Well completion pipe column external low-power-consumption sound wave transmission device and system

Abstract

The invention discloses an external low-power-consumption sound wave transmission device and system for a well completion pipe string, and belongs to the technical field of well completion information transmission. The external low-power-consumption sound wave transmission device comprises a power supply short section, one end of the power supply short section is provided with an end sealing head for sealing, the other end of the power supply short section is connected with a circuit short section, and the other end of the circuit short section is connected with a transmitting short section; the other end of the emission short section is connected with the collection short section, and the other end of the collection short section is provided with an end sealing head for sealing; a sound wave transmitting transducer is arranged in the transmitting short section and is used for generating sound wave signals with different vibration frequencies and transmitting modulated sound wave information to the outside; and a control circuit board is arranged in the circuit nipple and is used for controlling the sound wave transmitting transducer to work, power conversion and signal processing. The sound wave transmission device and system provided by the invention have the advantages of adjustable sound wave emission frequency, low power consumption, convenience in installation, convenience in well site operation and the like, are high in reliability and simple in control mode, and can realize long-time underground sound wave information transmission work.

Description

Technical Field

[0001] The present invention relates to the technical field of well completion information transmission, and in particular to a well completion string external low-power consumption acoustic wave transmission device and system. Background Art

[0002] With the continuous deepening of oil and gas field exploration and development, oil and gas production needs to gradually enter the era of refinement, informatization and automation. In the process of well completion, it is necessary to accurately and real-time grasp the various changes in the well in order to timely and accurately judge the working conditions. How to transmit the collected information to the ground and how to transmit the ground control instructions to the downhole tools have always been highly valued issues in the field of oil and gas well production and control.

[0003] The transmission methods of underground information are generally divided into two categories: wired transmission and wireless transmission. Since the underground transmission distance is thousands of meters and is affected by the installation of downhole tools, wired transmission is limited. Currently, wireless transmission methods are mostly used, including drilling fluid pulses, electromagnetic waves and sound waves. Sound wave transmission uses the pipe string as a transmission channel, is not easily affected by formation characteristics, has low development costs, is relatively simple to implement, and is convenient for well site operations.

[0004] However, current downhole acoustic wave transmission is easily affected by the channel characteristics of the tubing and the attenuation of the acoustic wave transmission along the tubing. In addition, the downhole acoustic wave transmission device needs to overcome the high temperature and high pressure environment underground, and the power supply problem of the device needs to be solved. The acoustic wave transmission device directly connected to the casing in the prior art has the problems of inconvenient installation, large structural size, and difficulty in powering the device. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a low-power acoustic wave transmission device and system externally mounted on a completion string, which has the advantages of adjustable acoustic wave emission frequency, low power consumption, easy installation, and convenient well site operation, and has high reliability and simple control method, and can realize long-term underground acoustic wave information transmission.

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect of the present invention, a low-power acoustic wave transmission device external to a completion string is provided, comprising a power supply nipple, one end of the power supply nipple is provided with an end sealing head for sealing, the other end of the power supply nipple is connected to a circuit nipple, the other end of the circuit nipple is connected to a transmitting nipple, the other end of the transmitting nipple is connected to a collection nipple, and the other end of the collection nipple is provided with an end sealing head for sealing;

[0008] The transmitting short section is provided with a sound wave transmitting transducer inside for generating sound wave signals of different vibration frequencies and transmitting modulated sound wave information outward; the circuit short section is provided with a control circuit board inside for controlling the operation, power conversion and signal processing of the sound wave transmitting transducer.

[0009] In some embodiments of the present invention, the power supply short section and the circuit short section are connected via a first double male connector; the circuit short section and the transmitting short section are connected via an acoustic wave transmitting transducer base; and the transmitting short section and the collecting short section are connected via a second double male connector.

[0010] In some embodiments of the present invention, the power supply short section includes a battery outer tube, a battery sleeve and a battery plug are provided inside the battery outer tube, a battery string formed by connecting industrial batteries in series is placed inside the battery sleeve, both ends of the battery string are fixed with battery plugs, and a through hole is provided on the battery plug for connecting the power supply line.

