the downhole control module is connected with the transmitting electrode assembly through a signal line. The application takes the drilling fluid flow as a carrier to realize the generation of excitation signals and complete the delivery of the excitation signals, does not use a cable in the whole process, and connects various modules through relatively short signal lines, shortens the signal transmission distance between various modules, avoids the problem that the signal is interfered with by electromagnetism during long-distance transmission in the downhole, and causes signal distortion.

Description

Technical Field

[0001] This invention relates to the field of oil and gas exploration technology, and in particular to a high-power pulsed discharge device and method. Background Technology

[0002] For wellbore repair in challenging wells, a clear wellbore passage is essential. However, casing corrosion and perforation can easily lead to misalignment and window opening, making it impossible to ensure the casing remains within the original wellbore. Magnetic guidance technology (utilizing the casing's magnetic field signal) is required for precise positioning. High-power pulsed discharge devices are a crucial component of magnetic guidance tools, primarily used to excite downhole electrodes, creating a measurement loop with the formation to achieve high-precision magnetic detection of the target.

[0003] Existing high-power pulsed discharge devices mainly receive excitation signals from the monitoring platform via a cable extending from the surface to the underground to perform corresponding operations. However, the drawback of the above scheme is that the excitation signal is easily affected by electromagnetic interference from the strong magnetic environment underground when transmitted through a long-distance cable, causing signal distortion. Summary of the Invention

[0004] To overcome the problem that existing high-power pulsed discharge devices receive excitation commands from the monitoring platform via cable, which are subject to interference from strong magnetic environments, resulting in signal distortion, this invention provides a high-power pulsed discharge device and method.

[0005] In a first aspect, in order to solve the above-mentioned technical problems, the present invention provides a high-power pulsed discharge device, comprising: a flow control module, a power generation module, a signal processing module, a downhole control module, and a transmitting electrode assembly; wherein, the power generation module and the signal processing module are connected by a signal line, the signal processing module and the downhole control module are connected by a signal line, and the downhole control module and the transmitting electrode assembly are connected by a signal line.

[0006] The flow control module is used to generate a flow control signal and adjust the drilling fluid flow rate in the wellbore to the target flow rate according to the flow control signal;

[0007] The power generation module is installed in the drilling fluid and is used to generate electrical signals under the power of the drilling fluid flowing in the wellbore at a target flow rate;

[0008] The signal processing module is electrically connected to the power generation module and is used to process the power signal, generate the corresponding excitation signal, and obtain the frequency parameters of the power signal.

[0009] 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 the target value.

[0010] 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.

[0011] Secondly, the present invention provides a high-power pulsed discharge method, applied to the high-power pulsed discharge device as described above, comprising:

[0012] The flow control module generates a flow regulation signal, and the flow rate of drilling fluid in the wellbore is adjusted to the target flow rate according to the flow regulation signal.

[0013] Under the dynamic action of drilling fluid flowing at the target flow rate in the wellbore, an electrical signal is generated through the power generation module;

[0014] The power signal is processed by the signal processing module to generate the corresponding excitation signal and obtain the frequency parameters of the power signal.

[0015] When the frequency parameters of the power signal reach the target value, the excitation signal is sent to the transmitting electrode assembly through the downhole control module;

[0016] The corresponding current is injected into the formation according to the excitation signal by the transmitting electrode assembly.

[0017] The beneficial effects of this invention are as follows: The flow rate of drilling fluid in the wellbore is controlled by the flow control module, thereby enabling the power generation module to generate an electrical signal under the dynamic action of the drilling fluid flowing at the target flow rate. The electrical signal is then processed by the signal processing module to generate an excitation signal. When the frequency parameters meet the preset requirements, the excitation signal is sent to the transmitting electrode assembly via the downhole control module. This application uses the drilling fluid flow rate as a carrier to generate and send the excitation signal, eliminating the need for cables throughout the process. Furthermore, the modules are connected by short signal lines, shortening the signal transmission distance between modules and avoiding the problem of signal distortion caused by electromagnetic interference during long-distance downhole transmission. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic diagram of the structure of the high-power pulsed discharge device provided in an embodiment of the present invention;

[0020] Figure 2 This is a schematic diagram of the flow control module provided in an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the signal processing module provided in an embodiment of the present invention;

[0022] Figure 4A flowchart of a high-power pulsed discharge method provided in an embodiment of the present invention;

[0023] Figure 5 A flowchart of a high-power pulsed discharge method provided in another embodiment of the present invention. Detailed Implementation

[0024] The following embodiments are further explanations and supplements to the present invention and do not constitute any limitation on the present invention.

