Packing method, electric water injection packer and control method, device and equipment of electric water injection packer

Abstract

The invention provides a packing method, an electric water injection packer and a control method, device and equipment of the electric water injection packer, and belongs to the technical field of workover treatment. The digital quantity signal is analyzed, and underground data coding information is obtained; based on the underground data coding information, a packer operation instruction is generated; and the packer operation instruction is sent to a motor module of the packer. The packing method comprises the following steps: transmitting ground operation instruction information and packer address information to the underground by taking a pressure pulse as a signal carrier; and the packer obtains a packer operation instruction and a packer address by sensing and analyzing the pressure pulse, and setting and unsetting are completed according to the packer operation instruction on the premise that the packer address is met. By means of the method, the accuracy and reliability of setting and unsetting of the packer can be improved, meanwhile, the working efficiency is improved, and the working cost and the labor intensity of workers are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of workover operations, and in particular, to a control method for a water injection packer, a control device for a water injection packer, a control equipment for a water injection packer, a computer-readable storage medium, a pressure-controlled electric water injection packer, and a sealing method. Background Art

[0002] During the oilfield development process, water injection is an important technical measure, and packers play a crucial role. They are used to isolate different sections in the oil layer, control the position and flow rate of water injection, so as to achieve the purpose of increasing the oil recovery rate of the oilfield. It can be seen that the application amount of water injection packers in oilfield development is huge, and they play an important role in improving the development efficiency and production of the oilfield. For example, in Liaohe Oilfield, the application of water injection packers in water wells alone exceeds thousands of well times every year.

[0003] Currently, the setting and releasing process of packers is generally carried out by pressure application, rotation, lifting and lowering for setting and releasing. For conventional packers, the above setting or releasing process is completely manually operated by technicians, which is not only greatly affected by factors such as people and workover machines, but also difficult to control the actual setting success when there are many downhole packers. For electric packers, although the above setting or releasing process can be remotely controlled by technicians, it must rely on the cable connection between the surface control equipment and the packer. For packers located at a relatively deep position at the bottom of the well, there are not only problems with difficult cable connection, but also due to the connection limitation of the cable, the moving range of the electric packer may be restricted and it cannot move or adjust its position freely.

[0004] Therefore, it is necessary to design an electric control system to be equipped with an electric water injection packer to realize the intelligent control of the water injection packer, thereby improving the accuracy and reliability of the setting and releasing of the packer, as well as reducing the operation cost and the labor intensity of workers. Summary of the Invention

[0005] Aiming at the technical problem that the accuracy and reliability of setting and releasing of water injection packers in the prior art are not high, the present invention provides a control method for a water injection packer. By using this method, without relying on cable connection, ground operation instructions can be transmitted to the downhole through pressure pulses, and corresponding setting or releasing operations can be performed on the corresponding packer according to the ground operation instructions, so as to complete the intelligent control of the water injection packer and improve the accuracy and reliability of the setting and releasing of the packer.

[0006] To achieve the above object, a first aspect of the present invention provides a control method for a water injection packer. The control method includes the following steps: obtaining a digital quantity signal, where the digital quantity signal is obtained by converting a pressure pulse inside the tubing; parsing the digital quantity signal to obtain downhole data coding information; generating a packer operation instruction based on the downhole data coding information; and sending the packer operation instruction to the motor module of the packer.

[0007] In an exemplary embodiment of the present invention, the parsing the digital quantity signal to obtain downhole data coding information may include: parsing the digital quantity signal to extract a communication coding sequence, where the communication coding sequence is composed of different types of digital coding pairs arranged in different orders, and different types of digital coding pairs are composed of multiple digital codings arranged in different orders; analyzing the communication coding sequence to obtain downhole data coding information, and the downhole data coding information at least includes: surface operation instruction information, and the surface operation instruction information includes: performing a setting operation and performing an unseating operation.

[0008] In an exemplary embodiment of the present invention, the digital coding may be binary coding, ternary coding or quaternary coding.

[0009] In an exemplary embodiment of the present invention, the downhole data coding information may further include: packer address information; and the analyzing the communication coding sequence to obtain downhole data coding information includes: splitting the communication coding sequence into a first coding sequence and a second coding sequence; obtaining surface operation instruction information based on the first coding sequence; and obtaining packer address information based on the second coding sequence.

[0010] In an exemplary embodiment of the present invention, the parsing the digital quantity signal to extract the communication coding sequence may include: parsing the digital quantity signal to obtain signal parsing data; identifying whether there is a start coding sequence in the signal parsing data; and extracting the communication coding sequence in the signal parsing data when it is determined that there is a start coding sequence in the signal parsing data.

[0011] In an exemplary embodiment of the present invention, the generating a packer operation instruction based on the downhole data coding information may include: judging whether the current position of the packer matches the packer address information based on the packer address information; and generating a packer operation instruction based on the surface operation instruction information when it is determined that the current position of the packer matches the packer address information.

