A downhole instrument cooling control system and method

Abstract

The application discloses a downhole instrument cooling control system and method, which comprises a cooling liquid carrying module, a central control cooling module, and the like. The cooling liquid carrying module is used for being put into from a wellhead when the cooling liquid in the central control cooling module reaches a high temperature state, and after realizing physical connection with the central control cooling module, the carried cooling liquid is introduced into the central control cooling module. The central control cooling module is integrated in a downhole measuring instrument and sets hardware circuit in the downhole measuring instrument in the cooling liquid in the central control cooling module. The central control cooling module is used for controlling realization of physical connection between the central control cooling module and the cooling liquid carrying module when the cooling liquid carrying module is detected to arrive. When the cooling liquid in the central control cooling module reaches the high temperature state, the central control cooling module informs the ground to put the cooling liquid carrying module. The application can cool the instrument working in a well, and can further improve temperature resistance, working safety and stability of the instrument under an ultrahigh temperature condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of while-drilling measurement and control, and particularly relates to a downhole instrument cooling control system and method. BACKGROUND

[0002] Measurement while drilling (MWD) and logging while drilling (LWD) can provide real-time directional parameters, engineering parameters, geological parameters and other information during drilling, facilitate well trajectory adjustment, and improve drilling success rate, and are key equipment for future automated and intelligent drilling.

[0003] Formation temperature increases with the increase of formation depth, and the average geothermal gradient of the earth is about 3℃ / 100m, and the temperature resistance of downhole instruments directly restricts the drilling of ultra-deep wells above 10,000m, so high temperature resistance is the main development direction of MWD / LWD instruments.

[0004] At present, the temperature resistance of hardware circuit systems is improved by high-temperature circuit design and low-power design, so as to improve the temperature resistance of downhole instruments. The design methods of high-temperature circuits include three kinds of traditional methods, hybrid circuit methods and special functional circuit methods. Specifically, the traditional method optimizes the design of electronic components by using high-temperature resistant design, reducing the power consumption of electronic components, and selecting heat-resistant raw materials; the hybrid circuit method uses integrated chips and thick film technology to design circuits; and the special functional circuit method is a special design method specially designed for integrated circuits. The low-power design method includes reducing the power supply voltage, implementing frequency reduction, reducing the load capacitance, and implementing intelligent control of firmware.

[0005] Due to the limitations of the existing technology, the temperature resistance of hardware circuit systems is improved by optimizing the hardware circuit structure, using high-temperature resistant electronic components, and optimizing the power consumption design, but there are still technical bottlenecks that cannot be overcome for further improving the temperature resistance of instruments, and the instruments cannot work for a long time under the condition of downhole ultra-high temperature, which is difficult to meet the needs of ultra-deep and ultra-high temperature drilling. SUMMARY

[0006] The present application aims to provide a control scheme for cooling downhole instruments, so as to improve the temperature resistance, working safety and stability of downhole instruments under the condition of downhole ultra-high temperature, and prolong the service life of the instruments.

[0007] In order to solve the above technical problems, the embodiment of the present application provides a downhole instrument cooling control system, comprising: a cooling liquid carrying module, which is used for being put into from a wellhead when cooling liquid in a central control cooling module reaches a high temperature state, and after realizing physical connection with the central control cooling module, the carried cooling liquid is introduced into the central control cooling module; the central control cooling module is integrated in a downhole measuring instrument and sets hardware circuit in the downhole measuring instrument in the cooling liquid in the central control cooling module, and the central control cooling module is used for controlling realization of physical connection between itself and the cooling liquid carrying module when the cooling liquid carrying module is detected to reach, wherein, when the internal cooling liquid reaches the high temperature state, the cooling liquid carrying module is informed to be put into from the ground.

[0008] Preferably, the central control cooling module is also used for controlling disconnection of the physical connection between itself and the cooling liquid carrying module after the cooling liquid of the cooling liquid carrying module is completely introduced out, so that the cooling liquid carrying module floats to the wellhead by the buoyancy of drilling fluid, wherein the average density of the cooling liquid carrying module loaded with the cooling liquid is greater than the density of the drilling fluid, and the density of the drilling fluid is greater than the average density of the cooling liquid carrying module after the cooling liquid is introduced out.

