Piezoelectric ceramic acoustic wave transducer and oil-gas well underground acoustic wave communication device charging method thereof

Abstract

The invention discloses a piezoelectric ceramic acoustic wave transducer and a charging method of an oil-gas well underground acoustic wave communication device thereof, and belongs to the technical field of ground and underground two-way wireless communication. Comprising the steps that a piezoelectric ceramic sound wave transducer of underground equipment is used for obtaining mechanical energy generated by vibration of an underground oil pipe column and converting the mechanical energy into electric energy or receiving charging sound waves emitted by a sound wave emitting device of ground equipment to the underground equipment and converting the charging sound waves into electric energy to charge an oil and gas well underground sound wave communication device. The piezoelectric ceramic acoustic wave transducer comprises a stainless steel protective sleeve, a laminated structure, a fastening bolt and positive and negative pole signal lines. According to the invention, environmental energy of underground equipment is efficiently utilized, self-sufficient charging of the underground wireless equipment is realized through transmission and conversion of sound wave signals, dependence on a high-capacity battery is reduced, the problem that electric energy of the underground wireless equipment is limited is solved, the service life of the underground equipment is also remarkably prolonged, and the underground wireless equipment can be charged by self. The mining efficiency and safety of an oil and gas well are improved, and the mining cost is greatly reduced.

Description

Technical Field

[0001] The invention relates to a piezoelectric ceramic acoustic wave transducer and a charging method of an acoustic wave communication device for an oil and gas well, belonging to the technical field of two-way wireless communication between the ground and the well. Background Art

[0002] In the case of limited size and battery power of wireless equipment in oil and gas wells, in order to extend the working life of downhole equipment as much as possible, existing technologies mainly focus on the problem of increasing the source of battery power and saving energy. In terms of increasing the source of power, it is mainly achieved by adopting more efficient batteries and promoting renewable energy. In terms of saving energy, it focuses on improving the energy efficiency of equipment, such as using energy-saving motors and transmission devices, and optimizing the low-power operation mode and working time of equipment to avoid unnecessary energy consumption. In addition, energy-saving measures in the construction industry have also been borrowed into downhole equipment, such as optimizing equipment form, using energy-saving materials, and strengthening thermal insulation to reduce the energy consumption of equipment. At the same time, it is equipped with an intelligent energy management system to monitor and control energy usage, minimize battery power consumption, and extend the working time of downhole equipment to improve the extraction efficiency of oil and gas resources and reduce the high cost caused by replacing downhole equipment.

[0003] Although the existing technology has made some progress in saving electricity for underground equipment, there are still a series of technical problems. First, in terms of energy utilization, although the introduction of energy-saving equipment and technology helps to reduce energy consumption, the complexity and particularity of the underground environment of oil and gas wells limit the improvement of the energy efficiency of these equipment. For example, the performance and life of some energy-saving motors and transmission devices may be affected in the high temperature and high pressure environment underground. Secondly, in terms of energy management, although the application of energy monitoring systems helps to monitor and repair the problem of excessive energy consumption in real time, the underground space of oil and gas wells is very limited, making the deployment of energy monitoring systems underground very difficult. At the same time, due to the limitations of underground wireless communication conditions, the real-time transmission and processing of monitoring data also face great challenges. In addition, the application of conventional renewable energy in underground equipment is not feasible. Due to factors such as limited underground space and lack of light, the use of renewable energy such as solar energy is limited. And the feasibility of renewable energy such as wind energy in underground applications is also very small.

[0004] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgement or any form of suggestion that the information constitutes the prior art already known to ordinary technicians in this field. Summary of the invention

[0005] The technical problem to be solved by the present invention is: under the condition that the battery power of underground wireless equipment is limited, how to effectively implement the strategy of increasing the source and reducing the cost of battery power to maximize the working life of the underground wireless equipment.

[0006] In order to solve the above technical problems, the present invention is implemented by adopting the following technical solutions.

[0007] In a first aspect, the present invention provides a piezoelectric ceramic acoustic wave transducer, comprising: The stainless steel protective casing has an internal thread and a sealing component for sealing connection at the top and an external thread fixedly connected to the downhole oil pipe string at the bottom, so as to realize efficient acoustic wave coupling between the laminated structure and the downhole oil pipe string; The laminated structure includes a plurality of piezoelectric ceramic sheets which are stacked and connected in an orderly manner, are located in the stainless steel protective sleeve, are fixedly connected to the stainless steel protective sleeve by fastening bolts, and are used to generate sound waves by stretching and deforming after being stimulated by an alternating current signal or to generate electric charges by receiving charging sound waves; A fastening bolt is used to apply pre-compression stress to the laminated structure, so that the laminated structure produces a certain pre-compression deformation to generate or receive sound waves; The positive and negative signal lines are respectively connected to the positive and negative electrodes of each layer of piezoelectric ceramic sheets in the laminated structure to form a complete circuit, which is used to receive external electrical signals and transmit them to the laminated structure to cause the laminated structure to produce expansion and contraction deformation and transmit the charges generated by the laminated structure receiving sound waves to the external circuit.

[0008] In a second aspect, the present invention provides a method for charging an acoustic wave communication device in an oil and gas well, comprising: According to the currently set charging mode, the piezoelectric ceramic acoustic wave transducer described in the first aspect is arranged underground to obtain the mechanical energy generated by the vibration of the underground oil pipe string and convert it into electrical energy; or, according to the currently set charging mode, based on the piezoelectric ceramic acoustic wave transducer described in claim 1, the charging sound waves emitted by the underground equipment by the sound wave transmitting device of the ground equipment are converted into electrical energy to charge the underground acoustic wave communication device of the oil and gas well.

