Well drilling gas cut early warning method and device based on dynamic monitoring of underground temperature field

Abstract

The invention provides a well drilling gas cut early warning method and device based on underground temperature field dynamic monitoring. The method comprises the steps that real-time temperature data collected by the inner side and the outer side of a drill rod close to the well bottom or the outer side of a drill rod close to the well bottom and at different depths are obtained; according to the real-time temperature data, a temperature instantaneous value is obtained by comparing the temperature difference of the inner and outer measuring points of the drill rod or the temperature difference of the upper and lower annulus, and the corresponding heat conductivity is obtained through analysis according to the temperature instantaneous value; and triggering well drilling gas cut risk early warning through the heat conductivity and a preset analysis strategy. Therefore, on the basis that implementation is easy and monitoring equipment is stable in a high-temperature environment, reliability and sensitivity of gas cut monitoring are improved, early warning time can be shortened, and well control risks can be greatly reduced.

Description

Technical Field

[0001] The present application relates to the field of oil and gas development, and in particular to a drilling gas intrusion early warning method and device based on dynamic monitoring of downhole temperature fields. Background Art

[0002] Gas intrusion is one of the main causes of blowouts, leading to pressure imbalances within the wellbore, which can cause overflows, kicks, and even blowouts. These accidents pose a serious threat to drilling safety and cause economic losses and environmental pollution. Therefore, early detection of gas intrusion is crucial for ensuring well control safety. In recent years, as drilling depths have continued to increase, gas intrusion monitoring in deep, ultra-deep, and high-temperature, high-pressure wells has become a research frontier. However, the difficulty of gas intrusion monitoring is increasing. Most gas intrusion monitoring methods previously suitable for conventional wells are no longer applicable in deep, high-temperature, and high-pressure wells. These methods suffer from low monitoring accuracy, high latency, high false alarm rates, and the inability to correctly identify gas intrusion, leading to equipment failure.

[0003] Existing technologies have significant limitations: monitoring devices based on pressure chamber structures face the risk of equipment failure in high-temperature, high-pressure wells, and their multi-chamber mechanical structure experiences a sharp drop in reliability under extreme operating conditions near the bottom of the wellbore. Monitoring methods based on the propagation characteristics of acoustic waves have difficulty identifying gaseous components dissolved in oil-based drilling fluids and suffer from severe signal attenuation. Both technologies face technical bottlenecks such as long monitoring delays and high false alarm rates in high-temperature, high-pressure deep well scenarios. Summary of the Invention

[0004] The purpose of this application is to provide a drilling gas intrusion early warning method and device based on dynamic monitoring of the downhole temperature field. The change in the downhole temperature field is used to judge the change in the heat transfer efficiency of the flow medium, thereby inferring whether gas intrusion has occurred. This improves the reliability and sensitivity of gas intrusion monitoring on the basis of easy implementation and stability of the monitoring equipment in a high-temperature environment, shortens the early warning time, and significantly reduces the well control risk.

[0005] To achieve the above-mentioned purpose, the present application provides a drilling gas intrusion early warning method based on dynamic monitoring of the downhole temperature field, which specifically includes: obtaining real-time temperature data collected from the inside and outside of the drill pipe near the bottom of the well or the outside of the drill pipe at different depths near the bottom of the well; obtaining an instantaneous temperature value by comparing the temperature difference between the measuring points inside and outside the drill pipe or the temperature difference between the upper and lower parts of the annulus based on the real-time temperature data, and obtaining the corresponding thermal conductivity based on the instantaneous temperature value; triggering a drilling gas intrusion risk early warning through the thermal conductivity and a preset analysis strategy.

[0006] In the above-mentioned drilling gas invasion early warning method based on dynamic monitoring of the downhole temperature field, optionally, triggering the drilling gas invasion risk early warning through the thermal conductivity and the preset analysis strategy includes: triggering the drilling gas invasion risk early warning when an abnormal value appears in the thermal conductivity or the thermal conductivity is continuously higher than a preset threshold for a preset period.

[0007] In the above-mentioned drilling gas intrusion early warning method based on dynamic monitoring of the downhole temperature field, optionally, obtaining the corresponding thermal conductivity according to the instantaneous temperature value analysis includes:

[0008] The thermal conductivity of the overflow-drilling fluid mixture is calculated using the following formula:

[0009]

[0010] Among them, k eff is the effective thermal conductivity of the mixture; k liq is the thermal conductivity of drilling fluid; k gas is the thermal conductivity of natural gas; φ is the mass fraction of natural gas.