[0012] In an exemplary embodiment of the present invention, the packer operation instruction may include: starting the motor module of the packer, stopping the motor module of the packer, accelerating the motor module of the packer, and decelerating the motor module of the packer.

[0013] In a second aspect of the present invention, a control device for a water injection packer is provided. The control device includes: a signal acquisition unit, a signal analysis unit, an instruction generation unit, and an instruction sending unit. The signal acquisition unit is configured to acquire digital signals, where the digital signals are obtained by converting pressure pulses inside the tubing. The signal analysis unit is configured to analyze the digital signals to obtain downhole data coding information. The instruction generation unit is configured to generate a packer operation instruction based on the downhole data coding information. The instruction sending unit is configured to send the packer operation instruction to the motor module of the packer.

[0014] In another exemplary embodiment of the present invention, the signal analysis unit may include: an analysis module and an analysis module. The analysis module is configured to analyze the digital signals and extract a communication coding sequence. The communication coding sequence is composed of different types of digital coding pairs arranged in different orders. Different types of digital coding pairs are composed of multiple digital codes arranged in different orders. The analysis module is configured to analyze the communication coding sequence to obtain downhole data coding information. The downhole data coding information at least includes: surface operation instruction information, and the surface operation instruction information includes: performing a setting operation and performing an unseating operation.

[0015] In another exemplary embodiment of the present invention, the analysis module may include: a splitting sub-module, a first information acquisition sub-module, and a second information acquisition sub-module. The splitting sub-module is configured to split the communication coding sequence into a first coding sequence and a second coding sequence. The first information acquisition sub-module is configured to obtain surface operation instruction information based on the first coding sequence. The second information acquisition sub-module is configured to obtain packer address information based on the second coding sequence.

[0016] In another exemplary embodiment of the present invention, the analysis module may include: an analysis data acquisition sub-module, a start coding identification sub-module, and a coding sequence extraction sub-module. The analysis data acquisition sub-module is configured to analyze the digital signals to obtain signal analysis data. The start coding identification sub-module is configured to identify whether there is a start coding sequence in the signal analysis data. The coding sequence extraction sub-module is configured to extract the communication coding sequence in the signal analysis data when it is determined that there is a start coding sequence in the signal analysis data.

[0017] In another exemplary embodiment of the present invention, the instruction generation unit may include: an address judgment module and an instruction generation module. The address judgment module is configured to judge whether the current position of the packer matches the packer address information based on the packer address information. The instruction generation module is configured to generate a packer operation instruction based on the surface operation instruction information when it is determined that the current position of the packer matches the packer address information.

[0018] In the third aspect of the present invention, a control device for a water injection packer is provided. The control device includes a processor and a memory. At least one computer program is stored in the memory, and the at least one computer program is loaded and executed by one or more of the above-mentioned processors, so that the processor executes the control method of the water injection packer as described above.

[0019] In the fourth aspect of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium stores at least one program code, and the program code is loaded and executed by a processor, so that a computer executes the control method of the water injection packer as described above.

[0020] In the fifth aspect of the present invention, a pressure-controlled electric water injection packer is provided. The pressure-controlled electric water injection packer includes: a pressure sensing module, a filter circuit module, a motor drive module, a motor module, and the control device as described above; the pressure sensing module is arranged on the surface of the packer and is used for monitoring the pressure pulse inside the oil pipe and converting the pressure pulse into a voltage signal; the filter circuit module is connected to the pressure sensing module and is used for converting the voltage signal sent by the pressure sensing module into a digital signal; the control device is connected to the filter circuit module and is used for analyzing the digital signal sent by the signal processing module and generating a packer operation instruction; the motor drive module is connected to the control device and is used for receiving the packer operation instruction sent by the control device and generating a motor drive instruction; the motor module is connected to the motor drive module and is used for responding to the motor drive instruction and adjusting the motor operation state.

[0021] In another exemplary embodiment of the present invention, the filter circuit module may include: a filter sub-module and a signal conditioning sub-module; the filter sub-module is used for filtering the voltage signal by using a low-pass active filtering method to obtain a filtered voltage signal; the signal conditioning sub-module is used for conditioning the filtered voltage signal into a digital signal.

[0022] In another exemplary embodiment of the present invention, the motor module may be an oil-immersed brushless motor.

[0023] In another exemplary embodiment of the present invention, the downhole electric packer may further be configured with a battery module.

[0024] In the sixth aspect of the present invention, a packing method is provided. The method is implemented by the pressure-controlled electric water injection packer as described above, and includes: when there is one pressure-controlled electric water injection packer in the wellbore, a pressure pulse is transmitted to the downhole in a manner of pumping pressure at the wellhead position, and ground operation instruction information is transmitted to the downhole by using the pressure pulse as a signal carrier; the pressure-controlled electric water injection packer obtains a packer operation instruction by sensing and analyzing the pressure pulse, and completes setting and releasing according to the packer operation instruction.

