Underground instrument work maintaining system

Abstract

The invention provides a downhole instrument work maintaining system, and belongs to the technical field of petroleum drilling, the downhole instrument work maintaining system comprises a downhole instrument, the downhole instrument comprises a measurement-while-drilling instrument, a controller and a power supply unit, and the power supply unit comprises a storage battery capable of charging and discharging and a receiving instrument; the underground instrument ground energy supply system transmits radio frequency signals to the drilling direction of the drilling machine, and the radio frequency signals are transmitted to an underground receiving module through a plurality of relay units; and the receiving module converts the radio frequency signal into electric energy and transmits the electric energy to the power supply unit so as to charge the power supply unit. On one hand, the defects existing in power supply of an underground generator or an underground battery are overcome, and on the other hand, the problem that normal work is affected by temperature rise of an underground instrument is solved.

Description

Technical Field

[0001] The invention relates to a downhole instrument work maintaining system, belonging to the technical field of oil drilling. Background Art

[0002] As oil and gas development proceeds, the simple and easy-to-develop oil and gas resources have been basically consumed. Now the difficulty of oil and gas development is increasing. Downhole instruments face more complex situations and need to process more data. One of the important problems is that the power consumption of downhole instruments increases, and there are problems with the existing power supply method. In addition, the electronic components inevitably heat up, and the temperature rises, causing the processor to have to run at a lower frequency, affecting operation.

[0003] In order to solve the problem of power supply for downhole instruments, mud generators and batteries are currently used: the mud generator is used to power the circuit when the pump is turned on, and the battery in the drill collar is used to power the circuit when the pump is turned off. Mud generators and power supply batteries have their own shortcomings. The power generation of mud generators depends on the circulation speed of drilling fluid, and the power supply is unstable; batteries take up a lot of space and the power generation time is limited. Summary of the invention

[0004] In view of the above technical problems existing in the prior art, the present invention proposes a downhole instrument operation maintenance system, which on the one hand makes up for the defects of downhole generators or downhole battery power supply, and on the other hand solves the problem of downhole instrument temperature rising and affecting normal operation.

[0005] The present invention proposes a downhole instrument work maintenance system, comprising:

[0006] A downhole instrument, the downhole instrument comprising a measurement while drilling instrument, a controller and a power supply unit, the power supply unit comprising a chargeable and dischargeable battery and a receiving instrument;

[0007] A ground power supply system for downhole instruments, which transmits radio frequency signals in the drilling direction of the drilling rig and transmits them to a receiving module downhole through a number of relay units;

[0008] The receiving module converts the radio frequency signal into electrical energy and transmits it to the power supply unit to complete charging for the power supply unit.

[0009] Energy is transferred by setting up a ground power supply system for downhole instruments and relay units to transmit radio frequency signals, charging the downhole power supply unit to ensure sufficient power supply. This solves the problem that the current downhole generators and batteries of the existing technology cannot meet the current power supply needs as the difficulty of oil and gas development continues to increase and the amount of data to be processed continues to increase.

[0010] A further improvement of the present invention is that the receiving module is connected to a voltage conversion module, and the voltage conversion module is connected to a rectification module;

[0011] The signal receiving module receives the radio frequency signal, the voltage conversion module converts the radio frequency signal into voltage, and transmits the voltage to the battery through the rectifier module.

[0012] The radio frequency signal is preferably an RF radio frequency signal, which supplies power to underground instruments. The ground power supply system includes a high-power radio frequency signal transmitting unit installed on the ground equipment derrick, and the radio frequency signal transmitting unit sends a signal in the drilling direction of the drilling rig.

[0013] Taking into account the formation shielding and the use of rotary steering equipment that makes the drilling trajectory not vertical, which will hinder and shield the transmitted high-frequency signal, it is necessary to install a relay unit on the drill collar short section to ensure continuous transmission of the signal.

[0014] The interval between relay units is determined by the transmission power of the transmitted RF signal. The greater the power, the larger the interval, and the smaller the power, the smaller the interval. The signal will attenuate more as it passes through the relay, so the deeper the drilling, the shorter the relay range.