[0011] In the above-mentioned drilling gas intrusion early warning method based on dynamic monitoring of the downhole temperature field, optionally, obtaining the corresponding thermal conductivity according to the instantaneous temperature value analysis includes: obtaining the time change rate of the temperature gradient by calculating the instantaneous temperature value; and obtaining the thermal conductivity according to the time change rate analysis.

[0012] In the above-mentioned drilling gas invasion early warning method based on dynamic monitoring of the downhole temperature field, optionally, triggering a drilling gas invasion risk early warning through the thermal conductivity and preset analysis strategy includes: when comparative monitoring of the inside and outside of the drill pipe near the bottom of the well is adopted, and the temperature difference between the outside temperature and the inside temperature of the drill pipe decreases due to a non-geothermal gradient, triggering a drilling gas invasion risk early warning; when multi-point monitoring of the outside of the drill pipe near the bottom of the well is adopted, and a decrease in the temperature difference between the temperature measuring points from bottom to top in the annulus is detected due to a non-geothermal gradient, triggering a drilling gas invasion risk early warning.

[0013] In the above-mentioned drilling gas invasion early warning method based on dynamic monitoring of the downhole temperature field, optionally, triggering a drilling gas invasion risk early warning through the thermal conductivity and a preset analysis strategy includes: when adopting multi-point monitoring on the outside of the drill pipe near the bottom of the well, determining the overflow upward position and the duration of the gas invasion by monitoring the temperature difference between each temperature measuring point, and triggering a drilling gas invasion risk early warning according to the overflow upward position and the duration of the gas invasion.

[0014] The present application also provides a drilling gas intrusion warning device based on dynamic monitoring of the downhole temperature field, the device comprising a temperature sensor group, a data processing module and a gas intrusion warning module; the temperature sensor group comprises a plurality of temperature sensors, the temperature sensors being arranged on the inside and outside of the drill pipe near the bottom of the well or on the outside of the drill pipe at different depths near the bottom of the well, for collecting real-time temperature data of the corresponding areas; the data processing module is used to obtain an instantaneous temperature value by comparing the temperature difference between the measuring points inside and outside the drill pipe or the temperature difference between the upper and lower annuli according to the real-time temperature data, and to obtain the corresponding thermal conductivity according to the analysis of the instantaneous temperature value; the gas intrusion warning module is used to trigger a drilling gas intrusion risk warning through the thermal conductivity and a preset analysis strategy.

[0015] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0016] The present application also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0017] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0018] The beneficial technical effects of the present application are: it is easy to obtain, technically mature, and highly stable, and has good applicability to high-temperature and high-pressure environments near the bottom of deep wells, ultra-deep wells, and high-temperature and high-pressure wells; in high-temperature and high-pressure bottom-hole environments such as high-temperature and high-pressure wells, highly deviated wells, and horizontal wells, or under conditions where oil-based drilling fluid is used, the overflow gas is severely compressed and may be dissolved in the drilling fluid. At this time, most gas intrusion monitoring methods are no longer applicable. Under the above-mentioned complex near-bottom-hole conditions, the method used in the present application to monitor gas intrusion by the heat transfer efficiency of the gas-liquid mixture can be well applied to this complex environment, and can identify small-volume gas intrusion dissolved in the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present application, constitute a part of the present application, and do not constitute a limitation of the present application. In the drawings:

[0020] Figure 1 A flow chart of a drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field provided in one embodiment of the present application;

[0021] Figure 2 A schematic diagram of the internal and external monitoring structure provided in one embodiment of the present application;

[0022] Figure 3 A schematic diagram of a two-point external monitoring structure provided in an embodiment of the present application;

[0023] Figure 4 A schematic diagram of a multi-point monitoring structure provided in an embodiment of the present application;

[0024] Figure 5 A schematic structural diagram of a drilling gas intrusion warning device based on dynamic monitoring of downhole temperature fields provided in one embodiment of the present application;

[0025] Figure 6 A schematic diagram of the structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0026] The following will describe in detail the implementation methods of this application in conjunction with the accompanying drawings and examples, so that the application can fully understand how technical means are used to solve technical problems and achieve technical effects, and implement them accordingly. It should be noted that as long as there is no conflict, the various embodiments and the various features in each embodiment of this application can be combined with each other, and the resulting technical solutions are all within the scope of protection of this application.

[0027] Additionally, the steps shown in the flowcharts of the accompanying drawings may be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown.

