CN111441760A - A cast-and-fishing underground wireless transmission system, wireless charging device and method - Google Patents

Abstract

The invention discloses a casting and fishing type underground wireless transmission system, wireless charging equipment and method. The system comprises: a casting and fishing type downhole measuring device, which is used for measuring the temperature, pressure, flow rate and water content in a deep well oil pipe and converting them into electrical signals. ; ground monitoring device, located on the surface, for receiving and processing electrical signals; automatic setting device, which is located on the periphery of the casting and fishing type downhole measuring device, used to fix the casting and fishing type downhole measuring device at the set position, when receiving After taking out the signal, it can automatically return to the setting state; the pre-embedded antenna is located on the periphery of the casing, and when a signal transmission loop is formed, the electrical signal is transmitted to obtain the parameters of the downhole fluid; when the fishing-type downhole measurement device is wirelessly charged , which is used to transmit wireless charging signals. The invention uses the transformer coil to improve the environmental impedance in the environment of extremely low impedance underground, and realizes the transmission of electrical signals.

Description

A cast-and-fishing underground wireless transmission system, wireless charging device and method

technical field

The invention belongs to the technical field of downhole measurement, and more particularly, relates to a cast-and-fishing underground wireless transmission system, wireless charging equipment and method.

Background technique

At present, most of the in-well measuring instruments after the completion and use of deep wells are installed below the packer and fixed outside the oil pipe or intermediate pipe. This traditional down-hole measuring device cannot be repaired in time, and the operating cost is high and the special application is too high. . At the same time, the existing deep well monitoring technologies usually provide long-term power supply and signal transmission channels to the downhole monitoring system through cables extending from the ground, so as to achieve permanent power supply and monitoring. In the case of deep well measurement devices installed at depths of several kilometers downhole, the use of cables is not only expensive but also time consuming to install. Also, whether the tubing string or the annular permanent packer between the tubing and the intermediate tubing string is isolated, it is difficult for the cable to extend through the tubing or tubing to the downhole monitoring device. Therefore the use of cables is not advisable.

Secondly, under the prior art, all the in-well measuring instruments after the construction and use of the salt-cavern gas storage are installed below the packer and fixed outside the oil pipe or intermediate pipe. It is hoped that monitoring can be performed by wireless transmission. The in-well measuring instruments are powered by batteries. The monitoring time is about 18 months, which is not only not conducive to the accuracy of monitoring, but also greatly increases the cost of maintenance operations. At the same time, wireless transmission in deep wells is difficult, and the underground transmission signal is weak and cannot support full-distance transmission. The Chinese patent application "A wireless transmission method for downhole full well" (application number: 201811565293.2, application date: 2018.12.20) mentions a method for downhole signal transmission using repeaters, which greatly improves the use of repeaters. The signal transmission distance is reduced, but when monitoring the parameters of the fluid in the tubing in the casing, the impedance of the circuit corresponding to the output electrical signal of the measuring instrument is grounded, and the signal transmission cannot be achieved by only using the repeater. In addition, the Chinese patent application "A Downhole Electromagnetic Wireless Communication System and Method" (application number: 201810445619.1, application date: 2018.5.11) mentions a method for underground signal transmission, because electromagnetic wireless transmission does not require impedance media. The transmission characteristics are different, and there are both low-impedance (casing part) and high-impedance (in-cavity central pipe part) environments in deep wells, so this method cannot be applied to deep well signal transmission in salt cavern gas storage.

SUMMARY OF THE INVENTION

In view of the defects and improvement needs of the prior art, the present invention provides a casting and fishing type underground wireless transmission system, wireless charging equipment and method, which aims to solve the casting and fishing function of the downhole measurement device, corresponding to the signal in the extremely low impedance environment Transmission function and wireless charging of downhole measurement devices.

In order to achieve the above object, according to the first aspect of the present invention, aiming at the structure in which the casing is sleeved with an oil pipe in the deep well measurement, a throwing and fishing type downhole wireless transmission system is provided, and the system includes:

Fishing type downhole measuring device, used for measuring the temperature, pressure, flow rate and water content in the tubing during deep well surveying, and converting it into electrical signals for transmission;

ground surveillance devices, located on the surface of the earth, for receiving and processing said electrical signals;

The automatic setting device is located at the periphery of the casting and fishing type downhole measuring device, and is used to fix the casting and fishing type downhole measuring device on the inner wall of the tubing;

The pre-embedded antenna is located on the periphery of the casing. When a signal transmission loop is formed, the electrical signal is transmitted to obtain the parameters of the downhole fluid; it is used to transmit the wireless charging signal when the fishing-type downhole measurement device performs wireless charging.

Preferably, the automatic setting device fixes the casting and fishing downhole measuring device at a set position when receiving the fixing signal, and automatically returns to the setting state after receiving the withdrawing signal.