[0009] Furthermore, a method for charging a downhole acoustic wave communication device of an oil and gas well by converting mechanical energy generated by vibration of a downhole oil pipe string into electrical energy using a piezoelectric ceramic acoustic wave transducer of downhole equipment includes: Use the piezoelectric ceramic acoustic transducer of the downhole equipment to obtain the mechanical energy generated by the vibration of the downhole oil pipe string; Based on the piezoelectric ceramic acoustic wave transducer, the mechanical energy is converted into an electrical signal in the charging frequency band by utilizing the piezoelectric effect; Transmitting the charging frequency band electrical signal to the rectification and charge amplification unit, performing rectification processing to convert it into a direct current signal and amplifying the charge to obtain a processed direct current signal; transmitting the processed direct current signal to a supercapacitor for charge storage; The electric energy stored in the supercapacitor is boosted and transmitted to the battery pack and the power circuit unit to charge the battery; When the downhole acoustic wave communication device of the oil and gas well communicates with the ground equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the downhole acoustic wave communication device of the oil and gas well and other circuits to provide electric energy.

[0010] Furthermore, the method for receiving the charging sound waves emitted by the downhole equipment from the sound wave transmitting device of the ground equipment and converting them into electric energy to charge the downhole sound wave communication device of the oil and gas well includes: The acoustic wave transmission frequency band between the underground and the ground is divided into a two-way communication frequency band and a charging frequency band; Based on the first bandpass filter configured according to the two-way communication frequency band, two-way communication is performed between the underground and the surface; Based on the second bandpass filter configured according to the charging frequency band, the downhole acoustic wave communication device of the oil and gas well is charged.

[0011] Further, based on the first bandpass filter configured according to the two-way communication frequency band, two-way communication is performed between the underground and the surface, including: Using the surface equipment to transmit a sound wave signal in a two-way communication frequency band according to a communication control instruction or a data request to wake up a wake-up circuit unit of the underground equipment; The acoustic wave transceiver switch of the downhole equipment is set to the receiving channel by default, and the acoustic wave signal of the two-way communication frequency band is received by the piezoelectric ceramic acoustic wave transducer and converted into an electrical signal, and the electrical signal is filtered through a first bandpass filter to obtain a filtered electrical signal of the two-way communication frequency band; Continuously detecting the signal strength of the electrical signal in the two-way communication frequency band using a wake-up circuit unit of the downhole equipment; When the signal strength of the electrical signal in the two-way communication frequency band exceeds a threshold, waking up the processor unit using the wake-up circuit unit; The processor unit is used to wake up the sound wave signal acquisition unit, collect the electric signal of the two-way communication frequency band after filtering, and send it to the processor unit for analysis, processing and demodulation to obtain a communication control instruction or data request; According to the control instruction or data request, the processor unit is used to control the downhole parameter acquisition unit to acquire the downhole equipment parameter data and modulate the acquired downhole equipment parameter data onto an electrical signal in a two-way communication frequency band, and then the electrical signal is processed and amplified by the acoustic wave transmission signal and the amplification unit to obtain an amplified electrical signal containing the acquired downhole equipment parameter data; The processor unit sends an acoustic wave transceiver switching switch signal to switch the switch to the transmission channel, and the amplified electrical signal containing the collected downhole equipment parameter data is sent to the piezoelectric ceramic acoustic wave transducer through the transmission channel for electro-acoustic conversion, converted into an acoustic wave signal, and transmitted to the surface equipment.

[0012] Furthermore, based on the second bandpass filter configured according to the charging frequency band, charging the downhole acoustic wave communication device of the oil and gas well includes: The ground equipment transmits the acoustic wave signal in the charging frequency band to charge the underground equipment according to the charging control instruction; The acoustic wave transceiver switch of the downhole equipment is set to the receiving channel by default, and the acoustic wave signal of the charging frequency band is received by the piezoelectric ceramic acoustic wave transducer, converted into an electrical signal, and filtered through a second bandpass filter to obtain a filtered charging frequency band electrical signal; Transmitting the filtered charging frequency band electrical signal to the rectification and charge amplification unit, rectifying it to convert it into a direct current signal and amplifying the charge to obtain a processed direct current signal; transmitting the processed direct current signal to a supercapacitor for charge storage; The electric energy stored in the supercapacitor is boosted and transmitted to the battery pack and the power circuit unit to charge the battery; When the downhole acoustic wave communication device of the oil and gas well communicates with the ground equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the downhole acoustic wave communication device of the oil and gas well and other circuits to provide electric energy.

[0013] Furthermore, the charging mode includes a simple start-up mode, a threshold trigger mode and an intelligent control mode.

[0014] Furthermore, the simple start-up mode includes: when the downhole equipment enters the sleep mode, starting the surface equipment to transmit a sound wave signal in the charging frequency band to the downhole equipment.

[0015] Furthermore, the threshold trigger mode includes: after each two-way communication between the underground and the ground is completed, the ground equipment is used to compare the battery pack power value in the received downhole equipment parameter data with a preset threshold value. When the battery pack power value is lower than the preset threshold value, the ground equipment is started to transmit a sound wave signal in the charging frequency band to the downhole equipment.