[0028] Please refer to Figure 1 As shown, the present application provides a drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field, which specifically includes:

[0029] S101: Acquire real-time temperature data collected from the inside and outside of the drill pipe near the bottom of the well or from the outside of the drill pipe at different depths near the bottom of the well;

[0030] S102: Obtaining an instantaneous temperature value by comparing the temperature difference between the inner and outer measuring points of the drill pipe or the upper and lower temperature differences of the annulus according to the real-time temperature data, and obtaining a corresponding thermal conductivity according to the instantaneous temperature value;

[0031] S103: triggering a drilling gas invasion risk warning based on the thermal conductivity and a preset analysis strategy.

[0032] Among them, obtaining the corresponding thermal conductivity based on the instantaneous temperature value analysis includes: calculating the time rate of change of the temperature gradient through the instantaneous temperature value; obtaining thermal conductivity based on the time rate of change analysis; in actual work, after obtaining real-time temperature data, this application can also perform preprocessing on it for special scenarios to eliminate unnecessary influences; the analysis of this thermal conductivity is mainly based on the fact that the thermal conductivity of the overflow gas is much lower than the thermal conductivity of the drilling fluid. After the gas invasion, the overflow-drilling fluid mixture at the bottom of the well changes the thermal conductivity efficiency of the flow medium between the bottom hole formation and the near-bottom hole drill pipe; thus, by analyzing the thermal conductivity (such as the above-mentioned liquid thermal conductivity), the relevant gas invasion risk can be determined. The specific implementation logic of each step will be described in detail in the subsequent embodiments and will not be described in detail here.

[0033] In one embodiment of the present application, triggering a drilling gas invasion risk warning using the thermal conductivity and a preset analysis strategy includes: triggering a drilling gas invasion risk warning when an abnormal value appears in the thermal conductivity or the thermal conductivity is continuously higher than a preset threshold value for a preset period. In another embodiment of the present application, triggering a drilling gas invasion risk warning using the thermal conductivity and a preset analysis strategy includes: triggering a drilling gas invasion risk warning when comparative monitoring of the inside and outside of the drill pipe near the bottom of the well is performed, and a decrease in the temperature difference between the outside and inside temperatures of the drill pipe is not caused by a geothermal gradient; triggering a drilling gas invasion risk warning when multi-point monitoring of the outside of the drill pipe near the bottom of the well is performed, and a decrease in the temperature difference between the temperature measuring points from bottom to top in the annulus is not caused by a geothermal gradient is detected.

[0034] Wherein, obtaining the corresponding thermal conductivity according to the instantaneous temperature value analysis includes: calculating the thermal conductivity of the overflow-drilling fluid mixture by the following formula:

[0035]

[0036] Among them, k eff is the effective thermal conductivity of the mixture; k liq is the thermal conductivity of drilling fluid; k gas is the thermal conductivity of natural gas; φ is the mass fraction of natural gas.

[0037] In the above embodiment, when analyzing the thermal conductivity to judge the gas intrusion process, an analysis strategy can be introduced, that is, the different gas intrusion risk warning methods adopted according to the measurement point location; for details, please refer to Figure 2 As shown, when the temperature difference between the temperature point B on the outside of the drill pipe and the temperature point A on the inside of the drill pipe decreases due to a non-geothermal gradient, it is determined that there is gas intrusion. The analysis of the influence of the geothermal gradient in this process will be described in detail in the subsequent examples. Figure 3 As shown, when temperature sensors are arranged at multiple different depths outside the drill pipe, when the temperature difference between the lower end temperature point B and the upper end temperature point A decreases due to a non-geothermal gradient, it is determined that gas intrusion exists.

[0038] In one embodiment of the present application, triggering a drilling gas invasion risk warning by using the thermal conductivity and a preset analysis strategy includes: when using multi-point monitoring outside the drill pipe near the bottom of the well, determining the overflow upward position and the duration of the gas invasion by monitoring the temperature difference between each temperature measurement point, and triggering a drilling gas invasion risk warning based on the overflow upward position and the duration of the gas invasion. For details, please refer to Figure 4As shown, when temperature measurement points are arranged at multiple points A, B, C, D, and E on the outside of the drill pipe near the bottom of the well, the upward position of the overflow and whether gas intrusion is ongoing can be determined based on the trend of temperature difference changes. For example, if E is greater than D, greater than C, greater than B, and greater than A, of course, during this process, if E is greater than C, greater than A, and D or B is abnormal, gas intrusion can also be determined based on this trend. The specific setting logic can be selected and set according to actual needs and is not further limited in this application.