[0009] Preferably, the cooling liquid carrying module is put into by transmitting an abnormal temperature value or a put-in instruction signal of the cooling liquid to the ground, and the ground system receives, so that the ground system controls the put-in of the cooling liquid carrying module.

[0010] Preferably, the downhole measuring instrument is used for detecting the temperature of the cooling liquid in the cooling space in the central control cooling module in real time, and informing the ground when the real-time cooling liquid temperature reaches or is higher than a preset temperature threshold, otherwise, the cooling liquid in the cooling space is continuously used to cool and lower the temperature of the hardware circuit of the downhole measuring instrument.

[0011] Preferably, the central control cooling module is also used for detecting the position of the cooling liquid carrying module in real time, magnetizing when the cooling liquid carrying module is detected to move to the detection boundary of the central control cooling module, and emitting electromagnetic force to the cooling liquid carrying module to realize physical connection between the cooling liquid carrying module and the central control cooling module.

[0012] Preferably, the central control cooling module is also used for controlling the internal flow guide opening to be opened and matched with the flow guide opening in the cooling liquid carrying module after realizing physical connection with the cooling liquid carrying module, wherein the cooling liquid carrying module is also used for controlling the internal flow guide opening to be opened after realizing physical connection with the central control cooling module, so as to realize conduction of the internal spaces of the two modules.

[0013] Preferably, before the guide port is docked, the central control cooling module is further used to drain the cooling liquid in the high-temperature state inside to the high-temperature cooling liquid storage tank inside.

[0014] Preferably, the central control cooling module is further used to control the internal guide port to be closed and demagnetized after the cooling liquid is guided, so as to break the physical connection between the central control cooling module and the cooling liquid carrying module, and the cooling liquid carrying module is further used to control the internal guide port to be closed after the cooling liquid is guided.

[0015] Preferably, the downhole measuring instrument is an MWD instrument or an EM-MWD instrument or an LWD instrument.

[0016] In another aspect, a downhole instrument cooling control method is provided, which is implemented by using the downhole instrument cooling control system as described above, and the downhole instrument cooling control method comprises the following steps: integrating a central control cooling module into a downhole measuring instrument and arranging a hardware circuit in the downhole measuring instrument inside the cooling liquid in the central control cooling module; informing the ground to launch a cooling liquid carrying module when the cooling liquid inside the central control cooling module is detected to reach a high-temperature state; launching the cooling liquid carrying module from a wellhead when the cooling liquid inside the central control cooling module reaches a high-temperature state; controlling the central control cooling module to realize physical connection with the cooling liquid carrying module when the central control cooling module detects that the cooling liquid carrying module arrives; and guiding the carried cooling liquid into the central control cooling module by the cooling liquid carrying module.

[0017] Compared with the prior art, one or more embodiments in the above solution can have the following advantages or beneficial effects:

[0018] The present application provides a downhole instrument cooling control system and method. The system and method comprise a modular architecture and a running control process of the downhole instrument cooling control system. Under the existing technical level of hardware circuit structure and temperature resistance of electronic components, after the temperature resistance of the instrument hardware circuit system reaches the design limit, the instrument lowered into the well is cooled by the control system and method for downhole instrument cooling provided by the present application, which can further improve the temperature resistance, working safety and stability of the instrument under super-high temperature conditions, prolong the service life of the instrument, ensure the working ability of the instrument under super-high temperature conditions, meet the application requirements of super-deep and super-high temperature drilling, and improve the drilling efficiency.

[0019] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by the structure particularly pointed out in the specification, claims and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings are included to provide a further understanding of the present application and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and are used to explain the present application, but are not intended to limit the present application. In the drawings:

[0021] Figure 1 It is a whole structure schematic diagram of the downhole instrument cooling control system of the embodiment of the present application.