[0016] Furthermore, the intelligent control mode includes: After each two-way communication between the underground and the ground is completed, the ground equipment is used to perform optimization calculations according to the change trend of the parameter data of the underground equipment, and the optimization calculation results are used to determine whether to start the ground equipment to transmit the sound wave signal of the charging frequency band to the underground equipment, as well as the time and intensity of the sound wave signal of the charging frequency band; The downhole equipment parameter data includes the power consumption of the downhole equipment, the battery pack power, and the operating status of the downhole pump.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The piezoelectric ceramic acoustic wave transducer proposed in the present invention utilizes a fixed connection between a stainless steel protective casing and a downhole oil pipe string to realize efficient acoustic wave coupling transmission between the piezoelectric ceramic laminate structure and the downhole oil pipe string. It not only enhances the propagation efficiency of the acoustic waves generated by the piezoelectric ceramic laminate structure to the oil pipe string when transmitting acoustic waves, but also can efficiently couple and transmit the acoustic wave energy on the oil pipe string to the piezoelectric ceramic laminate structure when receiving acoustic waves, thereby realizing high-sensitivity reception of acoustic wave communication and providing a sustainable charging energy source for the operation of downhole equipment.

[0018] 2. The piezoelectric ceramic acoustic wave transducer proposed in the present invention also uses fastening bolts to apply pre-compression stress to a laminated structure composed of a number of orderly stacked and connected piezoelectric ceramic sheets, so that the laminated structure can generate sound waves more effectively when deformed, and can generate more charges when receiving charging sound waves. By pre-compressing the piezoelectric ceramic sheets, the piezoelectric ceramic laminate can be prevented from excessive elongation and deformation, resulting in damage or even rupture. This stacking optimization method not only improves the efficiency and control accuracy of acoustic wave transmission and reception, but also significantly improves the efficiency of electroacoustic conversion, providing a stable and efficient energy solution for charging underground wireless equipment, and also improves the reliability of the acoustic wave transducer.

[0019] 3. The present invention successfully converts mechanical energy into electrical energy by utilizing the mechanical energy generated by the vibration of the downhole oil pipe string and combining it with the piezoelectric effect of the piezoelectric ceramic acoustic wave transducer, thus providing a stable charging source for the acoustic wave communication device in the oil and gas well. In addition, the acoustic wave signals of a specific frequency band emitted by the ground equipment can also be converted into electrical energy, which not only efficiently utilizes the environmental energy of the downhole equipment, but also realizes the self-sufficient charging of the downhole wireless equipment through the transmission and conversion of the acoustic wave signal, greatly reducing the dependence on large-capacity batteries, solving the problem of limited electrical energy of downhole wireless equipment in the prior art, and also significantly extending the working life of the downhole equipment, improving the mining efficiency and safety of oil and gas wells, and greatly reducing the mining cost.

[0020] 4. The charging method of the present invention innovatively sets a simple start mode, a threshold trigger mode and an intelligent control mode, which can flexibly respond to different underground environments and equipment states, thereby meeting diverse charging needs. At the same time, the present invention also divides the two-way communication frequency band and the charging frequency band, and the present invention also ensures that the two-way communication between the underground and the ground is not affected by the charging process, ensuring the continuity and stability of the two-way communication between the underground and the ground. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The figure is a structural schematic diagram of a charging method for an acoustic wave communication device in an oil and gas well provided by an embodiment of the present invention; Figure 2 FIG. 1 is a schematic diagram of the overall structure of a piezoelectric ceramic acoustic wave transducer provided by an embodiment of the present invention; Figure 3 Shown is a schematic diagram of a process flow of a simple start mode provided by an embodiment of the present invention; Figure 4 FIG. 1 is a flow chart of a threshold trigger mode provided by an embodiment of the present invention; Figure 5 The figure is a schematic diagram of the process of the intelligent control mode provided by an embodiment of the present invention.

[0022] Figure numerals: 1-stainless steel protective sleeve; 2-internal thread; 3-sealing component; 4-external thread; 5-piezoelectric ceramic plate; 6-fastening bolt; 7-positive and negative signal lines. DETAILED DESCRIPTION

[0023] The technical solution of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solution of the present invention, rather than limitations on the technical solution of the present invention. The embodiments of the present invention and the technical features in the embodiments may be combined with each other unless there is a conflict.

[0024] The term "and / or" is only a description of the association relationship between related objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " generally indicates that the related objects are in an "or" relationship. Example

[0025] like Figure 2 As shown, this embodiment introduces a piezoelectric ceramic acoustic wave transducer, which is used to set the piezoelectric ceramic acoustic wave transducer described in this embodiment underground according to the currently set charging mode, obtain the mechanical energy generated by the vibration of the underground oil pipe string and convert it into electrical energy; or, according to the currently set charging mode, based on the piezoelectric ceramic acoustic wave transducer described in this embodiment, receive the charging sound waves emitted by the underground equipment by the sound wave transmitting device of the ground equipment and convert them into electrical energy to charge the underground acoustic wave communication device of the oil and gas well.

[0026] The piezoelectric ceramic acoustic wave transducer provided in this embodiment includes a stainless steel protective sleeve 1 , a laminated structure, fastening bolts 6 , and positive and negative signal lines 7 .