[0025] The high-power pulsed discharge device and method of the present invention are described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, this embodiment of the invention provides a high-power pulsed discharge device, including: a flow control module, a power generation module, a signal processing module, a downhole control module, and a transmitting electrode assembly; wherein, the power generation module and the signal processing module are connected by a signal line, the signal processing module and the downhole control module are connected by a signal line, and the downhole control module and the transmitting electrode assembly are connected by a signal line.

[0027] The flow control module is used to generate a flow control signal and adjust the drilling fluid flow rate in the wellbore to the target flow rate according to the flow control signal;

[0028] The power generation module is installed in the drilling fluid and is used to generate electrical signals under the power of the drilling fluid flowing in the wellbore at a target flow rate;

[0029] The signal processing module is electrically connected to the power generation module and is used to process the power signal, generate the corresponding excitation signal, and obtain the frequency parameters of the power signal.

[0030] 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 the target value.

[0031] 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.

[0032] In this embodiment, the flow rate of drilling fluid in the wellbore is controlled by a flow control module. This allows the power generation module to generate an electrical signal under the power of the drilling fluid flowing at the target flow rate. The signal processing module then processes the electrical signal to generate an excitation signal. When the frequency parameters meet preset requirements, the excitation signal is sent to the transmitting electrode assembly via the downhole control module. This application uses the drilling fluid flow rate as a carrier to generate and send the excitation signal, eliminating the need for cables throughout the process. Furthermore, the modules are connected by short signal lines, shortening the signal transmission distance between modules and avoiding electromagnetic interference and signal distortion issues that can occur during long-distance downhole signal transmission.

[0033] In this embodiment, the power range of the high-power pulsed discharge device needs to be maintained above kilowatts to meet the purpose of downhole magnetic detection.

[0034] In this embodiment, the target value is set according to the actual situation. For example, if it is required that the excitation signal be sent to the transmitting electrode assembly when the output frequency of the power generation module reaches 50Hz, the target value can be set to 50Hz. The target value is set manually in advance.

[0035] Optionally, such as Figure 2 As shown, the flow control module includes a signal acquisition unit, a ground control unit, and a flow regulation unit;

[0036] The signal acquisition unit is used to acquire the current loop signal formed between the transmitting electrode assembly and the formation after the last transmitting current.

[0037] The ground control unit is used to generate flow regulation signals based on the current return signal;

[0038] The flow regulation unit is used to adjust the flow rate of drilling fluid in the wellbore to the target flow rate according to the flow regulation signal.

[0039] In this embodiment, the signal acquisition unit and the flow regulation unit are respectively connected to the ground control unit, wherein:

[0040] In this embodiment, the ground control unit can be a ground decoding device and a computer. The ground decoding device and computer can receive current loop signals in real time and send flow regulation signals to the flow regulation unit in real time;

[0041] In this embodiment, the signal acquisition unit is installed in the wellbore. Once the transmitting electrode assembly emits current, the current loop signal can be acquired in real time. The signal acquisition unit can be a current sensor.

[0042] In this embodiment, the flow rate of drilling fluid in the wellbore can be adjusted based on the current loop signal. The flow rate of drilling fluid is used as a medium to provide power to the power generation module, thereby generating an excitation signal. The entire process does not require the participation of cables, and the generation of the excitation signal is achieved by using the flow rate of drilling fluid as a medium.

[0043] Optionally, the flow regulation unit uses an electronic water pump, which is installed in the drilling fluid in the wellbore and communicates with the surface control unit; it is used to adjust the flow rate of the drilling fluid in the wellbore to the target flow rate.

[0044] In this embodiment, the electronic water pump is installed in the wellbore, and the electronic water pump can receive control commands from the ground decoding device and the computer in real time, thereby accurately controlling the flow rate of drilling fluid in the wellbore, and thus adjusting the power output of the power generation module.

[0045] Optionally, the ground control unit is specifically used to: determine the preset amplitude and preset frequency of the excitation signal required by the transmitting electrode assembly for the current transmitting current based on the current loop signal; and determine the target flow rate of the drilling fluid corresponding to the preset amplitude and preset frequency based on the preset matching relationship; wherein the preset matching relationship characterizes the drilling fluid flow rate corresponding to different amplitudes and different frequencies.

[0046] 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 the trajectory of the drilling tool is found to deviate, the transmission parameters (transmission power or transmission frequency) of the transmitting electrode assembly need to be changed to make the transmitting electrode assembly emit a stronger or weaker current for repositioning. The strength of the transmission current of 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 excitation signal that the power generation module can generate, resulting in a smaller transmission current of the transmitting electrode assembly. Conversely, the smaller the frequency parameters of the power generation module, the weaker the amplitude and frequency excitation signal that the power generation module can generate, resulting in a smaller transmission current of the transmitting electrode assembly. In addition, the frequency parameters of the power generation module are also related to 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.