[0015] When the power signal is relayed to the location of the downhole instrument's short section, the power supply unit receives the RF signal and converts it into DC power, and stores the DC power in the battery for use by the downhole instrument.

[0016] The receiving module receives the radio frequency signal and converts it into an electrical signal. The electrical signal is then converted into a voltage range that can be received by the battery 7 through the voltage conversion module. Considering that the signal reception is greatly affected by external factors and the electrical signal may be discontinuous, it needs to be conditioned and rectified before being given to the battery.

[0017] A further improvement of the present invention is that the rectifier module includes a bridge and a filter circuit.

[0018] A further improvement of the present invention is that the downhole instrument is arranged on an MWD short sub, and the MWD short sub comprises a drill collar, and the upper and lower ends of the drill collar are provided with threads for connecting upstream and downstream components;

[0019] The controller and the power supply unit are arranged inside the drill collar.

[0020] A further improvement of the present invention is that a centralizer is provided on the drill collar; and an input and output cable bundle is provided at the upper end of the drill collar.

[0021] A further improvement of the present invention is that a downhole equipment cooling system is provided on the downhole instrument, and the downhole equipment cooling system comprises:

[0022] A semiconductor heat sink, comprising a heat absorbing end and a heat dissipating end, wherein the heat absorbing end is connected to the heating element through thermal conductive silicone grease, and the heat dissipating end is connected to the inner wall of the drill collar;

[0023] The heat of the heating element is transferred to the heat absorbing end of the semiconductor radiator through the thermal grease, and the semiconductor radiator transfers the heat to the heat dissipating end and to the outer wall of the mud and is taken away by the mud.

[0024] A semiconductor heat sink is used for heat dissipation. The heat sink is attached to the surface of the heating element through a heat dissipation medium such as silicone grease. When the heating element generates heat, the heat is transferred from the hot end to the cold end through the principle of the semiconductor heat sink, and the heat is transferred to the outside of the drill collar through the heat pipe, and the extra heat is taken away by the circulation of the mud.

[0025] In this way, the system can provide support for the normal operation of downhole instruments and avoid the influence of high temperature on the working performance of heating elements.

[0026] A further improvement of the present invention is that a control module is provided on the semiconductor heat sink, and the control module controls the opening or closing of the semiconductor heat sink according to the temperature of the heating element.

[0027] A further improvement of the present invention is that the control module is connected to a power supply and a temperature sensor in a downhole instrument, determines whether heat dissipation is required based on a temperature signal from the temperature sensor, and connects the semiconductor heat sink through a push-pull output circuit of an I / O port of a main control chip.

[0028] When the semiconductor heat sink starts working, the heat is transferred from the heating end to the cold end. The cold end receives the heat and is connected to the inner wall of the drill collar. The heat of the component is transferred to the outer wall of the drill collar through the metal structure of the drill collar, and then the heat is taken away by the mud circulation.

[0029] A further improvement of the present invention is that the downhole instrument further comprises the vibration detection module, which detects whether the connected instrument has abnormal vibration, thereby determining whether there is a problem with the instrument.

[0030] A further improvement of the present invention is that the MWD sub is MatriView Log900 or Matri175°C MWD.

[0031] Compared with the prior art, the advantages of the present invention are:

[0032] The downhole instrument work maintenance system of the present invention aims at the problem of downhole instrument power supply. In the prior art, the circuit is powered by a mud generator when the pump is turned on, and powered by a battery in the drill collar when the pump is turned off. The power generation of the mud generator depends on the circulation speed of the drilling fluid, and the power supply is unstable. The battery power supply occupies a lot of space and has a limited power generation time.

[0033] The downhole instrument operation maintenance system of the present invention proposes a new power supply method, solves the problems of the prior art, and increases the reliability of instrument operation. Moreover, the invention has little impact on the existing design, does not affect the mud generator and battery power supply method, and only requires slight modification to make the existing instrument compatible with this technology.

[0034] The downhole instrument work maintenance system of the present invention adopts a semiconductor heat sink for heat dissipation. The heat sink is attached to the surface of the heating element through a heat dissipation medium such as silicone grease. When the component generates heat, the heat is transferred from the hot end to the cold end through the principle of the semiconductor heat sink, and the heat is transferred to the outside of the drill collar through a heat pipe, and the extra heat is taken away by the circulation of mud.