[0027] A stainless steel protective casing 1 is provided with an internal thread 2 and a sealing component 3 for sealing connection at the top, and an external thread 4 fixedly connected to a downhole oil pipe string at the bottom, which is used to couple and transmit the sound waves generated by the laminated structure to the downhole oil pipe string, causing the downhole oil pipe string to vibrate, so as to realize the propagation of sound waves in the oil pipe string; or vice versa, coupling and transmitting the sound wave energy on the oil pipe string to the piezoelectric ceramic laminated structure, so as to realize the reception of sound wave signals.

[0028] In this embodiment, the stainless steel protective sleeve serves as the outer shell of the piezoelectric ceramic acoustic wave transducer. The top is designed with an internal thread and an O-ring sealing surface as a sealing component for achieving a reliable sealed connection with other components of the downhole equipment. The bottom is provided with an external thread for convenient fixed connection with the downhole oil pipe string. The design of the stainless steel protective sleeve enables efficient acoustic wave coupling between the laminated structure and the oil pipe string. When the downhole equipment transmits sound waves, the sound waves generated by the laminated structure can be efficiently coupled and transmitted to the downhole oil pipe string, thereby causing the downhole oil pipe string to vibrate, so as to achieve the propagation of sound waves in the oil pipe string; conversely, when the downhole equipment receives sound waves, the sound wave energy on the oil pipe string can be efficiently coupled and transmitted to the piezoelectric ceramic laminated structure, thereby achieving efficient reception of sound wave signals.

[0029] The laminated structure includes a plurality of orderly stacked and connected piezoelectric ceramic sheets 5, which are located in the stainless steel protective sleeve 1 and fixedly connected to the stainless steel protective sleeve 1 by fastening bolts, and are used for generating sound waves by stretching and deforming under the stimulation of external alternating current signals or generating electric charges by receiving charging sound waves.

[0030] In this embodiment, the laminated structure is the core component of the piezoelectric ceramic acoustic wave transducer, including a number of piezoelectric ceramic sheets stacked in an orderly manner and tightly bonded. The laminated structure composed of a number of piezoelectric ceramic sheets is located inside the stainless steel protective sleeve and is fixed to the stainless steel protective sleeve by fastening bolts to form a sealed whole. When the external AC signal is transmitted to the laminated structure through the positive and negative polar signal lines, the piezoelectric ceramic sheets will undergo expansion and contraction deformation, thereby generating sound waves. On the contrary, when the laminated structure receives a charging sound wave, the piezoelectric ceramic sheets will expand and contract as the sound wave vibrates, thereby generating an electric charge. The charge generated by the piezoelectric ceramic sheets can be transmitted to the external circuit through the signal line for collection and utilization.

[0031] The tightening bolts 6 are used to apply pre-compression stress to the laminated structure, so that the laminated structure can deform and generate sound waves more effectively and reliably.

[0032] In this embodiment, the function of the tightening bolts is to apply pre-compression stress to the laminated structure, so that the laminated structure produces a certain pre-compression deformation, so as to ensure that the laminated structure can maintain stability and consistency during the deformation process, thereby improving the efficiency of sound wave generation, and at the same time avoiding excessive elongation deformation of the piezoelectric ceramic laminate, which may cause damage or even rupture.

[0033] The positive and negative signal lines 7 are respectively connected to the positive and negative electrodes of each layer of piezoelectric ceramic sheets in the laminated structure to form a complete circuit, which is used to receive external electrical signals and transmit them to the laminated structure to cause the laminated structure to produce expansion and contraction deformation and transmit the charges generated by the laminated structure receiving sound waves to the external circuit.

[0034] In this embodiment, the positive and negative signal lines are connected to both sides of the laminate structure to form a complete circuit. The positive and negative signal lines are not only responsible for receiving external electrical signals and transmitting them to the laminate structure, but also responsible for transmitting the charge generated by the laminate structure receiving the charging sound wave to the external circuit, realizing the mutual conversion between electrical signals and sound waves. Example

[0035] like Figure 1 As shown, based on the same inventive concept as other embodiments, this embodiment introduces a charging method for an underground acoustic wave communication device in an oil and gas well, comprising: Method 1: According to the currently set charging mode, the piezoelectric ceramic acoustic wave transducer described in Example 1 is set underground to obtain the mechanical energy generated by the vibration of the underground oil pipe string and convert it into electrical energy.

[0036] Step 1: Use the piezoelectric ceramic acoustic transducer of the downhole equipment to obtain the mechanical energy generated by the vibration of the downhole oil pipe string.

[0037] The piezoelectric ceramic acoustic wave transducer provided by the present invention can convert mechanical energy into electrical energy. When the piezoelectric ceramic structure in the piezoelectric ceramic acoustic wave transducer is subjected to an external force and produces expansion and contraction deformation, the internal charge distribution will change to generate a potential difference, that is, electrical energy.

[0038] This embodiment realizes the preliminary conversion from mechanical energy to electrical energy by capturing the mechanical energy generated by the vibration of the oil pipe string and converting it into electrical energy.

[0039] Step 2: Using the piezoelectric effect based on a piezoelectric ceramic acoustic wave transducer, the mechanical energy is converted into an alternating current signal.

[0040] The piezoelectric effect is a phenomenon in which piezoelectric materials generate electric charges when subjected to external forces, which enables the piezoelectric ceramic acoustic wave transducer to convert mechanical energy into an alternating current signal. This embodiment further converts the captured mechanical energy into an alternating current signal for direct transmission and processing.