[0025] In yet another exemplary embodiment of the present invention, the method may further include: when there are multiple pressure-controlled electric water injection packers in the wellbore, alternately varying composite pressure pulses are transmitted to the downhole by adjusting the pressure applied by the pump truck, and ground operation instruction information and packer address information are transmitted to the downhole with the composite pressure pulses as signal carriers, wherein the composite pressure pulses contain pressure pulse signals of different pressure levels; the pressure-controlled electric water injection packer obtains the packer address and the packer operation instruction by sensing and analyzing the composite pressure pulses, and when it is determined that the current position of the packer meets the packer address, the setting and releasing of the packer are completed according to the packer operation instruction.

[0026] Through the technical solution provided by the present invention, the present invention has at least the following technical effects:

[0027] (1) The control method of the water injection packer provided by the present invention uses pressure pulses as signal carriers, transmits ground operation instructions to the downhole through pressure pulses, and performs setting or releasing operations on the corresponding packers according to the ground operation instructions, thereby completing the intelligent control of the water injection packers and improving the accuracy and reliability of the setting and releasing of the packers;

[0028] (2) The control method of the water injection packer provided by the present invention can effectively solve problems such as long traditional operation time and difficulty in setting or releasing control, and can also greatly improve the operation efficiency, reduce the operation cost and the labor intensity of workers;

[0029] (3) The control device of the water injection packer provided by the present invention can be used in combination with the pressure-controlled electric water injection packer to remotely complete the intelligent control of setting or releasing multiple sets of packers, and the control device is powered by a downhole battery and does not require cable equipment, with low operation cost;

[0030] (4) The pressure-controlled electric water injection packer provided by the present invention can be installed at any position of the tubing string according to actual needs, so that the number of packers can be very conveniently increased, and the control method of the packer is simple and reliable. By giving special pressure pulses, the packer at the corresponding position can be controlled;

[0031] (5) The pressure-controlled electric water injection packer provided by the present invention can be applied to both vertical wells and horizontal wells, with a wide range of applications.

[0032] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation part. Brief Description of the Drawings

[0033] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification. Together with the following specific implementation manners, they are used to explain the embodiments of the present invention, but do not constitute a limitation to the embodiments of the present invention. In the drawings:

[0034] Figure 1 It is a schematic flow chart of the control method for the water injection packer provided by the embodiment of the present invention;

[0035] Figure 2 It is a waveform diagram of the pressure control signal provided by the embodiment of the present invention;

[0036] Figure 3 It is a schematic structural diagram of the control device for the water injection packer provided by the embodiment of the present invention;

[0037] Figure 4 It is a schematic structural diagram of the control equipment for the water injection packer provided by the embodiment of the present invention;

[0038] Figure 5 It is a general design structure diagram of the control circuit for the pressure-controlled electric water injection packer provided by the embodiment of the present invention;

[0039] Figure 6 It is a schematic diagram of the packer string provided by the embodiment of the present invention.

[0040] Description of reference numerals

[0041] 101 - Signal acquisition unit, 102 - Signal analysis unit, 103 - Instruction generation unit, 104 - Instruction sending unit, 201 - Processor, 202 - Memory. Detailed implementation manners

[0042] The following will describe in detail the specific implementation manners of the embodiments of the present invention with reference to the accompanying drawings. It should be understood that the specific implementation manners described here are only used to illustrate and explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention.

[0043] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. In the present invention, "first", "second", etc. are only for convenience of description and easy distinction, and cannot be understood as indicating or implying relative importance.

[0044] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, terms such as "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection; it can be a wired connection, or a wireless connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] In view of the technical problems of long operation time, difficult setting or releasing control existing in conventional packers, the present invention provides a control method for a water injection packer. This method uses pressure pulses as signal carriers, obtains the address information and corresponding operation instruction information of the packer by receiving and analyzing the pressure pulse signal data, and then drives the motor according to the operation instruction to perform setting or releasing operations on the packer at the corresponding position. In this method, there is no need to rely on cable equipment, and the acquisition of control instruction information can be achieved only based on the pressure pulses transmitted from the ground. Compared with the conventional packer control method, it is simple and reliable, with high accuracy and reliability in setting and releasing, and low operation cost. In specific implementation, the above control method can be executed by a control device, which can be a device with processing functions such as a server or a terminal. In addition, this control device can be matched with an electric water injection packer, and only by applying special pressure pulses with a pump truck at the wellhead position, the corresponding packer can be controlled.

[0046] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The following several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0047] As Figure 1 shown, an embodiment of the present invention provides a control method for a water injection packer, and this control method includes the following steps:

[0048] Step S101: Obtain the digital quantity signal obtained by converting the pressure pulse inside the tubing.

[0049] Step S102: Analyze the digital quantity signal to obtain the downhole data coding information.

[0050] Step S103: Generate a packer operation instruction based on the downhole data coding information.

[0051] For example, the packer operation instruction can include: starting the motor module of the packer, stopping the motor module of the packer, accelerating the motor module of the packer, and decelerating the motor module of the packer.