[0011] In some embodiments of the present invention, the circuit sub comprises a circuit outer cylinder, and a circuit mounting frame for mounting a control circuit board is axially disposed inside the circuit outer cylinder.

[0012] In some embodiments of the present invention, the circuit installation frame has a boss at one end close to the transmitting short section for positioning and installing with the acoustic wave transmitting transducer base, and a sealing ring is provided at one end away from the transmitting short section for annular fixation.

[0013] In some embodiments of the present invention, the transmitting short section includes a transmitting outer tube, and an acoustic wave transmitting transducer base is provided at one end of the transmitting outer tube close to the circuit short section, and the acoustic wave transmitting transducer is installed on the acoustic wave transmitting transducer base; a positioning groove is provided at one end of the acoustic wave transmitting transducer base close to the circuit short section for positioning and installing with the boss of the circuit mounting frame.

[0014] In some embodiments of the present invention, the acoustic wave emitting transducer adopts a sandwich structure, a pre-tightening bolt is provided on the base of the acoustic wave emitting transducer, and a vibrator, a piezoelectric ceramic stack and a gasket are sequentially inserted between the pre-tightening bolt and the base of the acoustic wave emitting transducer; a stepped structure is provided on the vibrator, and the stepped structure is matched with the nut end of the pre-tightening bolt, and the pre-tightening bolt and the vibrator cooperate to apply a pre-tightening force to the piezoelectric ceramic stack.

[0015] In some embodiments of the present invention, the collection pup joint includes a collection outer cylinder and a sensor disposed inside the collection outer cylinder, and the sensor includes a pressure sensor, a temperature sensor, and an acoustic wave signal receiving sensor.

[0016] In a second aspect of the present invention, a completion string acoustic wave transmission system is provided, comprising a plurality of the above-mentioned acoustic wave transmission devices.

[0017] In some embodiments of the present invention, it also includes a ground receiving device, a downhole information collection sensor and a ground display device that are communicatively connected to each other;

[0018] The multiple acoustic wave transmission devices are installed on the outer wall of the oil pipe at a certain distance along the length direction of the oil pipe, the ground receiving device is installed on the wellhead, and the downhole information collection sensor is arranged at the bottom end of the oil pipe for collecting downhole information;

[0019] The acoustic wave transmission device receives the downhole information collected by the downhole information collection sensor, encodes it, and transmits it in sequence along the oil pipe through the acoustic wave vibration signal. The ground receiving device receives the acoustic wave vibration signal transmitted by the acoustic wave transmission device, decodes it and sends it to the ground display device. The ground display device displays the downhole data information after signal processing.

[0020] One or more technical solutions of the present invention have the following beneficial effects:

[0021] The low-power acoustic wave transmission device provided by the present invention has a small radial size and can be installed on the outside of the oil pipe wall without occupying the internal channel of the oil pipe, which is convenient for installation at the well site.

[0022] The present invention changes the working frequency of the internal acoustic wave transmitting transducer by controlling the circuit board to match the frequency characteristics of the pipe string and increase the transmission distance of the acoustic wave; reduces the resonance frequency of the acoustic wave transmitting transducer by stacking piezoelectric ceramics, and adopts a multi-section industrial battery series connection method to solve the long-term power supply demand of the device in the well and reduce the number of tripping and lowering of the oil pipe;

[0023] The present invention converts a low-voltage power supply into a high-voltage power supply through a resonant circuit, and supplies power to the acoustic wave transmitting transducer, thereby reducing the power consumption of the device and increasing the underground working time of the device.