[0022] Figure 2 It is an implementation flow schematic diagram of the downhole instrument cooling control system of the embodiment of the present application.

[0023] Figure 3 It is a step schematic diagram of the downhole instrument cooling control method of the embodiment of the present application. DETAILED DESCRIPTION

[0024] The embodiments of the present application will be described in detail hereinafter with reference to the accompanying drawings and embodiments, so that how the present application applies technical means to solve technical problems and achieves technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, each embodiment in the present application and each feature in each embodiment can be combined with each other, and the technical solutions formed thereby are all within the protection scope of the present application.

[0025] In addition, the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a group of computer executable instructions. Moreover, although the logical order is shown in the flowchart, in some cases, the steps shown or described herein can be executed in an order different from that shown herein.

[0026] The terms used herein are only used for describing specific embodiments and are not intended to limit the exemplary embodiments. Unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" used herein are also intended to include the plural. It should also be understood that the terms "comprise" and / or "include" used herein specify the presence of stated features, integers, steps, operations, units and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, units, components and / or combinations thereof.

[0027] Measurement while drilling (MWD) and logging while drilling (LWD) can provide directional parameters, engineering parameters, geological parameters and other information in real time during drilling, facilitate well trajectory adjustment, and improve drilling success rate, and are key equipment for future automated and intelligent drilling.

[0028] The formation temperature increases with the increase of the formation depth, and the average geothermal gradient of the earth is about 3℃ / 100m. The temperature resistance of downhole instruments directly restricts the drilling of ultra-deep wells above 10,000m, and therefore, high temperature resistance is the main development direction of MWD / LWD instruments.

[0029] At present, the temperature resistance of the hardware circuit system is improved mainly by high-temperature circuit design and low-power consumption design, so as to improve the temperature resistance of the downhole instrument. The design methods of high-temperature circuit include three kinds of traditional method, hybrid circuit method and special function circuit method. Specifically, the traditional method mainly optimizes the design of the electronic components by using high-temperature resistant design, reducing the power consumption of the electronic components, and selecting heat-resistant raw materials; the hybrid circuit method uses integrated chips and thick film technology to design the circuit; the special function circuit method is a special design method specially designed for integrated circuits. The low-power consumption design method includes reducing the supply voltage, implementing frequency reduction, reducing the load capacitance, and implementing intelligent control of the firmware.

[0030] Due to the existing technical level, the temperature resistance of the hardware circuit system is improved by optimizing the hardware circuit structure, using high-temperature resistant electronic components, and optimizing the power consumption design. However, there is still a technical bottleneck that cannot be overcome for further improving the temperature resistance of the instrument, and the instrument cannot work for a long time under the downhole super-high temperature condition, which makes it difficult to meet the needs of ultra-deep and super-high temperature drilling.

[0031] Therefore, in order to solve the above technical problems, the embodiments of the present application propose a downhole instrument cooling control system and method. The system and method improve the temperature resistance, working safety and stability of the instrument under the downhole super-high temperature condition by cooling the downhole instrument, prolong the service life of the instrument, ensure the working ability of the instrument under the super-high temperature condition, meet the application needs of ultra-deep and super-high temperature drilling, and improve the drilling efficiency.

[0032] Figure 1 The downhole instrument cooling control system of the embodiments of the present application is shown in the overall structure diagram. As shown in Figure 1 The downhole instrument cooling control system (also referred to as "cooling control system") includes a central control cooling module 10 and a cooling liquid carrying module 20.

[0033] The central control cooling module 10 is integrated in the downhole measuring instrument, and is electrically and physically connected with the hardware circuit system in the downhole measuring instrument, so as to work with the downhole measuring instrument. Moreover, the hardware circuit in the downhole measuring instrument is stored in the cooling liquid in the cooling space inside the central control cooling module 10. In the central control cooling module 10, a cooling space for storing cooling liquid is arranged, so as to use the cooling liquid in the cooling space to cool the hardware circuit in the working downhole measuring instrument.