[0052] Step S104: Send the packer operation instruction to the motor module of the packer.

[0053] Further, in a possible implementation manner, in step S102, the process of analyzing the digital quantity signal to obtain the downhole data coding information may include but is not limited to the following sub-steps S1021 to sub-step S1022.

[0054] Sub-step S1021: Analyze the digital quantity signal and extract the communication coding sequence.

[0055] Here, it should be noted that the communication coding sequence is composed of different types of digital coding pairs in different permutation orders, and different types of digital coding pairs are composed of multiple digital codings in different permutation orders. The digital coding can be binary coding, ternary coding or quaternary coding.

[0056] Step S1022: Analyze the communication coding sequence to obtain downhole data coding information.

[0057] Here, it should be noted that the downhole data coding information at least includes: surface operation instruction information, and the surface operation instruction information at least includes: performing a setting operation and performing a releasing operation.

[0058] For example, assume that when a pressure pulse of a higher pressure level is detected inside the tubing, the corresponding voltage signal feature is a high voltage, and when a pressure pulse of a lower pressure level is detected inside the tubing, the corresponding voltage signal feature is a low voltage; then, in the case of selecting binary coding as the digital coding to form the communication coding sequence, it can be stipulated that a high level corresponds to the number 1 and a low level corresponds to the number 0. At this time, different types of digital coding pairs can include four forms: "01", "10", "00" and "11", and different types of communication coding sequences can be formed by arranging and combining the two groups of digital coding pairs "01" and "10", so as to represent different types of surface operation instruction information.

[0059] For example, when the communication coding sequence "0101" is extracted by parsing the digital signal, it can be analyzed that the current downhole data coding information is "performing a setting operation"; when the communication coding sequence "1010" is extracted by parsing the digital signal, it can be analyzed that the current downhole data coding information is "performing a releasing operation"; when the communication coding sequence "1001" is extracted by parsing the digital signal, it can be analyzed that the current downhole data coding information is "performing XX operation"; when the communication coding sequence "0110" is extracted by parsing the digital signal, it can be analyzed that the current downhole data coding information is "performing YY operation".

[0060] Furthermore, in a possible implementation manner, in step S1021, the process of parsing the digital signal and extracting the communication coding sequence may include but is not limited to the following sub-steps S10211 to sub-step S10213.

[0061] Sub-step S10211: Parse the digital signal to obtain signal parsing data.

[0062] Sub-step S10212: Identify whether there is a start coding sequence in the signal parsing data.

[0063] Sub-step S10213: When it is determined that there is a start coding sequence in the signal parsing data, extract the communication coding sequence in the signal parsing data.

[0064] For example, it can be stipulated that the number 1 represents the high level corresponding to the pressure pulse of a higher pressure level, and the number 0 represents the low level corresponding to the pressure pulse of a lower pressure level (as Figure 2 shown). Suppose that within a pulse period, if the pressure pulse signal always shows a high level state, it is represented by the digital code pair "11"; if the pressure pulse signal always shows a low level state, it is represented by the digital code pair "00"; if the pressure pulse signal always shows an alternating high level state and low level state, it is represented by the digital code pair "10"; if the pressure pulse signal always shows an alternating low level state and high level state, it is represented by the digital code pair "01".

[0065] At this time, different types of digital code pairs can include four forms: "01", "10", "00", and "11". By arranging and combining the above four groups of digital code pairs, different types of communication coding sequences can be formed, which are respectively used to represent the start coding information and different types of surface operation instruction information.

[0066] For example, to prevent misoperation, the start coding can be stipulated as: 1 minute of high level + 1 minute of low level, that is, the start coding sequence is stipulated as "1100". When the signal parsing data extracted by parsing the digital quantity signal is "11000101", first analyze and confirm whether the current signal parsing data contains the start coding sequence "1100". When it is determined that the signal parsing data contains the start coding sequence "1100", the signal parsing data after the start coding sequence is determined as the communication coding sequence, that is, the communication coding sequence is "0101", and then by analyzing the communication coding sequence "0101", it is determined that the current downhole data coding information is "perform setting operation".

[0067] When the signal parsing data extracted by parsing the digital quantity signal is "10000101", at this time, the start coding sequence in the signal parsing data is "1000", which does not conform to the representation form of the pre-stipulated start coding sequence. It can be analyzed that the current digital quantity signal is obtained by converting the pressure pulse generated by surface misoperation, and the parsing of the digital quantity signal should be suspended.

[0068] Furthermore, in a possible implementation manner, in addition to the surface operation instruction information, the downhole data coding information may further include: packer address information.

[0069] Further, in a possible implementation, in step S1022, the process of analyzing the communication coding sequence to obtain the downhole data coding information may include, but is not limited to, the following sub-steps S10221 to sub-step S10223.

[0070] Sub-step S10221: Split the communication coding sequence into a first coding sequence and a second coding sequence.

[0071] Sub-step S10222: Based on the first coding sequence, obtain the surface operation instruction information.