[0024] The present invention can receive the acoustic wave signal transmitted from the lower part and transmit the acoustic wave signal upward, and can realize the long-distance transmission of the acoustic wave information in the well by adopting a plurality of transmission devices as repeaters. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of a low-power acoustic wave transmission device externally mounted on a completion string provided in Example 1 of the present invention;

[0026] Figure 2 It is a partial structural cross-sectional view of a low-power acoustic wave transmission device externally mounted on a completion string provided in Example 1 of the present invention;

[0027] Figure 3is a schematic diagram of the structure of the acoustic wave transmitting transducer provided in Example 1 of the present invention;

[0028] Figure 4 is a schematic diagram of the structure of a battery sleeve provided in Example 1 of the present invention;

[0029] Figure 5 Schematic diagram of the well completion string acoustic wave transmission system provided in Example 1 of the present invention;

[0030] Figure 6 This is a schematic diagram of the low power consumption implementation principle of the sound wave transmission device provided in Example 1 of the present invention.

[0031] In the figure: 1. end sealing head; 2. power supply short section; 3. first double male connector; 4. circuit short section; 5. transducer base; 6. transmitting short section; 7. second double male connector; 8. collection short section; 9. battery plug; 10. battery outer tube; 11. battery sleeve; 12. circuit outer tube; 13. circuit mounting frame; 14. transmitting outer tube; 15. acoustic wave transmitting transducer; 16. pre-tightening bolt; 17. vibrator; 18. piezoelectric ceramic stack; 19. gasket; 20. ground receiving device; 21. wellhead; 22. casing; 23. oil pipe; 24. acoustic wave transmission device; 25. downhole information collection sensor; 26. ground display equipment. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] It can be understood that the short section mentioned in the present invention is a casing short section, wherein the power supply short section is arranged in the casing short section with a power supply for powering the entire device, the circuit short section is arranged in the casing short section with relevant circuits and a control circuit board for operation control of the entire device, the transmitting short section is arranged in the casing short section with an acoustic wave transmitting transducer for transmitting acoustic waves, and the collecting short section is arranged in the casing short section with a pressure sensor, a temperature sensor and an acoustic wave signal receiving sensor for information collection and transmission.

[0034] Example 1

[0035] In a typical embodiment of the present invention, a low-power acoustic wave transmission device external to a completion string is provided, comprising a power supply subsection 2, one end of which is provided with an end sealing head 1 for sealing, the other end of the power supply subsection 2 is connected to a circuit subsection 4, the other end of the circuit subsection 4 is connected to a transmitting subsection 6, the other end of the transmitting subsection 6 is connected to a collection subsection 8, and the other end of the collection subsection 8 is provided with an end sealing head 1 for sealing;

[0036] An acoustic wave transmitting transducer 15 is provided inside the transmitting short section 6 for generating acoustic wave signals of different vibration frequencies and transmitting modulated acoustic wave information to the outside; a control circuit board is provided inside the circuit short section 4 for controlling the operation of the acoustic wave transmitting transducer 15, power conversion and signal processing.

[0037] In this embodiment, if Figure 1 As shown, the power supply sub 2 and the circuit sub 4 are threadedly connected through the first double male connector 3, the transmitting sub 6 and the circuit sub 4 are threadedly connected through the acoustic wave transmitting transducer base 5, and the collection sub 8 and the transmitting sub 6 are threadedly connected through the second double male connector 7. The two ends of the completion string external low-power acoustic wave transmission device are sealed using end sealing heads 1.

[0038] In this embodiment, two end sealing heads 1 are used for sealing at both ends of the device, and the ends thereof adopt a hexahedral structure for easy twisting.

[0039] Furthermore, the power supply short section 2 and the circuit short section 4 are connected via a first double male connector 3; the circuit short section 4 and the transmitting short section 6 are connected via an acoustic wave transmitting transducer base 5; and the transmitting short section 6 and the collecting short section 8 are connected via a second double male connector 7.

[0040] In this embodiment, the first double male connector 3 and the second double male connector 7 have the same structure. The two double male connectors have circular holes inside for internal line connection and sealing grooves outside for strict sealing of the device to prevent liquid from entering the device. The middle parts of the two double male connectors adopt a hexahedral structure to facilitate screwing into the short section.