[0041] Step 3: Transmit the AC signal to the rectification and charge amplification unit, perform rectification processing to convert it into a DC signal and amplify the charge to obtain a processed DC signal.

[0042] Rectification is the process of converting alternating current into direct current, while charge amplification is the process of increasing the amplitude of an electrical signal.

[0043] In this embodiment, the AC signal is converted into a stable DC signal and the amplitude of the signal is increased, thereby obtaining a stable DC signal with sufficient amplitude, which provides conditions for electric energy storage.

[0044] Step 4: Transmitting the processed DC signal to a supercapacitor for charge storage.

[0045] A supercapacitor is a component that can store large amounts of electrical charge and can charge and discharge much faster than a traditional battery.

[0046] In this embodiment, the processed DC signal is stored in a supercapacitor, thereby realizing the storage of electric energy and providing an energy source for subsequent voltage boost processing and battery charging.

[0047] Step 5: Boost the electric energy stored in the supercapacitor and transmit it to the battery pack and the power circuit unit.

[0048] Boosting is the process of converting low voltage into high voltage, which can meet the voltage requirements of different devices.

[0049] This embodiment boosts the electric energy in the supercapacitor to a charging voltage level suitable for the battery pack, ensuring that the electric energy can be safely and effectively transmitted to the battery pack and the power circuit unit, thereby realizing the charging of the battery pack.

[0050] Step 6: When the oil and gas well downhole acoustic wave communication device communicates with the ground equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the oil and gas well downhole acoustic wave communication device and other circuits to provide electric energy.

[0051] The power circuit unit is responsible for the distribution and transmission of electrical energy to ensure that the device can be charged and work normally.

[0052] This embodiment will effectively supplement the electric energy in the battery pack and provide continuous power support for the operation of the downhole acoustic wave communication device in the oil and gas well.

[0053] Method 2: According to the currently set charging mode, based on the piezoelectric ceramic acoustic wave transducer described in Example 1, the acoustic wave transmitting device of the receiving ground equipment converts the charging acoustic waves emitted by the downhole equipment into electrical energy to charge the downhole acoustic wave communication device of the oil and gas well.

[0054] Step 1: Divide the acoustic wave transmission frequency band between the underground and the ground into a two-way communication frequency band and a charging frequency band.

[0055] It is divided into a two-way communication frequency band and a charging frequency band, making data transmission between the underground and the ground more efficient and accurate, reducing communication interference and bit error rate, while also solving the problem of power supply for underground wireless equipment, improving the endurance and stability of the equipment, and providing a strong guarantee for timely, accurate and long-term grasp of the dynamic changes in well conditions during oil and gas well production, thereby formulating an effective production work system.

[0056] In this embodiment, based on the first bandpass filter configured according to the two-way communication frequency band, two-way communication between the underground and the surface is performed, including: Using the surface equipment to transmit a sound wave signal in a two-way communication frequency band according to a communication control instruction or a data request to wake up a wake-up circuit unit of the underground equipment; The acoustic wave transceiver switch of the downhole equipment is set to the receiving channel by default, and the acoustic wave signal of the two-way communication frequency band is received by the piezoelectric ceramic acoustic wave transducer and converted into an electrical signal, and the electrical signal is filtered through a first bandpass filter to obtain a filtered electrical signal of the two-way communication frequency band; Continuously detecting the signal strength of the electrical signal in the two-way communication frequency band using a wake-up circuit unit of the downhole equipment; When the signal strength of the electrical signal in the two-way communication frequency band exceeds a threshold, waking up the processor unit using the wake-up circuit unit; The processor unit is used to wake up the sound wave signal acquisition unit, collect the electric signal of the two-way communication frequency band after filtering, and send it to the processor unit for analysis, processing and demodulation to obtain a communication control instruction or data request; According to the control instruction or data request, the processor unit is used to control the downhole parameter acquisition unit to acquire the downhole equipment parameter data and modulate the acquired downhole equipment parameter data onto an electrical signal in a two-way communication frequency band, and then the electrical signal is processed and amplified by the acoustic wave transmission signal and the amplification unit to obtain an amplified electrical signal containing the acquired downhole equipment parameter data; The processor unit sends an acoustic wave transceiver switching switch signal to switch the switch to the transmission channel, and the amplified electrical signal containing the collected downhole equipment parameter data is sent to the piezoelectric ceramic acoustic wave transducer through the transmission channel for electro-acoustic conversion, converted into an acoustic wave signal, and transmitted to the surface equipment.

[0057] Step 2: Based on the second bandpass filter configured according to the charging frequency band, the downhole acoustic wave communication device of the oil and gas well is charged.

[0058] This embodiment utilizes the propagation characteristics of the acoustic wave signal in the charging frequency band, transmits the acoustic wave signal through the surface equipment, and the downhole equipment receives and converts it into electrical energy, thereby charging the acoustic wave communication device. In the whole process, the second bandpass filter plays the role of screening and filtering the acoustic wave signal in a specific frequency band.

[0059] Step 3: Based on the second bandpass filter configured according to the charging frequency band, charging the downhole acoustic wave communication device of the oil and gas well, including: Step 3.1: The ground equipment transmits an acoustic wave signal in the charging frequency band to charge the underground equipment according to the charging control instruction.