[0039] In high-temperature and high-pressure bottomhole environments such as high-temperature and high-pressure wells, highly deviated wells, and horizontal wells, or when using oil-based drilling fluids, overflowing gas is severely compressed and may dissolve in the drilling fluid. In this case, most gas intrusion monitoring methods are no longer applicable. Therefore, the above embodiment can be used to monitor gas intrusion by using the heat transfer efficiency of the gas-liquid mixture in complex near-bottomhole conditions. This method is well suited for such complex environments and can identify small-volume gas intrusion dissolved in the drilling fluid.

[0040] In order to facilitate a clearer understanding of the application of the drilling gas intrusion warning method based on dynamic monitoring of the downhole temperature field provided in this application, the above method will be illustrated by multiple embodiments below. Relevant technical personnel in this field should know that this example is only for the convenience of understanding the above scheme and does not impose any limitation on it.

[0041] In one embodiment, distributed fiber optic temperature sensors can be placed on the outside of the drill pipe at a spacing of 0.5 meters and a sampling frequency of 5 Hz to simultaneously acquire the basic thermal conductivity of the drilling fluid, λ_mud (experimentally calibrated), and the thermal conductivity of natural gas, λ_gas (preset at 0.03 W / (m·K)). During implementation, a real-time temperature sequence is first acquired, and the temperature difference between adjacent measuring points, ΔT_obs, is calculated. This is then applied to the mixed thermal conductivity formula to obtain the thermal conductivity. This thermal conductivity is then used to detect outliers and continuously monitor for excess values, thereby determining whether to trigger instantaneous warnings and high-pressure gas intrusion warnings. This allows the mixed thermal conductivity model to directly quantify the gas content, covering both the dissolved and free phases during the early stages of gas intrusion.

[0042] In another embodiment of the present application, thermocouple arrays can be symmetrically installed on the inside and outside of the drill pipe (two groups on the inside and four groups on the outside), with a data refresh rate of 1Hz. During implementation, the temperature difference between the inside and outside is first calculated and the influence of the geothermal gradient is eliminated to complete the temperature difference correction. Subsequently, the time derivative of the temperature gradient is calculated to complete the rate of change analysis. Then, the thermal conductivity is mapped to determine whether the thermal conductivity has dropped abnormally, thereby providing a gas intrusion warning. Furthermore, during the gas intrusion warning process, both a first-level warning and a second-level warning can be used. In the first-level warning, a manual review is prompted; in the second-level warning, the blowout preventer is automatically closed. Thus, transient gas intrusion events are captured through the dynamic rate of change, and the response speed is improved to seconds.

[0043] In one embodiment of the present application, a three-layer annular sensor array (8 measuring points per layer, 1 meter interlayer spacing) can be installed on the outside of the drill pipe to form a three-dimensional monitoring network. During the implementation process, the abnormal area is first located, the maximum temperature difference between the measuring points in each layer is calculated, and when a layer is less than 50% of the adjacent layer, it is marked as a gas invasion affected layer; in terms of duration judgment, the number of layers N that the gas invasion affected layer migrates upward can be counted, as well as the gas invasion speed v = N·interlayer spacing / sampling period. In terms of early warning strategy, when v>0.2m / s and lasts for 1 minute, a well kick warning is triggered. When the alarm continues for more than 3 minutes in the same layer, it is determined to be a local gas accumulation, and throttling and well pressure are started. Thus, the three-dimensional temperature field analysis realizes the visualization of the gas invasion migration path and supports accurate well control decision-making.

[0044] In one embodiment of the present application, a dual-mode sensor layout (mode one: inside and outside comparison; mode two: annular multi-point monitoring) can also be used, which automatically switches according to the type of formation. During implementation, mode one (inside and outside): calculates the theoretical geothermal temperature difference. When the actual measured value is less than the preset ratio of the theoretical geothermal temperature difference, it is determined that gas invasion has caused an insulation effect; mode two (annular multi-point): calculates the vertical temperature gradient of the annulus. When the actual measured value is less than the preset ratio of the theoretical value of the geothermal gradient, a gas invasion warning is triggered. Finally, if the dual modes alarm at the same time, the confidence level is 100%, and if the single mode alarm is triggered, the mud gas detection review is initiated; thus, the dual verification mechanism avoids false alarms and adapts to complex geological conditions.

[0045] In view of the fact that in actual work, personnel in this field can choose more implementation methods according to actual needs, this application will not describe them in detail one by one; of course, in actual work, the above-mentioned specific parameters and calculation logic can also be selected and set according to actual needs, and this application does not make further limitations here.