[0072] Sub-step S10223: Based on the second coding sequence, obtain the packer address information.

[0073] For example, it can be stipulated that the number 1 represents the high level corresponding to the pressure pulse of a higher pressure level, and the number 0 represents the low level corresponding to the pressure pulse of a lower pressure level. At this time, different types of digital coding pairs can include four forms: "01", "10", "00", and "11". Different types of first coding sequences can be formed by arranging and combining the two groups of digital coding pairs "01" and "10" to represent different types of surface operation instruction information, and different types of second coding sequences can be formed by arranging and combining the above two groups of digital coding pairs to represent different types of packer address information.

[0074] For instance, when the communication coding sequence "01011010" is extracted by parsing the digital quantity signal, first split the communication coding sequence into the first coding sequence "0101" and the second coding sequence "1010". By parsing the first coding sequence "0101", it can be analyzed that the current downhole data coding information is "perform setting operation", and by parsing the second coding sequence "1010", it can be analyzed that the current packer address information is "Packer No. 1". At this time, by combining the downhole data coding information and the packer address information, the downhole data coding information can be determined as "Packer No. 1 performs setting operation".

[0075] When the communication coding sequence "10100101" is extracted by parsing the digital quantity signal, first split the communication coding sequence into the first coding sequence "1010" and the second coding sequence "0101". By parsing the first coding sequence "1010", it can be analyzed that the current downhole data coding information is "perform releasing operation", and by parsing the second coding sequence "0101", it can be analyzed that the current packer address information is "Packer No. 2". At this time, by combining the downhole data coding information and the packer address information, the downhole data coding information can be determined as "Packer No. 2 performs releasing operation".

[0076] Further, in a possible implementation manner, in step S103, the process of generating a packer operation instruction based on the downhole data coding information may include, but is not limited to, the following sub-steps S1031 to S1032.

[0077] Sub-step S1031: Based on the packer address information, determine whether the current position of the packer matches the packer address information.

[0078] Sub-step S1032: When it is determined that the current position of the packer matches the packer address information, generate a packer operation instruction based on the surface operation instruction information.

[0079] In addition, the implementation environment of this embodiment includes at least one terminal and a server, and this method is executed on the terminal or the server respectively. The terminal and the server can be communicatively connected to achieve the interactive transmission of information.

[0080] Among them, the terminal can be any electronic product that can perform human-computer interaction with the user in one or more ways such as a keyboard, a touchpad, a touch screen, and voice interaction, such as a PC (Personal Computer), a PPC (Pocket Personal Computer), a tablet computer, etc.

[0081] The server can be a single server, a server cluster composed of multiple servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN (Content Delivery Network), and big data and artificial intelligence platforms.

[0082] As Figure 3 shown, the embodiment of the present invention further provides a control device for a water injection packer. The control device includes: a signal acquisition unit 101, a signal analysis unit 102, an instruction generation unit 103, and an instruction sending unit 104.

[0083] The signal acquisition unit 101 is used to acquire digital quantity signals, where the digital quantity signals are obtained by converting the pressure pulses inside the tubing.

[0084] The signal analysis unit 102 is connected to the signal acquisition unit 101 and is used to analyze the digital quantity signals to obtain downhole data coding information.

[0085] The instruction generation unit 103 is connected to the signal analysis unit 102 and is used to generate a packer operation instruction based on the downhole data coding information.

[0086] The instruction sending unit 104 is connected to the instruction generating unit 103 and is used to send the packer running instruction to the motor module of the packer.

[0087] Further, in a possible implementation manner, the signal parsing unit 102 may include: a parsing module and an analysis module.

[0088] Among them, the parsing module is used to parse the digital quantity signal and extract the communication coding sequence. Here, the communication coding sequence is composed of different types of digital coding pairs in different arrangement orders, and different types of digital coding pairs are composed of multiple digital codings in different arrangement orders.

[0089] The analysis module is used to analyze the communication coding sequence and obtain the downhole data coding information. Here, the downhole data coding information at least includes: surface operation instruction information; the surface operation instruction information includes: performing a setting operation and performing an unseating operation.

[0090] Further, in a possible implementation manner, the analysis module may include: a splitting sub-module, a first information obtaining sub-module, and a second information obtaining sub-module.

[0091] Among them, the splitting sub-module is used to split the communication coding sequence into a first coding sequence and a second coding sequence.

[0092] The first information obtaining sub-module is used to obtain the surface operation instruction information based on the first coding sequence.

[0093] The second information obtaining sub-module is used to obtain the packer address information based on the second coding sequence.

[0094] Further, in a possible implementation manner, the parsing module may include: a parsing data obtaining sub-module, a starting coding identifying sub-module, and a coding sequence extracting sub-module.

[0095] Among them, the parsing data obtaining sub-module is used to parse the digital quantity signal and obtain the signal parsing data.

[0096] The starting coding identifying sub-module is used to identify whether there is a starting coding sequence in the signal parsing data.