[0034] That is, the central control cooling module 10 cools the downhole measuring instrument by the cooling liquid carried in the cooling space of the module itself, when the cooling liquid carried into the well cannot meet the cooling demand of the instrument, the cooling liquid carrying module 20 is put into the well from the wellhead, and then the communication between the modules, the physical connection between the modules and the import of the cooling liquid (newly carried) are realized by the central control cooling module 10.

[0035] Specifically, a high-temperature cooling liquid storage tank is arranged below the cooling space, so that when the cooling liquid in the cooling space reaches a high-temperature state, after realizing the physical connection between the central control cooling module 10 and the cooling liquid carrying module 20, the high-temperature cooling liquid in the cooling space is discharged into the high-temperature cooling liquid storage tank, so that the empty cooling space can accommodate the new cooling liquid introduced by the cooling liquid carrying module 20, thereby continuing to cool the hardware circuit in the downhole measuring instrument by the newly introduced cooling liquid.

[0036] The cooling liquid carrying module 20 is internally provided with cooling liquid, which is put into the well from the wellhead and moves along the wellbore under the action of its own gravity, and when it is lowered to the position of the downhole measuring instrument, the cooling liquid in the cooling liquid carrying module 20 is introduced into the cooling space in the central control cooling module 10 for instrument cooling under the control of the central control cooling module 10. After the cooling liquid is completely discharged, the cooling liquid carrying module 20 returns to the ground under the action of the buoyancy of the drilling fluid.

[0037] Therefore, the cooling liquid carrying module 20 described in the embodiment of the present application is used to be put into the well from the wellhead and move downward along the wellbore when the cooling liquid in the central control cooling module 10 reaches a high-temperature state, and the carried cooling liquid is introduced into the central control cooling module 10 after the physical connection between the cooling liquid carrying module 20 and the central control cooling module 10 is realized. In addition, the central control cooling module 10 is used to control the realization of the physical connection between itself and the cooling liquid carrying module 20 when the cooling liquid carrying module 20 is detected. When the cooling liquid in the central control cooling module 10 reaches a high-temperature state, the downhole measuring instrument detects and informs the ground to put the cooling liquid carrying module 20.

[0038] In one embodiment, the downhole measuring instrument described in the embodiment of the present application is a measurement-while-drilling (MWD) instrument or a logging-while-drilling (LWD) instrument or an EM-MWD instrument.

[0039] Figure 2 The implementation flowchart of the downhole instrument cooling control system of the embodiment of the present application is shown. The specific functions and implementation flow of the cooling control system described in the embodiment of the present application will be described below. Figure 1 and Figure 2 The specific functions and implementation flow of the cooling control system described in the embodiment of the present application will be described below.

[0040] In actual application, the central control cooling module 10 is integrated in the downhole measuring instrument, the power bus of the downhole measuring instrument provides operating power for the central control cooling module 10, the central control cooling module 10 provides specific installation space (i.e. cooling space) for the hardware circuit system of the downhole measuring instrument, and the cooling space contains cooling liquid, so that the hardware circuit system in the downhole measuring instrument is immersed in the cooling liquid.

[0041] After the downhole measuring instrument is lowered into the well, the central control cooling module 10 cools the hardware circuit in the downhole measuring instrument by the cooling liquid carried into the well.

[0042] The downhole measuring instrument is used to detect the real-time cooling liquid temperature in the cooling space of the central control cooling module 10, and when the real-time cooling liquid temperature reaches or is higher than the preset temperature threshold (the preset temperature threshold is determined according to the maximum temperature resistance value of the downhole measuring instrument, such as 180℃), it indicates that the cooling liquid in the central control cooling module 10 is in a high temperature (abnormal) state at present, at this time, the ground needs to be immediately notified to put the cooling liquid carrying module 20. In addition, when the downhole measuring instrument detects that the real-time cooling liquid temperature is lower than the preset temperature threshold, it indicates that the cooling liquid in the central control cooling module 10 is not in a high temperature abnormal state at present, at this time, the cooling liquid in the cooling space is continued to be used to cool and cool the hardware circuit of the downhole measuring instrument.