[0060] In this embodiment, after receiving the charging control instruction, the surface equipment generates and transmits a sound wave signal of the charging frequency band for charging the downhole equipment. The sound wave transceiver switch of the downhole equipment is set to the receiving channel by default to ensure that the charging channel of the downhole equipment remains in a working state, and the environmental vibration energy of the downhole oil pipe string and the charging sound wave energy emitted by the surface equipment are collected at any time, thereby ensuring the continuity and reliability of the charging of the downhole equipment.

[0061] Step 3.2: Receive the sound wave signal in the charging frequency band using a piezoelectric ceramic sound wave transducer, convert it into an electrical signal, and filter it through a second filter to obtain a filtered alternating current signal in the charging frequency band.

[0062] In this embodiment, the piezoelectric ceramic acoustic wave transducer receives the acoustic wave signal and converts it into an electrical signal. The second bandpass filter further screens and filters the electrical signal to ensure that only the signal in the charging frequency band is retained, thereby improving the purity and stability of the electrical signal. Due to the high sensitivity of the piezoelectric ceramic acoustic wave transducer in receiving and converting acoustic wave signals, even small environmental vibrations or the energy of charging acoustic wave signals can be effectively collected and converted into electrical energy, and stored through the subsequent charging processing circuit, ensuring the effectiveness of the underground charging energy source collection.

[0063] Step 3.3: The filtered electrical signal is transmitted to the rectification and charge amplification unit, which is rectified and converted into a direct current signal and the charge is amplified to obtain a processed direct current signal.

[0064] Step 3.4: transmitting the processed DC signal to a supercapacitor for charge storage; Step 3.5: Boosting the electric energy stored in the supercapacitor and transmitting it to the battery pack and the power circuit unit to charge the battery; Step 3.6: When the oil and gas well downhole acoustic wave communication device communicates with the surface equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the oil and gas well downhole acoustic wave communication device and other circuits to provide electric energy. Example

[0065] Based on the same inventive concept as Example 1, this example focuses on introducing a charging mode set by a charging method for an underground acoustic wave communication device in an oil and gas well.

[0066] The charging modes of a charging method for a downhole acoustic wave communication device in an oil and gas well provided by the present invention include a simple start-up mode, a threshold triggering mode and an intelligent control mode.

[0067] Simple start mode: easy to operate. When the downhole equipment enters sleep mode, the ground equipment can start transmitting the acoustic wave signal in the charging frequency band to the downhole equipment to achieve fast charging. It is suitable for emergency situations where the downhole equipment needs regular maintenance or the power is about to run out. It can ensure that the downhole equipment can resume working status in the shortest time.

[0068] like Figure 3 As shown, the simple start-up mode includes: when the downhole equipment enters the sleep mode, starting the surface equipment to transmit the sound wave signal in the charging frequency band to the downhole equipment.

[0069] When the downhole equipment is in sleep mode, only the wake-up circuit unit and charging-related circuits remain in working state. During this period, the surface equipment continues to transmit the acoustic wave signal of the charging frequency band during the downhole sleep cycle. The downhole equipment wakes up regularly at the set time interval, collects the downhole equipment parameter data, and modulates the downhole equipment parameter data to the uplink frequency of the acoustic wave communication and sends it to the surface equipment.

[0070] The surface equipment enters the communication cycle at the agreed time interval, stops transmitting the acoustic wave signal in the charging frequency band, and detects and receives the communication signal sent by the downhole equipment instead. The surface equipment demodulates the received acoustic wave modulation signal to obtain the parameter data of the downhole equipment, and sends the command data to the downhole through the downlink frequency of the acoustic wave communication.

[0071] After receiving the acoustic wave modulation signal, the downhole equipment also demodulates it to obtain the command data from the ground, and performs corresponding operations according to the instructions. After completion, it enters the sleep cycle again.

[0072] Threshold trigger mode: By monitoring the battery pack power value in the parameter data of the underground equipment, when the battery pack power value is lower than the preset threshold, the ground equipment is automatically started to emit charging sound waves. The intelligent trigger mechanism not only avoids excessive consumption of electrical energy, but also ensures that the underground equipment can continue to work stably when the power is sufficient, greatly extending the service life of the equipment.

[0073] like Figure 4 As shown, the threshold trigger mode includes: after each two-way communication between the underground and the ground is completed, the ground equipment is used to compare the battery pack power value in the received underground equipment parameter data with the preset threshold value. When the battery pack power value is lower than the preset threshold value, the ground equipment is started to transmit a sound wave signal in the charging frequency band to the underground equipment.

[0074] Intelligent control mode: Intelligently control the emission time and intensity of the charging acoustic wave signal according to the changing trend of the parameter data of the downhole equipment, which not only ensures that the downhole equipment can be charged in time when needed, but also avoids unnecessary waste of electricity, thereby improving the working efficiency and service life of the downhole equipment.

[0075] like Figure 5 As shown, the intelligent control mode includes: after each two-way communication between the underground and the ground, the ground equipment is used to perform optimization calculation according to the change trend of the parameter data of the underground equipment, and whether to start the ground equipment to transmit the sound wave signal of the charging frequency band to the underground equipment and the time and intensity of the sound wave signal of the charging frequency band are determined according to the optimization calculation result. The parameter data of the underground equipment includes the power consumption of the underground equipment, the battery pack power, and the operating status of the underground pump.