[0047] Optionally, such as Figure 3 As shown, the signal processing module includes a rectification and regulation module, a high-voltage chopper module, and a frequency detection module;

[0048] The rectifier and voltage regulator module is used to convert the three-phase AC power output from the power generation module into DC power.

[0049] The high-voltage chopper module is used to output DC power as an excitation signal with a preset amplitude and frequency.

[0050] The frequency detection module is used to obtain the signal frequency of the power signal output by the power generation module.

[0051] 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 is 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.

[0052] In this embodiment, the transmission power and transmission 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 transmission power and transmission frequency of the transmitting electrode assembly. Conversely, the smaller the amplitude and frequency of the excitation signal, the smaller the transmission power and transmission 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 transmission power and transmission frequency of the transmitting electrode assembly.

[0053] In this embodiment, through design and experimentation, it is necessary to find 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 emission power of the transmitting electrode, the emission frequency, and the output frequency of the power signal can be determined accordingly.

[0054] For example, if the amplitude of the excitation signal is a1 and the frequency is a2, then 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 electrical signal because the drilling fluid is flowing at a 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 then transmit a current with a preset transmission power and a preset transmission frequency.

[0055] Optionally, the power generation module uses a turbine generator. In this embodiment, the turbine generator converts kinetic energy into electrical energy through drilling fluid circulation. That is, the drilling fluid washes over the internal blades of the turbine generator to make them rotate. According to the principle of magnetoelectricity, this can provide the most basic power supply for a high-power pulsed discharge device. In addition, the voltage output by the turbine generator is directly proportional to the rotational speed of the internal blades, which is also directly proportional to the flow rate of the drilling fluid. The rotational speed of the blades can be represented by frequency. The higher the frequency, the faster the rotational speed. Therefore, the greater the flow rate of the drilling fluid, the higher the frequency of the power generation module output, and the higher the output voltage.

[0056] like Figure 4 As shown, the present invention provides a high-power pulsed discharge method, applicable to a high-power pulsed discharge device as described in any of the above embodiments, comprising:

[0057] S1. Generate a flow regulation signal through the flow regulation module, and adjust the drilling fluid flow rate in the wellbore to the target flow rate according to the flow regulation signal.

[0058] S2. Under the dynamic action of drilling fluid flowing at the target flow rate in the wellbore, an electrical signal is generated through the power generation module.

[0059] S3. The power signal is processed by the signal processing module to generate the corresponding excitation signal and obtain the frequency parameters of the power signal.

[0060] 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.

[0061] S5. The corresponding current is injected into the formation through the emitting electrode assembly according to the excitation signal.

[0062] Optionally, the flow control module includes a signal acquisition unit, a ground control unit, and a flow regulation unit;

[0063] The flow control module generates a flow regulation signal, and adjusts the drilling fluid flow rate in the wellbore to the target flow rate based on the flow regulation signal, including:

[0064] The signal acquisition unit acquires the current loop signal formed between the transmitting electrode assembly and the formation after the last transmitting current.

[0065] The ground control unit generates a flow regulation signal based on the current return signal;

[0066] The flow rate of drilling fluid in the wellbore is adjusted to the target flow rate based on the flow rate adjustment signal by the flow rate adjustment unit.

[0067] Optionally, a flow regulation signal is generated by the ground control unit based on the current return signal, including:

[0068] The preset amplitude and preset frequency of the excitation signal required for the current emission current of the transmitting electrode assembly are determined based on the current loop signal.

[0069] The target flow rate of drilling fluid corresponding to the preset amplitude and preset frequency is determined according to the preset matching relationship; wherein, the preset matching relationship represents the drilling fluid flow rate corresponding to different amplitudes and different frequencies.

[0070] Optionally, the signal processing module includes a rectification and regulation module, a high-voltage chopper module, and a frequency detection module;

[0071] The power signal is then processed by the signal processing module to generate the corresponding excitation signal and obtain the frequency parameters of the power signal, including:

[0072] The three-phase AC power output from the power generation module is converted into DC power through a rectifier and voltage regulator module;

[0073] The DC power is output as an excitation signal with a preset amplitude and preset frequency through a high-voltage chopper module;

[0074] The frequency of the power signal output by the power generation module is obtained through the frequency detection module.

[0075] Alternatively, the operation of the high-power pulsed discharge method will be described using another embodiment, such as... Figure 5 As shown:

[0076] The surface interface device and computer send flow regulation commands to the electronic water pump to adjust the drilling fluid flow rate to the target drilling fluid flow rate.

[0077] Secondly, the signal processing module processes the power signal to generate the corresponding excitation signal and obtain the frequency parameters of the power signal.

[0078] 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.