[0097] The coding sequence extracting sub-module is used to extract the communication coding sequence in the signal parsing data when it is determined that there is a starting coding sequence in the signal parsing data.

[0098] Further, in a possible implementation manner, the instruction generating unit 103 may include: an address judging module and an instruction generating module.

[0099] Among them, the address judging module is used to judge whether the current position of the packer matches the packer address information based on the packer address information.

[0100] An instruction generation module, configured to generate a packer operation instruction based on ground operation instruction information when it is determined that the current position of the packer matches the packer address information.

[0101] It should be noted that when the above-provided device realizes its functions, only the division of the above-mentioned functional modules is used for illustration. In actual applications, the above functions can be allocated to different functional modules as needed, that is, the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device provided in the above embodiment and the method provided in the above embodiment belong to the same concept. For the specific implementation process, please refer to the method embodiment and will not be elaborated here.

[0102] As Figure 4 shown, an embodiment of the present invention further provides a control device for a water injection packer. The control device includes a processor 201 and a memory 202. At least one computer program is stored in the memory. The at least one computer program is loaded and executed by one or more of the above-mentioned processors so that the processor implements the control method for the water injection packer as described above.

[0103] Of course, the control device may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input / output. The control device may further include other components for implementing the functions of the device, which will not be elaborated here.

[0104] An embodiment of the present invention further provides a computer-readable storage medium. At least one program code is stored in the computer-readable storage medium. The program code is loaded and executed by a processor so that the computer implements the control method for the water injection packer as described above.

[0105] Optionally, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical disc data storage device, etc. Those skilled in the art can understand that all or part of the steps in implementing the methods of the above embodiments can be completed by a program instructing relevant hardware. The program is stored in a storage medium, including several instructions for causing a single-chip microcomputer, a chip, or a processor to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0106] As Figure 5 shown, an embodiment of the present invention further provides a voltage-controlled electric water injection packer, which may include: a pressure sensing module, a filter circuit module, a motor drive module, a motor module, an MCU control module, and a battery module.

[0107] Specifically, the pressure sensing module is disposed on the surface of the packer for monitoring the pressure pulse inside the tubing and converting the pressure pulse into a voltage signal. The pressure sensing module herein should include a pressure sensor, and the pressure sensor adopted in the embodiment of the present invention has a range of 0 to 40 MPa, which can monitor the pressure value inside the tubing, convert the pressure physical quantity into a voltage signal, and play a role in information acquisition in the packer.

[0108] The filter circuit module is connected to the pressure sensing module for converting the voltage signal sent by the pressure sensing module into a digital signal. Exemplarily, the filter circuit module may include: a filter sub-module and a signal conditioning sub-module. Among them, the filter sub-module is used to filter the voltage signal by using a low-pass active filtering method to obtain a filtered voltage signal. The signal conditioning sub-module is used to condition the filtered voltage signal into a digital signal.

[0109] Since the signals transmitted by the pressure sensor contain clutter signals, these clutter signals will cause great interference to the subsequent data analysis and even lead to misjudgment operations. Therefore, it is necessary to filter out the clutter signals in the signals. Since the clutter in the embodiments of the present invention is high-frequency clutter, a low-pass active filtering method is adopted in the filtering sub-module for filtering. Because the collected signals are analog quantities, while the processor can only process digital quantities, a signal conditioning circuit is also designed in the filtering circuit module to condition the signals into digital quantities.

[0110] The MCU control module is connected to the filtering circuit module and is used to analyze the digital quantity signals sent by the signal processing module and generate packer operation instructions. Here, it should be noted that the MCU control module refers to the control device in the above embodiments, and its function is similar to the CPU of a computer. It is a module used to analyze and process data and issue operation instructions. Since pressure is used as the carrier of information, in this system, it is stipulated that when there is no pressure application, it corresponds to the digital low level 0, and when there is pressure application, it corresponds to the high level 1. To prevent misoperation, the starting code is stipulated as: 1 minute of high level + 1 minute of low level, and then the data information code is added. The data code contains the address information of the packer and the corresponding operation instruction information.

[0111] The motor drive module is connected to the MCU control module and is used to receive the packer operation instructions sent by the MCU control module and generate motor drive instructions. This module serves the motor. Since the motor is a high-power device, a dedicated motor drive module is equipped, so that the motor can be easily controlled, such as starting, stopping, accelerating, decelerating, etc. The motor drive module also has an overload protection function to prevent the motor from burning out when it is blocked.

[0112] The motor module is connected to the motor drive module and is used to adjust the motor operation state in response to the motor drive instructions. The motor module belongs to the execution unit of the electric packer, which converts electrical energy into mechanical energy, and the mechanical rotation serves the setting or releasing operation of the packer. Since the force requirements for setting and releasing the packer are relatively large, the motors used in conventional logging cannot meet the power requirements. Here, a customized 500W oil-immersed brushless motor is adopted. Since the brushless motor has no carbon brush and will not generate spark power generation, it has the advantages of relatively small electromagnetic interference and safe and reliable use.