[0076] In summary, the piezoelectric ceramic acoustic wave transducer proposed in the present invention utilizes the fixed connection between the stainless steel protective casing and the downhole oil pipe string to realize efficient acoustic wave coupling and transmission between the piezoelectric ceramic laminated structure and the downhole oil pipe string, which not only enhances the propagation efficiency of the acoustic waves generated by the piezoelectric ceramic laminated structure to the oil pipe string when transmitting acoustic waves, but also can efficiently couple and transmit the acoustic wave energy on the oil pipe string to the piezoelectric ceramic laminated structure when receiving acoustic waves, thereby realizing high-sensitivity reception of acoustic wave communication and providing a sustainable charging energy source for the operation of downhole equipment.

[0077] The piezoelectric ceramic acoustic wave transducer proposed in the present invention also uses fastening bolts to apply pre-compression stress to a laminated structure composed of a number of orderly stacked and connected piezoelectric ceramic sheets, so that the laminated structure can generate sound waves more effectively when deformed, and can generate more charges when receiving charging sound waves. By pre-compressing the piezoelectric ceramic sheets, the piezoelectric ceramic laminate can be prevented from excessive elongation and deformation, resulting in damage or even rupture. This stacking optimization method not only improves the efficiency and control accuracy of sound wave transmission and reception, but also significantly improves the efficiency of electroacoustic conversion, providing a stable and efficient energy solution for charging underground wireless equipment, and also improves the reliability of the acoustic wave transducer.

[0078] The present invention successfully converts mechanical energy into electrical energy by utilizing the mechanical energy generated by the vibration of the downhole oil pipe string and combining it with the piezoelectric effect of the piezoelectric ceramic acoustic wave transducer, thus providing a stable charging source for the acoustic wave communication device in the oil and gas well. In addition, the acoustic wave signals of a specific frequency band emitted by the ground equipment can also be converted into electrical energy, which not only efficiently utilizes the environmental energy of the downhole equipment, but also realizes the self-sufficient charging of the downhole wireless equipment through the transmission and conversion of the acoustic wave signal, greatly reducing the dependence on large-capacity batteries, solving the problem of limited electrical energy of the downhole wireless equipment in the prior art, and also significantly extending the working life of the downhole wireless equipment, improving the mining efficiency and safety of the oil and gas wells, and greatly reducing the mining cost.

[0079] The charging method of the present invention innovatively sets a simple start mode, a threshold trigger mode and an intelligent control mode, which can flexibly respond to different underground environments and equipment states, thereby meeting diverse charging needs. At the same time, the present invention also divides the two-way communication frequency band and the charging frequency band to ensure that the two-way communication between the underground and the ground is not affected by the charging process, ensuring the continuity and stability of the two-way communication between the underground and the ground.

[0080] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0081] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0082] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0083] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0084] The embodiments of the present invention are described above in conjunction with the accompanying drawings, but the present invention is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present invention, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present invention and the claims, which all fall within the protection of the present invention.

Claims

1. A piezoelectric ceramic acoustic wave transducer, characterized in that: include: The stainless steel protective casing has an internal thread and a sealing component for sealing connection at the top and an external thread fixedly connected to the downhole oil pipe string at the bottom, so as to realize efficient acoustic wave coupling between the laminated structure and the downhole oil pipe string; The laminated structure includes a plurality of piezoelectric ceramic sheets which are stacked and connected in an orderly manner, are located in the stainless steel protective sleeve, are fixedly connected to the stainless steel protective sleeve by fastening bolts, and are used to generate sound waves by stretching and deforming after being stimulated by an alternating current signal or to generate electric charges by receiving charging sound waves; A fastening bolt is used to apply pre-compression stress to the laminated structure, so that the laminated structure produces a certain pre-compression deformation to generate or receive sound waves; The positive and negative signal lines are respectively connected to the positive and negative electrodes of each layer of piezoelectric ceramic sheets in the laminated structure to form a complete circuit, which is used to receive external electrical signals and transmit them to the laminated structure to cause the laminated structure to produce expansion and contraction deformation and transmit the charges generated by the laminated structure receiving sound waves to the external circuit.

2. A method for charging an acoustic wave communication device in an oil and gas well, characterized in that: include: According to the currently set charging mode, the piezoelectric ceramic acoustic wave transducer described in claim 1 is arranged underground to obtain the mechanical energy generated by the vibration of the underground oil pipe string and convert it into electrical energy; or, according to the currently set charging mode, based on the piezoelectric ceramic acoustic wave transducer described in claim 1, the charging sound waves emitted by the underground equipment by the sound wave transmitting device of the ground equipment are converted into electrical energy to charge the underground acoustic wave communication device of the oil and gas well.

3. The method for charging an oil and gas well downhole acoustic wave communication device according to claim 2, characterized in that: A method for converting mechanical energy generated by vibration of a downhole oil pipe string into electrical energy by using a piezoelectric ceramic acoustic wave transducer of downhole equipment to charge an acoustic wave communication device in an oil and gas well, comprising: Use the piezoelectric ceramic acoustic transducer of the downhole equipment to obtain the mechanical energy generated by the vibration of the downhole oil pipe string; Based on the piezoelectric ceramic acoustic wave transducer, the mechanical energy is converted into an alternating current signal by utilizing the piezoelectric effect; Transmitting the AC signal to the rectification and charge amplification unit, rectifying it to convert it into a DC signal and amplifying the charge to obtain a processed DC signal; transmitting the processed direct current signal to a supercapacitor for charge storage; The electric energy stored in the supercapacitor is boosted and transmitted to the battery pack and the power circuit unit to charge the battery; When the downhole acoustic wave communication device of the oil and gas well communicates with the ground equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the downhole acoustic wave communication device of the oil and gas well and other circuits to provide electric energy.