[0035] The present invention can provide support for the normal operation of downhole instruments and avoid the influence of the working performance of the heating element due to the high temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, in which:

[0037] Figure 1 It is a schematic diagram of the structure of a downhole instrument work maintenance system according to an embodiment of the present invention, showing the structure of the downhole equipment energy supply system;

[0038] Figure 2 The figure shows a schematic structural diagram of an MWD sub according to an embodiment of the present invention;

[0039] Figure 3 The figure is a circuit diagram of a control module of a semiconductor heat sink according to an embodiment of the present invention;

[0040] Figure 4 Shown is a schematic diagram of a downhole equipment cooling system according to an embodiment of the present invention;

[0041] Figure 5 The circuit diagram shown is a circuit diagram of an I / O port push-pull output circuit of a main control chip connected to the semiconductor heat sink in one embodiment of the present invention.

[0042] The drawings are not drawn to scale.

[0043] The meanings of the reference numerals in the accompanying drawings are as follows:

[0044] 1. Downhole instrument, 2. Ground energy supply system for downhole instrument, 3. Relay unit, 4. Power supply unit, 5. Drill collar, 6. Thread, 7. Battery, 8. Controller, 9. MWD, 10. Centralizer, 11. Cable bundle, 12. Semiconductor heat sink, 13. Cold end, 14. Hot end. DETAILED DESCRIPTION

[0045] In order to make the technical solutions and advantages of the present invention more clearly understood, the exemplary embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than an exhaustive list of all the embodiments. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0046] As oil and gas development proceeds, the simple and easy-to-develop oil and gas resources have been basically consumed. Now the difficulty of oil and gas development is increasing. Downhole instruments face more complex situations and need to process more data. One of the important problems is that the power consumption of downhole instruments increases, and there are problems with the existing power supply method. In addition, the electronic components inevitably heat up, and the temperature rises, causing the processor to have to run at a lower frequency, affecting operation.

[0047] In order to solve the problem of power supply for downhole instruments, mud generators and batteries are currently used: the mud generator is used to power the circuit when the pump is turned on, and the battery in the drill collar is used to power the circuit when the pump is turned off. Mud generators and power supply batteries have their own shortcomings. The power generation of mud generators depends on the circulation speed of drilling fluid, and the power supply is unstable; batteries take up a lot of space and the power generation time is limited.

[0048] To solve the above problems, the present invention proposes a drill pipe with signal transmission and friction and drag reduction functions, which can transmit signals for downhole power drilling tools while providing power, and has the function of reducing friction and drag, thereby alleviating the phenomenon of the drill pipe adhering to the well wall during the drilling process.

[0049] Figure 1 A downhole instrument maintenance system according to the present invention is schematically shown, comprising:

[0050] A downhole instrument 1, wherein the downhole instrument 1 comprises a measurement while drilling instrument, a controller 8 and a power supply unit 4, wherein the power supply unit 4 comprises a chargeable and dischargeable storage battery 7 and a receiving instrument;

[0051] A ground power supply system 2 for the downhole instrument 1, wherein the ground power supply system 2 for the downhole instrument 1 transmits a radio frequency signal in the drilling direction of the drilling rig, and transmits the signal to a receiving module in the downhole through a plurality of relay units 3;

[0052] The receiving module converts the radio frequency signal into electrical energy and transmits it to the power supply unit 4 to complete charging of the power supply unit 4 .

[0053] According to the downhole instrument work maintenance system described in this embodiment, the downhole instrument 1 is set to transmit radio frequency signals through the ground power supply system 2 and the relay unit 3 to transmit energy, so as to charge the downhole power supply unit 4 and ensure sufficient power supply. The problem that the difficulty of oil and gas development is increasing, the amount of data to be processed is increasing, and the downhole generator and battery 7 of the existing technology cannot meet the current power supply demand is solved.

[0054] In one embodiment, the receiving module is connected to a voltage conversion module, and the voltage conversion module is connected to a rectification module;

[0055] The signal receiving module receives the radio frequency signal, the voltage conversion module converts the radio frequency signal into a voltage, and transmits the voltage to the storage battery 7 through the rectifier module.