[0113] The battery module is respectively connected to each power-consuming module in the packer and is used to provide electrical energy. Since the voltage and current requirements for power consumption of each module are different, this module has functions such as voltage conversion, current regulation, overcurrent protection, and undervoltage protection.

[0114] Since this electric packer is powered by a battery and operates by receiving pressure signals, the packer becomes an independent operating unit, and each packer can complete setting or releasing independently. Therefore, the packers can be placed at any position in the tubing string, which can very conveniently increase the number of packers, and the control method is simple and reliable with low operation cost.

[0115] An embodiment of the present invention also provides a method for isolating an injection well. When only one pressure-controlled electric injection packer is installed downhole, the isolation method includes the following steps:

[0116] Step S201: At the wellhead position, use a pump truck to apply pressure to transmit pressure pulses downhole, and use the pressure pulses as a signal carrier to transmit surface operation instruction information downhole.

[0117] Step S202: The pressure-controlled electric injection packer obtains the packer operation instruction by sensing and analyzing the pressure pulses, and completes setting and releasing according to the packer operation instruction.

[0118] When multiple pressure-controlled electric injection packers are installed downhole (as Figure 6 shown), a method for isolating an injection well includes the following steps:

[0119] Step S301: Adjust the way of using a pump truck to apply pressure to transmit alternating composite pressure pulses downhole, and use the composite pressure pulses as a signal carrier to transmit surface operation instruction information and packer address information downhole.

[0120] Here, the composite pressure pulses contain pressure pulse signals of different pressure levels, and the duration of the pressure pulse signals of different levels can be different or the same.

[0121] Step S302: The pressure-controlled electric injection packer obtains the packer address and the packer operation instruction by sensing and analyzing the composite pressure pulses, and when it is determined that the current position of the packer meets the packer address, completes setting and releasing according to the packer operation instruction.

[0122] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0123] In addition, it should be noted that in the various specific technical features described in the above specific embodiments, they can be combined in any appropriate way without contradiction. To avoid unnecessary repetition, the present invention will not separately describe various possible combination methods.

[0124] In addition, any combination can be made among various different embodiments of the present invention, as long as it does not violate the idea of the present invention, and it should equally be regarded as the content disclosed by the present invention.

Claims

1. A control method for a water injection packer, characterized in that, the control method includes: Obtain a digital quantity signal, wherein the digital quantity signal is obtained by converting the pressure pulse inside the tubing; Analyze the digital quantity signal to obtain downhole data coding information; Generate a packer operation instruction based on the downhole data coding information; Send the packer operation instruction to the motor module of the packer.

2. The control method for a water injection packer according to claim 1, characterized in that, the analyzing the digital quantity signal to obtain downhole data coding information includes: Analyze the digital quantity signal to extract a communication coding sequence, the communication coding sequence is composed of different types of digital coding pairs arranged in different orders, and different types of digital coding pairs are composed of multiple digital codings arranged in different orders; Analyze the communication coding sequence to obtain downhole data coding information, the downhole data coding information at least includes: surface operation instruction information, and the surface operation instruction information at least includes: performing a setting operation and performing an unseating operation.

3. The control method for a water injection packer according to claim 2, characterized in that, the digital coding is binary coding, ternary coding or quaternary coding.

4. The control method for a water injection packer according to claim 2, characterized in that, the downhole data coding information further includes: packer address information; the analyzing the communication coding sequence to obtain downhole data coding information includes: Split the communication coding sequence into a first coding sequence and a second coding sequence; Obtain surface operation instruction information based on the first coding sequence; Obtain packer address information based on the second coding sequence.

5. The control method for a water injection packer according to claim 2, characterized in that, the analyzing the digital quantity signal to extract the communication coding sequence includes: Analyze the digital quantity signal to obtain signal analysis data; Identify whether there is a start coding sequence in the signal analysis data; When it is determined that there is a start coding sequence in the signal analysis data, extract the communication coding sequence in the signal analysis data.

6. The control method for a water injection packer according to claim 4, characterized in that, the generating a packer operation instruction based on the downhole data coding information includes: Based on the packer address information, judge whether the current position of the packer matches the packer address information; When it is determined that the current position of the packer matches the packer address information, generate a packer operation instruction based on the surface operation instruction information.

7. The control method for a water injection packer according to claim 6, characterized in that, the packer operation instruction includes: starting the motor module of the packer, stopping the motor module of the packer, accelerating the motor module of the packer, and decelerating the motor module of the packer.

8. A control device for a water injection packer, characterized in that, the control device includes: a signal acquisition unit, a signal analysis unit, an instruction generation unit and an instruction sending unit; The signal acquisition unit is used to obtain a digital quantity signal, wherein the digital quantity signal is obtained by converting the pressure pulse inside the tubing; The signal analysis unit is used to analyze the digital quantity signal to obtain downhole data coding information; An instruction generation unit, configured to generate a packer operation instruction based on downhole data coding information; An instruction sending unit, configured to send the packer operation instruction to the motor module of the packer.