4. The method for charging an acoustic wave communication device for an oil and gas well according to claim 2, characterized in that: A method for charging an acoustic wave communication device in an oil and gas well by converting a charging acoustic wave emitted by an underground device into electric energy by an acoustic wave transmitting device receiving the surface device, comprising: The acoustic wave transmission frequency band between the underground and the ground is divided into a two-way communication frequency band and a charging frequency band; Based on the first bandpass filter configured according to the two-way communication frequency band, two-way communication is performed between the underground and the surface; Based on the second bandpass filter configured according to the charging frequency band, the downhole acoustic wave communication device of the oil and gas well is charged.

5. The method for charging an oil and gas well downhole acoustic wave communication device according to claim 4, characterized in that: Based on the first bandpass filter configured according to the two-way communication frequency band, two-way communication is performed between the underground and the surface, including: Using the surface equipment to transmit a sound wave signal in a two-way communication frequency band according to a communication control instruction or a data request to wake up a wake-up circuit unit of the underground equipment; The acoustic wave transceiver switch of the downhole equipment is set to the receiving channel by default, and the acoustic wave signal of the two-way communication frequency band is received by the piezoelectric ceramic acoustic wave transducer and converted into an electrical signal, and the electrical signal is filtered through a first bandpass filter to obtain a filtered electrical signal of the two-way communication frequency band; Continuously detecting the signal strength of the electrical signal in the two-way communication frequency band using a wake-up circuit unit of the downhole equipment; When the signal strength of the electrical signal in the two-way communication frequency band exceeds a threshold, waking up the processor unit using the wake-up circuit unit; The processor unit is used to wake up the sound wave signal acquisition unit, collect the electric signal of the two-way communication frequency band after filtering, and send it to the processor unit for analysis, processing and demodulation to obtain a communication control instruction or data request; According to the control instruction or data request, the processor unit is used to control the downhole parameter acquisition unit to acquire downhole equipment parameter data and modulate the acquired downhole equipment parameter data onto an electrical signal in a two-way communication frequency band, and then the electrical signal is processed and amplified by an acoustic wave transmission signal and an amplification unit to obtain an amplified electrical signal containing the acquired downhole equipment parameter data; The processor unit sends an acoustic wave transceiver switching switch signal to switch the switch to the transmission channel, and the amplified electrical signal containing the collected downhole equipment parameter data is sent to the piezoelectric ceramic acoustic wave transducer through the transmission channel for electro-acoustic conversion, converted into an acoustic wave signal, and transmitted to the surface equipment.

6. The method for charging an acoustic wave communication device for an oil and gas well according to claim 4, characterized in that: Based on the second bandpass filter configured according to the charging frequency band, charging the downhole acoustic wave communication device of the oil and gas well includes: The ground equipment transmits the acoustic wave signal in the charging frequency band to charge the underground equipment according to the charging control instruction; The acoustic wave transceiver switch of the downhole equipment is set to the receiving channel by default, and the acoustic wave signal of the charging frequency band is received by the piezoelectric ceramic acoustic wave transducer, converted into an electrical signal, and filtered through a second bandpass filter to obtain a filtered charging frequency band electrical signal; Transmitting the filtered charging frequency band electrical signal to the rectification and charge amplification unit, rectifying it to convert it into a direct current signal and amplifying the charge to obtain a processed direct current signal; transmitting the processed direct current signal to a supercapacitor for charge storage; The electric energy stored in the supercapacitor is boosted and transmitted to the battery pack and the power circuit unit to charge the battery; When the downhole acoustic wave communication device of the oil and gas well communicates with the ground equipment, the power circuit unit is used to transmit the electric energy in the battery pack to the downhole acoustic wave communication device of the oil and gas well and other circuits to provide electric energy.

7. The method for charging an acoustic wave communication device in an oil and gas well according to claim 2, characterized in that: The charging modes include a simple start-up mode, a threshold trigger mode and an intelligent control mode.

8. The method for charging an acoustic wave communication device for an oil and gas well according to claim 7, characterized in that: The simple start mode includes: When the downhole equipment enters the sleep mode, the surface equipment is started to transmit an acoustic wave signal in the charging frequency band to the downhole equipment.

9. The method for charging an acoustic wave communication device for an oil and gas well according to claim 7, characterized in that: The threshold trigger mode includes: After each two-way communication between the underground and the ground is completed, the ground equipment is used to compare the battery pack power value in the received underground equipment parameter data with the preset threshold. When the battery pack power value is lower than the preset threshold, the ground equipment is started to transmit a sound wave signal in the charging frequency band to the underground equipment.

10. The method for charging an acoustic wave communication device in a downhole oil and gas well according to claim 7, characterized in that: The intelligent control mode includes: After each two-way communication between the underground and the ground is completed, the ground equipment is used to perform optimization calculations based on the changing trend of the downhole equipment parameter data, and based on the optimization calculation results, it is decided whether to start the ground equipment to transmit the sound wave signal in the charging frequency band to the downhole equipment, as well as the time and intensity of transmitting the sound wave signal in the charging frequency band; the downhole equipment parameter data includes the power consumption of the downhole equipment, the battery pack power, and the operating status of the downhole pump.

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