[0043] In one embodiment, the downhole measuring instrument transmits the cooling liquid abnormal temperature value or the put instruction signal to the ground, and is received by the ground system, so that the ground system automatically controls the cooling liquid carrying module 20 to be put into the wellhead after receiving the cooling liquid abnormal temperature value or the put instruction signal. It should be noted that the cooling liquid abnormal temperature value refers to the real-time cooling liquid temperature in the high temperature abnormal state when the real-time cooling liquid temperature reaches or is higher than the preset temperature threshold. The put instruction signal is preferably a byte code of an instruction for indicating that the cooling liquid carrying module 20 needs to be put.

[0044] That is, the downhole instrument measures the cooling liquid temperature, and the downhole measuring instrument transmits the (abnormal) temperature measurement value of the cooling liquid or the byte code of the cooling liquid carrying module put instruction signal to the ground.

[0045] After the surface system receives the information transmitted from the downhole measuring instrument, the delivery task of the cooling liquid carrying module 20 is instructed and controlled by decoding the cooling liquid measurement value or the delivery instruction signal. Specifically, if the received real-time temperature of the cooling liquid is lower than the preset temperature threshold or the delivery instruction of the cooling liquid carrying module is zero, it indicates that the current cooling liquid is not in an abnormal high-temperature state, and at this time, the cooling liquid carrying module 20 does not need to be delivered; when the real-time temperature of the cooling liquid reaches or is higher than the preset temperature threshold or the delivery instruction of the cooling liquid carrying module 20 is non-zero data (valid delivery instruction), at this time, the cooling liquid carrying module 20 needs to be delivered, so that the cooling liquid carrying module 20 is launched from the wellhead into the wellbore, so that the cooling liquid carrying module 20 moves down the wellbore.

[0046] Next, the central control cooling module 10 is also used to detect the position of the cooling liquid carrying module 20 (moving down the wellbore) in real time, magnetize when detecting that the cooling liquid carrying module 20 moves to the detection boundary of the central control cooling module 10, and emit an electromagnetic force to the cooling liquid carrying module 20 to realize the physical connection between the cooling liquid carrying module 20 and the central control cooling module 10. Specifically, the cooling liquid carrying module 20 moves downward in the wellbore, and when it moves to the detection boundary distance of the central control cooling module 10, the central control cooling module 10 begins to magnetize to emit an electromagnetic force to the cooling liquid carrying module 20, so that the cooling liquid carrying module 20 is attracted by the electromagnetic force of the central control cooling module 10, thereby realizing the physical connection of the two modules.

[0047] Then, before the flow guide port of the central control cooling module 10 and the flow guide port of the cooling liquid carrying module 20 are docked, the central control cooling module 10 is also used to drain the cooling liquid in the high-temperature state in the interior to the high-temperature cooling liquid storage tank in the interior, thereby draining the high-temperature cooling liquid to the high-temperature cooling liquid storage tank. Specifically, the central control cooling module 10 controls the opening of the drainage port between the cooling space and the high-temperature cooling liquid storage tank, so that the high-temperature cooling liquid is guided out through the drainage flow channel between the cooling space and the high-temperature cooling liquid storage tank under the action of gravity, and then the central control cooling module 10 controls the closing of the drainage port.

[0048] Next, the central control cooling module 10 is also used to control the opening of the (first) flow guide port in the interior and the docking with the (second) flow guide port in the cooling liquid carrying module 20 after the physical connection with the cooling liquid carrying module 20 is realized. The first flow guide port is arranged above the cooling space of the central control cooling module 10, and the second flow guide port is arranged below the cooling liquid carrying module 20, so as to complete the docking of the flow guide ports after the physical connection of the module 10 and the module 20 is realized. In addition, the cooling liquid carrying module 20 is also used to control the opening of the (second) flow guide port in the interior (by the cooling liquid carrying module 20) after the physical connection with the central control cooling module 10 is realized, so as to realize the conduction of the cooling space in the central control cooling module 10 and the interior space of the cooling liquid carrying module 20.