9. The control device for a water injection packer according to claim 8, wherein, the signal analysis unit includes: an analysis module and an analysis module; The analysis module is configured to analyze the digital signal and extract the communication coding sequence. The communication coding sequence is composed of different types of digital coding pairs in different arrangement orders. Different types of digital coding pairs are composed of multiple digital codings in different arrangement orders; The analysis module is configured to analyze the communication coding sequence to obtain downhole data coding information. The downhole data coding information at least includes: surface operation instruction information, and the surface operation instruction information at least includes: performing a setting operation and performing a releasing operation.

10. The control device for a water injection packer according to claim 9, wherein, the analysis module includes: a splitting sub-module, a first information obtaining sub-module, and a second information obtaining sub-module; The splitting sub-module is configured to split the communication coding sequence into a first coding sequence and a second coding sequence; The first information obtaining sub-module is configured to obtain surface operation instruction information based on the first coding sequence; The second information obtaining sub-module is configured to obtain packer address information based on the second coding sequence.

11. The control device for a water injection packer according to claim 9, wherein, the analysis module includes: an analysis data obtaining sub-module, a start coding identification sub-module, and a coding sequence extraction sub-module; The analysis data obtaining sub-module is configured to analyze the digital signal to obtain signal analysis data; The start coding identification sub-module is configured to identify whether there is a start coding sequence in the signal analysis data; The coding sequence extraction sub-module is configured to extract the communication coding sequence in the signal analysis data when it is determined that there is a start coding sequence in the signal analysis data.

12. The control device for a water injection packer according to claim 8, wherein, the instruction generation unit includes: an address judgment module and an instruction generation module; The address judgment module is configured to judge whether the current position of the packer matches the packer address information based on the packer address information; The instruction generation module is configured to generate a packer operation instruction based on the surface operation instruction information when it is determined that the current position of the packer matches the packer address information.

13. A control device for a water injection packer, wherein, the control device includes a processor and a memory. At least one computer program is stored in the memory, and the at least one computer program is loaded and executed by one or more of the above processors, so that the processor executes the control method for the water injection packer according to any one of claims 1 to 7.

14. A computer-readable storage medium, wherein, the computer-readable storage medium stores at least one program code, and the program code is loaded and executed by a processor, so that a computer executes the control method for the water injection packer according to any one of claims 1 to 7.

15. A pressure-controlled electric water injection packer, wherein, The pressure-controlled electric water injection packer includes: a pressure sensing module, a filter circuit module, a motor drive module, a motor module, and the control device described in claim 13; The pressure sensing module is arranged on the surface of the packer and is used for monitoring the pressure pulse inside the oil pipe and converting the pressure pulse into a voltage signal; The filter circuit module is connected to the pressure sensing module and is used for converting the voltage signal sent by the pressure sensing module into a digital signal; The control device is connected to the filter circuit module and is used for analyzing the digital signal sent by the signal processing module and generating a packer operation instruction; The motor drive module is connected to the control device and is used for receiving the packer operation instruction sent by the control device and generating a motor drive instruction; The motor module is connected to the motor drive module and is used for adjusting the motor operation state in response to the motor drive instruction.

16. The pressure-controlled electric water injection packer according to claim 15, wherein, the filter circuit module includes: a filter sub-module and a signal conditioning sub-module; The filter sub-module is used for filtering the voltage signal by using a low-pass active filtering method to obtain a filtered voltage signal; The signal conditioning sub-module is used for conditioning the filtered voltage signal into a digital signal.

17. The pressure-controlled electric water injection packer according to claim 15, wherein, the motor module is an oil-immersed brushless motor.

18. The pressure-controlled electric water injection packer according to claim 15, wherein, the downhole electric packer is further configured with a battery module.

19. A packing method, wherein, the packing method is implemented by the pressure-controlled electric water injection packer described in any one of claims 15 to 18, and includes: When there is one pressure-controlled electric water injection packer in the wellbore, a pump truck is used to apply pressure at the wellhead to transmit a pressure pulse to the downhole, and the ground operation instruction information is transmitted to the downhole with the pressure pulse as the signal carrier; The pressure-controlled electric water injection packer obtains the packer operation instruction by sensing and analyzing the pressure pulse, and completes setting and releasing according to the packer operation instruction.

20. The packing method according to claim 19, wherein, the packing method further includes: When there are multiple pressure-controlled electric water injection packers in the wellbore, an alternating composite pressure pulse is transmitted to the downhole by adjusting the way of pumping by the pump truck, and the ground operation instruction information and the packer address information are transmitted to the downhole with the composite pressure pulse as the signal carrier; wherein, the composite pressure pulse contains pressure pulse signals of different pressure levels; The pressure-controlled electric water injection packer obtains the packer address and the packer operation instruction by sensing and analyzing the composite pressure pulse, and completes setting and releasing according to the packer operation instruction when it is determined that the current position of the packer meets the packer address.

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