[0046] Please refer to Figure 5 As shown, the present application also provides a drilling gas intrusion warning device based on dynamic monitoring of the downhole temperature field, the device comprising a temperature sensor group, a data processing module and a gas intrusion warning module; the temperature sensor group comprises a plurality of temperature sensors, and the temperature sensors are respectively arranged on the inside and outside of the drill pipe near the bottom of the well or on the outside of the drill pipe at different depths near the bottom of the well, for collecting real-time temperature data of the corresponding area; the data processing module is used to obtain the instantaneous temperature value by comparing the temperature difference between the measuring points inside and outside the drill pipe or the temperature difference between the upper and lower parts of the annulus according to the real-time temperature data, and obtain the corresponding thermal conductivity according to the analysis of the instantaneous temperature value; the gas intrusion warning module is used to trigger the drilling gas intrusion risk warning through the thermal conductivity and the preset analysis strategy.

[0047] Since the principle of solving the problem by this device is similar to the drilling gas invasion early warning method based on dynamic monitoring of the downhole temperature field, the implementation of this device can refer to the implementation of the drilling gas invasion early warning method based on dynamic monitoring of the downhole temperature field, and the repeated parts will not be repeated.

[0048] The beneficial technical effects of the present application are: it is easy to obtain, technically mature, and highly stable, and has good applicability to high-temperature and high-pressure environments near the bottom of deep wells, ultra-deep wells, and high-temperature and high-pressure wells; in high-temperature and high-pressure bottom-hole environments such as high-temperature and high-pressure wells, highly deviated wells, and horizontal wells, or under conditions where oil-based drilling fluid is used, the overflow gas is severely compressed and may be dissolved in the drilling fluid. At this time, most gas intrusion monitoring methods are no longer applicable. Under the above-mentioned complex near-bottom-hole conditions, the method used in the present application to monitor gas intrusion by the heat transfer efficiency of the gas-liquid mixture can be well applied to this complex environment, and can identify small-volume gas intrusion dissolved in the drilling fluid.

[0049] The present application also provides an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the above-mentioned method when executing the computer program.

[0050] The present application also provides a computer-readable storage medium, which stores a computer program for executing the above method.

[0051] The present application also provides a computer program product, comprising a computer program / instruction, which implements the steps of the above method when executed by a processor.

[0052] like Figure 6 As shown, the electronic device 600 may further include: a communication module 110, an input unit 120, an audio processor 130, a display 160, and a power supply 170. It is worth noting that the electronic device 600 does not necessarily have to include Figure 6 In addition, the electronic device 600 may also include all components shown in Figure 6 For components not shown, reference may be made to the prior art.

[0053] like Figure 6 As shown, the central processing unit 100 is sometimes also referred to as a controller or an operation control unit, and may include a microprocessor or other processor device and / or logic device. The central processing unit 100 receives inputs and controls the operations of various components of the electronic device 600 .

[0054] Memory 140 may be, for example, one or more of a cache, flash memory, hard drive, removable media, volatile memory, non-volatile memory, or other suitable devices. It may store the aforementioned failure-related information and may also store programs that execute the relevant information. The CPU 100 may execute the programs stored in memory 140 to implement information storage or processing.

[0055] The input unit 120 provides input to the CPU 100. The input unit 120 may be, for example, a keypad or touch input device. The power supply 170 is used to provide power to the electronic device 600. The display 160 is used to display objects such as images and text. The display may be, for example, an LCD display, but is not limited thereto.

[0056] The memory 140 may be a solid-state memory, such as a read-only memory (ROM), a random access memory (RAM), or a SIM card. Alternatively, it may be a memory that retains information even when power is off, can be selectively erased, and is provided with more data. Examples of such memory are sometimes referred to as EPROMs. The memory 140 may also be some other type of device. The memory 140 includes a buffer memory 141 (sometimes referred to as a buffer). The memory 140 may include an application / function storage unit 142 for storing application programs and function programs or processes for executing the operations of the electronic device 600 via the central processing unit 100.

[0057] The memory 140 may also include a data storage unit (data 143) for storing data, such as contacts, digital data, pictures, sounds, and / or any other data used by the electronic device. The driver storage unit (driver 144) of the memory 140 may include various driver programs for communication functions of the electronic device and / or for executing other functions of the electronic device (such as messaging applications, address book applications, etc.).