[0041] Furthermore, the power supply short section 2 includes a battery outer tube 10, and a battery sleeve 11 and a battery plug 9 are arranged inside the battery outer tube 10. A battery string composed of industrial batteries connected in series is placed inside the battery sleeve 11, and both ends of the battery string are fixed with battery plugs 9. A through hole is provided on the battery plug 9 for connecting the power supply line.

[0042] In this embodiment, if Figure 2 As shown, the battery sleeve 11 is placed inside the battery outer tube 10, the power supply battery is placed inside the battery sleeve 11, and the battery plugs 9 are inserted at both ends to fix the power supply battery. The circuit installation skeleton 13 is placed inside the circuit outer tube 12, the lower end of the circuit installation skeleton 13 is fixedly connected to the transducer base 5 by screws, and the upper end of the circuit installation skeleton 13 is circumferentially fixed by a sealing ring. The acoustic wave transmitting transducer 15 is installed on the transducer base 5 and is located inside the transmitting outer tube 14.

[0043] like Figure 4 As shown, a slot is provided in the axial direction of the battery sleeve 11 for connecting the internal battery circuit. Battery plugs 9 are placed at both ends of the battery sleeve 11 for fixing.

[0044] Furthermore, the circuit short section 4 includes a circuit outer cylinder 12 , and a circuit mounting frame 13 for mounting a control circuit board is axially arranged inside the circuit outer cylinder 12 .

[0045] Furthermore, a boss is provided at one end of the circuit installation frame 13 close to the transmitting short section 6 for positioning and installing with the acoustic wave transmitting transducer base 5, and a sealing ring is provided at one end of the circuit installation frame 13 away from the transmitting short section 6 for annular fixation.

[0046] In this embodiment, the end surface of the circuit mounting frame 13 is provided with a boss for positioning the circuit mounting frame 13 and the acoustic wave transmitting transducer base 5; the other end is provided with a through hole for circuit line connection. The circuit mounting frame 13 is designed with two upper and lower planes for mounting the control circuit board.

[0047] Furthermore, the transmitting short section 6 includes a transmitting outer tube 14, and an acoustic wave transmitting transducer base 5 is provided at one end of the transmitting outer tube 14 close to the circuit short section 4, and the acoustic wave transmitting transducer 15 is installed on the acoustic wave transmitting transducer base 5; a positioning groove is provided at one end of the acoustic wave transmitting transducer base 5 close to the circuit short section 4 for positioning and installing with the boss of the circuit mounting frame 13.

[0048] The acoustic wave transmitting transducer base 5 is provided with a sealing groove on the outside, and a hexahedral structure is adopted in the middle. One end surface of the acoustic wave transmitting transducer base 5 is provided with a circumferential threaded hole and a middle positioning hole for installing the circuit mounting frame 13; the center of the other end surface is provided with a threaded hole for connecting the pre-tightening bolt 16. The acoustic wave transmitting transducer base 5 is provided with a through hole for connecting the circuit.

[0049] Furthermore, the acoustic wave transmitting transducer 15 adopts a sandwich structure, and a pre-tightening bolt 16 is provided on the acoustic wave transmitting transducer base 5, and a vibrator 17, a piezoelectric ceramic stack 18 and a gasket 19 are sequentially inserted between the pre-tightening bolt 16 and the acoustic wave transmitting transducer base 5; a stepped structure is provided on the vibrator 17, and the stepped structure is matched with the nut end of the pre-tightening bolt 16, and the pre-tightening bolt 16 and the vibrator 17 cooperate to apply a pre-tightening force to the piezoelectric ceramic stack 18.

[0050] In this embodiment, the structure of the acoustic wave transmitting transducer 15 in the transmitting short section 6 is a sandwich type, and the piezoelectric ceramic stack 18 and the vibrator 17 are pressed together by the pre-tightening bolt 16, and a certain pre-tightening force is applied. The vibrator 17 can reduce the resonant frequency of the acoustic wave transmitting transducer 15, achieve impedance matching with the piezoelectric ceramic stack 18, and improve the quality of acoustic wave transmission.