Preferably, a transformer coil is installed on the outer wall of the tubing at the location of the drop-in downhole measurement device, which is used to transform the impedance of the corresponding position of the drop-in downhole measurement device, so as to improve the extremely low impedance of the corresponding position of the drop-in downhole measurement device. In the environment, the oil pipe is used as the transmission path and the transformer coil, bushing, and the ground form a transmission loop to transmit electrical signals. The extremely low impedance environment is due to the fact that the actual axial length of the fishing-type downhole measurement device is 3m to 5m. At the same time, the device is located in the tubing inside the casing, and the total circuit impedance of the current common tubing installation device is 1000 smaller. ~10000 times.

Preferably, the ratio k of the gates of the primary coil and the secondary coil on the transformer coil is greater than 100, which is used to increase the impedance to twice the original value of ^k .

Preferably, the impedance transformation effect of the transformer coil is effective in both receiving electrical signals and wireless charging.

Preferably, the pre-embedded antenna is fixed and installed on the outer casing of the casing at a distance of about 100 m from the ground when the pipeline is lowered into the well.

The invention aims at that when the casting and fishing underground wireless transmission system needs to be charged, the embedded antenna inputs the wireless charging signal, and the ground power supply device transmits the power to the embedded antenna through the power amplifier to provide power.

In order to achieve the above object, according to the second aspect of the present invention, there is provided a method for a throwing and fishing type downhole measurement device, the method comprising:

S1. Lower the casting and fishing type downhole measuring device into the tubing through the casting and fishing device, trigger the automatic setting device at the set position, fix the casting and fishing type downhole measuring device, and take out the casting and fishing device;

S2. When it is necessary to overhaul the cast-and-fish downhole measuring device, run the cast-and-fishing device and connect it to the cast-and-fish downhole measuring device, trigger the automatic cancellation of the setting device, release the cast-and-fish downhole measuring device, and take out the cast-and-fish underground measuring device. measuring device.

In order to achieve the above object, according to the third aspect of the present invention, there is provided a fishing-type underground wireless transmission method, the method comprising:

Convert the temperature, pressure, flow and other data in the tubing measured by the fishing-type downhole measuring device into electrical signals, and use the tubing as a transmission path to transmit the electrical signals;

In order to achieve the above object, according to the fourth aspect of the present invention, there is provided a method for wireless charging of a throw-and-fish type downhole measurement device, the method comprising:

When it is detected that the power of the downhole measuring device is insufficient, the ground power supply device is activated, and a high-power signal is transmitted to the embedded antenna through the power amplifier, so as to realize the wireless charging of the downhole measuring device.

In general, through the above technical solutions conceived by the present invention, the following beneficial effects can be achieved:

(1) For wireless transmission, the casting and fishing type downhole measurement device in the tubing needs to transmit signals from a very low impedance environment, which makes wireless transmission extremely difficult. The present invention uses a transformer coil to improve the environmental impedance in an extremely low impedance environment underground , to realize the transmission of electrical signals.

(2) For the power supply system of the cast-and-fetch type downhole measuring device, the method of pre-embedding the coil is adopted, and the power supply to the cast-and-fish type downhole measuring device is realized by means of wireless charging.

(3) For the downhole measurement device, the use of the cast and fish type downhole measurement device can greatly reduce the cost of replacement and maintenance of the measurement device.

Description of drawings

FIG. 1 is a schematic structural diagram of a fishing-type underground wireless transmission system provided by an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a throwing-and-fishing wireless measurement device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a pre-embedded antenna provided by an embodiment of the present invention;

4 is a schematic structural diagram of a transformer coil provided by an embodiment of the present invention;

Throughout the drawings, the same reference numbers are used to refer to the same elements or structures, wherein:

1. Casting and fishing type downhole measuring device; 2. Automatic setting device; 3. Transformer coil; 4. Pre-embedded coil insulation layer; 5. Pre-embedded coil; 6. Oil pipe; 7. Casing; 8. Power amplifier; 9 , ground monitoring device; 10, ground power supply device; 11, surface.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

As shown in FIG. 1 , the present invention provides a casting and fishing type downhole wireless transmission system, the system includes: a throwing and fishing type downhole measurement device, which is installed on the inner wall of the tubing in the casing during the deep well measurement operation, and is used for measuring the deep well tubing. The temperature, pressure, flow and other data are converted into electrical signals, and the electrical signals are transmitted through the tubing as a transmission path; the pre-embedded antenna, located on the periphery of the tubing, transmits electrical signals to obtain downhole fluid parameters; automatic setting device, It is located on the periphery of the cast and fish type downhole measuring device, and is used to fix the cast and fish type downhole measuring device at the set position, and can automatically return to the setting state after receiving the take-out signal. A transformer coil is installed on the outer wall of the tubing at the location of the drop-in downhole measurement device, which is used to transform the impedance of the corresponding position of the drop-in downhole measurement device. The tubing is used as the transmission path and the transformer coil, casing, and ground form a transmission loop for transmission. electric signal. The ratio k of the primary coil and the secondary coil on the transformer coil is greater than 100, which is used to increase the impedance to ² times the original value.