[0056] The receiving module transmits the received RF signal to the voltage conversion module, which converts the energy of the RF signal into voltage. The voltage is then rectified by the rectifier module to form a stable voltage that meets the battery charging requirements, which is then transmitted to the battery 7 to complete the charging. Through the above-mentioned receiving module, voltage conversion module and rectifier module, the RF signal is converted into voltage, thereby completing the charging of the battery.

[0057] In a preferred embodiment, the radio frequency signal is an RF radio frequency signal.

[0058] According to the downhole instrument working maintenance system described in this embodiment, this embodiment uses RF radio frequency signals to power underground instruments. The ground power supply system includes a high-power radio frequency signal transmitting unit installed on the ground equipment derrick, which sends signals in the drilling direction of the drilling rig. Taking into account the formation shielding and the use of rotary guide equipment that makes the drilling trajectory not vertical, it will have an obstruction and shielding effect on the transmitted high-frequency signal. Therefore, it is necessary to install a relay unit 3 on the short section of the drill shank 5 to ensure continuous transmission of the signal.

[0059] The interval of the relay unit 3 is determined by the transmission power of the transmitted radio frequency signal. The greater the power, the larger the interval. The signal will attenuate more as it passes through the relay. Therefore, the deeper the drilling, the shorter the relay range.

[0060] When the power signal is relayed to the position of the short section where the downhole instrument 1 is located, the power supply unit 4 receives the radio frequency signal and converts it into a DC power supply, which is stored in the battery 7 and provided to the downhole instrument 1 for use.

[0061] The receiving module receives the radio frequency signal and converts it into an electrical signal. The electrical signal is then converted into a voltage range that can be received by the battery 7 through the voltage conversion module. Considering that the signal reception is greatly affected by external factors and the electrical signal may be discontinuous, it needs to be conditioned and rectified before being given to the battery 7.

[0062] In a preferred embodiment, the rectifier module includes a bridge and a filter circuit.

[0063] The bridge has high accuracy and sensitivity, and can measure very small resistance differences, so it is used in some precision measurements. In addition, the bridge can also be used to measure the DC resistance of devices with inductance characteristics, especially for large power transformers and mutual inductors. It has the characteristics of simple and rapid measurement and clear operation.

[0064] A filter circuit is a circuit used to suppress or pass a specific frequency signal. Its function is to minimize the AC component in the pulsating DC voltage, retain its DC component, reduce the output voltage ripple factor, and make the waveform smoother. In the rectifier circuit, the filter circuit can remove the AC component in the DC output voltage to make the output voltage smoother. In the audio circuit, the filter circuit can remove unnecessary frequency components to make the output sound clearer. In the RF circuit, the filter circuit can remove unnecessary noise and interference, make the signal purer, and improve the signal quality.

[0065] In one embodiment, the downhole instrument 1 is arranged on an MWD short sub, and the MWD short sub comprises a drill collar 5, and the upper and lower ends of the drill collar 5 are provided with threads 6 for connecting upstream and downstream components;

[0066] The controller 8 and the power supply unit 4 are arranged inside the drill collar 5 to control the operation of other components and provide power to other components.

[0067] In one embodiment, a centralizer 10 is provided on the drill collar 5. Preferably, there are two centralizers 10, which are respectively provided at the upper part and the lower part, for centering the drill collar 5 in the wellbore. An input and output cable bundle 11 is provided at the upper end of the drill collar 5 for input and output signals, for example, transmitting electric energy through the cable bundle 11 to provide electric energy to downhole equipment.

[0068] The centralizer 10 can ensure that the drill collar 5 is in a centered state. The cable bundle 11 can transmit electrical energy and can also be configured as a cable for transmitting signals according to different needs.

[0069] In one embodiment, the downhole instrument 1 is provided with a downhole equipment cooling system, and the downhole equipment cooling system comprises:

[0070] The semiconductor heat sink 12 includes a heat absorbing end 14 and a heat dissipating end 14, wherein the heat absorbing end 14 is connected to the heating element through thermal conductive silicone grease, and the heat dissipating end 14 is connected to the inner wall of the drill collar 5;

[0071] The heat of the heating element is transferred to the heat absorbing end 14 of the semiconductor radiator through the thermal grease, and the semiconductor radiator transfers the heat to the heat dissipating end 14 and to the outer wall of the mud and is taken away by the mud.