[0049] Specifically, the two modules are connected by opening the flow ports of the two modules through the internal electromechanical structures of the central control cooling module 10 and the cooling fluid carrying module 20, and the internal spaces of the two modules are communicated, so that the new cooling fluid is poured into the cooling space of the central control cooling module 10 through the fluid gravity of the cooling fluid in the cooling fluid carrying module 20, and the introduction and replacement of the cooling fluid are completed.

[0050] Finally, the central control cooling module 10 is further configured to control the disconnection of the physical connection between the central control cooling module 10 and the cooling fluid carrying module 20 after the cooling fluid in the cooling fluid carrying module 20 is completely drained, so that the cooling fluid carrying module 20 floats to the wellhead under the buoyancy of the drilling fluid after the connection is disconnected.

[0051] In an embodiment, the central control cooling module 10 is further configured to control the internal first flow port to be closed and demagnetized after the cooling fluid is introduced, so that the central control cooling module 10 is disconnected from the cooling fluid carrying module 20. In addition, the cooling fluid carrying module 20 is further configured to control the internal second flow port to be closed after the cooling fluid is introduced. Furthermore, in the embodiment of the present application, the average density of the cooling fluid carrying module 20 loaded with the cooling fluid is greater than the density of the drilling fluid in the wellbore, and the density of the drilling fluid in the wellbore is greater than the average density of the cooling fluid carrying module 20 after the cooling fluid is drained.

[0052] Specifically, after the introduction and replacement of the cooling fluid are completed, the central control cooling module 10 and the cooling fluid carrying module 20 control the internal flow ports to be closed, and then the central control cooling module is actively demagnetized. At this time, the cooling fluid carrying module 20 floats to the wellhead under the buoyancy of the drilling fluid and is recovered by the surface system.

[0053] In this way, after the central control cooling module 10 and the cooling fluid carrying module 20 are disconnected, the cooling fluid carrying module 20 without the cooling fluid can actively float to the wellhead under the buoyancy of the drilling fluid, so that the cooling fluid carrying module 20 without the cooling fluid is recovered by the surface system.

[0054] Example

[0055] The cooling control system described in the embodiment of the present application will be applied to an actual measurement-while-drilling scene, and the implementation process of the cooling control system will be described.

[0056] The temperature resistance of the MWD / LWD instrument is generally below 175℃, and the temperature resistance limit of a few instruments is 200℃, but the instruments cannot work for a long time under the limit temperature resistance condition, and the instruments are easily damaged. The instrument damage not only affects the drilling efficiency, but also causes the directional drilling, geosteering, reservoir evaluation and other work in the ultra-deep and ultra-high temperature well to be unable to continue, which greatly restricts the exploration and development of oil and gas reservoirs.

[0057] Taking a MWD instrument with temperature resistance of 200℃ as an example, before entering the well, the central control cooling module of the downhole instrument cooling control system is integrated in the MWD instrument, and the hardware circuit system of the MWD instrument is immersed in the cooling liquid of the central control cooling module; after the instrument enters the well and works, the central control cooling module cools the hardware circuit system of the instrument by controlling the migration of the internal cooling liquid, and transmits the real-time measured cooling liquid temperature and other downhole parameters to the ground through the MWD; under the double influence of the high temperature environment in the well and the instrument working heat dissipation, when the temperature of the internal cooling liquid of the central control cooling module reaches the set threshold temperature (such as 180℃), in order to improve the working safety and stability of the instrument, prolong the service life of the instrument, and ensure that the instrument continues to maintain the working ability under the super high temperature condition, the cooling liquid carrying module is put into the wellhead, and the cooling liquid carrying module runs downward along the wellbore under the action of gravity; the central control cooling module continuously sends radio frequency signals to the outside to detect the cooling liquid carrying module, when the distance between the cooling liquid carrying module and the central control cooling module reaches the detection boundary distance, the central control cooling module detects the cooling liquid carrying module, and then starts to magnetize, generates electromagnetic force on the cooling liquid carrying module, and the cooling liquid carrying module moves to the central control cooling module under the attraction of the electromagnetic force, and realizes the physical connection of the two modules; the central control cooling module opens the internal flow port of the module, guides the internal high-temperature cooling liquid out along the flow channel, and closes the flow port; the central control cooling module and the cooling liquid carrying module open the flow guide port respectively, guide the cooling liquid from the cooling liquid carrying module into the central control cooling module; after the cooling liquid is completely guided into the central control cooling module, the flow guide ports of the two modules are closed; the central control cooling module demagnetizes, and continues to control the migration of the cooling liquid through the internal electric control device, so as to cool the instrument, and the cooling liquid carrying module floats up under the action of the buoyancy of the drilling fluid and is recovered by the ground.