[0051] In addition, the piezoelectric ceramic stack 18 in the transmitting short section 6 is formed by stacking multiple piezoelectric ceramics and adding a copper sheet between adjacent ceramic sheets. The number of ceramic sheets in the piezoelectric ceramic stack 18 can be selected according to the acoustic wave transmitting frequency of the device.

[0052] Furthermore, the collection subsection 8 includes a collection outer tube and sensors arranged inside the collection outer tube, wherein the sensors include a pressure sensor, a temperature sensor and an acoustic wave signal receiving sensor.

[0053] like Figure 3 As shown, the vibrator 17, the piezoelectric ceramic stack 18 and the gasket 19 are sequentially mounted on the pre-tightening bolt 16, and the pre-tightening bolt 16 is screwed into the transducer base 5 for fixing. The pre-tightening bolt 16 cooperates with the stepped surface of the vibrator 17 to apply a pre-tightening force to the piezoelectric ceramic stack 18.

[0054] In a second aspect of the present invention, a completion string acoustic wave transmission system is provided, comprising a plurality of the acoustic wave transmission devices 24 described above.

[0055] Furthermore, it also includes a ground receiving device 20, a downhole information collection sensor 25 and a ground display device 26 which are communicatively connected to each other;

[0056] A plurality of acoustic wave transmission devices 24 are installed on the outer wall of the oil pipe 23 along the length direction of the oil pipe 23 at a certain distance, a ground receiving device 20 is installed on the wellhead 21, and a downhole information collection sensor 25 is arranged at the bottom end of the oil pipe 23 for collecting downhole information;

[0057] The acoustic wave transmission device 24 receives the downhole information collected by the downhole information collection sensor 25, encodes it, and transmits it in sequence along the oil pipe 23 through the acoustic wave vibration signal. The ground receiving device 20 receives the acoustic wave vibration signal transmitted by the acoustic wave transmission device 24, decodes it and sends it to the ground display device 26. The ground display device 26 displays the downhole data information after signal processing.

[0058] like Figure 5 As shown, the oil pipe 23 is set in the casing 22, the acoustic wave transmission device 24 is installed on the outer wall of the oil pipe 23 at a certain distance, and the ground receiving device 20 is installed on the wellhead 21. The downhole information acquisition sensor 25 is located at the lower part of the oil pipe 23 to collect downhole temperature, oil and gas pressure and other information. The acoustic wave transmission device 24 encodes the downhole information and transmits it upward along the oil pipe 23 through acoustic wave vibration; the acoustic wave transmission device receives the vibration signal transmitted from the lower part and continues to transmit it upward. The ground receiving device 20 receives the acoustic wave vibration signal transmitted from the lower part, decodes it and sends it to the ground display device 26, and the ground display device 26 displays the downhole data information after signal processing.

[0059] like Figure 6As shown, it is a low-power implementation principle diagram of the acoustic wave transmission device in the present invention, in which a low-voltage square wave signal is converted into a high-voltage sinusoidal signal through an RLC resonant circuit; the downhole acquisition data signal is loaded onto the high-voltage sinusoidal signal through a combination code modulation circuit, and the high-voltage sinusoidal signal supplies power to the acoustic wave transmitting transducer 15, thereby generating a sinusoidal vibration signal.

[0060] The external low-power acoustic wave transmission device for the completion string provided by the present invention has a small radial size and can be installed on the outside of the oil pipe wall without occupying the internal channel of the oil pipe, which is convenient for installation at the well site; at the same time, the external low-power acoustic wave transmission device for the completion string is powered by industrial batteries in series, which solves the long-term power supply demand of the device underground and reduces the number of times the oil pipe is raised and lowered; and the operating frequency of the internal acoustic wave transmitting transducer is changed by controlling the circuit board to match the frequency characteristics of the pipe string and increase the transmission distance of the acoustic wave; in addition, the present invention converts a low-voltage power supply into a high-voltage power supply through a resonant circuit and supplies power to the acoustic wave transmitting transducer, thereby reducing the power consumption of the device.