[0072] In the downhole maintenance system according to the present embodiment, a semiconductor heat sink 12 is used for heat dissipation, which provides a method of attaching the heat sink to the surface of the heating element through a heat dissipation medium such as silicone grease. When the component generates heat, the heat is transferred from the hot end 14 to the cold end 13 through the principle of the semiconductor heat sink 12, and the heat is transferred to the outside of the drill collar 5 through the heat pipe, and the extra heat is taken away by the circulation of mud.

[0073] The present invention can provide support for the normal operation of the downhole instrument 1, and avoid the influence of the working performance of the heating element due to the high temperature.

[0074] In one embodiment, a control module is provided on the semiconductor heat sink 12, and the control module controls the opening or closing of the semiconductor heat sink 12 according to the temperature of the heating element. The control module can be integrated with the controller 8, or can be provided separately for heat dissipation.

[0075] In one embodiment, the control module is connected to a power supply and a temperature sensor in the downhole instrument 1, determines whether heat dissipation is required based on a temperature signal from the temperature sensor, and connects the semiconductor heat sink 12 via an I / O port push-pull output circuit of the main control chip.

[0076] In one embodiment, the downhole instrument 1 further comprises the vibration detection module, which detects whether the connected instrument has abnormal vibration, so as to determine whether there is a problem with the instrument.

[0077] Preferably, the MWD sub is MatriView Log900 or Matri 175°C MWD.

[0078] This embodiment uses a semiconductor heat sink 12 for heat dissipation. The heat sink is attached to the surface of the heating element through a heat dissipation medium such as silicone grease. When the component generates heat, the heat is transferred from the hot end 14 to the cold end 13 through the principle of the semiconductor heat sink 12, and the heat is transferred to the outside of the drill collar 5 through the heat pipe, and the extra heat is taken away by the circulation of mud.

[0079] The heating element is directly connected to the semiconductor heat sink 12 through a heat-conducting medium such as silicone grease. The semiconductor heat sink 12 is powered by the power supply system of the downhole instrument 1. The temperature sensor in the downhole instrument 1 is used to determine whether heat dissipation is needed. Through an I / O port (pins can be reused) and a transistor of the main control chip, it is determined whether the heat dissipation function needs to be turned on. Heat dissipation is turned on only when the heat generation is large to save electricity.

[0080] When the semiconductor heat sink 12 starts working, the heat is transferred from the heating end 14 to the cold end 13. The cold end 13 receives the heat and is connected to the inner wall of the drill collar 5. The heat of the component is transferred to the outer wall of the drill collar 5 through the metal structure of the drill collar 5, and then the heat is taken away by the mud circulation.

[0081] The downhole instrument work maintenance system of the present invention aims at the problem of downhole instrument power supply. In the prior art, the circuit is powered by a mud generator when the pump is turned on, and powered by a battery in the drill collar when the pump is turned off. The power generation of the mud generator depends on the circulation speed of the drilling fluid, and the power supply is unstable. The battery power supply occupies a lot of space and has a limited power generation time.

[0082] The downhole instrument operation maintenance system of the present invention proposes a new power supply method, solves the problems of the prior art, and increases the reliability of instrument operation. Moreover, the invention has little impact on the existing design, does not affect the mud generator and battery power supply method, and only requires slight modification to make the existing instrument compatible with this technology.

[0083] The downhole instrument work maintenance system of the present invention adopts a semiconductor heat sink for heat dissipation. The heat sink is attached to the surface of the heating element through a heat dissipation medium such as silicone grease. When the component generates heat, the heat is transferred from the hot end to the cold end through the principle of the semiconductor heat sink, and the heat is transferred to the outside of the drill collar through a heat pipe, and the extra heat is taken away by the circulation of mud.

[0084] The present invention can provide support for the normal operation of downhole instruments and avoid the influence of the working performance of the heating element due to the high temperature.