[0058] Based on the above downhole instrument cooling control system, the embodiment of the present application further provides a downhole instrument cooling control method for the downhole instrument cooling control system. The downhole instrument cooling control method is realized by using the downhole instrument cooling control system as described above.

[0059] Figure 3 The steps of the downhole instrument cooling control method of the embodiment of the present application are shown in the schematic diagram. As shown in Figure 3 The downhole instrument cooling control method of the embodiment of the present application includes the following steps:

[0060] Step S301, integrating the central control cooling module 10 in the downhole measuring instrument and setting the hardware circuit in the downhole measuring instrument in the cooling liquid inside the central control cooling module 10;

[0061] Step S302, informing the ground to put the cooling liquid carrying module 20 when detecting that the internal cooling liquid of the central control cooling module 10 reaches a high temperature state;

[0062] Step S303, the cooling liquid carrying module 20 is put into from the wellhead when the cooling liquid in the central control cooling module 10 reaches a high temperature state;

[0063] Step S304, the central control cooling module 10 controls to realize physical connection between itself and the cooling liquid carrying module 20 when detecting that the cooling liquid carrying module 20 reaches;

[0064] Step S305, the cooling liquid carrying module 20 guides the carried cooling liquid into the central control cooling module 10.

[0065] The application discloses a downhole instrument cooling control system and method. The system and method comprise a modular architecture and an operation control process of the downhole instrument cooling control system. Under the current technical level of hardware circuit structure and temperature resistance of electronic components, after the temperature resistance of the instrument hardware circuit system reaches the design limit, the control system and method for downhole instrument cooling provided by the application can cool the instrument working in the well, further improve the temperature resistance, working safety and stability of the instrument under super-high temperature conditions, prolong the service life of the instrument, ensure that the instrument continues to maintain working ability under super-high temperature conditions, meet the application requirements of super-deep and super-high temperature drilling, and improve the drilling efficiency.

[0066] The above merely describes a preferred embodiment of the application, but the protection scope of the application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the application, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

[0067] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for description purposes and cannot be understood as indicating or implying relative importance.

[0068] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0069] It is to be understood that the embodiments disclosed herein are not limited to particular structures, processes, or materials disclosed herein but rather, the embodiments disclosed herein extend to all equivalent structures, processes, and materials, as would be recognized by those of ordinary skill in the relevant art. It will also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0070] Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. Thus, appearances of the phrases "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

[0071] Although the present application has been disclosed in connection with the embodiments shown and described above, it should be understood that the application is not limited to the embodiments disclosed but rather, can be practiced with modification and alteration within the scope of the appended claims. Accordingly, the application is not limited to the embodiments described herein, but can be practiced with modification and alteration within the scope of the appended claims.