[0058] The communication module 110 is a transmitter / receiver 110 that transmits and receives signals via an antenna 111. The communication module (transmitter / receiver) 110 is coupled to the central processor 100 to provide input signals and receive output signals, which may be the same as in a conventional mobile communication terminal.

[0059] Based on different communication technologies, multiple communication modules 110 may be provided in the same electronic device, such as a cellular network module, a Bluetooth module, and / or a wireless local area network module. The communication module (transmitter / receiver) 110 is also coupled to a speaker 131 and a microphone 132 via an audio processor 130 to provide audio output via the speaker 131 and receive audio input from the microphone 132, thereby implementing common telecommunication functions. The audio processor 130 may include any suitable buffer, decoder, amplifier, etc. Furthermore, the audio processor 130 is also coupled to the central processing unit 100, enabling local recording via the microphone 132 and playback of stored audio via the speaker 131.

[0060] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0061] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0062] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0063] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0064] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present application. It should be understood that the above description is only a specific embodiment of the present application and is not intended to limit the scope of protection of the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field, characterized in that: The method comprises: Acquire real-time temperature data collected from the inside and outside of the drill pipe near the bottom of the well or from the outside of the drill pipe at different depths near the bottom of the well; Obtaining an instantaneous temperature value by comparing the temperature difference between the inner and outer measuring points of the drill pipe or the upper and lower temperature differences of the annulus according to the real-time temperature data, and obtaining a corresponding thermal conductivity according to the instantaneous temperature value analysis; The thermal conductivity and the preset analysis strategy are used to trigger a drilling gas invasion risk warning.

2. The drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field according to claim 1 is characterized in that: The triggering of drilling gas invasion risk warning by the thermal conductivity and preset analysis strategy includes: When an abnormal value appears in the thermal conductivity or the thermal conductivity is continuously higher than a preset threshold for a preset period, a drilling gas invasion risk warning is triggered.

3. The drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field according to claim 1 is characterized in that: Obtaining the corresponding thermal conductivity according to the instantaneous temperature value analysis includes: The thermal conductivity of the overflow-drilling fluid mixture is calculated using the following formula: Among them, k eff is the effective thermal conductivity of the mixture; k liq is the thermal conductivity of drilling fluid; k gas is the thermal conductivity of natural gas; φ is the mass fraction of natural gas.

4. The drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field according to claim 1 is characterized in that: Obtaining the corresponding thermal conductivity according to the instantaneous temperature value analysis includes: Calculating the time rate of change of the temperature gradient by the instantaneous temperature value; The thermal conductivity is obtained based on the time rate of change analysis.

5. The drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field according to claim 4 is characterized in that: The triggering of drilling gas invasion risk warning by the thermal conductivity and preset analysis strategy includes: When the inside and outside of the drill pipe near the bottom of the well are compared and the temperature difference between the outside and inside of the drill pipe decreases due to factors other than geothermal gradient, a drilling gas invasion risk warning is triggered. When multi-point monitoring is used on the outside of the drill pipe near the bottom of the well, and the temperature difference between the temperature measuring points from bottom to top in the annulus is detected to decrease due to a non-geothermal gradient, a drilling gas invasion risk warning is triggered.

6. The drilling gas intrusion early warning method based on dynamic monitoring of downhole temperature field according to claim 4 is characterized in that: The triggering of drilling gas invasion risk warning by the thermal conductivity and preset analysis strategy includes: When multi-point monitoring is adopted on the outside of the drill pipe near the bottom of the well, the overflow upward movement position and the gas invasion duration are determined by monitoring the temperature difference between each temperature measuring point, and a drilling gas invasion risk warning is triggered according to the overflow upward movement position and the gas invasion duration.

7. A drilling gas intrusion early warning device based on dynamic monitoring of downhole temperature field, characterized in that: The device comprises a temperature sensor group, a data processing module and a gas intrusion warning module; The temperature sensor group includes multiple temperature sensors, which are respectively arranged inside and outside the drill pipe near the bottom of the well or outside the drill pipe at different depths near the bottom of the well to collect real-time temperature data of the corresponding area; The data processing module is used to obtain an instantaneous temperature value by comparing the temperature difference between the inner and outer measuring points of the drill pipe or the temperature difference between the upper and lower temperature points of the annulus according to the real-time temperature data, and to obtain the corresponding thermal conductivity according to the analysis of the instantaneous temperature value; The gas invasion warning module is used to trigger a drilling gas invasion risk warning based on the thermal conductivity and a preset analysis strategy.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product comprising a computer program / instructions, characterized in that When the computer program / instructions are executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.

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