[0085] It should be understood that the embodiments disclosed in the present invention are not limited to the specific structures, processing steps or materials disclosed herein, but should be extended to equivalent substitutions of these features understood by ordinary technicians in the relevant field. It should also be understood that the terms used herein are only used for the purpose of describing specific embodiments and are not meant to be limiting.

[0086] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0087] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0088] Certain terms are used throughout this specification to refer to specific system components. As will be appreciated by those skilled in the art, different names may be used to refer to the same component, and thus this specification is not intended to distinguish between components that differ only in name and not in function. References to "one embodiment" or "an embodiment" in the specification mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the invention. Therefore, the phrases "one embodiment" or "an embodiment" appearing in various places throughout the specification do not necessarily all refer to the same embodiment.

[0089] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

[0090] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and / or modifications that fall within the scope of the present invention, and changes and / or modifications made according to the embodiments of the present invention should be included within the scope of protection of the present invention.

Claims

1. A downhole instrument work maintenance system, characterized in that: include: A downhole instrument (1), the downhole instrument (1) comprising a measurement while drilling instrument, a controller (8) and a power supply unit (4), the power supply unit (4) comprising a chargeable and dischargeable storage battery (7) and a receiving instrument; A ground power supply system (2) for a downhole instrument (1), wherein the ground power supply system (2) for the downhole instrument (1) transmits a radio frequency signal in the drilling direction of the drilling rig and transmits the signal to a receiving module downhole via a plurality of relay units (3); The receiving module converts the radio frequency signal into electrical energy and transmits it to the power supply unit (4), thereby completing the charging of the power supply unit (4).

2. The downhole instrument work maintenance system according to claim 1, characterized in that: The receiving module is connected to the voltage conversion module, and the voltage conversion module is connected to the rectification module; The signal receiving module receives the radio frequency signal, the voltage conversion module converts the radio frequency signal into a voltage, and transmits the voltage to the storage battery (7) through the rectification module.

3. The downhole instrument operation maintenance system according to claim 2, characterized in that: The rectifier module includes a bridge and a filter circuit.

4. The downhole instrument work maintenance system according to claim 3, characterized in that: The downhole instrument (1) is arranged on an MWD short sub, and the MWD short sub comprises a drill collar (5), and the upper and lower ends of the drill collar (5) are provided with threads (6) for connecting upstream and downstream components; The controller (8) and the power supply unit (4) are arranged inside the drill collar (5).

5. The downhole instrument operation maintenance system according to claim 4, characterized in that: A centralizer (10) is arranged on the drill collar (5); an input and output cable bundle (11) is arranged at the upper end of the drill collar (5).

6. The downhole instrument work maintenance system according to claim 4 or 5, characterized in that: The downhole instrument (1) is provided with a downhole equipment cooling system, and the downhole equipment cooling system comprises: A semiconductor heat sink (12) comprising a heat absorbing end (14) and a heat dissipating end (14), wherein the heat absorbing end (14) is connected to the heating element via thermally conductive silicone grease, and the heat dissipating end (14) is connected to the inner wall of the drill collar (5); The heat of the heating element is transferred to the heat absorbing end (14) of the semiconductor radiator through the thermal grease, and the semiconductor radiator transfers the heat to the heat dissipating end (14), and then to the outer wall of the mud and is taken away by the mud.

7. The downhole equipment cooling system according to claim 6, characterized in that: A control module is provided on the semiconductor heat sink (12), and the control module controls the opening or closing of the semiconductor heat sink (12) according to the temperature of the heating element.

8. The downhole equipment cooling system according to claim 6, characterized in that: The control module is connected to a power source and a temperature sensor in a downhole instrument (1), determines whether heat dissipation is required based on a temperature signal from the temperature sensor, and connects to the semiconductor heat sink (12) via a push-pull output circuit of an I / O port of a main control chip.

9. The downhole equipment cooling system according to claim 8, characterized in that: The downhole instrument (1) also includes the vibration detection module, which detects whether the connected instrument has abnormal vibration, thereby determining whether there is a problem with the instrument.

10. The downhole instrument operation maintenance system according to claim 4, characterized in that: The MWD short section is MatriView Log900 or Matri 175°C MWD.

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