Claims

1. A downhole instrument temperature reduction control system, comprising: The downhole instrument cooling control system meets the application requirements of ultra-deep drilling, comprising: a cooling liquid carrying module for being put into from the wellhead when the cooling liquid in the central control cooling module reaches a high temperature state, and for guiding the carried cooling liquid into the central control cooling module after realizing physical connection with the central control cooling module; the central control cooling module is integrated in the downhole measuring instrument and immerses the hardware circuit in the downhole measuring instrument in the cooling liquid stored in the cooling space inside the central control cooling module, and is used for controlling realization of physical connection between itself and the cooling liquid carrying module when the cooling liquid carrying module is detected to reach, wherein a high-temperature cooling liquid storage tank is arranged below the cooling space, and after realizing physical connection of the central control cooling module and the cooling liquid carrying module, the high-temperature cooling liquid in the cooling space is discharged into the high-temperature cooling liquid storage tank when the cooling liquid in the internal cooling space is detected to reach a high temperature state, and the ground is informed to put the cooling liquid carrying module; the central control cooling module is also used for controlling disconnection of the physical connection between itself and the cooling liquid carrying module after the cooling liquid of the cooling liquid carrying module is completely guided out, so that the cooling liquid carrying module floats to the wellhead by the buoyancy of the drilling fluid, wherein the average density of the cooling liquid carrying module loaded with the cooling liquid is greater than the density of the drilling fluid, and the density of the drilling fluid is greater than the average density of the cooling liquid carrying module after the cooling liquid is guided out; the downhole measuring instrument is used for detecting the cooling liquid temperature of the cooling space in the central control cooling module in real time, and informing the ground when the real-time cooling liquid temperature reaches or is higher than a preset temperature threshold, so that the ground system controls putting of the cooling liquid carrying module, otherwise the cooling liquid in the cooling space is continuously used to cool and lower the temperature of the hardware circuit of the downhole measuring instrument.

2. The downhole instrument temperature control system of claim 1, wherein, By transmitting the abnormal temperature value of the cooling liquid or the putting instruction signal to the ground, and receiving by the ground system, so that the ground system controls putting of the cooling liquid carrying module.

3. The downhole instrument cooling control system according to claim 1 or 2, wherein the central control cooling module is also used for detecting the position of the cooling liquid carrying module in real time, magnetizing when the cooling liquid carrying module is detected to move to the detection boundary of the central control cooling module, and emitting electromagnetic force to the cooling liquid carrying module to realize physical connection of the cooling liquid carrying module and the central control cooling module.

4. The downhole instrument cooling control system according to claim 3, wherein the central control cooling module is also used for controlling opening of the internal flow guide port and facing the flow guide port in the cooling liquid carrying module after realizing physical connection with the cooling liquid carrying module, and the cooling liquid carrying module is also used for controlling opening of the internal flow guide port after realizing physical connection with the central control cooling module, so as to realize conduction of the internal spaces of the two modules.

5. The downhole instrument temperature control system of claim 4, wherein, Before the flow guide ports are docked, the central control cooling module is also used for discharging the cooling liquid in the internal high-temperature state into the internal high-temperature cooling liquid storage tank.

6. The downhole instrument cooling control system of claim 3, wherein the central control cooling module is further configured to control the internal flow port to close and demagnetize after the cooling fluid is guided, and to break the physical connection between the central control cooling module and the cooling fluid carrier module.

7. The downhole instrument cooling control system of claim 6, wherein the cooling fluid carrier module is further configured to control the internal flow port to close after the cooling fluid is guided.

8. The downhole instrument cooling control system of claim 7, wherein the downhole measuring instrument is an MWD instrument or an EM-MWD instrument or an LWD instrument.

7. The downhole instrument temperature control system of claims 1 or 2, wherein, 9. The downhole instrument cooling control method of any one of claims 1-8, wherein the downhole instrument cooling control method comprises:

8. A method of temperature control for downhole instruments, comprising: integrating the central control cooling module into the downhole measuring instrument and setting the hardware circuit in the downhole measuring instrument inside the cooling fluid in the central control cooling module; notifying the surface to launch the cooling fluid carrier module when the cooling fluid inside the central control cooling module is detected to reach a high temperature state; launching the cooling fluid carrier module from the wellhead when the cooling fluid inside the central control cooling module reaches a high temperature state; controlling the central control cooling module to achieve physical connection with the cooling fluid carrier module when the cooling fluid carrier module is detected to reach; guiding the carried cooling fluid into the central control cooling module by the cooling fluid carrier module.

10. The downhole instrument cooling control method of claim 9, wherein the downhole measuring instrument is an MWD instrument or an EM-MWD instrument or an LWD instrument.

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