[0079] Secondly, the signal acquisition module collects relevant data (current loop signal) and transmits it to the ground decoding device and computer;

[0080] Finally, the procedure and personnel determine whether the electrode discharge parameters (emission power and emission frequency of the emission electrode assembly) need to be adjusted. If adjustment is required, different instructions are sent to the electronic water pump to change the relevant discharge parameters. If no adjustment is required, the electrode is excited according to the previous preset procedure.

[0081] Those skilled in the art will recognize that this invention can be implemented as a system, method, or computer program product. Therefore, this disclosure can be embodied in the following forms: it can be entirely hardware, entirely software (including firmware, resident software, microcode, etc.), or a combination of hardware and software, generally referred to herein as a "circuit," "module," or "system." Furthermore, in some embodiments, the invention can also be implemented as a computer program product contained in one or more computer-readable media, which 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, apparatuses, or devices, or any combination thereof.

[0082] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A high-power pulsed 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 the target flow rate according to the flow control signal; The power generation module is installed in the drilling fluid and is used to generate an electrical signal under the power of the drilling fluid flowing in the wellbore at the target flow rate. 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. 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 the target value. The transmitting electrode assembly is electrically connected to the downhole control module and is used to inject a corresponding current into the formation according to the excitation signal; 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 acquire the current loop signal formed between the transmitting electrode assembly and the formation after the last transmitting current. The ground control unit is used to generate a flow regulation signal based on the current loop signal; The flow rate adjustment unit is used to adjust the flow rate of drilling fluid in the wellbore to the target flow rate according to the flow rate adjustment signal.

2. The apparatus according to claim 1, characterized in that, The flow regulation unit employs an electronic water pump, which is installed in the drilling fluid within the wellbore and is communicatively connected to the surface control unit; it is used to adjust the flow rate of the drilling fluid in the wellbore to the target flow rate.

3. The apparatus according to claim 1, characterized in that, The ground control unit is specifically used for: The preset amplitude and preset frequency of the excitation signal required for the current emission current of the transmitting electrode assembly are determined based on the current loop signal. The target flow rate of drilling fluid corresponding to the preset amplitude and preset frequency is determined according to the preset matching relationship; wherein, the preset matching relationship represents the drilling fluid flow rate corresponding to different amplitudes and different frequencies.

4. The apparatus according to any one of claims 1-3, characterized in that, The signal processing module includes a rectification and voltage regulation module, a high-voltage chopper module, and a frequency detection module; The rectifier and voltage regulator module is used to convert the three-phase AC power output from the power generation module into DC power. The high-voltage chopper module is used to output the DC power as an excitation signal with 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.

5. The apparatus according to claim 1, characterized in that, The power generation module uses a turbine generator.

6. A high-power pulsed discharge method, characterized in that, The device is applied to the high-power pulsed discharge device as described in any one of claims 1-5, comprising: A flow regulation signal is generated by the flow regulation module, and the flow rate of drilling fluid in the wellbore is adjusted to the target flow rate according to the flow regulation signal. Under the dynamic action of drilling fluid flowing at the target flow rate in the wellbore, an electrical signal is generated through the power generation module; The power signal is processed by the signal processing module to generate a corresponding excitation signal and obtain the frequency parameters of the power signal. 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; The corresponding current is injected into the formation according to the excitation signal by the transmitting electrode assembly.

7. The method according to claim 6, characterized in that, The flow control module includes a signal acquisition unit, a ground control unit, and a flow regulation unit; The flow control module generates a flow regulation signal, and adjusts the drilling fluid flow rate in the wellbore to the target flow rate according to the flow regulation signal, including: The signal acquisition unit acquires the current loop signal formed between the transmitting electrode assembly and the formation after the last transmitting current. The ground control unit generates a flow regulation signal based on the current loop signal; The flow rate of drilling fluid in the wellbore is adjusted to the target flow rate according to the flow rate adjustment signal by the flow rate adjustment unit.

8. The method according to claim 7, characterized in that, The process of generating a flow regulation signal via a ground control unit based on the current loop signal includes: The preset amplitude and preset frequency of the excitation signal required by the transmitting electrode assembly for the current transmitting current are determined based on the current loop signal. The target flow rate of drilling fluid corresponding to the preset amplitude and preset frequency is determined according to the preset matching relationship; wherein, the preset matching relationship represents the drilling fluid flow rate corresponding to different amplitudes and different frequencies.

9. The method according to claim 8, characterized in that, The signal processing module includes a rectification and voltage regulation module, a high-voltage chopper module, and a frequency detection module; The power signal is then processed by a signal processing module to generate a corresponding excitation signal and obtain the frequency parameters of the power signal, including: The three-phase AC power output from the power generation module is converted into DC power through a rectifier and voltage regulator module; The DC power is output as an excitation signal with a preset amplitude and preset frequency through a high-voltage chopper module; The frequency of the power signal output by the power generation module is obtained through the frequency detection module.

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