The present invention also provides a wireless charging device for the cast-and-fish underground wireless transmission system. When the cast-and-fish underground wireless transmission system needs to be charged, the pre-embedded antenna inputs the wireless charging signal. The ground power supply device transmits power to the embedded antenna through the power amplifier.

As shown in Fig. 2, the throwing and fishing wireless measuring device is fixed at a fixed position on the inner wall of the oil pipe. When the throwing operation is performed, the throwing and fishing wireless measuring device is cast and fished along the inner wall 6 of the oil pipe. When the position is fixed, the automatic setting device 12 is automatically opened, and the launching work is completed; when the salvage work is performed, the casting and fishing wireless measuring device receives a signal, the automatic setting device 12 is automatically retracted, and the salvaging device fishes the wireless measuring device out of the tubing. , the salvage work is completed.

As shown in FIG. 3 , the embedded antenna 5 is fixed on the outer wall of the casing 7, which is mainly connected with the power amplifier 8 on the ground. After processing the signal, it is connected with the ground detection device 9 and the ground power supply device 10, so as to realize the bidirectional connection between the signal and the power. transmission.

As shown in Figure 4, the transformer coil 3 is fixed on the outer wall of the oil pipe 6, and its main function is to perform impedance transformation, so as to realize the regulation of the current in the coil in the ultra-low impedance environment where the drop-in wireless measurement device is located, so that it can transmit signals normally . The repeater samples and amplifies the electrical signal, and after the filtering operation, it is still converted into an electrical signal and continues to transmit the signal to the ground.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, etc., All should be included within the protection scope of the present invention.

Claims (8)

1. a casting and fishing type underground wireless transmission system, is characterized in that, comprises: Fishing type downhole measuring device, used to measure the temperature, pressure, flow rate, water content in the tubing in the deep well casing and convert it into electrical signals; ground surveillance devices, located on the surface of the earth, for receiving and processing said electrical signals; The automatic setting device is located at the periphery of the casting and fishing type downhole measuring device, and is used to fix the casting and fishing type downhole measuring device on the inner wall of the tubing; The pre-embedded antenna is located on the periphery of the casing. When a signal transmission loop is formed, the electrical signal is transmitted to obtain the parameters of the downhole fluid; it is used to transmit the wireless charging signal when the fishing-type downhole measurement device performs wireless charging. 2 . The downhole wireless transmission system for casting and fishing according to claim 1 , wherein the automatic setting device fixes the casting and fishing type downhole measuring device at a set position when receiving a fixed signal, and when receiving a fixed signal, the After the signal, it will automatically return to the setting state. 3. The downhole wireless transmission system according to claim 1, characterized in that, a transformer coil is installed on the outer wall of the oil pipe where the downhole measurement device is located, for corresponding to the downhole measurement device. After the impedance transformation of the position, the oil pipe is used as the transmission path, and the transformer coil, bushing, and the ground form a transmission circuit to transmit electrical signals. 4. The drop-in underground wireless transmission system according to claim 3, wherein the ratio k of the gates of the primary coil and the secondary coil on the transformer coil is greater than 100, which is used to increase the impedance to the value of the original value. k ² times. 5. A wireless charging device based on the casting and fishing type underground wireless transmission system according to claim 1, when the casting and fishing type underground wireless transmission system needs to be charged, the pre-embedded antenna inputs a wireless charging signal, it is characterized in that, also comprises: The ground power supply device transmits power to the embedded antenna through the power amplifier. 6 . A wireless charging method based on the wireless charging device according to claim 5 , wherein when it is detected that the power of the cast-and-fishing downhole measuring device is insufficient, the ground power supply device is activated, and a power amplifier is transmitted to the embedded antenna. 7 . The high-power signal realizes the wireless charging of the cast-and-fish downhole measurement device. 7. An installation method based on the casting and fishing underground wireless transmission system according to any one of claims 1 to 4, wherein the method comprises the following steps: S1. Lower the casting and fishing type downhole measuring device into the tubing through the casting and fishing device, trigger the automatic setting device at a preset position, fix the casting and fishing type downhole measuring device, and take out the casting and fishing device; S2. When it is necessary to overhaul the cast-and-fish downhole measuring device, run the cast-and-fishing device and connect it to the cast-and-fish downhole measuring device, trigger the automatic cancellation of the setting device, release the cast-and-fish downhole measuring device, and take out the cast-and-fish underground measuring device. measuring device. 8. A measurement method based on the casting and fishing downhole wireless transmission system according to any one of claims 1 to 4, wherein the temperature, pressure, flow rate, The water content is converted into an electrical signal, and the electrical signal is transmitted using the oil pipe as the transmission path and the transformer coil, bushing, and the earth to form a transmission loop to transmit the electrical signal.

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