[0061] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A low-power acoustic wave transmission device external to a completion string, characterized in that: It comprises a power supply short section, one end of which is provided with an end sealing head for sealing, the other end of which is connected to a circuit short section, the other end of which is connected to a launch short section, the other end of which is connected to a collection short section, and the other end of which is provided with an end sealing head for sealing; The transmitting short section is provided with a sound wave transmitting transducer inside for generating sound wave signals of different vibration frequencies and transmitting modulated sound wave information outward; the circuit short section is provided with a control circuit board inside for controlling the operation, power conversion and signal processing of the sound wave transmitting transducer.

2. The low-power acoustic wave transmission device external to the completion string according to claim 1, characterized in that: The power supply short section is connected to the circuit short section via a first double male connector; the circuit short section is connected to the transmitting short section via an acoustic wave transmitting transducer base; and the transmitting short section is connected to the collecting short section via a second double male connector.

3. The low-power acoustic wave transmission device external to the completion string according to claim 1, characterized in that: The power supply short section includes a battery outer tube, a battery sleeve and a battery plug are arranged inside the battery outer tube, a battery string formed by industrial batteries connected in series is placed inside the battery sleeve, both ends of the battery string are fixed with battery plugs, and a through hole is arranged on the battery plug for connecting the power supply line.

4. The low-power acoustic wave transmission device external to the completion string according to claim 1, characterized in that: The circuit short section comprises a circuit outer cylinder, and a circuit mounting frame for mounting a control circuit board is axially arranged inside the circuit outer cylinder.

5. The low-power acoustic wave transmission device external to the completion string according to claim 4, characterized in that: The circuit installation frame has a boss at one end close to the transmitting short section for positioning and installing with the acoustic wave transmitting transducer base, and a sealing ring at one end away from the transmitting short section for annular fixing.

6. The low-power acoustic wave transmission device external to the completion string according to claim 5, characterized in that: The transmitting short section includes a transmitting outer tube, and an acoustic wave transmitting transducer base is provided at one end of the transmitting outer tube close to the circuit short section, and the acoustic wave transmitting transducer is installed on the acoustic wave transmitting transducer base; a positioning groove is provided at one end of the acoustic wave transmitting transducer base close to the circuit short section for positioning and installing with the boss of the circuit mounting frame.

7. The low-power acoustic wave transmission device external to the completion string according to claim 1, characterized in that: The acoustic wave transmitting transducer adopts a sandwich structure, a pre-tightening bolt is provided on the base of the acoustic wave transmitting transducer, and a vibrator, a piezoelectric ceramic stack and a gasket are sequentially passed through the pre-tightening bolt and the base of the acoustic wave transmitting transducer; a stepped structure is provided on the vibrator, and the stepped structure is matched with the nut end of the pre-tightening bolt, and the pre-tightening bolt and the vibrator cooperate to apply a pre-tightening force to the piezoelectric ceramic stack.

8. The low-power acoustic wave transmission device external to the completion string according to claim 1, characterized in that: The collection short section includes a collection outer tube and a sensor arranged inside the collection outer tube, and the sensor includes a pressure sensor, a temperature sensor and an acoustic wave signal receiving sensor.

9. A completion string acoustic wave transmission system, characterized in that: It comprises a plurality of sound wave transmission devices according to any one of claims 1 to 8.

10. A completion string acoustic wave transmission system according to claim 9, characterized in that: It also includes a ground receiving device, a downhole information collection sensor and a ground display device that are communicatively connected to each other; The multiple acoustic wave transmission devices are installed on the outer wall of the oil pipe at a certain distance along the length direction of the oil pipe, the ground receiving device is installed on the wellhead, and the downhole information collection sensor is arranged at the bottom end of the oil pipe for collecting downhole information; The acoustic wave transmission device receives the downhole information collected by the downhole information collection sensor, encodes it, and transmits it in sequence along the oil pipe through the acoustic wave vibration signal. The ground receiving device receives the acoustic wave vibration signal transmitted by the acoustic wave transmission device, decodes it and sends it to the ground display device. The ground display device displays the downhole data information after signal processing.

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